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1 /*
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 %                                                                             %
4 %                                                                             %
5 %                                                                             %
6 %                         W   W  BBBB   M   M  PPPP                           %
7 %                         W   W  B   B  MM MM  P   P                          %
8 %                         W W W  BBBB   M M M  PPPP                           %
9 %                         WW WW  B   B  M   M  P                              %
10 %                         W   W  BBBB   M   M  P                              %
11 %                                                                             %
12 %                                                                             %
13 %               Read/Write Wireless Bitmap (level 0) Image Format             %
14 %                                                                             %
15 %                              Software Design                                %
16 %                                   Cristy                                    %
17 %                               January 2000                                  %
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   Include declarations.
40 */
41 #include "MagickCore/studio.h"
42 #include "MagickCore/attribute.h"
43 #include "MagickCore/blob.h"
44 #include "MagickCore/blob-private.h"
45 #include "MagickCore/cache.h"
46 #include "MagickCore/color-private.h"
47 #include "MagickCore/colormap.h"
48 #include "MagickCore/colorspace.h"
49 #include "MagickCore/colorspace-private.h"
50 #include "MagickCore/exception.h"
51 #include "MagickCore/exception-private.h"
52 #include "MagickCore/image.h"
53 #include "MagickCore/image-private.h"
54 #include "MagickCore/list.h"
55 #include "MagickCore/magick.h"
56 #include "MagickCore/memory_.h"
57 #include "MagickCore/monitor.h"
58 #include "MagickCore/monitor-private.h"
59 #include "MagickCore/pixel-accessor.h"
60 #include "MagickCore/quantum-private.h"
61 #include "MagickCore/static.h"
62 #include "MagickCore/string_.h"
63 #include "MagickCore/module.h"
64 
65 /*
66   Forward declarations.
67 */
68 static MagickBooleanType
69   WriteWBMPImage(const ImageInfo *,Image *,ExceptionInfo *);
70 
71 /*
72 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
73 %                                                                             %
74 %                                                                             %
75 %                                                                             %
76 %   R e a d W B M P I m a g e                                                 %
77 %                                                                             %
78 %                                                                             %
79 %                                                                             %
80 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
81 %
82 %  ReadWBMPImage() reads a WBMP (level 0) image file and returns it.  It
83 %  allocates the memory necessary for the new Image structure and returns a
84 %  pointer to the new image.
85 %
86 %  ReadWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
87 %
88 %  The format of the ReadWBMPImage method is:
89 %
90 %      Image *ReadWBMPImage(const ImageInfo *image_info,
91 %        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 */
100 
WBMPReadInteger(Image * image,size_t * value)101 static MagickBooleanType WBMPReadInteger(Image *image,size_t *value)
102 {
103   int
104     byte;
105 
106   *value=0;
107   do
108   {
109     byte=ReadBlobByte(image);
110     if (byte == EOF)
111       return(MagickFalse);
112     *value<<=7;
113     *value|=(unsigned int) (byte & 0x7f);
114   } while (byte & 0x80);
115   return(MagickTrue);
116 }
117 
ReadWBMPImage(const ImageInfo * image_info,ExceptionInfo * exception)118 static Image *ReadWBMPImage(const ImageInfo *image_info,
119   ExceptionInfo *exception)
120 {
121   Image
122     *image;
123 
124   int
125     byte;
126 
127   MagickBooleanType
128     status;
129 
130   register ssize_t
131     x;
132 
133   register Quantum
134     *q;
135 
136   ssize_t
137     y;
138 
139   unsigned char
140     bit;
141 
142   unsigned short
143     header;
144 
145   /*
146     Open image file.
147   */
148   assert(image_info != (const ImageInfo *) NULL);
149   assert(image_info->signature == MagickCoreSignature);
150   if (image_info->debug != MagickFalse)
151     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",
152       image_info->filename);
153   assert(exception != (ExceptionInfo *) NULL);
154   assert(exception->signature == MagickCoreSignature);
155   image=AcquireImage(image_info,exception);
156   status=OpenBlob(image_info,image,ReadBinaryBlobMode,exception);
157   if (status == MagickFalse)
158     {
159       image=DestroyImageList(image);
160       return((Image *) NULL);
161     }
162   if (ReadBlob(image,2,(unsigned char *) &header) == 0)
163     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
164   if (header != 0)
165     ThrowReaderException(CoderError,"OnlyLevelZerofilesSupported");
166   /*
167     Initialize image structure.
168   */
169   if (WBMPReadInteger(image,&image->columns) == MagickFalse)
170     ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
171   if (WBMPReadInteger(image,&image->rows) == MagickFalse)
172     ThrowReaderException(CorruptImageError,"CorruptWBMPimage");
173   if ((image->columns == 0) || (image->rows == 0))
174     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
175   if (DiscardBlobBytes(image,image->offset) == MagickFalse)
176     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
177       image->filename);
178   if (AcquireImageColormap(image,2,exception) == MagickFalse)
179     ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
180   if (image_info->ping != MagickFalse)
181     {
182       (void) CloseBlob(image);
183       return(GetFirstImageInList(image));
184     }
185   status=SetImageExtent(image,image->columns,image->rows,exception);
186   if (status == MagickFalse)
187     return(DestroyImageList(image));
188   /*
189     Convert bi-level image to pixel packets.
190   */
191   for (y=0; y < (ssize_t) image->rows; y++)
192   {
193     q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
194     if (q == (Quantum *) NULL)
195       break;
196     bit=0;
197     byte=0;
198     for (x=0; x < (ssize_t) image->columns; x++)
199     {
200       if (bit == 0)
201         {
202           byte=ReadBlobByte(image);
203           if (byte == EOF)
204             ThrowReaderException(CorruptImageError,"CorruptImage");
205         }
206       SetPixelIndex(image,(byte & (0x01 << (7-bit))) ? 1 : 0,q);
207       bit++;
208       if (bit == 8)
209         bit=0;
210       q+=GetPixelChannels(image);
211     }
212     if (SyncAuthenticPixels(image,exception) == MagickFalse)
213       break;
214     status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
215                 image->rows);
216     if (status == MagickFalse)
217       break;
218   }
219   (void) SyncImage(image,exception);
220   if (EOFBlob(image) != MagickFalse)
221     ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
222       image->filename);
223   (void) CloseBlob(image);
224   return(GetFirstImageInList(image));
225 }
226 
227 /*
228 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
229 %                                                                             %
230 %                                                                             %
231 %                                                                             %
232 %   R e g i s t e r W B M P I m a g e                                         %
233 %                                                                             %
234 %                                                                             %
235 %                                                                             %
236 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
237 %
238 %  RegisterWBMPImage() adds attributes for the WBMP image format to
239 %  the list of supported formats.  The attributes include the image format
240 %  tag, a method to read and/or write the format, whether the format
241 %  supports the saving of more than one frame to the same file or blob,
242 %  whether the format supports native in-memory I/O, and a brief
243 %  description of the format.
244 %
245 %  The format of the RegisterWBMPImage method is:
246 %
247 %      size_t RegisterWBMPImage(void)
248 %
249 */
RegisterWBMPImage(void)250 ModuleExport size_t RegisterWBMPImage(void)
251 {
252   MagickInfo
253     *entry;
254 
255   entry=AcquireMagickInfo("WBMP","WBMP","Wireless Bitmap (level 0) image");
256   entry->decoder=(DecodeImageHandler *) ReadWBMPImage;
257   entry->encoder=(EncodeImageHandler *) WriteWBMPImage;
258   entry->flags^=CoderAdjoinFlag;
259   (void) RegisterMagickInfo(entry);
260   return(MagickImageCoderSignature);
261 }
262 
263 /*
264 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
265 %                                                                             %
266 %                                                                             %
267 %                                                                             %
268 %   U n r e g i s t e r W B M P I m a g e                                     %
269 %                                                                             %
270 %                                                                             %
271 %                                                                             %
272 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
273 %
274 %  UnregisterWBMPImage() removes format registrations made by the
275 %  WBMP module from the list of supported formats.
276 %
277 %  The format of the UnregisterWBMPImage method is:
278 %
279 %      UnregisterWBMPImage(void)
280 %
281 */
UnregisterWBMPImage(void)282 ModuleExport void UnregisterWBMPImage(void)
283 {
284   (void) UnregisterMagickInfo("WBMP");
285 }
286 
287 /*
288 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
289 %                                                                             %
290 %                                                                             %
291 %                                                                             %
292 %   W r i t e W B M P I m a g e                                               %
293 %                                                                             %
294 %                                                                             %
295 %                                                                             %
296 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
297 %
298 %  WriteWBMPImage() writes an image to a file in the Wireless Bitmap
299 %  (level 0) image format.
300 %
301 %  WriteWBMPImage was contributed by Milan Votava <votava@mageo.cz>.
302 %
303 %  The format of the WriteWBMPImage method is:
304 %
305 %      MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
306 %        Image *image,ExceptionInfo *exception)
307 %
308 %  A description of each parameter follows.
309 %
310 %    o image_info: the image info.
311 %
312 %    o image:  The image.
313 %
314 %    o exception: return any errors or warnings in this structure.
315 %
316 */
317 
WBMPWriteInteger(Image * image,const size_t value)318 static void WBMPWriteInteger(Image *image,const size_t value)
319 {
320   int
321     bits,
322     flag,
323     n;
324 
325   register ssize_t
326     i;
327 
328   unsigned char
329     buffer[5],
330     octet;
331 
332   n=1;
333   bits=28;
334   flag=MagickFalse;
335   for (i=4; i >= 0; i--)
336   {
337     octet=(unsigned char) ((value >> bits) & 0x7f);
338     if ((flag == 0) && (octet != 0))
339       {
340         flag=MagickTrue;
341         n=i+1;
342       }
343     buffer[4-i]=octet | (i && (flag || octet))*(0x01 << 7);
344     bits-=7;
345   }
346   (void) WriteBlob(image,(size_t) n,buffer+5-n);
347 }
348 
WriteWBMPImage(const ImageInfo * image_info,Image * image,ExceptionInfo * exception)349 static MagickBooleanType WriteWBMPImage(const ImageInfo *image_info,
350   Image *image,ExceptionInfo *exception)
351 {
352   MagickBooleanType
353     status;
354 
355   register const Quantum
356     *p;
357 
358   register ssize_t
359     x;
360 
361   ssize_t
362     y;
363 
364   unsigned char
365     bit,
366     byte;
367 
368   /*
369     Open output image file.
370   */
371   assert(image_info != (const ImageInfo *) NULL);
372   assert(image_info->signature == MagickCoreSignature);
373   assert(image != (Image *) NULL);
374   assert(image->signature == MagickCoreSignature);
375   if (image->debug != MagickFalse)
376     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
377   assert(exception != (ExceptionInfo *) NULL);
378   assert(exception->signature == MagickCoreSignature);
379   status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
380   if (status == MagickFalse)
381     return(status);
382   (void) TransformImageColorspace(image,sRGBColorspace,exception);
383   /*
384     Convert image to a bi-level image.
385   */
386   (void) SetImageType(image,BilevelType,exception);
387   (void) WriteBlobMSBShort(image,0);
388   WBMPWriteInteger(image,image->columns);
389   WBMPWriteInteger(image,image->rows);
390   for (y=0; y < (ssize_t) image->rows; y++)
391   {
392     p=GetVirtualPixels(image,0,y,image->columns,1,exception);
393     if (p == (const Quantum *) NULL)
394       break;
395     bit=0;
396     byte=0;
397     for (x=0; x < (ssize_t) image->columns; x++)
398     {
399       if (GetPixelLuma(image,p) >= (QuantumRange/2.0))
400         byte|=0x1 << (7-bit);
401       bit++;
402       if (bit == 8)
403         {
404           (void) WriteBlobByte(image,byte);
405           bit=0;
406           byte=0;
407         }
408       p+=GetPixelChannels(image);
409     }
410     if (bit != 0)
411       (void) WriteBlobByte(image,byte);
412     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
413       image->rows);
414     if (status == MagickFalse)
415       break;
416   }
417   (void) CloseBlob(image);
418   return(MagickTrue);
419 }
420