diff options
Diffstat (limited to 'usr.sbin/vidcontrol/decode.c')
-rw-r--r-- | usr.sbin/vidcontrol/decode.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/usr.sbin/vidcontrol/decode.c b/usr.sbin/vidcontrol/decode.c new file mode 100644 index 0000000..88861db --- /dev/null +++ b/usr.sbin/vidcontrol/decode.c @@ -0,0 +1,74 @@ +/*- + * Copyright (c) 1994 Søren Schmidt + * 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. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software withough specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + * + * $Id: decode.c,v 1.1 1994/05/20 12:20:37 sos Exp $ + */ + +#include <stdio.h> + +int decode(FILE *fd, char *buffer) +{ + int n, pos = 0; + char *p; + char temp[128]; + +#define DEC(c) (((c) - ' ') & 0x3f) + + do { + if (!fgets(temp, sizeof(temp), fd)) + return(0); + } while (strncmp(temp, "begin ", 6)); + sscanf(temp, "begin %o %s", &n, temp); + for (;;) { + if (!fgets(p = temp, sizeof(temp), fd)) + return(0); + if ((n = DEC(*p)) <= 0) + break; + for (++p; n > 0; p += 4, n -= 3) + if (n >= 3) { + buffer[pos++] = DEC(p[0])<<2 | DEC(p[1])>>4; + buffer[pos++] = DEC(p[1])<<4 | DEC(p[2])>>2; + buffer[pos++] = DEC(p[2])<<6 | DEC(p[3]); + } + else { + if (n >= 1) { + buffer[pos++] = + DEC(p[0])<<2 | DEC(p[1])>>4; + } + if (n >= 2) { + buffer[pos++] = + DEC(p[1])<<4 | DEC(p[2])>>2; + } + if (n >= 3) { + buffer[pos++] = + DEC(p[2])<<6 | DEC(p[3]); + } + } + } + if (!fgets(temp, sizeof(temp), fd) || strcmp(temp, "end\n")) + return(0); + return(pos); +} |