[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Copyright 2003, Glenn McGrath
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| 4 | *
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| 5 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 6 | *
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| 7 | * Based on specification from
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| 8 | * http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html
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| 9 | *
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| 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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| 12 | */
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| 13 | #include "libbb.h"
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| 14 |
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| 15 | #if ENABLE_UUDECODE
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| 16 | static void FAST_FUNC read_stduu(FILE *src_stream, FILE *dst_stream, int flags UNUSED_PARAM)
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| 17 | {
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| 18 | char *line;
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| 19 |
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| 20 | while ((line = xmalloc_fgetline(src_stream)) != NULL) {
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| 21 | int encoded_len, str_len;
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| 22 | char *line_ptr, *dst;
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| 23 |
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| 24 | if (strcmp(line, "end") == 0) {
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| 25 | return; /* the only non-error exit */
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| 26 | }
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| 27 |
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| 28 | line_ptr = line;
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| 29 | while (*line_ptr) {
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| 30 | *line_ptr = (*line_ptr - 0x20) & 0x3f;
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| 31 | line_ptr++;
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| 32 | }
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| 33 | str_len = line_ptr - line;
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| 34 |
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| 35 | encoded_len = line[0] * 4 / 3;
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| 36 | /* Check that line is not too short. (we tolerate
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| 37 | * overly _long_ line to accomodate possible extra '`').
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| 38 | * Empty line case is also caught here. */
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| 39 | if (str_len <= encoded_len) {
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| 40 | break; /* go to bb_error_msg_and_die("short file"); */
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| 41 | }
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| 42 | if (encoded_len <= 0) {
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| 43 | /* Ignore the "`\n" line, why is it even in the encode file ? */
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| 44 | free(line);
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| 45 | continue;
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| 46 | }
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| 47 | if (encoded_len > 60) {
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| 48 | bb_error_msg_and_die("line too long");
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| 49 | }
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| 50 |
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| 51 | dst = line;
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| 52 | line_ptr = line + 1;
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| 53 | do {
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| 54 | /* Merge four 6 bit chars to three 8 bit chars */
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| 55 | *dst++ = line_ptr[0] << 2 | line_ptr[1] >> 4;
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| 56 | encoded_len--;
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| 57 | if (encoded_len == 0) {
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| 58 | break;
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| 59 | }
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| 60 |
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| 61 | *dst++ = line_ptr[1] << 4 | line_ptr[2] >> 2;
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| 62 | encoded_len--;
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| 63 | if (encoded_len == 0) {
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| 64 | break;
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| 65 | }
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| 66 |
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| 67 | *dst++ = line_ptr[2] << 6 | line_ptr[3];
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| 68 | line_ptr += 4;
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| 69 | encoded_len -= 2;
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| 70 | } while (encoded_len > 0);
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| 71 | fwrite(line, 1, dst - line, dst_stream);
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| 72 | free(line);
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| 73 | }
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| 74 | bb_error_msg_and_die("short file");
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| 75 | }
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| 76 | #endif
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| 77 |
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| 78 | #if ENABLE_UUDECODE
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| 79 | int uudecode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 80 | int uudecode_main(int argc UNUSED_PARAM, char **argv)
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| 81 | {
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| 82 | FILE *src_stream;
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| 83 | char *outname = NULL;
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| 84 | char *line;
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| 85 |
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| 86 | opt_complementary = "?1"; /* 1 argument max */
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| 87 | getopt32(argv, "o:", &outname);
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| 88 | argv += optind;
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| 89 |
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| 90 | if (!argv[0])
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| 91 | *--argv = (char*)"-";
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| 92 | src_stream = xfopen_stdin(argv[0]);
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| 93 |
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| 94 | /* Search for the start of the encoding */
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| 95 | while ((line = xmalloc_fgetline(src_stream)) != NULL) {
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| 96 | void FAST_FUNC (*decode_fn_ptr)(FILE *src, FILE *dst, int flags);
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| 97 | char *line_ptr;
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| 98 | FILE *dst_stream;
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| 99 | int mode;
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| 100 |
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| 101 | if (strncmp(line, "begin-base64 ", 13) == 0) {
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| 102 | line_ptr = line + 13;
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| 103 | decode_fn_ptr = read_base64;
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| 104 | } else if (strncmp(line, "begin ", 6) == 0) {
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| 105 | line_ptr = line + 6;
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| 106 | decode_fn_ptr = read_stduu;
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| 107 | } else {
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| 108 | free(line);
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| 109 | continue;
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| 110 | }
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| 111 |
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| 112 | /* begin line found. decode and exit */
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| 113 | mode = bb_strtou(line_ptr, NULL, 8);
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| 114 | if (outname == NULL) {
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| 115 | outname = strchr(line_ptr, ' ');
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| 116 | if ((outname == NULL) || (*outname == '\0')) {
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| 117 | break;
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| 118 | }
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| 119 | outname++;
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| 120 | }
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| 121 | dst_stream = stdout;
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| 122 | if (NOT_LONE_DASH(outname)) {
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| 123 | dst_stream = xfopen_for_write(outname);
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| 124 | fchmod(fileno(dst_stream), mode & (S_IRWXU | S_IRWXG | S_IRWXO));
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| 125 | }
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| 126 | free(line);
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| 127 | decode_fn_ptr(src_stream, dst_stream, /*flags:*/ BASE64_FLAG_UU_STOP + BASE64_FLAG_NO_STOP_CHAR);
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| 128 | /* fclose_if_not_stdin(src_stream); - redundant */
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| 129 | return EXIT_SUCCESS;
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| 130 | }
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| 131 | bb_error_msg_and_die("no 'begin' line");
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| 132 | }
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| 133 | #endif
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| 134 |
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| 135 | //applet:IF_BASE64(APPLET(base64, _BB_DIR_BIN, _BB_SUID_DROP))
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| 136 |
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| 137 | //kbuild:lib-$(CONFIG_BASE64) += uudecode.o
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| 138 |
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| 139 | //config:config BASE64
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| 140 | //config: bool "base64"
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| 141 | //config: default y
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| 142 | //config: help
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| 143 | //config: Base64 encode and decode
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| 144 |
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| 145 | //usage:#define base64_trivial_usage
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| 146 | //usage: "[-d] [FILE]"
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| 147 | //usage:#define base64_full_usage "\n\n"
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| 148 | //usage: "Base64 encode or decode FILE to standard output"
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| 149 | //usage: "\nOptions:"
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| 150 | //usage: "\n -d Decode data"
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| 151 | ////usage: "\n -w COL Wrap lines at COL (default 76, 0 disables)"
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| 152 | ////usage: "\n -i When decoding, ignore non-alphabet characters"
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| 153 |
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| 154 | #if ENABLE_BASE64
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| 155 | int base64_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 156 | int base64_main(int argc UNUSED_PARAM, char **argv)
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| 157 | {
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| 158 | FILE *src_stream;
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| 159 | unsigned opts;
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| 160 |
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| 161 | opt_complementary = "?1"; /* 1 argument max */
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| 162 | opts = getopt32(argv, "d");
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| 163 | argv += optind;
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| 164 |
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| 165 | if (!argv[0])
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| 166 | *--argv = (char*)"-";
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| 167 | src_stream = xfopen_stdin(argv[0]);
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| 168 | if (opts) {
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| 169 | read_base64(src_stream, stdout, /*flags:*/ (char)EOF);
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| 170 | } else {
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| 171 | enum {
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| 172 | SRC_BUF_SIZE = 76/4*3, /* This *MUST* be a multiple of 3 */
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| 173 | DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
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| 174 | };
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| 175 | char src_buf[SRC_BUF_SIZE];
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| 176 | char dst_buf[DST_BUF_SIZE + 1];
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| 177 | int src_fd = fileno(src_stream);
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| 178 | while (1) {
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| 179 | size_t size = full_read(src_fd, src_buf, SRC_BUF_SIZE);
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| 180 | if (!size)
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| 181 | break;
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| 182 | if ((ssize_t)size < 0)
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| 183 | bb_perror_msg_and_die(bb_msg_read_error);
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| 184 | /* Encode the buffer we just read in */
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| 185 | bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
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| 186 | xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3));
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| 187 | bb_putchar('\n');
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| 188 | fflush(stdout);
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| 189 | }
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| 190 | }
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| 191 |
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| 192 | fflush_stdout_and_exit(EXIT_SUCCESS);
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| 193 | }
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| 194 | #endif
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| 195 |
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| 196 | /* Test script.
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| 197 | Put this into an empty dir with busybox binary, an run.
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| 198 |
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| 199 | #!/bin/sh
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| 200 | test -x busybox || { echo "No ./busybox?"; exit; }
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| 201 | ln -sf busybox uudecode
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| 202 | ln -sf busybox uuencode
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| 203 | >A_null
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| 204 | echo -n A >A
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| 205 | echo -n AB >AB
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| 206 | echo -n ABC >ABC
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| 207 | echo -n ABCD >ABCD
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| 208 | echo -n ABCDE >ABCDE
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| 209 | echo -n ABCDEF >ABCDEF
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| 210 | cat busybox >A_bbox
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| 211 | for f in A*; do
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| 212 | echo uuencode $f
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| 213 | ./uuencode $f <$f >u_$f
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| 214 | ./uuencode -m $f <$f >m_$f
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| 215 | done
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| 216 | mkdir unpk_u unpk_m 2>/dev/null
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| 217 | for f in u_*; do
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| 218 | ./uudecode <$f -o unpk_u/${f:2}
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| 219 | diff -a ${f:2} unpk_u/${f:2} >/dev/null 2>&1
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| 220 | echo uudecode $f: $?
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| 221 | done
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| 222 | for f in m_*; do
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| 223 | ./uudecode <$f -o unpk_m/${f:2}
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| 224 | diff -a ${f:2} unpk_m/${f:2} >/dev/null 2>&1
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| 225 | echo uudecode $f: $?
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| 226 | done
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| 227 | */
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