uuencode.c

/*
   +----------------------------------------------------------------------+
   | PHP Version 4                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2003 The PHP Group                                |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.0 of the PHP license,       |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.php.net/license/3_0.txt.                                  |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Ilia Alshanetsky <ilia@php.net>                              |
   +----------------------------------------------------------------------+
 */

/* $Id$ */

/*
 * Portions of this code are based on Berkeley's uuencode/uudecode
 * implementation.
 *
 * Copyright (c) 1983, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *  This product includes software developed by the University of
 *  California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <math.h>

#include "php.h"
#include "php_uuencode.h"

#define PHP_UU_ENC(c) ((c) ? ((c) & 077) + ' ' : '`')
#define PHP_UU_ENC_C2(c) PHP_UU_ENC(((*(c) << 4) & 060) | ((*((c) + 1) >> 4) & 017))
#define PHP_UU_ENC_C3(c) PHP_UU_ENC(((*(c + 1) << 2) & 074) | ((*((c) + 2) >> 6) & 03))

#define PHP_UU_DEC(c) (((c) - ' ') & 077)

PHPAPI int php_uuencode(char *src, int src_len, char **dest)
{
	int len = 45;
	char *p, *s, *e, *ee;

	/* encoded length is ~ 38% greater then the original */
	p = *dest = emalloc((ceil(src_len * 1.38) + 45 + 1));
	s = src;
	e = src + src_len;

	while ((s + 3) < e) {
		ee = s + len;
		if (ee > e) {
			ee = e;
			len = ee - s;
			if (len % 3) {
				ee = s + (int) (floor(len / 3) * 3);
			}
		}
		*p++ = PHP_UU_ENC(len);

		while (s < ee) {
			*p++ = PHP_UU_ENC(*s >> 2);
			*p++ = PHP_UU_ENC_C2(s);
			*p++ = PHP_UU_ENC_C3(s);
			*p++ = PHP_UU_ENC(*(s + 2) & 077);

			s += 3;
		}

		if (len == 45) {
			*p++ = '\n';
		}
	}

	if (s < e) {
		if (len == 45) {
			*p++ = PHP_UU_ENC(e - s);
			len = 0;
		}

		*p++ = PHP_UU_ENC(*s >> 2);
		*p++ = PHP_UU_ENC_C2(s);
		*p++ = ((e - s) > 1) ? PHP_UU_ENC_C3(s) : PHP_UU_ENC('\0');
		*p++ = ((e - s) > 2) ? PHP_UU_ENC(*(s + 2) & 077) : PHP_UU_ENC('\0');
	}

	if (len < 45) {
		*p++ = '\n';
	}

	*p++ = PHP_UU_ENC('\0');
	*p++ = '\n';
	*p = '\0';

	return (p - *dest);
}

PHPAPI int php_uudecode(char *src, int src_len, char **dest)
{
	int len, total_len=0;
	char *s, *e, *p, *ee;

	p = *dest = emalloc(ceil(src_len * 0.75) + 1);
	s = src;
	e = src + src_len;

	while (s < e) {
		if ((len = PHP_UU_DEC(*s++)) <= 0) {
			break;
		}
		total_len += len;

		ee = s + (len == 45 ? 60 : (int) floor(len * 1.33));

		while (s < ee) {
			*p++ = PHP_UU_DEC(*s) << 2 | PHP_UU_DEC(*(s + 1)) >> 4;
			*p++ = PHP_UU_DEC(*(s + 1)) << 4 | PHP_UU_DEC(*(s + 2)) >> 2;
			*p++ = PHP_UU_DEC(*(s + 2)) << 6 | PHP_UU_DEC(*(s + 3));
			s += 4;
		}

		if (len < 45) {
			break;
		}

		/* skip \n */
		s++;
	}

	if ((len = total_len > (p - *dest))) {
		*p++ = PHP_UU_DEC(*s) << 2 | PHP_UU_DEC(*(s + 1)) >> 4;
		if (len > 1) {
			*p++ = PHP_UU_DEC(*(s + 1)) << 4 | PHP_UU_DEC(*(s + 2)) >> 2;
			if (len > 2) {
				*p++ = PHP_UU_DEC(*(s + 2)) << 6 | PHP_UU_DEC(*(s + 3));
			}
		}
	}

	*(*dest + total_len) = '\0';

	return total_len;
}

/* {{{ proto string uuencode(string data) 
   uuencode a string */
PHP_FUNCTION(convert_uuencode)
{
	char *src, *dst;
	int src_len, dst_len;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &src, &src_len) == FAILURE || src_len < 1) {
		RETURN_FALSE;
	}

	dst_len = php_uuencode(src, src_len, &dst);

	RETURN_STRINGL(dst, dst_len, 0);
}
/* }}} */

/* {{{ proto string uudecode(string data)
   decode a uuencoded string */
PHP_FUNCTION(convert_uudecode)
{
	char *src, *dst;
	int src_len, dst_len;

	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &src, &src_len) == FAILURE || src_len < 1) {
		RETURN_FALSE;
	}

	dst_len = php_uudecode(src, src_len, &dst);

	RETURN_STRINGL(dst, dst_len, 0);
}
/* }}} */