property.c

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%            PPPP    RRRR    OOO   PPPP   EEEEE  RRRR   TTTTT  Y   Y          %
%            P   P   R   R  O   O  P   P  E      R   R    T     Y Y           %
%            PPPP    RRRR   O   O  PPPP   EEE    RRRR     T      Y            %
%            P       R R    O   O  P      E      R R      T      Y            %
%            P       R  R    OOO   P      EEEEE  R  R     T      Y            %
%                                                                             %
%                                                                             %
%                         MagickCore Property Methods                         %
%                                                                             %
%                              Software Design                                %
%                                   Cristy                                    %
%                                 March 2000                                  %
%                                                                             %
%                                                                             %
%  Copyright 1999 ImageMagick Studio LLC, a non-profit organization           %
%  dedicated to making software imaging solutions freely available.           %
%                                                                             %
%  You may not use this file except in compliance with the License.  You may  %
%  obtain a copy of the License at                                            %
%                                                                             %
%    https://imagemagick.org/script/license.php                               %
%                                                                             %
%  Unless required by applicable law or agreed to in writing, software        %
%  distributed under the License is distributed on an "AS IS" BASIS,          %
%  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
%  See the License for the specific language governing permissions and        %
%  limitations under the License.                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%
%
*/
 
/*
  Include declarations.
*/
#include "magick/studio.h"
#include "magick/artifact.h"
#include "magick/attribute.h"
#include "magick/cache.h"
#include "magick/cache-private.h"
#include "magick/color.h"
#include "magick/colorspace-private.h"
#include "magick/compare.h"
#include "magick/constitute.h"
#include "magick/draw.h"
#include "magick/effect.h"
#include "magick/exception.h"
#include "magick/exception-private.h"
#include "magick/fx.h"
#include "magick/fx-private.h"
#include "magick/gem.h"
#include "magick/geometry.h"
#include "magick/histogram.h"
#include "magick/image.h"
#include "magick/image.h"
#include "magick/layer.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/monitor.h"
#include "magick/montage.h"
#include "magick/option.h"
#include "magick/policy.h"
#include "magick/profile.h"
#include "magick/property.h"
#include "magick/quantum.h"
#include "magick/resource_.h"
#include "magick/splay-tree.h"
#include "magick/signature-private.h"
#include "magick/statistic.h"
#include "magick/string_.h"
#include "magick/string-private.h"
#include "magick/token.h"
#include "magick/utility.h"
#include "magick/version.h"
#include "magick/xml-tree.h"
#if defined(MAGICKCORE_LCMS_DELEGATE)
#if defined(MAGICKCORE_HAVE_LCMS2_LCMS2_H)
#include <lcms2/lcms2.h>
#elif defined(MAGICKCORE_HAVE_LCMS2_H)
#include "lcms2.h"
#elif defined(MAGICKCORE_HAVE_LCMS_LCMS_H)
#include <lcms/lcms.h>
#else
#include "lcms.h"
#endif
#endif
␌
/*
  Define declarations.
*/
#if defined(MAGICKCORE_LCMS_DELEGATE)
#if defined(LCMS_VERSION) && (LCMS_VERSION < 2000)
#define cmsUInt32Number  DWORD
#endif
#endif
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   C l o n e I m a g e P r o p e r t i e s                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  CloneImageProperties() clones all the image properties to another image.
%
%  The format of the CloneImageProperties method is:
%
%      MagickBooleanType CloneImageProperties(Image *image,
%        const Image *clone_image)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o clone_image: the clone image.
%
*/
MagickExport MagickBooleanType CloneImageProperties(Image *image,
  const Image *clone_image)
{
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  assert(clone_image != (const Image *) NULL);
  assert(clone_image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    {
      (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
      (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
        clone_image->filename);
    }
  (void) CopyMagickString(image->filename,clone_image->filename,MaxTextExtent);
  (void) CopyMagickString(image->magick_filename,clone_image->magick_filename,
    MaxTextExtent);
  image->compression=clone_image->compression;
  image->quality=clone_image->quality;
  image->depth=clone_image->depth;
  image->background_color=clone_image->background_color;
  image->border_color=clone_image->border_color;
  image->matte_color=clone_image->matte_color;
  image->transparent_color=clone_image->transparent_color;
  image->gamma=clone_image->gamma;
  image->chromaticity=clone_image->chromaticity;
  image->rendering_intent=clone_image->rendering_intent;
  image->black_point_compensation=clone_image->black_point_compensation;
  image->units=clone_image->units;
  image->montage=(char *) NULL;
  image->directory=(char *) NULL;
  (void) CloneString(&image->geometry,clone_image->geometry);
  image->offset=clone_image->offset;
  image->x_resolution=clone_image->x_resolution;
  image->y_resolution=clone_image->y_resolution;
  image->page=clone_image->page;
  image->tile_offset=clone_image->tile_offset;
  image->extract_info=clone_image->extract_info;
  image->bias=clone_image->bias;
  image->filter=clone_image->filter;
  image->blur=clone_image->blur;
  image->fuzz=clone_image->fuzz;
  image->intensity=clone_image->intensity;
  image->interlace=clone_image->interlace;
  image->interpolate=clone_image->interpolate;
  image->endian=clone_image->endian;
  image->gravity=clone_image->gravity;
  image->compose=clone_image->compose;
  image->orientation=clone_image->orientation;
  image->scene=clone_image->scene;
  image->dispose=clone_image->dispose;
  image->delay=clone_image->delay;
  image->ticks_per_second=clone_image->ticks_per_second;
  image->iterations=clone_image->iterations;
  image->total_colors=clone_image->total_colors;
  image->taint=clone_image->taint;
  image->progress_monitor=clone_image->progress_monitor;
  image->client_data=clone_image->client_data;
  image->start_loop=clone_image->start_loop;
  image->error=clone_image->error;
  image->signature=clone_image->signature;
  if (clone_image->properties != (void *) NULL)
    {
      if (image->properties != (void *) NULL)
        DestroyImageProperties(image);
      image->properties=CloneSplayTree((SplayTreeInfo *)
        clone_image->properties,(void *(*)(void *)) ConstantString,
        (void *(*)(void *)) ConstantString);
    }
  return(MagickTrue);
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   D e f i n e I m a g e P r o p e r t y                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  DefineImageProperty() associates an assignment string of the form
%  "key=value" with an artifact or options. It is equivalent to
%  SetImageProperty().
%
%  The format of the DefineImageProperty method is:
%
%      MagickBooleanType DefineImageProperty(Image *image,
%        const char *property)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o property: the image property.
%
*/
MagickExport MagickBooleanType DefineImageProperty(Image *image,
  const char *property)
{
  char
    key[MaxTextExtent],
    value[MaxTextExtent];
 
  char
    *p;
 
  assert(image != (Image *) NULL);
  assert(property != (const char *) NULL);
  (void) CopyMagickString(key,property,MaxTextExtent-1);
  for (p=key; *p != '\0'; p++)
    if (*p == '=')
      break;
  *value='\0';
  if (*p == '=')
    (void) CopyMagickString(value,p+1,MaxTextExtent);
  *p='\0';
  return(SetImageProperty(image,key,value));
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   D e l e t e I m a g e P r o p e r t y                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  DeleteImageProperty() deletes an image property.
%
%  The format of the DeleteImageProperty method is:
%
%      MagickBooleanType DeleteImageProperty(Image *image,const char *property)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o property: the image property.
%
*/
MagickExport MagickBooleanType DeleteImageProperty(Image *image,
  const char *property)
{
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  if (image->properties == (void *) NULL)
    return(MagickFalse);
  return(DeleteNodeFromSplayTree((SplayTreeInfo *) image->properties,property));
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   D e s t r o y I m a g e P r o p e r t i e s                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  DestroyImageProperties() destroys all properties and associated memory
%  attached to the given image.
%
%  The format of the DestroyDefines method is:
%
%      void DestroyImageProperties(Image *image)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
*/
MagickExport void DestroyImageProperties(Image *image)
{
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  if (image->properties != (void *) NULL)
    image->properties=(void *) DestroySplayTree((SplayTreeInfo *)
      image->properties);
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%  F o r m a t I m a g e P r o p e r t y                                      %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  FormatImageProperty() permits formatted property/value pairs to be saved as
%  an image property.
%
%  The format of the FormatImageProperty method is:
%
%      MagickBooleanType FormatImageProperty(Image *image,const char *property,
%        const char *format,...)
%
%  A description of each parameter follows.
%
%   o  image:  The image.
%
%   o  property:  The attribute property.
%
%   o  format:  A string describing the format to use to write the remaining
%      arguments.
%
*/
MagickExport MagickBooleanType FormatImageProperty(Image *image,
  const char *property,const char *format,...)
{
  char
    value[MaxTextExtent];
 
  ssize_t
    n;
 
  va_list
    operands;
 
  va_start(operands,format);
  n=FormatLocaleStringList(value,MaxTextExtent,format,operands);
  (void) n;
  va_end(operands);
  return(SetImageProperty(image,property,value));
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   G e t I m a g e P r o p e r t y                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  GetImageProperty() gets a value associated with an image property.
%
%  This includes,  profile prefixes, such as "exif:", "iptc:" and "8bim:"
%  It does not handle non-profile prefixes, such as "fx:", "option:", or
%  "artifact:".
%
%  The returned string is stored as a prosperity of the same name for faster
%  lookup later. It should NOT be freed by the caller.
%
%  The format of the GetImageProperty method is:
%
%      const char *GetImageProperty(const Image *image,const char *key)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o key: the key.
%
*/
 
static char
  *TracePSClippath(const unsigned char *,size_t,const size_t,
    const size_t),
  *TraceSVGClippath(const unsigned char *,size_t,const size_t,
    const size_t);
 
static MagickBooleanType GetIPTCProperty(const Image *image,const char *key)
{
  char
    *attribute,
    *message;
 
  const StringInfo
    *profile;
 
  long
    count,
    dataset,
    record;
 
  ssize_t
    i;
 
  size_t
    length;
 
  profile=GetImageProfile(image,"iptc");
  if (profile == (StringInfo *) NULL)
    profile=GetImageProfile(image,"8bim");
  if (profile == (StringInfo *) NULL)
    return(MagickFalse);
  count=sscanf(key,"IPTC:%ld:%ld",&dataset,&record);
  if (count != 2)
    return(MagickFalse);
  attribute=(char *) NULL;
  for (i=0; i < (ssize_t) GetStringInfoLength(profile); i+=(ssize_t) length)
  {
    length=1;
    if ((ssize_t) GetStringInfoDatum(profile)[i] != 0x1c)
      continue;
    length=(size_t) (GetStringInfoDatum(profile)[i+3] << 8);
    length|=GetStringInfoDatum(profile)[i+4];
    if (((long) GetStringInfoDatum(profile)[i+1] == dataset) &&
        ((long) GetStringInfoDatum(profile)[i+2] == record))
      {
        message=(char *) NULL;
        if (~length >= 1)
          message=(char *) AcquireQuantumMemory(length+1UL,sizeof(*message));
        if (message != (char *) NULL)
          {
            (void) CopyMagickString(message,(char *) GetStringInfoDatum(
              profile)+i+5,length+1);
            (void) ConcatenateString(&attribute,message);
            (void) ConcatenateString(&attribute,";");
            message=DestroyString(message);
          }
      }
    i+=5;
  }
  if ((attribute == (char *) NULL) || (*attribute == ';'))
    {
      if (attribute != (char *) NULL)
        attribute=DestroyString(attribute);
      return(MagickFalse);
    }
  attribute[strlen(attribute)-1]='\0';
  (void) SetImageProperty((Image *) image,key,(const char *) attribute);
  attribute=DestroyString(attribute);
  return(MagickTrue);
}
 
static inline int ReadPropertyByte(const unsigned char **p,size_t *length)
{
  int
    c;
 
  if (*length < 1)
    return(EOF);
  c=(int) (*(*p)++);
  (*length)--;
  return(c);
}
 
static inline signed int ReadPropertyMSBLong(const unsigned char **p,
  size_t *length)
{
  union
  {
    unsigned int
      unsigned_value;
 
    signed int
      signed_value;
  } quantum;
 
  int
    c;
 
  ssize_t
    i;
 
  unsigned char
    buffer[4];
 
  unsigned int
    value;
 
  if (*length < 4)
    return(-1);
  for (i=0; i < 4; i++)
  {
    c=(int) (*(*p)++);
    (*length)--;
    buffer[i]=(unsigned char) c;
  }
  value=(unsigned int) buffer[0] << 24;
  value|=(unsigned int) buffer[1] << 16;
  value|=(unsigned int) buffer[2] << 8;
  value|=(unsigned int) buffer[3];
  quantum.unsigned_value=value & 0xffffffff;
  return(quantum.signed_value);
}
 
static inline signed short ReadPropertyMSBShort(const unsigned char **p,
  size_t *length)
{
  union
  {
    unsigned short
      unsigned_value;
 
    signed short
      signed_value;
  } quantum;
 
  int
    c;
 
  ssize_t
    i;
 
  unsigned char
    buffer[2];
 
  unsigned short
    value;
 
  if (*length < 2)
    return((unsigned short) ~0);
  for (i=0; i < 2; i++)
  {
    c=(int) (*(*p)++);
    (*length)--;
    buffer[i]=(unsigned char) c;
  }
  value=(unsigned short) buffer[0] << 8;
  value|=(unsigned short) buffer[1];
  quantum.unsigned_value=value & 0xffff;
  return(quantum.signed_value);
}
 
static MagickBooleanType Get8BIMProperty(const Image *image,const char *key)
{
  char
    *attribute,
    format[MaxTextExtent],
    name[MaxTextExtent],
    *resource;
 
  const StringInfo
    *profile;
 
  const unsigned char
    *info;
 
  long
    start,
    stop;
 
  MagickBooleanType
    status;
 
  ssize_t
    i;
 
  size_t
    length;
 
  ssize_t
    count,
    id,
    sub_number;
 
  /*
    There are no newlines in path names, so it's safe as terminator.
  */
  profile=GetImageProfile(image,"8bim");
  if (profile == (StringInfo *) NULL)
    return(MagickFalse);
  count=(ssize_t) sscanf(key,"8BIM:%ld,%ld:%1024[^\n]\n%1024[^\n]",&start,&stop,
    name,format);
  if ((count != 2) && (count != 3) && (count != 4))
    return(MagickFalse);
  if (count < 4)
    (void) CopyMagickString(format,"SVG",MaxTextExtent);
  if (count < 3)
    *name='\0';
  sub_number=1;
  if (*name == '#')
    sub_number=(ssize_t) StringToLong(&name[1]);
  sub_number=MagickMax(sub_number,1L);
  resource=(char *) NULL;
  status=MagickFalse;
  length=GetStringInfoLength(profile);
  info=GetStringInfoDatum(profile);
  while ((length > 0) && (status == MagickFalse))
  {
    if (ReadPropertyByte(&info,&length) != (unsigned char) '8')
      continue;
    if (ReadPropertyByte(&info,&length) != (unsigned char) 'B')
      continue;
    if (ReadPropertyByte(&info,&length) != (unsigned char) 'I')
      continue;
    if (ReadPropertyByte(&info,&length) != (unsigned char) 'M')
      continue;
    id=(ssize_t) ReadPropertyMSBShort(&info,&length);
    if (id < (ssize_t) start)
      continue;
    if (id > (ssize_t) stop)
      continue;
    if (resource != (char *) NULL)
      resource=DestroyString(resource);
    count=(ssize_t) ReadPropertyByte(&info,&length);
    if ((count != 0) && ((size_t) count <= length))
      {
        resource=(char *) NULL;
        if (~((size_t) count) >= (MaxTextExtent-1))
          resource=(char *) AcquireQuantumMemory((size_t) count+MaxTextExtent,
            sizeof(*resource));
        if (resource != (char *) NULL)
          {
            for (i=0; i < (ssize_t) count; i++)
              resource[i]=(char) ReadPropertyByte(&info,&length);
            resource[count]='\0';
          }
      }
    if ((count & 0x01) == 0)
      (void) ReadPropertyByte(&info,&length);
    count=(ssize_t) ReadPropertyMSBLong(&info,&length);
    if ((count < 0) || ((size_t) count > length))
      {
        length=0;
        continue;
      }
    if ((*name != '\0') && (*name != '#'))
      if ((resource == (char *) NULL) || (LocaleCompare(name,resource) != 0))
        {
          /*
            No name match, scroll forward and try next.
          */
          info+=count;
          length-=MagickMin(count,(ssize_t) length);
          continue;
        }
    if ((*name == '#') && (sub_number != 1))
      {
        /*
          No numbered match, scroll forward and try next.
        */
        sub_number--;
        info+=count;
        length-=MagickMin(count,(ssize_t) length);
        continue;
      }
    /*
      We have the resource of interest.
    */
    attribute=(char *) NULL;
    if (~((size_t) count) >= (MaxTextExtent-1))
      attribute=(char *) AcquireQuantumMemory((size_t) count+MaxTextExtent,
        sizeof(*attribute));
    if (attribute != (char *) NULL)
      {
        (void) memcpy(attribute,(char *) info,(size_t) count);
        attribute[count]='\0';
        info+=count;
        length-=MagickMin(count,(ssize_t) length);
        if ((id <= 1999) || (id >= 2999))
          (void) SetImageProperty((Image *) image,key,(const char *) attribute);
        else
          {
            char
              *path;
 
            if (LocaleCompare(format,"svg") == 0)
              path=TraceSVGClippath((unsigned char *) attribute,(size_t) count,
                image->columns,image->rows);
            else
              path=TracePSClippath((unsigned char *) attribute,(size_t) count,
                image->columns,image->rows);
            (void) SetImageProperty((Image *) image,key,(const char *) path);
            path=DestroyString(path);
          }
        attribute=DestroyString(attribute);
        status=MagickTrue;
      }
  }
  if (resource != (char *) NULL)
    resource=DestroyString(resource);
  return(status);
}
 
static inline signed int ReadPropertySignedLong(const EndianType endian,
  const unsigned char *buffer)
{
  union
  {
    unsigned int
      unsigned_value;
 
    signed int
      signed_value;
  } quantum;
 
  unsigned int
    value;
 
  if (endian == LSBEndian)
    {
      value=(unsigned int) buffer[3] << 24;
      value|=(unsigned int) buffer[2] << 16;
      value|=(unsigned int) buffer[1] << 8;
      value|=(unsigned int) buffer[0];
      quantum.unsigned_value=value & 0xffffffff;
      return(quantum.signed_value);
    }
  value=(unsigned int) buffer[0] << 24;
  value|=(unsigned int) buffer[1] << 16;
  value|=(unsigned int) buffer[2] << 8;
  value|=(unsigned int) buffer[3];
  quantum.unsigned_value=value & 0xffffffff;
  return(quantum.signed_value);
}
 
static inline unsigned int ReadPropertyUnsignedLong(const EndianType endian,
  const unsigned char *buffer)
{
  unsigned int
    value;
 
  if (endian == LSBEndian)
    {
      value=(unsigned int) buffer[3] << 24;
      value|=(unsigned int) buffer[2] << 16;
      value|=(unsigned int) buffer[1] << 8;
      value|=(unsigned int) buffer[0];
      return(value & 0xffffffff);
    }
  value=(unsigned int) buffer[0] << 24;
  value|=(unsigned int) buffer[1] << 16;
  value|=(unsigned int) buffer[2] << 8;
  value|=(unsigned int) buffer[3];
  return(value & 0xffffffff);
}
 
static inline signed short ReadPropertySignedShort(const EndianType endian,
  const unsigned char *buffer)
{
  union
  {
    unsigned short
      unsigned_value;
 
    signed short
      signed_value;
  } quantum;
 
  unsigned short
    value;
 
  if (endian == LSBEndian)
    {
      value=(unsigned short) buffer[1] << 8;
      value|=(unsigned short) buffer[0];
      quantum.unsigned_value=value & 0xffff;
      return(quantum.signed_value);
    }
  value=(unsigned short) buffer[0] << 8;
  value|=(unsigned short) buffer[1];
  quantum.unsigned_value=value & 0xffff;
  return(quantum.signed_value);
}
 
static inline unsigned short ReadPropertyUnsignedShort(const EndianType endian,
  const unsigned char *buffer)
{
  unsigned short
    value;
 
  if (endian == LSBEndian)
    {
      value=(unsigned short) buffer[1] << 8;
      value|=(unsigned short) buffer[0];
      return(value & 0xffff);
    }
  value=(unsigned short) buffer[0] << 8;
  value|=(unsigned short) buffer[1];
  return(value & 0xffff);
}
 
static MagickBooleanType GetEXIFProperty(const Image *image,
  const char *property)
{
#define MaxDirectoryStack  16
#define EXIF_DELIMITER  "\n"
#define EXIF_NUM_FORMATS  12
#define EXIF_FMT_BYTE  1
#define EXIF_FMT_STRING  2
#define EXIF_FMT_USHORT  3
#define EXIF_FMT_ULONG  4
#define EXIF_FMT_URATIONAL  5
#define EXIF_FMT_SBYTE  6
#define EXIF_FMT_UNDEFINED  7
#define EXIF_FMT_SSHORT  8
#define EXIF_FMT_SLONG  9
#define EXIF_FMT_SRATIONAL  10
#define EXIF_FMT_SINGLE  11
#define EXIF_FMT_DOUBLE  12
#define GPS_LATITUDE  0x10002
#define GPS_LONGITUDE  0x10004
#define GPS_TIMESTAMP  0x10007
#define TAG_EXIF_OFFSET  0x8769
#define TAG_GPS_OFFSET  0x8825
#define TAG_INTEROP_OFFSET  0xa005
 
 
#define EXIFGPSFractions(format,arg1,arg2,arg3,arg4,arg5,arg6) \
{ \
   size_t \
     extent = 0; \
 \
   ssize_t \
     component = 0; \
 \
   for ( ; component < components; component++) \
   { \
     if (component != 0) \
       extent+=(size_t) FormatLocaleString(buffer+extent,MagickPathExtent- \
         extent,", "); \
     extent+=(size_t) FormatLocaleString(buffer+extent,MagickPathExtent- \
       extent,format,(arg1),(arg2),(arg3),(arg4),(arg5),(arg6)); \
     if (extent >= (MagickPathExtent-1)) \
       extent=MagickPathExtent-1; \
   } \
   buffer[extent]='\0'; \
   value=AcquireString(buffer); \
}
 
#define EXIFMultipleValues(format,arg) \
{ \
   size_t \
     extent = 0; \
 \
   ssize_t \
     component = 0; \
 \
   for ( ; component < components; component++) \
   { \
     if (component != 0) \
       extent+=(size_t) FormatLocaleString(buffer+extent,MagickPathExtent- \
         extent,", "); \
     extent+=(size_t) FormatLocaleString(buffer+extent,MagickPathExtent- \
       extent,format,arg); \
     if (extent >= (MagickPathExtent-1)) \
       extent=MagickPathExtent-1; \
   } \
   buffer[extent]='\0'; \
   value=AcquireString(buffer); \
}
 
#define EXIFMultipleFractions(format,arg1,arg2) \
{ \
   size_t \
     extent = 0; \
 \
   ssize_t \
     component = 0; \
 \
   for ( ; component < components; component++) \
   { \
     if (component != 0) \
       extent+=(size_t) FormatLocaleString(buffer+extent,MagickPathExtent-\
         extent,", "); \
     extent+=(size_t) FormatLocaleString(buffer+extent,MagickPathExtent- \
       extent,format,(arg1),(arg2)); \
     if (extent >= (MagickPathExtent-1)) \
       extent=MagickPathExtent-1; \
   } \
   buffer[extent]='\0'; \
   value=AcquireString(buffer); \
}
 
  typedef struct _DirectoryInfo
  {
    const unsigned char
      *directory;
 
    size_t
      entry;
 
    ssize_t
      offset;
  } DirectoryInfo;
 
  typedef struct _TagInfo
  {
    size_t
      tag;
 
    const char
      description[36];
  } TagInfo;
 
  static const TagInfo
    EXIFTag[] =
    {
      {  0x001, "exif:InteroperabilityIndex" },
      {  0x002, "exif:InteroperabilityVersion" },
      {  0x100, "exif:ImageWidth" },
      {  0x101, "exif:ImageLength" },
      {  0x102, "exif:BitsPerSample" },
      {  0x103, "exif:Compression" },
      {  0x106, "exif:PhotometricInterpretation" },
      {  0x10a, "exif:FillOrder" },
      {  0x10d, "exif:DocumentName" },
      {  0x10e, "exif:ImageDescription" },
      {  0x10f, "exif:Make" },
      {  0x110, "exif:Model" },
      {  0x111, "exif:StripOffsets" },
      {  0x112, "exif:Orientation" },
      {  0x115, "exif:SamplesPerPixel" },
      {  0x116, "exif:RowsPerStrip" },
      {  0x117, "exif:StripByteCounts" },
      {  0x11a, "exif:XResolution" },
      {  0x11b, "exif:YResolution" },
      {  0x11c, "exif:PlanarConfiguration" },
      {  0x11d, "exif:PageName" },
      {  0x11e, "exif:XPosition" },
      {  0x11f, "exif:YPosition" },
      {  0x118, "exif:MinSampleValue" },
      {  0x119, "exif:MaxSampleValue" },
      {  0x120, "exif:FreeOffsets" },
      {  0x121, "exif:FreeByteCounts" },
      {  0x122, "exif:GrayResponseUnit" },
      {  0x123, "exif:GrayResponseCurve" },
      {  0x124, "exif:T4Options" },
      {  0x125, "exif:T6Options" },
      {  0x128, "exif:ResolutionUnit" },
      {  0x12d, "exif:TransferFunction" },
      {  0x131, "exif:Software" },
      {  0x132, "exif:DateTime" },
      {  0x13b, "exif:Artist" },
      {  0x13e, "exif:WhitePoint" },
      {  0x13f, "exif:PrimaryChromaticities" },
      {  0x140, "exif:ColorMap" },
      {  0x141, "exif:HalfToneHints" },
      {  0x142, "exif:TileWidth" },
      {  0x143, "exif:TileLength" },
      {  0x144, "exif:TileOffsets" },
      {  0x145, "exif:TileByteCounts" },
      {  0x14a, "exif:SubIFD" },
      {  0x14c, "exif:InkSet" },
      {  0x14d, "exif:InkNames" },
      {  0x14e, "exif:NumberOfInks" },
      {  0x150, "exif:DotRange" },
      {  0x151, "exif:TargetPrinter" },
      {  0x152, "exif:ExtraSample" },
      {  0x153, "exif:SampleFormat" },
      {  0x154, "exif:SMinSampleValue" },
      {  0x155, "exif:SMaxSampleValue" },
      {  0x156, "exif:TransferRange" },
      {  0x157, "exif:ClipPath" },
      {  0x158, "exif:XClipPathUnits" },
      {  0x159, "exif:YClipPathUnits" },
      {  0x15a, "exif:Indexed" },
      {  0x15b, "exif:JPEGTables" },
      {  0x15f, "exif:OPIProxy" },
      {  0x200, "exif:JPEGProc" },
      {  0x201, "exif:JPEGInterchangeFormat" },
      {  0x202, "exif:JPEGInterchangeFormatLength" },
      {  0x203, "exif:JPEGRestartInterval" },
      {  0x205, "exif:JPEGLosslessPredictors" },
      {  0x206, "exif:JPEGPointTransforms" },
      {  0x207, "exif:JPEGQTables" },
      {  0x208, "exif:JPEGDCTables" },
      {  0x209, "exif:JPEGACTables" },
      {  0x211, "exif:YCbCrCoefficients" },
      {  0x212, "exif:YCbCrSubSampling" },
      {  0x213, "exif:YCbCrPositioning" },
      {  0x214, "exif:ReferenceBlackWhite" },
      {  0x2bc, "exif:ExtensibleMetadataPlatform" },
      {  0x301, "exif:Gamma" },
      {  0x302, "exif:ICCProfileDescriptor" },
      {  0x303, "exif:SRGBRenderingIntent" },
      {  0x320, "exif:ImageTitle" },
      {  0x5001, "exif:ResolutionXUnit" },
      {  0x5002, "exif:ResolutionYUnit" },
      {  0x5003, "exif:ResolutionXLengthUnit" },
      {  0x5004, "exif:ResolutionYLengthUnit" },
      {  0x5005, "exif:PrintFlags" },
      {  0x5006, "exif:PrintFlagsVersion" },
      {  0x5007, "exif:PrintFlagsCrop" },
      {  0x5008, "exif:PrintFlagsBleedWidth" },
      {  0x5009, "exif:PrintFlagsBleedWidthScale" },
      {  0x500A, "exif:HalftoneLPI" },
      {  0x500B, "exif:HalftoneLPIUnit" },
      {  0x500C, "exif:HalftoneDegree" },
      {  0x500D, "exif:HalftoneShape" },
      {  0x500E, "exif:HalftoneMisc" },
      {  0x500F, "exif:HalftoneScreen" },
      {  0x5010, "exif:JPEGQuality" },
      {  0x5011, "exif:GridSize" },
      {  0x5012, "exif:ThumbnailFormat" },
      {  0x5013, "exif:ThumbnailWidth" },
      {  0x5014, "exif:ThumbnailHeight" },
      {  0x5015, "exif:ThumbnailColorDepth" },
      {  0x5016, "exif:ThumbnailPlanes" },
      {  0x5017, "exif:ThumbnailRawBytes" },
      {  0x5018, "exif:ThumbnailSize" },
      {  0x5019, "exif:ThumbnailCompressedSize" },
      {  0x501a, "exif:ColorTransferFunction" },
      {  0x501b, "exif:ThumbnailData" },
      {  0x5020, "exif:ThumbnailImageWidth" },
      {  0x5021, "exif:ThumbnailImageHeight" },
      {  0x5022, "exif:ThumbnailBitsPerSample" },
      {  0x5023, "exif:ThumbnailCompression" },
      {  0x5024, "exif:ThumbnailPhotometricInterp" },
      {  0x5025, "exif:ThumbnailImageDescription" },
      {  0x5026, "exif:ThumbnailEquipMake" },
      {  0x5027, "exif:ThumbnailEquipModel" },
      {  0x5028, "exif:ThumbnailStripOffsets" },
      {  0x5029, "exif:ThumbnailOrientation" },
      {  0x502a, "exif:ThumbnailSamplesPerPixel" },
      {  0x502b, "exif:ThumbnailRowsPerStrip" },
      {  0x502c, "exif:ThumbnailStripBytesCount" },
      {  0x502d, "exif:ThumbnailResolutionX" },
      {  0x502e, "exif:ThumbnailResolutionY" },
      {  0x502f, "exif:ThumbnailPlanarConfig" },
      {  0x5030, "exif:ThumbnailResolutionUnit" },
      {  0x5031, "exif:ThumbnailTransferFunction" },
      {  0x5032, "exif:ThumbnailSoftwareUsed" },
      {  0x5033, "exif:ThumbnailDateTime" },
      {  0x5034, "exif:ThumbnailArtist" },
      {  0x5035, "exif:ThumbnailWhitePoint" },
      {  0x5036, "exif:ThumbnailPrimaryChromaticities" },
      {  0x5037, "exif:ThumbnailYCbCrCoefficients" },
      {  0x5038, "exif:ThumbnailYCbCrSubsampling" },
      {  0x5039, "exif:ThumbnailYCbCrPositioning" },
      {  0x503A, "exif:ThumbnailRefBlackWhite" },
      {  0x503B, "exif:ThumbnailCopyRight" },
      {  0x5090, "exif:LuminanceTable" },
      {  0x5091, "exif:ChrominanceTable" },
      {  0x5100, "exif:FrameDelay" },
      {  0x5101, "exif:LoopCount" },
      {  0x5110, "exif:PixelUnit" },
      {  0x5111, "exif:PixelPerUnitX" },
      {  0x5112, "exif:PixelPerUnitY" },
      {  0x5113, "exif:PaletteHistogram" },
      {  0x1000, "exif:RelatedImageFileFormat" },
      {  0x1001, "exif:RelatedImageLength" },
      {  0x1002, "exif:RelatedImageWidth" },
      {  0x800d, "exif:ImageID" },
      {  0x80e3, "exif:Matteing" },
      {  0x80e4, "exif:DataType" },
      {  0x80e5, "exif:ImageDepth" },
      {  0x80e6, "exif:TileDepth" },
      {  0x828d, "exif:CFARepeatPatternDim" },
      {  0x828e, "exif:CFAPattern2" },
      {  0x828f, "exif:BatteryLevel" },
      {  0x8298, "exif:Copyright" },
      {  0x829a, "exif:ExposureTime" },
      {  0x829d, "exif:FNumber" },
      {  0x83bb, "exif:IPTC/NAA" },
      {  0x84e3, "exif:IT8RasterPadding" },
      {  0x84e5, "exif:IT8ColorTable" },
      {  0x8649, "exif:ImageResourceInformation" },
      {  0x8769, "exif:ExifOffset" },  /* specs as "Exif IFD Pointer"? */
      {  0x8773, "exif:InterColorProfile" },
      {  0x8822, "exif:ExposureProgram" },
      {  0x8824, "exif:SpectralSensitivity" },
      {  0x8825, "exif:GPSInfo" }, /* specs as "GPSInfo IFD Pointer"? */
      {  0x8827, "exif:PhotographicSensitivity" },
      {  0x8828, "exif:OECF" },
      {  0x8829, "exif:Interlace" },      
      {  0x882a, "exif:TimeZoneOffset" },
      {  0x882b, "exif:SelfTimerMode" },
      {  0x8830, "exif:SensitivityType" },
      {  0x8831, "exif:StandardOutputSensitivity" },
      {  0x8832, "exif:RecommendedExposureIndex" },
      {  0x8833, "exif:ISOSpeed" },
      {  0x8834, "exif:ISOSpeedLatitudeyyy" },
      {  0x8835, "exif:ISOSpeedLatitudezzz" },
      {  0x9000, "exif:ExifVersion" },
      {  0x9003, "exif:DateTimeOriginal" },
      {  0x9004, "exif:DateTimeDigitized" },
      {  0x9010, "exif:OffsetTime" },
      {  0x9011, "exif:OffsetTimeOriginal" },
      {  0x9012, "exif:OffsetTimeDigitized" },
      {  0x9101, "exif:ComponentsConfiguration" },
      {  0x9102, "exif:CompressedBitsPerPixel" },
      {  0x9201, "exif:ShutterSpeedValue" },
      {  0x9202, "exif:ApertureValue" },
      {  0x9203, "exif:BrightnessValue" },
      {  0x9204, "exif:ExposureBiasValue" },
      {  0x9205, "exif:MaxApertureValue" },
      {  0x9206, "exif:SubjectDistance" },
      {  0x9207, "exif:MeteringMode" },
      {  0x9208, "exif:LightSource" },
      {  0x9209, "exif:Flash" },
      {  0x920a, "exif:FocalLength" },
      {  0x920b, "exif:FlashEnergy" },
      {  0x920c, "exif:SpatialFrequencyResponse" },
      {  0x920d, "exif:Noise" },
      {  0x9214, "exif:SubjectArea" },
      {  0x9290, "exif:SubSecTime" },
      {  0x9291, "exif:SubSecTimeOriginal" },
      {  0x9292, "exif:SubSecTimeDigitized" },    
      {  0x9211, "exif:ImageNumber" },
      {  0x9212, "exif:SecurityClassification" },
      {  0x9213, "exif:ImageHistory" },
      {  0x9214, "exif:SubjectArea" },
      {  0x9215, "exif:ExposureIndex" },
      {  0x9216, "exif:TIFF-EPStandardID" },
      {  0x927c, "exif:MakerNote" },
      {  0x9286, "exif:UserComment" },
      {  0x9290, "exif:SubSecTime" },
      {  0x9291, "exif:SubSecTimeOriginal" },
      {  0x9292, "exif:SubSecTimeDigitized" },    
      {  0x9400, "exif:Temperature" },
      {  0x9401, "exif:Humidity" },
      {  0x9402, "exif:Pressure" },
      {  0x9403, "exif:WaterDepth" },
      {  0x9404, "exif:Acceleration" },
      {  0x9405, "exif:CameraElevationAngle" },    
      {  0x9C9b, "exif:WinXP-Title" },
      {  0x9C9c, "exif:WinXP-Comments" },
      {  0x9C9d, "exif:WinXP-Author" },
      {  0x9C9e, "exif:WinXP-Keywords" },
      {  0x9C9f, "exif:WinXP-Subject" },      
      {  0xa000, "exif:FlashPixVersion" },
      {  0xa001, "exif:ColorSpace" },
      {  0xa002, "exif:PixelXDimension" },
      {  0xa003, "exif:PixelYDimension" },
      {  0xa004, "exif:RelatedSoundFile" },
      {  0xa005, "exif:InteroperabilityOffset" },
      {  0xa20b, "exif:FlashEnergy" },
      {  0xa20c, "exif:SpatialFrequencyResponse" },
      {  0xa20d, "exif:Noise" },
      {  0xa20e, "exif:FocalPlaneXResolution" },
      {  0xa20f, "exif:FocalPlaneYResolution" },
      {  0xa210, "exif:FocalPlaneResolutionUnit" },
      {  0xa214, "exif:SubjectLocation" },
      {  0xa215, "exif:ExposureIndex" },
      {  0xa216, "exif:TIFF/EPStandardID" },
      {  0xa217, "exif:SensingMethod" },
      {  0xa300, "exif:FileSource" },
      {  0xa301, "exif:SceneType" },
      {  0xa302, "exif:CFAPattern" },
      {  0xa401, "exif:CustomRendered" },
      {  0xa402, "exif:ExposureMode" },
      {  0xa403, "exif:WhiteBalance" },
      {  0xa404, "exif:DigitalZoomRatio" },
      {  0xa405, "exif:FocalLengthIn35mmFilm" },
      {  0xa406, "exif:SceneCaptureType" },
      {  0xa407, "exif:GainControl" },
      {  0xa408, "exif:Contrast" },
      {  0xa409, "exif:Saturation" },
      {  0xa40a, "exif:Sharpness" },
      {  0xa40b, "exif:DeviceSettingDescription" },
      {  0xa40c, "exif:SubjectDistanceRange" },
      {  0xa420, "exif:ImageUniqueID" },
      {  0xa430, "exif:CameraOwnerName" },
      {  0xa431, "exif:BodySerialNumber" },
      {  0xa432, "exif:LensSpecification" },
      {  0xa433, "exif:LensMake" },
      {  0xa434, "exif:LensModel" },
      {  0xa435, "exif:LensSerialNumber" },
      {  0xc4a5, "exif:PrintImageMatching" },
      {  0xa500, "exif:Gamma" },
      {  0xc640, "exif:CR2Slice" },
      { 0x10000, "exif:GPSVersionID" },
      { 0x10001, "exif:GPSLatitudeRef" },
      { 0x10002, "exif:GPSLatitude" },
      { 0x10003, "exif:GPSLongitudeRef" },
      { 0x10004, "exif:GPSLongitude" },
      { 0x10005, "exif:GPSAltitudeRef" },
      { 0x10006, "exif:GPSAltitude" },
      { 0x10007, "exif:GPSTimeStamp" },
      { 0x10008, "exif:GPSSatellites" },
      { 0x10009, "exif:GPSStatus" },
      { 0x1000a, "exif:GPSMeasureMode" },
      { 0x1000b, "exif:GPSDop" },
      { 0x1000c, "exif:GPSSpeedRef" },
      { 0x1000d, "exif:GPSSpeed" },
      { 0x1000e, "exif:GPSTrackRef" },
      { 0x1000f, "exif:GPSTrack" },
      { 0x10010, "exif:GPSImgDirectionRef" },
      { 0x10011, "exif:GPSImgDirection" },
      { 0x10012, "exif:GPSMapDatum" },
      { 0x10013, "exif:GPSDestLatitudeRef" },
      { 0x10014, "exif:GPSDestLatitude" },
      { 0x10015, "exif:GPSDestLongitudeRef" },
      { 0x10016, "exif:GPSDestLongitude" },
      { 0x10017, "exif:GPSDestBearingRef" },
      { 0x10018, "exif:GPSDestBearing" },
      { 0x10019, "exif:GPSDestDistanceRef" },
      { 0x1001a, "exif:GPSDestDistance" },
      { 0x1001b, "exif:GPSProcessingMethod" },
      { 0x1001c, "exif:GPSAreaInformation" },
      { 0x1001d, "exif:GPSDateStamp" },
      { 0x1001e, "exif:GPSDifferential" },
      { 0x1001f, "exif:GPSHPositioningError" },
      { 0x00000, "" }
    };  /* http://www.cipa.jp/std/documents/e/DC-008-Translation-2016-E.pdf */
 
  const StringInfo
    *profile;
 
  const unsigned char
    *directory,
    *exif;
 
  DirectoryInfo
    directory_stack[MaxDirectoryStack] = { { 0, 0, 0 } };
 
  EndianType
    endian;
 
  MagickBooleanType
    status;
 
  ssize_t
    i;
 
  size_t
    entry,
    length,
    number_entries,
    tag,
    tag_value;
 
  SplayTreeInfo
    *exif_resources;
 
  ssize_t
    all,
    id,
    level,
    offset,
    tag_offset;
 
  static int
    tag_bytes[] = {0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8};
 
  /*
    If EXIF data exists, then try to parse the request for a tag.
  */
  profile=GetImageProfile(image,"exif");
  if (profile == (const StringInfo *) NULL)
    return(MagickFalse);
  if ((property == (const char *) NULL) || (*property == '\0'))
    return(MagickFalse);
  while (isspace((int) ((unsigned char) *property)) != 0)
    property++;
  if (strlen(property) <= 5)
    return(MagickFalse);
  all=0;
  tag=(~0UL);
  switch (*(property+5))
  {
    case '*':
    {
      /*
        Caller has asked for all the tags in the EXIF data.
      */
      tag=0;
      all=1; /* return the data in description=value format */
      break;
    }
    case '!':
    {
      tag=0;
      all=2; /* return the data in tagid=value format */
      break;
    }
    case '#':
    case '@':
    {
      int
        c;
 
      size_t
        n;
 
      /*
        Check for a hex based tag specification first.
      */
      tag=(*(property+5) == '@') ? 1UL : 0UL;
      property+=6;
      n=strlen(property);
      if (n != 4)
        return(MagickFalse);
      /*
        Parse tag specification as a hex number.
      */
      n/=4;
      do
      {
        for (i=(ssize_t) n-1L; i >= 0; i--)
        {
          c=(*property++);
          tag<<=4;
          if ((c >= '0') && (c <= '9'))
            tag|=(c-'0');
          else
            if ((c >= 'A') && (c <= 'F'))
              tag|=(c-('A'-10));
            else
              if ((c >= 'a') && (c <= 'f'))
                tag|=(c-('a'-10));
              else
                return(MagickFalse);
        }
      } while (*property != '\0');
      break;
    }
    default:
    {
      /*
        Try to match the text with a tag name instead.
      */
      for (i=0; ; i++)
      {
        if (EXIFTag[i].tag == 0)
          break;
        if (LocaleCompare(EXIFTag[i].description,property) == 0)
          {
            tag=(size_t) EXIFTag[i].tag;
            break;
          }
      }
      break;
    }
  }
  if (tag == (~0UL))
    return(MagickFalse);
  length=GetStringInfoLength(profile);
  if (length < 6)
    return(MagickFalse);
  exif=GetStringInfoDatum(profile);
  while (length != 0)
  {
    if (ReadPropertyByte(&exif,&length) != 0x45)
      continue;
    if (ReadPropertyByte(&exif,&length) != 0x78)
      continue;
    if (ReadPropertyByte(&exif,&length) != 0x69)
      continue;
    if (ReadPropertyByte(&exif,&length) != 0x66)
      continue;
    if (ReadPropertyByte(&exif,&length) != 0x00)
      continue;
    if (ReadPropertyByte(&exif,&length) != 0x00)
      continue;
    break;
  }
  if (length < 16)
    return(MagickFalse);
  id=(ssize_t) ReadPropertySignedShort(LSBEndian,exif);
  endian=LSBEndian;
  if (id == 0x4949)
    endian=LSBEndian;
  else
    if (id == 0x4D4D)
      endian=MSBEndian;
    else
      return(MagickFalse);
  if (ReadPropertyUnsignedShort(endian,exif+2) != 0x002a)
    return(MagickFalse);
  /*
    This the offset to the first IFD.
  */
  offset=(ssize_t) ReadPropertySignedLong(endian,exif+4);
  if ((offset < 0) || (size_t) offset >= length)
    return(MagickFalse);
  /*
    Set the pointer to the first IFD and follow it were it leads.
  */
  status=MagickFalse;
  directory=exif+offset;
  level=0;
  entry=0;
  tag_offset=0;
  exif_resources=NewSplayTree((int (*)(const void *,const void *)) NULL,
    (void *(*)(void *)) NULL,(void *(*)(void *)) NULL);
  do
  {
    /*
      If there is anything on the stack then pop it off.
    */
    if (level > 0)
      {
        level--;
        directory=directory_stack[level].directory;
        entry=directory_stack[level].entry;
        tag_offset=directory_stack[level].offset;
      }
    if ((directory < exif) || (directory > (exif+length-2)))
      break;
    /*
      Determine how many entries there are in the current IFD.
    */
    number_entries=(size_t) ReadPropertyUnsignedShort(endian,directory);
    for ( ; entry < number_entries; entry++)
    {
      unsigned char
        *p,
        *q;
 
      size_t
        format;
 
      ssize_t
        number_bytes,
        components;
 
      q=(unsigned char *) (directory+(12*entry)+2);
      if (q > (exif+length-12))
        break;  /* corrupt EXIF */
      if (GetValueFromSplayTree(exif_resources,q) == q)
        break;
      (void) AddValueToSplayTree(exif_resources,q,q);
      tag_value=(size_t) ReadPropertyUnsignedShort(endian,q)+tag_offset;
      format=(size_t) ReadPropertyUnsignedShort(endian,q+2);
      if (format >= (sizeof(tag_bytes)/sizeof(*tag_bytes)))
        break;
      if (format == 0)
        break;  /* corrupt EXIF */
      components=(ssize_t) ReadPropertySignedLong(endian,q+4);
      if (components < 0)
        break;  /* corrupt EXIF */
      number_bytes=(size_t) components*tag_bytes[format];
      if (number_bytes < components)
        break;  /* prevent overflow */
      if (number_bytes <= 4)
        p=q+8;
      else
        {
          ssize_t
            dir_offset;
 
          /*
            The directory entry contains an offset.
          */
          dir_offset=(ssize_t) ReadPropertySignedLong(endian,q+8);
          if ((dir_offset < 0) || (size_t) dir_offset >= length)
            continue;
          if (((size_t) dir_offset+number_bytes) < (size_t) dir_offset)
            continue;  /* prevent overflow */
          if (((size_t) dir_offset+number_bytes) > length)
            continue;
          p=(unsigned char *) (exif+dir_offset);
        }
      if ((all != 0) || (tag == (size_t) tag_value))
        {
          char
            buffer[6*sizeof(double)+MaxTextExtent],
            *value;
 
          if ((p < exif) || (p > (exif+length-tag_bytes[format])))
            break;
          value=(char *) NULL;
          *buffer='\0';
          switch (format)
          {
            case EXIF_FMT_BYTE:
            {
              value=(char *) NULL;
              if (~((size_t) number_bytes) >= 1)
                value=(char *) AcquireQuantumMemory((size_t) number_bytes+1UL,
                  sizeof(*value));
              if (value != (char *) NULL)
                {
                  for (i=0; i < (ssize_t) number_bytes; i++)
                  {
                    value[i]='.';
                    if (isprint((int) p[i]) != 0) 
                      value[i]=(char) p[i];
                  }
                  value[i]='\0';
                }
              break;
            }
            case EXIF_FMT_SBYTE:
            {
              EXIFMultipleValues("%.20g",(double) (*(signed char *) p));
              break;
            }
            case EXIF_FMT_SSHORT:
            {
              EXIFMultipleValues("%hd",ReadPropertySignedShort(endian,p));
              break;
            }
            case EXIF_FMT_USHORT:
            {
              EXIFMultipleValues("%hu",ReadPropertyUnsignedShort(endian,p));
              break;
            }
            case EXIF_FMT_ULONG:
            {
              EXIFMultipleValues("%.20g",(double)
                ReadPropertyUnsignedLong(endian,p));
              break;
            }
            case EXIF_FMT_SLONG:
            {
              EXIFMultipleValues("%.20g",(double)
                ReadPropertySignedLong(endian,p));
              break;
            }
            case EXIF_FMT_URATIONAL:
            {
              if ((tag_value == GPS_LATITUDE) || (tag_value == GPS_LONGITUDE) ||
                  (tag_value == GPS_TIMESTAMP))
                {
                  components=1;
                  EXIFGPSFractions("%.20g/%.20g,%.20g/%.20g,%.20g/%.20g",
                    (double) ReadPropertyUnsignedLong(endian,p),
                    (double) ReadPropertyUnsignedLong(endian,p+4),
                    (double) ReadPropertyUnsignedLong(endian,p+8),
                    (double) ReadPropertyUnsignedLong(endian,p+12),
                    (double) ReadPropertyUnsignedLong(endian,p+16),
                    (double) ReadPropertyUnsignedLong(endian,p+20));
                  break;
                }
              EXIFMultipleFractions("%.20g/%.20g",(double)
                ReadPropertyUnsignedLong(endian,p),(double)
                ReadPropertyUnsignedLong(endian,p+4));
              break;
            }
            case EXIF_FMT_SRATIONAL:
            {
              EXIFMultipleFractions("%.20g/%.20g",(double)
                ReadPropertySignedLong(endian,p),(double)
                ReadPropertySignedLong(endian,p+4));
              break;
            }
            case EXIF_FMT_SINGLE:
            {
              EXIFMultipleValues("%.20g",(double)
                ReadPropertySignedLong(endian,p));
              break;
            }
            case EXIF_FMT_DOUBLE:
            {
              EXIFMultipleValues("%.20g",(double)
                ReadPropertySignedLong(endian,p));
              break;
            }
            case EXIF_FMT_STRING:
            case EXIF_FMT_UNDEFINED:
            default:
            {
              if ((p < exif) || (p > (exif+length-number_bytes)))
                break;
              value=(char *) NULL;
              if (~((size_t) number_bytes) >= 1)
                value=(char *) AcquireQuantumMemory((size_t) number_bytes+1UL,
                  sizeof(*value));
              if (value != (char *) NULL)
                {
                  ssize_t
                    i;
 
                  for (i=0; i < (ssize_t) number_bytes; i++)
                  {
                    value[i]='.';
                    if ((isprint((int) p[i]) != 0) || (p[i] == '\0'))
                      value[i]=(char) p[i];
                  }
                  value[i]='\0';
                }
              break;
            }
          }
          if (value != (char *) NULL)
            {
              char
                *key;
 
              const char
                *p;
 
              key=AcquireString(property);
              switch (all)
              {
                case 1:
                {
                  const char
                    *description;
 
                  ssize_t
                    i;
 
                  description="unknown";
                  for (i=0; ; i++)
                  {
                    if (EXIFTag[i].tag == 0)
                      break;
                    if (EXIFTag[i].tag == tag_value)
                      {
                        description=EXIFTag[i].description;
                        break;
                      }
                  }
                  (void) FormatLocaleString(key,MaxTextExtent,"%s",
                    description);
                  if (level == 2)
                    (void) SubstituteString(&key,"exif:","exif:thumbnail:");
                  break;
                }
                case 2:
                {
                  if (tag_value < 0x10000)
                    (void) FormatLocaleString(key,MaxTextExtent,"#%04lx",
                      (unsigned long) tag_value);
                  else
                    if (tag_value < 0x20000)
                      (void) FormatLocaleString(key,MaxTextExtent,"@%04lx",
                        (unsigned long) (tag_value & 0xffff));
                    else
                      (void) FormatLocaleString(key,MaxTextExtent,"unknown");
                  break;
                }
                default:
                {
                  if (level == 2)
                    (void) SubstituteString(&key,"exif:","exif:thumbnail:");
                }
              }
              p=(const char *) NULL;
              if (image->properties != (void *) NULL)
                p=(const char *) GetValueFromSplayTree((SplayTreeInfo *)
                  image->properties,key);
              if (p == (const char *) NULL)
                (void) SetImageProperty((Image *) image,key,value);
              value=DestroyString(value);
              key=DestroyString(key);
              status=MagickTrue;
            }
        }
        if ((tag_value == TAG_EXIF_OFFSET) ||
            (tag_value == TAG_INTEROP_OFFSET) || (tag_value == TAG_GPS_OFFSET))
          {
            ssize_t
              offset;
 
            offset=(ssize_t) ReadPropertySignedLong(endian,p);
            if (((size_t) offset < length) && (level < (MaxDirectoryStack-2)))
              {
                ssize_t
                  tag_offset1;
 
                tag_offset1=(ssize_t) ((tag_value == TAG_GPS_OFFSET) ? 0x10000 :
                  0);
                directory_stack[level].directory=directory;
                entry++;
                directory_stack[level].entry=entry;
                directory_stack[level].offset=tag_offset;
                level++;
                /*
                  Check for duplicate tag.
                */
                for (i=0; i < level; i++)
                  if (directory_stack[i].directory == (exif+tag_offset1))
                    break;
                if (i < level)
                  break;  /* duplicate tag */
                directory_stack[level].directory=exif+offset;
                directory_stack[level].offset=tag_offset1;
                directory_stack[level].entry=0;
                level++;
                if ((directory+2+(12*number_entries)+4) > (exif+length))
                  break;
                offset=(ssize_t) ReadPropertySignedLong(endian,directory+2+(12*
                  number_entries));
                if ((offset != 0) && ((size_t) offset < length) &&
                    (level < (MaxDirectoryStack-2)))
                  {
                    directory_stack[level].directory=exif+offset;
                    directory_stack[level].entry=0;
                    directory_stack[level].offset=tag_offset1;
                    level++;
                  }
              }
            break;
          }
    }
  } while (level > 0);
  exif_resources=DestroySplayTree(exif_resources);
  return(status);
}
 
static MagickBooleanType GetICCProperty(const Image *image)
{
  const StringInfo
    *profile;
 
  /*
    Return ICC profile property.
  */
  profile=GetImageProfile(image,"icc");
  if (profile == (StringInfo *) NULL)
    profile=GetImageProfile(image,"icm");
  if (profile == (StringInfo *) NULL)
    return(MagickFalse);
  if (GetStringInfoLength(profile) < 128)
    return(MagickFalse);  /* minimum ICC profile length */
#if defined(MAGICKCORE_LCMS_DELEGATE)
  {
    cmsHPROFILE
      icc_profile;
 
    icc_profile=cmsOpenProfileFromMem(GetStringInfoDatum(profile),
      (cmsUInt32Number) GetStringInfoLength(profile));
    if (icc_profile != (cmsHPROFILE *) NULL)
      {
#if defined(LCMS_VERSION) && (LCMS_VERSION < 2000)
        const char
          *name;
 
        name=cmsTakeProductName(icc_profile);
        if (name != (const char *) NULL)
          (void) SetImageProperty((Image *) image,"icc:name",name);
#else
        StringInfo
          *info;
 
        unsigned int
          extent;
 
        info=AcquireStringInfo(0);
        extent=cmsGetProfileInfoASCII(icc_profile,cmsInfoDescription,"en","US",
          NULL,0);
        if (extent != 0)
          {
            SetStringInfoLength(info,extent+1);
            extent=cmsGetProfileInfoASCII(icc_profile,cmsInfoDescription,"en",
              "US",(char *) GetStringInfoDatum(info),extent);
            if (extent != 0)
              (void) SetImageProperty((Image *) image,"icc:description",
                (char *) GetStringInfoDatum(info));
         }
        extent=cmsGetProfileInfoASCII(icc_profile,cmsInfoManufacturer,"en","US",
          NULL,0);
       if (extent != 0)
          {
            SetStringInfoLength(info,extent+1);
            extent=cmsGetProfileInfoASCII(icc_profile,cmsInfoManufacturer,"en",
              "US",(char *) GetStringInfoDatum(info),extent);
            if (extent != 0)
              (void) SetImageProperty((Image *) image,"icc:manufacturer",
                (char *) GetStringInfoDatum(info));
          }
        extent=cmsGetProfileInfoASCII(icc_profile,cmsInfoModel,"en","US",
          NULL,0);
        if (extent != 0)
          {
            SetStringInfoLength(info,extent+1);
            extent=cmsGetProfileInfoASCII(icc_profile,cmsInfoModel,"en","US",
              (char *) GetStringInfoDatum(info),extent);
            if (extent != 0)
              (void) SetImageProperty((Image *) image,"icc:model",
                (char *) GetStringInfoDatum(info));
          }
        extent=cmsGetProfileInfoASCII(icc_profile,cmsInfoCopyright,"en","US",
          NULL,0);
        if (extent != 0)
          {
            SetStringInfoLength(info,extent+1);
            extent=cmsGetProfileInfoASCII(icc_profile,cmsInfoCopyright,"en",
              "US",(char *) GetStringInfoDatum(info),extent);
            if (extent != 0)
              (void) SetImageProperty((Image *) image,"icc:copyright",
                (char *) GetStringInfoDatum(info));
          }
        info=DestroyStringInfo(info);
#endif
        (void) cmsCloseProfile(icc_profile);
      }
  }
#endif
  return(MagickTrue);
}
 
static MagickBooleanType SkipXMPValue(const char *value)
{
  if (value == (const char*) NULL)
    return(MagickTrue);
  while (*value != '\0')
  {
    if (isspace((int) ((unsigned char) *value)) == 0)
      return(MagickFalse);
    value++;
  }
  return(MagickTrue);
}
 
static MagickBooleanType GetXMPProperty(const Image *image,const char *property)
{
  char
    *xmp_profile;
 
  const char
    *content;
 
  const StringInfo
    *profile;
 
  ExceptionInfo
    *exception;
 
  MagickBooleanType
    status;
 
  const char
    *p;
 
  XMLTreeInfo
    *child,
    *description,
    *node,
    *rdf,
    *xmp;
 
  profile=GetImageProfile(image,"xmp");
  if (profile == (StringInfo *) NULL)
    return(MagickFalse);
  if (GetStringInfoLength(profile) < 17)
    return(MagickFalse);
  if ((property == (const char *) NULL) || (*property == '\0'))
    return(MagickFalse);
  xmp_profile=StringInfoToString(profile);
  if (xmp_profile == (char *) NULL)
    return(MagickFalse);
  for (p=xmp_profile; *p != '\0'; p++)
    if ((*p == '<') && (*(p+1) == 'x'))
      break;
  exception=AcquireExceptionInfo();
  xmp=NewXMLTree((char *) p,exception);
  xmp_profile=DestroyString(xmp_profile);
  exception=DestroyExceptionInfo(exception);
  if (xmp == (XMLTreeInfo *) NULL)
    return(MagickFalse);
  status=MagickFalse;
  rdf=GetXMLTreeChild(xmp,"rdf:RDF");
  if (rdf != (XMLTreeInfo *) NULL)
    {
      if (image->properties == (void *) NULL)
        ((Image *) image)->properties=NewSplayTree(CompareSplayTreeString,
          RelinquishMagickMemory,RelinquishMagickMemory);
      description=GetXMLTreeChild(rdf,"rdf:Description");
      while (description != (XMLTreeInfo *) NULL)
      {
        node=GetXMLTreeChild(description,(const char *) NULL);
        while (node != (XMLTreeInfo *) NULL)
        {
          char
            *xmp_namespace;
 
          child=GetXMLTreeChild(node,(const char *) NULL);
          content=GetXMLTreeContent(node);
          if ((child == (XMLTreeInfo *) NULL) &&
              (SkipXMPValue(content) == MagickFalse))
            {
              xmp_namespace=ConstantString(GetXMLTreeTag(node));
              (void) SubstituteString(&xmp_namespace,"exif:","xmp:");
              (void) AddValueToSplayTree((SplayTreeInfo *) image->properties,
                xmp_namespace,ConstantString(content));
            }
          while (child != (XMLTreeInfo *) NULL)
          {
            content=GetXMLTreeContent(child);
            if (SkipXMPValue(content) == MagickFalse)
              {
                xmp_namespace=ConstantString(GetXMLTreeTag(node));
                (void) SubstituteString(&xmp_namespace,"exif:","xmp:");
                (void) AddValueToSplayTree((SplayTreeInfo *) image->properties,
                  xmp_namespace,ConstantString(content));
              }
            child=GetXMLTreeSibling(child);
          }
          node=GetXMLTreeSibling(node);
        }
        description=GetNextXMLTreeTag(description);
      }
    }
  xmp=DestroyXMLTree(xmp);
  return(status);
}
 
static char *TracePSClippath(const unsigned char *blob,size_t length,
  const size_t magick_unused(columns),const size_t magick_unused(rows))
{
  char
    *path,
    *message;
 
  MagickBooleanType
    in_subpath;
 
  PointInfo
    first[3],
    last[3],
    point[3];
 
  ssize_t
    i,
    x;
 
  ssize_t
    knot_count,
    selector,
    y;
 
  magick_unreferenced(columns);
  magick_unreferenced(rows);
 
  path=AcquireString((char *) NULL);
  if (path == (char *) NULL)
    return((char *) NULL);
  message=AcquireString((char *) NULL);
  (void) FormatLocaleString(message,MaxTextExtent,"/ClipImage\n");
  (void) ConcatenateString(&path,message);
  (void) FormatLocaleString(message,MaxTextExtent,"{\n");
  (void) ConcatenateString(&path,message);
  (void) FormatLocaleString(message,MaxTextExtent,"  /c {curveto} bind def\n");
  (void) ConcatenateString(&path,message);
  (void) FormatLocaleString(message,MaxTextExtent,"  /l {lineto} bind def\n");
  (void) ConcatenateString(&path,message);
  (void) FormatLocaleString(message,MaxTextExtent,"  /m {moveto} bind def\n");
  (void) ConcatenateString(&path,message);
  (void) FormatLocaleString(message,MaxTextExtent,
    "  /v {currentpoint 6 2 roll curveto} bind def\n");
  (void) ConcatenateString(&path,message);
  (void) FormatLocaleString(message,MaxTextExtent,
    "  /y {2 copy curveto} bind def\n");
  (void) ConcatenateString(&path,message);
  (void) FormatLocaleString(message,MaxTextExtent,
    "  /z {closepath} bind def\n");
  (void) ConcatenateString(&path,message);
  (void) FormatLocaleString(message,MaxTextExtent,"  newpath\n");
  (void) ConcatenateString(&path,message);
  /*
    The clipping path format is defined in "Adobe Photoshop File
    Formats Specification" version 6.0 downloadable from adobe.com.
  */
  (void) memset(point,0,sizeof(point));
  (void) memset(first,0,sizeof(first));
  (void) memset(last,0,sizeof(last));
  knot_count=0;
  in_subpath=MagickFalse;
  while (length > 0)
  {
    selector=(ssize_t) ReadPropertyMSBShort(&blob,&length);
    switch (selector)
    {
      case 0:
      case 3:
      {
        if (knot_count != 0)
          {
            blob+=24;
            length-=MagickMin(24,(ssize_t) length);
            break;
          }
        /*
          Expected subpath length record.
        */
        knot_count=(ssize_t) ReadPropertyMSBShort(&blob,&length);
        blob+=22;
        length-=MagickMin(22,(ssize_t) length);
        break;
      }
      case 1:
      case 2:
      case 4:
      case 5:
      {
        if (knot_count == 0)
          {
            /*
              Unexpected subpath knot
            */
            blob+=24;
            length-=MagickMin(24,(ssize_t) length);
            break;
          }
        /*
          Add sub-path knot
        */
        for (i=0; i < 3; i++)
        {
          y=(size_t) ReadPropertyMSBLong(&blob,&length);
          x=(size_t) ReadPropertyMSBLong(&blob,&length);
          point[i].x=(double) x/4096.0/4096.0;
          point[i].y=1.0-(double) y/4096.0/4096.0;
        }
        if (in_subpath == MagickFalse)
          {
            (void) FormatLocaleString(message,MaxTextExtent,"  %g %g m\n",
              point[1].x,point[1].y);
            for (i=0; i < 3; i++)
            {
              first[i]=point[i];
              last[i]=point[i];
            }
          }
        else
          {
            /*
              Handle special cases when Bezier curves are used to describe
              corners and straight lines.
            */
            if ((last[1].x == last[2].x) && (last[1].y == last[2].y) &&
                (point[0].x == point[1].x) && (point[0].y == point[1].y))
              (void) FormatLocaleString(message,MaxTextExtent,
                "  %g %g l\n",point[1].x,point[1].y);
            else
              if ((last[1].x == last[2].x) && (last[1].y == last[2].y))
                (void) FormatLocaleString(message,MaxTextExtent,
                  "  %g %g %g %g v\n",point[0].x,point[0].y,
                  point[1].x,point[1].y);
              else
                if ((point[0].x == point[1].x) && (point[0].y == point[1].y))
                  (void) FormatLocaleString(message,MaxTextExtent,
                    "  %g %g %g %g y\n",last[2].x,last[2].y,
                    point[1].x,point[1].y);
                else
                  (void) FormatLocaleString(message,MaxTextExtent,
                    "  %g %g %g %g %g %g c\n",last[2].x,
                    last[2].y,point[0].x,point[0].y,point[1].x,point[1].y);
            for (i=0; i < 3; i++)
              last[i]=point[i];
          }
        (void) ConcatenateString(&path,message);
        in_subpath=MagickTrue;
        knot_count--;
        /*
          Close the subpath if there are no more knots.
        */
        if (knot_count == 0)
          {
            /*
              Same special handling as above except we compare to the
              first point in the path and close the path.
            */
            if ((last[1].x == last[2].x) && (last[1].y == last[2].y) &&
                (first[0].x == first[1].x) && (first[0].y == first[1].y))
              (void) FormatLocaleString(message,MaxTextExtent,
                "  %g %g l z\n",first[1].x,first[1].y);
            else
              if ((last[1].x == last[2].x) && (last[1].y == last[2].y))
                (void) FormatLocaleString(message,MaxTextExtent,
                  "  %g %g %g %g v z\n",first[0].x,first[0].y,
                  first[1].x,first[1].y);
              else
                if ((first[0].x == first[1].x) && (first[0].y == first[1].y))
                  (void) FormatLocaleString(message,MaxTextExtent,
                    "  %g %g %g %g y z\n",last[2].x,last[2].y,
                    first[1].x,first[1].y);
                else
                  (void) FormatLocaleString(message,MaxTextExtent,
                    "  %g %g %g %g %g %g c z\n",last[2].x,
                    last[2].y,first[0].x,first[0].y,first[1].x,first[1].y);
            (void) ConcatenateString(&path,message);
            in_subpath=MagickFalse;
          }
        break;
      }
      case 6:
      case 7:
      case 8:
      default:
      {
        blob+=24;
        length-=MagickMin(24,(ssize_t) length);
        break;
      }
    }
  }
  /*
    Returns an empty PS path if the path has no knots.
  */
  (void) FormatLocaleString(message,MaxTextExtent,"  eoclip\n");
  (void) ConcatenateString(&path,message);
  (void) FormatLocaleString(message,MaxTextExtent,"} bind def");
  (void) ConcatenateString(&path,message);
  message=DestroyString(message);
  return(path);
}
 
static inline void TraceBezierCurve(char *message,PointInfo *last,
  PointInfo *point)
{
  /*
    Handle special cases when Bezier curves are used to describe
    corners and straight lines.
  */
  if (((last+1)->x == (last+2)->x) && ((last+1)->y == (last+2)->y) &&
      (point->x == (point+1)->x) && (point->y == (point+1)->y))
    (void) FormatLocaleString(message,MagickPathExtent,
      "L %g %g\n",point[1].x,point[1].y);
  else
    (void) FormatLocaleString(message,MagickPathExtent,"C %g %g %g %g %g %g\n",
      (last+2)->x,(last+2)->y,point->x,point->y,(point+1)->x,(point+1)->y);
}
 
static char *TraceSVGClippath(const unsigned char *blob,size_t length,
  const size_t columns,const size_t rows)
{
  char
    *path,
    *message;
 
  MagickBooleanType
    in_subpath;
 
  PointInfo
    first[3],
    last[3],
    point[3];
 
  ssize_t
    i;
 
  ssize_t
    knot_count,
    selector,
    x,
    y;
 
  path=AcquireString((char *) NULL);
  if (path == (char *) NULL)
    return((char *) NULL);
  message=AcquireString((char *) NULL);
  (void) FormatLocaleString(message,MaxTextExtent,(
    "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>\n"
    "<svg xmlns=\"http://www.w3.org/2000/svg\""
    " width=\"%.20g\" height=\"%.20g\">\n"
    "<g>\n"
    "<path fill-rule=\"evenodd\" style=\"fill:#000000;stroke:#000000;"
    "stroke-width:0;stroke-antialiasing:false\" d=\"\n"),(double) columns,
    (double) rows);
  (void) ConcatenateString(&path,message);
  (void) memset(point,0,sizeof(point));
  (void) memset(first,0,sizeof(first));
  (void) memset(last,0,sizeof(last));
  knot_count=0;
  in_subpath=MagickFalse;
  while (length != 0)
  {
    selector=(ssize_t) ReadPropertyMSBShort(&blob,&length);
    switch (selector)
    {
      case 0:
      case 3:
      {
        if (knot_count != 0)
          {
            blob+=24;
            length-=MagickMin(24,(ssize_t) length);
            break;
          }
        /*
          Expected subpath length record.
        */
        knot_count=(ssize_t) ReadPropertyMSBShort(&blob,&length);
        blob+=22;
        length-=MagickMin(22,(ssize_t) length);
        break;
      }
      case 1:
      case 2:
      case 4:
      case 5:
      {
        if (knot_count == 0)
          {
            /*
              Unexpected subpath knot.
            */
            blob+=24;
            length-=MagickMin(24,(ssize_t) length);
            break;
          }
        /*
          Add sub-path knot.
        */
        for (i=0; i < 3; i++)
        {
          y=(ssize_t) ReadPropertyMSBLong(&blob,&length);
          x=(ssize_t) ReadPropertyMSBLong(&blob,&length);
          point[i].x=(double) x*columns/4096.0/4096.0;
          point[i].y=(double) y*rows/4096.0/4096.0;
        }
        if (in_subpath == MagickFalse)
          {
            (void) FormatLocaleString(message,MaxTextExtent,"M %g %g\n",
              point[1].x,point[1].y);
            for (i=0; i < 3; i++)
            {
              first[i]=point[i];
              last[i]=point[i];
            }
          }
        else
          {
            TraceBezierCurve(message,last,point);
            for (i=0; i < 3; i++)
              last[i]=point[i];
          }
        (void) ConcatenateString(&path,message);
        in_subpath=MagickTrue;
        knot_count--;
        /*
          Close the subpath if there are no more knots.
        */
        if (knot_count == 0)
          {
            TraceBezierCurve(message,last,first);
            (void) ConcatenateString(&path,message);
            in_subpath=MagickFalse;
          }
        break;
      }
      case 6:
      case 7:
      case 8:
      default:
      {
        blob+=24;
        length-=MagickMin(24,(ssize_t) length);
        break;
      }
    }
  }
  /*
    Return an empty SVG image if the path does not have knots.
  */
  (void) ConcatenateString(&path,"\"/>\n</g>\n</svg>\n");
  message=DestroyString(message);
  return(path);
}
 
MagickExport const char *GetImageProperty(const Image *image,
  const char *property)
{
  double
    alpha;
 
  ExceptionInfo
    *exception;
 
  FxInfo
    *fx_info;
 
  MagickStatusType
    status;
 
  const char
    *p;
 
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  p=(const char *) NULL;
  if (image->properties != (void *) NULL)
    {
      if (property == (const char *) NULL)
        {
          ResetSplayTreeIterator((SplayTreeInfo *) image->properties);
          p=(const char *) GetNextValueInSplayTree((SplayTreeInfo *)
            image->properties);
          return(p);
        }
      if (LocaleNCompare("fx:",property,3) != 0) /* NOT fx: !!!! */
        {
          p=(const char *) GetValueFromSplayTree((SplayTreeInfo *)
            image->properties,property);
          if (p != (const char *) NULL)
            return(p);
        }
    }
  if ((property == (const char *) NULL) ||
      (strchr(property,':') == (char *) NULL))
    return(p);
  exception=(&((Image *) image)->exception);
  switch (*property)
  {
    case '8':
    {
      if (LocaleNCompare("8bim:",property,5) == 0)
        {
          (void) Get8BIMProperty(image,property);
          break;
        }
      break;
    }
    case 'E':
    case 'e':
    {
      if (LocaleNCompare("exif:",property,5) == 0)
        {
          (void) GetEXIFProperty(image,property);
          break;
        }
      break;
    }
    case 'F':
    case 'f':
    {
      if (LocaleNCompare("fx:",property,3) == 0)
        {
          if ((image->columns == 0) || (image->rows == 0))
            break;
          fx_info=AcquireFxInfo(image,property+3);
          status=FxEvaluateChannelExpression(fx_info,DefaultChannels,0,0,&alpha,
            exception);
          fx_info=DestroyFxInfo(fx_info);
          if (status != MagickFalse)
            {
              char
                value[MaxTextExtent];
 
              (void) FormatLocaleString(value,MaxTextExtent,"%.*g",
                GetMagickPrecision(),(double) alpha);
              (void) SetImageProperty((Image *) image,property,value);
            }
          break;
        }
      break;
    }
    case 'H':
    case 'h':
    {
      if (LocaleNCompare("hex:",property,4) == 0)
        {
          MagickPixelPacket
            pixel;
 
          if ((image->columns == 0) || (image->rows == 0))
            break;
          GetMagickPixelPacket(image,&pixel);
          fx_info=AcquireFxInfo(image,property+4);
          status=FxEvaluateChannelExpression(fx_info,RedChannel,0,0,&alpha,
            exception);
          pixel.red=(MagickRealType) QuantumRange*alpha;
          status&=FxEvaluateChannelExpression(fx_info,GreenChannel,0,0,&alpha,
            exception);
          pixel.green=(MagickRealType) QuantumRange*alpha;
          status&=FxEvaluateChannelExpression(fx_info,BlueChannel,0,0,&alpha,
            exception);
          pixel.blue=(MagickRealType) QuantumRange*alpha;
          status&=FxEvaluateChannelExpression(fx_info,OpacityChannel,0,0,&alpha,
            exception);
          pixel.opacity=(MagickRealType) QuantumRange*(1.0-alpha);
          if (image->colorspace == CMYKColorspace)
            {
              status&=FxEvaluateChannelExpression(fx_info,BlackChannel,0,0,
                &alpha,exception);
              pixel.index=(MagickRealType) QuantumRange*alpha;
            }
          fx_info=DestroyFxInfo(fx_info);
          if (status != MagickFalse)
            {
              char
                hex[MaxTextExtent];
 
              GetColorTuple(&pixel,MagickTrue,hex);
              (void) SetImageProperty((Image *) image,property,hex+1);
            }
          break;
        }
      break;
    }
    case 'I':
    case 'i':
    {
      if ((LocaleNCompare("icc:",property,4) == 0) ||
          (LocaleNCompare("icm:",property,4) == 0))
        {
          (void) GetICCProperty(image);
          break;
        }
      if (LocaleNCompare("iptc:",property,5) == 0)
        {
          (void) GetIPTCProperty(image,property);
          break;
        }
      break;
    }
    case 'P':
    case 'p':
    {
      if (LocaleNCompare("pixel:",property,6) == 0)
        {
          MagickPixelPacket
            pixel;
 
          GetMagickPixelPacket(image,&pixel);
          fx_info=AcquireFxInfo(image,property+6);
          status=FxEvaluateChannelExpression(fx_info,RedChannel,0,0,&alpha,
            exception);
          pixel.red=(MagickRealType) QuantumRange*alpha;
          status&=FxEvaluateChannelExpression(fx_info,GreenChannel,0,0,&alpha,
            exception);
          pixel.green=(MagickRealType) QuantumRange*alpha;
          status&=FxEvaluateChannelExpression(fx_info,BlueChannel,0,0,&alpha,
            exception);
          pixel.blue=(MagickRealType) QuantumRange*alpha;
          status&=FxEvaluateChannelExpression(fx_info,OpacityChannel,0,0,&alpha,
            exception);
          pixel.opacity=(MagickRealType) QuantumRange*(1.0-alpha);
          if (image->colorspace == CMYKColorspace)
            {
              status&=FxEvaluateChannelExpression(fx_info,BlackChannel,0,0,
                &alpha,exception);
              pixel.index=(MagickRealType) QuantumRange*alpha;
            }
          fx_info=DestroyFxInfo(fx_info);
          if (status != MagickFalse)
            {
              char
                name[MaxTextExtent];
 
              const char
                *value;
 
              GetColorTuple(&pixel,MagickFalse,name);
              value=GetImageArtifact(image,"pixel:compliance");
              if (value != (char *) NULL)
                {
                  ComplianceType compliance=(ComplianceType) ParseCommandOption(
                    MagickComplianceOptions,MagickFalse,value);
                  (void) QueryMagickColorname(image,&pixel,compliance,name,
                    exception);
                }
              (void) SetImageProperty((Image *) image,property,name);
            }
          break;
        }
      break;
    }
    case 'X':
    case 'x':
    {
      if (LocaleNCompare("xmp:",property,4) == 0)
        {
          (void) GetXMPProperty(image,property);
          break;
        }
      break;
    }
    default:
      break;
  }
  if (image->properties != (void *) NULL)
    {
      p=(const char *) GetValueFromSplayTree((SplayTreeInfo *)
        image->properties,property);
      return(p);
    }
  return((const char *) NULL);
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
+   G e t M a g i c k P r o p e r t y                                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  GetMagickProperty() gets attributes or calculated values that is associated
%  with a fixed known property name, or single letter property:
%
%    \n   newline
%    \r   carriage return
%    <    less-than character.
%    >    greater-than character.
%    &    ampersand character.
%    %%   a percent sign
%    %b   file size of image read in
%    %c   comment meta-data property
%    %d   directory component of path
%    %e   filename extension or suffix
%    %f   filename (including suffix)
%    %g   layer canvas page geometry   (equivalent to "%Wx%H%X%Y")
%    %h   current image height in pixels
%    %i   image filename (note: becomes output filename for "info:")
%    %k   CALCULATED: number of unique colors
%    %l   label meta-data property
%    %m   image file format (file magic)
%    %n   number of images in current image sequence
%    %o   output filename  (used for delegates)
%    %p   index of image in current image list
%    %q   quantum depth (compile-time constant)
%    %r   image class and colorspace
%    %s   scene number (from input unless re-assigned)
%    %t   filename without directory or extension (suffix)
%    %u   unique temporary filename (used for delegates)
%    %w   current width in pixels
%    %x   x resolution (density)
%    %y   y resolution (density)
%    %z   image depth (as read in unless modified, image save depth)
%    %A   image transparency channel enabled (true/false)
%    %B   file size of image in bytes
%    %C   image compression type
%    %D   image GIF dispose method
%    %G   original image size (%wx%h; before any resizes)
%    %H   page (canvas) height
%    %M   Magick filename (original file exactly as given,  including read mods)
%    %O   page (canvas) offset ( = %X%Y )
%    %P   page (canvas) size ( = %Wx%H )
%    %Q   image compression quality ( 0 = default )
%    %S   ?? scenes ??
%    %T   image time delay (in centi-seconds)
%    %U   image resolution units
%    %W   page (canvas) width
%    %X   page (canvas) x offset (including sign)
%    %Y   page (canvas) y offset (including sign)
%    %Z   unique filename (used for delegates)
%    %@   CALCULATED: trim bounding box (without actually trimming)
%    %#   CALCULATED: 'signature' hash of image values
%
%  This does not return, special profile or property expressions. Nor does it
%  return free-form property strings, unless referenced by a single letter
%  property name.
%
%  The returned string is stored as the image artifact 'get-property' (not as
%  another property), and as such should not be freed. Later calls however
%  will overwrite this value so if needed for a longer period a copy should be
%  made.  This artifact can be deleted when no longer required.
%
%  The format of the GetMagickProperty method is:
%
%      const char *GetMagickProperty(const ImageInfo *image_info,Image *image,
%        const char *property)
%
%  A description of each parameter follows:
%
%    o image_info: the image info.
%
%    o image: the image.
%
%    o key: the key.
%
*/
static const char *GetMagickPropertyLetter(const ImageInfo *image_info,
  Image *image,const char letter)
{
#define WarnNoImageInfoReturn(format,arg) \
  if (image_info == (ImageInfo *) NULL ) { \
    (void) ThrowMagickException(&image->exception,GetMagickModule(), \
      OptionWarning,"NoImageInfoForProperty",format,arg); \
    return((const char *) NULL); \
  }
 
  char
    value[MaxTextExtent];
 
  const char
    *string;
 
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  *value='\0';
  string=(char *) NULL;
  switch (letter)
  {
    case 'b':
    {
      /*
        Image size read in - in bytes.
      */
      (void) FormatMagickSize(image->extent,MagickFalse,value);
      if (image->extent == 0)
        (void) FormatMagickSize(GetBlobSize(image),MagickFalse,value);
      break;
    }
    case 'c':
    {
      /*
        Image comment property - empty string by default.
      */
      string=GetImageProperty(image,"comment");
      if (string == (const char *) NULL)
        string="";
      break;
    }
    case 'd':
    {
      /*
        Directory component of filename.
      */
      GetPathComponent(image->magick_filename,HeadPath,value);
      if (*value == '\0')
        string="";
      break;
    }
    case 'e':
    {
      /*
        Filename extension (suffix) of image file.
      */
      GetPathComponent(image->magick_filename,ExtensionPath,value);
      if (*value == '\0')
        string="";
      break;
    }
    case 'f':
    {
      /*
        Filename without directory component.
      */
      GetPathComponent(image->magick_filename,TailPath,value);
      if (*value == '\0')
        string="";
      break;
    }
    case 'g':
    {
      /*
        Image geometry, canvas and offset  %Wx%H+%X+%Y.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20gx%.20g%+.20g%+.20g",
        (double) image->page.width,(double) image->page.height,
        (double) image->page.x,(double) image->page.y);
      break;
    }
    case 'h':
    {
      /*
        Image height (current).
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        (image->rows != 0 ? image->rows : image->magick_rows));
      break;
    }
    case 'i':
    {
      /*
        Filename last used for image (read or write).
      */
      string=image->filename;
      break;
    }
    case 'k':
    {
      /*
        Number of unique colors.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        GetNumberColors(image,(FILE *) NULL,&image->exception));
      break;
    }
    case 'l':
    {
      /*
        Image label property - empty string by default.
      */
      string=GetImageProperty(image,"label");
      if (string == (const char *) NULL)
        string="";
      break;
    }
    case 'm':
    {
      /*
        Image format (file magick).
      */
      string=image->magick;
      break;
    }
    case 'n':
    {
      /*
        Number of images in the list.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        GetImageListLength(image));
      break;
    }
    case 'o':
    {
      /*
        Output Filename - for delegate use only
      */
      WarnNoImageInfoReturn("\"%%%c\"",letter);
      string=image_info->filename;
      break;
    }
    case 'p':
    {
      /*
        Image index in current image list -- As 'n' OBSOLETE.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        GetImageIndexInList(image));
      break;
    }
    case 'q':
    {
      /*
        Quantum depth of image in memory.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        MAGICKCORE_QUANTUM_DEPTH);
      break;
    }
    case 'r':
    {
      ColorspaceType
        colorspace;
 
      /*
        Image storage class and colorspace.
      */
      colorspace=image->colorspace;
      if ((image->columns != 0) && (image->rows != 0) &&
          (SetImageGray(image,&image->exception) != MagickFalse))
        colorspace=GRAYColorspace;
      (void) FormatLocaleString(value,MaxTextExtent,"%s %s %s",
        CommandOptionToMnemonic(MagickClassOptions,(ssize_t)
        image->storage_class),CommandOptionToMnemonic(MagickColorspaceOptions,
        (ssize_t) colorspace),image->matte != MagickFalse ? "Matte" : "" );
      break;
    }
    case 's':
    {
      /*
        Image scene number.
      */
      WarnNoImageInfoReturn("\"%%%c\"",letter);
      if (image_info->number_scenes != 0)
        (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
          image_info->scene);
      else
        (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
          image->scene);
      break;
    }
    case 't':
    {
      /*
        Base filename without directory or extension.
      */
      GetPathComponent(image->magick_filename,BasePath,value);
      if (*value == '\0')
        string="";
      break;
    }
    case 'u':
    {
      /*
        Unique filename.
      */
      WarnNoImageInfoReturn("\"%%%c\"",letter);
      string=image_info->unique;
      break;
    }
    case 'w':
    {
      /*
        Image width (current).
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        (image->columns != 0 ? image->columns : image->magick_columns));
      break;
    }
    case 'x':
    {
      /*
        Image horizontal resolution.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",
        fabs(image->x_resolution) > MagickEpsilon ? image->x_resolution :
        image->units == PixelsPerCentimeterResolution ? DefaultResolution/2.54 :
        DefaultResolution);
      break;
    }
    case 'y':
    {
      /*
        Image vertical resolution.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",
        fabs(image->y_resolution) > MagickEpsilon ? image->y_resolution :
        image->units == PixelsPerCentimeterResolution ? DefaultResolution/2.54 :
        DefaultResolution);
      break;
    }
    case 'z':
    {
      /*
        Image depth.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        image->depth);
      break;
    }
    case 'A':
    {
      /*
        Image alpha channel.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%s",
         CommandOptionToMnemonic(MagickBooleanOptions,(ssize_t) image->matte));
      break;
    }
    case 'B':
    {
      /*
        Image size read in - in bytes.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        image->extent);
      if (image->extent == 0)
        (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
          GetBlobSize(image));
      break;
    }
    case 'C':
    {
      /*
        Image compression method.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%s",
        CommandOptionToMnemonic(MagickCompressOptions,(ssize_t)
          image->compression));
      break;
    }
    case 'D':
    {
      /*
        Image dispose method.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%s",
        CommandOptionToMnemonic(MagickDisposeOptions,(ssize_t) image->dispose));
      break;
    }
    case 'F':
    {
      const char
        *q;
 
      char
        *p;
 
      static const char
        allowlist[] =
          "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 "
          "$-_.+!*'(),{}|\\^~[]`\"><#%;/?:@&=";
 
      /*
        Magick filename (sanitized) - filename given incl. coder & read mods.
      */
      (void) CopyMagickString(value,image->magick_filename,MaxTextExtent);
      p=value;
      q=value+strlen(value);
      for (p+=strspn(p,allowlist); p != q; p+=(ptrdiff_t) strspn(p,allowlist))
        *p='_';
      break;
    }
    case 'G':
    {
      /*
        Image size as geometry = "%wx%h".
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20gx%.20g",(double)
        image->magick_columns,(double) image->magick_rows);
      break;
    }
    case 'H':
    {
      /*
        Layer canvas height.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        image->page.height);
      break;
    }
    case 'M':
    {
      /*
        Magick filename - filename given incl. coder & read mods.
      */
      string=image->magick_filename;
      break;
    }
    case 'N': /* Number of images in the list.  */
    {
      if ((image != (Image *) NULL) && (image->next == (Image *) NULL))
        (void) FormatLocaleString(value,MagickPathExtent,"%.20g\n",(double)
          GetImageListLength(image));
      else
        string="";
      break;
    }
    case 'O':
    {
      /*
        Layer canvas offset with sign = "+%X+%Y".
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%+ld%+ld",(long)
        image->page.x,(long) image->page.y);
      break;
    }
    case 'P':
    {
      /*
        Layer canvas page size = "%Wx%H".
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20gx%.20g",(double)
        image->page.width,(double) image->page.height);
      break;
    }
    case 'Q':
    {
      /*
        Image compression quality.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        (image->quality == 0 ? 92 : image->quality));
      break;
    }
    case 'S':
    {
      /*
        Image scenes.
      */
      WarnNoImageInfoReturn("\"%%%c\"",letter);
      if (image_info->number_scenes == 0)
        string="2147483647";
      else
        (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
          image_info->scene+image_info->number_scenes);
      break;
    }
    case 'T':
    {
      /*
        Image time delay for animations.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        image->delay);
      break;
    }
    case 'U':
    {
      /*
        Image resolution units.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%s",
        CommandOptionToMnemonic(MagickResolutionOptions,(ssize_t)
          image->units));
      break;
    }
    case 'W':
    {
      /*
        Layer canvas width.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
        image->page.width);
      break;
    }
    case 'X':
    {
      /*
        Layer canvas X offset.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%+.20g",(double)
        image->page.x);
      break;
    }
    case 'Y':
    {
      /*
        Layer canvas Y offset.
      */
      (void) FormatLocaleString(value,MaxTextExtent,"%+.20g",(double)
        image->page.y);
      break;
    }
    case 'Z':
    {
      /*
        Zero filename.
      */
      WarnNoImageInfoReturn("\"%%%c\"",letter);
      string=image_info->zero;
      break;
    }
    case '@':
    {
      RectangleInfo
        page;
 
      /*
        Image bounding box.
      */
      page=GetImageBoundingBox(image,&image->exception);
      (void) FormatLocaleString(value,MaxTextExtent,"%.20gx%.20g%+.20g%+.20g",
        (double) page.width,(double) page.height,(double) page.x,(double)
        page.y);
      break;
    }
    case '#':
    {
      /*
        Image signature.
      */
      if ((image->columns != 0) && (image->rows != 0))
        (void) SignatureImage(image);
      string=GetImageProperty(image,"signature");
      break;
    }
    case '%':
    {
      /*
        Percent escaped.
      */
      string="%";
      break;
    }
  }
  if (*value != '\0')
    string=value;
  if (string != (char *) NULL)
    {
      (void) SetImageArtifact(image,"get-property",string);
      return(GetImageArtifact(image,"get-property"));
    }
  return((char *) NULL);
}
 
MagickExport const char *GetMagickProperty(const ImageInfo *image_info,
  Image *image,const char *property)
{
  char
    value[MaxTextExtent];
 
  const char
    *string;
 
  assert(property != (const char *) NULL);
  assert(property[0] != '\0');
  if (property[1] == '\0')  /* single letter property request */
    return(GetMagickPropertyLetter(image_info,image,*property));
  *value='\0';  /* formatted string */
  string=(char *) NULL;  /* constant string reference */
  switch (*property)
  {
    case 'b':
    {
      if ((LocaleCompare("base",property) == 0) ||
          (LocaleCompare("basename",property) == 0) )
        {
          GetPathComponent(image->magick_filename,BasePath,value);
          break;
        }
      if (LocaleCompare("bit-depth",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
            GetImageDepth(image,&image->exception));
          break;
        }
      if (LocaleCompare("bounding-box",property) == 0)
        {
          RectangleInfo
            geometry;
 
          geometry=GetImageBoundingBox(image,&image->exception);
          (void) FormatLocaleString(value,MagickPathExtent,"%g,%g %g,%g\n",
            (double) geometry.x,(double) geometry.y,
            (double) geometry.x+geometry.width,
            (double) geometry.y+geometry.height);
          break;
        }
      break;
    }
    case 'c':
    {
      if (LocaleCompare("channels",property) == 0)
        {
          /*
            Image channels.
          */
          (void) FormatLocaleString(value,MaxTextExtent,"%s",
            CommandOptionToMnemonic(MagickColorspaceOptions,(ssize_t)
            image->colorspace));
          LocaleLower(value);
          if (image->matte != MagickFalse)
            (void) ConcatenateMagickString(value,"a",MaxTextExtent);
          break;
        }
      if (LocaleCompare("colors",property) == 0)
        {
          image->colors=GetNumberColors(image,(FILE *) NULL,&image->exception);
          (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
            image->colors);
          break;
        }
      if (LocaleCompare("colorspace",property) == 0)
        {
          string=CommandOptionToMnemonic(MagickColorspaceOptions,(ssize_t)
            image->colorspace);
          break;
        }
      if (LocaleCompare("compose",property) == 0)
        {
          string=CommandOptionToMnemonic(MagickComposeOptions,(ssize_t)
            image->compose);
          break;
        }
      if (LocaleCompare("compression",property) == 0)
        {
          string=CommandOptionToMnemonic(MagickCompressOptions,(ssize_t)
            image->compression);
          break;
        }
      if (LocaleCompare("copyright",property) == 0)
        {
          (void) CopyMagickString(value,GetMagickCopyright(),MaxTextExtent);
          break;
        }
      break;
    }
    case 'd':
    {
      if (LocaleCompare("depth",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
            image->depth);
          break;
        }
      if (LocaleCompare("directory",property) == 0)
        {
          GetPathComponent(image->magick_filename,HeadPath,value);
          break;
        }
      break;
    }
    case 'e':
    {
      if (LocaleCompare("entropy",property) == 0)
        {
          double
            entropy;
 
          (void) GetImageChannelEntropy(image,image_info->channel,&entropy,
            &image->exception);
          (void) FormatLocaleString(value,MaxTextExtent,"%.*g",
            GetMagickPrecision(),entropy);
          break;
        }
      if (LocaleCompare("extension",property) == 0)
        {
          GetPathComponent(image->magick_filename,ExtensionPath,value);
          break;
        }
      break;
    }
    case 'g':
    {
      if (LocaleCompare("gamma",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.*g",
            GetMagickPrecision(),image->gamma);
          break;
        }
      if ((image_info != (ImageInfo *) NULL) &&
          (LocaleCompare("group",property) == 0))
        {
          (void) FormatLocaleString(value,MaxTextExtent,"0x%lx",(unsigned long)
            image_info->group);
          break;
        }
      break;
    }
    case 'h':
    {
      if (LocaleCompare("height",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.20g",
            image->magick_rows != 0 ? (double) image->magick_rows : 256.0);
          break;
        }
      break;
    }
    case 'i':
    {
      if (LocaleCompare("input",property) == 0)
        {
          string=image->filename;
          break;
        }
      if (LocaleCompare("interlace",property) == 0)
        {
          string=CommandOptionToMnemonic(MagickInterlaceOptions,(ssize_t)
            image->interlace);
          break;
        }
      break;
    }
    case 'k':
    {
      if (LocaleCompare("kurtosis",property) == 0)
        {
          double
            kurtosis,
            skewness;
 
          (void) GetImageChannelKurtosis(image,image_info->channel,&kurtosis,
            &skewness,&image->exception);
          (void) FormatLocaleString(value,MaxTextExtent,"%.*g",
            GetMagickPrecision(),kurtosis);
          break;
        }
      break;
    }
    case 'm':
    {
      if (LocaleCompare("magick",property) == 0)
        {
          string=image->magick;
          break;
        }
      if ((LocaleCompare("max",property) == 0) ||
          (LocaleCompare("maxima",property) == 0))
        {
          double
            maximum,
            minimum;
 
          (void) GetImageChannelRange(image,image_info->channel,&minimum,
            &maximum,&image->exception);
          (void) FormatLocaleString(value,MaxTextExtent,"%.*g",
            GetMagickPrecision(),maximum);
          break;
        }
      if (LocaleCompare("mean",property) == 0)
        {
          double
            mean,
            standard_deviation;
 
          (void) GetImageChannelMean(image,image_info->channel,&mean,
            &standard_deviation,&image->exception);
          (void) FormatLocaleString(value,MaxTextExtent,"%.*g",
            GetMagickPrecision(),mean);
          break;
        }
      if ((LocaleCompare("min",property) == 0) ||
          (LocaleCompare("minima",property) == 0))
        {
          double
            maximum,
            minimum;
 
          (void) GetImageChannelRange(image,image_info->channel,&minimum,
            &maximum,&image->exception);
          (void) FormatLocaleString(value,MaxTextExtent,"%.*g",
            GetMagickPrecision(),minimum);
          break;
        }
      break;
    }
    case 'o':
    {
      if (LocaleCompare("opaque",property) == 0)
        {
          MagickBooleanType
            opaque;
 
          opaque=IsOpaqueImage(image,&image->exception);
          (void) CopyMagickString(value,opaque != MagickFalse ? "true" :
            "false",MaxTextExtent);
          break;
        }
      if (LocaleCompare("orientation",property) == 0)
        {
          string=CommandOptionToMnemonic(MagickOrientationOptions,(ssize_t)
            image->orientation);
          break;
        }
      if ((image_info != (ImageInfo *) NULL) &&
          (LocaleCompare("output",property) == 0))
        {
          (void) CopyMagickString(value,image_info->filename,MaxTextExtent);
          break;
        }
     break;
    }
    case 'p':
    {
      if (LocaleCompare("page",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.20gx%.20g",(double)
            image->page.width,(double) image->page.height);
          break;
        }
      if (LocaleNCompare("papersize:",property,10) == 0)
        {
          char
            *papersize;
 
          *value='\0';
          papersize=GetPageGeometry(property+10);
          if (papersize != (const char *) NULL)
            {
              RectangleInfo
                page = { 0, 0, 0, 0 };
 
              (void) ParseAbsoluteGeometry(papersize,&page);
              (void) FormatLocaleString(value,MaxTextExtent,"%.20gx%.20g",
                (double) page.width,(double) page.height);
              papersize=DestroyString(papersize);
            }
          break;
        }
#if defined(MAGICKCORE_LCMS_DELEGATE)
      if (LocaleCompare("profile:icc",property) == 0 ||
          LocaleCompare("profile:icm",property) == 0)
        {
#if !defined(LCMS_VERSION) || (LCMS_VERSION < 2000)
#define cmsUInt32Number  DWORD
#endif
 
          const StringInfo
            *profile;
 
          cmsHPROFILE
            icc_profile;
 
          profile=GetImageProfile(image,property+8);
          if (profile == (StringInfo *) NULL)
            break;
 
          icc_profile=cmsOpenProfileFromMem(GetStringInfoDatum(profile),
            (cmsUInt32Number) GetStringInfoLength(profile));
          if (icc_profile != (cmsHPROFILE *) NULL)
            {
#if defined(LCMS_VERSION) && (LCMS_VERSION < 2000)
              string=cmsTakeProductName(icc_profile);
#else
              (void) cmsGetProfileInfoASCII(icc_profile,cmsInfoDescription,
                "en","US",value,MaxTextExtent);
#endif
              (void) cmsCloseProfile(icc_profile);
            }
      }
#endif
      if (LocaleCompare("printsize.x",property) == 0)
        {
          (void) FormatLocaleString(value,MagickPathExtent,"%.*g",
            GetMagickPrecision(),PerceptibleReciprocal(image->x_resolution)*
              image->columns);
          break;
        }
      if (LocaleCompare("printsize.y",property) == 0)
        {
          (void) FormatLocaleString(value,MagickPathExtent,"%.*g",
            GetMagickPrecision(),PerceptibleReciprocal(image->y_resolution)*
              image->rows);
          break;
        }
      if (LocaleCompare("profiles",property) == 0)
        {
          const char
            *name;
 
          ResetImageProfileIterator(image);
          name=GetNextImageProfile(image);
          if (name != (char *) NULL)
            {
              (void) CopyMagickString(value,name,MaxTextExtent);
              name=GetNextImageProfile(image);
              while (name != (char *) NULL)
              {
                ConcatenateMagickString(value,",",MaxTextExtent);
                ConcatenateMagickString(value,name,MaxTextExtent);
                name=GetNextImageProfile(image);
              }
            }
          break;
        }
      break;
    }
    case 'q':
    {
      if (LocaleCompare("quality",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
            image->quality);
          break;
        }
      break;
    }
    case 'r':
    {
      if (LocaleCompare("rendering-intent",property) == 0)
        {
          string=CommandOptionToMnemonic(MagickIntentOptions,(ssize_t)
            image->rendering_intent);
          break;
        }
      if (LocaleCompare("resolution.x",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%g",
            image->x_resolution);
          break;
        }
      if (LocaleCompare("resolution.y",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%g",
            image->y_resolution);
          break;
        }
      break;
    }
    case 's':
    {
      if (LocaleCompare("scene",property) == 0)
        {
          if ((image_info != (ImageInfo *) NULL) &&
              (image_info->number_scenes != 0))
            (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
              image_info->scene);
          else
            (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
              image->scene);
          break;
        }
      if (LocaleCompare("scenes",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
            GetImageListLength(image));
          break;
        }
      if (LocaleCompare("size",property) == 0)
        {
          (void) FormatMagickSize(GetBlobSize(image),MagickFalse,value);
          break;
        }
      if (LocaleCompare("skewness",property) == 0)
        {
          double
            kurtosis,
            skewness;
 
          (void) GetImageChannelKurtosis(image,image_info->channel,&kurtosis,
            &skewness,&image->exception);
          (void) FormatLocaleString(value,MaxTextExtent,"%.*g",
            GetMagickPrecision(),skewness);
          break;
        }
      if ((LocaleCompare("standard-deviation",property) == 0) ||
          (LocaleCompare("standard_deviation",property) == 0))
        {
          double
            mean,
            standard_deviation;
 
          (void) GetImageChannelMean(image,image_info->channel,&mean,
            &standard_deviation,&image->exception);
          (void) FormatLocaleString(value,MaxTextExtent,"%.*g",
            GetMagickPrecision(),standard_deviation);
          break;
        }
       break;
    }
    case 't':
    {
      if (LocaleCompare("type",property) == 0)
        {
          string=CommandOptionToMnemonic(MagickTypeOptions,(ssize_t)
            IdentifyImageType(image,&image->exception));
          break;
        }
       break;
    }
    case 'u':
    {
      if ((image_info != (ImageInfo *) NULL) &&
          (LocaleCompare("unique",property) == 0))
        {
          string=image_info->unique;
          break;
        }
      if (LocaleCompare("units",property) == 0)
        {
          /*
            Image resolution units.
          */
          string=CommandOptionToMnemonic(MagickResolutionOptions,(ssize_t)
            image->units);
          break;
        }
      break;
    }
    case 'v':
    {
      if (LocaleCompare("version",property) == 0)
        {
          string=GetMagickVersion((size_t *) NULL);
          break;
        }
      break;
    }
    case 'w':
    {
      if (LocaleCompare("width",property) == 0)
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.20g",(double)
            (image->magick_columns != 0 ? image->magick_columns : 256));
          break;
        }
      break;
    }
    case 'x': /* FUTURE: Obsolete X resolution */
    {
      if ((LocaleCompare("xresolution",property) == 0) ||
          (LocaleCompare("x-resolution",property) == 0) )
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.20g",
            image->x_resolution);
          break;
        }
      break;
    }
    case 'y': /* FUTURE: Obsolete Y resolution */
    {
      if ((LocaleCompare("yresolution",property) == 0) ||
          (LocaleCompare("y-resolution",property) == 0) )
        {
          (void) FormatLocaleString(value,MaxTextExtent,"%.20g",
            image->y_resolution);
          break;
        }
      break;
    }
    case 'z':
    {
      if ((image_info != (ImageInfo *) NULL) &&
          (LocaleCompare("zero",property) == 0))
        {
          string=image_info->zero;
          break;
        }
      break;
    }
  }
  if (*value != '\0')
    string=value;
  if (string != (char *) NULL)
    {
      (void) SetImageArtifact(image,"get-property", string);
      return(GetImageArtifact(image,"get-property"));
    }
  return((char *) NULL);
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   G e t N e x t I m a g e P r o p e r t y                                   %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  GetNextImageProperty() gets the next free-form string property name.
%
%  The format of the GetNextImageProperty method is:
%
%      char *GetNextImageProperty(const Image *image)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
*/
MagickExport char *GetNextImageProperty(const Image *image)
{
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image->filename);
  if (image->properties == (void *) NULL)
    return((char *) NULL);
  return((char *) GetNextKeyInSplayTree((SplayTreeInfo *) image->properties));
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   I n t e r p r e t I m a g e P r o p e r t i e s                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  InterpretImageProperties() replaces any embedded formatting characters with
%  the appropriate image property and returns the interpreted text.
%
%  This searches for and replaces
%     \n \r \%          replaced by newline, return, and percent resp.
%     &lt; &gt; &amp;   replaced by '<', '>', '&' resp.
%     %%                replaced by percent
%
%     %x %[x]       where 'x' is a single letter prosperity, case sensitive).
%     %[type:name]  where 'type' a is special and known prefix.
%     %[name]       where 'name' is a specifically known attribute, calculated
%                   value, or a per-image property string name, or a per-image
%                   'artifact' (as generated from a global option).
%                   It may contain ':' as long as the prefix is not special.
%
%  Single letter % substitutions will only happen if the character before the
%  percent is NOT a number. But braced substitutions will always be performed.
%  This prevents the typical usage of percent in a interpreted geometry
%  argument from being substituted when the percent is a geometry flag.
%
%  If 'glob-expressions' ('*' or '?' characters) is used for 'name' it may be
%  used as a search pattern to print multiple lines of "name=value\n" pairs of
%  the associacted set of properities.
%
%  The returned string must be freed using DestroyString() by the caller.
%
%  The format of the InterpretImageProperties method is:
%
%      char *InterpretImageProperties(const ImageInfo *image_info,Image *image,
%        const char *embed_text)
%
%  A description of each parameter follows:
%
%    o image_info: the image info.
%
%    o image: the image.
%
%    o embed_text: the address of a character string containing the embedded
%      formatting characters.
%
*/
MagickExport char *InterpretImageProperties(const ImageInfo *image_info,
  Image *image,const char *embed_text)
{
#define ExtendInterpretText(string_length) \
{ \
  size_t length=(string_length); \
  if ((size_t) (q-interpret_text+length+1) >= extent) \
    { \
      extent+=length; \
      interpret_text=(char *) ResizeQuantumMemory(interpret_text,extent+ \
        MaxTextExtent,sizeof(*interpret_text)); \
      if (interpret_text == (char *) NULL) \
        { \
          if (property_info != image_info) \
            property_info=DestroyImageInfo(property_info); \
          return((char *) NULL); \
        } \
      q=interpret_text+strlen(interpret_text); \
   } \
}
 
#define AppendKeyValue2Text(key,value)\
{ \
  size_t length=strlen(key)+strlen(value)+2; \
  if ((size_t) (q-interpret_text+length+1) >= extent) \
    { \
      extent+=length; \
      interpret_text=(char *) ResizeQuantumMemory(interpret_text,extent+ \
        MaxTextExtent,sizeof(*interpret_text)); \
      if (interpret_text == (char *) NULL) \
        { \
          if (property_info != image_info) \
            property_info=DestroyImageInfo(property_info); \
          return((char *) NULL); \
        } \
      q=interpret_text+strlen(interpret_text); \
     } \
   q+=(ptrdiff_t) FormatLocaleString(q,extent,"%s=%s\n",(key),(value)); \
}
 
#define AppendString2Text(string) \
{ \
  size_t length=strlen((string)); \
  if ((size_t) (q-interpret_text+length+1) >= extent) \
    { \
      extent+=length; \
      interpret_text=(char *) ResizeQuantumMemory(interpret_text,extent+ \
        MaxTextExtent,sizeof(*interpret_text)); \
      if (interpret_text == (char *) NULL) \
        { \
          if (property_info != image_info) \
            property_info=DestroyImageInfo(property_info); \
          return((char *) NULL); \
        } \
      q=interpret_text+strlen(interpret_text); \
    } \
  (void) CopyMagickString(q,(string),extent); \
  q+=(ptrdiff_t) length; \
}
 
  char
    *interpret_text;
 
  ImageInfo
    *property_info;
 
  char
    *q;  /* current position in interpret_text */
 
  const char
    *p;  /* position in embed_text string being expanded */
 
  size_t
    extent;  /* allocated length of interpret_text */
 
  MagickBooleanType
    number;
 
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
  if (embed_text == (const char *) NULL)
    return(ConstantString(""));
  p=embed_text;
  while ((isspace((int) ((unsigned char) *p)) != 0) && (*p != '\0'))
    p++;
  if (*p == '\0')
    return(ConstantString(""));
  if ((*p == '@') && (IsPathAccessible(p+1) != MagickFalse))
    {
      /*
        Replace string from file.
      */
      if (IsRightsAuthorized(PathPolicyDomain,ReadPolicyRights,p) == MagickFalse)
        {
          errno=EPERM;
          (void) ThrowMagickException(&image->exception,GetMagickModule(),
            PolicyError,"NotAuthorized","`%s'",p);
          return(ConstantString(""));
        }
      interpret_text=FileToString(p,~0UL,&image->exception);
      if (interpret_text != (char *) NULL)
        return(interpret_text);
    }
  /*
    Translate any embedded format characters.
  */
  if (image_info != (ImageInfo *) NULL)
    property_info=(ImageInfo *) image_info;
  else
    property_info=CloneImageInfo(image_info);
  interpret_text=AcquireString(embed_text); /* new string with extra space */
  extent=MaxTextExtent;                     /* how many extra space */
  number=MagickFalse;                       /* is last char a number? */
  for (q=interpret_text; *p!='\0';
    number=(isdigit((int) ((unsigned char) *p))) ? MagickTrue : MagickFalse,p++)
  {
    /*
      Look for the various escapes, (and handle other specials).
    */
    *q='\0';
    ExtendInterpretText(MaxTextExtent);
    switch (*p)
    {
      case '\\':
      {
        switch (*(p+1))
        {
          case '\0':
            continue;
          case 'r':  /* convert to RETURN */
          {
            *q++='\r';
            p++;
            continue;
          }
          case 'n':  /* convert to NEWLINE */
          {
            *q++='\n';
            p++;
            continue;
          }
          case '\n':  /* EOL removal UNIX,MacOSX */
          {
            p++;
            continue;
          }
          case '\r':  /* EOL removal DOS,Windows */
          {
            p++;
            if (*p == '\n') /* return-newline EOL */
              p++;
            continue;
          }
          default:
          {
            p++;
            *q++=(*p);
          }
        }
        continue;
      }
      case '&':
      {
        if (LocaleNCompare("&lt;",p,4) == 0)
          {
            *q++='<';
             p+=(ptrdiff_t) 3;
          }
        else
          if (LocaleNCompare("&gt;",p,4) == 0)
            {
              *q++='>';
               p+=(ptrdiff_t) 3;
            }
          else
            if (LocaleNCompare("&amp;",p,5) == 0)
              {
                *q++='&';
                p+=(ptrdiff_t) 4;
              }
            else
              *q++=(*p);
        continue;
      }
      case '%':
        break;  /* continue to next set of handlers */
      default:
      {
        *q++=(*p);  /* any thing else is 'as normal' */
        continue;
      }
    }
    p++; /* advance beyond the percent */
    /*
      Doubled percent - or percent at end of string.
    */
    if ((*p == '\0') || (*p == '\'') || (*p == '"'))
      p--;
    if (*p == '%')
      {
        *q++='%';
        continue;
      }
    /*
      Single letter escapes %c.
    */
    if (*p != '[')
      {
        const char
          *value;
 
        /* But only if not preceeded by a number! */
        if (number != MagickFalse)
          {
            *q++='%';  /* do NOT substitute the percent */
            p--;  /* back up one */
            continue;
          }
        value=GetMagickPropertyLetter(property_info,image,*p);
        if (value != (char *) NULL)
          {
            AppendString2Text(value);
            continue;
          }
        (void) ThrowMagickException(&image->exception,GetMagickModule(),
          OptionWarning,"UnknownImageProperty","\"%%%c\"",*p);
        continue;
      }
    {
      char
        pattern[2*MaxTextExtent] = "\0";
 
      const char
        *key,
        *value;
 
      ssize_t
        len;
 
      ssize_t
        depth;
 
      /*
        Braced Percent Escape  %[...]
      */
      p++;  /* advance p to just inside the opening brace */
      depth=1;
      if ( *p == ']' )
        {
          (void) ThrowMagickException(&image->exception,GetMagickModule(),
            OptionWarning,"UnknownImageProperty","\"%%[]\"");
          break;
        }
      for (len=0; len<(MaxTextExtent-1L) && (*p != '\0');)
      {
        if ((*p == '\\') && (*(p+1) != '\0'))
          {
            /*
              Skip escaped braces within braced pattern.
            */
            pattern[len++]=(*p++);
            pattern[len++]=(*p++);
            continue;
          }
        if (*p == '[')
          depth++;
        if (*p == ']')
          depth--;
        if (depth <= 0)
          break;
        pattern[len++]=(*p++);
      }
      pattern[len]='\0';
      if (depth != 0)
        {
          /*
            Check for unmatched final ']' for "%[...]".
          */
          if (len >= 64)
            {
              pattern[61] = '.';  /* truncate string for error message */
              pattern[62] = '.';
              pattern[63] = '.';
              pattern[64] = '\0';
            }
          (void) ThrowMagickException(&image->exception,GetMagickModule(),
            OptionError,"UnbalancedBraces","\"%%[%s\"",pattern);
          interpret_text=DestroyString(interpret_text);
          if (property_info != image_info)
            property_info=DestroyImageInfo(property_info);
          return((char *) NULL);
        }
      /*
        Special Lookup Prefixes %[prefix:...]
      */
      if (LocaleNCompare("fx:",pattern,3) == 0)
        {
          double
            value;
 
          FxInfo
            *fx_info;
 
          MagickBooleanType
            status;
 
          /*
            FX - value calculator.
          */
          fx_info=AcquireFxInfo(image,pattern+3);
          status=FxEvaluateChannelExpression(fx_info,property_info->channel,0,0,
            &value,&image->exception);
          fx_info=DestroyFxInfo(fx_info);
          if (status != MagickFalse)
            {
              char
                result[MagickPathExtent];
 
              (void) FormatLocaleString(result,MagickPathExtent,"%.*g",
                GetMagickPrecision(),(double) value);
              AppendString2Text(result);
            }
          continue;
        }
      if (LocaleNCompare("option:",pattern,7) == 0)
        {
          /*
            Option - direct global option lookup (with globbing).
          */
          if (IsGlob(pattern+7) != MagickFalse)
            {
              ResetImageOptionIterator(property_info);
              while ((key=GetNextImageOption(property_info)) != (const char *) NULL)
              if (GlobExpression(key,pattern+7,MagickTrue) != MagickFalse)
                {
                  value=GetImageOption(property_info,key);
                  if (value != (const char *) NULL)
                    AppendKeyValue2Text(key,value);
                  /* else - assertion failure? key but no value! */
                }
              continue;
            }
          value=GetImageOption(property_info,pattern+7);
          if (value != (char *) NULL)
            AppendString2Text(value);
          /* else - no global option of this specifc name */
          continue;
        }
      if (LocaleNCompare("artifact:",pattern,9) == 0)
        {
          /*
            Artifact - direct image artifact lookup (with glob).
          */
          if (IsGlob(pattern+9) != MagickFalse)
            {
              ResetImageArtifactIterator(image);
              while ((key=GetNextImageArtifact(image)) != (const char *) NULL)
                if (GlobExpression(key,pattern+9,MagickTrue) != MagickFalse)
                  {
                    value=GetImageArtifact(image,key);
                    if (value != (const char *) NULL)
                      AppendKeyValue2Text(key,value);
                    /* else - assertion failure? key but no value! */
                  }
              continue;
            }
          value=GetImageArtifact(image,pattern+9);
          if (value != (char *) NULL)
            AppendString2Text(value);
          /* else - no artifact of this specifc name */
          continue;
        }
      /*
        Handle special image properties, for example:
        %[exif:...] %[fx:...] %[pixel:...].
 
        FUTURE: handle %[property:...] prefix - abort other lookups.
      */
      value=GetImageProperty(image,pattern);
      if (value != (const char *) NULL)
        {
          AppendString2Text(value);
          continue;
        }
      /*
        Handle property 'glob' patterns such as:
        %[*]  %[user:array_??] %[filename:e*]
      */
      if (IsGlob(pattern) != MagickFalse)
        {
          ResetImagePropertyIterator(image);
          while ((key=GetNextImageProperty(image)) != (const char *) NULL)
            if (GlobExpression(key,pattern,MagickTrue) != MagickFalse)
              {
                value=GetImageProperty(image,key);
                if (value != (const char *) NULL)
                  AppendKeyValue2Text(key,value);
                /* else - assertion failure? */
              }
          continue;
        }
      /*
        Look for a known property or image attribute such as
        %[basename] %[density] %[delay].  Also handles a braced single
        letter: %[b] %[G] %[g].
      */
      value=GetMagickProperty(property_info,image,pattern);
      if (value != (const char *) NULL)
        {
          AppendString2Text(value);
          continue;
        }
      /*
        Look for a per-image Artifact (user option, post-interpreted)
      */
      value=GetImageArtifact(image,pattern);
      if (value != (char *) NULL)
        {
          AppendString2Text(value);
          continue;
        }
      /*
        Look for user option of this name (should never match in CLI usage).
      */
      value=GetImageOption(property_info,pattern);
      if (value != (char *) NULL)
        {
          AppendString2Text(value);
          continue;
        }
      /*
        Failed to find any match anywhere!
      */
      if (len >= 64)
        {
          pattern[61] = '.'; /* truncate string for error message */
          pattern[62] = '.';
          pattern[63] = '.';
          pattern[64] = '\0';
        }
      (void) ThrowMagickException(&image->exception,GetMagickModule(),
        OptionWarning,"UnknownImageProperty","\"%%[%s]\"",pattern);
      /* continue */
    } /* Braced Percent Escape */
  } /* for each char in 'embed_text' */
  *q='\0';
  if (property_info != image_info)
    property_info=DestroyImageInfo(property_info);
  return(interpret_text);
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e m o v e I m a g e P r o p e r t y                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  RemoveImageProperty() removes a property from the image and returns its
%  value.
%
%  In this case the ConstantString() value returned should be freed by the
%  caller when finished.
%
%  The format of the RemoveImageProperty method is:
%
%      char *RemoveImageProperty(Image *image,const char *property)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o property: the image property.
%
*/
MagickExport char *RemoveImageProperty(Image *image,const char *property)
{
  char
    *value;
 
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image->filename);
  if (image->properties == (void *) NULL)
    return((char *) NULL);
  value=(char *) RemoveNodeFromSplayTree((SplayTreeInfo *) image->properties,
    property);
  return(value);
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e s e t I m a g e P r o p e r t y I t e r a t o r                       %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ResetImagePropertyIterator() resets the image properties iterator.  Use it
%  in conjunction with GetNextImageProperty() to iterate over all the values
%  associated with an image property.
%
%  The format of the ResetImagePropertyIterator method is:
%
%      ResetImagePropertyIterator(Image *image)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
*/
MagickExport void ResetImagePropertyIterator(const Image *image)
{
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image->filename);
  if (image->properties == (void *) NULL)
    return;
  ResetSplayTreeIterator((SplayTreeInfo *) image->properties);
}
␌
/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   S e t I m a g e P r o p e r t y                                           %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  SetImageProperty() saves the given string value either to specific known
%  attribute or to a freeform property string.
%
%  The format of the SetImageProperty method is:
%
%      MagickBooleanType SetImageProperty(Image *image,const char *property,
%        const char *value)
%
%  A description of each parameter follows:
%
%    o image: the image.
%
%    o property: the image property.
%
%    o values: the image property values.
%
*/
MagickExport MagickBooleanType SetImageProperty(Image *image,
  const char *property,const char *value)
{
  ExceptionInfo
    *exception;
 
  MagickBooleanType
    status;
 
  MagickStatusType
    flags;
 
  size_t
    property_length;
 
 
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  if (IsEventLogging() != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
      image->filename);
  if (image->properties == (void *) NULL)
    image->properties=NewSplayTree(CompareSplayTreeString,
      RelinquishMagickMemory,RelinquishMagickMemory);  /* create splay-tree */
  if (value == (const char *) NULL)
    return(DeleteImageProperty(image,property));  /* delete if NULL */
  exception=(&image->exception);
  property_length=strlen(property);
  if ((property_length > 2) && (*(property+(property_length-2)) == ':') &&
      (*(property+(property_length-1)) == '*'))
    {
      (void) ThrowMagickException(exception,GetMagickModule(),
        OptionWarning,"SetReadOnlyProperty","`%s'",property);
      return(MagickFalse);
    }
  /*
    FUTURE: These should produce 'illegal settings'
     * binary chars in p[roperty key
     * first letter must be a alphabetic
     * single letter property keys (read only)
     * known special prefix (read only, they don't get saved!)
  */
  status=MagickTrue;
  switch (*property)
  {
    case 'B':
    case 'b':
    {
      if (LocaleCompare("background",property) == 0)
        {
          (void) QueryColorDatabase(value,&image->background_color,exception);
          break;
        }
      if (LocaleCompare("bias",property) == 0)
        {
          image->bias=StringToDoubleInterval(value,(double) QuantumRange+1.0);
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    case 'C':
    case 'c':
    {
      if (LocaleCompare("colorspace",property) == 0)
        {
          ssize_t
            colorspace;
 
          colorspace=ParseCommandOption(MagickColorspaceOptions,MagickFalse,
            value);
          if (colorspace < 0)
            break;
          status=SetImageColorspace(image,(ColorspaceType) colorspace);
          break;
        }
      if (LocaleCompare("compose",property) == 0)
        {
          ssize_t
            compose;
 
          compose=ParseCommandOption(MagickComposeOptions,MagickFalse,value);
          if (compose < 0)
            break;
          image->compose=(CompositeOperator) compose;
          break;
        }
      if (LocaleCompare("compress",property) == 0)
        {
          ssize_t
            compression;
 
          compression=ParseCommandOption(MagickCompressOptions,MagickFalse,
            value);
          if (compression < 0)
            break;
          image->compression=(CompressionType) compression;
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    case 'D':
    case 'd':
    {
      if (LocaleCompare("delay",property) == 0)
        {
          GeometryInfo
            geometry_info;
 
          flags=ParseGeometry(value,&geometry_info);
          if ((flags & GreaterValue) != 0)
            {
              if (image->delay > (size_t) floor(geometry_info.rho+0.5))
                image->delay=(size_t) floor(geometry_info.rho+0.5);
            }
          else
            if ((flags & LessValue) != 0)
              {
                if ((double) image->delay < floor(geometry_info.rho+0.5))
                  image->ticks_per_second=CastDoubleToLong(
                    floor(geometry_info.sigma+0.5));
              }
            else
              image->delay=(size_t) floor(geometry_info.rho+0.5);
          if ((flags & SigmaValue) != 0)
            image->ticks_per_second=CastDoubleToLong(floor(
              geometry_info.sigma+0.5));
          break;
        }
      if (LocaleCompare("density",property) == 0)
        {
          GeometryInfo
            geometry_info;
 
          flags=ParseGeometry(value,&geometry_info);
          if ((flags & RhoValue) != 0)
            image->x_resolution=geometry_info.rho;
          image->y_resolution=image->x_resolution;
          if ((flags & SigmaValue) != 0)
            image->y_resolution=geometry_info.sigma;
        }
      if (LocaleCompare("depth",property) == 0)
        {
          image->depth=StringToUnsignedLong(value);
          break;
        }
      if (LocaleCompare("dispose",property) == 0)
        {
          ssize_t
            dispose;
 
          dispose=ParseCommandOption(MagickDisposeOptions,MagickFalse,value);
          if (dispose < 0)
            break;
          image->dispose=(DisposeType) dispose;
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    case 'G':
    case 'g':
    {
      if (LocaleCompare("gamma",property) == 0)
        {
          image->gamma=StringToDouble(value,(char **) NULL);
          break;
        }
      if (LocaleCompare("gravity",property) == 0)
        {
          ssize_t
            gravity;
 
          gravity=ParseCommandOption(MagickGravityOptions,MagickFalse,value);
          if (gravity < 0)
            break;
          image->gravity=(GravityType) gravity;
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    case 'I':
    case 'i':
    {
      if (LocaleCompare("intensity",property) == 0)
        {
          ssize_t
            intensity;
 
          intensity=ParseCommandOption(MagickPixelIntensityOptions,MagickFalse,
            value);
          if (intensity < 0)
            break;
          image->intensity=(PixelIntensityMethod) intensity;
          break;
        }
      if (LocaleCompare("interpolate",property) == 0)
        {
          ssize_t
            interpolate;
 
          interpolate=ParseCommandOption(MagickInterpolateOptions,MagickFalse,
            value);
          if (interpolate < 0)
            break;
          image->interpolate=(InterpolatePixelMethod) interpolate;
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    case 'L':
    case 'l':
    {
      if (LocaleCompare("loop",property) == 0)
        {
          image->iterations=StringToUnsignedLong(value);
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    case 'P':
    case 'p':
    {
      if (LocaleCompare("page",property) == 0)
        {
          char
            *geometry;
 
          geometry=GetPageGeometry(value);
          flags=ParseAbsoluteGeometry(geometry,&image->page);
          geometry=DestroyString(geometry);
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    case 'R':
    case 'r':
    {
      if (LocaleCompare("rendering-intent",property) == 0)
        {
          ssize_t
            rendering_intent;
 
          rendering_intent=ParseCommandOption(MagickIntentOptions,MagickFalse,
            value);
          if (rendering_intent < 0)
            break;
          image->rendering_intent=(RenderingIntent) rendering_intent;
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    case 'T':
    case 't':
    {
      if (LocaleCompare("tile-offset",property) == 0)
        {
          char
            *geometry;
 
          geometry=GetPageGeometry(value);
          flags=ParseAbsoluteGeometry(geometry,&image->tile_offset);
          geometry=DestroyString(geometry);
          break;
        }
     if (LocaleCompare("type",property) == 0)
        {
          ssize_t
            type;
 
          type=ParseCommandOption(MagickTypeOptions,MagickFalse,value);
          if (type < 0)
            return(MagickFalse);
          image->type=(ImageType) type;
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    case 'U':
    case 'u':
    {
      if (LocaleCompare("units",property) == 0)
        {
          ssize_t
            units;
 
          units=ParseCommandOption(MagickResolutionOptions,MagickFalse,value);
          if (units < 0)
            break;
          image->units=(ResolutionType) units;
          break;
        }
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
    default:
    {
      status=AddValueToSplayTree((SplayTreeInfo *) image->properties,
        ConstantString(property),ConstantString(value));
      break;
    }
  }
  return(status);
}