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