[1765] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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[2725] | 3 | * Copyright 2003, Glenn McGrath
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[821] | 4 | *
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[2725] | 5 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 6 | *
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[2725] | 7 | * Based on specification from
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| 8 | * http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html
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[821] | 9 | *
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[2725] | 10 | * Bugs: the spec doesn't mention anything about "`\n`\n" prior to the
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| 11 | * "end" line
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[821] | 12 | */
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[3232] | 13 |
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| 14 | //usage:#define uudecode_trivial_usage
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| 15 | //usage: "[-o OUTFILE] [INFILE]"
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| 16 | //usage:#define uudecode_full_usage "\n\n"
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| 17 | //usage: "Uudecode a file\n"
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| 18 | //usage: "Finds OUTFILE in uuencoded source unless -o is given"
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| 19 | //usage:
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| 20 | //usage:#define uudecode_example_usage
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| 21 | //usage: "$ uudecode -o busybox busybox.uu\n"
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| 22 | //usage: "$ ls -l busybox\n"
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| 23 | //usage: "-rwxr-xr-x 1 ams ams 245264 Jun 7 21:35 busybox\n"
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| 24 |
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[1765] | 25 | #include "libbb.h"
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[821] | 26 |
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[2725] | 27 | #if ENABLE_UUDECODE
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| 28 | static void FAST_FUNC read_stduu(FILE *src_stream, FILE *dst_stream, int flags UNUSED_PARAM)
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[821] | 29 | {
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| 30 | char *line;
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| 31 |
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[2725] | 32 | while ((line = xmalloc_fgetline(src_stream)) != NULL) {
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| 33 | int encoded_len, str_len;
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| 34 | char *line_ptr, *dst;
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[821] | 35 |
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| 36 | if (strcmp(line, "end") == 0) {
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[2725] | 37 | return; /* the only non-error exit */
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[821] | 38 | }
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| 39 |
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[2725] | 40 | line_ptr = line;
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| 41 | while (*line_ptr) {
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| 42 | *line_ptr = (*line_ptr - 0x20) & 0x3f;
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| 43 | line_ptr++;
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| 44 | }
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| 45 | str_len = line_ptr - line;
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| 46 |
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| 47 | encoded_len = line[0] * 4 / 3;
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| 48 | /* Check that line is not too short. (we tolerate
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| 49 | * overly _long_ line to accomodate possible extra '`').
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| 50 | * Empty line case is also caught here. */
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| 51 | if (str_len <= encoded_len) {
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| 52 | break; /* go to bb_error_msg_and_die("short file"); */
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| 53 | }
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| 54 | if (encoded_len <= 0) {
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[821] | 55 | /* Ignore the "`\n" line, why is it even in the encode file ? */
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[2725] | 56 | free(line);
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[821] | 57 | continue;
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| 58 | }
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[2725] | 59 | if (encoded_len > 60) {
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[1765] | 60 | bb_error_msg_and_die("line too long");
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[821] | 61 | }
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| 62 |
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[2725] | 63 | dst = line;
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| 64 | line_ptr = line + 1;
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| 65 | do {
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[821] | 66 | /* Merge four 6 bit chars to three 8 bit chars */
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[2725] | 67 | *dst++ = line_ptr[0] << 2 | line_ptr[1] >> 4;
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| 68 | encoded_len--;
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| 69 | if (encoded_len == 0) {
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[821] | 70 | break;
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| 71 | }
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| 72 |
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[2725] | 73 | *dst++ = line_ptr[1] << 4 | line_ptr[2] >> 2;
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| 74 | encoded_len--;
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| 75 | if (encoded_len == 0) {
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[821] | 76 | break;
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| 77 | }
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| 78 |
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[2725] | 79 | *dst++ = line_ptr[2] << 6 | line_ptr[3];
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| 80 | line_ptr += 4;
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| 81 | encoded_len -= 2;
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| 82 | } while (encoded_len > 0);
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| 83 | fwrite(line, 1, dst - line, dst_stream);
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[821] | 84 | free(line);
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| 85 | }
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[1765] | 86 | bb_error_msg_and_die("short file");
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[821] | 87 | }
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[2725] | 88 | #endif
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[821] | 89 |
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[2725] | 90 | #if ENABLE_UUDECODE
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| 91 | int uudecode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 92 | int uudecode_main(int argc UNUSED_PARAM, char **argv)
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[821] | 93 | {
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[2725] | 94 | FILE *src_stream;
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[821] | 95 | char *outname = NULL;
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| 96 | char *line;
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| 97 |
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[1765] | 98 | opt_complementary = "?1"; /* 1 argument max */
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| 99 | getopt32(argv, "o:", &outname);
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| 100 | argv += optind;
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[821] | 101 |
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[2725] | 102 | if (!argv[0])
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| 103 | *--argv = (char*)"-";
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| 104 | src_stream = xfopen_stdin(argv[0]);
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[821] | 105 |
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| 106 | /* Search for the start of the encoding */
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[2725] | 107 | while ((line = xmalloc_fgetline(src_stream)) != NULL) {
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| 108 | void FAST_FUNC (*decode_fn_ptr)(FILE *src, FILE *dst, int flags);
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[1765] | 109 | char *line_ptr;
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| 110 | FILE *dst_stream;
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| 111 | int mode;
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[821] | 112 |
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[1765] | 113 | if (strncmp(line, "begin-base64 ", 13) == 0) {
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[821] | 114 | line_ptr = line + 13;
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| 115 | decode_fn_ptr = read_base64;
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| 116 | } else if (strncmp(line, "begin ", 6) == 0) {
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| 117 | line_ptr = line + 6;
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| 118 | decode_fn_ptr = read_stduu;
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[1765] | 119 | } else {
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| 120 | free(line);
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| 121 | continue;
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[821] | 122 | }
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| 123 |
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[1765] | 124 | /* begin line found. decode and exit */
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[2725] | 125 | mode = bb_strtou(line_ptr, NULL, 8);
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[1765] | 126 | if (outname == NULL) {
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| 127 | outname = strchr(line_ptr, ' ');
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[3232] | 128 | if (!outname)
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[1765] | 129 | break;
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| 130 | outname++;
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[3232] | 131 | if (!outname[0])
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| 132 | break;
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[821] | 133 | }
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[1765] | 134 | dst_stream = stdout;
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| 135 | if (NOT_LONE_DASH(outname)) {
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[2725] | 136 | dst_stream = xfopen_for_write(outname);
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| 137 | fchmod(fileno(dst_stream), mode & (S_IRWXU | S_IRWXG | S_IRWXO));
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[1765] | 138 | }
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[821] | 139 | free(line);
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[2725] | 140 | decode_fn_ptr(src_stream, dst_stream, /*flags:*/ BASE64_FLAG_UU_STOP + BASE64_FLAG_NO_STOP_CHAR);
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[1765] | 141 | /* fclose_if_not_stdin(src_stream); - redundant */
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| 142 | return EXIT_SUCCESS;
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[821] | 143 | }
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[1765] | 144 | bb_error_msg_and_die("no 'begin' line");
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[821] | 145 | }
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[2725] | 146 | #endif
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[1765] | 147 |
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[3232] | 148 | //applet:IF_BASE64(APPLET(base64, BB_DIR_BIN, BB_SUID_DROP))
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[2725] | 149 |
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| 150 | //kbuild:lib-$(CONFIG_BASE64) += uudecode.o
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| 151 |
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| 152 | //config:config BASE64
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| 153 | //config: bool "base64"
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| 154 | //config: default y
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| 155 | //config: help
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| 156 | //config: Base64 encode and decode
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| 157 |
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| 158 | //usage:#define base64_trivial_usage
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| 159 | //usage: "[-d] [FILE]"
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| 160 | //usage:#define base64_full_usage "\n\n"
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| 161 | //usage: "Base64 encode or decode FILE to standard output"
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| 162 | //usage: "\n -d Decode data"
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| 163 | ////usage: "\n -w COL Wrap lines at COL (default 76, 0 disables)"
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| 164 | ////usage: "\n -i When decoding, ignore non-alphabet characters"
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| 165 |
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| 166 | #if ENABLE_BASE64
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| 167 | int base64_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 168 | int base64_main(int argc UNUSED_PARAM, char **argv)
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| 169 | {
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| 170 | FILE *src_stream;
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| 171 | unsigned opts;
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| 172 |
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| 173 | opt_complementary = "?1"; /* 1 argument max */
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| 174 | opts = getopt32(argv, "d");
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| 175 | argv += optind;
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| 176 |
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| 177 | if (!argv[0])
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| 178 | *--argv = (char*)"-";
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| 179 | src_stream = xfopen_stdin(argv[0]);
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| 180 | if (opts) {
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| 181 | read_base64(src_stream, stdout, /*flags:*/ (char)EOF);
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| 182 | } else {
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| 183 | enum {
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| 184 | SRC_BUF_SIZE = 76/4*3, /* This *MUST* be a multiple of 3 */
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| 185 | DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
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| 186 | };
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| 187 | char src_buf[SRC_BUF_SIZE];
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| 188 | char dst_buf[DST_BUF_SIZE + 1];
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| 189 | int src_fd = fileno(src_stream);
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| 190 | while (1) {
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| 191 | size_t size = full_read(src_fd, src_buf, SRC_BUF_SIZE);
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| 192 | if (!size)
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| 193 | break;
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| 194 | if ((ssize_t)size < 0)
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| 195 | bb_perror_msg_and_die(bb_msg_read_error);
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| 196 | /* Encode the buffer we just read in */
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| 197 | bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
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| 198 | xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3));
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| 199 | bb_putchar('\n');
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| 200 | fflush(stdout);
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| 201 | }
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| 202 | }
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| 203 |
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| 204 | fflush_stdout_and_exit(EXIT_SUCCESS);
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| 205 | }
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| 206 | #endif
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| 207 |
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[1765] | 208 | /* Test script.
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| 209 | Put this into an empty dir with busybox binary, an run.
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| 210 |
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| 211 | #!/bin/sh
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| 212 | test -x busybox || { echo "No ./busybox?"; exit; }
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| 213 | ln -sf busybox uudecode
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| 214 | ln -sf busybox uuencode
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| 215 | >A_null
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| 216 | echo -n A >A
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| 217 | echo -n AB >AB
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| 218 | echo -n ABC >ABC
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| 219 | echo -n ABCD >ABCD
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| 220 | echo -n ABCDE >ABCDE
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| 221 | echo -n ABCDEF >ABCDEF
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| 222 | cat busybox >A_bbox
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| 223 | for f in A*; do
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| 224 | echo uuencode $f
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| 225 | ./uuencode $f <$f >u_$f
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| 226 | ./uuencode -m $f <$f >m_$f
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| 227 | done
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| 228 | mkdir unpk_u unpk_m 2>/dev/null
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| 229 | for f in u_*; do
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| 230 | ./uudecode <$f -o unpk_u/${f:2}
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| 231 | diff -a ${f:2} unpk_u/${f:2} >/dev/null 2>&1
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| 232 | echo uudecode $f: $?
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| 233 | done
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| 234 | for f in m_*; do
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| 235 | ./uudecode <$f -o unpk_m/${f:2}
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| 236 | diff -a ${f:2} unpk_m/${f:2} >/dev/null 2>&1
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| 237 | echo uudecode $f: $?
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| 238 | done
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| 239 | */
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