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, *cio_end, *cio_bp;
32 extern jmp_buf j2k_error;
35 /* Number of bytes written. */
39 return cio_bp - cio_start;
43 /* Get position in byte stream. */
47 return cio_bp - cio_start;
51 /* Set position in byte stream. */
53 void cio_seek(int pos)
55 cio_bp = cio_start + pos;
59 /* Number of bytes left before the end of the stream. */
61 int cio_numbytesleft()
63 return cio_end - cio_bp;
67 /* Get pointer to the current position in the stream. */
69 unsigned char *cio_getbp()
75 /* Initialize byte IO. */
77 void cio_init(unsigned char *bp, int len)
87 void cio_byteout(unsigned char v)
89 if (cio_bp >= cio_end)
90 longjmp(j2k_error, 1);
98 unsigned char cio_bytein()
100 if (cio_bp >= cio_end)
101 longjmp(j2k_error, 1);
108 void cio_write(unsigned int v, int n)
111 for (i = n - 1; i >= 0; i--) {
112 cio_byteout((unsigned char) ((v >> (i << 3)) & 0xff));
117 /* Read some bytes. */
119 unsigned int cio_read(int n)
124 for (i = n - 1; i >= 0; i--) {
125 v += cio_bytein() << (i << 3);
131 /* Write some bytes. */