1 /*
2 +----------------------------------------------------------------------+
3 | PHP Version 7 |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 1997-2018 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: Kirill Maximov <kir@actimind.com> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id$ */
20
21 #include <stdlib.h>
22
23 #ifdef HAVE_UNISTD_H
24 #include <unistd.h>
25 #endif
26 #include <string.h>
27 #include <errno.h>
28
29 #include "php.h"
30 #include "quot_print.h"
31
32 #include <stdio.h>
33
34 /*
35 * Converting HEX char to INT value
36 */
php_hex2int(int c)37 static char php_hex2int(int c) /* {{{ */
38 {
39 if (isdigit(c)) {
40 return c - '0';
41 }
42 else if (c >= 'A' && c <= 'F') {
43 return c - 'A' + 10;
44 }
45 else if (c >= 'a' && c <= 'f') {
46 return c - 'a' + 10;
47 }
48 else {
49 return -1;
50 }
51 }
52 /* }}} */
53
php_quot_print_decode(const unsigned char * str,size_t length,int replace_us_by_ws)54 PHPAPI zend_string *php_quot_print_decode(const unsigned char *str, size_t length, int replace_us_by_ws) /* {{{ */
55 {
56 register size_t i;
57 register unsigned const char *p1;
58 register unsigned char *p2;
59 register unsigned int h_nbl, l_nbl;
60
61 size_t decoded_len, buf_size;
62 zend_string *retval;
63
64 static unsigned int hexval_tbl[256] = {
65 64, 64, 64, 64, 64, 64, 64, 64, 64, 32, 16, 64, 64, 16, 64, 64,
66 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
67 32, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
68 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 64, 64, 64, 64, 64, 64,
69 64, 10, 11, 12, 13, 14, 15, 64, 64, 64, 64, 64, 64, 64, 64, 64,
70 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
71 64, 10, 11, 12, 13, 14, 15, 64, 64, 64, 64, 64, 64, 64, 64, 64,
72 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
73 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
74 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
75 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
76 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
77 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
78 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
79 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
80 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
81 };
82
83 if (replace_us_by_ws) {
84 replace_us_by_ws = '_';
85 }
86
87 i = length, p1 = str; buf_size = length;
88
89 while (i > 1 && *p1 != '\0') {
90 if (*p1 == '=') {
91 buf_size -= 2;
92 p1++;
93 i--;
94 }
95 p1++;
96 i--;
97 }
98
99 retval = zend_string_alloc(buf_size, 0);
100 i = length; p1 = str; p2 = (unsigned char*)ZSTR_VAL(retval);
101 decoded_len = 0;
102
103 while (i > 0 && *p1 != '\0') {
104 if (*p1 == '=') {
105 i--, p1++;
106 if (i == 0 || *p1 == '\0') {
107 break;
108 }
109 h_nbl = hexval_tbl[*p1];
110 if (h_nbl < 16) {
111 /* next char should be a hexadecimal digit */
112 if ((--i) == 0 || (l_nbl = hexval_tbl[*(++p1)]) >= 16) {
113 efree(retval);
114 return NULL;
115 }
116 *(p2++) = (h_nbl << 4) | l_nbl, decoded_len++;
117 i--, p1++;
118 } else if (h_nbl < 64) {
119 /* soft line break */
120 while (h_nbl == 32) {
121 if (--i == 0 || (h_nbl = hexval_tbl[*(++p1)]) == 64) {
122 efree(retval);
123 return NULL;
124 }
125 }
126 if (p1[0] == '\r' && i >= 2 && p1[1] == '\n') {
127 i--, p1++;
128 }
129 i--, p1++;
130 } else {
131 efree(retval);
132 return NULL;
133 }
134 } else {
135 *(p2++) = (replace_us_by_ws == *p1 ? '\x20': *p1);
136 i--, p1++, decoded_len++;
137 }
138 }
139
140 *p2 = '\0';
141 ZSTR_LEN(retval) = decoded_len;
142 return retval;
143 }
144 /* }}} */
145
146 #define PHP_QPRINT_MAXL 75
147
php_quot_print_encode(const unsigned char * str,size_t length)148 PHPAPI zend_string *php_quot_print_encode(const unsigned char *str, size_t length) /* {{{ */
149 {
150 zend_ulong lp = 0;
151 unsigned char c, *d;
152 char *hex = "0123456789ABCDEF";
153 zend_string *ret;
154
155 ret = zend_string_safe_alloc(3, (length + (((3 * length)/(PHP_QPRINT_MAXL-9)) + 1)), 0, 0);
156 d = (unsigned char*)ZSTR_VAL(ret);
157
158 while (length--) {
159 if (((c = *str++) == '\015') && (*str == '\012') && length > 0) {
160 *d++ = '\015';
161 *d++ = *str++;
162 length--;
163 lp = 0;
164 } else {
165 if (iscntrl (c) || (c == 0x7f) || (c & 0x80) || (c == '=') || ((c == ' ') && (*str == '\015'))) {
166 if ((((lp+= 3) > PHP_QPRINT_MAXL) && (c <= 0x7f))
167 || ((c > 0x7f) && (c <= 0xdf) && ((lp + 3) > PHP_QPRINT_MAXL))
168 || ((c > 0xdf) && (c <= 0xef) && ((lp + 6) > PHP_QPRINT_MAXL))
169 || ((c > 0xef) && (c <= 0xf4) && ((lp + 9) > PHP_QPRINT_MAXL))) {
170 *d++ = '=';
171 *d++ = '\015';
172 *d++ = '\012';
173 lp = 3;
174 }
175 *d++ = '=';
176 *d++ = hex[c >> 4];
177 *d++ = hex[c & 0xf];
178 } else {
179 if ((++lp) > PHP_QPRINT_MAXL) {
180 *d++ = '=';
181 *d++ = '\015';
182 *d++ = '\012';
183 lp = 1;
184 }
185 *d++ = c;
186 }
187 }
188 }
189 *d = '\0';
190 ret = zend_string_truncate(ret, d - (unsigned char*)ZSTR_VAL(ret), 0);
191 return ret;
192 }
193 /* }}} */
194
195 /*
196 *
197 * Decoding Quoted-printable string.
198 *
199 */
200 /* {{{ proto string quoted_printable_decode(string str)
201 Convert a quoted-printable string to an 8 bit string */
PHP_FUNCTION(quoted_printable_decode)202 PHP_FUNCTION(quoted_printable_decode)
203 {
204 zend_string *arg1;
205 char *str_in;
206 zend_string *str_out;
207 size_t i = 0, j = 0, k;
208
209 if (zend_parse_parameters(ZEND_NUM_ARGS(), "S", &arg1) == FAILURE) {
210 return;
211 }
212
213 if (ZSTR_LEN(arg1) == 0) {
214 /* shortcut */
215 RETURN_EMPTY_STRING();
216 }
217
218 str_in = ZSTR_VAL(arg1);
219 str_out = zend_string_alloc(ZSTR_LEN(arg1), 0);
220 while (str_in[i]) {
221 switch (str_in[i]) {
222 case '=':
223 if (str_in[i + 1] && str_in[i + 2] &&
224 isxdigit((int) str_in[i + 1]) &&
225 isxdigit((int) str_in[i + 2]))
226 {
227 ZSTR_VAL(str_out)[j++] = (php_hex2int((int) str_in[i + 1]) << 4)
228 + php_hex2int((int) str_in[i + 2]);
229 i += 3;
230 } else /* check for soft line break according to RFC 2045*/ {
231 k = 1;
232 while (str_in[i + k] && ((str_in[i + k] == 32) || (str_in[i + k] == 9))) {
233 /* Possibly, skip spaces/tabs at the end of line */
234 k++;
235 }
236 if (!str_in[i + k]) {
237 /* End of line reached */
238 i += k;
239 }
240 else if ((str_in[i + k] == 13) && (str_in[i + k + 1] == 10)) {
241 /* CRLF */
242 i += k + 2;
243 }
244 else if ((str_in[i + k] == 13) || (str_in[i + k] == 10)) {
245 /* CR or LF */
246 i += k + 1;
247 }
248 else {
249 ZSTR_VAL(str_out)[j++] = str_in[i++];
250 }
251 }
252 break;
253 default:
254 ZSTR_VAL(str_out)[j++] = str_in[i++];
255 }
256 }
257 ZSTR_VAL(str_out)[j] = '\0';
258 ZSTR_LEN(str_out) = j;
259
260 RETVAL_NEW_STR(str_out);
261 }
262 /* }}} */
263
264 /* {{{ proto string quoted_printable_encode(string str) */
PHP_FUNCTION(quoted_printable_encode)265 PHP_FUNCTION(quoted_printable_encode)
266 {
267 zend_string *str;
268 zend_string *new_str;
269
270 if (zend_parse_parameters(ZEND_NUM_ARGS(), "S", &str) != SUCCESS) {
271 return;
272 }
273
274 if (!ZSTR_LEN(str)) {
275 RETURN_EMPTY_STRING();
276 }
277
278 new_str = php_quot_print_encode((unsigned char *)ZSTR_VAL(str), ZSTR_LEN(str));
279 RETURN_STR(new_str);
280 }
281 /* }}} */
282
283 /*
284 * Local variables:
285 * tab-width: 4
286 * c-basic-offset: 4
287 * End:
288 * vim600: sw=4 ts=4 fdm=marker
289 * vim<600: sw=4 ts=4
290 */
291
