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UUD.C
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1991-11-06
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6KB
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281 lines
/*
* Uudecode -- decode a uuencoded file back to binary form.
*
* modified for Lattice C on the ST - 11.05.86 by MSD
* modified for Alcyon on the ST - 10-24-86 by RDR
* modified (a lot) for MWC on the ST 02/07/87 by JPHD
* (Some more to be done on the I/O speed...)
*
*/
#include <stdio.h>
#ifdef ATARI_ST
#include <osbind.h>
#endif
extern FILE *fopen();
extern char *strcpy();
char *getnword();
#define MAXCHAR 127
#define LINELEN 80
#define FILELEN 64
#define CODEDLN 61
#define NORMLEN 45
char *mism = "Part suffix mismatch: <%> instead of <%>.\r\n";
#define SUBS1 23
#define SUBS2 38
FILE *in, *out;
char ifname[FILELEN];
char chtbl[MAXCHAR];
char *pos;
char blank, part = '\0';
int partn = 'a';
int lens;
main(argc, argv) int argc; char *argv[];
{
register int i, j;
char dest[FILELEN], buf[LINELEN];
if (argc < 2) {
Console("Almost foolproof uudecode v1.0 15-Feb-1987 JPHD\r\n");
Console("Usage: uudecode inputfile\r\n");
exit(1);
}
if((in = fopen(argv[1], "r")) == NULL) {
Console("Cant open input file.\r\n");
exit(2);
}
/*
* Set up the default translation table.
*/
for (i = 0; i < ' '; i++) chtbl[i] = '\0';
for (i = ' ', j = 0; i < ' ' + 64; i++, j++) chtbl[i] = j;
for (i = ' ' + 64; i < MAXCHAR; i++) chtbl[i] = '\0';
chtbl['`'] = chtbl[' ']; /* common mutation */
chtbl['~'] = chtbl['^']; /* an other common mutation */
blank = ' ';
/*
* search for header or translation table line.
*/
for (;;) {
if (fgets(buf, sizeof buf, in) == NULL) {
Console("No begin line\r\n");
exit(3);
}
if (strncmp(buf, "table", 5) == 0) {
gettable();
continue;
}
if (strncmp(buf, "begin", 5) == 0) {
break;
}
}
lens = strlen(buf);
if (lens) buf[--lens] = '\0';
if ((pos = getnword(buf, 3)) == NULL) {
Console("Missing filename in begin line.\r\n");
exit(10);
} else
strcpy(dest, pos);
if((out = fopen(dest, "wb")) == NULL) {
Console("Cannot open output file\r\n");
exit(4);
}
decode();
fclose(out);
exit(0);
}
/*
* Bring back a pointer to the start of the nth word.
*/
char *getnword(str, n) register char *str; register int n;
{
while((*str == '\t') || (*str == ' ')) str++;
if (! *str) return NULL;
while(--n) {
while ((*str != '\t') && (*str != ' ') && (*str)) str++;
if (! *str) return NULL;
while((*str == '\t') || (*str == ' ')) str++;
if (! *str) return NULL;
}
return str;
}
/*
* Install the table in memory for later use.
*/
gettable()
{
char buf[LINELEN];
register int c, n = 0;
register char *cpt;
for (c = 0; c <= MAXCHAR; c++) chtbl[c] = '\0';
again: if (fgets(buf, sizeof buf, in) == NULL) {
Console("EOF while in translation table.\r\n");
exit(5);
}
if (strncmp(buf, "begin", 5) == 0) {
Console("Incomplete translation table.\r\n");
exit(6);
}
cpt = buf + strlen(buf) - 1;
*cpt = ' ';
while (*(cpt) == ' ') {
*cpt = '\0';
cpt--;
}
cpt = buf;
while (c = *cpt) {
if (chtbl[c] != '\0') {
Console("Duplicate char in translation table.\n");
exit(6);
}
if (n == 0) blank = c;
chtbl[c] = n++;
if (n >= 64) return;
cpt++;
}
goto again;
}
/*
* copy from in to out, decoding as you go along.
*/
decode()
{
char buf[LINELEN], outl[LINELEN];
register char *bp, *ut, *trtbl = chtbl;
register unsigned int n, c, len;
for (;;) {
if (fgets(buf, sizeof buf, in) == NULL) {
Console("Short file.\r\n");
return;
}
len = strlen(buf);
if (len) buf[--len] = '\0';
/*
* Get the binary line length.
*/
n = trtbl[*buf];
if (n == NORMLEN) goto decod;
/*
* end of uuencoded file ?
*/
if (strncmp(buf, "end", 3) == 0) return;
/*
* end of current file ? : get next one.
*/
if (strncmp(buf, "include", 7) == 0) {
getfile(buf);
continue;
}
/*
* Is it the empty line before the end line ?
*/
if (n <= 0) continue;
/*
* Pad with blanks.
*/
decod: for (bp = &buf[c = len];
c < CODEDLN; c++, bp++) *bp = blank;
/*
* output a group of 3 bytes (4 input characters).
* the input chars are pointed to by p, they are to
* be output to file f. n is used to tell us not to
* output all of them at the end of the file.
*/
ut = outl;
len = n;
bp = &buf[1];
while (n > 0) {
*(ut++) = trtbl[*bp] << 2 | trtbl[bp[1]] >> 4;
n--;
if (n) {
*(ut++) = trtbl[bp[1]] << 4 | trtbl[bp[2]] >> 2;
n--;
}
if (n) {
*(ut++) = trtbl[bp[2]] << 6 | trtbl[bp[3]];
n--;
}
bp += 4;
}
n = fwrite(outl, 1, len, out);
}
}
/* you may need to rename the filenames at the ends of each part
* if the encoder encoded them on directories and specified drives.
*/
getfile(buf) register char *buf;
{
if ((pos = getnword(buf, 2)) == NULL) {
Console("Missing include file name.\r\n");
exit(11);
} else
strcpy(ifname, pos);
if (freopen(ifname, "r", in) != in) {
Console("Cannot reassign input file to included file.\r\n");
exit(7);
}
for (;;) {
if (fgets(buf, LINELEN, in) == NULL) {
Console("No begin line in included file: ");
Console(ifname);
Console(".\r\n");
exit(3);
}
if (strncmp(buf, "table", 5) == 0) {
gettable();
continue;
}
if (strncmp(buf, "begin", 5) == 0) {
break;
}
}
lens = strlen(buf);
if (lens) buf[--lens] = '\0';
if ((pos = getnword(buf, 3)) == NULL ) {
Console("Missing part name, in included begin line.\r\n");
part = '?';
} else {
part = *pos;
/*
* Check the part suffix.
*/
partn++;
if (part != partn) {
mism[SUBS1] = part;
mism[SUBS2] = partn;
Console(mism);
}
}
}
/*
* Output to console, immune against redirection of stdout.
*/
Console(s) register char *s;
{
#ifdef ATARI_ST
while (*s) Bconout(2,*s++);
#else
while (*s) fputc(*s++,stderr);
#endif
}