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