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authorDenys Vlasenko <dvlasenk@redhat.com>2010-09-16 18:10:04 +0200
committerDenys Vlasenko <dvlasenk@redhat.com>2010-09-16 18:10:04 +0200
commitc8f9a8d3c0f9e5d47cc650bf0425926b03e8bbc6 (patch)
treeba79dcd0305b69d87009b9dc584f7cc5c844b4a2 /libbb/uuencode.c
parent9fe98f701d40835db32baa12c94b661d40231ea4 (diff)
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move read_base64 to libbb/uuencode.c
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Diffstat (limited to 'libbb/uuencode.c')
-rw-r--r--libbb/uuencode.c76
1 files changed, 75 insertions, 1 deletions
diff --git a/libbb/uuencode.c b/libbb/uuencode.c
index 181f49de0..03e708fd5 100644
--- a/libbb/uuencode.c
+++ b/libbb/uuencode.c
@@ -1,6 +1,8 @@
1/* vi: set sw=4 ts=4: */ 1/* vi: set sw=4 ts=4: */
2/* 2/*
3 * Copyright 2006 Rob Landley <rob@landley.net> 3 * Copyright 2003, Glenn McGrath
4 * Copyright 2006, Rob Landley <rob@landley.net>
5 * Copyright 2010, Denys Vlasenko
4 * 6 *
5 * Licensed under GPLv2 or later, see file LICENSE in this source tree. 7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
6 */ 8 */
@@ -69,3 +71,75 @@ void FAST_FUNC bb_uuencode(char *p, const void *src, int length, const char *tbl
69 length++; 71 length++;
70 } 72 }
71} 73}
74
75/*
76 * Decode base64 encoded stream.
77 * Can stop on EOF, specified char, or on uuencode-style "====" line:
78 * flags argument controls it.
79 */
80void FAST_FUNC read_base64(FILE *src_stream, FILE *dst_stream, int flags)
81{
82/* Note that EOF _can_ be passed as exit_char too */
83#define exit_char ((int)(signed char)flags)
84#define uu_style_end (flags & BASE64_FLAG_UU_STOP)
85
86 int term_count = 0;
87
88 while (1) {
89 unsigned char translated[4];
90 int count = 0;
91
92 /* Process one group of 4 chars */
93 while (count < 4) {
94 char *table_ptr;
95 int ch;
96
97 /* Get next _valid_ character.
98 * bb_uuenc_tbl_base64[] contains this string:
99 * 0 1 2 3 4 5 6
100 * 012345678901234567890123456789012345678901234567890123456789012345
101 * "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"
102 */
103 do {
104 ch = fgetc(src_stream);
105 if (ch == exit_char && count == 0)
106 return;
107 if (ch == EOF)
108 bb_error_msg_and_die("truncated base64 input");
109 table_ptr = strchr(bb_uuenc_tbl_base64, ch);
110//TODO: add BASE64_FLAG_foo to die on bad char?
111//Note that then we may need to still allow '\r' (for mail processing)
112 } while (!table_ptr);
113
114 /* Convert encoded character to decimal */
115 ch = table_ptr - bb_uuenc_tbl_base64;
116
117 if (ch == 65 /* '\n' */) {
118 /* Terminating "====" line? */
119 if (uu_style_end && term_count == 4)
120 return; /* yes */
121 term_count = 0;
122 continue;
123 }
124 /* ch is 64 if char was '=', otherwise 0..63 */
125 translated[count] = ch & 63; /* 64 -> 0 */
126 if (ch == 64) {
127 term_count++;
128 break;
129 }
130 count++;
131 term_count = 0;
132 }
133
134 /* Merge 6 bit chars to 8 bit.
135 * count can be < 4 when we decode the tail:
136 * "eQ==" -> "y", not "y NUL NUL"
137 */
138 if (count > 1)
139 fputc(translated[0] << 2 | translated[1] >> 4, dst_stream);
140 if (count > 2)
141 fputc(translated[1] << 4 | translated[2] >> 2, dst_stream);
142 if (count > 3)
143 fputc(translated[2] << 6 | translated[3], dst_stream);
144 } /* while (1) */
145}