1 /*
2 +----------------------------------------------------------------------+
3 | Copyright (c) The PHP Group |
4 +----------------------------------------------------------------------+
5 | This source file is subject to version 3.01 of the PHP license, |
6 | that is bundled with this package in the file LICENSE, and is |
7 | available through the world-wide-web at the following url: |
8 | https://www.php.net/license/3_01.txt |
9 | If you did not receive a copy of the PHP license and are unable to |
10 | obtain it through the world-wide-web, please send a note to |
11 | license@php.net so we can mail you a copy immediately. |
12 +----------------------------------------------------------------------+
13 | Author: Kirill Maximov <kir@actimind.com> |
14 +----------------------------------------------------------------------+
15 */
16
17 #include <stdlib.h>
18
19 #ifdef HAVE_UNISTD_H
20 #include <unistd.h>
21 #endif
22 #include <string.h>
23 #include <errno.h>
24
25 #include "php.h"
26 #include "quot_print.h"
27
28 #include <stdio.h>
29
30 /*
31 * Converting HEX char to INT value
32 */
php_hex2int(int c)33 static char php_hex2int(int c) /* {{{ */
34 {
35 if (isdigit(c)) {
36 return c - '0';
37 }
38 else if (c >= 'A' && c <= 'F') {
39 return c - 'A' + 10;
40 }
41 else if (c >= 'a' && c <= 'f') {
42 return c - 'a' + 10;
43 }
44 else {
45 return -1;
46 }
47 }
48 /* }}} */
49
php_quot_print_decode(const unsigned char * str,size_t length,int replace_us_by_ws)50 PHPAPI zend_string *php_quot_print_decode(const unsigned char *str, size_t length, int replace_us_by_ws) /* {{{ */
51 {
52 size_t i;
53 unsigned const char *p1;
54 unsigned char *p2;
55 unsigned int h_nbl, l_nbl;
56
57 size_t decoded_len, buf_size;
58 zend_string *retval;
59
60 static unsigned int hexval_tbl[256] = {
61 64, 64, 64, 64, 64, 64, 64, 64, 64, 32, 16, 64, 64, 16, 64, 64,
62 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
63 32, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 64, 64, 64, 64, 64, 64,
65 64, 10, 11, 12, 13, 14, 15, 64, 64, 64, 64, 64, 64, 64, 64, 64,
66 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 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, 64, 64, 64, 64, 64, 64, 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 };
78
79 if (replace_us_by_ws) {
80 replace_us_by_ws = '_';
81 }
82
83 i = length, p1 = str; buf_size = length;
84
85 while (i > 1 && *p1 != '\0') {
86 if (*p1 == '=') {
87 buf_size -= 2;
88 p1++;
89 i--;
90 }
91 p1++;
92 i--;
93 }
94
95 retval = zend_string_alloc(buf_size, 0);
96 i = length; p1 = str; p2 = (unsigned char*)ZSTR_VAL(retval);
97 decoded_len = 0;
98
99 while (i > 0 && *p1 != '\0') {
100 if (*p1 == '=') {
101 i--, p1++;
102 if (i == 0 || *p1 == '\0') {
103 break;
104 }
105 h_nbl = hexval_tbl[*p1];
106 if (h_nbl < 16) {
107 /* next char should be a hexadecimal digit */
108 if ((--i) == 0 || (l_nbl = hexval_tbl[*(++p1)]) >= 16) {
109 efree(retval);
110 return NULL;
111 }
112 *(p2++) = (h_nbl << 4) | l_nbl, decoded_len++;
113 i--, p1++;
114 } else if (h_nbl < 64) {
115 /* soft line break */
116 while (h_nbl == 32) {
117 if (--i == 0 || (h_nbl = hexval_tbl[*(++p1)]) == 64) {
118 efree(retval);
119 return NULL;
120 }
121 }
122 if (p1[0] == '\r' && i >= 2 && p1[1] == '\n') {
123 i--, p1++;
124 }
125 i--, p1++;
126 } else {
127 efree(retval);
128 return NULL;
129 }
130 } else {
131 *(p2++) = (replace_us_by_ws == *p1 ? '\x20': *p1);
132 i--, p1++, decoded_len++;
133 }
134 }
135
136 *p2 = '\0';
137 ZSTR_LEN(retval) = decoded_len;
138 return retval;
139 }
140 /* }}} */
141
142 #define PHP_QPRINT_MAXL 75
143
php_quot_print_encode(const unsigned char * str,size_t length)144 PHPAPI zend_string *php_quot_print_encode(const unsigned char *str, size_t length) /* {{{ */
145 {
146 zend_ulong lp = 0;
147 unsigned char c, *d;
148 char *hex = "0123456789ABCDEF";
149 zend_string *ret;
150
151 ret = zend_string_safe_alloc(3, (length + (((3 * length)/(PHP_QPRINT_MAXL-9)) + 1)), 0, 0);
152 d = (unsigned char*)ZSTR_VAL(ret);
153
154 while (length--) {
155 if (((c = *str++) == '\015') && (*str == '\012') && length > 0) {
156 *d++ = '\015';
157 *d++ = *str++;
158 length--;
159 lp = 0;
160 } else {
161 if (iscntrl (c) || (c == 0x7f) || (c & 0x80) || (c == '=') || ((c == ' ') && (*str == '\015'))) {
162 if ((((lp+= 3) > PHP_QPRINT_MAXL) && (c <= 0x7f))
163 || ((c > 0x7f) && (c <= 0xdf) && ((lp + 3) > PHP_QPRINT_MAXL))
164 || ((c > 0xdf) && (c <= 0xef) && ((lp + 6) > PHP_QPRINT_MAXL))
165 || ((c > 0xef) && (c <= 0xf4) && ((lp + 9) > PHP_QPRINT_MAXL))) {
166 *d++ = '=';
167 *d++ = '\015';
168 *d++ = '\012';
169 lp = 3;
170 }
171 *d++ = '=';
172 *d++ = hex[c >> 4];
173 *d++ = hex[c & 0xf];
174 } else {
175 if ((++lp) > PHP_QPRINT_MAXL) {
176 *d++ = '=';
177 *d++ = '\015';
178 *d++ = '\012';
179 lp = 1;
180 }
181 *d++ = c;
182 }
183 }
184 }
185 *d = '\0';
186 ret = zend_string_truncate(ret, d - (unsigned char*)ZSTR_VAL(ret), 0);
187 return ret;
188 }
189 /* }}} */
190
191 /*
192 *
193 * Decoding Quoted-printable string.
194 *
195 */
196 /* {{{ Convert a quoted-printable string to an 8 bit string */
PHP_FUNCTION(quoted_printable_decode)197 PHP_FUNCTION(quoted_printable_decode)
198 {
199 zend_string *arg1;
200 char *str_in;
201 zend_string *str_out;
202 size_t i = 0, j = 0, k;
203
204 ZEND_PARSE_PARAMETERS_START(1, 1)
205 Z_PARAM_STR(arg1)
206 ZEND_PARSE_PARAMETERS_END();
207
208 if (ZSTR_LEN(arg1) == 0) {
209 /* shortcut */
210 RETURN_EMPTY_STRING();
211 }
212
213 str_in = ZSTR_VAL(arg1);
214 str_out = zend_string_alloc(ZSTR_LEN(arg1), 0);
215 while (str_in[i]) {
216 switch (str_in[i]) {
217 case '=':
218 if (str_in[i + 1] && str_in[i + 2] &&
219 isxdigit((int) str_in[i + 1]) &&
220 isxdigit((int) str_in[i + 2]))
221 {
222 ZSTR_VAL(str_out)[j++] = (php_hex2int((int) str_in[i + 1]) << 4)
223 + php_hex2int((int) str_in[i + 2]);
224 i += 3;
225 } else /* check for soft line break according to RFC 2045*/ {
226 k = 1;
227 while (str_in[i + k] && ((str_in[i + k] == 32) || (str_in[i + k] == 9))) {
228 /* Possibly, skip spaces/tabs at the end of line */
229 k++;
230 }
231 if (!str_in[i + k]) {
232 /* End of line reached */
233 i += k;
234 }
235 else if ((str_in[i + k] == 13) && (str_in[i + k + 1] == 10)) {
236 /* CRLF */
237 i += k + 2;
238 }
239 else if ((str_in[i + k] == 13) || (str_in[i + k] == 10)) {
240 /* CR or LF */
241 i += k + 1;
242 }
243 else {
244 ZSTR_VAL(str_out)[j++] = str_in[i++];
245 }
246 }
247 break;
248 default:
249 ZSTR_VAL(str_out)[j++] = str_in[i++];
250 }
251 }
252 ZSTR_VAL(str_out)[j] = '\0';
253 ZSTR_LEN(str_out) = j;
254
255 RETVAL_NEW_STR(str_out);
256 }
257 /* }}} */
258
259 /* {{{ */
PHP_FUNCTION(quoted_printable_encode)260 PHP_FUNCTION(quoted_printable_encode)
261 {
262 zend_string *str;
263 zend_string *new_str;
264
265 ZEND_PARSE_PARAMETERS_START(1, 1)
266 Z_PARAM_STR(str)
267 ZEND_PARSE_PARAMETERS_END();
268
269 if (!ZSTR_LEN(str)) {
270 RETURN_EMPTY_STRING();
271 }
272
273 new_str = php_quot_print_encode((unsigned char *)ZSTR_VAL(str), ZSTR_LEN(str));
274 RETURN_STR(new_str);
275 }
276 /* }}} */
277
