xref: /PHP-5.6/ext/standard/uuencode.c (revision 35a8ed2f)
1 /*
2    +----------------------------------------------------------------------+
3    | PHP Version 5                                                        |
4    +----------------------------------------------------------------------+
5    | Copyright (c) 1997-2016 The PHP Group                                |
6    +----------------------------------------------------------------------+
7    | This source file is subject to version 3.01 of the PHP license,      |
8    | that is bundled with this package in the file LICENSE, and is        |
9    | available through the world-wide-web at the following url:           |
10    | http://www.php.net/license/3_01.txt                                  |
11    | If you did not receive a copy of the PHP license and are unable to   |
12    | obtain it through the world-wide-web, please send a note to          |
13    | license@php.net so we can mail you a copy immediately.               |
14    +----------------------------------------------------------------------+
15    | Author: Ilia Alshanetsky <ilia@php.net>                              |
16    +----------------------------------------------------------------------+
17  */
18 
19 /* $Id$ */
20 
21 /*
22  * Portions of this code are based on Berkeley's uuencode/uudecode
23  * implementation.
24  *
25  * Copyright (c) 1983, 1993
26  *  The Regents of the University of California.  All rights reserved.
27  *
28  * Redistribution and use in source and binary forms, with or without
29  * modification, are permitted provided that the following conditions
30  * are met:
31  * 1. Redistributions of source code must retain the above copyright
32  *    notice, this list of conditions and the following disclaimer.
33  * 2. Redistributions in binary form must reproduce the above copyright
34  *    notice, this list of conditions and the following disclaimer in the
35  *    documentation and/or other materials provided with the distribution.
36  * 3. All advertising materials mentioning features or use of this software
37  *    must display the following acknowledgement:
38  *  This product includes software developed by the University of
39  *  California, Berkeley and its contributors.
40  * 4. Neither the name of the University nor the names of its contributors
41  *    may be used to endorse or promote products derived from this software
42  *    without specific prior written permission.
43  *
44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
54  * SUCH DAMAGE.
55  */
56 
57 #include <math.h>
58 
59 #include "php.h"
60 #include "php_uuencode.h"
61 
62 #define PHP_UU_ENC(c) ((c) ? ((c) & 077) + ' ' : '`')
63 #define PHP_UU_ENC_C2(c) PHP_UU_ENC(((*(c) << 4) & 060) | ((*((c) + 1) >> 4) & 017))
64 #define PHP_UU_ENC_C3(c) PHP_UU_ENC(((*(c + 1) << 2) & 074) | ((*((c) + 2) >> 6) & 03))
65 
66 #define PHP_UU_DEC(c) (((c) - ' ') & 077)
67 
php_uuencode(char * src,int src_len,char ** dest)68 PHPAPI int php_uuencode(char *src, int src_len, char **dest) /* {{{ */
69 {
70 	int len = 45;
71 	char *p, *s, *e, *ee;
72 
73 	/* encoded length is ~ 38% greater than the original */
74 	p = *dest = safe_emalloc((size_t) ceil(src_len * 1.38), 1, 46);
75 	s = src;
76 	e = src + src_len;
77 
78 	while ((s + 3) < e) {
79 		ee = s + len;
80 		if (ee > e) {
81 			ee = e;
82 			len = ee - s;
83 			if (len % 3) {
84 				ee = s + (int) (floor(len / 3) * 3);
85 			}
86 		}
87 		*p++ = PHP_UU_ENC(len);
88 
89 		while (s < ee) {
90 			*p++ = PHP_UU_ENC(*s >> 2);
91 			*p++ = PHP_UU_ENC_C2(s);
92 			*p++ = PHP_UU_ENC_C3(s);
93 			*p++ = PHP_UU_ENC(*(s + 2) & 077);
94 
95 			s += 3;
96 		}
97 
98 		if (len == 45) {
99 			*p++ = '\n';
100 		}
101 	}
102 
103 	if (s < e) {
104 		if (len == 45) {
105 			*p++ = PHP_UU_ENC(e - s);
106 			len = 0;
107 		}
108 
109 		*p++ = PHP_UU_ENC(*s >> 2);
110 		*p++ = PHP_UU_ENC_C2(s);
111 		*p++ = ((e - s) > 1) ? PHP_UU_ENC_C3(s) : PHP_UU_ENC('\0');
112 		*p++ = ((e - s) > 2) ? PHP_UU_ENC(*(s + 2) & 077) : PHP_UU_ENC('\0');
113 	}
114 
115 	if (len < 45) {
116 		*p++ = '\n';
117 	}
118 
119 	*p++ = PHP_UU_ENC('\0');
120 	*p++ = '\n';
121 	*p = '\0';
122 
123 	return (p - *dest);
124 }
125 /* }}} */
126 
php_uudecode(char * src,int src_len,char ** dest)127 PHPAPI int php_uudecode(char *src, int src_len, char **dest) /* {{{ */
128 {
129 	int len, total_len=0;
130 	char *s, *e, *p, *ee;
131 
132 	p = *dest = safe_emalloc((size_t) ceil(src_len * 0.75), 1, 1);
133 	s = src;
134 	e = src + src_len;
135 
136 	while (s < e) {
137 		if ((len = PHP_UU_DEC(*s++)) <= 0) {
138 			break;
139 		}
140 		/* sanity check */
141 		if (len > src_len) {
142 			goto err;
143 		}
144 
145 		total_len += len;
146 
147 		ee = s + (len == 45 ? 60 : (int) floor(len * 1.33));
148 		/* sanity check */
149 		if (ee > e) {
150 			goto err;
151 		}
152 
153 		while (s < ee) {
154 			if(s+4 > e) {
155 				goto err;
156 			}
157 			*p++ = PHP_UU_DEC(*s) << 2 | PHP_UU_DEC(*(s + 1)) >> 4;
158 			*p++ = PHP_UU_DEC(*(s + 1)) << 4 | PHP_UU_DEC(*(s + 2)) >> 2;
159 			*p++ = PHP_UU_DEC(*(s + 2)) << 6 | PHP_UU_DEC(*(s + 3));
160 			s += 4;
161 		}
162 
163 		if (len < 45) {
164 			break;
165 		}
166 
167 		/* skip \n */
168 		s++;
169 	}
170 
171 	if ((len = total_len) > (p - *dest)) {
172 		*p++ = PHP_UU_DEC(*s) << 2 | PHP_UU_DEC(*(s + 1)) >> 4;
173 		if (len > 1) {
174 			*p++ = PHP_UU_DEC(*(s + 1)) << 4 | PHP_UU_DEC(*(s + 2)) >> 2;
175 			if (len > 2) {
176 				*p++ = PHP_UU_DEC(*(s + 2)) << 6 | PHP_UU_DEC(*(s + 3));
177 			}
178 		}
179 	}
180 
181 	*(*dest + total_len) = '\0';
182 
183 	return total_len;
184 
185 err:
186 	efree(*dest);
187 	return -1;
188 }
189 /* }}} */
190 
191 /* {{{ proto string convert_uuencode(string data)
192    uuencode a string */
PHP_FUNCTION(convert_uuencode)193 PHP_FUNCTION(convert_uuencode)
194 {
195 	char *src, *dst;
196 	int src_len, dst_len;
197 
198 	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &src, &src_len) == FAILURE || src_len < 1) {
199 		RETURN_FALSE;
200 	}
201 
202 	dst_len = php_uuencode(src, src_len, &dst);
203 	if (dst_len < 0) {
204 		php_error_docref(NULL TSRMLS_CC, E_WARNING, "String too long, max length is %d", INT_MAX);
205 		efree(dst);
206 		RETURN_FALSE;
207 	}
208 
209 	RETURN_STRINGL(dst, dst_len, 0);
210 }
211 /* }}} */
212 
213 /* {{{ proto string convert_uudecode(string data)
214    decode a uuencoded string */
PHP_FUNCTION(convert_uudecode)215 PHP_FUNCTION(convert_uudecode)
216 {
217 	char *src, *dst;
218 	int src_len, dst_len;
219 
220 	if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &src, &src_len) == FAILURE || src_len < 1) {
221 		RETURN_FALSE;
222 	}
223 
224 	dst_len = php_uudecode(src, src_len, &dst);
225 	if (dst_len < 0) {
226 		php_error_docref(NULL TSRMLS_CC, E_WARNING, "The given parameter is not a valid uuencoded string");
227 		RETURN_FALSE;
228 	}
229 
230 	RETURN_STRINGL(dst, dst_len, 0);
231 }
232 /* }}} */
233 
234 /*
235  * Local variables:
236  * tab-width: 4
237  * c-basic-offset: 4
238  * End:
239  * vim600: noet sw=4 ts=4 fdm=marker
240  * vim<600: noet sw=4 ts=4
241  */
242