1/* $Header: /cvs/maptools/cvsroot/libtiff/libtiff/tif_dumpmode.c,v 1.5.2.2 2010-06-08 18:50:42 bfriesen 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 */
37static int
38DumpModeEncode(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 */
70static int
71DumpModeDecode(TIFF* tif, tidata_t buf, tsize_t cc, tsample_t s)
72{
73	(void) s;
74/*         fprintf(stderr,"DumpModeDecode: scanline %ld, expected %ld bytes, got %ld bytes\n", */
75/*                 (long) tif->tif_row, (long) tif->tif_rawcc, (long) cc); */
76	if (tif->tif_rawcc < cc) {
77		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
78		    "DumpModeDecode: Not enough data for scanline %d",
79		    tif->tif_row);
80		return (0);
81	}
82	/*
83	 * Avoid copy if client has setup raw
84	 * data buffer to avoid extra copy.
85	 */
86	if (tif->tif_rawcp != buf)
87		_TIFFmemcpy(buf, tif->tif_rawcp, cc);
88	tif->tif_rawcp += cc;
89	tif->tif_rawcc -= cc;
90	return (1);
91}
92
93/*
94 * Seek forwards nrows in the current strip.
95 */
96static int
97DumpModeSeek(TIFF* tif, uint32 nrows)
98{
99	tif->tif_rawcp += nrows * tif->tif_scanlinesize;
100	tif->tif_rawcc -= nrows * tif->tif_scanlinesize;
101	return (1);
102}
103
104/*
105 * Initialize dump mode.
106 */
107int
108TIFFInitDumpMode(TIFF* tif, int scheme)
109{
110	(void) scheme;
111	tif->tif_decoderow = DumpModeDecode;
112	tif->tif_decodestrip = DumpModeDecode;
113	tif->tif_decodetile = DumpModeDecode;
114	tif->tif_encoderow = DumpModeEncode;
115	tif->tif_encodestrip = DumpModeEncode;
116	tif->tif_encodetile = DumpModeEncode;
117	tif->tif_seek = DumpModeSeek;
118	return (1);
119}
120/*
121 * Local Variables:
122 * mode: c
123 * c-basic-offset: 8
124 * fill-column: 78
125 * End:
126 */
127