coreutils/uuencode.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Copyright (C) 2000 by Glenn McGrath
   4  *
   5  * based on the function base64_encode from http.c in wget v1.6
   6  * Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
   7  *
   8  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9  */
  10 //config:config UUENCODE
  11 //config:       bool "uuencode (4.7 kb)"
  12 //config:       default y
  13 //config:       help
  14 //config:       uuencode is used to uuencode a file.
  15
  16 //applet:IF_UUENCODE(APPLET(uuencode, BB_DIR_USR_BIN, BB_SUID_DROP))
  17
  18 //kbuild:lib-$(CONFIG_UUENCODE) += uuencode.o
  19
  20 //usage:#define uuencode_trivial_usage
  21 //usage:       "[-m] [FILE] STORED_FILENAME"
  22 //usage:#define uuencode_full_usage "\n\n"
  23 //usage:       "Uuencode FILE (or stdin) to stdout\n"
  24 //usage:     "\n        -m      Use base64 encoding per RFC1521"
  25 //usage:
  26 //usage:#define uuencode_example_usage
  27 //usage:       "$ uuencode busybox busybox\n"
  28 //usage:       "begin 755 busybox\n"
  29 //usage:       "<encoded file snipped>\n"
  30 //usage:       "$ uudecode busybox busybox > busybox.uu\n"
  31 //usage:       "$\n"
  32
  33 #include "libbb.h"
  34
  35 enum {
  36         SRC_BUF_SIZE = 15*3,  /* This *MUST* be a multiple of 3 */
  37         DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3),
  38 };
  39
  40 int uuencode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  41 int uuencode_main(int argc UNUSED_PARAM, char **argv)
  42 {
  43         struct stat stat_buf;
  44         int src_fd = STDIN_FILENO;
  45         const char *tbl;
  46         mode_t mode;
  47         char src_buf[SRC_BUF_SIZE];
  48         char dst_buf[DST_BUF_SIZE + 1];
  49
  50         tbl = bb_uuenc_tbl_std;
  51         mode = 0666 & ~umask(0666);
  52         if (getopt32(argv, "^" "m" "\0" "-1:?2"/*must have 1 or 2 args*/)) {
  53                 tbl = bb_uuenc_tbl_base64;
  54         }
  55         argv += optind;
  56         if (argv[1]) {
  57                 src_fd = xopen(argv[0], O_RDONLY);
  58                 fstat(src_fd, &stat_buf);
  59                 mode = stat_buf.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
  60                 argv++;
  61         }
  62
  63         printf("begin%s %o %s", tbl == bb_uuenc_tbl_std ? "" : "-base64", mode, *argv);
  64         while (1) {
  65                 size_t size = full_read(src_fd, src_buf, SRC_BUF_SIZE);
  66                 if (!size)
  67                         break;
  68                 if ((ssize_t)size < 0)
  69                         bb_simple_perror_msg_and_die(bb_msg_read_error);
  70                 /* Encode the buffer we just read in */
  71                 bb_uuencode(dst_buf, src_buf, size, tbl);
  72                 bb_putchar('\n');
  73                 if (tbl == bb_uuenc_tbl_std) {
  74                         bb_putchar(tbl[size]);
  75                 }
  76                 fflush(stdout);
  77                 xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3));
  78         }
  79         printf(tbl == bb_uuenc_tbl_std ? "\n`\nend\n" : "\n====\n");
  80
  81         fflush_stdout_and_exit_SUCCESS();
  82 }