dll/3rdparty/libtiff/tif_compress.c

   1 /* $Id: tif_compress.c,v 1.13.2.1 2010-06-08 18:50:41 bfriesen Exp $ */
   2
   3 /*
   4  * Copyright (c) 1988-1997 Sam Leffler
   5  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and
   8  * its documentation for any purpose is hereby granted without fee, provided
   9  * that (i) the above copyright notices and this permission notice appear in
  10  * all copies of the software and related documentation, and (ii) the names of
  11  * Sam Leffler and Silicon Graphics may not be used in any advertising or
  12  * publicity relating to the software without the specific, prior written
  13  * permission of Sam Leffler and Silicon Graphics.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  17  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
  20  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  21  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  22  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  23  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  */
  26
  27 /*
  28  * TIFF Library
  29  *
  30  * Compression Scheme Configuration Support.
  31  */
  32 #include "tiffiop.h"
  33
  34 static int
  35 TIFFNoEncode(TIFF* tif, const char* method)
  36 {
  37         const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
  38
  39         if (c) {
  40                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  41                              "%s %s encoding is not implemented",
  42                              c->name, method);
  43         } else {
  44                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  45                         "Compression scheme %u %s encoding is not implemented",
  46                              tif->tif_dir.td_compression, method);
  47         }
  48         return (-1);
  49 }
  50
  51 int
  52 _TIFFNoRowEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
  53 {
  54         (void) pp; (void) cc; (void) s;
  55         return (TIFFNoEncode(tif, "scanline"));
  56 }
  57
  58 int
  59 _TIFFNoStripEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
  60 {
  61         (void) pp; (void) cc; (void) s;
  62         return (TIFFNoEncode(tif, "strip"));
  63 }
  64
  65 int
  66 _TIFFNoTileEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
  67 {
  68         (void) pp; (void) cc; (void) s;
  69         return (TIFFNoEncode(tif, "tile"));
  70 }
  71
  72 static int
  73 TIFFNoDecode(TIFF* tif, const char* method)
  74 {
  75         const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
  76
  77         if (c)
  78                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  79                              "%s %s decoding is not implemented",
  80                              c->name, method);
  81         else
  82                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  83                              "Compression scheme %u %s decoding is not implemented",
  84                              tif->tif_dir.td_compression, method);
  85         return (-1);
  86 }
  87
  88 int
  89 _TIFFNoRowDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
  90 {
  91         (void) pp; (void) cc; (void) s;
  92         return (TIFFNoDecode(tif, "scanline"));
  93 }
  94
  95 int
  96 _TIFFNoStripDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
  97 {
  98         (void) pp; (void) cc; (void) s;
  99         return (TIFFNoDecode(tif, "strip"));
 100 }
 101
 102 int
 103 _TIFFNoTileDecode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
 104 {
 105         (void) pp; (void) cc; (void) s;
 106         return (TIFFNoDecode(tif, "tile"));
 107 }
 108
 109 int
 110 _TIFFNoSeek(TIFF* tif, uint32 off)
 111 {
 112         (void) off;
 113         TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
 114                      "Compression algorithm does not support random access");
 115         return (0);
 116 }
 117
 118 int
 119 _TIFFNoPreCode(TIFF* tif, tsample_t s)
 120 {
 121         (void) tif; (void) s;
 122         return (1);
 123 }
 124
 125 static int _TIFFtrue(TIFF* tif) { (void) tif; return (1); }
 126 static void _TIFFvoid(TIFF* tif) { (void) tif; }
 127
 128 void
 129 _TIFFSetDefaultCompressionState(TIFF* tif)
 130 {
 131         tif->tif_decodestatus = TRUE;
 132         tif->tif_setupdecode = _TIFFtrue;
 133         tif->tif_predecode = _TIFFNoPreCode;
 134         tif->tif_decoderow = _TIFFNoRowDecode;
 135         tif->tif_decodestrip = _TIFFNoStripDecode;
 136         tif->tif_decodetile = _TIFFNoTileDecode;
 137         tif->tif_encodestatus = TRUE;
 138         tif->tif_setupencode = _TIFFtrue;
 139         tif->tif_preencode = _TIFFNoPreCode;
 140         tif->tif_postencode = _TIFFtrue;
 141         tif->tif_encoderow = _TIFFNoRowEncode;
 142         tif->tif_encodestrip = _TIFFNoStripEncode;
 143         tif->tif_encodetile = _TIFFNoTileEncode;
 144         tif->tif_close = _TIFFvoid;
 145         tif->tif_seek = _TIFFNoSeek;
 146         tif->tif_cleanup = _TIFFvoid;
 147         tif->tif_defstripsize = _TIFFDefaultStripSize;
 148         tif->tif_deftilesize = _TIFFDefaultTileSize;
 149         tif->tif_flags &= ~(TIFF_NOBITREV|TIFF_NOREADRAW);
 150 }
 151
 152 int
 153 TIFFSetCompressionScheme(TIFF* tif, int scheme)
 154 {
 155         const TIFFCodec *c = TIFFFindCODEC((uint16) scheme);
 156
 157         _TIFFSetDefaultCompressionState(tif);
 158         /*
 159          * Don't treat an unknown compression scheme as an error.
 160          * This permits applications to open files with data that
 161          * the library does not have builtin support for, but which
 162          * may still be meaningful.
 163          */
 164         return (c ? (*c->init)(tif, scheme) : 1);
 165 }
 166
 167 /*
 168  * Other compression schemes may be registered.  Registered
 169  * schemes can also override the builtin versions provided
 170  * by this library.
 171  */
 172 typedef struct _codec {
 173         struct _codec*  next;
 174         TIFFCodec*      info;
 175 } codec_t;
 176 static  codec_t* registeredCODECS = NULL;
 177
 178 const TIFFCodec*
 179 TIFFFindCODEC(uint16 scheme)
 180 {
 181         const TIFFCodec* c;
 182         codec_t* cd;
 183
 184         for (cd = registeredCODECS; cd; cd = cd->next)
 185                 if (cd->info->scheme == scheme)
 186                         return ((const TIFFCodec*) cd->info);
 187         for (c = _TIFFBuiltinCODECS; c->name; c++)
 188                 if (c->scheme == scheme)
 189                         return (c);
 190         return ((const TIFFCodec*) 0);
 191 }
 192
 193 TIFFCodec*
 194 TIFFRegisterCODEC(uint16 scheme, const char* name, TIFFInitMethod init)
 195 {
 196         codec_t* cd = (codec_t*)
 197             _TIFFmalloc(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1);
 198
 199         if (cd != NULL) {
 200                 cd->info = (TIFFCodec*) ((tidata_t) cd + sizeof (codec_t));
 201                 cd->info->name = (char*)
 202                     ((tidata_t) cd->info + sizeof (TIFFCodec));
 203                 strcpy(cd->info->name, name);
 204                 cd->info->scheme = scheme;
 205                 cd->info->init = init;
 206                 cd->next = registeredCODECS;
 207                 registeredCODECS = cd;
 208         } else {
 209                 TIFFErrorExt(0, "TIFFRegisterCODEC",
 210                     "No space to register compression scheme %s", name);
 211                 return NULL;
 212         }
 213         return (cd->info);
 214 }
 215
 216 void
 217 TIFFUnRegisterCODEC(TIFFCodec* c)
 218 {
 219         codec_t* cd;
 220         codec_t** pcd;
 221
 222         for (pcd = &registeredCODECS; (cd = *pcd); pcd = &cd->next)
 223                 if (cd->info == c) {
 224                         *pcd = cd->next;
 225                         _TIFFfree(cd);
 226                         return;
 227                 }
 228         TIFFErrorExt(0, "TIFFUnRegisterCODEC",
 229             "Cannot remove compression scheme %s; not registered", c->name);
 230 }
 231
 232 /************************************************************************/
 233 /*                       TIFFGetConfisuredCODECs()                      */
 234 /************************************************************************/
 235
 236 /**
 237  * Get list of configured codecs, both built-in and registered by user.
 238  * Caller is responsible to free this structure.
 239  *
 240  * @return returns array of TIFFCodec records (the last record should be NULL)
 241  * or NULL if function failed.
 242  */
 243
 244 TIFFCodec*
 245 TIFFGetConfiguredCODECs()
 246 {
 247         int             i = 1;
 248         codec_t         *cd;
 249         const TIFFCodec *c;
 250         TIFFCodec       *codecs = NULL, *new_codecs;
 251
 252         for (cd = registeredCODECS; cd; cd = cd->next) {
 253                 new_codecs = (TIFFCodec *)
 254                         _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
 255                 if (!new_codecs) {
 256                         _TIFFfree (codecs);
 257                         return NULL;
 258                 }
 259                 codecs = new_codecs;
 260                 _TIFFmemcpy(codecs + i - 1, cd, sizeof(TIFFCodec));
 261                 i++;
 262         }
 263         for (c = _TIFFBuiltinCODECS; c->name; c++) {
 264                 if (TIFFIsCODECConfigured(c->scheme)) {
 265                         new_codecs = (TIFFCodec *)
 266                                 _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
 267                         if (!new_codecs) {
 268                                 _TIFFfree (codecs);
 269                                 return NULL;
 270                         }
 271                         codecs = new_codecs;
 272                         _TIFFmemcpy(codecs + i - 1, (const tdata_t)c, sizeof(TIFFCodec));
 273                         i++;
 274                 }
 275         }
 276
 277         new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
 278         if (!new_codecs) {
 279                 _TIFFfree (codecs);
 280                 return NULL;
 281         }
 282         codecs = new_codecs;
 283         _TIFFmemset(codecs + i - 1, 0, sizeof(TIFFCodec));
 284
 285         return codecs;
 286 }
 287
 288 /* vim: set ts=8 sts=8 sw=8 noet: */
 289 /*
 290  * Local Variables:
 291  * mode: c
 292  * c-basic-offset: 8
 293  * fill-column: 78
 294  * End:
 295  */