| /* |
| * Copyright (c) 2001-2002, David Janssens |
| * Copyright (c) 2003, Yannick Verschueren |
| * Copyright (c) 2003, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "cio.h" |
| #include <setjmp.h> |
| |
| static unsigned char *cio_start, *cio_end, *cio_bp; |
| |
| extern jmp_buf j2k_error; |
| |
| /// <summary> |
| /// Number of bytes written. |
| /// </summary> |
| int cio_numbytes() { |
| return cio_bp-cio_start; |
| } |
| |
| /// <summary> |
| /// Get position in byte stream. |
| /// </summary> |
| int cio_tell() { |
| return cio_bp-cio_start; |
| } |
| |
| /// <summary> |
| /// Set position in byte stream. |
| /// </summary> |
| void cio_seek(int pos) { |
| cio_bp=cio_start+pos; |
| } |
| |
| /// <summary> |
| /// Number of bytes left before the end of the stream. |
| /// </summary> |
| int cio_numbytesleft() { |
| return cio_end-cio_bp; |
| } |
| |
| /// <summary> |
| /// Get pointer to the current position in the stream. |
| /// </summary> |
| unsigned char *cio_getbp() { |
| return cio_bp; |
| } |
| |
| /// <summary> |
| /// Initialize byte IO. |
| /// </summary> |
| void cio_init(unsigned char *bp, int len) { |
| cio_start=bp; |
| cio_end=bp+len; |
| cio_bp=bp; |
| } |
| |
| /// <summary> |
| /// Write a byte. |
| /// </summary> |
| void cio_byteout(unsigned char v) { |
| if (cio_bp>=cio_end) longjmp(j2k_error, 1); |
| *cio_bp++=v; |
| |
| } |
| |
| /// <summary> |
| /// Read a byte. |
| /// </summary> |
| unsigned char cio_bytein() { |
| if (cio_bp>=cio_end) longjmp(j2k_error, 1); |
| return *cio_bp++; |
| } |
| |
| /// <summary> |
| /// Write a byte. |
| /// </summary> |
| //void cio_write(unsigned int v, int n) { |
| void cio_write(long long v, int n) { |
| int i; |
| for (i=n-1; i>=0; i--) |
| { |
| cio_byteout((unsigned char)((v>>(i<<3))&0xff)); |
| } |
| } |
| |
| /// <summary> |
| /// Read some bytes. |
| /// </summary> |
| /* unsigned int cio_read(int n) { */ |
| long long cio_read(int n) { |
| int i; |
| /*unsigned int v;*/ |
| long long v; |
| v=0; |
| for (i=n-1; i>=0; i--) { |
| v+=cio_bytein()<<(i<<3); |
| } |
| return v; |
| } |
| |
| /// <summary> |
| /// Write some bytes. |
| /// </summary> |
| void cio_skip(int n) { |
| cio_bp+=n; |
| } |