granicus.if.org Git - imagemagick/blob - coders/mac.c

   1 /*
   2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   3 %                                                                             %
   4 %                                                                             %
   5 %                                                                             %
   6 %                                                                             %
   7 %                            M   M   AAA    CCCC                              %
   8 %                            MM MM  A   A  C                                  %
   9 %                            M M M  AAAAA  C                                  %
  10 %                            M   M  A   A  C                                  %
  11 %                            M   M  A   A   CCCC                              %
  12 %                                                                             %
  13 %                                                                             %
  14 %                         Read MacPaint Image Format                          %
  15 %                                                                             %
  16 %                              Software Design                                %
  17 %                                John Cristy                                  %
  18 %                                 July 1992                                   %
  19 %                                                                             %
  20 %                                                                             %
  21 %  Copyright 1999-2013 ImageMagick Studio LLC, a non-profit organization      %
  22 %  dedicated to making software imaging solutions freely available.           %
  23 %                                                                             %
  24 %  You may not use this file except in compliance with the License.  You may  %
  25 %  obtain a copy of the License at                                            %
  26 %                                                                             %
  27 %    http://www.imagemagick.org/script/license.php                            %
  28 %                                                                             %
  29 %  Unless required by applicable law or agreed to in writing, software        %
  30 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  31 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  32 %  See the License for the specific language governing permissions and        %
  33 %  limitations under the License.                                             %
  34 %                                                                             %
  35 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  36 %
  37 %
  38 */
  39 \f
  40 /*
  41   Include declarations.
  42 */
  43 #include "MagickCore/studio.h"
  44 #include "MagickCore/blob.h"
  45 #include "MagickCore/blob-private.h"
  46 #include "MagickCore/cache.h"
  47 #include "MagickCore/colormap.h"
  48 #include "MagickCore/colorspace.h"
  49 #include "MagickCore/exception.h"
  50 #include "MagickCore/exception-private.h"
  51 #include "MagickCore/image.h"
  52 #include "MagickCore/image-private.h"
  53 #include "MagickCore/list.h"
  54 #include "MagickCore/magick.h"
  55 #include "MagickCore/memory_.h"
  56 #include "MagickCore/monitor.h"
  57 #include "MagickCore/monitor-private.h"
  58 #include "MagickCore/pixel-accessor.h"
  59 #include "MagickCore/quantum-private.h"
  60 #include "MagickCore/static.h"
  61 #include "MagickCore/string_.h"
  62 #include "MagickCore/module.h"
  63 \f
  64 /*
  65 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  66 %                                                                             %
  67 %                                                                             %
  68 %                                                                             %
  69 %   R e a d M A C I m a g e                                                   %
  70 %                                                                             %
  71 %                                                                             %
  72 %                                                                             %
  73 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  74 %
  75 %  ReadMACImage() reads an MacPaint image file and returns it.  It
  76 %  allocates the memory necessary for the new Image structure and returns a
  77 %  pointer to the new image.
  78 %
  79 %  The format of the ReadMACImage method is:
  80 %
  81 %      Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)
  82 %
  83 %  A description of each parameter follows:
  84 %
  85 %    o image_info: the image info.
  86 %
  87 %    o exception: return any errors or warnings in this structure.
  88 %
  89 */
  90 static Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)
  91 {
  92   Image
  93     *image;
  94
  95   MagickBooleanType
  96     status;
  97
  98   register Quantum
  99     *q;
 100
 101   register ssize_t
 102     x;
 103
 104   register unsigned char
 105     *p;
 106
 107   size_t
 108     length;
 109
 110   ssize_t
 111     offset,
 112     y;
 113
 114   unsigned char
 115     count,
 116     bit,
 117     byte,
 118     *pixels;
 119
 120   /*
 121     Open image file.
 122   */
 123   assert(image_info != (const ImageInfo *) NULL);
 124   assert(image_info->signature == MagickSignature);
 125   if (image_info->debug != MagickFalse)
 126     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 127       image_info->filename);
 128   assert(exception != (ExceptionInfo *) NULL);
 129   assert(exception->signature == MagickSignature);
 130   image=AcquireImage(image_info,exception);
 131   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 132   if (status == MagickFalse)
 133     {
 134       image=DestroyImageList(image);
 135       return((Image *) NULL);
 136     }
 137   /*
 138     Read MAC X image.
 139   */
 140   length=ReadBlobLSBShort(image);
 141   if ((length & 0xff) != 0)
 142     ThrowReaderException(CorruptImageError,"CorruptImage");
 143   for (x=0; x < (ssize_t) 638; x++)
 144     if (ReadBlobByte(image) == EOF)
 145       ThrowReaderException(CorruptImageError,"CorruptImage");
 146   image->columns=576;
 147   image->rows=720;
 148   image->depth=1;
 149   if (AcquireImageColormap(image,2,exception) == MagickFalse)
 150     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 151   if (image_info->ping != MagickFalse)
 152     {
 153       (void) CloseBlob(image);
 154       return(GetFirstImageInList(image));
 155     }
 156   /*
 157     Convert MAC raster image to pixel packets.
 158   */
 159   length=(image->columns+7)/8;
 160   pixels=(unsigned char *) AcquireQuantumMemory(length+1,sizeof(*pixels));
 161   if (pixels == (unsigned char *) NULL)
 162     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 163   p=pixels;
 164   offset=0;
 165   for (y=0; y < (ssize_t) image->rows; )
 166   {
 167     count=(unsigned char) ReadBlobByte(image);
 168     if (EOFBlob(image) != MagickFalse)
 169       break;
 170     if ((count <= 0) || (count >= 128))
 171       {
 172         byte=(unsigned char) (~ReadBlobByte(image));
 173         count=(~count)+2;
 174         while (count != 0)
 175         {
 176           *p++=byte;
 177           offset++;
 178           count--;
 179           if (offset >= (ssize_t) length)
 180             {
 181               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 182               if (q == (Quantum *) NULL)
 183                 break;
 184               p=pixels;
 185               bit=0;
 186               byte=0;
 187               for (x=0; x < (ssize_t) image->columns; x++)
 188               {
 189                 if (bit == 0)
 190                   byte=(*p++);
 191                 SetPixelIndex(image,((byte & 0x80) != 0 ? 0x01 : 0x00),q);
 192                 bit++;
 193                 byte<<=1;
 194                 if (bit == 8)
 195                   bit=0;
 196                 q+=GetPixelChannels(image);
 197               }
 198               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 199                 break;
 200               offset=0;
 201               p=pixels;
 202               y++;
 203             }
 204         }
 205         continue;
 206       }
 207     count++;
 208     while (count != 0)
 209     {
 210       byte=(unsigned char) (~ReadBlobByte(image));
 211       *p++=byte;
 212       offset++;
 213       count--;
 214       if (offset >= (ssize_t) length)
 215         {
 216           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 217           if (q == (Quantum *) NULL)
 218             break;
 219           p=pixels;
 220           bit=0;
 221           byte=0;
 222           for (x=0; x < (ssize_t) image->columns; x++)
 223           {
 224             if (bit == 0)
 225               byte=(*p++);
 226             SetPixelIndex(image,((byte & 0x80) != 0 ? 0x01 : 0x00),q);
 227             bit++;
 228             byte<<=1;
 229             if (bit == 8)
 230               bit=0;
 231             q+=GetPixelChannels(image);
 232           }
 233           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 234             break;
 235           offset=0;
 236           p=pixels;
 237           y++;
 238         }
 239     }
 240   }
 241   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 242   (void) CloseBlob(image);
 243   return(GetFirstImageInList(image));
 244 }
 245 \f
 246 /*
 247 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 248 %                                                                             %
 249 %                                                                             %
 250 %                                                                             %
 251 %   R e g i s t e r M A C I m a g e                                           %
 252 %                                                                             %
 253 %                                                                             %
 254 %                                                                             %
 255 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 256 %
 257 %  RegisterMACImage() adds attributes for the MAC X image format to the list
 258 %  of supported formats.  The attributes include the image format tag, a
 259 %  method to read and/or write the format, whether the format supports the
 260 %  saving of more than one frame to the same file or blob, whether the format
 261 %  supports native in-memory I/O, and a brief description of the format.
 262 %
 263 %  The format of the RegisterMACImage method is:
 264 %
 265 %      size_t RegisterMACImage(void)
 266 %
 267 */
 268 ModuleExport size_t RegisterMACImage(void)
 269 {
 270   MagickInfo
 271     *entry;
 272
 273   entry=SetMagickInfo("MAC");
 274   entry->decoder=(DecodeImageHandler *) ReadMACImage;
 275   entry->description=ConstantString("MAC Paint");
 276   entry->module=ConstantString("MAC");
 277   (void) RegisterMagickInfo(entry);
 278   return(MagickImageCoderSignature);
 279 }
 280 \f
 281 /*
 282 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 283 %                                                                             %
 284 %                                                                             %
 285 %                                                                             %
 286 %   U n r e g i s t e r M A C I m a g e                                       %
 287 %                                                                             %
 288 %                                                                             %
 289 %                                                                             %
 290 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 291 %
 292 %  UnregisterMACImage() removes format registrations made by the
 293 %  MAC module from the list of supported formats.
 294 %
 295 %  The format of the UnregisterMACImage method is:
 296 %
 297 %      UnregisterMACImage(void)
 298 %
 299 */
 300 ModuleExport void UnregisterMACImage(void)
 301 {
 302   (void) UnregisterMagickInfo("MAC");
 303 }