MagickCore 7.1.1
Convert, Edit, Or Compose Bitmap Images
Loading...
Searching...
No Matches
compress.c
1/*
2%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3% %
4% %
5% %
6% CCCC OOO M M PPPP RRRR EEEEE SSSSS SSSSS %
7% C O O MM MM P P R R E SS SS %
8% C O O M M M PPPP RRRR EEE SSS SSS %
9% C O O M M P R R E SS SS %
10% CCCC OOO M M P R R EEEEE SSSSS SSSSS %
11% %
12% %
13% MagickCore Image Compression/Decompression Methods %
14% %
15% Software Design %
16% Cristy %
17% May 1993 %
18% %
19% %
20% Copyright @ 1999 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% https://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/*
41 Include declarations.
42*/
43#include "MagickCore/studio.h"
44#include "MagickCore/attribute.h"
45#include "MagickCore/blob.h"
46#include "MagickCore/blob-private.h"
47#include "MagickCore/color-private.h"
48#include "MagickCore/cache.h"
49#include "MagickCore/compress.h"
50#include "MagickCore/constitute.h"
51#include "MagickCore/exception.h"
52#include "MagickCore/exception-private.h"
53#include "MagickCore/image-private.h"
54#include "MagickCore/list.h"
55#include "MagickCore/memory_.h"
56#include "MagickCore/monitor.h"
57#include "MagickCore/monitor-private.h"
58#include "MagickCore/option.h"
59#include "MagickCore/pixel-accessor.h"
60#include "MagickCore/resource_.h"
61#include "MagickCore/string_.h"
62#if defined(MAGICKCORE_ZLIB_DELEGATE)
63#include "zlib.h"
64#endif
65␌
66/*
67 Typedef declarations.
68*/
69struct _Ascii85Info
70{
71 ssize_t
72 offset,
73 line_break;
74
75 char
76 tuple[6];
77
78 unsigned char
79 buffer[10];
80};
81
82typedef struct HuffmanTable
83{
84 size_t
85 id,
86 code,
87 length,
88 count;
89} HuffmanTable;
90␌
91/*
92 Huffman coding declarations.
93*/
94#define TWId 23L
95#define MWId 24L
96#define TBId 25L
97#define MBId 26L
98#define EXId 27L
99
100static const HuffmanTable
101 MBTable[]=
102 {
103 { MBId, 0x0f, 10, 64 }, { MBId, 0xc8, 12, 128 },
104 { MBId, 0xc9, 12, 192 }, { MBId, 0x5b, 12, 256 },
105 { MBId, 0x33, 12, 320 }, { MBId, 0x34, 12, 384 },
106 { MBId, 0x35, 12, 448 }, { MBId, 0x6c, 13, 512 },
107 { MBId, 0x6d, 13, 576 }, { MBId, 0x4a, 13, 640 },
108 { MBId, 0x4b, 13, 704 }, { MBId, 0x4c, 13, 768 },
109 { MBId, 0x4d, 13, 832 }, { MBId, 0x72, 13, 896 },
110 { MBId, 0x73, 13, 960 }, { MBId, 0x74, 13, 1024 },
111 { MBId, 0x75, 13, 1088 }, { MBId, 0x76, 13, 1152 },
112 { MBId, 0x77, 13, 1216 }, { MBId, 0x52, 13, 1280 },
113 { MBId, 0x53, 13, 1344 }, { MBId, 0x54, 13, 1408 },
114 { MBId, 0x55, 13, 1472 }, { MBId, 0x5a, 13, 1536 },
115 { MBId, 0x5b, 13, 1600 }, { MBId, 0x64, 13, 1664 },
116 { MBId, 0x65, 13, 1728 }, { MBId, 0x00, 0, 0 }
117 };
118
119static const HuffmanTable
120 EXTable[]=
121 {
122 { EXId, 0x08, 11, 1792 }, { EXId, 0x0c, 11, 1856 },
123 { EXId, 0x0d, 11, 1920 }, { EXId, 0x12, 12, 1984 },
124 { EXId, 0x13, 12, 2048 }, { EXId, 0x14, 12, 2112 },
125 { EXId, 0x15, 12, 2176 }, { EXId, 0x16, 12, 2240 },
126 { EXId, 0x17, 12, 2304 }, { EXId, 0x1c, 12, 2368 },
127 { EXId, 0x1d, 12, 2432 }, { EXId, 0x1e, 12, 2496 },
128 { EXId, 0x1f, 12, 2560 }, { EXId, 0x00, 0, 0 }
129 };
130
131static const HuffmanTable
132 MWTable[]=
133 {
134 { MWId, 0x1b, 5, 64 }, { MWId, 0x12, 5, 128 },
135 { MWId, 0x17, 6, 192 }, { MWId, 0x37, 7, 256 },
136 { MWId, 0x36, 8, 320 }, { MWId, 0x37, 8, 384 },
137 { MWId, 0x64, 8, 448 }, { MWId, 0x65, 8, 512 },
138 { MWId, 0x68, 8, 576 }, { MWId, 0x67, 8, 640 },
139 { MWId, 0xcc, 9, 704 }, { MWId, 0xcd, 9, 768 },
140 { MWId, 0xd2, 9, 832 }, { MWId, 0xd3, 9, 896 },
141 { MWId, 0xd4, 9, 960 }, { MWId, 0xd5, 9, 1024 },
142 { MWId, 0xd6, 9, 1088 }, { MWId, 0xd7, 9, 1152 },
143 { MWId, 0xd8, 9, 1216 }, { MWId, 0xd9, 9, 1280 },
144 { MWId, 0xda, 9, 1344 }, { MWId, 0xdb, 9, 1408 },
145 { MWId, 0x98, 9, 1472 }, { MWId, 0x99, 9, 1536 },
146 { MWId, 0x9a, 9, 1600 }, { MWId, 0x18, 6, 1664 },
147 { MWId, 0x9b, 9, 1728 }, { MWId, 0x00, 0, 0 }
148 };
149
150static const HuffmanTable
151 TBTable[]=
152 {
153 { TBId, 0x37, 10, 0 }, { TBId, 0x02, 3, 1 }, { TBId, 0x03, 2, 2 },
154 { TBId, 0x02, 2, 3 }, { TBId, 0x03, 3, 4 }, { TBId, 0x03, 4, 5 },
155 { TBId, 0x02, 4, 6 }, { TBId, 0x03, 5, 7 }, { TBId, 0x05, 6, 8 },
156 { TBId, 0x04, 6, 9 }, { TBId, 0x04, 7, 10 }, { TBId, 0x05, 7, 11 },
157 { TBId, 0x07, 7, 12 }, { TBId, 0x04, 8, 13 }, { TBId, 0x07, 8, 14 },
158 { TBId, 0x18, 9, 15 }, { TBId, 0x17, 10, 16 }, { TBId, 0x18, 10, 17 },
159 { TBId, 0x08, 10, 18 }, { TBId, 0x67, 11, 19 }, { TBId, 0x68, 11, 20 },
160 { TBId, 0x6c, 11, 21 }, { TBId, 0x37, 11, 22 }, { TBId, 0x28, 11, 23 },
161 { TBId, 0x17, 11, 24 }, { TBId, 0x18, 11, 25 }, { TBId, 0xca, 12, 26 },
162 { TBId, 0xcb, 12, 27 }, { TBId, 0xcc, 12, 28 }, { TBId, 0xcd, 12, 29 },
163 { TBId, 0x68, 12, 30 }, { TBId, 0x69, 12, 31 }, { TBId, 0x6a, 12, 32 },
164 { TBId, 0x6b, 12, 33 }, { TBId, 0xd2, 12, 34 }, { TBId, 0xd3, 12, 35 },
165 { TBId, 0xd4, 12, 36 }, { TBId, 0xd5, 12, 37 }, { TBId, 0xd6, 12, 38 },
166 { TBId, 0xd7, 12, 39 }, { TBId, 0x6c, 12, 40 }, { TBId, 0x6d, 12, 41 },
167 { TBId, 0xda, 12, 42 }, { TBId, 0xdb, 12, 43 }, { TBId, 0x54, 12, 44 },
168 { TBId, 0x55, 12, 45 }, { TBId, 0x56, 12, 46 }, { TBId, 0x57, 12, 47 },
169 { TBId, 0x64, 12, 48 }, { TBId, 0x65, 12, 49 }, { TBId, 0x52, 12, 50 },
170 { TBId, 0x53, 12, 51 }, { TBId, 0x24, 12, 52 }, { TBId, 0x37, 12, 53 },
171 { TBId, 0x38, 12, 54 }, { TBId, 0x27, 12, 55 }, { TBId, 0x28, 12, 56 },
172 { TBId, 0x58, 12, 57 }, { TBId, 0x59, 12, 58 }, { TBId, 0x2b, 12, 59 },
173 { TBId, 0x2c, 12, 60 }, { TBId, 0x5a, 12, 61 }, { TBId, 0x66, 12, 62 },
174 { TBId, 0x67, 12, 63 }, { TBId, 0x00, 0, 0 }
175 };
176
177static const HuffmanTable
178 TWTable[]=
179 {
180 { TWId, 0x35, 8, 0 }, { TWId, 0x07, 6, 1 }, { TWId, 0x07, 4, 2 },
181 { TWId, 0x08, 4, 3 }, { TWId, 0x0b, 4, 4 }, { TWId, 0x0c, 4, 5 },
182 { TWId, 0x0e, 4, 6 }, { TWId, 0x0f, 4, 7 }, { TWId, 0x13, 5, 8 },
183 { TWId, 0x14, 5, 9 }, { TWId, 0x07, 5, 10 }, { TWId, 0x08, 5, 11 },
184 { TWId, 0x08, 6, 12 }, { TWId, 0x03, 6, 13 }, { TWId, 0x34, 6, 14 },
185 { TWId, 0x35, 6, 15 }, { TWId, 0x2a, 6, 16 }, { TWId, 0x2b, 6, 17 },
186 { TWId, 0x27, 7, 18 }, { TWId, 0x0c, 7, 19 }, { TWId, 0x08, 7, 20 },
187 { TWId, 0x17, 7, 21 }, { TWId, 0x03, 7, 22 }, { TWId, 0x04, 7, 23 },
188 { TWId, 0x28, 7, 24 }, { TWId, 0x2b, 7, 25 }, { TWId, 0x13, 7, 26 },
189 { TWId, 0x24, 7, 27 }, { TWId, 0x18, 7, 28 }, { TWId, 0x02, 8, 29 },
190 { TWId, 0x03, 8, 30 }, { TWId, 0x1a, 8, 31 }, { TWId, 0x1b, 8, 32 },
191 { TWId, 0x12, 8, 33 }, { TWId, 0x13, 8, 34 }, { TWId, 0x14, 8, 35 },
192 { TWId, 0x15, 8, 36 }, { TWId, 0x16, 8, 37 }, { TWId, 0x17, 8, 38 },
193 { TWId, 0x28, 8, 39 }, { TWId, 0x29, 8, 40 }, { TWId, 0x2a, 8, 41 },
194 { TWId, 0x2b, 8, 42 }, { TWId, 0x2c, 8, 43 }, { TWId, 0x2d, 8, 44 },
195 { TWId, 0x04, 8, 45 }, { TWId, 0x05, 8, 46 }, { TWId, 0x0a, 8, 47 },
196 { TWId, 0x0b, 8, 48 }, { TWId, 0x52, 8, 49 }, { TWId, 0x53, 8, 50 },
197 { TWId, 0x54, 8, 51 }, { TWId, 0x55, 8, 52 }, { TWId, 0x24, 8, 53 },
198 { TWId, 0x25, 8, 54 }, { TWId, 0x58, 8, 55 }, { TWId, 0x59, 8, 56 },
199 { TWId, 0x5a, 8, 57 }, { TWId, 0x5b, 8, 58 }, { TWId, 0x4a, 8, 59 },
200 { TWId, 0x4b, 8, 60 }, { TWId, 0x32, 8, 61 }, { TWId, 0x33, 8, 62 },
201 { TWId, 0x34, 8, 63 }, { TWId, 0x00, 0, 0 }
202 };
203␌
204/*
205%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
206% %
207% %
208% %
209% A S C I I 8 5 E n c o d e %
210% %
211% %
212% %
213%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
214%
215% ASCII85Encode() encodes data in ASCII base-85 format. ASCII base-85
216% encoding produces five ASCII printing characters from every four bytes of
217% binary data.
218%
219% The format of the ASCII85Encode method is:
220%
221% void Ascii85Encode(Image *image,const size_t code)
222%
223% A description of each parameter follows:
224%
225% o code: a binary unsigned char to encode to ASCII 85.
226%
227% o file: write the encoded ASCII character to this file.
228%
229%
230*/
231static inline void Ascii85Tuple(Ascii85Info *ascii85_info,
232 const unsigned char *magick_restrict data)
233{
234#define MaxLineExtent 36L
235
236 size_t
237 code,
238 i,
239 quantum,
240 x;
241
242 code=((((size_t) data[0] << 8) | (size_t) data[1]) << 16) |
243 ((size_t) data[2] << 8) | (size_t) data[3];
244 if (code == 0L)
245 {
246 ascii85_info->tuple[0]='z';
247 ascii85_info->tuple[1]='\0';
248 return;
249 }
250 quantum=85UL*85UL*85UL*85UL;
251 for (i=0; i < 4; i++)
252 {
253 x=(code/quantum);
254 code-=quantum*x;
255 ascii85_info->tuple[i]=(char) (x+(int) '!');
256 quantum/=85L;
257 }
258 ascii85_info->tuple[4]=(char) ((code % 85L)+(int) '!');
259 ascii85_info->tuple[5]='\0';
260}
261
262MagickExport void Ascii85Initialize(Image *image)
263{
264 /*
265 Allocate image structure.
266 */
267 if (image->ascii85 == (Ascii85Info *) NULL)
268 image->ascii85=(Ascii85Info *) AcquireMagickMemory(sizeof(*image->ascii85));
269 if (image->ascii85 == (Ascii85Info *) NULL)
270 ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
271 (void) memset(image->ascii85,0,sizeof(*image->ascii85));
272 image->ascii85->line_break=(ssize_t) (MaxLineExtent << 1);
273 image->ascii85->offset=0;
274}
275
276MagickExport void Ascii85Flush(Image *image)
277{
278 assert(image != (Image *) NULL);
279 assert(image->signature == MagickCoreSignature);
280 assert(image->ascii85 != (Ascii85Info *) NULL);
281 if (IsEventLogging() != MagickFalse)
282 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
283 if (image->ascii85->offset > 0)
284 {
285 image->ascii85->buffer[image->ascii85->offset]='\0';
286 image->ascii85->buffer[image->ascii85->offset+1]='\0';
287 image->ascii85->buffer[image->ascii85->offset+2]='\0';
288 Ascii85Tuple(image->ascii85,image->ascii85->buffer);
289 (void) WriteBlob(image,(size_t) image->ascii85->offset+1,
290 (const unsigned char *) (*image->ascii85->tuple == 'z' ? "!!!!" :
291 image->ascii85->tuple));
292 }
293 (void) WriteBlobByte(image,'~');
294 (void) WriteBlobByte(image,'>');
295 (void) WriteBlobByte(image,'\n');
296}
297
298MagickExport void Ascii85Encode(Image *image,const unsigned char code)
299{
300 char
301 *q;
302
303 unsigned char
304 *p;
305
306 ssize_t
307 n;
308
309 assert(image != (Image *) NULL);
310 assert(image->signature == MagickCoreSignature);
311 assert(image->ascii85 != (Ascii85Info *) NULL);
312 image->ascii85->buffer[image->ascii85->offset]=code;
313 image->ascii85->offset++;
314 if (image->ascii85->offset < 4)
315 return;
316 p=image->ascii85->buffer;
317 for (n=image->ascii85->offset; n >= 4; n-=4)
318 {
319 Ascii85Tuple(image->ascii85,p);
320 for (q=image->ascii85->tuple; *q != '\0'; q++)
321 {
322 image->ascii85->line_break--;
323 if ((image->ascii85->line_break < 0) && (*q != '%'))
324 {
325 (void) WriteBlobByte(image,'\n');
326 image->ascii85->line_break=2*MaxLineExtent;
327 }
328 (void) WriteBlobByte(image,(unsigned char) *q);
329 }
330 p+=8;
331 }
332 image->ascii85->offset=n;
333 p-=4;
334 for (n=0; n < 4; n++)
335 image->ascii85->buffer[n]=(*p++);
336}
337␌
338/*
339%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
340% %
341% %
342% %
343% H u f f m a n D e c o d e I m a g e %
344% %
345% %
346% %
347%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
348%
349% HuffmanDecodeImage() uncompresses an image via Huffman-coding.
350%
351% The format of the HuffmanDecodeImage method is:
352%
353% MagickBooleanType HuffmanDecodeImage(Image *image,
354% ExceptionInfo *exception)
355%
356% A description of each parameter follows:
357%
358% o image: the image.
359%
360% o exception: return any errors or warnings in this structure.
361%
362*/
363MagickExport MagickBooleanType HuffmanDecodeImage(Image *image,
364 ExceptionInfo *exception)
365{
366#define HashSize 1021L
367#define MBHashA 293L
368#define MBHashB 2695L
369#define MWHashA 3510L
370#define MWHashB 1178L
371
372#define InitializeHashTable(hash,table,a,b) \
373{ \
374 entry=table; \
375 while (entry->code != 0) \
376 { \
377 hash[((entry->length+a)*(entry->code+b)) % HashSize]=(HuffmanTable *) entry; \
378 entry++; \
379 } \
380}
381
382#define InputBit(bit) \
383{ \
384 if ((mask & 0xff) == 0) \
385 { \
386 byte=ReadBlobByte(image); \
387 if (byte == EOF) \
388 break; \
389 mask=0x80; \
390 } \
391 runlength++; \
392 bit=(size_t) ((byte & mask) != 0 ? 0x01 : 0x00); \
393 mask>>=1; \
394 if (bit != 0) \
395 runlength=0; \
396}
397
398 CacheView
399 *image_view;
400
401 const HuffmanTable
402 *entry;
403
404 HuffmanTable
405 **mb_hash,
406 **mw_hash;
407
408 int
409 byte,
410 mask;
411
412 MagickBooleanType
413 proceed;
414
415 Quantum
416 index;
417
418 size_t
419 bit,
420 code,
421 length,
422 null_lines,
423 runlength;
424
425 ssize_t
426 count,
427 i,
428 y;
429
430 unsigned char
431 *p,
432 *scanline;
433
434 unsigned int
435 bail,
436 color;
437
438 /*
439 Allocate buffers.
440 */
441 assert(image != (Image *) NULL);
442 assert(image->signature == MagickCoreSignature);
443 if (IsEventLogging() != MagickFalse)
444 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
445 if (image->blob == (BlobInfo *) NULL)
446 ThrowBinaryException(BlobError,"UnableToOpenBlob",image->filename);
447 mb_hash=(HuffmanTable **) AcquireQuantumMemory(HashSize,sizeof(*mb_hash));
448 mw_hash=(HuffmanTable **) AcquireQuantumMemory(HashSize,sizeof(*mw_hash));
449 scanline=(unsigned char *) AcquireQuantumMemory((size_t) image->columns,
450 sizeof(*scanline));
451 if ((mb_hash == (HuffmanTable **) NULL) ||
452 (mw_hash == (HuffmanTable **) NULL) ||
453 (scanline == (unsigned char *) NULL))
454 {
455 if (mb_hash != (HuffmanTable **) NULL)
456 mb_hash=(HuffmanTable **) RelinquishMagickMemory(mb_hash);
457 if (mw_hash != (HuffmanTable **) NULL)
458 mw_hash=(HuffmanTable **) RelinquishMagickMemory(mw_hash);
459 if (scanline != (unsigned char *) NULL)
460 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
461 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
462 image->filename);
463 }
464 /*
465 Initialize Huffman tables.
466 */
467 for (i=0; i < HashSize; i++)
468 {
469 mb_hash[i]=(HuffmanTable *) NULL;
470 mw_hash[i]=(HuffmanTable *) NULL;
471 }
472 InitializeHashTable(mw_hash,TWTable,MWHashA,MWHashB);
473 InitializeHashTable(mw_hash,MWTable,MWHashA,MWHashB);
474 InitializeHashTable(mw_hash,EXTable,MWHashA,MWHashB);
475 InitializeHashTable(mb_hash,TBTable,MBHashA,MBHashB);
476 InitializeHashTable(mb_hash,MBTable,MBHashA,MBHashB);
477 InitializeHashTable(mb_hash,EXTable,MBHashA,MBHashB);
478 /*
479 Uncompress 1D Huffman to runlength encoded pixels.
480 */
481 byte=0;
482 mask=0;
483 null_lines=0;
484 runlength=0;
485 while (runlength < 11)
486 InputBit(bit);
487 do { InputBit(bit); } while ((int) bit == 0);
488 image->resolution.x=204.0;
489 image->resolution.y=196.0;
490 image->units=PixelsPerInchResolution;
491 image_view=AcquireAuthenticCacheView(image,exception);
492 for (y=0; ((y < (ssize_t) image->rows) && (null_lines < 3)); )
493 {
494 Quantum
495 *magick_restrict q;
496
497 ssize_t
498 x;
499
500 /*
501 Initialize scanline to white.
502 */
503 memset(scanline,0,sizeof(*scanline)*image->columns);
504 /*
505 Decode Huffman encoded scanline.
506 */
507 color=MagickTrue;
508 code=0;
509 count=0;
510 length=0;
511 runlength=0;
512 x=0;
513 for ( ; ; )
514 {
515 if (byte == EOF)
516 break;
517 if (x >= (ssize_t) image->columns)
518 {
519 while (runlength < 11)
520 InputBit(bit);
521 do { InputBit(bit); } while ((int) bit == 0);
522 break;
523 }
524 bail=MagickFalse;
525 do
526 {
527 if (runlength < 11)
528 InputBit(bit)
529 else
530 {
531 InputBit(bit);
532 if ((int) bit != 0)
533 {
534 null_lines++;
535 if (x != 0)
536 null_lines=0;
537 bail=MagickTrue;
538 break;
539 }
540 }
541 code=(code << 1)+(size_t) bit;
542 length++;
543 } while (code == 0);
544 if (bail != MagickFalse)
545 break;
546 if (length > 13)
547 {
548 while (runlength < 11)
549 InputBit(bit);
550 do { InputBit(bit); } while ((int) bit == 0);
551 break;
552 }
553 if (color != MagickFalse)
554 {
555 if (length < 4)
556 continue;
557 entry=mw_hash[((length+MWHashA)*(code+MWHashB)) % HashSize];
558 }
559 else
560 {
561 if (length < 2)
562 continue;
563 entry=mb_hash[((length+MBHashA)*(code+MBHashB)) % HashSize];
564 }
565 if (entry == (const HuffmanTable *) NULL)
566 continue;
567 if ((entry->length != length) || (entry->code != code))
568 continue;
569 switch (entry->id)
570 {
571 case TWId:
572 case TBId:
573 {
574 count+=(ssize_t) entry->count;
575 if ((x+count) > (ssize_t) image->columns)
576 count=(ssize_t) image->columns-x;
577 if (count > 0)
578 {
579 if (color != MagickFalse)
580 {
581 x+=count;
582 count=0;
583 }
584 else
585 for ( ; count > 0; count--)
586 if ((x >= 0) && (x < (ssize_t) image->columns))
587 scanline[x++]=(unsigned char) 1;
588 }
589 color=(unsigned int)
590 ((color == MagickFalse) ? MagickTrue : MagickFalse);
591 break;
592 }
593 case MWId:
594 case MBId:
595 case EXId:
596 {
597 count+=(ssize_t) entry->count;
598 break;
599 }
600 default:
601 break;
602 }
603 code=0;
604 length=0;
605 }
606 /*
607 Transfer scanline to image pixels.
608 */
609 p=scanline;
610 q=QueueCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
611 if (q == (Quantum *) NULL)
612 break;
613 for (x=0; x < (ssize_t) image->columns; x++)
614 {
615 index=(Quantum) (*p++);
616 SetPixelIndex(image,index,q);
617 SetPixelViaPixelInfo(image,image->colormap+(ssize_t) index,q);
618 q+=GetPixelChannels(image);
619 }
620 if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
621 break;
622 proceed=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
623 image->rows);
624 if (proceed == MagickFalse)
625 break;
626 y++;
627 }
628 image_view=DestroyCacheView(image_view);
629 image->rows=(size_t) MagickMax((size_t) y-3,1);
630 image->compression=FaxCompression;
631 /*
632 Free decoder memory.
633 */
634 mw_hash=(HuffmanTable **) RelinquishMagickMemory(mw_hash);
635 mb_hash=(HuffmanTable **) RelinquishMagickMemory(mb_hash);
636 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
637 return(MagickTrue);
638}
639␌
640/*
641%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
642% %
643% %
644% %
645% H u f f m a n E n c o d e I m a g e %
646% %
647% %
648% %
649%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
650%
651% HuffmanEncodeImage() compresses an image via Huffman-coding.
652%
653% The format of the HuffmanEncodeImage method is:
654%
655% MagickBooleanType HuffmanEncodeImage(const ImageInfo *image_info,
656% Image *image,Image *inject_image,ExceptionInfo *exception)
657%
658% A description of each parameter follows:
659%
660% o image_info: the image info..
661%
662% o image: the image.
663%
664% o inject_image: inject into the image stream.
665%
666% o exception: return any errors or warnings in this structure.
667%
668*/
669MagickExport MagickBooleanType HuffmanEncodeImage(const ImageInfo *image_info,
670 Image *image,Image *inject_image,ExceptionInfo *exception)
671{
672#define HuffmanOutputCode(entry) \
673{ \
674 mask=one << (entry->length-1); \
675 while (mask != 0) \
676 { \
677 OutputBit(((entry->code & mask) != 0 ? 1 : 0)); \
678 mask>>=1; \
679 } \
680}
681
682#define OutputBit(count) \
683{ \
684DisableMSCWarning(4127) \
685 if (count > 0) \
686 byte=byte | bit; \
687RestoreMSCWarning \
688 bit>>=1; \
689 if ((int) (bit & 0xff) == 0) \
690 { \
691 if (LocaleCompare(image_info->magick,"FAX") == 0) \
692 (void) WriteBlobByte(image,(unsigned char) byte); \
693 else \
694 Ascii85Encode(image,byte); \
695 byte='\0'; \
696 bit=(unsigned char) 0x80; \
697 } \
698}
699
700 const HuffmanTable
701 *entry;
702
703 int
704 k,
705 runlength;
706
707 Image
708 *huffman_image;
709
710 MagickBooleanType
711 proceed;
712
713 ssize_t
714 i,
715 x;
716
717 const Quantum
718 *p;
719
720 unsigned char
721 *q;
722
723 size_t
724 mask,
725 one,
726 width;
727
728 ssize_t
729 n,
730 y;
731
732 unsigned char
733 byte,
734 bit,
735 *scanline;
736
737 /*
738 Allocate scanline buffer.
739 */
740 assert(image_info != (ImageInfo *) NULL);
741 assert(image_info->signature == MagickCoreSignature);
742 assert(image != (Image *) NULL);
743 assert(image->signature == MagickCoreSignature);
744 if (IsEventLogging() != MagickFalse)
745 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
746 assert(inject_image != (Image *) NULL);
747 assert(inject_image->signature == MagickCoreSignature);
748 one=1;
749 width=inject_image->columns;
750 if (LocaleCompare(image_info->magick,"FAX") == 0)
751 width=(size_t) MagickMax(inject_image->columns,1728);
752 scanline=(unsigned char *) AcquireQuantumMemory((size_t) width+1UL,
753 sizeof(*scanline));
754 if (scanline == (unsigned char *) NULL)
755 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
756 inject_image->filename);
757 (void) memset(scanline,0,width*sizeof(*scanline));
758 huffman_image=CloneImage(inject_image,0,0,MagickTrue,exception);
759 if (huffman_image == (Image *) NULL)
760 {
761 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
762 return(MagickFalse);
763 }
764 (void) SetImageType(huffman_image,BilevelType,exception);
765 byte='\0';
766 bit=(unsigned char) 0x80;
767 if (LocaleCompare(image_info->magick,"FAX") != 0)
768 Ascii85Initialize(image);
769 else
770 {
771 /*
772 End of line.
773 */
774 for (k=0; k < 11; k++)
775 OutputBit(0);
776 OutputBit(1);
777 }
778 /*
779 Compress to 1D Huffman pixels.
780 */
781 q=scanline;
782 for (y=0; y < (ssize_t) huffman_image->rows; y++)
783 {
784 p=GetVirtualPixels(huffman_image,0,y,huffman_image->columns,1,exception);
785 if (p == (const Quantum *) NULL)
786 break;
787 for (x=0; x < (ssize_t) huffman_image->columns; x++)
788 {
789 *q++=(unsigned char) (GetPixelIntensity(huffman_image,p) >=
790 ((double) QuantumRange/2.0) ? 0 : 1);
791 p+=GetPixelChannels(huffman_image);
792 }
793 /*
794 Huffman encode scanline.
795 */
796 q=scanline;
797 for (n=(ssize_t) width; n > 0; )
798 {
799 /*
800 Output white run.
801 */
802 for (runlength=0; ((n > 0) && (*q == 0)); n--)
803 {
804 q++;
805 runlength++;
806 }
807 if (runlength >= 64)
808 {
809 if (runlength < 1792)
810 entry=MWTable+((runlength/64)-1);
811 else
812 entry=EXTable+(MagickMin((size_t) runlength,2560)-1792)/64;
813 runlength-=(long) entry->count;
814 HuffmanOutputCode(entry);
815 }
816 entry=TWTable+MagickMin((size_t) runlength,63);
817 HuffmanOutputCode(entry);
818 if (n != 0)
819 {
820 /*
821 Output black run.
822 */
823 for (runlength=0; ((*q != 0) && (n > 0)); n--)
824 {
825 q++;
826 runlength++;
827 }
828 if (runlength >= 64)
829 {
830 entry=MBTable+((runlength/64)-1);
831 if (runlength >= 1792)
832 entry=EXTable+(MagickMin((size_t) runlength,2560)-1792)/64;
833 runlength-=(long) entry->count;
834 HuffmanOutputCode(entry);
835 }
836 entry=TBTable+MagickMin((size_t) runlength,63);
837 HuffmanOutputCode(entry);
838 }
839 }
840 /*
841 End of line.
842 */
843 for (k=0; k < 11; k++)
844 OutputBit(0);
845 OutputBit(1);
846 q=scanline;
847 if (GetPreviousImageInList(huffman_image) == (Image *) NULL)
848 {
849 proceed=SetImageProgress(huffman_image,LoadImageTag,
850 (MagickOffsetType) y,huffman_image->rows);
851 if (proceed == MagickFalse)
852 break;
853 }
854 }
855 /*
856 End of page.
857 */
858 for (i=0; i < 6; i++)
859 {
860 for (k=0; k < 11; k++)
861 OutputBit(0);
862 OutputBit(1);
863 }
864 /*
865 Flush bits.
866 */
867 if (((int) bit != 0x80) != 0)
868 {
869 if (LocaleCompare(image_info->magick,"FAX") == 0)
870 (void) WriteBlobByte(image,byte);
871 else
872 Ascii85Encode(image,byte);
873 }
874 if (LocaleCompare(image_info->magick,"FAX") != 0)
875 Ascii85Flush(image);
876 huffman_image=DestroyImage(huffman_image);
877 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
878 return(MagickTrue);
879}
880␌
881/*
882%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
883% %
884% %
885% %
886% L Z W E n c o d e I m a g e %
887% %
888% %
889% %
890%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
891%
892% LZWEncodeImage() compresses an image via LZW-coding specific to Postscript
893% Level II or Portable Document Format.
894%
895% The format of the LZWEncodeImage method is:
896%
897% MagickBooleanType LZWEncodeImage(Image *image,const size_t length,
898% unsigned char *magick_restrict pixels,ExceptionInfo *exception)
899%
900% A description of each parameter follows:
901%
902% o image: the image.
903%
904% o length: A value that specifies the number of pixels to compress.
905%
906% o pixels: the address of an unsigned array of characters containing the
907% pixels to compress.
908%
909% o exception: return any errors or warnings in this structure.
910%
911*/
912MagickExport MagickBooleanType LZWEncodeImage(Image *image,const size_t length,
913 unsigned char *magick_restrict pixels,ExceptionInfo *exception)
914{
915#define LZWClr 256UL /* Clear Table Marker */
916#define LZWEod 257UL /* End of Data marker */
917#define OutputCode(code) \
918{ \
919 accumulator+=code << (32-code_width-number_bits); \
920 number_bits+=code_width; \
921 while (number_bits >= 8) \
922 { \
923 (void) WriteBlobByte(image,(unsigned char) (accumulator >> 24)); \
924 accumulator=accumulator << 8; \
925 number_bits-=8; \
926 } \
927}
928
929 typedef struct _TableType
930 {
931 ssize_t
932 prefix,
933 suffix,
934 next;
935 } TableType;
936
937 ssize_t
938 i;
939
940 size_t
941 accumulator,
942 number_bits,
943 code_width,
944 last_code,
945 next_index;
946
947 ssize_t
948 index;
949
950 TableType
951 *table;
952
953 /*
954 Allocate string table.
955 */
956 assert(image != (Image *) NULL);
957 assert(image->signature == MagickCoreSignature);
958 assert(pixels != (unsigned char *) NULL);
959 assert(exception != (ExceptionInfo *) NULL);
960 assert(exception->signature == MagickCoreSignature);
961 if (IsEventLogging() != MagickFalse)
962 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
963 table=(TableType *) AcquireQuantumMemory(1UL << 12,sizeof(*table));
964 if (table == (TableType *) NULL)
965 ThrowBinaryException(ResourceLimitWarning,"MemoryAllocationFailed",
966 image->filename);
967 /*
968 Initialize variables.
969 */
970 accumulator=0;
971 code_width=9;
972 number_bits=0;
973 last_code=0;
974 OutputCode(LZWClr);
975 for (index=0; index < 256; index++)
976 {
977 table[index].prefix=(-1);
978 table[index].suffix=(ssize_t) index;
979 table[index].next=(-1);
980 }
981 next_index=LZWEod+1;
982 code_width=9;
983 last_code=(size_t) pixels[0];
984 for (i=1; i < (ssize_t) length; i++)
985 {
986 /*
987 Find string.
988 */
989 index=(ssize_t) last_code;
990 while (index != -1)
991 if ((table[index].prefix != (ssize_t) last_code) ||
992 (table[index].suffix != (ssize_t) pixels[i]))
993 index=table[index].next;
994 else
995 {
996 last_code=(size_t) index;
997 break;
998 }
999 if (last_code != (size_t) index)
1000 {
1001 /*
1002 Add string.
1003 */
1004 OutputCode(last_code);
1005 table[next_index].prefix=(ssize_t) last_code;
1006 table[next_index].suffix=(ssize_t) pixels[i];
1007 table[next_index].next=table[last_code].next;
1008 table[last_code].next=(ssize_t) next_index;
1009 next_index++;
1010 /*
1011 Did we just move up to next bit width?
1012 */
1013 if ((next_index >> code_width) != 0)
1014 {
1015 code_width++;
1016 if (code_width > 12)
1017 {
1018 /*
1019 Did we overflow the max bit width?
1020 */
1021 code_width--;
1022 OutputCode(LZWClr);
1023 for (index=0; index < 256; index++)
1024 {
1025 table[index].prefix=(-1);
1026 table[index].suffix=index;
1027 table[index].next=(-1);
1028 }
1029 next_index=LZWEod+1;
1030 code_width=9;
1031 }
1032 }
1033 last_code=(size_t) pixels[i];
1034 }
1035 }
1036 /*
1037 Flush tables.
1038 */
1039 OutputCode(last_code);
1040 OutputCode(LZWEod);
1041 if (number_bits != 0)
1042 (void) WriteBlobByte(image,(unsigned char) (accumulator >> 24));
1043 table=(TableType *) RelinquishMagickMemory(table);
1044 return(MagickTrue);
1045}
1046␌
1047/*
1048%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1049% %
1050% %
1051% %
1052% P a c k b i t s E n c o d e I m a g e %
1053% %
1054% %
1055% %
1056%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1057%
1058% PackbitsEncodeImage() compresses an image via Macintosh Packbits encoding
1059% specific to Postscript Level II or Portable Document Format. To ensure
1060% portability, the binary Packbits bytes are encoded as ASCII Base-85.
1061%
1062% The format of the PackbitsEncodeImage method is:
1063%
1064% MagickBooleanType PackbitsEncodeImage(Image *image,const size_t length,
1065% unsigned char *magick_restrict pixels)
1066%
1067% A description of each parameter follows:
1068%
1069% o image: the image.
1070%
1071% o length: A value that specifies the number of pixels to compress.
1072%
1073% o pixels: the address of an unsigned array of characters containing the
1074% pixels to compress.
1075%
1076*/
1077MagickExport MagickBooleanType PackbitsEncodeImage(Image *image,
1078 const size_t length,unsigned char *magick_restrict pixels,
1079 ExceptionInfo *exception)
1080{
1081 int
1082 count;
1083
1084 ssize_t
1085 i,
1086 j;
1087
1088 unsigned char
1089 *packbits;
1090
1091 /*
1092 Compress pixels with Packbits encoding.
1093 */
1094 assert(image != (Image *) NULL);
1095 assert(image->signature == MagickCoreSignature);
1096 assert(pixels != (unsigned char *) NULL);
1097 if (IsEventLogging() != MagickFalse)
1098 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1099 packbits=(unsigned char *) AcquireQuantumMemory(128UL,sizeof(*packbits));
1100 if (packbits == (unsigned char *) NULL)
1101 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1102 image->filename);
1103 for (i=(ssize_t) length; i != 0; )
1104 {
1105 switch (i)
1106 {
1107 case 1:
1108 {
1109 i--;
1110 (void) WriteBlobByte(image,(unsigned char) 0);
1111 (void) WriteBlobByte(image,*pixels);
1112 break;
1113 }
1114 case 2:
1115 {
1116 i-=2;
1117 (void) WriteBlobByte(image,(unsigned char) 1);
1118 (void) WriteBlobByte(image,*pixels);
1119 (void) WriteBlobByte(image,pixels[1]);
1120 break;
1121 }
1122 case 3:
1123 {
1124 i-=3;
1125 if ((*pixels == *(pixels+1)) && (*(pixels+1) == *(pixels+2)))
1126 {
1127 (void) WriteBlobByte(image,(unsigned char) ((256-3)+1));
1128 (void) WriteBlobByte(image,*pixels);
1129 break;
1130 }
1131 (void) WriteBlobByte(image,(unsigned char) 2);
1132 (void) WriteBlobByte(image,*pixels);
1133 (void) WriteBlobByte(image,pixels[1]);
1134 (void) WriteBlobByte(image,pixels[2]);
1135 break;
1136 }
1137 default:
1138 {
1139 if ((*pixels == *(pixels+1)) && (*(pixels+1) == *(pixels+2)))
1140 {
1141 /*
1142 Packed run.
1143 */
1144 count=3;
1145 while (((ssize_t) count < i) && (*pixels == *(pixels+count)))
1146 {
1147 count++;
1148 if (count >= 127)
1149 break;
1150 }
1151 i-=count;
1152 (void) WriteBlobByte(image,(unsigned char) ((256-count)+1));
1153 (void) WriteBlobByte(image,*pixels);
1154 pixels+=count;
1155 break;
1156 }
1157 /*
1158 Literal run.
1159 */
1160 count=0;
1161 while ((*(pixels+count) != *(pixels+count+1)) ||
1162 (*(pixels+count+1) != *(pixels+count+2)))
1163 {
1164 packbits[count+1]=pixels[count];
1165 count++;
1166 if (((ssize_t) count >= (i-3)) || (count >= 127))
1167 break;
1168 }
1169 i-=count;
1170 *packbits=(unsigned char) (count-1);
1171 for (j=0; j <= (ssize_t) count; j++)
1172 (void) WriteBlobByte(image,packbits[j]);
1173 pixels+=count;
1174 break;
1175 }
1176 }
1177 }
1178 (void) WriteBlobByte(image,(unsigned char) 128); /* EOD marker */
1179 packbits=(unsigned char *) RelinquishMagickMemory(packbits);
1180 return(MagickTrue);
1181}
1182␌
1183#if defined(MAGICKCORE_ZLIB_DELEGATE)
1184/*
1185%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1186% %
1187% %
1188% %
1189% Z L I B E n c o d e I m a g e %
1190% %
1191% %
1192% %
1193%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1194%
1195% ZLIBEncodeImage compresses an image via ZLIB-coding specific to
1196% Postscript Level II or Portable Document Format.
1197%
1198% The format of the ZLIBEncodeImage method is:
1199%
1200% MagickBooleanType ZLIBEncodeImage(Image *image,const size_t length,
1201% unsigned char *magick_restrict pixels,ExceptionInfo *exception)
1202%
1203% A description of each parameter follows:
1204%
1205% o file: the address of a structure of type FILE. ZLIB encoded pixels
1206% are written to this file.
1207%
1208% o length: A value that specifies the number of pixels to compress.
1209%
1210% o pixels: the address of an unsigned array of characters containing the
1211% pixels to compress.
1212%
1213% o exception: return any errors or warnings in this structure.
1214%
1215*/
1216
1217static voidpf AcquireZIPMemory(voidpf context,unsigned int items,
1218 unsigned int size)
1219{
1220 (void) context;
1221 return((voidpf) AcquireQuantumMemory(items,size));
1222}
1223
1224static void RelinquishZIPMemory(voidpf context,voidpf memory)
1225{
1226 (void) context;
1227 memory=RelinquishMagickMemory(memory);
1228}
1229
1230MagickExport MagickBooleanType ZLIBEncodeImage(Image *image,const size_t length,
1231 unsigned char *magick_restrict pixels,ExceptionInfo *exception)
1232{
1233 int
1234 status;
1235
1236 ssize_t
1237 i;
1238
1239 size_t
1240 compress_packets;
1241
1242 unsigned char
1243 *compress_pixels;
1244
1245 z_stream
1246 stream;
1247
1248 assert(image != (Image *) NULL);
1249 assert(image->signature == MagickCoreSignature);
1250 if (IsEventLogging() != MagickFalse)
1251 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1252 compress_packets=(size_t) (1.001*length+12);
1253 compress_pixels=(unsigned char *) AcquireQuantumMemory(compress_packets,
1254 sizeof(*compress_pixels));
1255 if (compress_pixels == (unsigned char *) NULL)
1256 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1257 image->filename);
1258 (void) memset(&stream,0,sizeof(stream));
1259 stream.next_in=pixels;
1260 stream.avail_in=(unsigned int) length;
1261 stream.next_out=compress_pixels;
1262 stream.avail_out=(unsigned int) compress_packets;
1263 stream.zalloc=AcquireZIPMemory;
1264 stream.zfree=RelinquishZIPMemory;
1265 stream.opaque=(voidpf) NULL;
1266 status=deflateInit(&stream,(int) (image->quality ==
1267 UndefinedCompressionQuality ? 7 : MagickMin(image->quality/10,9)));
1268 if (status == Z_OK)
1269 {
1270 status=deflate(&stream,Z_FINISH);
1271 if (status == Z_STREAM_END)
1272 status=deflateEnd(&stream);
1273 else
1274 (void) deflateEnd(&stream);
1275 compress_packets=(size_t) stream.total_out;
1276 }
1277 if (status != Z_OK)
1278 ThrowBinaryException(CoderError,"UnableToZipCompressImage",image->filename)
1279 for (i=0; i < (ssize_t) compress_packets; i++)
1280 (void) WriteBlobByte(image,compress_pixels[i]);
1281 compress_pixels=(unsigned char *) RelinquishMagickMemory(compress_pixels);
1282 return(MagickTrue);
1283}
1284#else
1285MagickExport MagickBooleanType ZLIBEncodeImage(Image *image,
1286 const size_t magick_unused(length),unsigned char *magick_unused(pixels),
1287 ExceptionInfo *exception)
1288{
1289 magick_unreferenced(length);
1290 magick_unreferenced(pixels);
1291 assert(image != (Image *) NULL);
1292 assert(image->signature == MagickCoreSignature);
1293 if (IsEventLogging() != MagickFalse)
1294 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1295 (void) ThrowMagickException(exception,GetMagickModule(),MissingDelegateError,
1296 "DelegateLibrarySupportNotBuiltIn","'%s' (ZIP)",image->filename);
1297 return(MagickFalse);
1298}
1299#endif
_Ascii85Info
Definition compress.c:70
_BlobInfo
Definition blob.c:136
_CacheView
Definition cache-view.c:66
_ExceptionInfo
Definition exception.h:102
_ImageInfo
Definition image.h:359
_Image
Definition image.h:132