2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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 %
13 % MagickCore Image Compression/Decompression Methods %
20 % Copyright 1999-2010 ImageMagick Studio LLC, a non-profit organization %
21 % dedicated to making software imaging solutions freely available. %
23 % You may not use this file except in compliance with the License. You may %
24 % obtain a copy of the License at %
26 % http://www.imagemagick.org/script/license.php %
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. %
34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
43 #include "magick/studio.h"
44 #include "magick/blob.h"
45 #include "magick/blob-private.h"
46 #include "magick/color-private.h"
47 #include "magick/cache.h"
48 #include "magick/compress.h"
49 #include "magick/constitute.h"
50 #include "magick/exception.h"
51 #include "magick/exception-private.h"
52 #include "magick/image-private.h"
53 #include "magick/list.h"
54 #include "magick/memory_.h"
55 #include "magick/monitor.h"
56 #include "magick/monitor-private.h"
57 #include "magick/option.h"
58 #include "magick/resource_.h"
59 #include "magick/string_.h"
60 #if defined(MAGICKCORE_TIFF_DELEGATE)
61 #if defined(MAGICKCORE_HAVE_TIFFCONF_H)
65 #define CCITTParam "-1"
67 #define CCITTParam "0"
69 #if defined(MAGICKCORE_ZLIB_DELEGATE)
86 typedef struct HuffmanTable
96 Huffman coding declarations.
104 static const HuffmanTable
107 { MBId, 0x0f, 10, 64 }, { MBId, 0xc8, 12, 128 },
108 { MBId, 0xc9, 12, 192 }, { MBId, 0x5b, 12, 256 },
109 { MBId, 0x33, 12, 320 }, { MBId, 0x34, 12, 384 },
110 { MBId, 0x35, 12, 448 }, { MBId, 0x6c, 13, 512 },
111 { MBId, 0x6d, 13, 576 }, { MBId, 0x4a, 13, 640 },
112 { MBId, 0x4b, 13, 704 }, { MBId, 0x4c, 13, 768 },
113 { MBId, 0x4d, 13, 832 }, { MBId, 0x72, 13, 896 },
114 { MBId, 0x73, 13, 960 }, { MBId, 0x74, 13, 1024 },
115 { MBId, 0x75, 13, 1088 }, { MBId, 0x76, 13, 1152 },
116 { MBId, 0x77, 13, 1216 }, { MBId, 0x52, 13, 1280 },
117 { MBId, 0x53, 13, 1344 }, { MBId, 0x54, 13, 1408 },
118 { MBId, 0x55, 13, 1472 }, { MBId, 0x5a, 13, 1536 },
119 { MBId, 0x5b, 13, 1600 }, { MBId, 0x64, 13, 1664 },
120 { MBId, 0x65, 13, 1728 }, { MBId, 0x00, 0, 0 }
123 static const HuffmanTable
126 { EXId, 0x08, 11, 1792 }, { EXId, 0x0c, 11, 1856 },
127 { EXId, 0x0d, 11, 1920 }, { EXId, 0x12, 12, 1984 },
128 { EXId, 0x13, 12, 2048 }, { EXId, 0x14, 12, 2112 },
129 { EXId, 0x15, 12, 2176 }, { EXId, 0x16, 12, 2240 },
130 { EXId, 0x17, 12, 2304 }, { EXId, 0x1c, 12, 2368 },
131 { EXId, 0x1d, 12, 2432 }, { EXId, 0x1e, 12, 2496 },
132 { EXId, 0x1f, 12, 2560 }, { EXId, 0x00, 0, 0 }
135 static const HuffmanTable
138 { MWId, 0x1b, 5, 64 }, { MWId, 0x12, 5, 128 },
139 { MWId, 0x17, 6, 192 }, { MWId, 0x37, 7, 256 },
140 { MWId, 0x36, 8, 320 }, { MWId, 0x37, 8, 384 },
141 { MWId, 0x64, 8, 448 }, { MWId, 0x65, 8, 512 },
142 { MWId, 0x68, 8, 576 }, { MWId, 0x67, 8, 640 },
143 { MWId, 0xcc, 9, 704 }, { MWId, 0xcd, 9, 768 },
144 { MWId, 0xd2, 9, 832 }, { MWId, 0xd3, 9, 896 },
145 { MWId, 0xd4, 9, 960 }, { MWId, 0xd5, 9, 1024 },
146 { MWId, 0xd6, 9, 1088 }, { MWId, 0xd7, 9, 1152 },
147 { MWId, 0xd8, 9, 1216 }, { MWId, 0xd9, 9, 1280 },
148 { MWId, 0xda, 9, 1344 }, { MWId, 0xdb, 9, 1408 },
149 { MWId, 0x98, 9, 1472 }, { MWId, 0x99, 9, 1536 },
150 { MWId, 0x9a, 9, 1600 }, { MWId, 0x18, 6, 1664 },
151 { MWId, 0x9b, 9, 1728 }, { MWId, 0x00, 0, 0 }
154 static const HuffmanTable
157 { TBId, 0x37, 10, 0 }, { TBId, 0x02, 3, 1 }, { TBId, 0x03, 2, 2 },
158 { TBId, 0x02, 2, 3 }, { TBId, 0x03, 3, 4 }, { TBId, 0x03, 4, 5 },
159 { TBId, 0x02, 4, 6 }, { TBId, 0x03, 5, 7 }, { TBId, 0x05, 6, 8 },
160 { TBId, 0x04, 6, 9 }, { TBId, 0x04, 7, 10 }, { TBId, 0x05, 7, 11 },
161 { TBId, 0x07, 7, 12 }, { TBId, 0x04, 8, 13 }, { TBId, 0x07, 8, 14 },
162 { TBId, 0x18, 9, 15 }, { TBId, 0x17, 10, 16 }, { TBId, 0x18, 10, 17 },
163 { TBId, 0x08, 10, 18 }, { TBId, 0x67, 11, 19 }, { TBId, 0x68, 11, 20 },
164 { TBId, 0x6c, 11, 21 }, { TBId, 0x37, 11, 22 }, { TBId, 0x28, 11, 23 },
165 { TBId, 0x17, 11, 24 }, { TBId, 0x18, 11, 25 }, { TBId, 0xca, 12, 26 },
166 { TBId, 0xcb, 12, 27 }, { TBId, 0xcc, 12, 28 }, { TBId, 0xcd, 12, 29 },
167 { TBId, 0x68, 12, 30 }, { TBId, 0x69, 12, 31 }, { TBId, 0x6a, 12, 32 },
168 { TBId, 0x6b, 12, 33 }, { TBId, 0xd2, 12, 34 }, { TBId, 0xd3, 12, 35 },
169 { TBId, 0xd4, 12, 36 }, { TBId, 0xd5, 12, 37 }, { TBId, 0xd6, 12, 38 },
170 { TBId, 0xd7, 12, 39 }, { TBId, 0x6c, 12, 40 }, { TBId, 0x6d, 12, 41 },
171 { TBId, 0xda, 12, 42 }, { TBId, 0xdb, 12, 43 }, { TBId, 0x54, 12, 44 },
172 { TBId, 0x55, 12, 45 }, { TBId, 0x56, 12, 46 }, { TBId, 0x57, 12, 47 },
173 { TBId, 0x64, 12, 48 }, { TBId, 0x65, 12, 49 }, { TBId, 0x52, 12, 50 },
174 { TBId, 0x53, 12, 51 }, { TBId, 0x24, 12, 52 }, { TBId, 0x37, 12, 53 },
175 { TBId, 0x38, 12, 54 }, { TBId, 0x27, 12, 55 }, { TBId, 0x28, 12, 56 },
176 { TBId, 0x58, 12, 57 }, { TBId, 0x59, 12, 58 }, { TBId, 0x2b, 12, 59 },
177 { TBId, 0x2c, 12, 60 }, { TBId, 0x5a, 12, 61 }, { TBId, 0x66, 12, 62 },
178 { TBId, 0x67, 12, 63 }, { TBId, 0x00, 0, 0 }
181 static const HuffmanTable
184 { TWId, 0x35, 8, 0 }, { TWId, 0x07, 6, 1 }, { TWId, 0x07, 4, 2 },
185 { TWId, 0x08, 4, 3 }, { TWId, 0x0b, 4, 4 }, { TWId, 0x0c, 4, 5 },
186 { TWId, 0x0e, 4, 6 }, { TWId, 0x0f, 4, 7 }, { TWId, 0x13, 5, 8 },
187 { TWId, 0x14, 5, 9 }, { TWId, 0x07, 5, 10 }, { TWId, 0x08, 5, 11 },
188 { TWId, 0x08, 6, 12 }, { TWId, 0x03, 6, 13 }, { TWId, 0x34, 6, 14 },
189 { TWId, 0x35, 6, 15 }, { TWId, 0x2a, 6, 16 }, { TWId, 0x2b, 6, 17 },
190 { TWId, 0x27, 7, 18 }, { TWId, 0x0c, 7, 19 }, { TWId, 0x08, 7, 20 },
191 { TWId, 0x17, 7, 21 }, { TWId, 0x03, 7, 22 }, { TWId, 0x04, 7, 23 },
192 { TWId, 0x28, 7, 24 }, { TWId, 0x2b, 7, 25 }, { TWId, 0x13, 7, 26 },
193 { TWId, 0x24, 7, 27 }, { TWId, 0x18, 7, 28 }, { TWId, 0x02, 8, 29 },
194 { TWId, 0x03, 8, 30 }, { TWId, 0x1a, 8, 31 }, { TWId, 0x1b, 8, 32 },
195 { TWId, 0x12, 8, 33 }, { TWId, 0x13, 8, 34 }, { TWId, 0x14, 8, 35 },
196 { TWId, 0x15, 8, 36 }, { TWId, 0x16, 8, 37 }, { TWId, 0x17, 8, 38 },
197 { TWId, 0x28, 8, 39 }, { TWId, 0x29, 8, 40 }, { TWId, 0x2a, 8, 41 },
198 { TWId, 0x2b, 8, 42 }, { TWId, 0x2c, 8, 43 }, { TWId, 0x2d, 8, 44 },
199 { TWId, 0x04, 8, 45 }, { TWId, 0x05, 8, 46 }, { TWId, 0x0a, 8, 47 },
200 { TWId, 0x0b, 8, 48 }, { TWId, 0x52, 8, 49 }, { TWId, 0x53, 8, 50 },
201 { TWId, 0x54, 8, 51 }, { TWId, 0x55, 8, 52 }, { TWId, 0x24, 8, 53 },
202 { TWId, 0x25, 8, 54 }, { TWId, 0x58, 8, 55 }, { TWId, 0x59, 8, 56 },
203 { TWId, 0x5a, 8, 57 }, { TWId, 0x5b, 8, 58 }, { TWId, 0x4a, 8, 59 },
204 { TWId, 0x4b, 8, 60 }, { TWId, 0x32, 8, 61 }, { TWId, 0x33, 8, 62 },
205 { TWId, 0x34, 8, 63 }, { TWId, 0x00, 0, 0 }
209 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
213 % A S C I I 8 5 E n c o d e %
217 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
219 % ASCII85Encode() encodes data in ASCII base-85 format. ASCII base-85
220 % encoding produces five ASCII printing characters from every four bytes of
223 % The format of the ASCII85Encode method is:
225 % void Ascii85Encode(Image *image,const size_t code)
227 % A description of each parameter follows:
229 % o code: a binary unsigned char to encode to ASCII 85.
231 % o file: write the encoded ASCII character to this file.
235 #define MaxLineExtent 36
237 static char *Ascii85Tuple(unsigned char *data)
250 code=((((size_t) data[0] << 8) | (size_t) data[1]) << 16) |
251 ((size_t) data[2] << 8) | (size_t) data[3];
258 quantum=85UL*85UL*85UL*85UL;
259 for (i=0; i < 4; i++)
261 x=(ssize_t) (code/quantum);
263 tuple[i]=(char) (x+(int) '!');
266 tuple[4]=(char) ((code % 85L)+(int) '!');
271 MagickExport void Ascii85Initialize(Image *image)
274 Allocate image structure.
276 if (image->ascii85 == (Ascii85Info *) NULL)
277 image->ascii85=(Ascii85Info *) AcquireMagickMemory(sizeof(*image->ascii85));
278 if (image->ascii85 == (Ascii85Info *) NULL)
279 ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
280 (void) ResetMagickMemory(image->ascii85,0,sizeof(*image->ascii85));
281 image->ascii85->line_break=MaxLineExtent << 1;
282 image->ascii85->offset=0;
285 MagickExport void Ascii85Flush(Image *image)
290 assert(image != (Image *) NULL);
291 assert(image->signature == MagickSignature);
292 if (image->debug != MagickFalse)
293 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
294 assert(image->ascii85 != (Ascii85Info *) NULL);
295 if (image->ascii85->offset > 0)
297 image->ascii85->buffer[image->ascii85->offset]='\0';
298 image->ascii85->buffer[image->ascii85->offset+1]='\0';
299 image->ascii85->buffer[image->ascii85->offset+2]='\0';
300 tuple=Ascii85Tuple(image->ascii85->buffer);
301 (void) WriteBlob(image,(size_t) image->ascii85->offset+1,
302 (const unsigned char *) (*tuple == 'z' ? "!!!!" : tuple));
304 (void) WriteBlobByte(image,'~');
305 (void) WriteBlobByte(image,'>');
306 (void) WriteBlobByte(image,'\n');
309 MagickExport void Ascii85Encode(Image *image,const unsigned char code)
317 register unsigned char
320 assert(image != (Image *) NULL);
321 assert(image->signature == MagickSignature);
322 assert(image->ascii85 != (Ascii85Info *) NULL);
323 image->ascii85->buffer[image->ascii85->offset]=code;
324 image->ascii85->offset++;
325 if (image->ascii85->offset < 4)
327 p=image->ascii85->buffer;
328 for (n=image->ascii85->offset; n >= 4; n-=4)
330 for (q=Ascii85Tuple(p); *q != '\0'; q++)
332 image->ascii85->line_break--;
333 if ((image->ascii85->line_break < 0) && (*q != '%'))
335 (void) WriteBlobByte(image,'\n');
336 image->ascii85->line_break=2*MaxLineExtent;
338 (void) WriteBlobByte(image,(unsigned char) *q);
342 image->ascii85->offset=n;
344 for (n=0; n < 4; n++)
345 image->ascii85->buffer[n]=(*p++);
349 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
353 % H u f f m a n D e c o d e I m a g e %
357 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
359 % HuffmanDecodeImage() uncompresses an image via Huffman-coding.
361 % The format of the HuffmanDecodeImage method is:
363 % MagickBooleanType HuffmanDecodeImage(Image *image)
365 % A description of each parameter follows:
367 % o image: the image.
371 static inline size_t MagickMax(const size_t x,const size_t y)
378 static inline size_t MagickMin(const size_t x,const size_t y)
385 MagickExport MagickBooleanType HuffmanDecodeImage(Image *image)
387 #define HashSize 1021
393 #define InitializeHashTable(hash,table,a,b) \
396 while (entry->code != 0) \
398 hash[((entry->length+a)*(entry->code+b)) % HashSize]=(HuffmanTable *) entry; \
403 #define InputBit(bit) \
405 if ((mask & 0xff) == 0) \
407 byte=ReadBlobByte(image); \
413 bit=(size_t) ((byte & mask) != 0 ? 0x01 : 0x00); \
447 register unsigned char
472 assert(image != (Image *) NULL);
473 assert(image->signature == MagickSignature);
474 if (image->debug != MagickFalse)
475 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
476 mb_hash=(HuffmanTable **) AcquireQuantumMemory(HashSize,sizeof(*mb_hash));
477 mw_hash=(HuffmanTable **) AcquireQuantumMemory(HashSize,sizeof(*mw_hash));
478 scanline=(unsigned char *) AcquireQuantumMemory((size_t) image->columns,
480 if ((mb_hash == (HuffmanTable **) NULL) ||
481 (mw_hash == (HuffmanTable **) NULL) ||
482 (scanline == (unsigned char *) NULL))
483 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
486 Initialize Huffman tables.
488 for (i=0; i < HashSize; i++)
490 mb_hash[i]=(HuffmanTable *) NULL;
491 mw_hash[i]=(HuffmanTable *) NULL;
493 InitializeHashTable(mw_hash,TWTable,MWHashA,MWHashB);
494 InitializeHashTable(mw_hash,MWTable,MWHashA,MWHashB);
495 InitializeHashTable(mw_hash,EXTable,MWHashA,MWHashB);
496 InitializeHashTable(mb_hash,TBTable,MBHashA,MBHashB);
497 InitializeHashTable(mb_hash,MBTable,MBHashA,MBHashB);
498 InitializeHashTable(mb_hash,EXTable,MBHashA,MBHashB);
500 Uncompress 1D Huffman to runlength encoded pixels.
506 while (runlength < 11)
508 do { InputBit(bit); } while ((int) bit == 0);
509 image->x_resolution=204.0;
510 image->y_resolution=196.0;
511 image->units=PixelsPerInchResolution;
512 exception=(&image->exception);
513 image_view=AcquireCacheView(image);
514 for (y=0; ((y < (ssize_t) image->rows) && (null_lines < 3)); )
523 Initialize scanline to white.
526 for (x=0; x < (ssize_t) image->columns; x++)
527 *p++=(unsigned char) 0;
529 Decode Huffman encoded scanline.
541 if (x >= (ssize_t) image->columns)
543 while (runlength < 11)
545 do { InputBit(bit); } while ((int) bit == 0);
565 code=(code << 1)+(size_t) bit;
568 if (bail != MagickFalse)
572 while (runlength < 11)
574 do { InputBit(bit); } while ((int) bit == 0);
577 if (color != MagickFalse)
581 entry=mw_hash[((length+MWHashA)*(code+MWHashB)) % HashSize];
587 entry=mb_hash[((length+MBHashA)*(code+MBHashB)) % HashSize];
589 if (entry == (const HuffmanTable *) NULL)
591 if ((entry->length != length) || (entry->code != code))
598 count+=(ssize_t) entry->count;
599 if ((x+count) > (ssize_t) image->columns)
600 count=(ssize_t) image->columns-x;
603 if (color != MagickFalse)
609 for ( ; count > 0; count--)
610 scanline[x++]=(unsigned char) 1;
613 ((color == MagickFalse) ? MagickTrue : MagickFalse);
620 count+=(ssize_t) entry->count;
630 Transfer scanline to image pixels.
633 q=QueueCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
634 if (q == (PixelPacket *) NULL)
636 indexes=GetCacheViewAuthenticIndexQueue(image_view);
637 for (x=0; x < (ssize_t) image->columns; x++)
639 index=(IndexPacket) (*p++);
641 *q++=image->colormap[(ssize_t) index];
643 if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
645 proceed=SetImageProgress(image,LoadImageTag,y,image->rows);
646 if (proceed == MagickFalse)
650 image_view=DestroyCacheView(image_view);
651 image->rows=(size_t) MagickMax((size_t) y-3,1);
652 image->compression=FaxCompression;
656 mw_hash=(HuffmanTable **) RelinquishMagickMemory(mw_hash);
657 mb_hash=(HuffmanTable **) RelinquishMagickMemory(mb_hash);
658 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
663 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
667 % H u f f m a n E n c o d e I m a g e %
671 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
673 % HuffmanEncodeImage() compresses an image via Huffman-coding.
675 % The format of the HuffmanEncodeImage method is:
677 % MagickBooleanType HuffmanEncodeImage(const ImageInfo *image_info,
678 % Image *image,Image *inject_image)
680 % A description of each parameter follows:
682 % o image_info: the image info..
684 % o image: the image.
686 % o inject_image: inject into the image stream.
689 MagickExport MagickBooleanType HuffmanEncodeImage(const ImageInfo *image_info,
690 Image *image,Image *inject_image)
692 #define HuffmanOutputCode(entry) \
694 mask=one << (entry->length-1); \
697 OutputBit(((entry->code & mask) != 0 ? 1 : 0)); \
702 #define OutputBit(count) \
707 if ((int) (bit & 0xff) == 0) \
709 if (LocaleCompare(image_info->magick,"FAX") == 0) \
710 (void) WriteBlobByte(image,(unsigned char) byte); \
712 Ascii85Encode(image,byte); \
714 bit=(unsigned char) 0x80; \
742 register const PixelPacket
745 register unsigned char
759 Allocate scanline buffer.
761 assert(image_info != (ImageInfo *) NULL);
762 assert(image_info->signature == MagickSignature);
763 assert(image != (Image *) NULL);
764 assert(image->signature == MagickSignature);
765 if (image->debug != MagickFalse)
766 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
767 assert(inject_image != (Image *) NULL);
768 assert(inject_image->signature == MagickSignature);
770 width=inject_image->columns;
771 if (LocaleCompare(image_info->magick,"FAX") == 0)
772 width=(size_t) MagickMax(inject_image->columns,1728);
773 scanline=(unsigned char *) AcquireQuantumMemory((size_t) width+1UL,
775 if (scanline == (unsigned char *) NULL)
776 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
777 inject_image->filename);
778 (void) ResetMagickMemory(scanline,0,width*sizeof(*scanline));
779 huffman_image=CloneImage(inject_image,0,0,MagickTrue,&image->exception);
780 if (huffman_image == (Image *) NULL)
782 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
785 (void) SetImageType(huffman_image,BilevelType);
787 bit=(unsigned char) 0x80;
788 if (LocaleCompare(image_info->magick,"FAX") != 0)
789 Ascii85Initialize(image);
795 for (k=0; k < 11; k++)
800 Compress to 1D Huffman pixels.
802 exception=(&huffman_image->exception);
804 for (y=0; y < (ssize_t) huffman_image->rows; y++)
806 p=GetVirtualPixels(huffman_image,0,y,huffman_image->columns,1,exception);
807 if (p == (const PixelPacket *) NULL)
809 for (x=0; x < (ssize_t) huffman_image->columns; x++)
811 *q++=(unsigned char) (PixelIntensity(p) >= ((MagickRealType)
812 QuantumRange/2.0) ? 0 : 1);
816 Huffman encode scanline.
819 for (n=(ssize_t) width; n > 0; )
824 for (runlength=0; ((n > 0) && (*q == 0)); n--)
831 if (runlength < 1792)
832 entry=MWTable+((runlength/64)-1);
834 entry=EXTable+(MagickMin((size_t) runlength,2560)-1792)/64;
835 runlength-=(long) entry->count;
836 HuffmanOutputCode(entry);
838 entry=TWTable+MagickMin((size_t) runlength,63);
839 HuffmanOutputCode(entry);
845 for (runlength=0; ((*q != 0) && (n > 0)); n--)
852 entry=MBTable+((runlength/64)-1);
853 if (runlength >= 1792)
854 entry=EXTable+(MagickMin((size_t) runlength,2560)-1792)/64;
855 runlength-=(long) entry->count;
856 HuffmanOutputCode(entry);
858 entry=TBTable+MagickMin((size_t) runlength,63);
859 HuffmanOutputCode(entry);
865 for (k=0; k < 11; k++)
869 if (GetPreviousImageInList(huffman_image) == (Image *) NULL)
871 proceed=SetImageProgress(huffman_image,LoadImageTag,y,
872 huffman_image->rows);
873 if (proceed == MagickFalse)
880 for (i=0; i < 6; i++)
882 for (k=0; k < 11; k++)
889 if (((int) bit != 0x80) != 0)
891 if (LocaleCompare(image_info->magick,"FAX") == 0)
892 (void) WriteBlobByte(image,byte);
894 Ascii85Encode(image,byte);
896 if (LocaleCompare(image_info->magick,"FAX") != 0)
898 huffman_image=DestroyImage(huffman_image);
899 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
904 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
908 % L Z W E n c o d e I m a g e %
912 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
914 % LZWEncodeImage() compresses an image via LZW-coding specific to Postscript
915 % Level II or Portable Document Format.
917 % The format of the LZWEncodeImage method is:
919 % MagickBooleanType LZWEncodeImage(Image *image,const size_t length,
920 % unsigned char *pixels)
922 % A description of each parameter follows:
924 % o image: the image.
926 % o length: A value that specifies the number of pixels to compress.
928 % o pixels: the address of an unsigned array of characters containing the
929 % pixels to compress.
932 MagickExport MagickBooleanType LZWEncodeImage(Image *image,const size_t length,
933 unsigned char *pixels)
935 #define LZWClr 256UL /* Clear Table Marker */
936 #define LZWEod 257UL /* End of Data marker */
937 #define OutputCode(code) \
939 accumulator+=code << (32-code_width-number_bits); \
940 number_bits+=code_width; \
941 while (number_bits >= 8) \
943 (void) WriteBlobByte(image,(unsigned char) (accumulator >> 24)); \
944 accumulator=accumulator << 8; \
949 typedef struct _TableType
974 Allocate string table.
976 assert(image != (Image *) NULL);
977 assert(image->signature == MagickSignature);
978 if (image->debug != MagickFalse)
979 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
980 assert(pixels != (unsigned char *) NULL);
981 table=(TableType *) AcquireQuantumMemory(1UL << 12,sizeof(*table));
982 if (table == (TableType *) NULL)
985 Initialize variables.
992 for (index=0; index < 256; index++)
994 table[index].prefix=(-1);
995 table[index].suffix=(short) index;
996 table[index].next=(-1);
1000 last_code=(size_t) pixels[0];
1001 for (i=1; i < (ssize_t) length; i++)
1006 index=(ssize_t) last_code;
1008 if ((table[index].prefix != (ssize_t) last_code) ||
1009 (table[index].suffix != (ssize_t) pixels[i]))
1010 index=table[index].next;
1013 last_code=(size_t) index;
1016 if (last_code != (size_t) index)
1021 OutputCode(last_code);
1022 table[next_index].prefix=(ssize_t) last_code;
1023 table[next_index].suffix=(short) pixels[i];
1024 table[next_index].next=table[last_code].next;
1025 table[last_code].next=(ssize_t) next_index;
1028 Did we just move up to next bit width?
1030 if ((next_index >> code_width) != 0)
1033 if (code_width > 12)
1036 Did we overflow the max bit width?
1040 for (index=0; index < 256; index++)
1042 table[index].prefix=(-1);
1043 table[index].suffix=index;
1044 table[index].next=(-1);
1046 next_index=LZWEod+1;
1050 last_code=(size_t) pixels[i];
1056 OutputCode(last_code);
1058 if (number_bits != 0)
1059 (void) WriteBlobByte(image,(unsigned char) (accumulator >> 24));
1060 table=(TableType *) RelinquishMagickMemory(table);
1065 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1069 % P a c k b i t s E n c o d e I m a g e %
1073 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1075 % PackbitsEncodeImage() compresses an image via Macintosh Packbits encoding
1076 % specific to Postscript Level II or Portable Document Format. To ensure
1077 % portability, the binary Packbits bytes are encoded as ASCII Base-85.
1079 % The format of the PackbitsEncodeImage method is:
1081 % MagickBooleanType PackbitsEncodeImage(Image *image,const size_t length,
1082 % unsigned char *pixels)
1084 % A description of each parameter follows:
1086 % o image: the image.
1088 % o length: A value that specifies the number of pixels to compress.
1090 % o pixels: the address of an unsigned array of characters containing the
1091 % pixels to compress.
1094 MagickExport MagickBooleanType PackbitsEncodeImage(Image *image,
1095 const size_t length,unsigned char *pixels)
1108 Compress pixels with Packbits encoding.
1110 assert(image != (Image *) NULL);
1111 assert(image->signature == MagickSignature);
1112 if (image->debug != MagickFalse)
1113 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1114 assert(pixels != (unsigned char *) NULL);
1115 packbits=(unsigned char *) AcquireQuantumMemory(128UL,sizeof(*packbits));
1116 if (packbits == (unsigned char *) NULL)
1117 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1119 for (i=(ssize_t) length; i != 0; )
1126 (void) WriteBlobByte(image,(unsigned char) 0);
1127 (void) WriteBlobByte(image,*pixels);
1133 (void) WriteBlobByte(image,(unsigned char) 1);
1134 (void) WriteBlobByte(image,*pixels);
1135 (void) WriteBlobByte(image,pixels[1]);
1141 if ((*pixels == *(pixels+1)) && (*(pixels+1) == *(pixels+2)))
1143 (void) WriteBlobByte(image,(unsigned char) ((256-3)+1));
1144 (void) WriteBlobByte(image,*pixels);
1147 (void) WriteBlobByte(image,(unsigned char) 2);
1148 (void) WriteBlobByte(image,*pixels);
1149 (void) WriteBlobByte(image,pixels[1]);
1150 (void) WriteBlobByte(image,pixels[2]);
1155 if ((*pixels == *(pixels+1)) && (*(pixels+1) == *(pixels+2)))
1161 while (((ssize_t) count < i) && (*pixels == *(pixels+count)))
1168 (void) WriteBlobByte(image,(unsigned char) ((256-count)+1));
1169 (void) WriteBlobByte(image,*pixels);
1177 while ((*(pixels+count) != *(pixels+count+1)) ||
1178 (*(pixels+count+1) != *(pixels+count+2)))
1180 packbits[count+1]=pixels[count];
1182 if (((ssize_t) count >= (i-3)) || (count >= 127))
1186 *packbits=(unsigned char) (count-1);
1187 for (j=0; j <= (ssize_t) count; j++)
1188 (void) WriteBlobByte(image,packbits[j]);
1194 (void) WriteBlobByte(image,(unsigned char) 128); /* EOD marker */
1195 packbits=(unsigned char *) RelinquishMagickMemory(packbits);
1199 #if defined(MAGICKCORE_ZLIB_DELEGATE)
1201 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1205 % Z L I B E n c o d e I m a g e %
1209 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1211 % ZLIBEncodeImage compresses an image via ZLIB-coding specific to
1212 % Postscript Level II or Portable Document Format.
1214 % The format of the ZLIBEncodeImage method is:
1216 % MagickBooleanType ZLIBEncodeImage(Image *image,const size_t length,
1217 % unsigned char *pixels)
1219 % A description of each parameter follows:
1221 % o file: the address of a structure of type FILE. ZLIB encoded pixels
1222 % are written to this file.
1224 % o length: A value that specifies the number of pixels to compress.
1226 % o pixels: the address of an unsigned array of characters containing the
1227 % pixels to compress.
1231 static voidpf AcquireZIPMemory(voidpf context,unsigned int items,
1235 return((voidpf) AcquireQuantumMemory(items,size));
1238 static void RelinquishZIPMemory(voidpf context,voidpf memory)
1241 memory=RelinquishMagickMemory(memory);
1244 MagickExport MagickBooleanType ZLIBEncodeImage(Image *image,const size_t length,
1245 unsigned char *pixels)
1262 assert(image != (Image *) NULL);
1263 assert(image->signature == MagickSignature);
1264 if (image->debug != MagickFalse)
1265 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1266 compress_packets=(size_t) (1.001*length+12);
1267 compress_pixels=(unsigned char *) AcquireQuantumMemory(compress_packets,
1268 sizeof(*compress_pixels));
1269 if (compress_pixels == (unsigned char *) NULL)
1270 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1272 stream.next_in=pixels;
1273 stream.avail_in=(unsigned int) length;
1274 stream.next_out=compress_pixels;
1275 stream.avail_out=(unsigned int) compress_packets;
1276 stream.zalloc=AcquireZIPMemory;
1277 stream.zfree=RelinquishZIPMemory;
1278 stream.opaque=(voidpf) NULL;
1279 status=deflateInit(&stream,(int) (image->quality ==
1280 UndefinedCompressionQuality ? 7 : MagickMin(image->quality/10,9)));
1283 status=deflate(&stream,Z_FINISH);
1284 if (status == Z_STREAM_END)
1285 status=deflateEnd(&stream);
1287 (void) deflateEnd(&stream);
1288 compress_packets=(size_t) stream.total_out;
1291 ThrowBinaryException(CoderError,"UnableToZipCompressImage",image->filename)
1293 for (i=0; i < (ssize_t) compress_packets; i++)
1294 (void) WriteBlobByte(image,compress_pixels[i]);
1295 compress_pixels=(unsigned char *) RelinquishMagickMemory(compress_pixels);
1296 return(status == Z_OK ? MagickTrue : MagickFalse);
1299 MagickExport MagickBooleanType ZLIBEncodeImage(Image *image,
1300 const size_t magick_unused(length),unsigned char *magick_unused(pixels))
1302 assert(image != (Image *) NULL);
1303 assert(image->signature == MagickSignature);
1304 if (image->debug != MagickFalse)
1305 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1306 (void) ThrowMagickException(&image->exception,GetMagickModule(),
1307 MissingDelegateError,"DelegateLibrarySupportNotBuiltIn","`%s' (ZIP)",
1309 return(MagickFalse);