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 %                                   Cristy                                    %
  18 %                                 July 1992                                   %
  19 %                                                                             %
  20 %                                                                             %
  21 %  Copyright 1999-2018 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 %    https://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 == MagickCoreSignature);
 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 == MagickCoreSignature);
 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   status=SetImageExtent(image,image->columns,image->rows,exception);
 157   if (status == MagickFalse)
 158     return(DestroyImageList(image));
 159   /*
 160     Convert MAC raster image to pixel packets.
 161   */
 162   length=(image->columns+7)/8;
 163   pixels=(unsigned char *) AcquireQuantumMemory(length+1,sizeof(*pixels));
 164   if (pixels == (unsigned char *) NULL)
 165     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 166   p=pixels;
 167   offset=0;
 168   for (y=0; y < (ssize_t) image->rows; )
 169   {
 170     count=(unsigned char) ReadBlobByte(image);
 171     if (EOFBlob(image) != MagickFalse)
 172       break;
 173     if ((count <= 0) || (count >= 128))
 174       {
 175         byte=(unsigned char) (~ReadBlobByte(image));
 176         count=(~count)+2;
 177         while (count != 0)
 178         {
 179           *p++=byte;
 180           offset++;
 181           count--;
 182           if (offset >= (ssize_t) length)
 183             {
 184               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 185               if (q == (Quantum *) NULL)
 186                 break;
 187               p=pixels;
 188               bit=0;
 189               byte=0;
 190               for (x=0; x < (ssize_t) image->columns; x++)
 191               {
 192                 if (bit == 0)
 193                   byte=(*p++);
 194                 SetPixelIndex(image,((byte & 0x80) != 0 ? 0x01 : 0x00),q);
 195                 bit++;
 196                 byte<<=1;
 197                 if (bit == 8)
 198                   bit=0;
 199                 q+=GetPixelChannels(image);
 200               }
 201               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 202                 break;
 203               offset=0;
 204               p=pixels;
 205               y++;
 206             }
 207         }
 208         continue;
 209       }
 210     count++;
 211     while (count != 0)
 212     {
 213       byte=(unsigned char) (~ReadBlobByte(image));
 214       *p++=byte;
 215       offset++;
 216       count--;
 217       if (offset >= (ssize_t) length)
 218         {
 219           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 220           if (q == (Quantum *) NULL)
 221             break;
 222           p=pixels;
 223           bit=0;
 224           byte=0;
 225           for (x=0; x < (ssize_t) image->columns; x++)
 226           {
 227             if (bit == 0)
 228               byte=(*p++);
 229             SetPixelIndex(image,((byte & 0x80) != 0 ? 0x01 : 0x00),q);
 230             bit++;
 231             byte<<=1;
 232             if (bit == 8)
 233               bit=0;
 234             q+=GetPixelChannels(image);
 235           }
 236           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 237             break;
 238           offset=0;
 239           p=pixels;
 240           y++;
 241         }
 242     }
 243   }
 244   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 245   (void) SyncImage(image,exception);
 246   (void) CloseBlob(image);
 247   return(GetFirstImageInList(image));
 248 }
 249 \f
 250 /*
 251 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 252 %                                                                             %
 253 %                                                                             %
 254 %                                                                             %
 255 %   R e g i s t e r M A C I m a g e                                           %
 256 %                                                                             %
 257 %                                                                             %
 258 %                                                                             %
 259 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 260 %
 261 %  RegisterMACImage() adds attributes for the MAC X image format to the list
 262 %  of supported formats.  The attributes include the image format tag, a
 263 %  method to read and/or write the format, whether the format supports the
 264 %  saving of more than one frame to the same file or blob, whether the format
 265 %  supports native in-memory I/O, and a brief description of the format.
 266 %
 267 %  The format of the RegisterMACImage method is:
 268 %
 269 %      size_t RegisterMACImage(void)
 270 %
 271 */
 272 ModuleExport size_t RegisterMACImage(void)
 273 {
 274   MagickInfo
 275     *entry;
 276
 277   entry=AcquireMagickInfo("MAC","MAC","MAC Paint");
 278   entry->decoder=(DecodeImageHandler *) ReadMACImage;
 279   (void) RegisterMagickInfo(entry);
 280   return(MagickImageCoderSignature);
 281 }
 282 \f
 283 /*
 284 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 285 %                                                                             %
 286 %                                                                             %
 287 %                                                                             %
 288 %   U n r e g i s t e r M A C I m a g e                                       %
 289 %                                                                             %
 290 %                                                                             %
 291 %                                                                             %
 292 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 293 %
 294 %  UnregisterMACImage() removes format registrations made by the
 295 %  MAC module from the list of supported formats.
 296 %
 297 %  The format of the UnregisterMACImage method is:
 298 %
 299 %      UnregisterMACImage(void)
 300 %
 301 */
 302 ModuleExport void UnregisterMACImage(void)
 303 {
 304   (void) UnregisterMagickInfo("MAC");
 305 }