granicus.if.org Git - imagemagick/blob - MagickCore/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 1999-2015 ImageMagick Studio LLC, a non-profit organization      %
  21 %  dedicated to making software imaging solutions freely available.           %
  22 %                                                                             %
  23 %  You may not use this file except in compliance with the License.  You may  %
  24 %  obtain a copy of the License at                                            %
  25 %                                                                             %
  26 %    http://www.imagemagick.org/script/license.php                            %
  27 %                                                                             %
  28 %  Unless required by applicable law or agreed to in writing, software        %
  29 %  distributed under the License is distributed on an "AS IS" BASIS,          %
  30 %  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   %
  31 %  See the License for the specific language governing permissions and        %
  32 %  limitations under the License.                                             %
  33 %                                                                             %
  34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 %
  36 %
  37 %
  38 */
  39 \f
  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 \f
  66 /*
  67   Typedef declarations.
  68 */
  69 struct _Ascii85Info
  70 {
  71   ssize_t
  72     offset,
  73     line_break;
  74
  75   unsigned char
  76     buffer[10];
  77 };
  78
  79 typedef struct HuffmanTable
  80 {
  81   size_t
  82     id,
  83     code,
  84     length,
  85     count;
  86 } HuffmanTable;
  87 \f
  88 /*
  89   Huffman coding declarations.
  90 */
  91 #define TWId  23
  92 #define MWId  24
  93 #define TBId  25
  94 #define MBId  26
  95 #define EXId  27
  96
  97 static const HuffmanTable
  98   MBTable[]=
  99   {
 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 }
 114   };
 115
 116 static const HuffmanTable
 117   EXTable[]=
 118   {
 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 }
 126   };
 127
 128 static const HuffmanTable
 129   MWTable[]=
 130   {
 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 }
 145   };
 146
 147 static const HuffmanTable
 148   TBTable[]=
 149   {
 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 }
 172   };
 173
 174 static const HuffmanTable
 175   TWTable[]=
 176   {
 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 }
 199   };
 200 \f
 201 /*
 202 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 203 %                                                                             %
 204 %                                                                             %
 205 %                                                                             %
 206 %   A S C I I 8 5 E n c o d e                                                 %
 207 %                                                                             %
 208 %                                                                             %
 209 %                                                                             %
 210 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 211 %
 212 %  ASCII85Encode() encodes data in ASCII base-85 format.  ASCII base-85
 213 %  encoding produces five ASCII printing characters from every four bytes of
 214 %  binary data.
 215 %
 216 %  The format of the ASCII85Encode method is:
 217 %
 218 %      void Ascii85Encode(Image *image,const size_t code)
 219 %
 220 %  A description of each parameter follows:
 221 %
 222 %    o code: a binary unsigned char to encode to ASCII 85.
 223 %
 224 %    o file: write the encoded ASCII character to this file.
 225 %
 226 %
 227 */
 228 #define MaxLineExtent  36
 229
 230 static char *Ascii85Tuple(unsigned char *data)
 231 {
 232   static char
 233     tuple[6];
 234
 235   register ssize_t
 236     i,
 237     x;
 238
 239   size_t
 240     code,
 241     quantum;
 242
 243   code=((((size_t) data[0] << 8) | (size_t) data[1]) << 16) |
 244     ((size_t) data[2] << 8) | (size_t) data[3];
 245   if (code == 0L)
 246     {
 247       tuple[0]='z';
 248       tuple[1]='\0';
 249       return(tuple);
 250     }
 251   quantum=85UL*85UL*85UL*85UL;
 252   for (i=0; i < 4; i++)
 253   {
 254     x=(ssize_t) (code/quantum);
 255     code-=quantum*x;
 256     tuple[i]=(char) (x+(int) '!');
 257     quantum/=85L;
 258   }
 259   tuple[4]=(char) ((code % 85L)+(int) '!');
 260   tuple[5]='\0';
 261   return(tuple);
 262 }
 263
 264 MagickExport void Ascii85Initialize(Image *image)
 265 {
 266   /*
 267     Allocate image structure.
 268   */
 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;
 276 }
 277
 278 MagickExport void Ascii85Flush(Image *image)
 279 {
 280   register char
 281     *tuple;
 282
 283   assert(image != (Image *) NULL);
 284   assert(image->signature == MagickCoreSignature);
 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)
 289     {
 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));
 296     }
 297   (void) WriteBlobByte(image,'~');
 298   (void) WriteBlobByte(image,'>');
 299   (void) WriteBlobByte(image,'\n');
 300 }
 301
 302 MagickExport void Ascii85Encode(Image *image,const unsigned char code)
 303 {
 304   register char
 305     *q;
 306
 307   register unsigned char
 308     *p;
 309
 310   ssize_t
 311     n;
 312
 313   assert(image != (Image *) NULL);
 314   assert(image->signature == MagickCoreSignature);
 315   assert(image->ascii85 != (Ascii85Info *) NULL);
 316   image->ascii85->buffer[image->ascii85->offset]=code;
 317   image->ascii85->offset++;
 318   if (image->ascii85->offset < 4)
 319     return;
 320   p=image->ascii85->buffer;
 321   for (n=image->ascii85->offset; n >= 4; n-=4)
 322   {
 323     for (q=Ascii85Tuple(p); *q != '\0'; q++)
 324     {
 325       image->ascii85->line_break--;
 326       if ((image->ascii85->line_break < 0) && (*q != '%'))
 327         {
 328           (void) WriteBlobByte(image,'\n');
 329           image->ascii85->line_break=2*MaxLineExtent;
 330         }
 331       (void) WriteBlobByte(image,(unsigned char) *q);
 332     }
 333     p+=8;
 334   }
 335   image->ascii85->offset=n;
 336   p-=4;
 337   for (n=0; n < 4; n++)
 338     image->ascii85->buffer[n]=(*p++);
 339 }
 340 \f
 341 /*
 342 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 343 %                                                                             %
 344 %                                                                             %
 345 %                                                                             %
 346 %   H u f f m a n D e c o d e I m a g e                                       %
 347 %                                                                             %
 348 %                                                                             %
 349 %                                                                             %
 350 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 351 %
 352 %  HuffmanDecodeImage() uncompresses an image via Huffman-coding.
 353 %
 354 %  The format of the HuffmanDecodeImage method is:
 355 %
 356 %      MagickBooleanType HuffmanDecodeImage(Image *image,
 357 %        ExceptionInfo *exception)
 358 %
 359 %  A description of each parameter follows:
 360 %
 361 %    o image: the image.
 362 %
 363 %    o exception: return any errors or warnings in this structure.
 364 %
 365 */
 366 MagickExport MagickBooleanType HuffmanDecodeImage(Image *image,
 367   ExceptionInfo *exception)
 368 {
 369 #define HashSize  1021
 370 #define MBHashA  293
 371 #define MBHashB  2695
 372 #define MWHashA  3510
 373 #define MWHashB  1178
 374
 375 #define InitializeHashTable(hash,table,a,b) \
 376 { \
 377   entry=table; \
 378   while (entry->code != 0) \
 379   {  \
 380     hash[((entry->length+a)*(entry->code+b)) % HashSize]=(HuffmanTable *) entry; \
 381     entry++; \
 382   } \
 383 }
 384
 385 #define InputBit(bit)  \
 386 {  \
 387   if ((mask & 0xff) == 0)  \
 388     {  \
 389       byte=ReadBlobByte(image);  \
 390       if (byte == EOF)  \
 391         break;  \
 392       mask=0x80;  \
 393     }  \
 394   runlength++;  \
 395   bit=(size_t) ((byte & mask) != 0 ? 0x01 : 0x00); \
 396   mask>>=1;  \
 397   if (bit != 0)  \
 398     runlength=0;  \
 399 }
 400
 401   CacheView
 402     *image_view;
 403
 404   const HuffmanTable
 405     *entry;
 406
 407   HuffmanTable
 408     **mb_hash,
 409     **mw_hash;
 410
 411   int
 412     byte;
 413
 414   MagickBooleanType
 415     proceed;
 416
 417   Quantum
 418     index;
 419
 420   register ssize_t
 421     i;
 422
 423   register unsigned char
 424     *p;
 425
 426   size_t
 427     bit,
 428     code,
 429     mask,
 430     length,
 431     null_lines,
 432     runlength;
 433
 434   ssize_t
 435     count,
 436     y;
 437
 438   unsigned char
 439     *scanline;
 440
 441   unsigned int
 442     bail,
 443     color;
 444
 445   /*
 446     Allocate buffers.
 447   */
 448   assert(image != (Image *) NULL);
 449   assert(image->signature == MagickCoreSignature);
 450   if (image->debug != MagickFalse)
 451     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 452   mb_hash=(HuffmanTable **) AcquireQuantumMemory(HashSize,sizeof(*mb_hash));
 453   mw_hash=(HuffmanTable **) AcquireQuantumMemory(HashSize,sizeof(*mw_hash));
 454   scanline=(unsigned char *) AcquireQuantumMemory((size_t) image->columns,
 455     sizeof(*scanline));
 456   if ((mb_hash == (HuffmanTable **) NULL) ||
 457       (mw_hash == (HuffmanTable **) NULL) ||
 458       (scanline == (unsigned char *) NULL))
 459     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 460       image->filename);
 461   /*
 462     Initialize Huffman tables.
 463   */
 464   for (i=0; i < HashSize; i++)
 465   {
 466     mb_hash[i]=(HuffmanTable *) NULL;
 467     mw_hash[i]=(HuffmanTable *) NULL;
 468   }
 469   InitializeHashTable(mw_hash,TWTable,MWHashA,MWHashB);
 470   InitializeHashTable(mw_hash,MWTable,MWHashA,MWHashB);
 471   InitializeHashTable(mw_hash,EXTable,MWHashA,MWHashB);
 472   InitializeHashTable(mb_hash,TBTable,MBHashA,MBHashB);
 473   InitializeHashTable(mb_hash,MBTable,MBHashA,MBHashB);
 474   InitializeHashTable(mb_hash,EXTable,MBHashA,MBHashB);
 475   /*
 476     Uncompress 1D Huffman to runlength encoded pixels.
 477   */
 478   byte=0;
 479   mask=0;
 480   null_lines=0;
 481   runlength=0;
 482   while (runlength < 11)
 483    InputBit(bit);
 484   do { InputBit(bit); } while ((int) bit == 0);
 485   image->resolution.x=204.0;
 486   image->resolution.y=196.0;
 487   image->units=PixelsPerInchResolution;
 488   image_view=AcquireAuthenticCacheView(image,exception);
 489   for (y=0; ((y < (ssize_t) image->rows) && (null_lines < 3)); )
 490   {
 491     register Quantum
 492       *restrict q;
 493
 494     register ssize_t
 495       x;
 496
 497     /*
 498       Initialize scanline to white.
 499     */
 500     p=scanline;
 501     for (x=0; x < (ssize_t) image->columns; x++)
 502       *p++=(unsigned char) 0;
 503     /*
 504       Decode Huffman encoded scanline.
 505     */
 506     color=MagickTrue;
 507     code=0;
 508     count=0;
 509     length=0;
 510     runlength=0;
 511     x=0;
 512     for ( ; ; )
 513     {
 514       if (byte == EOF)
 515         break;
 516       if (x >= (ssize_t) image->columns)
 517         {
 518           while (runlength < 11)
 519             InputBit(bit);
 520           do { InputBit(bit); } while ((int) bit == 0);
 521           break;
 522         }
 523       bail=MagickFalse;
 524       do
 525       {
 526         if (runlength < 11)
 527           InputBit(bit)
 528         else
 529           {
 530             InputBit(bit);
 531             if ((int) bit != 0)
 532               {
 533                 null_lines++;
 534                 if (x != 0)
 535                   null_lines=0;
 536                 bail=MagickTrue;
 537                 break;
 538               }
 539           }
 540         code=(code << 1)+(size_t) bit;
 541         length++;
 542       } while (code == 0);
 543       if (bail != MagickFalse)
 544         break;
 545       if (length > 13)
 546         {
 547           while (runlength < 11)
 548            InputBit(bit);
 549           do { InputBit(bit); } while ((int) bit == 0);
 550           break;
 551         }
 552       if (color != MagickFalse)
 553         {
 554           if (length < 4)
 555             continue;
 556           entry=mw_hash[((length+MWHashA)*(code+MWHashB)) % HashSize];
 557         }
 558       else
 559         {
 560           if (length < 2)
 561             continue;
 562           entry=mb_hash[((length+MBHashA)*(code+MBHashB)) % HashSize];
 563         }
 564       if (entry == (const HuffmanTable *) NULL)
 565         continue;
 566       if ((entry->length != length) || (entry->code != code))
 567         continue;
 568       switch (entry->id)
 569       {
 570         case TWId:
 571         case TBId:
 572         {
 573           count+=(ssize_t) entry->count;
 574           if ((x+count) > (ssize_t) image->columns)
 575             count=(ssize_t) image->columns-x;
 576           if (count > 0)
 577             {
 578               if (color != MagickFalse)
 579                 {
 580                   x+=count;
 581                   count=0;
 582                 }
 583               else
 584                 for ( ; count > 0; count--)
 585                   scanline[x++]=(unsigned char) 1;
 586             }
 587           color=(unsigned int)
 588             ((color == MagickFalse) ? MagickTrue : MagickFalse);
 589           break;
 590         }
 591         case MWId:
 592         case MBId:
 593         case EXId:
 594         {
 595           count+=(ssize_t) entry->count;
 596           break;
 597         }
 598         default:
 599           break;
 600       }
 601       code=0;
 602       length=0;
 603     }
 604     /*
 605       Transfer scanline to image pixels.
 606     */
 607     p=scanline;
 608     q=QueueCacheViewAuthenticPixels(image_view,0,y,image->columns,1,exception);
 609     if (q == (Quantum *) NULL)
 610       break;
 611     for (x=0; x < (ssize_t) image->columns; x++)
 612     {
 613       index=(Quantum) (*p++);
 614       SetPixelIndex(image,index,q);
 615       SetPixelViaPixelInfo(image,image->colormap+(ssize_t) index,q);
 616       q+=GetPixelChannels(image);
 617     }
 618     if (SyncCacheViewAuthenticPixels(image_view,exception) == MagickFalse)
 619       break;
 620     proceed=SetImageProgress(image,LoadImageTag,y,image->rows);
 621     if (proceed == MagickFalse)
 622       break;
 623     y++;
 624   }
 625   image_view=DestroyCacheView(image_view);
 626   image->rows=(size_t) MagickMax((size_t) y-3,1);
 627   image->compression=FaxCompression;
 628   /*
 629     Free decoder memory.
 630   */
 631   mw_hash=(HuffmanTable **) RelinquishMagickMemory(mw_hash);
 632   mb_hash=(HuffmanTable **) RelinquishMagickMemory(mb_hash);
 633   scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 634   return(MagickTrue);
 635 }
 636 \f
 637 /*
 638 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 639 %                                                                             %
 640 %                                                                             %
 641 %                                                                             %
 642 %   H u f f m a n E n c o d e I m a g e                                       %
 643 %                                                                             %
 644 %                                                                             %
 645 %                                                                             %
 646 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 647 %
 648 %  HuffmanEncodeImage() compresses an image via Huffman-coding.
 649 %
 650 %  The format of the HuffmanEncodeImage method is:
 651 %
 652 %      MagickBooleanType HuffmanEncodeImage(const ImageInfo *image_info,
 653 %        Image *image,Image *inject_image,ExceptionInfo *exception)
 654 %
 655 %  A description of each parameter follows:
 656 %
 657 %    o image_info: the image info..
 658 %
 659 %    o image: the image.
 660 %
 661 %    o inject_image: inject into the image stream.
 662 %
 663 %    o exception: return any errors or warnings in this structure.
 664 %
 665 */
 666 MagickExport MagickBooleanType HuffmanEncodeImage(const ImageInfo *image_info,
 667   Image *image,Image *inject_image,ExceptionInfo *exception)
 668 {
 669 #define HuffmanOutputCode(entry)  \
 670 {  \
 671   mask=one << (entry->length-1);  \
 672   while (mask != 0)  \
 673   {  \
 674     OutputBit(((entry->code & mask) != 0 ? 1 : 0));  \
 675     mask>>=1;  \
 676   }  \
 677 }
 678
 679 #define OutputBit(count)  \
 680 {  \
 681 DisableMSCWarning(4127) \
 682   if (count > 0)  \
 683     byte=byte | bit;  \
 684 RestoreMSCWarning \
 685   bit>>=1;  \
 686   if ((int) (bit & 0xff) == 0)   \
 687     {  \
 688       if (LocaleCompare(image_info->magick,"FAX") == 0) \
 689         (void) WriteBlobByte(image,(unsigned char) byte);  \
 690       else \
 691         Ascii85Encode(image,byte); \
 692       byte='\0';  \
 693       bit=(unsigned char) 0x80;  \
 694     }  \
 695 }
 696
 697   const HuffmanTable
 698     *entry;
 699
 700   int
 701     k,
 702     runlength;
 703
 704   Image
 705     *huffman_image;
 706
 707   MagickBooleanType
 708     proceed;
 709
 710   register ssize_t
 711     i,
 712     x;
 713
 714   register const Quantum
 715     *p;
 716
 717   register unsigned char
 718     *q;
 719
 720   size_t
 721     mask,
 722     one,
 723     width;
 724
 725   ssize_t
 726     n,
 727     y;
 728
 729   unsigned char
 730     byte,
 731     bit,
 732     *scanline;
 733
 734   /*
 735     Allocate scanline buffer.
 736   */
 737   assert(image_info != (ImageInfo *) NULL);
 738   assert(image_info->signature == MagickCoreSignature);
 739   assert(image != (Image *) NULL);
 740   assert(image->signature == MagickCoreSignature);
 741   if (image->debug != MagickFalse)
 742     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 743   assert(inject_image != (Image *) NULL);
 744   assert(inject_image->signature == MagickCoreSignature);
 745   one=1;
 746   width=inject_image->columns;
 747   if (LocaleCompare(image_info->magick,"FAX") == 0)
 748     width=(size_t) MagickMax(inject_image->columns,1728);
 749   scanline=(unsigned char *) AcquireQuantumMemory((size_t) width+1UL,
 750     sizeof(*scanline));
 751   if (scanline == (unsigned char *) NULL)
 752     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
 753       inject_image->filename);
 754   (void) ResetMagickMemory(scanline,0,width*sizeof(*scanline));
 755   huffman_image=CloneImage(inject_image,0,0,MagickTrue,exception);
 756   if (huffman_image == (Image *) NULL)
 757     {
 758       scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 759       return(MagickFalse);
 760     }
 761   (void) SetImageType(huffman_image,BilevelType,exception);
 762   byte='\0';
 763   bit=(unsigned char) 0x80;
 764   if (LocaleCompare(image_info->magick,"FAX") != 0)
 765     Ascii85Initialize(image);
 766   else
 767     {
 768       /*
 769         End of line.
 770       */
 771       for (k=0; k < 11; k++)
 772         OutputBit(0);
 773       OutputBit(1);
 774     }
 775   /*
 776     Compress to 1D Huffman pixels.
 777   */
 778   q=scanline;
 779   for (y=0; y < (ssize_t) huffman_image->rows; y++)
 780   {
 781     p=GetVirtualPixels(huffman_image,0,y,huffman_image->columns,1,exception);
 782     if (p == (const Quantum *) NULL)
 783       break;
 784     for (x=0; x < (ssize_t) huffman_image->columns; x++)
 785     {
 786       *q++=(unsigned char) (GetPixelIntensity(huffman_image,p) >=
 787         ((double) QuantumRange/2.0) ? 0 : 1);
 788       p+=GetPixelChannels(huffman_image);
 789     }
 790     /*
 791       Huffman encode scanline.
 792     */
 793     q=scanline;
 794     for (n=(ssize_t) width; n > 0; )
 795     {
 796       /*
 797         Output white run.
 798       */
 799       for (runlength=0; ((n > 0) && (*q == 0)); n--)
 800       {
 801         q++;
 802         runlength++;
 803       }
 804       if (runlength >= 64)
 805         {
 806           if (runlength < 1792)
 807             entry=MWTable+((runlength/64)-1);
 808           else
 809             entry=EXTable+(MagickMin((size_t) runlength,2560)-1792)/64;
 810           runlength-=(long) entry->count;
 811           HuffmanOutputCode(entry);
 812         }
 813       entry=TWTable+MagickMin((size_t) runlength,63);
 814       HuffmanOutputCode(entry);
 815       if (n != 0)
 816         {
 817           /*
 818             Output black run.
 819           */
 820           for (runlength=0; ((*q != 0) && (n > 0)); n--)
 821           {
 822             q++;
 823             runlength++;
 824           }
 825           if (runlength >= 64)
 826             {
 827               entry=MBTable+((runlength/64)-1);
 828               if (runlength >= 1792)
 829                 entry=EXTable+(MagickMin((size_t) runlength,2560)-1792)/64;
 830               runlength-=(long) entry->count;
 831               HuffmanOutputCode(entry);
 832             }
 833           entry=TBTable+MagickMin((size_t) runlength,63);
 834           HuffmanOutputCode(entry);
 835         }
 836     }
 837     /*
 838       End of line.
 839     */
 840     for (k=0; k < 11; k++)
 841       OutputBit(0);
 842     OutputBit(1);
 843     q=scanline;
 844     if (GetPreviousImageInList(huffman_image) == (Image *) NULL)
 845       {
 846         proceed=SetImageProgress(huffman_image,LoadImageTag,y,
 847           huffman_image->rows);
 848         if (proceed == MagickFalse)
 849           break;
 850       }
 851   }
 852   /*
 853     End of page.
 854   */
 855   for (i=0; i < 6; i++)
 856   {
 857     for (k=0; k < 11; k++)
 858       OutputBit(0);
 859     OutputBit(1);
 860   }
 861   /*
 862     Flush bits.
 863   */
 864   if (((int) bit != 0x80) != 0)
 865     {
 866       if (LocaleCompare(image_info->magick,"FAX") == 0)
 867         (void) WriteBlobByte(image,byte);
 868       else
 869         Ascii85Encode(image,byte);
 870     }
 871   if (LocaleCompare(image_info->magick,"FAX") != 0)
 872     Ascii85Flush(image);
 873   huffman_image=DestroyImage(huffman_image);
 874   scanline=(unsigned char *) RelinquishMagickMemory(scanline);
 875   return(MagickTrue);
 876 }
 877 \f
 878 /*
 879 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 880 %                                                                             %
 881 %                                                                             %
 882 %                                                                             %
 883 %   L Z W E n c o d e I m a g e                                               %
 884 %                                                                             %
 885 %                                                                             %
 886 %                                                                             %
 887 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 888 %
 889 %  LZWEncodeImage() compresses an image via LZW-coding specific to Postscript
 890 %  Level II or Portable Document Format.
 891 %
 892 %  The format of the LZWEncodeImage method is:
 893 %
 894 %      MagickBooleanType LZWEncodeImage(Image *image,const size_t length,
 895 %        unsigned char *restrict pixels,ExceptionInfo *exception)
 896 %
 897 %  A description of each parameter follows:
 898 %
 899 %    o image: the image.
 900 %
 901 %    o length:  A value that specifies the number of pixels to compress.
 902 %
 903 %    o pixels: the address of an unsigned array of characters containing the
 904 %      pixels to compress.
 905 %
 906 %    o exception: return any errors or warnings in this structure.
 907 %
 908 */
 909 MagickExport MagickBooleanType LZWEncodeImage(Image *image,const size_t length,
 910   unsigned char *restrict pixels,ExceptionInfo *exception)
 911 {
 912 #define LZWClr  256UL  /* Clear Table Marker */
 913 #define LZWEod  257UL  /* End of Data marker */
 914 #define OutputCode(code) \
 915 { \
 916     accumulator+=code << (32-code_width-number_bits); \
 917     number_bits+=code_width; \
 918     while (number_bits >= 8) \
 919     { \
 920         (void) WriteBlobByte(image,(unsigned char) (accumulator >> 24)); \
 921         accumulator=accumulator << 8; \
 922         number_bits-=8; \
 923     } \
 924 }
 925
 926   typedef struct _TableType
 927   {
 928     ssize_t
 929       prefix,
 930       suffix,
 931       next;
 932   } TableType;
 933
 934   register ssize_t
 935     i;
 936
 937   size_t
 938     accumulator,
 939     number_bits,
 940     code_width,
 941     last_code,
 942     next_index;
 943
 944   ssize_t
 945     index;
 946
 947   TableType
 948     *table;
 949
 950   /*
 951     Allocate string table.
 952   */
 953   assert(image != (Image *) NULL);
 954   assert(image->signature == MagickCoreSignature);
 955   if (image->debug != MagickFalse)
 956     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
 957   assert(pixels != (unsigned char *) NULL);
 958   assert(exception != (ExceptionInfo *) NULL);
 959   assert(exception->signature == MagickCoreSignature);
 960   table=(TableType *) AcquireQuantumMemory(1UL << 12,sizeof(*table));
 961   if (table == (TableType *) NULL)
 962     return(MagickFalse);
 963   /*
 964     Initialize variables.
 965   */
 966   accumulator=0;
 967   code_width=9;
 968   number_bits=0;
 969   last_code=0;
 970   OutputCode(LZWClr);
 971   for (index=0; index < 256; index++)
 972   {
 973     table[index].prefix=(-1);
 974     table[index].suffix=(short) index;
 975     table[index].next=(-1);
 976   }
 977   next_index=LZWEod+1;
 978   code_width=9;
 979   last_code=(size_t) pixels[0];
 980   for (i=1; i < (ssize_t) length; i++)
 981   {
 982     /*
 983       Find string.
 984     */
 985     index=(ssize_t) last_code;
 986     while (index != -1)
 987       if ((table[index].prefix != (ssize_t) last_code) ||
 988           (table[index].suffix != (ssize_t) pixels[i]))
 989         index=table[index].next;
 990       else
 991         {
 992           last_code=(size_t) index;
 993           break;
 994         }
 995     if (last_code != (size_t) index)
 996       {
 997         /*
 998           Add string.
 999         */
1000         OutputCode(last_code);
1001         table[next_index].prefix=(ssize_t) last_code;
1002         table[next_index].suffix=(short) pixels[i];
1003         table[next_index].next=table[last_code].next;
1004         table[last_code].next=(ssize_t) next_index;
1005         next_index++;
1006         /*
1007           Did we just move up to next bit width?
1008         */
1009         if ((next_index >> code_width) != 0)
1010           {
1011             code_width++;
1012             if (code_width > 12)
1013               {
1014                 /*
1015                   Did we overflow the max bit width?
1016                 */
1017                 code_width--;
1018                 OutputCode(LZWClr);
1019                 for (index=0; index < 256; index++)
1020                 {
1021                   table[index].prefix=(-1);
1022                   table[index].suffix=index;
1023                   table[index].next=(-1);
1024                 }
1025                 next_index=LZWEod+1;
1026                 code_width=9;
1027               }
1028             }
1029           last_code=(size_t) pixels[i];
1030       }
1031   }
1032   /*
1033     Flush tables.
1034   */
1035   OutputCode(last_code);
1036   OutputCode(LZWEod);
1037   if (number_bits != 0)
1038     (void) WriteBlobByte(image,(unsigned char) (accumulator >> 24));
1039   table=(TableType *) RelinquishMagickMemory(table);
1040   return(MagickTrue);
1041 }
1042 \f
1043 /*
1044 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1045 %                                                                             %
1046 %                                                                             %
1047 %                                                                             %
1048 %   P a c k b i t s E n c o d e I m a g e                                     %
1049 %                                                                             %
1050 %                                                                             %
1051 %                                                                             %
1052 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1053 %
1054 %  PackbitsEncodeImage() compresses an image via Macintosh Packbits encoding
1055 %  specific to Postscript Level II or Portable Document Format.  To ensure
1056 %  portability, the binary Packbits bytes are encoded as ASCII Base-85.
1057 %
1058 %  The format of the PackbitsEncodeImage method is:
1059 %
1060 %      MagickBooleanType PackbitsEncodeImage(Image *image,const size_t length,
1061 %        unsigned char *restrict pixels)
1062 %
1063 %  A description of each parameter follows:
1064 %
1065 %    o image: the image.
1066 %
1067 %    o length:  A value that specifies the number of pixels to compress.
1068 %
1069 %    o pixels: the address of an unsigned array of characters containing the
1070 %      pixels to compress.
1071 %
1072 */
1073 MagickExport MagickBooleanType PackbitsEncodeImage(Image *image,
1074   const size_t length,unsigned char *restrict pixels,ExceptionInfo *exception)
1075 {
1076   int
1077     count;
1078
1079   register ssize_t
1080     i,
1081     j;
1082
1083   unsigned char
1084     *packbits;
1085
1086   /*
1087     Compress pixels with Packbits encoding.
1088   */
1089   assert(image != (Image *) NULL);
1090   assert(image->signature == MagickCoreSignature);
1091   if (image->debug != MagickFalse)
1092     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1093   assert(pixels != (unsigned char *) NULL);
1094   packbits=(unsigned char *) AcquireQuantumMemory(128UL,sizeof(*packbits));
1095   if (packbits == (unsigned char *) NULL)
1096     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1097       image->filename);
1098   for (i=(ssize_t) length; i != 0; )
1099   {
1100     switch (i)
1101     {
1102       case 1:
1103       {
1104         i--;
1105         (void) WriteBlobByte(image,(unsigned char) 0);
1106         (void) WriteBlobByte(image,*pixels);
1107         break;
1108       }
1109       case 2:
1110       {
1111         i-=2;
1112         (void) WriteBlobByte(image,(unsigned char) 1);
1113         (void) WriteBlobByte(image,*pixels);
1114         (void) WriteBlobByte(image,pixels[1]);
1115         break;
1116       }
1117       case 3:
1118       {
1119         i-=3;
1120         if ((*pixels == *(pixels+1)) && (*(pixels+1) == *(pixels+2)))
1121           {
1122             (void) WriteBlobByte(image,(unsigned char) ((256-3)+1));
1123             (void) WriteBlobByte(image,*pixels);
1124             break;
1125           }
1126         (void) WriteBlobByte(image,(unsigned char) 2);
1127         (void) WriteBlobByte(image,*pixels);
1128         (void) WriteBlobByte(image,pixels[1]);
1129         (void) WriteBlobByte(image,pixels[2]);
1130         break;
1131       }
1132       default:
1133       {
1134         if ((*pixels == *(pixels+1)) && (*(pixels+1) == *(pixels+2)))
1135           {
1136             /*
1137               Packed run.
1138             */
1139             count=3;
1140             while (((ssize_t) count < i) && (*pixels == *(pixels+count)))
1141             {
1142               count++;
1143               if (count >= 127)
1144                 break;
1145             }
1146             i-=count;
1147             (void) WriteBlobByte(image,(unsigned char) ((256-count)+1));
1148             (void) WriteBlobByte(image,*pixels);
1149             pixels+=count;
1150             break;
1151           }
1152         /*
1153           Literal run.
1154         */
1155         count=0;
1156         while ((*(pixels+count) != *(pixels+count+1)) ||
1157                (*(pixels+count+1) != *(pixels+count+2)))
1158         {
1159           packbits[count+1]=pixels[count];
1160           count++;
1161           if (((ssize_t) count >= (i-3)) || (count >= 127))
1162             break;
1163         }
1164         i-=count;
1165         *packbits=(unsigned char) (count-1);
1166         for (j=0; j <= (ssize_t) count; j++)
1167           (void) WriteBlobByte(image,packbits[j]);
1168         pixels+=count;
1169         break;
1170       }
1171     }
1172   }
1173   (void) WriteBlobByte(image,(unsigned char) 128);  /* EOD marker */
1174   packbits=(unsigned char *) RelinquishMagickMemory(packbits);
1175   return(MagickTrue);
1176 }
1177 \f
1178 #if defined(MAGICKCORE_ZLIB_DELEGATE)
1179 /*
1180 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1181 %                                                                             %
1182 %                                                                             %
1183 %                                                                             %
1184 %   Z L I B E n c o d e I m a g e                                             %
1185 %                                                                             %
1186 %                                                                             %
1187 %                                                                             %
1188 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
1189 %
1190 %  ZLIBEncodeImage compresses an image via ZLIB-coding specific to
1191 %  Postscript Level II or Portable Document Format.
1192 %
1193 %  The format of the ZLIBEncodeImage method is:
1194 %
1195 %      MagickBooleanType ZLIBEncodeImage(Image *image,const size_t length,
1196 %        unsigned char *restrict pixels,ExceptionInfo *exception)
1197 %
1198 %  A description of each parameter follows:
1199 %
1200 %    o file: the address of a structure of type FILE.  ZLIB encoded pixels
1201 %      are written to this file.
1202 %
1203 %    o length:  A value that specifies the number of pixels to compress.
1204 %
1205 %    o pixels: the address of an unsigned array of characters containing the
1206 %      pixels to compress.
1207 %
1208 %    o exception: return any errors or warnings in this structure.
1209 %
1210 */
1211
1212 static voidpf AcquireZIPMemory(voidpf context,unsigned int items,
1213   unsigned int size)
1214 {
1215   (void) context;
1216   return((voidpf) AcquireQuantumMemory(items,size));
1217 }
1218
1219 static void RelinquishZIPMemory(voidpf context,voidpf memory)
1220 {
1221   (void) context;
1222   memory=RelinquishMagickMemory(memory);
1223 }
1224
1225 MagickExport MagickBooleanType ZLIBEncodeImage(Image *image,const size_t length,
1226   unsigned char *restrict pixels,ExceptionInfo *exception)
1227 {
1228   int
1229     status;
1230
1231   register ssize_t
1232     i;
1233
1234   size_t
1235     compress_packets;
1236
1237   unsigned char
1238     *compress_pixels;
1239
1240   z_stream
1241     stream;
1242
1243   assert(image != (Image *) NULL);
1244   assert(image->signature == MagickCoreSignature);
1245   if (image->debug != MagickFalse)
1246     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1247   compress_packets=(size_t) (1.001*length+12);
1248   compress_pixels=(unsigned char *) AcquireQuantumMemory(compress_packets,
1249     sizeof(*compress_pixels));
1250   if (compress_pixels == (unsigned char *) NULL)
1251     ThrowBinaryException(ResourceLimitError,"MemoryAllocationFailed",
1252       image->filename);
1253   stream.next_in=pixels;
1254   stream.avail_in=(unsigned int) length;
1255   stream.next_out=compress_pixels;
1256   stream.avail_out=(unsigned int) compress_packets;
1257   stream.zalloc=AcquireZIPMemory;
1258   stream.zfree=RelinquishZIPMemory;
1259   stream.opaque=(voidpf) NULL;
1260   status=deflateInit(&stream,(int) (image->quality ==
1261     UndefinedCompressionQuality ? 7 : MagickMin(image->quality/10,9)));
1262   if (status == Z_OK)
1263     {
1264       status=deflate(&stream,Z_FINISH);
1265       if (status == Z_STREAM_END)
1266         status=deflateEnd(&stream);
1267       else
1268         (void) deflateEnd(&stream);
1269       compress_packets=(size_t) stream.total_out;
1270     }
1271   if (status != Z_OK)
1272     ThrowBinaryException(CoderError,"UnableToZipCompressImage",image->filename)
1273   for (i=0; i < (ssize_t) compress_packets; i++)
1274     (void) WriteBlobByte(image,compress_pixels[i]);
1275   compress_pixels=(unsigned char *) RelinquishMagickMemory(compress_pixels);
1276   return(MagickTrue);
1277 }
1278 #else
1279 MagickExport MagickBooleanType ZLIBEncodeImage(Image *image,
1280   const size_t magick_unused(length),unsigned char *magick_unused(pixels),
1281   ExceptionInfo *exception)
1282 {
1283   assert(image != (Image *) NULL);
1284   assert(image->signature == MagickCoreSignature);
1285   if (image->debug != MagickFalse)
1286     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
1287   (void) ThrowMagickException(exception,GetMagickModule(),MissingDelegateError,
1288     "DelegateLibrarySupportNotBuiltIn","'%s' (ZIP)",image->filename);
1289   return(MagickFalse);
1290 }
1291 #endif