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*/
68static 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
101static 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
118static 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*/
250ModuleExport 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*/
282ModuleExport 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
318static 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
349static 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