src/tiff/libtiff/tif_dumpmode.c

   1 /* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_dumpmode.c,v 1.4 2005/12/21 12:23:13 joris 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  * "Null" Compression Algorithm Support.
  31  */
  32 #include "tiffiop.h"
  33
  34 /*
  35  * Encode a hunk of pixels.
  36  */
  37 static int
  38 DumpModeEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
  39 {
  40         (void) s;
  41         while (cc > 0) {
  42                 tsize_t n;
  43
  44                 n = cc;
  45                 if (tif->tif_rawcc + n > tif->tif_rawdatasize)
  46                         n = tif->tif_rawdatasize - tif->tif_rawcc;
  47
  48                 assert( n > 0 );
  49
  50                 /*
  51                  * Avoid copy if client has setup raw
  52                  * data buffer to avoid extra copy.
  53                  */
  54                 if (tif->tif_rawcp != pp)
  55                         _TIFFmemcpy(tif->tif_rawcp, pp, n);
  56                 tif->tif_rawcp += n;
  57                 tif->tif_rawcc += n;
  58                 pp += n;
  59                 cc -= n;
  60                 if (tif->tif_rawcc >= tif->tif_rawdatasize &&
  61                     !TIFFFlushData1(tif))
  62                         return (-1);
  63         }
  64         return (1);
  65 }
  66
  67 /*
  68  * Decode a hunk of pixels.
  69  */
  70 static int
  71 DumpModeDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
  72 {
  73         (void) s;
  74         if (tif->tif_rawcc < cc) {
  75                 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
  76                     "DumpModeDecode: Not enough data for scanline %d",
  77                     tif->tif_row);
  78                 return (0);
  79         }
  80         /*
  81          * Avoid copy if client has setup raw
  82          * data buffer to avoid extra copy.
  83          */
  84         if (tif->tif_rawcp != buf)
  85                 _TIFFmemcpy(buf, tif->tif_rawcp, cc);
  86         tif->tif_rawcp += cc;
  87         tif->tif_rawcc -= cc;
  88         return (1);
  89 }
  90
  91 /*
  92  * Seek forwards nrows in the current strip.
  93  */
  94 static int
  95 DumpModeSeek(TIFF* tif, uint32 nrows)
  96 {
  97         tif->tif_rawcp += nrows * tif->tif_scanlinesize;
  98         tif->tif_rawcc -= nrows * tif->tif_scanlinesize;
  99         return (1);
 100 }
 101
 102 /*
 103  * Initialize dump mode.
 104  */
 105 int
 106 TIFFInitDumpMode(TIFF* tif, int scheme)
 107 {
 108         (void) scheme;
 109         tif->tif_decoderow = DumpModeDecode;
 110         tif->tif_decodestrip = DumpModeDecode;
 111         tif->tif_decodetile = DumpModeDecode;
 112         tif->tif_encoderow = DumpModeEncode;
 113         tif->tif_encodestrip = DumpModeEncode;
 114         tif->tif_encodetile = DumpModeEncode;
 115         tif->tif_seek = DumpModeSeek;
 116         return (1);
 117 }