| /* vi: set sw=4 ts=4: */ |
| /* |
| * Copyright 2003, Glenn McGrath |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
| * |
| * Based on specification from |
| * http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html |
| * |
| * Bugs: the spec doesn't mention anything about "`\n`\n" prior to the |
| * "end" line |
| */ |
| |
| |
| #include "libbb.h" |
| |
| static void read_stduu(FILE *src_stream, FILE *dst_stream) |
| { |
| char *line; |
| |
| while ((line = xmalloc_fgetline(src_stream)) != NULL) { |
| int encoded_len, str_len; |
| char *line_ptr, *dst; |
| |
| if (strcmp(line, "end") == 0) { |
| return; /* the only non-error exit */ |
| } |
| |
| line_ptr = line; |
| while (*line_ptr) { |
| *line_ptr = (*line_ptr - 0x20) & 0x3f; |
| line_ptr++; |
| } |
| str_len = line_ptr - line; |
| |
| encoded_len = line[0] * 4 / 3; |
| /* Check that line is not too short. (we tolerate |
| * overly _long_ line to accomodate possible extra '`'). |
| * Empty line case is also caught here. */ |
| if (str_len <= encoded_len) { |
| break; /* go to bb_error_msg_and_die("short file"); */ |
| } |
| if (encoded_len <= 0) { |
| /* Ignore the "`\n" line, why is it even in the encode file ? */ |
| free(line); |
| continue; |
| } |
| if (encoded_len > 60) { |
| bb_error_msg_and_die("line too long"); |
| } |
| |
| dst = line; |
| line_ptr = line + 1; |
| do { |
| /* Merge four 6 bit chars to three 8 bit chars */ |
| *dst++ = line_ptr[0] << 2 | line_ptr[1] >> 4; |
| encoded_len--; |
| if (encoded_len == 0) { |
| break; |
| } |
| |
| *dst++ = line_ptr[1] << 4 | line_ptr[2] >> 2; |
| encoded_len--; |
| if (encoded_len == 0) { |
| break; |
| } |
| |
| *dst++ = line_ptr[2] << 6 | line_ptr[3]; |
| line_ptr += 4; |
| encoded_len -= 2; |
| } while (encoded_len > 0); |
| fwrite(line, 1, dst - line, dst_stream); |
| free(line); |
| } |
| bb_error_msg_and_die("short file"); |
| } |
| |
| static void read_base64(FILE *src_stream, FILE *dst_stream) |
| { |
| int term_count = 1; |
| |
| while (1) { |
| char translated[4]; |
| int count = 0; |
| |
| while (count < 4) { |
| char *table_ptr; |
| int ch; |
| |
| /* Get next _valid_ character. |
| * global vector bb_uuenc_tbl_base64[] contains this string: |
| * "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n" |
| */ |
| do { |
| ch = fgetc(src_stream); |
| if (ch == EOF) { |
| bb_error_msg_and_die("short file"); |
| } |
| table_ptr = strchr(bb_uuenc_tbl_base64, ch); |
| } while (table_ptr == NULL); |
| |
| /* Convert encoded character to decimal */ |
| ch = table_ptr - bb_uuenc_tbl_base64; |
| |
| 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; |
| } |
| term_count = 1; |
| continue; |
| } else { |
| translated[count] = ch; |
| count++; |
| term_count = 0; |
| } |
| } |
| |
| /* Merge 6 bit chars to 8 bit */ |
| if (count > 1) { |
| 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); |
| } |
| } |
| } |
| |
| int uudecode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int uudecode_main(int argc UNUSED_PARAM, char **argv) |
| { |
| FILE *src_stream; |
| char *outname = NULL; |
| char *line; |
| |
| opt_complementary = "?1"; /* 1 argument max */ |
| getopt32(argv, "o:", &outname); |
| argv += optind; |
| |
| if (!*argv) |
| *--argv = (char*)"-"; |
| src_stream = xfopen_stdin(*argv); |
| |
| /* Search for the start of the encoding */ |
| while ((line = xmalloc_fgetline(src_stream)) != NULL) { |
| void (*decode_fn_ptr)(FILE *src, FILE *dst); |
| char *line_ptr; |
| FILE *dst_stream; |
| int mode; |
| |
| 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; |
| } else { |
| free(line); |
| continue; |
| } |
| |
| /* begin line found. decode and exit */ |
| mode = bb_strtou(line_ptr, NULL, 8); |
| if (outname == NULL) { |
| outname = strchr(line_ptr, ' '); |
| if ((outname == NULL) || (*outname == '\0')) { |
| break; |
| } |
| outname++; |
| } |
| dst_stream = stdout; |
| if (NOT_LONE_DASH(outname)) { |
| dst_stream = xfopen_for_write(outname); |
| fchmod(fileno(dst_stream), mode & (S_IRWXU | S_IRWXG | S_IRWXO)); |
| } |
| free(line); |
| decode_fn_ptr(src_stream, dst_stream); |
| /* fclose_if_not_stdin(src_stream); - redundant */ |
| return EXIT_SUCCESS; |
| } |
| bb_error_msg_and_die("no 'begin' line"); |
| } |
| |
| /* Test script. |
| Put this into an empty dir with busybox binary, an run. |
| |
| #!/bin/sh |
| test -x busybox || { echo "No ./busybox?"; exit; } |
| ln -sf busybox uudecode |
| ln -sf busybox uuencode |
| >A_null |
| echo -n A >A |
| echo -n AB >AB |
| echo -n ABC >ABC |
| echo -n ABCD >ABCD |
| echo -n ABCDE >ABCDE |
| echo -n ABCDEF >ABCDEF |
| cat busybox >A_bbox |
| for f in A*; do |
| echo uuencode $f |
| ./uuencode $f <$f >u_$f |
| ./uuencode -m $f <$f >m_$f |
| done |
| mkdir unpk_u unpk_m 2>/dev/null |
| for f in u_*; do |
| ./uudecode <$f -o unpk_u/${f:2} |
| diff -a ${f:2} unpk_u/${f:2} >/dev/null 2>&1 |
| echo uudecode $f: $? |
| done |
| for f in m_*; do |
| ./uudecode <$f -o unpk_m/${f:2} |
| diff -a ${f:2} unpk_m/${f:2} >/dev/null 2>&1 |
| echo uudecode $f: $? |
| done |
| */ |