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