LXR busybox/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 (4.4 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
  35enum {
  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
  40int uuencode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  41int 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(EXIT_SUCCESS);
  82}
  83