2 * Copyright (c) 1994 Søren Schmidt
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 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 static const char rcsid[] =
38 int decode(FILE *fd, char *buffer, int len)
45 #define DEC(c) (((c) - ' ') & 0x3f)
48 if (!fgets(temp, sizeof(temp), fd))
50 } while (strncmp(temp, "begin ", 6));
51 sscanf(temp, "begin %o %s", (unsigned *)&n, temp);
54 if (!fgets(p = temp, sizeof(temp), fd))
56 if ((n = DEC(*p)) <= 0)
58 for (++p; n > 0; p += 4, n -= 3) {
61 tbuffer[tpos++] = DEC(p[0])<<2 | DEC(p[1])>>4;
62 tbuffer[tpos++] = DEC(p[1])<<4 | DEC(p[2])>>2;
63 tbuffer[tpos++] = DEC(p[2])<<6 | DEC(p[3]);
68 DEC(p[0])<<2 | DEC(p[1])>>4;
72 DEC(p[1])<<4 | DEC(p[2])>>2;
76 DEC(p[2])<<6 | DEC(p[3]);
81 if (tpos + pos > len) {
84 * Arrange return value > len to indicate
89 bcopy(tbuffer, bp, tpos);
96 if (!fgets(temp, sizeof(temp), fd) || strcmp(temp, "end\n"))