[821] | 1 | /*
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| 2 | * Copyright 2003, Glenn McGrath <bug1@iinet.net.au>
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| 3 | *
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| 4 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 5 | *
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| 6 | * Based on specification from
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| 7 | * http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html
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| 8 | *
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| 9 | * Bugs: the spec doesn't mention anything about "`\n`\n" prior to the
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| 10 | * "end" line
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| 11 | */
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| 12 |
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| 13 |
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| 14 | #include <stdio.h>
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| 15 | #include <errno.h>
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| 16 | #include <getopt.h> /* optind */
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| 17 | #include <string.h>
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| 18 | #include <stdlib.h>
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| 19 | #include "busybox.h"
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| 20 |
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| 21 | static int read_stduu(FILE *src_stream, FILE *dst_stream)
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| 22 | {
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| 23 | char *line;
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| 24 |
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| 25 | while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) {
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| 26 | int length;
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| 27 | char *line_ptr = line;
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| 28 |
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| 29 | if (strcmp(line, "end") == 0) {
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| 30 | return(EXIT_SUCCESS);
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| 31 | }
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| 32 | length = ((*line_ptr - 0x20) & 0x3f)* 4 / 3;
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| 33 |
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| 34 | if (length <= 0) {
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| 35 | /* Ignore the "`\n" line, why is it even in the encode file ? */
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| 36 | continue;
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| 37 | }
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| 38 | if (length > 60) {
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| 39 | bb_error_msg_and_die("Line too long");
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| 40 | }
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| 41 |
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| 42 | line_ptr++;
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| 43 | /* Tolerate an overly long line to acomadate a possible exta '`' */
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| 44 | if (strlen(line_ptr) < (size_t)length) {
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| 45 | bb_error_msg_and_die("Short file");
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| 46 | }
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| 47 |
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| 48 | while (length > 0) {
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| 49 | /* Merge four 6 bit chars to three 8 bit chars */
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| 50 | fputc(((line_ptr[0] - 0x20) & 077) << 2 | ((line_ptr[1] - 0x20) & 077) >> 4, dst_stream);
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| 51 | line_ptr++;
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| 52 | length--;
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| 53 | if (length == 0) {
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| 54 | break;
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| 55 | }
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| 56 |
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| 57 | fputc(((line_ptr[0] - 0x20) & 077) << 4 | ((line_ptr[1] - 0x20) & 077) >> 2, dst_stream);
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| 58 | line_ptr++;
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| 59 | length--;
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| 60 | if (length == 0) {
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| 61 | break;
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| 62 | }
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| 63 |
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| 64 | fputc(((line_ptr[0] - 0x20) & 077) << 6 | ((line_ptr[1] - 0x20) & 077), dst_stream);
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| 65 | line_ptr += 2;
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| 66 | length -= 2;
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| 67 | }
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| 68 | free(line);
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| 69 | }
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| 70 | bb_error_msg_and_die("Short file");
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| 71 | }
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| 72 |
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| 73 | static int read_base64(FILE *src_stream, FILE *dst_stream)
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| 74 | {
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| 75 | static const char base64_table[] =
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| 76 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n";
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| 77 | char term_count = 0;
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| 78 |
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| 79 | while (1) {
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| 80 | char translated[4];
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| 81 | int count = 0;
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| 82 |
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| 83 | while (count < 4) {
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| 84 | char *table_ptr;
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| 85 | int ch;
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| 86 |
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| 87 | /* Get next _valid_ character */
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| 88 | do {
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| 89 | ch = fgetc(src_stream);
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| 90 | if (ch == EOF) {
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| 91 | bb_error_msg_and_die("Short file");
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| 92 | }
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| 93 | } while ((table_ptr = strchr(base64_table, ch)) == NULL);
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| 94 |
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| 95 | /* Convert encoded charcter to decimal */
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| 96 | ch = table_ptr - base64_table;
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| 97 |
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| 98 | if (*table_ptr == '=') {
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| 99 | if (term_count == 0) {
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| 100 | translated[count] = 0;
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| 101 | break;
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| 102 | }
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| 103 | term_count++;
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| 104 | }
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| 105 | else if (*table_ptr == '\n') {
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| 106 | /* Check for terminating line */
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| 107 | if (term_count == 5) {
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| 108 | return(EXIT_SUCCESS);
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| 109 | }
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| 110 | term_count = 1;
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| 111 | continue;
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| 112 | } else {
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| 113 | translated[count] = ch;
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| 114 | count++;
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| 115 | term_count = 0;
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| 116 | }
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| 117 | }
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| 118 |
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| 119 | /* Merge 6 bit chars to 8 bit */
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| 120 | fputc(translated[0] << 2 | translated[1] >> 4, dst_stream);
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| 121 | if (count > 2) {
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| 122 | fputc(translated[1] << 4 | translated[2] >> 2, dst_stream);
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| 123 | }
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| 124 | if (count > 3) {
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| 125 | fputc(translated[2] << 6 | translated[3], dst_stream);
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| 126 | }
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| 127 | }
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| 128 | }
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| 129 |
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| 130 | int uudecode_main(int argc, char **argv)
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| 131 | {
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| 132 | int (*decode_fn_ptr) (FILE * src, FILE * dst);
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| 133 | FILE *src_stream;
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| 134 | char *outname = NULL;
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| 135 | char *line;
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| 136 | int opt;
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| 137 |
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| 138 | opt = bb_getopt_ulflags(argc, argv, "o:", &outname);
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| 139 |
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| 140 | if (optind == argc) {
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| 141 | src_stream = stdin;
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| 142 | } else if (optind + 1 == argc) {
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| 143 | src_stream = bb_xfopen(argv[optind], "r");
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| 144 | } else {
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| 145 | bb_show_usage();
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| 146 | }
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| 147 |
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| 148 | /* Search for the start of the encoding */
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| 149 | while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) {
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| 150 | char *line_ptr = NULL;
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| 151 |
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| 152 | if (line == NULL) {
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| 153 | break;
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| 154 | } else if (strncmp(line, "begin-base64 ", 13) == 0) {
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| 155 | line_ptr = line + 13;
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| 156 | decode_fn_ptr = read_base64;
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| 157 | } else if (strncmp(line, "begin ", 6) == 0) {
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| 158 | line_ptr = line + 6;
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| 159 | decode_fn_ptr = read_stduu;
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| 160 | }
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| 161 |
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| 162 | if (line_ptr) {
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| 163 | FILE *dst_stream;
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| 164 | int mode;
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| 165 | int ret;
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| 166 |
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| 167 | mode = strtoul(line_ptr, NULL, 8);
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| 168 | if (outname == NULL) {
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| 169 | outname = strchr(line_ptr, ' ');
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| 170 | if ((outname == NULL) || (*outname == '\0')) {
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| 171 | break;
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| 172 | }
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| 173 | outname++;
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| 174 | }
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| 175 | if (strcmp(outname, "-") == 0) {
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| 176 | dst_stream = stdout;
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| 177 | } else {
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| 178 | dst_stream = bb_xfopen(outname, "w");
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| 179 | chmod(outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO));
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| 180 | }
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| 181 | free(line);
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| 182 | ret = decode_fn_ptr(src_stream, dst_stream);
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| 183 | bb_fclose_nonstdin(src_stream);
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| 184 | return(ret);
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| 185 | }
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| 186 | free(line);
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| 187 | }
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| 188 | bb_error_msg_and_die("No `begin' line");
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| 189 | }
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