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95 lines
3.0 KiB
95 lines
3.0 KiB
/* |
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* The copyright in this software is being made available under the 2-clauses |
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* BSD License, included below. This software may be subject to other third |
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* party and contributor rights, including patent rights, and no such rights |
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* are granted under this license. |
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* |
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* Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium |
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* Copyright (c) 2002-2014, Professor Benoit Macq |
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* Copyright (c) 2003-2007, Francois-Olivier Devaux |
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* Copyright (c) 2003-2014, Antonin Descampe |
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* Copyright (c) 2005, Herve Drolon, FreeImage Team |
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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* opj_raw_create(void) { |
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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 opj_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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OPJ_UINT32 opj_raw_numbytes(opj_raw_t *raw) { |
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const ptrdiff_t diff = raw->bp - raw->start; |
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assert( diff <= (ptrdiff_t)0xffffffff && diff >= 0 ); /* UINT32_MAX */ |
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return (OPJ_UINT32)diff; |
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} |
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void opj_raw_init_dec(opj_raw_t *raw, OPJ_BYTE *bp, OPJ_UINT32 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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OPJ_UINT32 opj_raw_decode(opj_raw_t *raw) { |
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OPJ_UINT32 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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