| 1 | /* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_dumpmode.c,v 1.4 2005/12/21 12:23:13 joris Exp $ */
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| 2 |
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| 3 | /*
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| 4 | * Copyright (c) 1988-1997 Sam Leffler
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| 5 | * Copyright (c) 1991-1997 Silicon Graphics, Inc.
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| 6 | *
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| 7 | * Permission to use, copy, modify, distribute, and sell this software and
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| 8 | * its documentation for any purpose is hereby granted without fee, provided
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| 9 | * that (i) the above copyright notices and this permission notice appear in
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| 10 | * all copies of the software and related documentation, and (ii) the names of
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| 11 | * Sam Leffler and Silicon Graphics may not be used in any advertising or
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| 12 | * publicity relating to the software without the specific, prior written
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| 13 | * permission of Sam Leffler and Silicon Graphics.
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| 14 | *
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| 15 | * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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| 16 | * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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| 17 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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| 18 | *
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| 19 | * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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| 20 | * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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| 21 | * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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| 22 | * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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| 23 | * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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| 24 | * OF THIS SOFTWARE.
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| 25 | */
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| 26 |
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| 27 | /*
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| 28 | * TIFF Library.
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| 29 | *
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| 30 | * "Null" Compression Algorithm Support.
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| 31 | */
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| 32 | #include "tiffiop.h"
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| 33 |
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| 34 | /*
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| 35 | * Encode a hunk of pixels.
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| 36 | */
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| 37 | static int
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| 38 | DumpModeEncode(TIFF* tif, tidata_t pp, tsize_t cc, tsample_t s)
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| 39 | {
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| 40 | (void) s;
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| 41 | while (cc > 0) {
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| 42 | tsize_t n;
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| 43 |
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| 44 | n = cc;
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| 45 | if (tif->tif_rawcc + n > tif->tif_rawdatasize)
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| 46 | n = tif->tif_rawdatasize - tif->tif_rawcc;
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| 47 |
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| 48 | assert( n > 0 );
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| 49 |
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| 50 | /*
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| 51 | * Avoid copy if client has setup raw
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| 52 | * data buffer to avoid extra copy.
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| 53 | */
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| 54 | if (tif->tif_rawcp != pp)
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| 55 | _TIFFmemcpy(tif->tif_rawcp, pp, n);
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| 56 | tif->tif_rawcp += n;
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| 57 | tif->tif_rawcc += n;
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| 58 | pp += n;
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| 59 | cc -= n;
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| 60 | if (tif->tif_rawcc >= tif->tif_rawdatasize &&
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| 61 | !TIFFFlushData1(tif))
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| 62 | return (-1);
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| 63 | }
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| 64 | return (1);
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| 65 | }
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| 66 |
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| 67 | /*
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| 68 | * Decode a hunk of pixels.
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| 69 | */
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| 70 | static int
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| 71 | DumpModeDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
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| 72 | {
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| 73 | (void) s;
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| 74 | if (tif->tif_rawcc < cc) {
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| 75 | TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
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| 76 | "DumpModeDecode: Not enough data for scanline %d",
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| 77 | tif->tif_row);
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| 78 | return (0);
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| 79 | }
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| 80 | /*
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| 81 | * Avoid copy if client has setup raw
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| 82 | * data buffer to avoid extra copy.
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| 83 | */
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| 84 | if (tif->tif_rawcp != buf)
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| 85 | _TIFFmemcpy(buf, tif->tif_rawcp, cc);
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| 86 | tif->tif_rawcp += cc;
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| 87 | tif->tif_rawcc -= cc;
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| 88 | return (1);
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| 89 | }
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| 90 |
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| 91 | /*
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| 92 | * Seek forwards nrows in the current strip.
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| 93 | */
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| 94 | static int
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| 95 | DumpModeSeek(TIFF* tif, uint32 nrows)
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| 96 | {
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| 97 | tif->tif_rawcp += nrows * tif->tif_scanlinesize;
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| 98 | tif->tif_rawcc -= nrows * tif->tif_scanlinesize;
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| 99 | return (1);
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| 100 | }
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| 101 |
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| 102 | /*
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| 103 | * Initialize dump mode.
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| 104 | */
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| 105 | int
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| 106 | TIFFInitDumpMode(TIFF* tif, int scheme)
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| 107 | {
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| 108 | (void) scheme;
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| 109 | tif->tif_decoderow = DumpModeDecode;
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| 110 | tif->tif_decodestrip = DumpModeDecode;
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| 111 | tif->tif_decodetile = DumpModeDecode;
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| 112 | tif->tif_encoderow = DumpModeEncode;
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| 113 | tif->tif_encodestrip = DumpModeEncode;
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| 114 | tif->tif_encodetile = DumpModeEncode;
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| 115 | tif->tif_seek = DumpModeSeek;
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| 116 | return (1);
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| 117 | }
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