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/*-
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int
decode_char(int c)
{
return (c - 32) & 0x3f;
}
static int
decode_line(const char *line, FILE *out)
{
int length;
int produced;
length = decode_char((unsigned char)line[0]);
if (length == 0)
return 0;
line++;
produced = 0;
while (produced < length) {
unsigned char a;
unsigned char b;
unsigned char c;
unsigned char d;
unsigned char bytes[3];
int chunk;
if (line[0] == '\0' || line[1] == '\0' || line[2] == '\0' ||
line[3] == '\0') {
fprintf(stderr, "uu_decode: truncated uuencoded line\n");
return -1;
}
a = (unsigned char)decode_char((unsigned char)line[0]);
b = (unsigned char)decode_char((unsigned char)line[1]);
c = (unsigned char)decode_char((unsigned char)line[2]);
d = (unsigned char)decode_char((unsigned char)line[3]);
line += 4;
bytes[0] = (unsigned char)((a << 2) | (b >> 4));
bytes[1] = (unsigned char)((b << 4) | (c >> 2));
bytes[2] = (unsigned char)((c << 6) | d);
chunk = length - produced;
if (chunk > 3)
chunk = 3;
if (fwrite(bytes, 1, (size_t)chunk, out) != (size_t)chunk) {
fprintf(stderr, "uu_decode: write failed: %s\n",
strerror(errno));
return -1;
}
produced += chunk;
}
return 0;
}
int
main(int argc, char **argv)
{
FILE *in;
FILE *out;
char line[4096];
int seen_begin;
if (argc != 3) {
fprintf(stderr, "usage: %s input.uu output\n", argv[0]);
return 1;
}
in = fopen(argv[1], "r");
if (in == NULL) {
fprintf(stderr, "uu_decode: cannot open %s: %s\n", argv[1],
strerror(errno));
return 1;
}
out = fopen(argv[2], "wb");
if (out == NULL) {
fprintf(stderr, "uu_decode: cannot open %s: %s\n", argv[2],
strerror(errno));
fclose(in);
return 1;
}
seen_begin = 0;
while (fgets(line, sizeof(line), in) != NULL) {
size_t len;
len = strlen(line);
if (len > 0 && line[len - 1] == '\n')
line[len - 1] = '\0';
if (!seen_begin) {
if (strncmp(line, "begin ", 6) == 0)
seen_begin = 1;
continue;
}
if (strcmp(line, "end") == 0)
break;
if (decode_line(line, out) != 0) {
fclose(out);
fclose(in);
return 1;
}
}
if (fclose(out) != 0) {
fprintf(stderr, "uu_decode: cannot close %s: %s\n", argv[2],
strerror(errno));
fclose(in);
return 1;
}
if (fclose(in) != 0) {
fprintf(stderr, "uu_decode: cannot close %s: %s\n", argv[1],
strerror(errno));
return 1;
}
if (!seen_begin) {
fprintf(stderr, "uu_decode: missing begin line in %s\n", argv[1]);
return 1;
}
return 0;
}
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