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9fe98f701d
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>
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright 2003, Glenn McGrath
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* Copyright 2010, Denys Vlasenko
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#include "libbb.h"
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//kbuild:lib-y += base64.o
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void FAST_FUNC read_base64(FILE *src_stream, FILE *dst_stream, int flags)
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{
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/* Note that EOF _can_ be passed as exit_char too */
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#define exit_char ((int)(signed char)flags)
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#define uu_style_end (flags & BASE64_FLAG_UUEND)
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int term_count = 0;
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while (1) {
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unsigned char translated[4];
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int count = 0;
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/* Process one group of 4 chars */
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while (count < 4) {
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char *table_ptr;
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int ch;
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/* Get next _valid_ character.
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* bb_uuenc_tbl_base64[] contains this string:
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* 0 1 2 3 4 5 6
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* 012345678901234567890123456789012345678901234567890123456789012345
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* "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"
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*/
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do {
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ch = fgetc(src_stream);
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if (ch == exit_char && count == 0)
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return;
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if (ch == EOF)
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bb_error_msg_and_die("truncated base64 input");
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table_ptr = strchr(bb_uuenc_tbl_base64, ch);
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//TODO: add BASE64_FLAG_foo to die on bad char?
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//Note that then we may need to still allow '\r' (for mail processing)
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} while (!table_ptr);
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/* Convert encoded character to decimal */
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ch = table_ptr - bb_uuenc_tbl_base64;
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if (ch == 65 /* '\n' */) {
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/* Terminating "====" line? */
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if (uu_style_end && term_count == 4)
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return; /* yes */
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continue;
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}
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/* ch is 64 if char was '=', otherwise 0..63 */
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translated[count] = ch & 63; /* 64 -> 0 */
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if (ch == 64) {
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term_count++;
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break;
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}
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term_count = 0;
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count++;
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}
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/* Merge 6 bit chars to 8 bit.
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* count can be < 4 when we decode the tail:
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* "eQ==" -> "y", not "y NUL NUL"
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*/
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if (count > 1)
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fputc(translated[0] << 2 | translated[1] >> 4, dst_stream);
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if (count > 2)
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fputc(translated[1] << 4 | translated[2] >> 2, dst_stream);
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if (count > 3)
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fputc(translated[2] << 6 | translated[3], dst_stream);
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} /* while (1) */
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}
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