/src/freeimage-svn/FreeImage/trunk/Source/LibOpenJPEG/raw.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
3 | | * Copyright (c) 2002-2007, Professor Benoit Macq |
4 | | * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe |
5 | | * Copyright (c) 2005, Herve Drolon, FreeImage Team |
6 | | * All rights reserved. |
7 | | * |
8 | | * Redistribution and use in source and binary forms, with or without |
9 | | * modification, are permitted provided that the following conditions |
10 | | * are met: |
11 | | * 1. Redistributions of source code must retain the above copyright |
12 | | * notice, this list of conditions and the following disclaimer. |
13 | | * 2. Redistributions in binary form must reproduce the above copyright |
14 | | * notice, this list of conditions and the following disclaimer in the |
15 | | * documentation and/or other materials provided with the distribution. |
16 | | * |
17 | | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
18 | | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
19 | | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
20 | | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
21 | | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
22 | | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
23 | | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
24 | | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
25 | | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
26 | | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
27 | | * POSSIBILITY OF SUCH DAMAGE. |
28 | | */ |
29 | | |
30 | | #include "opj_includes.h" |
31 | | |
32 | | /* |
33 | | ========================================================== |
34 | | local functions |
35 | | ========================================================== |
36 | | */ |
37 | | |
38 | | |
39 | | /* |
40 | | ========================================================== |
41 | | RAW encoding interface |
42 | | ========================================================== |
43 | | */ |
44 | | |
45 | 0 | opj_raw_t* opj_raw_create(void) { |
46 | 0 | opj_raw_t *raw = (opj_raw_t*)opj_malloc(sizeof(opj_raw_t)); |
47 | 0 | return raw; |
48 | 0 | } |
49 | | |
50 | 0 | void opj_raw_destroy(opj_raw_t *raw) { |
51 | 0 | if(raw) { |
52 | 0 | opj_free(raw); |
53 | 0 | } |
54 | 0 | } |
55 | | |
56 | 0 | OPJ_UINT32 opj_raw_numbytes(opj_raw_t *raw) { |
57 | 0 | const ptrdiff_t diff = raw->bp - raw->start; |
58 | 0 | assert( diff <= (ptrdiff_t)0xffffffff && diff >= 0 ); /* UINT32_MAX */ |
59 | 0 | return (OPJ_UINT32)diff; |
60 | 0 | } |
61 | | |
62 | 0 | void opj_raw_init_dec(opj_raw_t *raw, OPJ_BYTE *bp, OPJ_UINT32 len) { |
63 | 0 | raw->start = bp; |
64 | 0 | raw->lenmax = len; |
65 | 0 | raw->len = 0; |
66 | 0 | raw->c = 0; |
67 | 0 | raw->ct = 0; |
68 | 0 | } |
69 | | |
70 | 0 | OPJ_UINT32 opj_raw_decode(opj_raw_t *raw) { |
71 | 0 | OPJ_UINT32 d; |
72 | 0 | if (raw->ct == 0) { |
73 | 0 | raw->ct = 8; |
74 | 0 | if (raw->len == raw->lenmax) { |
75 | 0 | raw->c = 0xff; |
76 | 0 | } else { |
77 | 0 | if (raw->c == 0xff) { |
78 | 0 | raw->ct = 7; |
79 | 0 | } |
80 | 0 | raw->c = *(raw->start + raw->len); |
81 | 0 | raw->len++; |
82 | 0 | } |
83 | 0 | } |
84 | 0 | raw->ct--; |
85 | 0 | d = (raw->c >> raw->ct) & 0x01; |
86 | | |
87 | 0 | return d; |
88 | 0 | } |
89 | | |