Image Magick

ImageMagick-6.1.1/coders/miff.c

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/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%                        M   M  IIIII  FFFFF  FFFFF                           %
%                        MM MM    I    F      F                               %
%                        M M M    I    FFF    FFF                             %
%                        M   M    I    F      F                               %
%                        M   M  IIIII  F      F                               %
%                                                                             %
%                                                                             %
%                      Read/Write MIFF Image Format.                          %
%                                                                             %
%                              Software Design                                %
%                                John Cristy                                  %
%                                 July 1992                                   %
%                                                                             %
%                                                                             %
%  Copyright 1999-2004 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                                            %
%                                                                             %
%    http://www.imagemagick.org/www/Copyright.html                            %
%                                                                             %
%  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/attribute.h"
#include "magick/blob.h"
#include "magick/blob_private.h"
#include "magick/color.h"
#include "magick/color_private.h"
#include "magick/colorspace.h"
#include "magick/constitute.h"
#include "magick/error.h"
#include "magick/error_private.h"
#include "magick/hashmap.h"
#include "magick/geometry.h"
#include "magick/image.h"
#include "magick/image_private.h"
#include "magick/list.h"
#include "magick/magick.h"
#include "magick/memory_.h"
#include "magick/monitor.h"
#include "magick/option.h"
#include "magick/profile.h"
#include "magick/static.h"
#include "magick/string_.h"
#if defined(HasZLIB)
#include "zlib.h"
#endif
#if defined(HasBZLIB)
#include "bzlib.h"
#endif

/*
  Define declarations.
*/
#define PopCharPixel(q,pixel) \
{ \
  *(q)++=(unsigned char) (pixel); \
}
#define PopLongPixel(q,pixel) \
{ \
  *(q)++=(unsigned char) ((pixel) >> 24); \
  *(q)++=(unsigned char) ((pixel) >> 16); \
  *(q)++=(unsigned char) ((pixel) >> 8); \
  *(q)++=(unsigned char) (pixel); \
}
#define PopShortPixel(q,pixel) \
{ \
  *(q)++=(unsigned char) ((pixel) >> 8); \
  *(q)++=(unsigned char) (pixel); \
}
#define PushCharPixel(pixel,p) \
{ \
  pixel=(unsigned long) (*(p)); \
  (p)++; \
}
#define PushLongPixel(pixel,p) \
{ \
  pixel=(unsigned long) \
    ((*(p) << 24) | (*((p)+1) << 16) | (*((p)+2) << 8) | *((p)+3)); \
  (p)+=4; \
}
#define PushShortPixel(pixel,p) \
{ \
  pixel=(unsigned long) ((*(p) << 8) | *((p)+1)); \
  (p)+=2; \
}

/*
  Forward declarations.
*/
static MagickBooleanType
  WriteMIFFImage(const ImageInfo *,Image *);

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   I s M I F F                                                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  IsMIFF() returns MagickTrue if the image format type, identified by the magick
%  string, is MIFF.
%
%  The format of the IsMIFF method is:
%
%      MagickBooleanType IsMIFF(const unsigned char *magick,const size_t length)
%
%  A description of each parameter follows:
%
%    o magick: This string is generally the first few bytes of an image file
%      or blob.
%
%    o length: Specifies the length of the magick string.
%
%
*/
static MagickBooleanType IsMIFF(const unsigned char *magick,const size_t length)
{
  if (length < 14)
    return(MagickFalse);
  if (LocaleNCompare((char *) magick,"id=ImageMagick",14) == 0)
    return(MagickTrue);
  return(MagickFalse);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e a d M I F F I m a g e                                                 %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  ReadMIFFImage() reads a MIFF image file and returns it.  It allocates the
%  memory necessary for the new Image structure and returns a pointer to the
%  new image.
%
%  The format of the ReadMIFFImage method is:
%
%      Image *ReadMIFFImage(const ImageInfo *image_info,
%        ExceptionInfo *exception)
%
%  Decompression code contributed by Kyle Shorter.
%
%  A description of each parameter follows:
%
%    o image: Method ReadMIFFImage returns a pointer to the image after
%      reading.  A null image is returned if there is a memory shortage or
%      if the image cannot be read.
%
%    o image_info: The image info.
%
%    o exception: return any errors or warnings in this structure.
%
%
*/

#if defined(HasBZLIB)
static void *AcquireBZIPMemory(void *context,int items,int size)
{
  return((void *) AcquireMagickMemory((size_t) (items*size)));
}
#endif

#if defined(HasZLIB)
static voidpf AcquireZIPMemory(voidpf context,unsigned int items,
  unsigned int size)
{
  return((voidpf) AcquireMagickMemory((size_t) (items*size)));
}
#endif

static inline void PushRunlengthPacket(Image *image,const unsigned long depth,
  unsigned char *pixels,size_t *length,PixelPacket *pixel,IndexPacket *index)
{
  register unsigned char
    *p;

  unsigned long
    quantum;

  p=pixels;
  if (image->storage_class == PseudoClass)
    {
      *index=0;
      switch (depth)
      {
        case 32:
        {
          *index=ConstrainColormapIndex(image,
            (*p << 24) | (*(p+1) << 16) | (*(p+2) << 8) | *(p+3));
          p+=4;
          break;
        }
        case 16:
        {
          *index=ConstrainColormapIndex(image,(*p << 8) | *(p+1));
          p+=2;
          break;
        }
        case 8:
        {
          *index=ConstrainColormapIndex(image,*p);
          p++;
          break;
        }
        default:
          (void) ThrowMagickException(&image->exception,GetMagickModule(),
            CorruptImageError,"ImageDepthNotSupported",image->filename);
      }
      *pixel=image->colormap[*index];
      switch (depth)
      {
        case 32:
        {
          if (image->matte != MagickFalse)
            {
              PushLongPixel(quantum,p);
              pixel->opacity=(Quantum) (quantum >> (depth-QuantumDepth));
            }
          break;
        }
        case 16:
        {
          if (image->matte != MagickFalse)
            {
              PushShortPixel(quantum,p);
              pixel->opacity=(Quantum) (quantum >> (depth-QuantumDepth));
            }
          break;
        }
        case 8:
        {
          if (image->matte != MagickFalse)
            {
              PushCharPixel(quantum,p);
              pixel->opacity=ScaleCharToQuantum(quantum);
            }
          break;
        }
        default:
          (void) ThrowMagickException(&image->exception,GetMagickModule(),
            CorruptImageError,"ImageDepthNotSupported",image->filename);
      }
      *length=(size_t) (*p++)+1;
      return;
    }
  switch (depth)
  {
    case 32:
    {
      PushLongPixel(quantum,p);
      pixel->red=(Quantum) (quantum >> (depth-QuantumDepth));
      PushLongPixel(quantum,p);
      pixel->green=(Quantum) (quantum >> (depth-QuantumDepth));
      PushLongPixel(quantum,p);
      pixel->blue=(Quantum) (quantum >> (depth-QuantumDepth));
      if (image->matte != MagickFalse)
        {
          PushLongPixel(quantum,p);
          pixel->opacity=(Quantum) (quantum >> (depth-QuantumDepth));
        }
      if (image->colorspace == CMYKColorspace)
        {
          PushLongPixel(quantum,p);
          *index=(IndexPacket) (quantum >> (depth-QuantumDepth));
        }
      break;
    }
    case 16:
    {
      PushShortPixel(quantum,p);
      pixel->red=(Quantum) (quantum >> (depth-QuantumDepth));
      PushShortPixel(quantum,p);
      pixel->green=(Quantum) (quantum >> (depth-QuantumDepth));
      PushShortPixel(quantum,p);
      pixel->blue=(Quantum) (quantum >> (depth-QuantumDepth));
      if (image->matte != MagickFalse)
        {
          PushShortPixel(quantum,p);
          pixel->opacity=(Quantum) (quantum >> (depth-QuantumDepth));
        }
      if (image->colorspace == CMYKColorspace)
        {
          PushShortPixel(quantum,p);
          *index=(IndexPacket) (quantum >> (depth-QuantumDepth));
        }
      break;
    }
    case 8:
    {
      PushCharPixel(quantum,p);
      pixel->red=ScaleCharToQuantum(quantum);
      PushCharPixel(quantum,p);
      pixel->green=ScaleCharToQuantum(quantum);
      PushCharPixel(quantum,p);
      pixel->blue=ScaleCharToQuantum(quantum);
      if (image->matte != MagickFalse)
        {
          PushCharPixel(quantum,p);
          pixel->opacity=ScaleCharToQuantum(quantum);
        }
      if (image->colorspace == CMYKColorspace)
        {
          PushCharPixel(quantum,p);
          *index=ScaleCharToQuantum(quantum);
        }
      break;
    }
    default:
      (void) ThrowMagickException(&image->exception,GetMagickModule(),
        CorruptImageError,"ImageDepthNotSupported",image->filename);
  }
  *length=(size_t) (*p++)+1;
}

#if defined(HasZLIB)
static void RelinquishZIPMemory(voidpf context,voidpf memory)
{
  memory=RelinquishMagickMemory(memory);
}
#endif

#if defined(HasBZLIB)
static void RelinquishBZIPMemory(void *context,void *memory)
{
  memory=RelinquishMagickMemory(memory);
}
#endif

static Image *ReadMIFFImage(const ImageInfo *image_info,
  ExceptionInfo *exception)
{
#define BZipMaxExtent(x)  ((x)+((x)/100)+600)
#define ZipMaxExtent(x)  ((x)+(((x)+7) >> 3)+(((x)+63) >> 6)+11)

#if defined(HasBZLIB)
  bz_stream
    bzip_info;
#endif

  char
    id[MaxTextExtent],
    keyword[MaxTextExtent],
    *options;

  double
    version;

  GeometryInfo
    geometry_info;

  Image
    *image;

  IndexPacket
    index;

  int
    c,
    code;

  LinkedListInfo
    *profiles;

  long
    y;

  PixelPacket
    pixel;

  QuantumType
    quantum_type;

  MagickBooleanType
    status;

  MagickStatusType
    flags;

  register IndexPacket
    *indexes;

  register long
    i,
    x;

  register PixelPacket
    *q;

  register unsigned char
    *p;

  size_t
    length,
    packet_size;

  StringInfo
    *profile;

  unsigned char
    *compress_pixels,
    *pixels;

  unsigned long
    colors,
    depth;

#if defined(HasZLIB)
  z_stream
    zip_info;
#endif

  /*
    Open image file.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickSignature);
  if (image_info->debug != MagickFalse)
    (void) LogMagickEvent(TraceEvent,GetMagickModule(),image_info->filename);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickSignature);
  image=AllocateImage(image_info);
  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
  if (status == MagickFalse)
    {
      DestroyImageList(image);
      return((Image *) NULL);
    }
  /*
    Decode image header;  header terminates one character beyond a ':'.
  */
  c=ReadBlobByte(image);
  if (c == EOF)
    ThrowReaderException(CorruptImageError,"ImproperImageHeader");
  code=0;
  *id='\0';
  version=0.0;
  do
  {
    /*
      Decode image header;  header terminates one character beyond a ':'.
    */
    length=MaxTextExtent;
    options=AcquireString((char *) NULL);
    profiles=(LinkedListInfo *) NULL;
    colors=0;
    image->depth=8UL;
    image->compression=NoCompression;
    while ((isgraph(c) != MagickFalse) && (c != (int) ':'))
    {
      register char
        *p;

      if (c == (int) '{')
        {
          char
            *comment;

          /*
            Read comment-- any text between { }.
          */
          length=MaxTextExtent;
          comment=AcquireString((char *) NULL);
          for (p=comment; comment != (char *) NULL; p++)
          {
            c=ReadBlobByte(image);
            if ((c == EOF) || (c == (int) '}'))
              break;
            if ((size_t) (p-comment+1) >= length)
              {
                *p='\0';
                length<<=1;
                comment=(char *) ResizeMagickMemory(comment,
                  (length+MaxTextExtent)*sizeof(*comment));
                if (comment == (char *) NULL)
                  break;
                p=comment+strlen(comment);
              }
            *p=(char) c;
          }
          if (comment == (char *) NULL)
            ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
          *p='\0';
          (void) SetImageAttribute(image,"Comment",comment);
          comment=(char *) RelinquishMagickMemory(comment);
          c=ReadBlobByte(image);
        }
      else
        if (isalnum(c) != MagickFalse)
          {
            /*
              Get the keyword.
            */
            p=keyword;
            do
            {
              if (isspace((int) ((unsigned char) c)) != 0)
                break;
              if (c == (int) '=')
                break;
              if ((size_t) (p-keyword) < (MaxTextExtent-1))
                *p++=(char) c;
              c=ReadBlobByte(image);
            } while (c != EOF);
            *p='\0';
            p=options;
            while (isspace((int) ((unsigned char) c)) != 0)
              c=ReadBlobByte(image);
            if (c == (int) '=')
              {
                /*
                  Get the keyword value.
                */
                c=ReadBlobByte(image);
                while ((c != (int) '}') && (c != EOF))
                {
                  if ((size_t) (p-options+1) >= length)
                    {
                      *p='\0';
                      length<<=1;
                      options=(char *) ResizeMagickMemory(options,
                        (length+MaxTextExtent)*sizeof(*options));
                      if (options == (char *) NULL)
                        break;
                      p=options+strlen(options);
                    }
                  if (options == (char *) NULL)
                    ThrowReaderException(ResourceLimitError,
                      "MemoryAllocationFailed");
                  *p++=(char) c;
                  c=ReadBlobByte(image);
                  if (*options != '{')
                    if (isspace((int) ((unsigned char) c)) != 0)
                      break;
                }
              }
            *p='\0';
            if (*options == '{')
              (void) CopyMagickString(options,options+1,MaxTextExtent);
            /*
              Assign a value to the specified keyword.
            */
            switch (*keyword)
            {
              case 'b':
              case 'B':
              {
                if (LocaleCompare(keyword,"background-color") == 0)
                  {
                    (void) QueryColorDatabase(options,&image->background_color,
                      exception);
                    break;
                  }
                if (LocaleCompare(keyword,"blue-primary") == 0)
                  {
                    flags=ParseGeometry(options,&geometry_info);
                    image->chromaticity.blue_primary.x=geometry_info.rho;
                    image->chromaticity.blue_primary.y=geometry_info.sigma;
                    if ((flags & SigmaValue) == 0)
                      image->chromaticity.blue_primary.y=
                        image->chromaticity.blue_primary.x;
                    break;
                  }
                if (LocaleCompare(keyword,"border-color") == 0)
                  {
                    (void) QueryColorDatabase(options,&image->border_color,
                      exception);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'c':
              case 'C':
              {
                if (LocaleCompare(keyword,"class") == 0)
                  {
                    image->storage_class=(ClassType)
                      ParseMagickOption(MagickClassOptions,MagickFalse,options);
                    break;
                  }
                if (LocaleCompare(keyword,"colors") == 0)
                  {
                    colors=(unsigned long) atol(options);
                    break;
                  }
                if (LocaleCompare(keyword,"colorspace") == 0)
                  {
                    image->colorspace=(ColorspaceType) ParseMagickOption(
                      MagickColorspaceOptions,MagickFalse,options);
                    break;
                  }
                if (LocaleCompare(keyword,"compose") == 0)
                  {
                    image->compose=(CompositeOperator) ParseMagickOption(
                      MagickCompositeOptions,MagickFalse,options);
                    break;
                  }
                if (LocaleCompare(keyword,"compression") == 0)
                  {
                    image->compression=(CompressionType) ParseMagickOption(
                      MagickCompressionOptions,MagickFalse,options);
                    break;
                  }
                if (LocaleCompare(keyword,"columns") == 0)
                  {
                    image->columns=(unsigned long) atol(options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'd':
              case 'D':
              {
                if (LocaleCompare(keyword,"delay") == 0)
                  {
                    image->delay=(unsigned long) atol(options);
                    break;
                  }
                if (LocaleCompare(keyword,"depth") == 0)
                  {
                    image->depth=(unsigned long) atol(options);
                    break;
                  }
                if (LocaleCompare(keyword,"dispose") == 0)
                  {
                    image->dispose=(DisposeType) ParseMagickOption(
                      MagickDisposeOptions,MagickFalse,options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'e':
              case 'E':
              {
                if (LocaleCompare(keyword,"endian") == 0)
                  {
                    image->endian=(EndianType) ParseMagickOption(
                      MagickEndianOptions,MagickFalse,options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'g':
              case 'G':
              {
                if (LocaleCompare(keyword,"gamma") == 0)
                  {
                    image->gamma=atof(options);
                    break;
                  }
                if (LocaleCompare(keyword,"green-primary") == 0)
                  {
                    flags=ParseGeometry(options,&geometry_info);
                    image->chromaticity.green_primary.x=geometry_info.rho;
                    image->chromaticity.green_primary.y=geometry_info.sigma;
                    if ((flags & SigmaValue) == 0)
                      image->chromaticity.green_primary.y=
                        image->chromaticity.green_primary.x;
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'i':
              case 'I':
              {
                if (LocaleCompare(keyword,"id") == 0)
                  {
                    (void) CopyMagickString(id,options,MaxTextExtent);
                    break;
                  }
                if (LocaleCompare(keyword,"iterations") == 0)
                  {
                    image->iterations=(unsigned long) atol(options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'm':
              case 'M':
              {
                if (LocaleCompare(keyword,"matte") == 0)
                  {
                    image->matte=(MagickBooleanType) ParseMagickOption(
                      MagickBooleanOptions,MagickFalse,options);
                    break;
                  }
                if (LocaleCompare(keyword,"matte-color") == 0)
                  {
                    (void) QueryColorDatabase(options,&image->matte_color,
                      exception);
                    break;
                  }
                if (LocaleCompare(keyword,"montage") == 0)
                  {
                    (void) CloneString(&image->montage,options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'o':
              case 'O':
              {
                if (LocaleCompare(keyword,"opaque") == 0)
                  {
                    image->matte=(MagickBooleanType) ParseMagickOption(
                      MagickBooleanOptions,MagickFalse,options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'p':
              case 'P':
              {
                if (LocaleCompare(keyword,"page") == 0)
                  {
                    char
                      *geometry;

                    geometry=GetPageGeometry(options);
                    (void) ParseAbsoluteGeometry(geometry,&image->page);
                    geometry=(char *) RelinquishMagickMemory(geometry);
                    break;
                  }
                if (LocaleNCompare(keyword,"profile-",8) == 0)
                  {
                    if (profiles == (LinkedListInfo *) NULL)
                      profiles=NewLinkedList(0);
                    (void) AppendElementToLinkedList(profiles,
                      AcquireString(keyword+8));
                    profile=AcquireStringInfo((size_t) atol(options));
                    (void) SetImageProfile(image,keyword+8,profile);
                    profile=DestroyStringInfo(profile);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'r':
              case 'R':
              {
                if (LocaleCompare(keyword,"red-primary") == 0)
                  {
                    flags=ParseGeometry(options,&geometry_info);
                    image->chromaticity.red_primary.x=geometry_info.rho;
                    image->chromaticity.red_primary.y=geometry_info.sigma;
                    if ((flags & SigmaValue) == 0)
                      image->chromaticity.red_primary.y=
                        image->chromaticity.red_primary.x;
                    break;
                  }
                if (LocaleCompare(keyword,"rendering-intent") == 0)
                  {
                    image->rendering_intent=(RenderingIntent)
                      ParseMagickOption(MagickIntentOptions,MagickFalse,options);
                    break;
                  }
                if (LocaleCompare(keyword,"resolution") == 0)
                  {
                    flags=ParseGeometry(options,&geometry_info);
                    image->x_resolution=geometry_info.rho;
                    image->y_resolution=geometry_info.sigma;
                    if ((flags & SigmaValue) == 0)
                      image->y_resolution=image->x_resolution;
                    break;
                  }
                if (LocaleCompare(keyword,"rows") == 0)
                  {
                    image->rows=(unsigned long) atol(options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 's':
              case 'S':
              {
                if (LocaleCompare(keyword,"scene") == 0)
                  {
                    image->scene=(unsigned long) atol(options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'u':
              case 'U':
              {
                if (LocaleCompare(keyword,"units") == 0)
                  {
                    image->units=(ResolutionType) ParseMagickOption(
                      MagickResolutionOptions,MagickFalse,options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'v':
              case 'V':
              {
                if (LocaleCompare(keyword,"version") == 0)
                  {
                    version=atof(options);
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              case 'w':
              case 'W':
              {
                if (LocaleCompare(keyword,"white-point") == 0)
                  {
                    flags=ParseGeometry(options,&geometry_info);
                    image->chromaticity.white_point.x=geometry_info.rho;
                    image->chromaticity.white_point.y=geometry_info.rho;
                    if ((flags & SigmaValue) != 0)
                      image->chromaticity.white_point.y=
                        image->chromaticity.white_point.x;
                    break;
                  }
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
              default:
              {
                (void) SetImageAttribute(image,keyword,options);
                break;
              }
            }
          }
        else
          c=ReadBlobByte(image);
      while (isspace((int) ((unsigned char) c)) != 0)
        c=ReadBlobByte(image);
    }
    options=(char *) RelinquishMagickMemory(options);
    (void) ReadBlobByte(image);
    /*
      Verify that required image information is defined.
    */
    if ((LocaleCompare(id,"ImageMagick") != 0) ||
        (image->storage_class == UndefinedClass) ||
        (image->columns == 0) || (image->rows == 0))
      ThrowReaderException(CorruptImageError,"ImproperImageHeader");
    if (image->montage != (char *) NULL)
      {
        register char
          *p;

        /*
          Image directory.
        */
        length=MaxTextExtent;
        image->directory=AcquireString((char *) NULL);
        p=image->directory;
        do
        {
          *p='\0';
          if ((strlen(image->directory)+MaxTextExtent) >= length)
            {
              /*
                Allocate more memory for the image directory.
              */
              length<<=1;
              image->directory=(char *) ResizeMagickMemory(image->directory,
                (length+MaxTextExtent)*sizeof(*image->directory));
              if (image->directory == (char *) NULL)
                ThrowReaderException(CorruptImageError,"UnableToReadImageData");
              p=image->directory+strlen(image->directory);
            }
          c=ReadBlobByte(image);
          *p++=(char) c;
        } while (c != (int) '\0');
      }
    if (profiles != (LinkedListInfo *) NULL)
      {
        const char
          *name;

        /*
          Read image profiles.
        */
        ResetLinkedListIterator(profiles);
        name=(const char *) GetNextElementInLinkedList(profiles);
        while (name != (const char *) NULL)
        {
          profile=GetImageProfile(image,name);
          (void) ReadBlob(image,profile->length,profile->datum);
          name=(const char *) GetNextElementInLinkedList(profiles);
        }
        profiles=DestroyLinkedList(profiles,RelinquishMagickMemory);
      }
    depth=GetImageQuantumDepth(image,MagickFalse);
    if (image->storage_class == PseudoClass)
      {
        /*
          Create image colormap.
        */
        status=AllocateImageColormap(image,colors != 0 ? colors : 256);
        if (status == MagickFalse)
          ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
        if (colors != 0)
          {
            size_t
              packet_size;

            unsigned char
              *colormap;

            unsigned long
              pixel;

            /*
              Read image colormap from file.
            */
            packet_size=(size_t) (3*depth/8);
            colormap=(unsigned char *)
              AcquireMagickMemory(packet_size*image->colors);
            if (colormap == (unsigned char *) NULL)
              ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
            (void) ReadBlob(image,packet_size*image->colors,colormap);
            p=colormap;
            switch (depth)
            {
              default:
                ThrowReaderException(CorruptImageError,
                  "ImageDepthNotSupported");
              case 8:
              {
                for (i=0; i < (long) image->colors; i++)
                {
                  PushCharPixel(pixel,p);
                  image->colormap[i].red=ScaleCharToQuantum(pixel);
                  PushCharPixel(pixel,p);
                  image->colormap[i].green=ScaleCharToQuantum(pixel);
                  PushCharPixel(pixel,p);
                  image->colormap[i].blue=ScaleCharToQuantum(pixel);
                }
                break;
              }
              case 16:
              {
                for (i=0; i < (long) image->colors; i++)
                {
                  PushShortPixel(pixel,p);
                  image->colormap[i].red=ScaleShortToQuantum(pixel);
                  PushShortPixel(pixel,p);
                  image->colormap[i].green=ScaleShortToQuantum(pixel);
                  PushShortPixel(pixel,p);
                  image->colormap[i].blue=ScaleShortToQuantum(pixel);
                }
                break;
              }
              case 32:
              {
                for (i=0; i < (long) image->colors; i++)
                {
                  PushLongPixel(pixel,p);
                  image->colormap[i].red=ScaleLongToQuantum(pixel);
                  PushLongPixel(pixel,p);
                  image->colormap[i].green=ScaleLongToQuantum(pixel);
                  PushLongPixel(pixel,p);
                  image->colormap[i].blue=ScaleLongToQuantum(pixel);
                }
                break;
              }
            }
            colormap=(unsigned char *) RelinquishMagickMemory(colormap);
          }
      }
    if ((image_info->ping != MagickFalse) && (image_info->number_scenes != 0))
      if (image->scene >= (image_info->scene+image_info->number_scenes-1))
        break;
    /*
      Allocate image pixels.
    */
    packet_size=(size_t) (depth/8);
    if (image->storage_class == DirectClass)
      packet_size=(size_t) (3*depth/8);
    if (image->matte != MagickFalse)
      packet_size+=depth/8;
    if (image->colorspace == CMYKColorspace)
      packet_size+=depth/8;
    if (image->compression == RLECompression)
      packet_size++;
    length=packet_size*image->columns;
    pixels=(unsigned char *) AcquireMagickMemory(packet_size*image->columns);
    length=(size_t) Max(BZipMaxExtent(packet_size*image->columns),
      ZipMaxExtent(packet_size*image->columns));
    compress_pixels=(unsigned char *) AcquireMagickMemory(length);
    if ((pixels == (unsigned char *) NULL) ||
        (compress_pixels == (unsigned char *) NULL))
      ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
    /*
      Read image pixels.
    */
    quantum_type=RGBQuantum;
    if (image->storage_class == PseudoClass)
      quantum_type=image->matte != MagickFalse ? IndexAlphaQuantum :
        IndexQuantum;
    else
      if (image->colorspace == CMYKColorspace)
        quantum_type=image->matte != MagickFalse ? CMYKAQuantum : CMYKQuantum;
      else
        quantum_type=image->matte != MagickFalse ? RGBAQuantum : RGBQuantum;
    index=0;
    length=0;
    for (y=0; y < (long) image->rows; y++)
    {
      q=SetImagePixels(image,0,y,image->columns,1);
      if (q == (PixelPacket *) NULL)
        break;
      indexes=GetIndexes(image);
      switch (image->compression)
      {
#if defined(HasZLIB)
        case ZipCompression:
        {
          if (y == 0)
            {
              zip_info.zalloc=AcquireZIPMemory;
              zip_info.zfree=RelinquishZIPMemory;
              zip_info.opaque=(voidpf) NULL;
              code=inflateInit(&zip_info);
              if (code >= 0)
                status=MagickTrue;
              zip_info.avail_in=0;
            }
          zip_info.next_out=pixels;
          zip_info.avail_out=(uInt) (packet_size*image->columns);
          do
          {
            if (zip_info.avail_in == 0)
              {
                zip_info.next_in=compress_pixels;
                length=(size_t) ZipMaxExtent(packet_size*image->columns);
                if (version != 0)
                  length=(size_t) ReadBlobMSBLong(image);
                zip_info.avail_in=(unsigned int)
                  ReadBlob(image,length,zip_info.next_in);
              }
            if (inflate(&zip_info,Z_NO_FLUSH) == Z_STREAM_END)
              break;
          } while (zip_info.avail_out != 0);
          if (y == (long) (image->rows-1))
            {
              if (version == 0)
                (void) SeekBlob(image,-((MagickOffsetType) zip_info.avail_in),
                  SEEK_CUR);
              code=inflateEnd(&zip_info);
              if (code >= 0)
                status=MagickTrue;
            }
          (void) PushImagePixels(image,quantum_type,pixels);
          break;
        }
#endif
#if defined(HasBZLIB)
        case BZipCompression:
        {
          if (y == 0)
            {
              bzip_info.bzalloc=AcquireBZIPMemory;
              bzip_info.bzfree=RelinquishBZIPMemory;
              bzip_info.opaque=(void *) NULL;
              code=BZ2_bzDecompressInit(&bzip_info,(int) image_info->verbose,
                MagickFalse);
              if (code >= 0)
                status=MagickTrue;
              bzip_info.avail_in=0;
            }
          bzip_info.next_out=(char *) pixels;
          bzip_info.avail_out=(unsigned int) (packet_size*image->columns);
          do
          {
            if (bzip_info.avail_in == 0)
              {
                bzip_info.next_in=(char *) compress_pixels;
                length=(size_t) BZipMaxExtent(packet_size*image->columns);
                if (version != 0)
                  length=(size_t) ReadBlobMSBLong(image);
                bzip_info.avail_in=(unsigned int)
                  ReadBlob(image,length,(unsigned char *) bzip_info.next_in);
              }
            if (BZ2_bzDecompress(&bzip_info) == BZ_STREAM_END)
              break;
          } while (bzip_info.avail_out != 0);
          if (y == (long) (image->rows-1))
            {
              if (version == 0)
                (void) SeekBlob(image,-((MagickOffsetType) bzip_info.avail_in),
                  SEEK_CUR);
              code=BZ2_bzDecompressEnd(&bzip_info);
              if (code >= 0)
                status=MagickTrue;
            }
          (void) PushImagePixels(image,quantum_type,pixels);
          break;
        }
#endif
        case RLECompression:
        {
          if (y == 0)
            {
              (void) ResetMagickMemory(&pixel,0,sizeof(pixel));
              pixel.opacity=TransparentOpacity;
              index=0;
            }
          for (x=0; x < (long) image->columns; x++)
          {
            if (length == 0)
              {
                (void) ReadBlob(image,packet_size,pixels);
                PushRunlengthPacket(image,depth,pixels,&length,&pixel,&index);
              }
            length--;
            if ((image->storage_class == PseudoClass) ||
                (image->colorspace == CMYKColorspace))
              indexes[x]=index;
            *q++=pixel;
          }
          break;
        }
        default:
        {
          (void) ReadBlob(image,packet_size*image->columns,pixels);
          (void) PushImagePixels(image,quantum_type,pixels);
          break;
        }
      }
      if (SyncImagePixels(image) == MagickFalse)
        break;
    }
    pixels=(unsigned char *) RelinquishMagickMemory(pixels);
    compress_pixels=(unsigned char *) RelinquishMagickMemory(compress_pixels);
    if (((y != (long) image->rows)) || (status == MagickFalse))
      {
        DestroyImageList(image);
        return((Image *) NULL);
      }
    if (EOFBlob(image) != MagickFalse)
      {
        ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
          image->filename);
        break;
      }
    /*
      Proceed to next image.
    */
    if (image_info->number_scenes != 0)
      if (image->scene >= (image_info->scene+image_info->number_scenes-1))
        break;
    do
    {
      c=ReadBlobByte(image);
    } while ((isgraph(c) == MagickFalse) && (c != EOF));
    if (c != EOF)
      {
        /*
          Allocate next image structure.
        */
        AllocateNextImage(image_info,image);
        if (image->next == (Image *) NULL)
          {
            DestroyImageList(image);
            return((Image *) NULL);
          }
        image=SyncNextImageInList(image);
        if (image->progress_monitor != (MagickProgressMonitor) NULL)
          {
            status=image->progress_monitor(LoadImagesTag,TellBlob(image),
              GetBlobSize(image),image->client_data);
            if (status == MagickFalse)
              break;
          }
      }
  } while (c != EOF);
  CloseBlob(image);
  return(GetFirstImageInList(image));
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   R e g i s t e r M I F F I m a g e                                         %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  RegisterMIFFImage() adds attributes for the MIFF image format to the list of
%  supported formats.  The attributes include the image format tag, a method to
%  read and/or write the format, whether the format supports the saving of more
%  than one frame to the same file or blob, whether the format supports native
%  in-memory I/O, and a brief description of the format.
%
%  The format of the RegisterMIFFImage method is:
%
%      RegisterMIFFImage(void)
%
*/
ModuleExport void RegisterMIFFImage(void)
{
  char
    version[MaxTextExtent];

  MagickInfo
    *entry;

  *version='\0';
#if defined(MagickLibVersionText)
  (void) CopyMagickString(version,MagickLibVersionText,MaxTextExtent);
#if defined(ZLIB_VERSION)
  (void) ConcatenateMagickString(version," with Zlib ",MaxTextExtent);
  (void) ConcatenateMagickString(version,ZLIB_VERSION,MaxTextExtent);
#endif
#if defined(HasBZLIB)
  (void) ConcatenateMagickString(version," and BZlib",MaxTextExtent);
#endif
#endif
  entry=SetMagickInfo("MIFF");
  entry->decoder=(DecoderHandler *) ReadMIFFImage;
  entry->encoder=(EncoderHandler *) WriteMIFFImage;
  entry->magick=(MagickHandler *) IsMIFF;
  entry->description=AcquireString("Magick Image File Format");
  if (*version != '\0')
    entry->version=AcquireString(version);
  entry->module=AcquireString("MIFF");
  (void) RegisterMagickInfo(entry);
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   U n r e g i s t e r M I F F I m a g e                                     %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  UnregisterMIFFImage() removes format registrations made by the MIFF module
%  from the list of supported formats.
%
%  The format of the UnregisterMIFFImage method is:
%
%      UnregisterMIFFImage(void)
%
*/
ModuleExport void UnregisterMIFFImage(void)
{
  (void) UnregisterMagickInfo("MIFF");
}

/*
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%                                                                             %
%                                                                             %
%                                                                             %
%   W r i t e M I F F I m a g e                                               %
%                                                                             %
%                                                                             %
%                                                                             %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
%  WriteMIFFImage() writes a MIFF image to a file.
%
%  The format of the WriteMIFFImage method is:
%
%      MagickBooleanType WriteMIFFImage(const ImageInfo *image_info,Image *image)
%
%  Compression code contributed by Kyle Shorter.
%
%  A description of each parameter follows:
%
%    o image_info: The image info.
%
%    o image: The image.
%
%
*/

static inline size_t PopRunlengthPacket(Image *image,const unsigned long depth,
  unsigned char *pixels,size_t length,PixelPacket pixel,IndexPacket index)
{
  register unsigned char
    *q;

  unsigned long
    value;

  q=pixels;
  if (image->storage_class != DirectClass)
    {
      switch (depth)
      {
        case 32:
        {
          *q++=(unsigned char) (index >> 24);
          *q++=(unsigned char) (index >> 16);
        }
        case 16:
          *q++=(unsigned char) (index >> 8);
        case 8:
        {
          *q++=(unsigned char) index;
          break;
        }
        default:
          (void) ThrowMagickException(&image->exception,GetMagickModule(),
            CorruptImageError,"ImageDepthNotSupported",image->filename);
      }
      switch (depth)
      {
        case 32:
        {
          if (image->matte != MagickFalse)
            {
              value=ScaleQuantumToLong(pixel.opacity);
              PopLongPixel(q,value);
            }
          break;
        }
        case 16:
        {
          if (image->matte != MagickFalse)
            {
              value=ScaleQuantumToShort(pixel.opacity);
              PopShortPixel(q,value);
            }
          break;
        }
        case 8:
        {
          if (image->matte != MagickFalse)
            {
              value=(unsigned long) ScaleQuantumToChar(pixel.opacity);
              PopCharPixel(q,value);
            }
          break;
        }
        default:
          (void) ThrowMagickException(&image->exception,GetMagickModule(),
            CorruptImageError,"ImageDepthNotSupported",image->filename);
      }
      *q++=(unsigned