130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/*
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* Copyright (c) 2001-2002, David Janssens
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* Copyright (c) 2003, Yannick Verschueren
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* Copyright (c) 2003, 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 "cio.h"
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#include <setjmp.h>
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static unsigned char *cio_start, *cio_end, *cio_bp;
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extern jmp_buf j2k_error;
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/// <summary>
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/// Number of bytes written.
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/// </summary>
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int cio_numbytes() {
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return cio_bp-cio_start;
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}
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/// <summary>
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/// Get position in byte stream.
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/// </summary>
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int cio_tell() {
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return cio_bp-cio_start;
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}
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/// <summary>
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/// Set position in byte stream.
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/// </summary>
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void cio_seek(int pos) {
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cio_bp=cio_start+pos;
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}
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/// <summary>
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/// Number of bytes left before the end of the stream.
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/// </summary>
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int cio_numbytesleft() {
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return cio_end-cio_bp;
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}
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/// <summary>
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/// Get pointer to the current position in the stream.
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/// </summary>
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unsigned char *cio_getbp() {
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return cio_bp;
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}
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/// <summary>
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/// Initialize byte IO.
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/// </summary>
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void cio_init(unsigned char *bp, int len) {
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cio_start=bp;
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cio_end=bp+len;
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cio_bp=bp;
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}
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/// <summary>
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/// Write a byte.
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/// </summary>
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void cio_byteout(unsigned char v) {
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if (cio_bp>=cio_end) longjmp(j2k_error, 1);
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*cio_bp++=v;
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}
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/// <summary>
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/// Read a byte.
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/// </summary>
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unsigned char cio_bytein() {
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if (cio_bp>=cio_end) longjmp(j2k_error, 1);
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return *cio_bp++;
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}
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/// <summary>
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/// Write a byte.
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/// </summary>
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//void cio_write(unsigned int v, int n) {
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void cio_write(long long v, int n) {
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int i;
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for (i=n-1; i>=0; i--)
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{
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cio_byteout((unsigned char)((v>>(i<<3))&0xff));
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}
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}
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/// <summary>
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/// Read some bytes.
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/// </summary>
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/* unsigned int cio_read(int n) { */
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long long cio_read(int n) {
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int i;
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/*unsigned int v;*/
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long long v;
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v=0;
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for (i=n-1; i>=0; i--) {
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v+=cio_bytein()<<(i<<3);
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}
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return v;
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}
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/// <summary>
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/// Write some bytes.
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/// </summary>
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void cio_skip(int n) {
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cio_bp+=n;
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}
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