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| 4758 | right-hear | 1 | /* |
| 2 | * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
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| 3 | * Copyright (c) 2002-2007, Professor Benoit Macq |
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| 4 | * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe |
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| 5 | * Copyright (c) 2005, Herve Drolon, FreeImage Team |
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| 6 | * All rights reserved. |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions |
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| 10 | * are met: |
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| 11 | * 1. Redistributions of source code must retain the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer. |
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer in the |
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| 15 | * documentation and/or other materials provided with the distribution. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
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| 18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 21 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 22 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 23 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 24 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 25 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 26 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 27 | * POSSIBILITY OF SUCH DAMAGE. |
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| 28 | */ |
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| 29 | |||
| 30 | #include "opj_includes.h" |
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| 31 | |||
| 32 | /* |
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| 33 | ========================================================== |
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| 34 | local functions |
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| 35 | ========================================================== |
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| 36 | */ |
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| 37 | |||
| 38 | |||
| 39 | /* |
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| 40 | ========================================================== |
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| 41 | RAW encoding interface |
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| 42 | ========================================================== |
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| 43 | */ |
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| 44 | |||
| 45 | opj_raw_t* raw_create(void) { |
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| 46 | opj_raw_t *raw = (opj_raw_t*)opj_malloc(sizeof(opj_raw_t)); |
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| 47 | return raw; |
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| 48 | } |
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| 49 | |||
| 50 | void raw_destroy(opj_raw_t *raw) { |
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| 51 | if(raw) { |
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| 52 | opj_free(raw); |
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| 53 | } |
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| 54 | } |
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| 55 | |||
| 56 | int raw_numbytes(opj_raw_t *raw) { |
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| 57 | return raw->bp - raw->start; |
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| 58 | } |
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| 59 | |||
| 60 | void raw_init_dec(opj_raw_t *raw, unsigned char *bp, int len) { |
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| 61 | raw->start = bp; |
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| 62 | raw->lenmax = len; |
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| 63 | raw->len = 0; |
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| 64 | raw->c = 0; |
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| 65 | raw->ct = 0; |
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| 66 | } |
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| 67 | |||
| 68 | int raw_decode(opj_raw_t *raw) { |
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| 69 | int d; |
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| 70 | if (raw->ct == 0) { |
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| 71 | raw->ct = 8; |
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| 72 | if (raw->len == raw->lenmax) { |
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| 73 | raw->c = 0xff; |
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| 74 | } else { |
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| 75 | if (raw->c == 0xff) { |
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| 76 | raw->ct = 7; |
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| 77 | } |
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| 78 | raw->c = *(raw->start + raw->len); |
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| 79 | raw->len++; |
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| 80 | } |
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| 81 | } |
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| 82 | raw->ct--; |
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| 83 | d = (raw->c >> raw->ct) & 0x01; |
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| 84 | |||
| 85 | return d; |
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| 86 | } |
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| 87 |