87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/*
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* Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
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* Copyright (c) 2005, HervŽ Drolon, FreeImage Team
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* Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "opj_includes.h"
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/*
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==========================================================
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local functions
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==========================================================
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*/
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/*
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==========================================================
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RAW encoding interface
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==========================================================
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*/
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opj_raw_t* raw_create() {
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opj_raw_t *raw = (opj_raw_t*)opj_malloc(sizeof(opj_raw_t));
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return raw;
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}
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void raw_destroy(opj_raw_t *raw) {
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if(raw) {
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opj_free(raw);
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}
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}
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int raw_numbytes(opj_raw_t *raw) {
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return raw->bp - raw->start;
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}
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void raw_init_dec(opj_raw_t *raw, unsigned char *bp, int len) {
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raw->start = bp;
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raw->lenmax = len;
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raw->len = 0;
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raw->c = 0;
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raw->ct = 0;
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}
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int raw_decode(opj_raw_t *raw) {
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int d;
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if (raw->ct == 0) {
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raw->ct = 8;
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if (raw->len == raw->lenmax) {
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raw->c = 0xff;
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} else {
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if (raw->c == 0xff) {
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raw->ct = 7;
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}
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raw->c = *(raw->start + raw->len);
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raw->len++;
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}
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}
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raw->ct--;
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d = (raw->c >> raw->ct) & 0x01;
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return d;
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}
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