diff options
Diffstat (limited to 'busybox/coreutils/uudecode.c')
| -rw-r--r-- | busybox/coreutils/uudecode.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/busybox/coreutils/uudecode.c b/busybox/coreutils/uudecode.c new file mode 100644 index 0000000..57d4e83 --- /dev/null +++ b/busybox/coreutils/uudecode.c @@ -0,0 +1,201 @@ +/* + * GPLv2 + * Copyright 2003, Glenn McGrath <bug1@iinet.net.au> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation; either version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Based on specification from + * http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html + * + * Bugs: the spec doesnt mention anything about "`\n`\n" prior to the "end" line + */ + + +#include <stdio.h> +#include <errno.h> +#include <getopt.h> +#include <string.h> +#include <stdlib.h> + +#include "libbb.h" + +static int read_stduu(FILE *src_stream, FILE *dst_stream) +{ + char *line; + + while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) { + int length; + char *line_ptr = line; + + if (strcmp(line, "end") == 0) { + return(EXIT_SUCCESS); + } + length = ((*line_ptr - 0x20) & 0x3f)* 4 / 3; + + if (length <= 0) { + /* Ignore the "`\n" line, why is it even in the encode file ? */ + continue; + } + if (length > 60) { + bb_error_msg_and_die("Line too long"); + } + + line_ptr++; + /* Tolerate an overly long line to acomadate a possible exta '`' */ + if (strlen(line_ptr) < length) { + bb_error_msg_and_die("Short file"); + } + + while (length > 0) { + /* Merge four 6 bit chars to three 8 bit chars */ + fputc(((line_ptr[0] - 0x20) & 077) << 2 | ((line_ptr[1] - 0x20) & 077) >> 4, dst_stream); + line_ptr++; + length--; + if (length == 0) { + break; + } + + fputc(((line_ptr[0] - 0x20) & 077) << 4 | ((line_ptr[1] - 0x20) & 077) >> 2, dst_stream); + line_ptr++; + length--; + if (length == 0) { + break; + } + + fputc(((line_ptr[0] - 0x20) & 077) << 6 | ((line_ptr[1] - 0x20) & 077), dst_stream); + line_ptr += 2; + length -= 2; + } + free(line); + } + bb_error_msg_and_die("Short file"); +} + +static int read_base64(FILE *src_stream, FILE *dst_stream) +{ + const char *base64_table = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"; + char term_count = 0; + + while (1) { + char translated[4]; + int count = 0; + + while (count < 4) { + char *table_ptr; + char ch; + + /* Get next _valid_ character */ + do { + ch = fgetc(src_stream); + if (ch == EOF) { + bb_error_msg_and_die("Short file"); + } + } while ((table_ptr = strchr(base64_table, ch)) == NULL); + + /* Convert encoded charcter to decimal */ + ch = table_ptr - base64_table; + + if (*table_ptr == '=') { + if (term_count == 0) { + translated[count] = 0; + break; + } + term_count++; + } + else if (*table_ptr == '\n') { + /* Check for terminating line */ + if (term_count == 5) { + return(EXIT_SUCCESS); + } + term_count = 1; + continue; + } else { + translated[count] = ch; + count++; + term_count = 0; + } + } + + /* Merge 6 bit chars to 8 bit */ + fputc(translated[0] << 2 | translated[1] >> 4, dst_stream); + if (count > 2) { + fputc(translated[1] << 4 | translated[2] >> 2, dst_stream); + } + if (count > 3) { + fputc(translated[2] << 6 | translated[3], dst_stream); + } + } +} + +extern int uudecode_main(int argc, char **argv) +{ + int (*decode_fn_ptr) (FILE * src, FILE * dst); + FILE *src_stream; + char *outname = NULL; + char *line; + int opt; + + opt = bb_getopt_ulflags(argc, argv, "o:", &outname); + + if (optind == argc) { + src_stream = stdin; + } else if (optind + 1 == argc) { + src_stream = bb_xfopen(argv[optind], "r"); + } else { + bb_show_usage(); + } + + /* Search for the start of the encoding */ + while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) { + char *line_ptr = NULL; + + if (line == NULL) { + break; + } else if (strncmp(line, "begin-base64 ", 13) == 0) { + line_ptr = line + 13; + decode_fn_ptr = read_base64; + } else if (strncmp(line, "begin ", 6) == 0) { + line_ptr = line + 6; + decode_fn_ptr = read_stduu; + } + + if (line_ptr) { + FILE *dst_stream; + int mode; + int ret; + + mode = strtoul(line_ptr, NULL, 8); + if (outname == NULL) { + outname = strchr(line_ptr, ' '); + if ((outname == NULL) || (*outname == '\0')) { + break; + } + outname++; + } + if (strcmp(outname, "-") == 0) { + dst_stream = stdout; + } else { + dst_stream = bb_xfopen(outname, "w"); + chmod(outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO)); + } + free(line); + ret = decode_fn_ptr(src_stream, dst_stream); + bb_fclose_nonstdin(src_stream); + return(ret); + } + free(line); + } + bb_error_msg_and_die("No `begin' line"); +} |