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1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 %                                                                             %
4 %                                                                             %
5 %                                                                             %
6 %                            M   M   AAA   PPPP                               %
7 %                            MM MM  A   A  P   P                              %
8 %                            M M M  AAAAA  PPPP                               %
9 %                            M   M  A   A  P                                  %
10 %                            M   M  A   A  P                                  %
11 %                                                                             %
12 %                                                                             %
13 %                  Read/Write Image Colormaps As An Image File.               %
14 %                                                                             %
15 %                              Software Design                                %
16 %                                   Cristy                                    %
17 %                                 July 1992                                   %
18 %                                                                             %
19 %                                                                             %
20 %  Copyright 1999-2016 ImageMagick Studio LLC, a non-profit organization      %
21 %  dedicated to making software imaging solutions freely available.           %
22 %                                                                             %
23 %  You may not use this file except in compliance with the License.  You may  %
24 %  obtain a copy of the License at                                            %
25 %                                                                             %
26 %    http://www.imagemagick.org/script/license.php                            %
27 %                                                                             %
28 %  Unless required by applicable law or agreed to in writing, software        %
29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
31 %  See the License for the specific language governing permissions and        %
32 %  limitations under the License.                                             %
33 %                                                                             %
34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
35 %
36 %
37 */
38 
39 /*
40   Include declarations.
41 */
42 #include "MagickCore/studio.h"
43 #include "MagickCore/attribute.h"
44 #include "MagickCore/blob.h"
45 #include "MagickCore/blob-private.h"
46 #include "MagickCore/cache.h"
47 #include "MagickCore/color.h"
48 #include "MagickCore/color-private.h"
49 #include "MagickCore/colormap.h"
50 #include "MagickCore/colormap-private.h"
51 #include "MagickCore/colorspace.h"
52 #include "MagickCore/colorspace-private.h"
53 #include "MagickCore/exception.h"
54 #include "MagickCore/exception-private.h"
55 #include "MagickCore/histogram.h"
56 #include "MagickCore/image.h"
57 #include "MagickCore/image-private.h"
58 #include "MagickCore/list.h"
59 #include "MagickCore/magick.h"
60 #include "MagickCore/memory_.h"
61 #include "MagickCore/pixel-accessor.h"
62 #include "MagickCore/quantum-private.h"
63 #include "MagickCore/static.h"
64 #include "MagickCore/statistic.h"
65 #include "MagickCore/string_.h"
66 #include "MagickCore/module.h"
67 
68 /*
69   Forward declarations.
70 */
71 static MagickBooleanType
72   WriteMAPImage(const ImageInfo *,Image *,ExceptionInfo *);
73 
74 /*
75 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
76 %                                                                             %
77 %                                                                             %
78 %                                                                             %
79 %   R e a d M A P I m a g e                                                   %
80 %                                                                             %
81 %                                                                             %
82 %                                                                             %
83 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
84 %
85 %  ReadMAPImage() reads an image of raw RGB colormap and colormap index
86 %  bytes and returns it.  It allocates the memory necessary for the new Image
87 %  structure and returns a pointer to the new image.
88 %
89 %  The format of the ReadMAPImage method is:
90 %
91 %      Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
92 %
93 %  A description of each parameter follows:
94 %
95 %    o image_info: the image info.
96 %
97 %    o exception: return any errors or warnings in this structure.
98 %
99 */
ReadMAPImage(const ImageInfo * image_info,ExceptionInfo * exception)100 static Image *ReadMAPImage(const ImageInfo *image_info,ExceptionInfo *exception)
101 {
102   Image
103     *image;
104 
105   MagickBooleanType
106     status;
107 
108   Quantum
109     index;
110 
111   register ssize_t
112     x;
113 
114   register Quantum
115     *q;
116 
117   register ssize_t
118     i;
119 
120   register unsigned char
121     *p;
122 
123   size_t
124     depth,
125     packet_size,
126     quantum;
127 
128   ssize_t
129     count,
130     y;
131 
132   unsigned char
133     *colormap,
134     *pixels;
135 
136   /*
137     Open image file.
138   */
139   assert(image_info != (const ImageInfo *) NULL);
140   assert(image_info->signature == MagickCoreSignature);
141   if (image_info->debug != MagickFalse)
142     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
143       image_info->filename);
144   assert(exception != (ExceptionInfo *) NULL);
145   assert(exception->signature == MagickCoreSignature);
146   image=AcquireImage(image_info,exception);
147   if ((image->columns == 0) || (image->rows == 0))
148     ThrowReaderException(OptionError,"MustSpecifyImageSize");
149   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
150   if (status == MagickFalse)
151     {
152       image=DestroyImageList(image);
153       return((Image *) NULL);
154     }
155   /*
156     Initialize image structure.
157   */
158   image->storage_class=PseudoClass;
159   status=AcquireImageColormap(image,(size_t)
160     (image->offset != 0 ? image->offset : 256),exception);
161   if (status == MagickFalse)
162     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
163   depth=GetImageQuantumDepth(image,MagickTrue);
164   packet_size=(size_t) (depth/8);
165   pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
166     sizeof(*pixels));
167   packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
168   colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
169     sizeof(*colormap));
170   if ((pixels == (unsigned char *) NULL) ||
171       (colormap == (unsigned char *) NULL))
172     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
173   /*
174     Read image colormap.
175   */
176   count=ReadBlob(image,packet_size*image->colors,colormap);
177   if (count != (ssize_t) (packet_size*image->colors))
178     ThrowReaderException(CorruptImageError,"InsufficientImageDataInFile");
179   p=colormap;
180   if (image->depth <= 8)
181     for (i=0; i < (ssize_t) image->colors; i++)
182     {
183       image->colormap[i].red=ScaleCharToQuantum(*p++);
184       image->colormap[i].green=ScaleCharToQuantum(*p++);
185       image->colormap[i].blue=ScaleCharToQuantum(*p++);
186     }
187   else
188     for (i=0; i < (ssize_t) image->colors; i++)
189     {
190       quantum=(*p++ << 8);
191       quantum|=(*p++);
192       image->colormap[i].red=(Quantum) quantum;
193       quantum=(*p++ << 8);
194       quantum|=(*p++);
195       image->colormap[i].green=(Quantum) quantum;
196       quantum=(*p++ << 8);
197       quantum|=(*p++);
198       image->colormap[i].blue=(Quantum) quantum;
199     }
200   colormap=(unsigned char *) RelinquishMagickMemory(colormap);
201   if (image_info->ping != MagickFalse)
202     {
203       (void) CloseBlob(image);
204       return(GetFirstImageInList(image));
205     }
206   status=SetImageExtent(image,image->columns,image->rows,exception);
207   if (status == MagickFalse)
208     return(DestroyImageList(image));
209   /*
210     Read image pixels.
211   */
212   packet_size=(size_t) (depth/8);
213   for (y=0; y < (ssize_t) image->rows; y++)
214   {
215     p=pixels;
216     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
217     if (q == (Quantum *) NULL)
218       break;
219     count=ReadBlob(image,(size_t) packet_size*image->columns,pixels);
220     if (count != (ssize_t) (packet_size*image->columns))
221       break;
222     for (x=0; x < (ssize_t) image->columns; x++)
223     {
224       index=ConstrainColormapIndex(image,*p,exception);
225       p++;
226       if (image->colors > 256)
227         {
228           index=ConstrainColormapIndex(image,((size_t) index << 8)+(*p),
229             exception);
230           p++;
231         }
232       SetPixelIndex(image,index,q);
233       SetPixelViaPixelInfo(image,image->colormap+(ssize_t) index,q);
234       q+=GetPixelChannels(image);
235     }
236     if (SyncAuthenticPixels(image,exception) == MagickFalse)
237       break;
238   }
239   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
240   if (y < (ssize_t) image->rows)
241     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
242       image->filename);
243   (void) CloseBlob(image);
244   return(GetFirstImageInList(image));
245 }
246 
247 /*
248 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
249 %                                                                             %
250 %                                                                             %
251 %                                                                             %
252 %   R e g i s t e r M A P I m a g e                                           %
253 %                                                                             %
254 %                                                                             %
255 %                                                                             %
256 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
257 %
258 %  RegisterMAPImage() adds attributes for the MAP image format to
259 %  the list of supported formats.  The attributes include the image format
260 %  tag, a method to read and/or write the format, whether the format
261 %  supports the saving of more than one frame to the same file or blob,
262 %  whether the format supports native in-memory I/O, and a brief
263 %  description of the format.
264 %
265 %  The format of the RegisterMAPImage method is:
266 %
267 %      size_t RegisterMAPImage(void)
268 %
269 */
RegisterMAPImage(void)270 ModuleExport size_t RegisterMAPImage(void)
271 {
272   MagickInfo
273     *entry;
274 
275   entry=AcquireMagickInfo("MAP","MAP","Colormap intensities and indices");
276   entry->decoder=(DecodeImageHandler *) ReadMAPImage;
277   entry->encoder=(EncodeImageHandler *) WriteMAPImage;
278   entry->flags^=CoderAdjoinFlag;
279   entry->format_type=ExplicitFormatType;
280   entry->flags|=CoderRawSupportFlag;
281   entry->flags|=CoderEndianSupportFlag;
282   (void) RegisterMagickInfo(entry);
283   return(MagickImageCoderSignature);
284 }
285 
286 /*
287 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
288 %                                                                             %
289 %                                                                             %
290 %                                                                             %
291 %   U n r e g i s t e r M A P I m a g e                                       %
292 %                                                                             %
293 %                                                                             %
294 %                                                                             %
295 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
296 %
297 %  UnregisterMAPImage() removes format registrations made by the
298 %  MAP module from the list of supported formats.
299 %
300 %  The format of the UnregisterMAPImage method is:
301 %
302 %      UnregisterMAPImage(void)
303 %
304 */
UnregisterMAPImage(void)305 ModuleExport void UnregisterMAPImage(void)
306 {
307   (void) UnregisterMagickInfo("MAP");
308 }
309 
310 /*
311 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
312 %                                                                             %
313 %                                                                             %
314 %                                                                             %
315 %   W r i t e M A P I m a g e                                                 %
316 %                                                                             %
317 %                                                                             %
318 %                                                                             %
319 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
320 %
321 %  WriteMAPImage() writes an image to a file as red, green, and blue
322 %  colormap bytes followed by the colormap indexes.
323 %
324 %  The format of the WriteMAPImage method is:
325 %
326 %      MagickBooleanType WriteMAPImage(const ImageInfo *image_info,
327 %        Image *image,ExceptionInfo *exception)
328 %
329 %  A description of each parameter follows.
330 %
331 %    o image_info: the image info.
332 %
333 %    o image:  The image.
334 %
335 %    o exception: return any errors or warnings in this structure.
336 %
337 */
WriteMAPImage(const ImageInfo * image_info,Image * image,ExceptionInfo * exception)338 static MagickBooleanType WriteMAPImage(const ImageInfo *image_info,Image *image,
339   ExceptionInfo *exception)
340 {
341   MagickBooleanType
342     status;
343 
344   register const Quantum
345     *p;
346 
347   register ssize_t
348     i,
349     x;
350 
351   register unsigned char
352     *q;
353 
354   size_t
355     depth,
356     packet_size;
357 
358   ssize_t
359     y;
360 
361   unsigned char
362     *colormap,
363     *pixels;
364 
365   /*
366     Open output image file.
367   */
368   assert(image_info != (const ImageInfo *) NULL);
369   assert(image_info->signature == MagickCoreSignature);
370   assert(image != (Image *) NULL);
371   assert(image->signature == MagickCoreSignature);
372   if (image->debug != MagickFalse)
373     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
374   assert(exception != (ExceptionInfo *) NULL);
375   assert(exception->signature == MagickCoreSignature);
376   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
377   if (status == MagickFalse)
378     return(status);
379   (void) TransformImageColorspace(image,sRGBColorspace,exception);
380   /*
381     Allocate colormap.
382   */
383   if (IsPaletteImage(image) == MagickFalse)
384     (void) SetImageType(image,PaletteType,exception);
385   depth=GetImageQuantumDepth(image,MagickTrue);
386   packet_size=(size_t) (depth/8);
387   pixels=(unsigned char *) AcquireQuantumMemory(image->columns,packet_size*
388     sizeof(*pixels));
389   packet_size=(size_t) (image->colors > 256 ? 6UL : 3UL);
390   colormap=(unsigned char *) AcquireQuantumMemory(image->colors,packet_size*
391     sizeof(*colormap));
392   if ((pixels == (unsigned char *) NULL) ||
393       (colormap == (unsigned char *) NULL))
394     ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
395   /*
396     Write colormap to file.
397   */
398   q=colormap;
399   if (image->depth <= 8)
400     for (i=0; i < (ssize_t) image->colors; i++)
401     {
402       *q++=(unsigned char) image->colormap[i].red;
403       *q++=(unsigned char) image->colormap[i].green;
404       *q++=(unsigned char) image->colormap[i].blue;
405     }
406   else
407     for (i=0; i < (ssize_t) image->colors; i++)
408     {
409       *q++=(unsigned char) ((size_t) image->colormap[i].red >> 8);
410       *q++=(unsigned char) image->colormap[i].red;
411       *q++=(unsigned char) ((size_t) image->colormap[i].green >> 8);
412       *q++=(unsigned char) image->colormap[i].green;
413       *q++=(unsigned char) ((size_t) image->colormap[i].blue >> 8);
414       *q++=(unsigned char) image->colormap[i].blue;
415     }
416   (void) WriteBlob(image,packet_size*image->colors,colormap);
417   colormap=(unsigned char *) RelinquishMagickMemory(colormap);
418   /*
419     Write image pixels to file.
420   */
421   for (y=0; y < (ssize_t) image->rows; y++)
422   {
423     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
424     if (p == (const Quantum *) NULL)
425       break;
426     q=pixels;
427     for (x=0; x < (ssize_t) image->columns; x++)
428     {
429       if (image->colors > 256)
430         *q++=(unsigned char) ((size_t) GetPixelIndex(image,p) >> 8);
431       *q++=(unsigned char) GetPixelIndex(image,p);
432       p+=GetPixelChannels(image);
433     }
434     (void) WriteBlob(image,(size_t) (q-pixels),pixels);
435   }
436   pixels=(unsigned char *) RelinquishMagickMemory(pixels);
437   (void) CloseBlob(image);
438   return(status);
439 }
440