188 lines
4.4 KiB
C
188 lines
4.4 KiB
C
/*
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* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
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* Copyright (c) 2002-2007, Professor Benoit Macq
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* Copyright (c) 2001-2003, David Janssens
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* Copyright (c) 2002-2003, Yannick Verschueren
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* Copyright (c) 2003-2007, Francois-Olivier Devaux and 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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/** @defgroup BIO BIO - Individual bit input-output stream */
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/*@{*/
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/** @name Local static functions */
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/*@{*/
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/**
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Write a bit
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@param bio BIO handle
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@param b Bit to write (0 or 1)
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*/
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static void bio_putbit(opj_bio_t *bio, int b);
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/**
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Read a bit
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@param bio BIO handle
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@return Returns the read bit
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*/
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static int bio_getbit(opj_bio_t *bio);
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/**
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Write a byte
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@param bio BIO handle
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@return Returns 0 if successful, returns 1 otherwise
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*/
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static int bio_byteout(opj_bio_t *bio);
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/**
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Read a byte
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@param bio BIO handle
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@return Returns 0 if successful, returns 1 otherwise
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*/
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static int bio_bytein(opj_bio_t *bio);
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/*@}*/
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/*@}*/
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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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static int bio_byteout(opj_bio_t *bio) {
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bio->buf = (bio->buf << 8) & 0xffff;
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bio->ct = bio->buf == 0xff00 ? 7 : 8;
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if (bio->bp >= bio->end) {
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return 1;
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}
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*bio->bp++ = bio->buf >> 8;
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return 0;
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}
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static int bio_bytein(opj_bio_t *bio) {
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bio->buf = (bio->buf << 8) & 0xffff;
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bio->ct = bio->buf == 0xff00 ? 7 : 8;
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if (bio->bp >= bio->end) {
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return 1;
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}
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bio->buf |= *bio->bp++;
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return 0;
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}
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static void bio_putbit(opj_bio_t *bio, int b) {
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if (bio->ct == 0) {
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bio_byteout(bio);
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}
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bio->ct--;
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bio->buf |= b << bio->ct;
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}
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static int bio_getbit(opj_bio_t *bio) {
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if (bio->ct == 0) {
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bio_bytein(bio);
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}
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bio->ct--;
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return (bio->buf >> bio->ct) & 1;
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}
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/*
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==========================================================
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Bit Input/Output interface
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==========================================================
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*/
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opj_bio_t* bio_create() {
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opj_bio_t *bio = (opj_bio_t*)opj_malloc(sizeof(opj_bio_t));
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return bio;
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}
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void bio_destroy(opj_bio_t *bio) {
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if(bio) {
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opj_free(bio);
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}
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}
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int bio_numbytes(opj_bio_t *bio) {
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return (bio->bp - bio->start);
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}
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void bio_init_enc(opj_bio_t *bio, unsigned char *bp, int len) {
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bio->start = bp;
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bio->end = bp + len;
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bio->bp = bp;
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bio->buf = 0;
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bio->ct = 8;
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}
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void bio_init_dec(opj_bio_t *bio, unsigned char *bp, int len) {
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bio->start = bp;
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bio->end = bp + len;
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bio->bp = bp;
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bio->buf = 0;
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bio->ct = 0;
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}
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void bio_write(opj_bio_t *bio, int v, int n) {
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int i;
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for (i = n - 1; i >= 0; i--) {
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bio_putbit(bio, (v >> i) & 1);
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}
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}
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int bio_read(opj_bio_t *bio, int n) {
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int i, v;
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v = 0;
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for (i = n - 1; i >= 0; i--) {
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v += bio_getbit(bio) << i;
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}
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return v;
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}
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int bio_flush(opj_bio_t *bio) {
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bio->ct = 0;
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if (bio_byteout(bio)) {
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return 1;
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}
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if (bio->ct == 7) {
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bio->ct = 0;
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if (bio_byteout(bio)) {
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return 1;
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}
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}
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return 0;
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}
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int bio_inalign(opj_bio_t *bio) {
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bio->ct = 0;
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if ((bio->buf & 0xff) == 0xff) {
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if (bio_bytein(bio)) {
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return 1;
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}
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bio->ct = 0;
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}
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return 0;
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}
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