src/tiff/libtiff/tif_compress.c

   1
   2 /*
   3  * Copyright (c) 1988-1997 Sam Leffler
   4  * Copyright (c) 1991-1997 Silicon Graphics, Inc.
   5  *
   6  * Permission to use, copy, modify, distribute, and sell this software and
   7  * its documentation for any purpose is hereby granted without fee, provided
   8  * that (i) the above copyright notices and this permission notice appear in
   9  * all copies of the software and related documentation, and (ii) the names of
  10  * Sam Leffler and Silicon Graphics may not be used in any advertising or
  11  * publicity relating to the software without the specific, prior written
  12  * permission of Sam Leffler and Silicon Graphics.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  15  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  16  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  17  *
  18  * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
  19  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  20  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  21  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  22  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  23  * OF THIS SOFTWARE.
  24  */
  25
  26 /*
  27  * TIFF Library
  28  *
  29  * Compression Scheme Configuration Support.
  30  */
  31 #include "tiffiop.h"
  32
  33 static int
  34 TIFFNoEncode(TIFF* tif, const char* method)
  35 {
  36         const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
  37
  38         if (c) {
  39                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  40                              "%s %s encoding is not implemented",
  41                              c->name, method);
  42         } else {
  43                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  44                         "Compression scheme %u %s encoding is not implemented",
  45                              tif->tif_dir.td_compression, method);
  46         }
  47         return (-1);
  48 }
  49
  50 int
  51 _TIFFNoRowEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
  52 {
  53         (void) pp; (void) cc; (void) s;
  54         return (TIFFNoEncode(tif, "scanline"));
  55 }
  56
  57 int
  58 _TIFFNoStripEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
  59 {
  60         (void) pp; (void) cc; (void) s;
  61         return (TIFFNoEncode(tif, "strip"));
  62 }
  63
  64 int
  65 _TIFFNoTileEncode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
  66 {
  67         (void) pp; (void) cc; (void) s;
  68         return (TIFFNoEncode(tif, "tile"));
  69 }
  70
  71 static int
  72 TIFFNoDecode(TIFF* tif, const char* method)
  73 {
  74         const TIFFCodec* c = TIFFFindCODEC(tif->tif_dir.td_compression);
  75
  76         if (c)
  77                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  78                              "%s %s decoding is not implemented",
  79                              c->name, method);
  80         else
  81                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  82                              "Compression scheme %u %s decoding is not implemented",
  83                              tif->tif_dir.td_compression, method);
  84         return (-1);
  85 }
  86
  87 int
  88 _TIFFNoFixupTags(TIFF* tif)
  89 {
  90         (void) tif;
  91         return (1);
  92 }
  93
  94 int
  95 _TIFFNoRowDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
  96 {
  97         (void) pp; (void) cc; (void) s;
  98         return (TIFFNoDecode(tif, "scanline"));
  99 }
 100
 101 int
 102 _TIFFNoStripDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
 103 {
 104         (void) pp; (void) cc; (void) s;
 105         return (TIFFNoDecode(tif, "strip"));
 106 }
 107
 108 int
 109 _TIFFNoTileDecode(TIFF* tif, uint8* pp, tmsize_t cc, uint16 s)
 110 {
 111         (void) pp; (void) cc; (void) s;
 112         return (TIFFNoDecode(tif, "tile"));
 113 }
 114
 115 int
 116 _TIFFNoSeek(TIFF* tif, uint32 off)
 117 {
 118         (void) off;
 119         TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
 120                      "Compression algorithm does not support random access");
 121         return (0);
 122 }
 123
 124 int
 125 _TIFFNoPreCode(TIFF* tif, uint16 s)
 126 {
 127         (void) tif; (void) s;
 128         return (1);
 129 }
 130
 131 static int _TIFFtrue(TIFF* tif) { (void) tif; return (1); }
 132 static void _TIFFvoid(TIFF* tif) { (void) tif; }
 133
 134 void
 135 _TIFFSetDefaultCompressionState(TIFF* tif)
 136 {
 137         tif->tif_fixuptags = _TIFFNoFixupTags;
 138         tif->tif_decodestatus = TRUE;
 139         tif->tif_setupdecode = _TIFFtrue;
 140         tif->tif_predecode = _TIFFNoPreCode;
 141         tif->tif_decoderow = _TIFFNoRowDecode;
 142         tif->tif_decodestrip = _TIFFNoStripDecode;
 143         tif->tif_decodetile = _TIFFNoTileDecode;
 144         tif->tif_encodestatus = TRUE;
 145         tif->tif_setupencode = _TIFFtrue;
 146         tif->tif_preencode = _TIFFNoPreCode;
 147         tif->tif_postencode = _TIFFtrue;
 148         tif->tif_encoderow = _TIFFNoRowEncode;
 149         tif->tif_encodestrip = _TIFFNoStripEncode;
 150         tif->tif_encodetile = _TIFFNoTileEncode;
 151         tif->tif_close = _TIFFvoid;
 152         tif->tif_seek = _TIFFNoSeek;
 153         tif->tif_cleanup = _TIFFvoid;
 154         tif->tif_defstripsize = _TIFFDefaultStripSize;
 155         tif->tif_deftilesize = _TIFFDefaultTileSize;
 156         tif->tif_flags &= ~(TIFF_NOBITREV|TIFF_NOREADRAW);
 157 }
 158
 159 int
 160 TIFFSetCompressionScheme(TIFF* tif, int scheme)
 161 {
 162         const TIFFCodec *c = TIFFFindCODEC((uint16) scheme);
 163
 164         _TIFFSetDefaultCompressionState(tif);
 165         /*
 166          * Don't treat an unknown compression scheme as an error.
 167          * This permits applications to open files with data that
 168          * the library does not have builtin support for, but which
 169          * may still be meaningful.
 170          */
 171         return (c ? (*c->init)(tif, scheme) : 1);
 172 }
 173
 174 /*
 175  * Other compression schemes may be registered.  Registered
 176  * schemes can also override the builtin versions provided
 177  * by this library.
 178  */
 179 typedef struct _codec {
 180         struct _codec* next;
 181         TIFFCodec* info;
 182 } codec_t;
 183 static codec_t* registeredCODECS = NULL;
 184
 185 const TIFFCodec*
 186 TIFFFindCODEC(uint16 scheme)
 187 {
 188         const TIFFCodec* c;
 189         codec_t* cd;
 190
 191         for (cd = registeredCODECS; cd; cd = cd->next)
 192                 if (cd->info->scheme == scheme)
 193                         return ((const TIFFCodec*) cd->info);
 194         for (c = _TIFFBuiltinCODECS; c->name; c++)
 195                 if (c->scheme == scheme)
 196                         return (c);
 197         return ((const TIFFCodec*) 0);
 198 }
 199
 200 TIFFCodec*
 201 TIFFRegisterCODEC(uint16 scheme, const char* name, TIFFInitMethod init)
 202 {
 203         codec_t* cd = (codec_t*)
 204             _TIFFmalloc((tmsize_t)(sizeof (codec_t) + sizeof (TIFFCodec) + strlen(name)+1));
 205
 206         if (cd != NULL) {
 207                 cd->info = (TIFFCodec*) ((uint8*) cd + sizeof (codec_t));
 208                 cd->info->name = (char*)
 209                     ((uint8*) cd->info + sizeof (TIFFCodec));
 210                 strcpy(cd->info->name, name);
 211                 cd->info->scheme = scheme;
 212                 cd->info->init = init;
 213                 cd->next = registeredCODECS;
 214                 registeredCODECS = cd;
 215         } else {
 216                 TIFFErrorExt(0, "TIFFRegisterCODEC",
 217                     "No space to register compression scheme %s", name);
 218                 return NULL;
 219         }
 220         return (cd->info);
 221 }
 222
 223 void
 224 TIFFUnRegisterCODEC(TIFFCodec* c)
 225 {
 226         codec_t* cd;
 227         codec_t** pcd;
 228
 229         for (pcd = &registeredCODECS; (cd = *pcd); pcd = &cd->next)
 230                 if (cd->info == c) {
 231                         *pcd = cd->next;
 232                         _TIFFfree(cd);
 233                         return;
 234                 }
 235         TIFFErrorExt(0, "TIFFUnRegisterCODEC",
 236             "Cannot remove compression scheme %s; not registered", c->name);
 237 }
 238
 239 /************************************************************************/
 240 /*                       TIFFGetConfisuredCODECs()                      */
 241 /************************************************************************/
 242
 243 /**
 244  * Get list of configured codecs, both built-in and registered by user.
 245  * Caller is responsible to free this structure.
 246  *
 247  * @return returns array of TIFFCodec records (the last record should be NULL)
 248  * or NULL if function failed.
 249  */
 250
 251 TIFFCodec*
 252 TIFFGetConfiguredCODECs()
 253 {
 254         int i = 1;
 255         codec_t *cd;
 256         const TIFFCodec* c;
 257         TIFFCodec* codecs = NULL;
 258         TIFFCodec* new_codecs;
 259
 260         for (cd = registeredCODECS; cd; cd = cd->next) {
 261                 new_codecs = (TIFFCodec *)
 262                         _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
 263                 if (!new_codecs) {
 264                         _TIFFfree (codecs);
 265                         return NULL;
 266                 }
 267                 codecs = new_codecs;
 268                 _TIFFmemcpy(codecs + i - 1, cd, sizeof(TIFFCodec));
 269                 i++;
 270         }
 271         for (c = _TIFFBuiltinCODECS; c->name; c++) {
 272                 if (TIFFIsCODECConfigured(c->scheme)) {
 273                         new_codecs = (TIFFCodec *)
 274                                 _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
 275                         if (!new_codecs) {
 276                                 _TIFFfree (codecs);
 277                                 return NULL;
 278                         }
 279                         codecs = new_codecs;
 280                         _TIFFmemcpy(codecs + i - 1, (const void*)c, sizeof(TIFFCodec));
 281                         i++;
 282                 }
 283         }
 284
 285         new_codecs = (TIFFCodec *) _TIFFrealloc(codecs, i * sizeof(TIFFCodec));
 286         if (!new_codecs) {
 287                 _TIFFfree (codecs);
 288                 return NULL;
 289         }
 290         codecs = new_codecs;
 291         _TIFFmemset(codecs + i - 1, 0, sizeof(TIFFCodec));
 292
 293         return codecs;
 294 }
 295
 296 /* vim: set ts=8 sts=8 sw=8 noet: */
 297 /*
 298  * Local Variables:
 299  * mode: c
 300  * c-basic-offset: 8
 301  * fill-column: 78
 302  * End:
 303  */