149 lines
4.4 KiB
C
149 lines
4.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright (C) 2000 by Glenn McGrath
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*
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* based on the function base64_encode from http.c in wget v1.6
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* Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "busybox.h"
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/* Conversion table. for base 64 */
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static const char tbl_base64[65] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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'w', 'x', 'y', 'z', '0', '1', '2', '3',
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'4', '5', '6', '7', '8', '9', '+', '/',
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'=' /* termination character */
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};
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static const char tbl_std[65] = {
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'`', '!', '"', '#', '$', '%', '&', '\'',
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'(', ')', '*', '+', ',', '-', '.', '/',
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', ':', ';', '<', '=', '>', '?',
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'@', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
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'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
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'X', 'Y', 'Z', '[', '\\', ']', '^', '_',
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'`' /* termination character */
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};
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/*
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* Encode the string S of length LENGTH to base64 format and place it
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* to STORE. STORE will be 0-terminated, and must point to a writable
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* buffer of at least 1+BASE64_LENGTH(length) bytes.
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* where BASE64_LENGTH(len) = (4 * ((LENGTH + 2) / 3))
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*/
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static void uuencode (const unsigned char *s, const char *store, const int length, const char *tbl)
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{
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int i;
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unsigned char *p = (unsigned char *)store;
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/* Transform the 3x8 bits to 4x6 bits, as required by base64. */
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for (i = 0; i < length; i += 3) {
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*p++ = tbl[s[0] >> 2];
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*p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
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*p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
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*p++ = tbl[s[2] & 0x3f];
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s += 3;
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}
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/* Pad the result if necessary... */
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if (i == length + 1) {
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*(p - 1) = tbl[64];
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}
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else if (i == length + 2) {
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*(p - 1) = *(p - 2) = tbl[64];
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}
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/* ...and zero-terminate it. */
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*p = '\0';
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}
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#define SRC_BUF_SIZE 45 // This *MUST* be a multiple of 3
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#define DST_BUF_SIZE 4 * ((SRC_BUF_SIZE + 2) / 3)
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int uuencode_main(int argc, char **argv)
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{
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const int src_buf_size = SRC_BUF_SIZE;
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const int dst_buf_size = DST_BUF_SIZE;
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int write_size = dst_buf_size;
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struct stat stat_buf;
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FILE *src_stream = stdin;
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const char *tbl;
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size_t size;
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mode_t mode;
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RESERVE_CONFIG_BUFFER(src_buf, SRC_BUF_SIZE + 1);
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RESERVE_CONFIG_BUFFER(dst_buf, DST_BUF_SIZE + 1);
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tbl = tbl_std;
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if (bb_getopt_ulflags(argc, argv, "m") & 1) {
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tbl = tbl_base64;
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}
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switch (argc - optind) {
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case 2:
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src_stream = bb_xfopen(argv[optind], "r");
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if (stat(argv[optind], &stat_buf) < 0) {
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bb_perror_msg_and_die("stat");
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}
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mode = stat_buf.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
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if (src_stream == stdout) {
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puts("NULL");
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}
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break;
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case 1:
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mode = 0666 & ~umask(0666);
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break;
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default:
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bb_show_usage();
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}
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bb_printf("begin%s %o %s", tbl == tbl_std ? "" : "-base64", mode, argv[argc - 1]);
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while ((size = fread(src_buf, 1, src_buf_size, src_stream)) > 0) {
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if (size != src_buf_size) {
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/* write_size is always 60 until the last line */
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write_size=(4 * ((size + 2) / 3));
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/* pad with 0s so we can just encode extra bits */
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memset(&src_buf[size], 0, src_buf_size - size);
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}
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/* Encode the buffer we just read in */
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uuencode(src_buf, dst_buf, size, tbl);
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putchar('\n');
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if (tbl == tbl_std) {
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putchar(tbl[size]);
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}
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if (fwrite(dst_buf, 1, write_size, stdout) != write_size) {
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bb_perror_msg_and_die(bb_msg_write_error);
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}
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}
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bb_printf(tbl == tbl_std ? "\n`\nend\n" : "\n====\n");
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bb_xferror(src_stream, "source"); /* TODO - Fix this! */
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bb_fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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