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 1999-2014 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 "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)
79 typedef struct HuffmanTable
89 Huffman coding declarations.
97 static const HuffmanTable
100 { MBId, 0x0f, 10, 64 }, { MBId, 0xc8, 12, 128 },
101 { MBId, 0xc9, 12, 192 }, { MBId, 0x5b, 12, 256 },
102 { MBId, 0x33, 12, 320 }, { MBId, 0x34, 12, 384 },
103 { MBId, 0x35, 12, 448 }, { MBId, 0x6c, 13, 512 },
104 { MBId, 0x6d, 13, 576 }, { MBId, 0x4a, 13, 640 },
105 { MBId, 0x4b, 13, 704 }, { MBId, 0x4c, 13, 768 },
106 { MBId, 0x4d, 13, 832 }, { MBId, 0x72, 13, 896 },
107 { MBId, 0x73, 13, 960 }, { MBId, 0x74, 13, 1024 },
108 { MBId, 0x75, 13, 1088 }, { MBId, 0x76, 13, 1152 },
109 { MBId, 0x77, 13, 1216 }, { MBId, 0x52, 13, 1280 },
110 { MBId, 0x53, 13, 1344 }, { MBId, 0x54, 13, 1408 },
111 { MBId, 0x55, 13, 1472 }, { MBId, 0x5a, 13, 1536 },
112 { MBId, 0x5b, 13, 1600 }, { MBId, 0x64, 13, 1664 },
113 { MBId, 0x65, 13, 1728 }, { MBId, 0x00, 0, 0 }
116 static const HuffmanTable
119 { EXId, 0x08, 11, 1792 }, { EXId, 0x0c, 11, 1856 },
120 { EXId, 0x0d, 11, 1920 }, { EXId, 0x12, 12, 1984 },
121 { EXId, 0x13, 12, 2048 }, { EXId, 0x14, 12, 2112 },
122 { EXId, 0x15, 12, 2176 }, { EXId, 0x16, 12, 2240 },
123 { EXId, 0x17, 12, 2304 }, { EXId, 0x1c, 12, 2368 },
124 { EXId, 0x1d, 12, 2432 }, { EXId, 0x1e, 12, 2496 },
125 { EXId, 0x1f, 12, 2560 }, { EXId, 0x00, 0, 0 }
128 static const HuffmanTable
131 { MWId, 0x1b, 5, 64 }, { MWId, 0x12, 5, 128 },
132 { MWId, 0x17, 6, 192 }, { MWId, 0x37, 7, 256 },
133 { MWId, 0x36, 8, 320 }, { MWId, 0x37, 8, 384 },
134 { MWId, 0x64, 8, 448 }, { MWId, 0x65, 8, 512 },
135 { MWId, 0x68, 8, 576 }, { MWId, 0x67, 8, 640 },
136 { MWId, 0xcc, 9, 704 }, { MWId, 0xcd, 9, 768 },
137 { MWId, 0xd2, 9, 832 }, { MWId, 0xd3, 9, 896 },
138 { MWId, 0xd4, 9, 960 }, { MWId, 0xd5, 9, 1024 },
139 { MWId, 0xd6, 9, 1088 }, { MWId, 0xd7, 9, 1152 },
140 { MWId, 0xd8, 9, 1216 }, { MWId, 0xd9, 9, 1280 },
141 { MWId, 0xda, 9, 1344 }, { MWId, 0xdb, 9, 1408 },
142 { MWId, 0x98, 9, 1472 }, { MWId, 0x99, 9, 1536 },
143 { MWId, 0x9a, 9, 1600 }, { MWId, 0x18, 6, 1664 },
144 { MWId, 0x9b, 9, 1728 }, { MWId, 0x00, 0, 0 }
147 static const HuffmanTable
150 { TBId, 0x37, 10, 0 }, { TBId, 0x02, 3, 1 }, { TBId, 0x03, 2, 2 },
151 { TBId, 0x02, 2, 3 }, { TBId, 0x03, 3, 4 }, { TBId, 0x03, 4, 5 },
152 { TBId, 0x02, 4, 6 }, { TBId, 0x03, 5, 7 }, { TBId, 0x05, 6, 8 },
153 { TBId, 0x04, 6, 9 }, { TBId, 0x04, 7, 10 }, { TBId, 0x05, 7, 11 },
154 { TBId, 0x07, 7, 12 }, { TBId, 0x04, 8, 13 }, { TBId, 0x07, 8, 14 },
155 { TBId, 0x18, 9, 15 }, { TBId, 0x17, 10, 16 }, { TBId, 0x18, 10, 17 },
156 { TBId, 0x08, 10, 18 }, { TBId, 0x67, 11, 19 }, { TBId, 0x68, 11, 20 },
157 { TBId, 0x6c, 11, 21 }, { TBId, 0x37, 11, 22 }, { TBId, 0x28, 11, 23 },
158 { TBId, 0x17, 11, 24 }, { TBId, 0x18, 11, 25 }, { TBId, 0xca, 12, 26 },
159 { TBId, 0xcb, 12, 27 }, { TBId, 0xcc, 12, 28 }, { TBId, 0xcd, 12, 29 },
160 { TBId, 0x68, 12, 30 }, { TBId, 0x69, 12, 31 }, { TBId, 0x6a, 12, 32 },
161 { TBId, 0x6b, 12, 33 }, { TBId, 0xd2, 12, 34 }, { TBId, 0xd3, 12, 35 },
162 { TBId, 0xd4, 12, 36 }, { TBId, 0xd5, 12, 37 }, { TBId, 0xd6, 12, 38 },
163 { TBId, 0xd7, 12, 39 }, { TBId, 0x6c, 12, 40 }, { TBId, 0x6d, 12, 41 },
164 { TBId, 0xda, 12, 42 }, { TBId, 0xdb, 12, 43 }, { TBId, 0x54, 12, 44 },
165 { TBId, 0x55, 12, 45 }, { TBId, 0x56, 12, 46 }, { TBId, 0x57, 12, 47 },
166 { TBId, 0x64, 12, 48 }, { TBId, 0x65, 12, 49 }, { TBId, 0x52, 12, 50 },
167 { TBId, 0x53, 12, 51 }, { TBId, 0x24, 12, 52 }, { TBId, 0x37, 12, 53 },
168 { TBId, 0x38, 12, 54 }, { TBId, 0x27, 12, 55 }, { TBId, 0x28, 12, 56 },
169 { TBId, 0x58, 12, 57 }, { TBId, 0x59, 12, 58 }, { TBId, 0x2b, 12, 59 },
170 { TBId, 0x2c, 12, 60 }, { TBId, 0x5a, 12, 61 }, { TBId, 0x66, 12, 62 },
171 { TBId, 0x67, 12, 63 }, { TBId, 0x00, 0, 0 }
174 static const HuffmanTable
177 { TWId, 0x35, 8, 0 }, { TWId, 0x07, 6, 1 }, { TWId, 0x07, 4, 2 },
178 { TWId, 0x08, 4, 3 }, { TWId, 0x0b, 4, 4 }, { TWId, 0x0c, 4, 5 },
179 { TWId, 0x0e, 4, 6 }, { TWId, 0x0f, 4, 7 }, { TWId, 0x13, 5, 8 },
180 { TWId, 0x14, 5, 9 }, { TWId, 0x07, 5, 10 }, { TWId, 0x08, 5, 11 },
181 { TWId, 0x08, 6, 12 }, { TWId, 0x03, 6, 13 }, { TWId, 0x34, 6, 14 },
182 { TWId, 0x35, 6, 15 }, { TWId, 0x2a, 6, 16 }, { TWId, 0x2b, 6, 17 },
183 { TWId, 0x27, 7, 18 }, { TWId, 0x0c, 7, 19 }, { TWId, 0x08, 7, 20 },
184 { TWId, 0x17, 7, 21 }, { TWId, 0x03, 7, 22 }, { TWId, 0x04, 7, 23 },
185 { TWId, 0x28, 7, 24 }, { TWId, 0x2b, 7, 25 }, { TWId, 0x13, 7, 26 },
186 { TWId, 0x24, 7, 27 }, { TWId, 0x18, 7, 28 }, { TWId, 0x02, 8, 29 },
187 { TWId, 0x03, 8, 30 }, { TWId, 0x1a, 8, 31 }, { TWId, 0x1b, 8, 32 },
188 { TWId, 0x12, 8, 33 }, { TWId, 0x13, 8, 34 }, { TWId, 0x14, 8, 35 },
189 { TWId, 0x15, 8, 36 }, { TWId, 0x16, 8, 37 }, { TWId, 0x17, 8, 38 },
190 { TWId, 0x28, 8, 39 }, { TWId, 0x29, 8, 40 }, { TWId, 0x2a, 8, 41 },
191 { TWId, 0x2b, 8, 42 }, { TWId, 0x2c, 8, 43 }, { TWId, 0x2d, 8, 44 },
192 { TWId, 0x04, 8, 45 }, { TWId, 0x05, 8, 46 }, { TWId, 0x0a, 8, 47 },
193 { TWId, 0x0b, 8, 48 }, { TWId, 0x52, 8, 49 }, { TWId, 0x53, 8, 50 },
194 { TWId, 0x54, 8, 51 }, { TWId, 0x55, 8, 52 }, { TWId, 0x24, 8, 53 },
195 { TWId, 0x25, 8, 54 }, { TWId, 0x58, 8, 55 }, { TWId, 0x59, 8, 56 },
196 { TWId, 0x5a, 8, 57 }, { TWId, 0x5b, 8, 58 }, { TWId, 0x4a, 8, 59 },
197 { TWId, 0x4b, 8, 60 }, { TWId, 0x32, 8, 61 }, { TWId, 0x33, 8, 62 },
198 { TWId, 0x34, 8, 63 }, { TWId, 0x00, 0, 0 }
202 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
206 % A S C I I 8 5 E n c o d e %
210 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
212 % ASCII85Encode() encodes data in ASCII base-85 format. ASCII base-85
213 % encoding produces five ASCII printing characters from every four bytes of
216 % The format of the ASCII85Encode method is:
218 % void Ascii85Encode(Image *image,const size_t code)
220 % A description of each parameter follows:
222 % o code: a binary unsigned char to encode to ASCII 85.
224 % o file: write the encoded ASCII character to this file.
228 #define MaxLineExtent 36
230 static char *Ascii85Tuple(unsigned char *data)
243 code=((((size_t) data[0] << 8) | (size_t) data[1]) << 16) |
244 ((size_t) data[2] << 8) | (size_t) data[3];
251 quantum=85UL*85UL*85UL*85UL;
252 for (i=0; i < 4; i++)
254 x=(ssize_t) (code/quantum);
256 tuple[i]=(char) (x+(int) '!');
259 tuple[4]=(char) ((code % 85L)+(int) '!');
264 MagickExport void Ascii85Initialize(Image *image)
267 Allocate image structure.
269 if (image->ascii85 == (Ascii85Info *) NULL)
270 image->ascii85=(Ascii85Info *) AcquireMagickMemory(sizeof(*image->ascii85));
271 if (image->ascii85 == (Ascii85Info *) NULL)
272 ThrowFatalException(ResourceLimitFatalError,"MemoryAllocationFailed");
273 (void) ResetMagickMemory(image->ascii85,0,sizeof(*image->ascii85));
274 image->ascii85->line_break=MaxLineExtent << 1;
275 image->ascii85->offset=0;
278 MagickExport void Ascii85Flush(Image *image)
283 assert(image != (Image *) NULL);
284 assert(image->signature == MagickSignature);
285 if (image->debug != MagickFalse)
286 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
287 assert(image->ascii85 != (Ascii85Info *) NULL);
288 if (image->ascii85->offset > 0)
290 image->ascii85->buffer[image->ascii85->offset]='\0';
291 image->ascii85->buffer[image->ascii85->offset+1]='\0';
292 image->ascii85->buffer[image->ascii85->offset+2]='\0';
293 tuple=Ascii85Tuple(image->ascii85->buffer);
294 (void) WriteBlob(image,(size_t) image->ascii85->offset+1,
295 (const unsigned char *) (*tuple == 'z' ? "!!!!" : tuple));
297 (void) WriteBlobByte(image,'~');
298 (void) WriteBlobByte(image,'>');
299 (void) WriteBlobByte(image,'\n');
302 MagickExport void Ascii85Encode(Image *image,const unsigned char code)
307 register unsigned char
313 assert(image != (Image *) NULL);
314 assert(image->signature == MagickSignature);
315 assert(image->ascii85 != (Ascii85Info *) NULL);
316 image->ascii85->buffer[image->ascii85->offset]=code;
317 image->ascii85->offset++;
318 if (image->ascii85->offset < 4)
320 p=image->ascii85->buffer;
321 for (n=image->ascii85->offset; n >= 4; n-=4)
323 for (q=Ascii85Tuple(p); *q != '\0'; q++)
325 image->ascii85->line_break--;
326 if ((image->ascii85->line_break < 0) && (*q != '%'))
328 (void) WriteBlobByte(image,'\n');
329 image->ascii85->line_break=2*MaxLineExtent;
331 (void) WriteBlobByte(image,(unsigned char) *q);
335 image->ascii85->offset=n;
337 for (n=0; n < 4; n++)
338 image->ascii85->buffer[n]=(*p++);
342 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
346 % H u f f m a n D e c o d e I m a g e %
350 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
352 % HuffmanDecodeImage() uncompresses an image via Huffman-coding.
354 % The format of the HuffmanDecodeImage method is:
356 % MagickBooleanType HuffmanDecodeImage(Image *image,
357 % ExceptionInfo *exception)
359 % A description of each parameter follows:
361 % o image: the image.
363 % o exception: return any errors or warnings in this structure.
367 static inline size_t MagickMax(const size_t x,const size_t y)
374 static inline size_t MagickMin(const size_t x,const size_t y)
381 MagickExport MagickBooleanType HuffmanDecodeImage(Image *image,
382 ExceptionInfo *exception)
384 #define HashSize 1021
390 #define InitializeHashTable(hash,table,a,b) \
393 while (entry->code != 0) \
395 hash[((entry->length+a)*(entry->code+b)) % HashSize]=(HuffmanTable *) entry; \
400 #define InputBit(bit) \
402 if ((mask & 0xff) == 0) \
404 byte=ReadBlobByte(image); \
410 bit=(size_t) ((byte & mask) != 0 ? 0x01 : 0x00); \
438 register unsigned char
463 assert(image != (Image *) NULL);
464 assert(image->signature == MagickSignature);
465 if (image->debug != MagickFalse)
466 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
467 mb_hash=(HuffmanTable **) AcquireQuantumMemory(HashSize,sizeof(*mb_hash));
468 mw_hash=(HuffmanTable **) AcquireQuantumMemory(HashSize,sizeof(*mw_hash));
469 scanline=(unsigned char *) AcquireQuantumMemory((size_t) image->columns,
471 if ((mb_hash == (HuffmanTable **) NULL) ||
472 (mw_hash == (HuffmanTable **) NULL) ||
473 (scanline == (unsigned char *) NULL))
474 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
477 Initialize Huffman tables.
479 for (i=0; i < HashSize; i++)
481 mb_hash[i]=(HuffmanTable *) NULL;
482 mw_hash[i]=(HuffmanTable *) NULL;
484 InitializeHashTable(mw_hash,TWTable,MWHashA,MWHashB);
485 InitializeHashTable(mw_hash,MWTable,MWHashA,MWHashB);
486 InitializeHashTable(mw_hash,EXTable,MWHashA,MWHashB);
487 InitializeHashTable(mb_hash,TBTable,MBHashA,MBHashB);
488 InitializeHashTable(mb_hash,MBTable,MBHashA,MBHashB);
489 InitializeHashTable(mb_hash,EXTable,MBHashA,MBHashB);
491 Uncompress 1D Huffman to runlength encoded pixels.
497 while (runlength < 11)
499 do { InputBit(bit); } while ((int) bit == 0);
500 image->resolution.x=204.0;
501 image->resolution.y=196.0;
502 image->units=PixelsPerInchResolution;
503 image_view=AcquireAuthenticCacheView(image,exception);
504 for (y=0; ((y < (ssize_t) image->rows) && (null_lines < 3)); )
513 Initialize scanline to white.
516 for (x=0; x < (ssize_t) image->columns; x++)
517 *p++=(unsigned char) 0;
519 Decode Huffman encoded scanline.
531 if (x >= (ssize_t) image->columns)
533 while (runlength < 11)
535 do { InputBit(bit); } while ((int) bit == 0);
555 code=(code << 1)+(size_t) bit;
558 if (bail != MagickFalse)
562 while (runlength < 11)
564 do { InputBit(bit); } while ((int) bit == 0);
567 if (color != MagickFalse)
571 entry=mw_hash[((length+MWHashA)*(code+MWHashB)) % HashSize];
577 entry=mb_hash[((length+MBHashA)*(code+MBHashB)) % HashSize];
579 if (entry == (const HuffmanTable *) NULL)
581 if ((entry->length != length) || (entry->code != code))
588 count+=(ssize_t) entry->count;
589 if ((x+count) > (ssize_t) image->columns)
590 count=(ssize_t) image->columns-x;
593 if (color != MagickFalse)
599 for ( ; count > 0; count--)
600 scanline[x++]=(unsigned char) 1;
603 ((color == MagickFalse) ? MagickTrue : MagickFalse);
610 count+=(ssize_t) entry->count;
620 Transfer scanline to image pixels.
623 q=QueueCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
624 if (q == (Quantum *) NULL)
626 for (x=0; x < (ssize_t) image->columns; x++)
628 index=(Quantum) (*p++);
629 SetPixelIndex(image,index,q);
630 SetPixelInfoPixel(image,image->colormap+(ssize_t) index,q);
631 q+=GetPixelChannels(image);
633 if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
635 proceed=SetImageProgress(image,LoadImageTag,y,image->rows);
636 if (proceed == MagickFalse)
640 image_view=DestroyCacheView(image_view);
641 image->rows=(size_t) MagickMax((size_t) y-3,1);
642 image->compression=FaxCompression;
646 mw_hash=(HuffmanTable **) RelinquishMagickMemory(mw_hash);
647 mb_hash=(HuffmanTable **) RelinquishMagickMemory(mb_hash);
648 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
653 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
657 % H u f f m a n E n c o d e I m a g e %
661 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
663 % HuffmanEncodeImage() compresses an image via Huffman-coding.
665 % The format of the HuffmanEncodeImage method is:
667 % MagickBooleanType HuffmanEncodeImage(const ImageInfo *image_info,
668 % Image *image,Image *inject_image,ExceptionInfo *exception)
670 % A description of each parameter follows:
672 % o image_info: the image info..
674 % o image: the image.
676 % o inject_image: inject into the image stream.
678 % o exception: return any errors or warnings in this structure.
681 MagickExport MagickBooleanType HuffmanEncodeImage(const ImageInfo *image_info,
682 Image *image,Image *inject_image,ExceptionInfo *exception)
684 #define HuffmanOutputCode(entry) \
686 mask=one << (entry->length-1); \
689 OutputBit(((entry->code & mask) != 0 ? 1 : 0)); \
694 #define OutputBit(count) \
696 DisableMSCWarning(4127) \
701 if ((int) (bit & 0xff) == 0) \
703 if (LocaleCompare(image_info->magick,"FAX") == 0) \
704 (void) WriteBlobByte(image,(unsigned char) byte); \
706 Ascii85Encode(image,byte); \
708 bit=(unsigned char) 0x80; \
729 register const Quantum
732 register unsigned char
750 Allocate scanline buffer.
752 assert(image_info != (ImageInfo *) NULL);
753 assert(image_info->signature == MagickSignature);
754 assert(image != (Image *) NULL);
755 assert(image->signature == MagickSignature);
756 if (image->debug != MagickFalse)
757 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
758 assert(inject_image != (Image *) NULL);
759 assert(inject_image->signature == MagickSignature);
761 width=inject_image->columns;
762 if (LocaleCompare(image_info->magick,"FAX") == 0)
763 width=(size_t) MagickMax(inject_image->columns,1728);
764 scanline=(unsigned char *) AcquireQuantumMemory((size_t) width+1UL,
766 if (scanline == (unsigned char *) NULL)
767 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
768 inject_image->filename);
769 (void) ResetMagickMemory(scanline,0,width*sizeof(*scanline));
770 huffman_image=CloneImage(inject_image,0,0,MagickTrue,exception);
771 if (huffman_image == (Image *) NULL)
773 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
776 (void) SetImageType(huffman_image,BilevelType,exception);
778 bit=(unsigned char) 0x80;
779 if (LocaleCompare(image_info->magick,"FAX") != 0)
780 Ascii85Initialize(image);
786 for (k=0; k < 11; k++)
791 Compress to 1D Huffman pixels.
794 for (y=0; y < (ssize_t) huffman_image->rows; y++)
796 p=GetVirtualPixels(huffman_image,0,y,huffman_image->columns,1,exception);
797 if (p == (const Quantum *) NULL)
799 for (x=0; x < (ssize_t) huffman_image->columns; x++)
801 *q++=(unsigned char) (GetPixelIntensity(huffman_image,p) >=
802 ((double) QuantumRange/2.0) ? 0 : 1);
803 p+=GetPixelChannels(huffman_image);
806 Huffman encode scanline.
809 for (n=(ssize_t) width; n > 0; )
814 for (runlength=0; ((n > 0) && (*q == 0)); n--)
821 if (runlength < 1792)
822 entry=MWTable+((runlength/64)-1);
824 entry=EXTable+(MagickMin((size_t) runlength,2560)-1792)/64;
825 runlength-=(long) entry->count;
826 HuffmanOutputCode(entry);
828 entry=TWTable+MagickMin((size_t) runlength,63);
829 HuffmanOutputCode(entry);
835 for (runlength=0; ((*q != 0) && (n > 0)); n--)
842 entry=MBTable+((runlength/64)-1);
843 if (runlength >= 1792)
844 entry=EXTable+(MagickMin((size_t) runlength,2560)-1792)/64;
845 runlength-=(long) entry->count;
846 HuffmanOutputCode(entry);
848 entry=TBTable+MagickMin((size_t) runlength,63);
849 HuffmanOutputCode(entry);
855 for (k=0; k < 11; k++)
859 if (GetPreviousImageInList(huffman_image) == (Image *) NULL)
861 proceed=SetImageProgress(huffman_image,LoadImageTag,y,
862 huffman_image->rows);
863 if (proceed == MagickFalse)
870 for (i=0; i < 6; i++)
872 for (k=0; k < 11; k++)
879 if (((int) bit != 0x80) != 0)
881 if (LocaleCompare(image_info->magick,"FAX") == 0)
882 (void) WriteBlobByte(image,byte);
884 Ascii85Encode(image,byte);
886 if (LocaleCompare(image_info->magick,"FAX") != 0)
888 huffman_image=DestroyImage(huffman_image);
889 scanline=(unsigned char *) RelinquishMagickMemory(scanline);
894 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
898 % L Z W E n c o d e I m a g e %
902 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
904 % LZWEncodeImage() compresses an image via LZW-coding specific to Postscript
905 % Level II or Portable Document Format.
907 % The format of the LZWEncodeImage method is:
909 % MagickBooleanType LZWEncodeImage(Image *image,const size_t length,
910 % unsigned char *restrict pixels,ExceptionInfo *exception)
912 % A description of each parameter follows:
914 % o image: the image.
916 % o length: A value that specifies the number of pixels to compress.
918 % o pixels: the address of an unsigned array of characters containing the
919 % pixels to compress.
921 % o exception: return any errors or warnings in this structure.
924 MagickExport MagickBooleanType LZWEncodeImage(Image *image,const size_t length,
925 unsigned char *restrict pixels,ExceptionInfo *exception)
927 #define LZWClr 256UL /* Clear Table Marker */
928 #define LZWEod 257UL /* End of Data marker */
929 #define OutputCode(code) \
931 accumulator+=code << (32-code_width-number_bits); \
932 number_bits+=code_width; \
933 while (number_bits >= 8) \
935 (void) WriteBlobByte(image,(unsigned char) (accumulator >> 24)); \
936 accumulator=accumulator << 8; \
941 typedef struct _TableType
966 Allocate string table.
968 assert(image != (Image *) NULL);
969 assert(image->signature == MagickSignature);
970 if (image->debug != MagickFalse)
971 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
972 assert(pixels != (unsigned char *) NULL);
973 assert(exception != (ExceptionInfo *) NULL);
974 assert(exception->signature == MagickSignature);
975 table=(TableType *) AcquireQuantumMemory(1UL << 12,sizeof(*table));
976 if (table == (TableType *) NULL)
979 Initialize variables.
986 for (index=0; index < 256; index++)
988 table[index].prefix=(-1);
989 table[index].suffix=(short) index;
990 table[index].next=(-1);
994 last_code=(size_t) pixels[0];
995 for (i=1; i < (ssize_t) length; i++)
1000 index=(ssize_t) last_code;
1002 if ((table[index].prefix != (ssize_t) last_code) ||
1003 (table[index].suffix != (ssize_t) pixels[i]))
1004 index=table[index].next;
1007 last_code=(size_t) index;
1010 if (last_code != (size_t) index)
1015 OutputCode(last_code);
1016 table[next_index].prefix=(ssize_t) last_code;
1017 table[next_index].suffix=(short) pixels[i];
1018 table[next_index].next=table[last_code].next;
1019 table[last_code].next=(ssize_t) next_index;
1022 Did we just move up to next bit width?
1024 if ((next_index >> code_width) != 0)
1027 if (code_width > 12)
1030 Did we overflow the max bit width?
1034 for (index=0; index < 256; index++)
1036 table[index].prefix=(-1);
1037 table[index].suffix=index;
1038 table[index].next=(-1);
1040 next_index=LZWEod+1;
1044 last_code=(size_t) pixels[i];
1050 OutputCode(last_code);
1052 if (number_bits != 0)
1053 (void) WriteBlobByte(image,(unsigned char) (accumulator >> 24));
1054 table=(TableType *) RelinquishMagickMemory(table);
1059 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1063 % P a c k b i t s E n c o d e I m a g e %
1067 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1069 % PackbitsEncodeImage() compresses an image via Macintosh Packbits encoding
1070 % specific to Postscript Level II or Portable Document Format. To ensure
1071 % portability, the binary Packbits bytes are encoded as ASCII Base-85.
1073 % The format of the PackbitsEncodeImage method is:
1075 % MagickBooleanType PackbitsEncodeImage(Image *image,const size_t length,
1076 % unsigned char *restrict pixels)
1078 % A description of each parameter follows:
1080 % o image: the image.
1082 % o length: A value that specifies the number of pixels to compress.
1084 % o pixels: the address of an unsigned array of characters containing the
1085 % pixels to compress.
1088 MagickExport MagickBooleanType PackbitsEncodeImage(Image *image,
1089 const size_t length,unsigned char *restrict pixels,ExceptionInfo *exception)
1102 Compress pixels with Packbits encoding.
1104 assert(image != (Image *) NULL);
1105 assert(image->signature == MagickSignature);
1106 if (image->debug != MagickFalse)
1107 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1108 assert(pixels != (unsigned char *) NULL);
1109 packbits=(unsigned char *) AcquireQuantumMemory(128UL,sizeof(*packbits));
1110 if (packbits == (unsigned char *) NULL)
1111 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1113 for (i=(ssize_t) length; i != 0; )
1120 (void) WriteBlobByte(image,(unsigned char) 0);
1121 (void) WriteBlobByte(image,*pixels);
1127 (void) WriteBlobByte(image,(unsigned char) 1);
1128 (void) WriteBlobByte(image,*pixels);
1129 (void) WriteBlobByte(image,pixels[1]);
1135 if ((*pixels == *(pixels+1)) && (*(pixels+1) == *(pixels+2)))
1137 (void) WriteBlobByte(image,(unsigned char) ((256-3)+1));
1138 (void) WriteBlobByte(image,*pixels);
1141 (void) WriteBlobByte(image,(unsigned char) 2);
1142 (void) WriteBlobByte(image,*pixels);
1143 (void) WriteBlobByte(image,pixels[1]);
1144 (void) WriteBlobByte(image,pixels[2]);
1149 if ((*pixels == *(pixels+1)) && (*(pixels+1) == *(pixels+2)))
1155 while (((ssize_t) count < i) && (*pixels == *(pixels+count)))
1162 (void) WriteBlobByte(image,(unsigned char) ((256-count)+1));
1163 (void) WriteBlobByte(image,*pixels);
1171 while ((*(pixels+count) != *(pixels+count+1)) ||
1172 (*(pixels+count+1) != *(pixels+count+2)))
1174 packbits[count+1]=pixels[count];
1176 if (((ssize_t) count >= (i-3)) || (count >= 127))
1180 *packbits=(unsigned char) (count-1);
1181 for (j=0; j <= (ssize_t) count; j++)
1182 (void) WriteBlobByte(image,packbits[j]);
1188 (void) WriteBlobByte(image,(unsigned char) 128); /* EOD marker */
1189 packbits=(unsigned char *) RelinquishMagickMemory(packbits);
1193 #if defined(MAGICKCORE_ZLIB_DELEGATE)
1195 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1199 % Z L I B E n c o d e I m a g e %
1203 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1205 % ZLIBEncodeImage compresses an image via ZLIB-coding specific to
1206 % Postscript Level II or Portable Document Format.
1208 % The format of the ZLIBEncodeImage method is:
1210 % MagickBooleanType ZLIBEncodeImage(Image *image,const size_t length,
1211 % unsigned char *restrict pixels,ExceptionInfo *exception)
1213 % A description of each parameter follows:
1215 % o file: the address of a structure of type FILE. ZLIB encoded pixels
1216 % are written to this file.
1218 % o length: A value that specifies the number of pixels to compress.
1220 % o pixels: the address of an unsigned array of characters containing the
1221 % pixels to compress.
1223 % o exception: return any errors or warnings in this structure.
1227 static voidpf AcquireZIPMemory(voidpf context,unsigned int items,
1231 return((voidpf) AcquireQuantumMemory(items,size));
1234 static void RelinquishZIPMemory(voidpf context,voidpf memory)
1237 memory=RelinquishMagickMemory(memory);
1240 MagickExport MagickBooleanType ZLIBEncodeImage(Image *image,const size_t length,
1241 unsigned char *restrict pixels,ExceptionInfo *exception)
1258 assert(image != (Image *) NULL);
1259 assert(image->signature == MagickSignature);
1260 if (image->debug != MagickFalse)
1261 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1262 compress_packets=(size_t) (1.001*length+12);
1263 compress_pixels=(unsigned char *) AcquireQuantumMemory(compress_packets,
1264 sizeof(*compress_pixels));
1265 if (compress_pixels == (unsigned char *) NULL)
1266 ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1268 stream.next_in=pixels;
1269 stream.avail_in=(unsigned int) length;
1270 stream.next_out=compress_pixels;
1271 stream.avail_out=(unsigned int) compress_packets;
1272 stream.zalloc=AcquireZIPMemory;
1273 stream.zfree=RelinquishZIPMemory;
1274 stream.opaque=(voidpf) NULL;
1275 status=deflateInit(&stream,(int) (image->quality ==
1276 UndefinedCompressionQuality ? 7 : MagickMin(image->quality/10,9)));
1279 status=deflate(&stream,Z_FINISH);
1280 if (status == Z_STREAM_END)
1281 status=deflateEnd(&stream);
1283 (void) deflateEnd(&stream);
1284 compress_packets=(size_t) stream.total_out;
1287 ThrowBinaryException(CoderError,"UnableToZipCompressImage",image->filename)
1289 for (i=0; i < (ssize_t) compress_packets; i++)
1290 (void) WriteBlobByte(image,compress_pixels[i]);
1291 compress_pixels=(unsigned char *) RelinquishMagickMemory(compress_pixels);
1292 return(status == Z_OK ? MagickTrue : MagickFalse);
1295 MagickExport MagickBooleanType ZLIBEncodeImage(Image *image,
1296 const size_t magick_unused(length),unsigned char *magick_unused(pixels),
1297 ExceptionInfo *exception)
1299 assert(image != (Image *) NULL);
1300 assert(image->signature == MagickSignature);
1301 if (image->debug != MagickFalse)
1302 (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1303 (void) ThrowMagickException(exception,GetMagickModule(),MissingDelegateError,
1304 "DelegateLibrarySupportNotBuiltIn","'%s' (ZIP)",image->filename);
1305 return(MagickFalse);