src/tiff/tif_dumpmode.c

   1 /* $Header$ */
   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 #include <assert.h>
  34
  35 /*
  36  * Encode a hunk of pixels.
  37  */
  38 static int
  39 DumpModeEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
  40 {
  41         (void) s;
  42         while (cc > 0) {
  43                 tsize_t n;
  44
  45                 n = cc;
  46                 if (tif->tif_rawcc + n > tif->tif_rawdatasize)
  47                         n = tif->tif_rawdatasize - tif->tif_rawcc;
  48
  49                 assert( n > 0 );
  50
  51                 /*
  52                  * Avoid copy if client has setup raw
  53                  * data buffer to avoid extra copy.
  54                  */
  55                 if (tif->tif_rawcp != pp)
  56                         _TIFFmemcpy(tif->tif_rawcp, pp, n);
  57                 tif->tif_rawcp += n;
  58                 tif->tif_rawcc += n;
  59                 pp += n;
  60                 cc -= n;
  61                 if (tif->tif_rawcc >= tif->tif_rawdatasize &&
  62                     !TIFFFlushData1(tif))
  63                         return (-1);
  64         }
  65         return (1);
  66 }
  67
  68 /*
  69  * Decode a hunk of pixels.
  70  */
  71 static int
  72 DumpModeDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
  73 {
  74         (void) s;
  75         if (tif->tif_rawcc < cc) {
  76                 TIFFError(tif->tif_name,
  77                     "DumpModeDecode: Not enough data for scanline %d",
  78                     tif->tif_row);
  79                 return (0);
  80         }
  81         /*
  82          * Avoid copy if client has setup raw
  83          * data buffer to avoid extra copy.
  84          */
  85         if (tif->tif_rawcp != buf)
  86                 _TIFFmemcpy(buf, tif->tif_rawcp, cc);
  87         tif->tif_rawcp += cc;
  88         tif->tif_rawcc -= cc;
  89         return (1);
  90 }
  91
  92 /*
  93  * Seek forwards nrows in the current strip.
  94  */
  95 static int
  96 DumpModeSeek(TIFF* tif, uint32 nrows)
  97 {
  98         tif->tif_rawcp += nrows * tif->tif_scanlinesize;
  99         tif->tif_rawcc -= nrows * tif->tif_scanlinesize;
 100         return (1);
 101 }
 102
 103 /*
 104  * Initialize dump mode.
 105  */
 106 int
 107 TIFFInitDumpMode(TIFF* tif, int scheme)
 108 {
 109         (void) scheme;
 110         tif->tif_decoderow = DumpModeDecode;
 111         tif->tif_decodestrip = DumpModeDecode;
 112         tif->tif_decodetile = DumpModeDecode;
 113         tif->tif_encoderow = DumpModeEncode;
 114         tif->tif_encodestrip = DumpModeEncode;
 115         tif->tif_encodetile = DumpModeEncode;
 116         tif->tif_seek = DumpModeSeek;
 117         return (1);
 118 }