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 1999-2011 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 "magick/studio.h"
  44 #include "magick/blob.h"
  45 #include "magick/blob-private.h"
  46 #include "magick/cache.h"
  47 #include "magick/colormap.h"
  48 #include "magick/colorspace.h"
  49 #include "magick/exception.h"
  50 #include "magick/exception-private.h"
  51 #include "magick/image.h"
  52 #include "magick/image-private.h"
  53 #include "magick/list.h"
  54 #include "magick/magick.h"
  55 #include "magick/memory_.h"
  56 #include "magick/monitor.h"
  57 #include "magick/monitor-private.h"
  58 #include "magick/quantum-private.h"
  59 #include "magick/static.h"
  60 #include "magick/string_.h"
  61 #include "magick/module.h"
  62 \f
  63 /*
  64 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  65 %                                                                             %
  66 %                                                                             %
  67 %                                                                             %
  68 %   R e a d M A C I m a g e                                                   %
  69 %                                                                             %
  70 %                                                                             %
  71 %                                                                             %
  72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  73 %
  74 %  ReadMACImage() reads an MacPaint image file and returns it.  It
  75 %  allocates the memory necessary for the new Image structure and returns a
  76 %  pointer to the new image.
  77 %
  78 %  The format of the ReadMACImage method is:
  79 %
  80 %      Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)
  81 %
  82 %  A description of each parameter follows:
  83 %
  84 %    o image_info: the image info.
  85 %
  86 %    o exception: return any errors or warnings in this structure.
  87 %
  88 */
  89 static Image *ReadMACImage(const ImageInfo *image_info,ExceptionInfo *exception)
  90 {
  91   Image
  92     *image;
  93
  94   MagickBooleanType
  95     status;
  96
  97   register IndexPacket
  98     *indexes;
  99
 100   register PixelPacket
 101     *q;
 102
 103   register ssize_t
 104     x;
 105
 106   register unsigned char
 107     *p;
 108
 109   size_t
 110     length;
 111
 112   ssize_t
 113     offset,
 114     y;
 115
 116   unsigned char
 117     count,
 118     bit,
 119     byte,
 120     *pixels;
 121
 122   /*
 123     Open image file.
 124   */
 125   assert(image_info != (const ImageInfo *) NULL);
 126   assert(image_info->signature == MagickSignature);
 127   if (image_info->debug != MagickFalse)
 128     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
 129       image_info->filename);
 130   assert(exception != (ExceptionInfo *) NULL);
 131   assert(exception->signature == MagickSignature);
 132   image=AcquireImage(image_info);
 133   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
 134   if (status == MagickFalse)
 135     {
 136       image=DestroyImageList(image);
 137       return((Image *) NULL);
 138     }
 139   /*
 140     Read MAC X image.
 141   */
 142   length=ReadBlobLSBShort(image);
 143   if ((length & 0xff) != 0)
 144     ThrowReaderException(CorruptImageError,"CorruptImage");
 145   for (x=0; x < (ssize_t) 638; x++)
 146     if (ReadBlobByte(image) == EOF)
 147       ThrowReaderException(CorruptImageError,"CorruptImage");
 148   image->columns=576;
 149   image->rows=720;
 150   image->depth=1;
 151   if (AcquireImageColormap(image,2) == MagickFalse)
 152     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 153   if (image_info->ping != MagickFalse)
 154     {
 155       (void) CloseBlob(image);
 156       return(GetFirstImageInList(image));
 157     }
 158   /*
 159     Convert MAC raster image to pixel packets.
 160   */
 161   length=(image->columns+7)/8;
 162   pixels=(unsigned char *) AcquireQuantumMemory(length+1,sizeof(*pixels));
 163   if (pixels == (unsigned char *) NULL)
 164     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
 165   p=pixels;
 166   offset=0;
 167   for (y=0; y < (ssize_t) image->rows; )
 168   {
 169     count=(unsigned char) ReadBlobByte(image);
 170     if (EOFBlob(image) != MagickFalse)
 171       break;
 172     if ((count <= 0) || (count >= 128))
 173       {
 174         byte=(unsigned char) (~ReadBlobByte(image));
 175         count=(~count)+2;
 176         while (count != 0)
 177         {
 178           *p++=byte;
 179           offset++;
 180           count--;
 181           if (offset >= (ssize_t) length)
 182             {
 183               q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 184               if (q == (PixelPacket *) NULL)
 185                 break;
 186               indexes=GetAuthenticIndexQueue(image);
 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                 indexes[x]=(IndexPacket) ((byte & 0x80) != 0 ? 0x01 : 0x00);
 195                 bit++;
 196                 byte<<=1;
 197                 if (bit == 8)
 198                   bit=0;
 199               }
 200               if (SyncAuthenticPixels(image,exception) == MagickFalse)
 201                 break;
 202               offset=0;
 203               p=pixels;
 204               y++;
 205             }
 206         }
 207         continue;
 208       }
 209     count++;
 210     while (count != 0)
 211     {
 212       byte=(unsigned char) (~ReadBlobByte(image));
 213       *p++=byte;
 214       offset++;
 215       count--;
 216       if (offset >= (ssize_t) length)
 217         {
 218           q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
 219           if (q == (PixelPacket *) NULL)
 220             break;
 221           indexes=GetAuthenticIndexQueue(image);
 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             indexes[x]=(IndexPacket) ((byte & 0x80) != 0 ? 0x01 : 0x00);
 230             bit++;
 231             byte<<=1;
 232             if (bit == 8)
 233               bit=0;
 234           }
 235           if (SyncAuthenticPixels(image,exception) == MagickFalse)
 236             break;
 237           offset=0;
 238           p=pixels;
 239           y++;
 240         }
 241     }
 242   }
 243   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
 244   (void) CloseBlob(image);
 245   return(GetFirstImageInList(image));
 246 }
 247 \f
 248 /*
 249 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 250 %                                                                             %
 251 %                                                                             %
 252 %                                                                             %
 253 %   R e g i s t e r M A C I m a g e                                           %
 254 %                                                                             %
 255 %                                                                             %
 256 %                                                                             %
 257 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 258 %
 259 %  RegisterMACImage() adds attributes for the MAC X image format to the list
 260 %  of supported formats.  The attributes include the image format tag, a
 261 %  method to read and/or write the format, whether the format supports the
 262 %  saving of more than one frame to the same file or blob, whether the format
 263 %  supports native in-memory I/O, and a brief description of the format.
 264 %
 265 %  The format of the RegisterMACImage method is:
 266 %
 267 %      size_t RegisterMACImage(void)
 268 %
 269 */
 270 ModuleExport size_t RegisterMACImage(void)
 271 {
 272   MagickInfo
 273     *entry;
 274
 275   entry=SetMagickInfo("MAC");
 276   entry->decoder=(DecodeImageHandler *) ReadMACImage;
 277   entry->description=ConstantString("MAC Paint");
 278   entry->module=ConstantString("MAC");
 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 }