diff options
Diffstat (limited to 'Build/source/texk/dvipdfm/ascii85.c')
-rw-r--r-- | Build/source/texk/dvipdfm/ascii85.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/Build/source/texk/dvipdfm/ascii85.c b/Build/source/texk/dvipdfm/ascii85.c new file mode 100644 index 00000000000..fd1b8efc0c4 --- /dev/null +++ b/Build/source/texk/dvipdfm/ascii85.c @@ -0,0 +1,90 @@ +/* $Header$ + + This is dvipdfm, a DVI to PDF translator. + Copyright (C) 1998, 1999 by Mark A. Wicks + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + The author may be contacted via the e-mail address + + mwicks@kettering.edu +*/ + + +#include <stdio.h> +#include <ctype.h> + +static int nextch(void) +{ + int ch; + while ((ch = getchar()) >= 0) { + if (ch >= '!' && ch <= 'u' || ch == 'z') + return ch; + if (ch == '~' && getchar() == '>') { + return -1; + } + } + if (ch < 0) { + fprintf (stderr, "Premature end of file.\n"); + exit(1); + } +} + +unsigned long int ascii85; +unsigned binary[4]; + +static decode_block(void) +{ + int i; + for (i=3; i>=0; i--){ + binary[i] = ascii85 % 256u; + ascii85 /= 256u; + } +} + +static output_block (int n) +{ + int i; + for (i=0; i<n; i++) { + putchar (binary[i]); + } +} + +main (int argc, char *argv[]) +{ + int i, ch, eof = 0, nread; + while (!eof) { + ascii85 = 0; + nread = 0; + /* Look ahead for special zero key */ + if ((ch = nextch()) == 'z') { + nread = 4; /* Lie to it */ + } else{ + ungetc (ch, stdin); + for (i=0; i<5; i++) { + if ((ch=nextch()) < 0) { + eof = 1; + break; + } + ascii85 = ascii85 * 85 + (ch-'!'); + nread += 1; + } + } + if (nread > 1) { + decode_block(); + output_block(nread-1); + } + } +} |