/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%                            M   M   AAA    CCCC                              %

%                            MM MM  A   A  C                                  %

%                            M M M  AAAAA  C                                  %

%                            M   M  A   A  C                                  %

%                            M   M  A   A   CCCC                              %

%                                                                             %

%                                                                             %

%                         Read MacPaint Image Format                          %

%                                                                             %

%                              Software Design                                %

%                                   Cristy                                    %

%                                 July 1992                                   %

%                                                                             %

%                                                                             %

%  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 "MagickCore/studio.h"

#include "MagickCore/blob.h"

#include "MagickCore/blob-private.h"

#include "MagickCore/cache.h"

#include "MagickCore/colormap.h"

#include "MagickCore/colorspace.h"

#include "MagickCore/exception.h"

#include "MagickCore/exception-private.h"

#include "MagickCore/image.h"

#include "MagickCore/image-private.h"

#include "MagickCore/list.h"

#include "MagickCore/magick.h"

#include "MagickCore/memory_.h"

#include "MagickCore/monitor.h"

#include "MagickCore/monitor-private.h"

#include "MagickCore/pixel-accessor.h"

#include "MagickCore/quantum-private.h"

#include "MagickCore/static.h"

#include "MagickCore/string_.h"

#include "MagickCore/module.h"

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   R e a d M A C I m a g e                                                   %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  ReadMACImage() reads an MacPaint 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 ReadMACImage method is:

%

%      Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)

%

%  A description of each parameter follows:

%

%    o image_info: the image info.

%

%    o exception: return any errors or warnings in this structure.

%

*/

static Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)

{

  Image

    *image;

  MagickBooleanType

    status;

  Quantum

    *q;

  ssize_t

    x;

  unsigned char

    *p;

  size_t

    length;

  ssize_t

    offset,

    y;

  unsigned char

    count,

    bit,

    byte,

    *pixels;

  /*

    Open image file.

  */

  assert(image_info != (const ImageInfo *) NULL);

  assert(image_info->signature == MagickCoreSignature);

  assert(exception != (ExceptionInfo *) NULL);

  assert(exception->signature == MagickCoreSignature);

  if (IsEventLogging() != MagickFalse)

    (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",

      image_info->filename);

  image=AcquireImage(image_info,exception);

  status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);

  if (status == MagickFalse)

    {

      image=DestroyImageList(image);

      return((Image *) NULL);

    }

  /*

    Read MAC X image.

  */

  length=ReadBlobLSBShort(image);

  if ((length & 0xff) != 0)

    ThrowReaderException(CorruptImageError,"CorruptImage");

  if (length == 0)

    {

      for (x=0; x < (ssize_t) 510; x++)

        if (ReadBlobByte(image) == EOF)

          ThrowReaderException(CorruptImageError,"CorruptImage");

    }

  else

    for (x=0; x < (ssize_t) 638; x++)

      if (ReadBlobByte(image) == EOF)

        ThrowReaderException(CorruptImageError,"CorruptImage");

  image->columns=576;

  image->rows=720;

  image->depth=1;

  if (AcquireImageColormap(image,2,exception) == MagickFalse)

    ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");

  if (image_info->ping != MagickFalse)

    {

      (void) CloseBlob(image);

      return(GetFirstImageInList(image));

    }

  status=SetImageExtent(image,image->columns,image->rows,exception);

  if (status == MagickFalse)

    return(DestroyImageList(image));

  status=ResetImagePixels(image,exception);

  if (status == MagickFalse)

    return(DestroyImageList(image));

  /*

    Convert MAC raster image to pixel packets.

  */

  length=(image->columns+7)/8;

  pixels=(unsigned char *) AcquireQuantumMemory(length+257,sizeof(*pixels));

  if (pixels == (unsigned char *) NULL) 

    ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");

  (void) memset(pixels,0,(length+257)*sizeof(*pixels));

  p=pixels;

  offset=0;

  for (y=0; y < (ssize_t) image->rows; )

  {

    count=(unsigned char) ReadBlobByte(image);

    if (EOFBlob(image) != MagickFalse)

      break;

    if ((count <= 0) || (count >= 128))

      {

        byte=(unsigned char) (~ReadBlobByte(image));

        count=(~count)+2;

        while (count != 0)

        {

          *p++=byte;

          offset++;

          count--;

          if (offset >= (ssize_t) length)

            {

              q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);

              if (q == (Quantum *) NULL)

                break;

              p=pixels;

              bit=0;

              byte=0;

              for (x=0; x < (ssize_t) image->columns; x++)

              {

                if (bit == 0)

                  byte=(*p++);

                SetPixelIndex(image,(Quantum) ((byte & 0x80) != 0 ? 0x01 : 0x00),q);

                bit++;

                byte<<=1;

                if (bit == 8)

                  bit=0;

                q+=(ptrdiff_t) GetPixelChannels(image);

              }

              if (SyncAuthenticPixels(image,exception) == MagickFalse)

                break;

              offset=0;

              p=pixels;

              y++;

            }

        }

        continue;

      }

    count++;

    while (count != 0)

    {

      byte=(unsigned char) (~ReadBlobByte(image));

      *p++=byte;

      offset++;

      count--;

      if (offset >= (ssize_t) length)

        {

          q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);

          if (q == (Quantum *) NULL)

            break;

          p=pixels;

          bit=0;

          byte=0;

          for (x=0; x < (ssize_t) image->columns; x++)

          {

            if (bit == 0)

              byte=(*p++);

            SetPixelIndex(image,(Quantum) ((byte & 0x80) != 0 ? 0x01 : 0x00),q);

            bit++;

            byte<<=1;

            if (bit == 8)

              bit=0;

            q+=(ptrdiff_t) GetPixelChannels(image);

          }

          if (SyncAuthenticPixels(image,exception) == MagickFalse)

            break;

          offset=0;

          p=pixels;

          y++;

        }

    }

  }

  pixels=(unsigned char *) RelinquishMagickMemory(pixels);

  (void) SyncImage(image,exception);

  if (CloseBlob(image) == MagickFalse)

    status=MagickFalse;

  if (status == MagickFalse)

    return(DestroyImageList(image));

  return(GetFirstImageInList(image));

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   R e g i s t e r M A C I m a g e                                           %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  RegisterMACImage() adds attributes for the MAC X 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 RegisterMACImage method is:

%

%      size_t RegisterMACImage(void)

%

*/

ModuleExport size_t RegisterMACImage(void)

{

  MagickInfo

    *entry;

  entry=AcquireMagickInfo("MAC","MAC","MAC Paint");

  entry->decoder=(DecodeImageHandler *) ReadMACImage;

  (void) RegisterMagickInfo(entry);

  return(MagickImageCoderSignature);

}

/*

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%                                                                             %

%                                                                             %

%                                                                             %

%   U n r e g i s t e r M A C I m a g e                                       %

%                                                                             %

%                                                                             %

%                                                                             %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%

%  UnregisterMACImage() removes format registrations made by the

%  MAC module from the list of supported formats.

%

%  The format of the UnregisterMACImage method is:

%

%      UnregisterMACImage(void)

%

*/

ModuleExport void UnregisterMACImage(void)

{

  (void) UnregisterMagickInfo("MAC");

}