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/* uufilter.c:
*
* "smart" uudecode function that skips junk lines and outputs data to
* stdout rather than a filename.
*
* jim frost 10.21.93
*
* 10.27.93 fixed a bug where short uuencoded lines were stripped out
* due to a bad "short length" calculation. added -v flag at
* the same time.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(argc, argv)
int argc;
char **argv;
{
FILE *inf, *outf;
char *infilename = NULL;
char *outfilename = NULL;
int dump_to_file = 1; /* true if we're outputting to a file */
int stringent = 1; /* true if we're really stringent about data lines */
int verbose = 0; /* true if we're babbling about what we're skipping */
char buf[1024];
int i, len;
int phase = 0;
unsigned char outchar;
for (i = 1; i < argc; i++) {
if (!strcmp(argv[i], "-s")) /* output to stdout */
dump_to_file = 0;
else if (!strcmp(argv[i], "-l")) /* lenient mode */
stringent = 0;
else if (!strcmp(argv[i], "-f")) { /* output to named file */
dump_to_file = 1;
outfilename = argv[++i];
}
else if (!strcmp(argv[i], "-v")) /* verbose output */
verbose = 1;
else {
infilename = argv[i];
break;
}
}
if (infilename == NULL) {
inf = stdin;
infilename = "stdin";
}
else {
inf = fopen(infilename, "r");
if (inf == NULL) {
perror(infilename);
exit(1);
}
}
/* scan for "begin" line
*/
while (fgets(buf, 1024, inf) != NULL) {
if (!strncmp(buf, "begin ", 6))
break;
if (verbose)
fprintf(stderr, "Ignoring header line: %s\n", buf);
}
if (feof(inf)) {
fprintf(stderr, "%s: No 'begin' line, sorry.\n", infilename);
exit(1);
}
if (dump_to_file) {
int mode; /* ignored */
char tmp[1024];
if (!outfilename) {
if (sscanf(buf, "begin %o %s", &mode, tmp) != 2) {
fprintf(stderr, "%s: Bad format for 'begin' line (can't dump to file)\n", infilename);
exit(1);
}
outfilename = tmp;
}
fprintf(stderr, "Decoding into file %s\n", outfilename);
outf = fopen(outfilename, "w");
if (outf == NULL) {
perror(outfilename);
exit(1);
}
}
else
outf = stdout;
for (;;) {
char *bp;
if (fgets(buf, 1024, inf) == NULL) {
fprintf(stderr, "%s: Missing 'end' line.\n", infilename);
break;
}
if (!strncmp(buf, "end", 3))
break; /* end of data */
/* strip off trailing characters
*/
len = strlen(buf) - 1;
while ((buf[len] == '\n') || (buf[len] == '\r'))
buf[len--] = '\0';
/* character conversion and "obvious" filtering
*/
for (; len >= 0; len--) {
if ((buf[len] >= 'a') || (buf[len] < ' '))
break; /* garbage character seen */
if (buf[len] == '`')
buf[len] = ' ';
}
if (len >= 0) {
if (verbose)
fprintf(stderr, "Ignoring garbage line: %s\n", buf);
continue; /* line had garbage, ignore it */
}
if (buf[0] == '\0')
continue; /* line is blank, ignore it */
len = buf[0] - ' ';
/* ok, see if the line length looks sane.
*/
{
int line_len = strlen(buf) - 1;
int allow_len;
/* if the line is shorter than the absolute minimum
* allowable then we're sure this is not a valid line.
*/
allow_len = ((len * 4) / 3) + ((len * 4) % 3);
if (line_len < allow_len) {
if (verbose)
fprintf(stderr, "Ignoring short line: %s\n", buf);
continue;
}
/* if we're being really stringent about the lines we allow
* this filters out any lines that are too long, too. note
* that this is still fairly lenient; it allows uuencode
* programs to pad the line length out to a multiple of
* 3 bytes.
*/
if (stringent) {
allow_len = ((len + 2) * 4) / 3;
if (line_len > allow_len) {
if (verbose)
fprintf(stderr, "Ignoring long line: %s\n", buf);
continue;
}
}
}
/* ok, we have some characters -- process them!
*/
bp = &buf[1];
phase = 0;
outchar = 0;
while (len > 0) {
unsigned char c;
c = (unsigned char)*(bp++) - ' ';
switch (phase) {
case 0: /* 1st 6 bits */
outchar = (c << 2);
break;
case 1: /* last 2 bits, 1st 4 bits */
outchar |= (c >> 4);
fputc(outchar, outf);
len--;
outchar = (c & 0xf) << 4;
break;
case 2: /* last 4 bits, 1st 2 bits */
outchar |= (c >> 2);
fputc(outchar, outf);
len--;
outchar = (c & 0x3) << 6;
break;
case 3: /* last 6 bits */
outchar |= c;
fputc(outchar, outf);
len--;
phase = 0;
continue;
}
phase++;
}
}
/* flush output
*/
if (outf == stdout)
fflush(outf);
else
fclose(outf);
/* suck up the rest of the input file. this avoids "broken pipe"
* errors if reading from stdin.
*/
if (inf == stdin) {
while (fgets(buf, 1024, inf) != NULL)
if (verbose)
fprintf(stderr, "Ignoring trailing line: %s\n", buf);
}
else
fclose(inf);
exit(0);
}
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