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libbb: merge mail and uudecode's base64 decoders

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function                                             old     new   delta
read_base64                                            -     378    +378
uudecode_main                                        306     315      +9
parse                                                953     958      +5
read_stduu                                           250     254      +4
base64_main                                          217     219      +2
read_base64                                          358       -    -358
decode_base64                                        371       -    -371
------------------------------------------------------------------------------
(add/remove: 2/2 grow/shrink: 4/0 up/down: 398/-729)         Total: -331 bytes

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko
2010-09-16 17:51:13 +02:00
parent 52e460b744
commit 9fe98f701d
6 changed files with 90 additions and 139 deletions
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67
mailutils/mail.c
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@@ -161,73 +161,6 @@ void FAST_FUNC encode_base64(char *fname, const char *text, const char *eol)
#undef src_buf
}
void FAST_FUNC decode_base64(FILE *src_stream, FILE *dst_stream)
{
int term_count = 1;
while (1) {
char translated[4];
int count = 0;
while (count < 4) {
char *table_ptr;
int ch;
/* Get next _valid_ character.
* global vector bb_uuenc_tbl_base64[] contains this string:
* "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"
*/
do {
ch = fgetc(src_stream);
if (ch == EOF) {
bb_error_msg_and_die(bb_msg_read_error);
}
// - means end of MIME section
if ('-' == ch) {
// push it back
ungetc(ch, src_stream);
return;
}
table_ptr = strchr(bb_uuenc_tbl_base64, ch);
} while (table_ptr == NULL);
/* Convert encoded character to decimal */
ch = table_ptr - bb_uuenc_tbl_base64;
if (*table_ptr == '=') {
if (term_count == 0) {
translated[count] = '\0';
break;
}
term_count++;
} else if (*table_ptr == '\n') {
/* Check for terminating line */
if (term_count == 5) {
return;
}
term_count = 1;
continue;
} else {
translated[count] = ch;
count++;
term_count = 0;
}
}
/* Merge 6 bit chars to 8 bit */
if (count > 1) {
fputc(translated[0] << 2 | translated[1] >> 4, dst_stream);
}
if (count > 2) {
fputc(translated[1] << 4 | translated[2] >> 2, dst_stream);
}
if (count > 3) {
fputc(translated[2] << 6 | translated[3], dst_stream);
}
}
}
/*
* get username and password from a file descriptor
*/