zend_multibyte.c

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/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) Zend Technologies Ltd. (http://www.zend.com)           |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.00 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at                              |
   | http://www.zend.com/license/2_00.txt.                                |
   | If you did not receive a copy of the Zend license and are unable to  |
   | obtain it through the world-wide-web, please send a note to          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
   | Authors: Masaki Fujimoto <fujimoto@php.net>                          |
   |          Rui Hirokawa <hirokawa@php.net>                             |
   +----------------------------------------------------------------------+
*/
 
#include "zend.h"
#include "zend_compile.h"
#include "zend_operators.h"
#include "zend_multibyte.h"
#include "zend_ini.h"
 
static const zend_encoding *dummy_encoding_fetcher(const char *encoding_name)
{
    return NULL;
}
 
static const char *dummy_encoding_name_getter(const zend_encoding *encoding)
{
    return (const char*)encoding;
}
 
static bool dummy_encoding_lexer_compatibility_checker(const zend_encoding *encoding)
{
    return 0;
}
 
static const zend_encoding *dummy_encoding_detector(const unsigned char *string, size_t length, const zend_encoding **list, size_t list_size)
{
    return NULL;
}
 
static size_t dummy_encoding_converter(unsigned char **to, size_t *to_length, const unsigned char *from, size_t from_length, const zend_encoding *encoding_to, const zend_encoding *encoding_from)
{
    return (size_t)-1;
}
 
static zend_result dummy_encoding_list_parser(const char *encoding_list, size_t encoding_list_len, const zend_encoding ***return_list, size_t *return_size, bool persistent)
{
    *return_list = pemalloc(0, persistent);
    *return_size = 0;
    return SUCCESS;
}
 
static const zend_encoding *dummy_internal_encoding_getter(void)
{
    return NULL;
}
 
static zend_result dummy_internal_encoding_setter(const zend_encoding *encoding)
{
    return FAILURE;
}
 
static zend_multibyte_functions multibyte_functions_dummy;
static zend_multibyte_functions multibyte_functions = {
    NULL,
    dummy_encoding_fetcher,
    dummy_encoding_name_getter,
    dummy_encoding_lexer_compatibility_checker,
    dummy_encoding_detector,
    dummy_encoding_converter,
    dummy_encoding_list_parser,
    dummy_internal_encoding_getter,
    dummy_internal_encoding_setter
};
 
ZEND_API const zend_encoding *zend_multibyte_encoding_utf32be = (const zend_encoding*)"UTF-32BE";
ZEND_API const zend_encoding *zend_multibyte_encoding_utf32le = (const zend_encoding*)"UTF-32LE";
ZEND_API const zend_encoding *zend_multibyte_encoding_utf16be = (const zend_encoding*)"UTF-16BE";
ZEND_API const zend_encoding *zend_multibyte_encoding_utf16le = (const zend_encoding*)"UTF-32LE";
ZEND_API const zend_encoding *zend_multibyte_encoding_utf8 = (const zend_encoding*)"UTF-8";
 
ZEND_API zend_result zend_multibyte_set_functions(const zend_multibyte_functions *functions)
{
    zend_multibyte_encoding_utf32be = functions->encoding_fetcher("UTF-32BE");
    if (!zend_multibyte_encoding_utf32be) {
        return FAILURE;
    }
    zend_multibyte_encoding_utf32le = functions->encoding_fetcher("UTF-32LE");
    if (!zend_multibyte_encoding_utf32le) {
        return FAILURE;
    }
    zend_multibyte_encoding_utf16be = functions->encoding_fetcher("UTF-16BE");
    if (!zend_multibyte_encoding_utf16be) {
        return FAILURE;
    }
    zend_multibyte_encoding_utf16le = functions->encoding_fetcher("UTF-16LE");
    if (!zend_multibyte_encoding_utf16le) {
        return FAILURE;
    }
    zend_multibyte_encoding_utf8 = functions->encoding_fetcher("UTF-8");
    if (!zend_multibyte_encoding_utf8) {
        return FAILURE;
    }
 
    multibyte_functions_dummy = multibyte_functions;
    multibyte_functions = *functions;
 
    /* As zend_multibyte_set_functions() gets called after ini settings were
     * populated, we need to reinitialize script_encoding here.
     */
    {
        const char *value = zend_ini_string("zend.script_encoding", sizeof("zend.script_encoding") - 1, 0);
        zend_multibyte_set_script_encoding_by_string(value, strlen(value));
    }
    return SUCCESS;
}
 
ZEND_API void zend_multibyte_restore_functions(void)
{
    multibyte_functions = multibyte_functions_dummy;
}
 
ZEND_API const zend_multibyte_functions *zend_multibyte_get_functions(void)
{
    return multibyte_functions.provider_name ? &multibyte_functions: NULL;
}
 
ZEND_API const zend_encoding *zend_multibyte_fetch_encoding(const char *name)
{
    return multibyte_functions.encoding_fetcher(name);
}
 
ZEND_API const char *zend_multibyte_get_encoding_name(const zend_encoding *encoding)
{
    return multibyte_functions.encoding_name_getter(encoding);
}
 
ZEND_API int zend_multibyte_check_lexer_compatibility(const zend_encoding *encoding)
{
    return multibyte_functions.lexer_compatibility_checker(encoding);
}
 
ZEND_API const zend_encoding *zend_multibyte_encoding_detector(const unsigned char *string, size_t length, const zend_encoding **list, size_t list_size)
{
    return multibyte_functions.encoding_detector(string, length, list, list_size);
}
 
ZEND_API size_t zend_multibyte_encoding_converter(unsigned char **to, size_t *to_length, const unsigned char *from, size_t from_length, const zend_encoding *encoding_to, const zend_encoding *encoding_from)
{
    return multibyte_functions.encoding_converter(to, to_length, from, from_length, encoding_to, encoding_from);
}
 
ZEND_API zend_result zend_multibyte_parse_encoding_list(const char *encoding_list, size_t encoding_list_len, const zend_encoding ***return_list, size_t *return_size, bool persistent)
{
    return multibyte_functions.encoding_list_parser(encoding_list, encoding_list_len, return_list, return_size, persistent);
}
 
ZEND_API const zend_encoding *zend_multibyte_get_internal_encoding(void)
{
    return multibyte_functions.internal_encoding_getter();
}
 
ZEND_API const zend_encoding *zend_multibyte_get_script_encoding(void)
{
    return LANG_SCNG(script_encoding);
}
 
ZEND_API zend_result zend_multibyte_set_script_encoding(const zend_encoding **encoding_list, size_t encoding_list_size)
{
    if (CG(script_encoding_list)) {
        free((char*)CG(script_encoding_list));
    }
    CG(script_encoding_list) = encoding_list;
    CG(script_encoding_list_size) = encoding_list_size;
    return SUCCESS;
}
 
ZEND_API zend_result zend_multibyte_set_internal_encoding(const zend_encoding *encoding)
{
    return multibyte_functions.internal_encoding_setter(encoding);
}
 
ZEND_API zend_result zend_multibyte_set_script_encoding_by_string(const char *new_value, size_t new_value_length)
{
    const zend_encoding **list = 0;
    size_t size = 0;
 
    if (!new_value) {
        zend_multibyte_set_script_encoding(NULL, 0);
        return SUCCESS;
    }
 
    if (FAILURE == zend_multibyte_parse_encoding_list(new_value, new_value_length, &list, &size, 1)) {
        return FAILURE;
    }
 
    if (size == 0) {
        pefree((void*)list, 1);
        return FAILURE;
    }
 
    if (FAILURE == zend_multibyte_set_script_encoding(list, size)) {
        return FAILURE;
    }
 
    return SUCCESS;
}