mmap.c

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/*
  +----------------------------------------------------------------------+
  | Copyright (c) The PHP Group                                          |
  +----------------------------------------------------------------------+
  | This source file is subject to version 3.01 of the PHP license,      |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | https://www.php.net/license/3_01.txt                                 |
  | If you did not receive a copy of the PHP license and are unable to   |
  | obtain it through the world-wide-web, please send a note to          |
  | license@php.net so we can mail you a copy immediately.               |
  +----------------------------------------------------------------------+
  | Author: Wez Furlong <wez@thebrainroom.com>                           |
  +----------------------------------------------------------------------+
*/
 
/* Memory Mapping interface for streams */
#include "php.h"
#include "php_streams_int.h"
 
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)
{
    php_stream_mmap_range range;
 
    range.offset = offset;
    range.length = length;
    range.mode = mode;
    range.mapped = NULL;
 
    if (PHP_STREAM_OPTION_RETURN_OK == php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_MAP_RANGE, &range)) {
        if (mapped_len) {
            *mapped_len = range.length;
        }
        return range.mapped;
    }
    return NULL;
}
 
PHPAPI int _php_stream_mmap_unmap(php_stream *stream)
{
    return php_stream_set_option(stream, PHP_STREAM_OPTION_MMAP_API, PHP_STREAM_MMAP_UNMAP, NULL) == PHP_STREAM_OPTION_RETURN_OK;
}
 
PHPAPI int _php_stream_mmap_unmap_ex(php_stream *stream, zend_off_t readden)
{
    int ret = 1;
 
    if (php_stream_seek(stream, readden, SEEK_CUR) != 0) {
        ret = 0;
    }
    if (php_stream_mmap_unmap(stream) == 0) {
        ret = 0;
    }
 
    return ret;
}