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: Wez Furlong <wez@thebrainroom.com> |
16 +----------------------------------------------------------------------+
17 */
18
19 /* $Id$ */
20
21 /* Memory Mapping interface for streams */
22 #include "php.h"
23 #include "php_streams_int.h"
24
_php_stream_mmap_range(php_stream * stream,size_t offset,size_t length,php_stream_mmap_access_t mode,size_t * mapped_len)25 PHPAPI char *_php_stream_mmap_range(php_stream *stream, size_t offset, size_t length, php_stream_mmap_access_t mode, size_t *mapped_len)
26 {
27 php_stream_mmap_range range;
28
29 range.offset = offset;
30 range.length = length;
31 range.mode = mode;
32 range.mapped = NULL;
33
34 /* For now, we impose an arbitrary limit to avoid
35 * runaway swapping when large files are passed thru. */
36 if (length > 4 * 1024 * 1024) {
37 return NULL;
38 }
39
40 if (PHP_STREAM_OPTION_RETURN_OK == php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_MAP_RANGE, &range)) {
41 if (mapped_len) {
42 *mapped_len = range.length;
43 }
44 return range.mapped;
45 }
46 return NULL;
47 }
48
_php_stream_mmap_unmap(php_stream * stream)49 PHPAPI int _php_stream_mmap_unmap(php_stream *stream)
50 {
51 return php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_UNMAP, NULL) == PHP_STREAM_OPTION_RETURN_OK ? 1 : 0;
52 }
53
_php_stream_mmap_unmap_ex(php_stream * stream,zend_off_t readden)54 PHPAPI int _php_stream_mmap_unmap_ex(php_stream *stream, zend_off_t readden)
55 {
56 int ret = 1;
57
58 if (php_stream_seek(stream, readden, SEEK_CUR) != 0) {
59 ret = 0;
60 }
61 if (php_stream_mmap_unmap(stream) == 0) {
62 ret = 0;
63 }
64
65 return ret;
66 }
67
68 /*
69 * Local variables:
70 * tab-width: 4
71 * c-basic-offset: 4
72 * End:
73 * vim600: noet sw=4 ts=4 fdm=marker
74 * vim<600: noet sw=4 ts=4
75 */
76
