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ppcuuwos.lha
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PPCUUDecode.c
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C/C++ Source or Header
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1998-02-18
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7KB
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244 lines
/*
* uudecode [input]
*
* Decode a file encoded with uuencode. Will extract multiple encoded
* modules from a single file. Can deal with most mangled files, including
* those that have been mangled by common BITNET problems.
*
*/
/* Modified by Steffen P. Häuser (ELF-Version was from Andreas Kleinert)
*
* 18.02.98: - WarpOS (TM) version, compiled with StormC, as ELF sucks :)
*
* 07.02.98: - powerUP (TM) version, compiled with SAS/C for PPC
*
* 31.08.97: - reworked for SAS/C 6.58
* - better compiler settings
* - ANSI-fied
*
* 04.08.94: - first, internal version
*
*
*
* Original authors:
*
* Written by Mark Horton
* Modified by ajr (Alan J Rosenthatl,flaps@utcsri.UUCP) to use checksums
* Modified by fnf (Fred Fish,well!fnf) to use Keith Pyle's suggestion for
* compatibility
* Modified by bcn (Bryce Nesbitt,ucbvax!cogsci!bryce) to fix a misleading
* error message on the Amiga port, to fix a bug that prevented decoding
* certain files, to work even if trailing spaces have been removed from a
* file, to check the filesize (if present), to add some error checking, to
* loop for multiple decodes from a single file, and to handle common
* BITNET mangling. Kludged around a missing string function in Aztec
* C. Changed "r" to "rb" and "w" to "wb" for Messy-dos machines
* (Thanks to Andrew Wylie).
*/
#define __USE_SYSBASE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <exec/types.h>
#include <clib/exec_protos.h>
void decode(FILE *in, FILE *out, UBYTE *dest);
UBYTE version [] = "\0$VER: uudecode 1.0 (7.2.98)";
long main(long argc, char **argv)
{
FILE *in, *out;
LONG through_loop = 0; /* Dejavu indicator */
LONG mode; /* file's mode (from header) */
LONG filesize; /* theoretical file size (from header) */
UBYTE dest[128];
UBYTE buf[80];
/* A filename can be specified to be uudecoded, or nothing can
be specified, and the input will come from STDIN */
switch (argc)
{
case 1:
in=stdin;
break;
case 2:
if ((in = fopen(argv[1], "r")) == NULL)
{
fprintf(stderr, "ERROR: can't find %s\n", argv[1]);
fprintf(stderr, "USAGE: uudecode [infile]\n");
exit(20);
}
break;
default:
fprintf(stderr, "USAGE: uudecode [infile]\n");
exit(0);
break;
}
/* Loop through file, searching for headers. Decode anything with a
header, complain if there where no headers. */
for (;;)
{
/* search file for header line */
for (;;)
{
if (fgets(buf, sizeof buf, in) == NULL)
{
if (!through_loop)
{
fprintf(stderr, "ERROR: no `begin' line!\n");
exit(20);
}
else
{
exit(0);
}
}
if (strncmp(buf, "begin ", 6) == 0)
break;
}
sscanf(buf, "begin %o %s", &mode, dest);
/* create output file */
if ((out = fopen(dest, "w")) == NULL)
{
fprintf(stderr, "ERROR: can't open output file %s\n", dest);
exit(20);
}
decode(in, out, dest);
if (fgets(buf, sizeof buf, in) == NULL || strncmp(buf,"end",3))
{ /* don't be overly picky about newline ^ */
fprintf(stderr, "ERROR: no `end' line\n");
exit(20);
}
if (!(fgets(buf,sizeof buf,in) == NULL || strncmp(buf,"size ",3)))
{
sscanf(buf, "size %ld", &filesize);
if (ftell(out) != filesize)
{
fprintf(stderr, "ERROR: file should have been %ld bytes long but was %ld.\n", filesize, ftell(out));
exit(20);
}
}
through_loop = 1;
} /* forever */
exit(0);
}
#define SUMSIZE 64
#define DEC(c) (((c) - ' ') & 077) /* single character decode */
/*
* Copy from in to out, decoding as you go.
* If a return or newline is encountered too early in a line, it is
* assumed that means that some editor has truncated trailing spaces.
*/
void decode(FILE *in, FILE *out, UBYTE *dest)
{
extern errno;
UBYTE *bp;
LONG nosum=0;
LONG j, n, checksum, line;
UBYTE buf[256];
for (line = 1; ; line++) /* for each input line */
{
if (fgets(buf, sizeof buf, in) == NULL)
{
fprintf(stderr, "ERROR: input ended unexpectedly!\n");
exit(20);
}
/* Pad end of lines in case some editor truncated trailing
spaces */
for (n=0;n<79;n++) /* search for first \r, \n or \000 */
{
if (buf[n]=='\176') /* If BITNET made a twiddle, */
buf[n]='\136'; /* we make a caret */
if (buf[n]=='\r'||buf[n]=='\n'||buf[n]=='\000')
break;
}
for (;n<79;n++) /* when found, fill rest of line with space */
{
buf[n]=' ';
}
buf[79]=0; /* terminate new string */
checksum = 0;
n = DEC(buf[0]);
if (n <= 0)
break; /* 0 bytes on a line?? Must be the last line */
bp = &buf[1];
/* FOUR input characters go into each THREE output charcters */
while (n >= 4)
{
j = DEC(bp[0]) << 2 | DEC(bp[1]) >> 4; putc(j, out); checksum += j;
j = DEC(bp[1]) << 4 | DEC(bp[2]) >> 2; putc(j, out); checksum += j;
j = DEC(bp[2]) << 6 | DEC(bp[3]); putc(j, out); checksum += j;
checksum = checksum % SUMSIZE;
bp += 4;
n -= 3;
}
j = DEC(bp[0]) << 2 | DEC(bp[1]) >> 4;
checksum += j;
if (n >= 1)
putc(j, out);
j = DEC(bp[1]) << 4 | DEC(bp[2]) >> 2;
checksum += j;
if (n >= 2)
putc(j, out);
j = DEC(bp[2]) << 6 | DEC(bp[3]);
checksum += j;
if (n >= 3)
putc(j, out);
checksum = checksum % SUMSIZE;
bp += 4;
n -= 3;
/* Error checking under UNIX??? You must be kidding... */
/* Check if an error occured while writing to that last line */
if (errno)
{
fprintf(stderr, "ERROR: error writing to %s\n",dest);
exit(20);
}
/* The line has been decoded; now check that sum */
nosum |= !isspace(*bp);
if (nosum) /* Is there a checksum at all?? */
{
if (checksum != DEC(*bp)) /* Does that checksum match? */
{
fprintf(stderr, "ERROR: checksum mismatch decoding %s, line %d.\n",dest, line);
}
} /* sum */
} /* line */
} /* function */