2 * Copyright (c) 2001-2002, David Janssens
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
30 static unsigned char *cio_start; /* pointer to the start of the stream */
31 static unsigned char *cio_end; /* pointer to the end of the stream */
32 static unsigned char *cio_bp; /* pointer to the present position */
34 extern jmp_buf j2k_error;
37 * Number of bytes written.
41 return cio_bp - cio_start;
45 * Get position in byte stream.
49 return cio_bp - cio_start;
53 * Set position in byte stream.
55 * pos : position, in number of bytes, from the beginning of the stream
57 void cio_seek(int pos)
59 cio_bp = cio_start + pos;
63 * Number of bytes left before the end of the stream.
65 int cio_numbytesleft()
67 return cio_end - cio_bp;
71 * Get pointer to the current position in the stream.
73 unsigned char *cio_getbp()
81 * bp : destination/source stream
82 * len : length of the stream
84 void cio_init(unsigned char *bp, int len)
94 void cio_byteout(unsigned char v)
96 if (cio_bp >= cio_end)
97 longjmp(j2k_error, 1);
105 unsigned char cio_bytein()
107 if (cio_bp >= cio_end)
108 longjmp(j2k_error, 1);
116 * n : number of bytes to write
118 void cio_write(unsigned int v, int n)
121 for (i = n - 1; i >= 0; i--) {
122 cio_byteout((unsigned char) ((v >> (i << 3)) & 0xff));
129 * n : number of bytes to read
131 * return : value of the n bytes read
133 unsigned int cio_read(int n)
138 for (i = n - 1; i >= 0; i--) {
139 v += cio_bytein() << (i << 3);
147 * n : number of bytes to skip