266 lines
6.7 KiB
C
266 lines
6.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright 2003, Glenn McGrath
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*
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* Based on specification from
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* http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html
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*
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* Bugs: the spec doesn't mention anything about "`\n`\n" prior to the
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* "end" line
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*/
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//config:config UUDECODE
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//config: bool "uudecode (5.9 kb)"
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//config: default y
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//config: help
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//config: uudecode is used to decode a uuencoded file.
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//applet:IF_UUDECODE(APPLET(uudecode, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_UUDECODE) += uudecode.o
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//usage:#define uudecode_trivial_usage
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//usage: "[-o OUTFILE] [INFILE]"
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//usage:#define uudecode_full_usage "\n\n"
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//usage: "Uudecode a file\n"
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//usage: "Finds OUTFILE in uuencoded source unless -o is given"
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//usage:
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//usage:#define uudecode_example_usage
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//usage: "$ uudecode -o busybox busybox.uu\n"
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//usage: "$ ls -l busybox\n"
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//usage: "-rwxr-xr-x 1 ams ams 245264 Jun 7 21:35 busybox\n"
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#include "libbb.h"
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#if ENABLE_UUDECODE
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static void FAST_FUNC read_stduu(FILE *src_stream, FILE *dst_stream, int flags UNUSED_PARAM)
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{
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char *line;
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for (;;) {
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int encoded_len, str_len;
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char *line_ptr, *dst;
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size_t line_len;
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line_len = 64 * 1024;
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line = xmalloc_fgets_str_len(src_stream, "\n", &line_len);
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if (!line)
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break;
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/* Handle both Unix and MSDOS text.
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* Note: space should not be trimmed, some encoders use it instead of "`"
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* for padding of last incomplete 4-char block.
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*/
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str_len = line_len;
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while (--str_len >= 0
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&& (line[str_len] == '\n' || line[str_len] == '\r')
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) {
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line[str_len] = '\0';
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}
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if (strcmp(line, "end") == 0) {
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return; /* the only non-error exit */
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}
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line_ptr = line;
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while (*line_ptr) {
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*line_ptr = (*line_ptr - 0x20) & 0x3f;
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line_ptr++;
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}
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str_len = line_ptr - line;
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encoded_len = line[0] * 4 / 3;
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/* Check that line is not too short. (we tolerate
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* overly _long_ line to accommodate possible extra "`").
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* Empty line case is also caught here. */
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if (str_len <= encoded_len) {
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break; /* go to bb_error_msg_and_die("short file"); */
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}
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if (encoded_len <= 0) {
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/* Ignore the "`\n" line, why is it even in the encode file ? */
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free(line);
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continue;
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}
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if (encoded_len > 60) {
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bb_error_msg_and_die("line too long");
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}
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dst = line;
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line_ptr = line + 1;
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do {
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/* Merge four 6 bit chars to three 8 bit chars */
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*dst++ = line_ptr[0] << 2 | line_ptr[1] >> 4;
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encoded_len--;
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if (encoded_len == 0) {
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break;
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}
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*dst++ = line_ptr[1] << 4 | line_ptr[2] >> 2;
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encoded_len--;
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if (encoded_len == 0) {
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break;
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}
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*dst++ = line_ptr[2] << 6 | line_ptr[3];
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line_ptr += 4;
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encoded_len -= 2;
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} while (encoded_len > 0);
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fwrite(line, 1, dst - line, dst_stream);
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free(line);
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}
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bb_error_msg_and_die("short file");
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}
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#endif
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#if ENABLE_UUDECODE
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int uudecode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int uudecode_main(int argc UNUSED_PARAM, char **argv)
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{
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FILE *src_stream;
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char *outname = NULL;
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char *line;
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opt_complementary = "?1"; /* 1 argument max */
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getopt32(argv, "o:", &outname);
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argv += optind;
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if (!argv[0])
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*--argv = (char*)"-";
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src_stream = xfopen_stdin(argv[0]);
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/* Search for the start of the encoding */
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while ((line = xmalloc_fgetline(src_stream)) != NULL) {
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void FAST_FUNC (*decode_fn_ptr)(FILE *src, FILE *dst, int flags);
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char *line_ptr;
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FILE *dst_stream;
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int mode;
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if (is_prefixed_with(line, "begin-base64 ")) {
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line_ptr = line + 13;
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decode_fn_ptr = read_base64;
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} else if (is_prefixed_with(line, "begin ")) {
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line_ptr = line + 6;
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decode_fn_ptr = read_stduu;
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} else {
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free(line);
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continue;
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}
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/* begin line found. decode and exit */
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mode = bb_strtou(line_ptr, NULL, 8);
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if (outname == NULL) {
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outname = strchr(line_ptr, ' ');
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if (!outname)
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break;
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outname++;
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trim(outname); /* remove trailing space (and '\r' for DOS text) */
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if (!outname[0])
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break;
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}
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dst_stream = stdout;
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if (NOT_LONE_DASH(outname)) {
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dst_stream = xfopen_for_write(outname);
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fchmod(fileno(dst_stream), mode & (S_IRWXU | S_IRWXG | S_IRWXO));
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}
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free(line);
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decode_fn_ptr(src_stream, dst_stream, /*flags:*/ BASE64_FLAG_UU_STOP + BASE64_FLAG_NO_STOP_CHAR);
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/* fclose_if_not_stdin(src_stream); - redundant */
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return EXIT_SUCCESS;
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}
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bb_error_msg_and_die("no 'begin' line");
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}
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#endif
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//applet:IF_BASE64(APPLET(base64, BB_DIR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_BASE64) += uudecode.o
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//config:config BASE64
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//config: bool "base64 (5 kb)"
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//config: default y
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//config: help
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//config: Base64 encode and decode
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//usage:#define base64_trivial_usage
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//usage: "[-d] [FILE]"
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//usage:#define base64_full_usage "\n\n"
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//usage: "Base64 encode or decode FILE to standard output"
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//usage: "\n -d Decode data"
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////usage: "\n -w COL Wrap lines at COL (default 76, 0 disables)"
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////usage: "\n -i When decoding, ignore non-alphabet characters"
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#if ENABLE_BASE64
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int base64_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int base64_main(int argc UNUSED_PARAM, char **argv)
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{
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FILE *src_stream;
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unsigned opts;
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opt_complementary = "?1"; /* 1 argument max */
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opts = getopt32(argv, "d");
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argv += optind;
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if (!argv[0])
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*--argv = (char*)"-";
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src_stream = xfopen_stdin(argv[0]);
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if (opts) {
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read_base64(src_stream, stdout, /*flags:*/ (char)EOF);
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} else {
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enum {
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SRC_BUF_SIZE = 76/4*3, /* This *MUST* be a multiple of 3 */
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DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
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};
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char src_buf[SRC_BUF_SIZE];
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char dst_buf[DST_BUF_SIZE + 1];
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int src_fd = fileno(src_stream);
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while (1) {
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size_t size = full_read(src_fd, src_buf, SRC_BUF_SIZE);
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if (!size)
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break;
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if ((ssize_t)size < 0)
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bb_perror_msg_and_die(bb_msg_read_error);
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/* Encode the buffer we just read in */
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bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64);
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xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3));
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bb_putchar('\n');
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fflush(stdout);
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}
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}
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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#endif
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/* Test script.
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Put this into an empty dir with busybox binary, an run.
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#!/bin/sh
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test -x busybox || { echo "No ./busybox?"; exit; }
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ln -sf busybox uudecode
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ln -sf busybox uuencode
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>A_null
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echo -n A >A
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echo -n AB >AB
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echo -n ABC >ABC
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echo -n ABCD >ABCD
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echo -n ABCDE >ABCDE
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echo -n ABCDEF >ABCDEF
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cat busybox >A_bbox
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for f in A*; do
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echo uuencode $f
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./uuencode $f <$f >u_$f
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./uuencode -m $f <$f >m_$f
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done
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mkdir unpk_u unpk_m 2>/dev/null
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for f in u_*; do
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./uudecode <$f -o unpk_u/${f:2}
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diff -a ${f:2} unpk_u/${f:2} >/dev/null 2>&1
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echo uudecode $f: $?
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done
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for f in m_*; do
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./uudecode <$f -o unpk_m/${f:2}
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diff -a ${f:2} unpk_m/${f:2} >/dev/null 2>&1
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echo uudecode $f: $?
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done
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*/
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