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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2004 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 at 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> |
+----------------------------------------------------------------------+
*/

/* $Id$ */

#include "zend.h"
#include "zend_compile.h"
#include "zend_operators.h"
#include "zend_multibyte.h"

#ifdef ZEND_MULTIBYTE
static int zend_multibyte_encoding_filter(char **to, int *to_length, const char *to_encoding, const char *from, int from_length, const char *from_encoding TSRMLS_DC);
int sjis_input_filter(char **buf, int *length, const char *sjis, int sjis_length TSRMLS_DC);
int sjis_output_filter(char **buf, int *length, const char *sjis, int sjis_length TSRMLS_DC);
static char* zend_multibyte_assemble_encoding_list(zend_encoding **encoding_list, int encoding_list_size);
static int zend_multibyte_parse_encoding_list(const char *encoding_list, int encoding_list_size, zend_encoding ***result, int *result_size);
static zend_encoding* zend_multibyte_find_script_encoding(zend_encoding *onetime_encoding TSRMLS_DC);
static zend_encoding* zend_multibyte_detect_unicode(TSRMLS_D);
static zend_encoding* zend_multibyte_detect_utf_encoding(char *script, int script_size TSRMLS_DC);

/*
* encodings
*/
const char *ucs2_aliases[] = {"ISO-10646-UCS-2", "UCS2" , "UNICODE", NULL};
zend_encoding encoding_ucs2 = {
NULL,
NULL,
"UCS-2",
(const char *(*)[])&ucs2_aliases,
0
};

zend_encoding encoding_ucs2be = {
NULL,
NULL,
"UCS-2BE",
NULL,
0
};

zend_encoding encoding_ucs2le = {
NULL,
NULL,
"UCS-2LE",
NULL,
0
};

const char *ucs4_aliases[] = {"ISO-10646-UCS-4", "UCS4", NULL};
zend_encoding encoding_ucs4 = {
NULL,
NULL,
"UCS-4",
(const char *(*)[])&ucs4_aliases,
0
};

zend_encoding encoding_ucs4be = {
NULL,
NULL,
"UCS-4BE",
NULL,
0
};

zend_encoding encoding_ucs4le = {
NULL,
NULL,
"UCS-4LE",
NULL,
0
};

const char *utf32_aliases[] = {"utf32", NULL};
zend_encoding encoding_utf32 = {
NULL,
NULL,
"UTF-32",
(const char *(*)[])&utf32_aliases,
0
};

zend_encoding encoding_utf32be = {
NULL,
NULL,
"UTF-32BE",
NULL,
0
};

zend_encoding encoding_utf32le = {
NULL,
NULL,
"UTF-32LE",
NULL,
0
};

const char *utf16_aliases[] = {"utf16", NULL};
zend_encoding encoding_utf16 = {
NULL,
NULL,
"UTF-16",
(const char *(*)[])&utf16_aliases,
0
};

zend_encoding encoding_utf16be = {
NULL,
NULL,
"UTF-16BE",
NULL,
0
};

zend_encoding encoding_utf16le = {
NULL,
NULL,
"UTF-16LE",
NULL,
0
};

const char *utf8_aliases[] = {"utf8", NULL};
zend_encoding encoding_utf8 = {
NULL,
NULL,
"UTF-8",
(const char *(*)[])&utf8_aliases,
1
};

const char *ascii_aliases[] = {"ANSI_X3.4-1968", "iso-ir-6", "ANSI_X3.4-1986", "ISO_646.irv:1991", "US-ASCII", "ISO646-US", "us", "IBM367", "cp367", "csASCII", NULL};
zend_encoding encoding_ascii = {
NULL,
NULL,
"ASCII",
(const char *(*)[])&ascii_aliases,
1
};

const char *euc_jp_aliases[] = {"EUC", "EUC_JP", "eucJP", "x-euc-jp", NULL};
zend_encoding encoding_euc_jp = {
NULL,
NULL,
"EUC-JP",
(const char *(*)[])&euc_jp_aliases,
1
};

const char *sjis_aliases[] = {"x-sjis", "SJIS", "SHIFT-JIS", NULL};
zend_encoding encoding_sjis = {
sjis_input_filter,
sjis_output_filter,
"Shift_JIS",
(const char *(*)[])&sjis_aliases,
0
};

const char *eucjp_win_aliases[] = {"eucJP-open", NULL};
zend_encoding encoding_eucjp_win = {
NULL,
NULL,
"eucJP-win",
(const char *(*)[])&eucjp_win_aliases,
1
};

const char *sjis_win_aliases[] = {"SJIS-open", "MS_Kanji", "Windows-31J", "CP932", NULL};
zend_encoding encoding_sjis_win = {
/* sjis-filters does not care about diffs of Shift_JIS and CP932 */
sjis_input_filter,
sjis_output_filter,
"SJIS-win",
(const char *(*)[])&sjis_win_aliases,
0
};

const char *jis_aliases[] = {"ISO-2022-JP", NULL};
zend_encoding encoding_jis = {
NULL,
NULL,
"JIS",
(const char *(*)[])&jis_aliases,
0
};

const char *euc_cn_aliases[] = {"CN-GB", "EUC_CN", "eucCN", "x-euc-cn", "gb2312", NULL};
zend_encoding encoding_euc_cn = {
NULL,
NULL,
"EUC-CN",
(const char *(*)[])&euc_cn_aliases,
1
};

const char *cp936_aliases[] = {"CP-936", NULL};
zend_encoding encoding_cp936 = {
NULL,
NULL,
"CP936",
(const char *(*)[])&cp936_aliases,
0
};

const char *hz_aliases[] = {"HZ-GB-2312", NULL};
zend_encoding encoding_hz = {
NULL,
NULL,
"HZ",
(const char *(*)[])&hz_aliases,
0
};

const char *euc_tw_aliases[] = {"EUC_TW", "eucTW", "x-euc-tw", NULL};
zend_encoding encoding_euc_tw = {
NULL,
NULL,
"EUC-TW",
(const char *(*)[])&euc_tw_aliases,
1
};

const char *big5_aliases[] = {"BIG5", "CN-BIG5", "BIG-FIVE", "BIGFIVE", "CP950", NULL};
zend_encoding encoding_big5 = {
NULL,
NULL,
"BIG-5",
(const char *(*)[])&big5_aliases,
0
};

const char *euc_kr_aliases[] = {"EUC_KR", "eucKR", "x-euc-kr", NULL};
zend_encoding encoding_euc_kr = {
NULL,
NULL,
"EUC-KR",
(const char *(*)[])&euc_kr_aliases,
1
};

const char *uhc_aliases[] = {"CP949", NULL};
zend_encoding encoding_uhc = {
NULL,
NULL,
"UHC",
(const char *(*)[])&uhc_aliases,
1
};

zend_encoding encoding_2022kr = {
NULL,
NULL,
"ISO-2022-KR",
NULL,
0
};

const char *cp1252_aliases[] = {"cp1252", NULL};
zend_encoding encoding_cp1252 = {
NULL,
NULL,
"Windows-1252",
(const char *(*)[])&cp1252_aliases,
1
};

const char *iso_8859_1_aliases[] = {"ISO_8859-1", "latin1", NULL};
zend_encoding encoding_8859_1 = {
NULL,
NULL,
"ISO-8859-1",
(const char *(*)[])&iso_8859_1_aliases,
1
};

const char *iso_8859_2_aliases[] = {"ISO_8859-2", "latin2", NULL};
zend_encoding encoding_8859_2 = {
NULL,
NULL,
"ISO-8859-2",
(const char *(*)[])&iso_8859_2_aliases,
1
};

const char *iso_8859_3_aliases[] = {"ISO_8859-3", "latin3", NULL};
zend_encoding encoding_8859_3 = {
NULL,
NULL,
"ISO-8859-3",
(const char *(*)[])&iso_8859_3_aliases,
1
};

const char *iso_8859_4_aliases[] = {"ISO_8859-4", "latin4", NULL};
zend_encoding encoding_8859_4 = {
NULL,
NULL,
"ISO-8859-4",
(const char *(*)[])&iso_8859_4_aliases,
1
};

const char *iso_8859_5_aliases[] = {"ISO_8859-5", "cyrillic", NULL};
zend_encoding encoding_8859_5 = {
NULL,
NULL,
"ISO-8859-5",
(const char *(*)[])&iso_8859_5_aliases,
1
};

const char *iso_8859_6_aliases[] = {"ISO_8859-6", "arabic", NULL};
zend_encoding encoding_8859_6 = {
NULL,
NULL,
"ISO-8859-6",
(const char *(*)[])&iso_8859_6_aliases,
1
};

const char *iso_8859_7_aliases[] = {"ISO_8859-7", "greek", NULL};
zend_encoding encoding_8859_7 = {
NULL,
NULL,
"ISO-8859-7",
(const char *(*)[])&iso_8859_7_aliases,
1
};

const char *iso_8859_8_aliases[] = {"ISO_8859-8", "hebrew", NULL};
zend_encoding encoding_8859_8 = {
NULL,
NULL,
"ISO-8859-8",
(const char *(*)[])&iso_8859_8_aliases,
1
};

const char *iso_8859_9_aliases[] = {"ISO_8859-9", "latin5", NULL};
zend_encoding encoding_8859_9 = {
NULL,
NULL,
"ISO-8859-9",
(const char *(*)[])&iso_8859_9_aliases,
1
};

const char *iso_8859_10_aliases[] = {"ISO_8859-10", "latin6", NULL};
zend_encoding encoding_8859_10 = {
NULL,
NULL,
"ISO-8859-10",
(const char *(*)[])&iso_8859_10_aliases,
1
};

const char *iso_8859_13_aliases[] = {"ISO_8859-13", NULL};
zend_encoding encoding_8859_13 = {
NULL,
NULL,
"ISO-8859-13",
(const char *(*)[])&iso_8859_13_aliases,
1
};

const char *iso_8859_14_aliases[] = {"ISO_8859-14", "latin8", NULL};
zend_encoding encoding_8859_14 = {
NULL,
NULL,
"ISO-8859-14",
(const char *(*)[])&iso_8859_14_aliases,
1
};

const char *iso_8859_15_aliases[] = {"ISO_8859-15", NULL};
zend_encoding encoding_8859_15 = {
NULL,
NULL,
"ISO-8859-15",
(const char *(*)[])&iso_8859_15_aliases,
1
};

const char *cp1251_aliases[] = {"CP1251", "CP-1251", "WINDOWS-1251", NULL};
zend_encoding encoding_cp1251 = {
NULL,
NULL,
"Windows-1251",
(const char *(*)[])&cp1251_aliases,
1
};

const char *cp866_aliases[] = {"CP866", "CP-866", "IBM-866", NULL};
zend_encoding encoding_cp866 = {
NULL,
NULL,
"CP866",
(const char *(*)[])&cp866_aliases,
1
};

const char *koi8r_aliases[] = {"KOI8-R", "KOI8R", NULL};
zend_encoding encoding_koi8r = {
NULL,
NULL,
"KOI8-R",
(const char *(*)[])&koi8r_aliases,
1
};

zend_encoding *zend_encoding_table[] = {
&encoding_ucs4,
&encoding_ucs4be,
&encoding_ucs4le,
&encoding_ucs2,
&encoding_ucs2be,
&encoding_ucs2le,
&encoding_utf32,
&encoding_utf32be,
&encoding_utf32le,
&encoding_utf16,
&encoding_utf16be,
&encoding_utf16le,
&encoding_utf8,
&encoding_ascii,
&encoding_euc_jp,
&encoding_sjis,
&encoding_eucjp_win,
&encoding_sjis_win,
&encoding_jis,
&encoding_cp1252,
&encoding_8859_1,
&encoding_8859_2,
&encoding_8859_3,
&encoding_8859_4,
&encoding_8859_5,
&encoding_8859_6,
&encoding_8859_7,
&encoding_8859_8,
&encoding_8859_9,
&encoding_8859_10,
&encoding_8859_13,
&encoding_8859_14,
&encoding_8859_15,
&encoding_euc_cn,
&encoding_cp936,
&encoding_hz,
&encoding_euc_tw,
&encoding_big5,
&encoding_euc_kr,
&encoding_uhc,
&encoding_2022kr,
&encoding_cp1251,
&encoding_cp866,
&encoding_koi8r,
NULL
};



ZEND_API int zend_multibyte_set_script_encoding(char *encoding_list, int encoding_list_size TSRMLS_DC)
{
if (CG(script_encoding_list)) {
efree(CG(script_encoding_list));
CG(script_encoding_list) = NULL;
}
CG(script_encoding_list_size) = 0;

if (!encoding_list) {
return 0;
}

zend_multibyte_parse_encoding_list(encoding_list, encoding_list_size, &(CG(script_encoding_list)), &(CG(script_encoding_list_size)));

return 0;
}


ZEND_API int zend_multibyte_set_internal_encoding(char *encoding_name, int encoding_name_size TSRMLS_DC)
{
CG(internal_encoding) = zend_multibyte_fetch_encoding(encoding_name);
return 0;
}

ZEND_API int zend_multibyte_set_functions(zend_encoding_detector encoding_detector, zend_encoding_converter encoding_converter, zend_encoding_oddlen encoding_oddlen TSRMLS_DC)
{
CG(encoding_detector) = encoding_detector;
CG(encoding_converter) = encoding_converter;
CG(encoding_oddlen) = encoding_oddlen;
return 0;
}


ZEND_API int zend_multibyte_set_filter(zend_encoding *onetime_encoding TSRMLS_DC)
{
LANG_SCNG(script_encoding) = zend_multibyte_find_script_encoding(onetime_encoding TSRMLS_CC);
LANG_SCNG(internal_encoding) = CG(internal_encoding);

/* judge input/output filter */
LANG_SCNG(input_filter) = NULL;
LANG_SCNG(output_filter) = NULL;

if (!LANG_SCNG(script_encoding)) {
return 0;
}

if (!LANG_SCNG(internal_encoding) || LANG_SCNG(script_encoding) == LANG_SCNG(internal_encoding)) {
/* if encoding specfic filters exist, use them */
if (LANG_SCNG(script_encoding)->input_filter && LANG_SCNG(script_encoding)->output_filter) {
LANG_SCNG(input_filter) = LANG_SCNG(script_encoding)->input_filter;
LANG_SCNG(output_filter) = LANG_SCNG(script_encoding)->output_filter;
return 0;
}

if (!LANG_SCNG(script_encoding)->compatible) {
/* and if not, work around w/ script_encoding -> utf-8 -> script_encoding conversion */
LANG_SCNG(internal_encoding) = LANG_SCNG(script_encoding);
LANG_SCNG(input_filter) = zend_multibyte_script_encoding_filter;
LANG_SCNG(output_filter) = zend_multibyte_internal_encoding_filter;
return 0;
} else {
/* nothing to do in this case */
return 0;
}
}

/* LANG_SCNG(internal_encoding) cannot be NULL here */
if (LANG_SCNG(internal_encoding)->compatible) {
LANG_SCNG(input_filter) = zend_multibyte_script_encoding_filter;
return 0;
} else if (LANG_SCNG(script_encoding)->compatible) {
LANG_SCNG(output_filter) = zend_multibyte_internal_encoding_filter;
return 0;
}

/* both script and internal encodings are incompatible w/ flex */
LANG_SCNG(input_filter) = zend_multibyte_script_encoding_filter;
LANG_SCNG(output_filter) = zend_multibyte_internal_encoding_filter;

return 0;
}


ZEND_API zend_encoding* zend_multibyte_fetch_encoding(char *encoding_name)
{
int i, j;
zend_encoding *encoding;

if (!encoding_name) {
return NULL;
}

for (i = 0; (encoding = zend_encoding_table[i]) != NULL; i++) {
if (zend_binary_strcasecmp((char*)encoding->name, strlen(encoding->name), encoding_name, strlen(encoding_name)) == 0) {
return encoding;
}
}

for (i = 0; (encoding = zend_encoding_table[i]) != NULL; i++) {
if (encoding->aliases != NULL) {
for (j = 0; (*encoding->aliases)[j] != NULL; j++) {
if (zend_binary_strcasecmp((char*)(*encoding->aliases)[j], strlen((*encoding->aliases)[j]), encoding_name, strlen(encoding_name)) == 0) {
return encoding;
}
}
}
}

return NULL;
}


ZEND_API int zend_multibyte_script_encoding_filter(char **to, int *to_length, const char *from, int from_length TSRMLS_DC)
{
const char *name;

if (LANG_SCNG(internal_encoding) == NULL || LANG_SCNG(internal_encoding)->compatible == 0) {
name = "UTF-8";
} else {
name = LANG_SCNG(internal_encoding)->name;
}

return zend_multibyte_encoding_filter(to, to_length, name, from, from_length, LANG_SCNG(script_encoding)->name TSRMLS_CC);
}

ZEND_API int zend_multibyte_internal_encoding_filter(char **to, int *to_length, const char *from, int from_length TSRMLS_DC)
{
const char *name;

if (LANG_SCNG(script_encoding)->compatible == 0) {
name = "UTF-8";
} else {
name = LANG_SCNG(script_encoding)->name;
}

return zend_multibyte_encoding_filter(to, to_length, LANG_SCNG(internal_encoding)->name, from, from_length, name TSRMLS_CC);
}

static int zend_multibyte_encoding_filter(char **to, int *to_length, const char *to_encoding, const char *from, int from_length, const char *from_encoding TSRMLS_DC)
{
int oddlen;

if (!CG(encoding_converter)) {
return 0;
}

if (CG(encoding_oddlen)) {
oddlen = CG(encoding_oddlen)(from, from_length, from_encoding TSRMLS_CC);
if (oddlen > 0) {
from_length -= oddlen;
}
}

if (CG(encoding_converter)(to, to_length, from, from_length, to_encoding, from_encoding TSRMLS_CC) != 0) {
return 0;
}

return from_length;
}


/*
* Shift_JIS Input/Output Filter
*/
static const unsigned char table_sjis[] = { /* 0x80-0x9f,0xE0-0xEF */
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 0, 0, 0
};

int sjis_input_filter(char **buf, int *length, const char *sjis, int sjis_length TSRMLS_DC)
{
unsigned char *p, *q;
unsigned char c1, c2;

*buf = (char*)emalloc(sjis_length*3/2+1);
if (!*buf)
return 0;
*length = 0;

p = (unsigned char*)sjis;
q = (unsigned char*)*buf;

/* convert [SJIS -> EUC-JP] (for lex scan) -- some other better ways? */
while (*p && (p-(unsigned char*)sjis) < sjis_length) {
if (!(*p & 0x80)) {
*q++ = *p++;
continue;
}

/* handling 8 bit code */
if (table_sjis[*p] == 1) {
/* 1 byte kana */
*q++ = 0x8e;
*q++ = *p++;
continue;
}

if (!*(p+1)) {
*q++ = *p++;
break;
}

if (table_sjis[*p] == 2) {
/* 2 byte kanji code */
c1 = *p++;
if (!*p || (p-(unsigned char*)sjis) >= sjis_length) {
break;
}
c2 = *p++;
c1 -= (c1 <= 0x9f) ? 0x71 : 0xb1;
c1 = (c1 << 1) + 1;
if (c2 >= 0x9e) {
c2 -= 0x7e;
c1++;
} else if (c2 > 0x7f) {
c2 -= 0x20;
} else {
c2 -= 0x1f;
}

c1 |= 0x80;
c2 |= 0x80;

*q++ = c1;
*q++ = c2;
} else {
/*
* for user defined chars (ATTENTION)
*
* THESE ARE NOT CODE FOR CONVERSION! :-P
* (using *ILLEGALLY* 3byte EUC-JP space)
*
* we cannot perfectly (== 1 to 1) convert these chars to EUC-JP.
* so, these code are for perfect RESTORING in sjis_output_filter()
*/
c1 = *p++;
if (!*p || (p-(unsigned char*)sjis) >= sjis_length) {
break;
}
c2 = *p++;
*q++ = (char)0x8f;
/*
* MAP TO (EUC-JP):
* type A: 0xeba1 - 0xf4fe
* type B: 0xf5a1 - 0xfefe
* type C: 0xa1a1 - 0xa6fe
*/
c1 -= (c1 > 0xf9) ? (0x79+0x71) : (0x0a+0xb1);
c1 = (c1 << 1) + 1;
if (c2 >= 0x9e) {
c2 -= 0x7e;
c1++;
} else if (c2 > 0x7f) {
c2 -= 0x20;
} else {
c2 -= 0x1f;
}

c1 |= 0x80;
c2 |= 0x80;

*q++ = c1;
*q++ = c2;
}
}
*q = (char)NULL;
*length = (char*)q - *buf;

return *length;
}

static const unsigned char table_eucjp[] = { /* 0xA1-0xFE */
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
};

int sjis_output_filter(char **sjis, int *sjis_length, const char *buf, int length TSRMLS_DC)
{
unsigned char c1, c2;
char *p;
const char *q;

if (!sjis || !sjis_length) {
return 0;
}

/* always Shift_JIS <= EUC-JP */
*sjis = (char*)emalloc(length+1);
if (!sjis) {
return 0;
}
p = *sjis;
q = buf;

/* restore converted strings [EUC-JP -> Shift_JIS] */
while (*q) {
if (!(*q & 0x80)) {
*p++ = *q++;
continue;
}

/* hankaku kana */
if (*q == (char)0x8e) {
q++;
if (*q) {
*p++ = *q++;
}
continue;
}

/* 2 byte kanji code */
if (table_eucjp[(unsigned char)*q] == 2) {
c1 = (*q++ & ~0x80) & 0xff;
if (*q) {
c2 = (*q++ & ~0x80) & 0xff;
} else {
q--;
break;
}

c2 += (c1 & 0x01) ? 0x1f : 0x7d;
if (c2 >= 0x7f) {
c2++;
}
c1 = ((c1 - 0x21) >> 1) + 0x81;
if (c1 > 0x9f) {
c1 += 0x40;
}

*p++ = c1;
*p++ = c2;
continue;
}

if (*q == (char)0x8f) {
q++;
if (*q) {
c1 = (*q++ & ~0x80) & 0xff;
} else {
q--;
break;
}
if (*q) {
c2 = (*q++ & ~0x80) & 0xff;
} else {
q -= 2;
break;
}

c2 += (c1 & 0x01) ? 0x1f : 0x7d;
if (c2 >= 0x7f) {
c2++;
}
c1 = ((c1 - 0x21) >> 1) + 0x81;
if (c1 > 0x9f) {
c1 += 0x40;
}

if (c1 >= 0x81 && c1 <= 0x9f) {
c1 += 0x79;
} else {
c1 += 0x0a;
}

*p++ = c1;
*p++ = c2;
continue;
}

/* some other chars (may not happen) */
*p++ = *q++;
}
*p = '\0';
*sjis_length = p - *sjis;

return q-buf; /* return length we actually read */
}


static char* zend_multibyte_assemble_encoding_list(zend_encoding **encoding_list, int encoding_list_size)
{
int i, list_size = 0;
const char *name;
char *list = NULL;

if (!encoding_list || !encoding_list_size) {
return NULL;
}

for (i = 0; i < encoding_list_size; i++) {
name = (*(encoding_list+i))->name;
if (name) {
list_size += strlen(name) + 1;
if (!list) {
list = (char*)emalloc(list_size);
if (!list) {
return NULL;
}
*list = (char)NULL;
} else {
list = (char*)erealloc(list, list_size);
if (!list) {
return NULL;
}
strcat(list, ",");
}
strcat(list, name);
}
}
return list;
}


static int zend_multibyte_parse_encoding_list(const char *encoding_list, int encoding_list_size, zend_encoding ***result, int *result_size)
{
int n, size;
char *p, *p1, *p2, *endp, *tmpstr;
zend_encoding **list, **entry, *encoding;

list = NULL;
if (encoding_list == NULL || encoding_list_size <= 0) {
return -1;
} else {
/* copy the encoding_list string for work */
tmpstr = (char *)estrndup(encoding_list, encoding_list_size);
if (tmpstr == NULL) {
return -1;
}
/* count the number of listed encoding names */
endp = tmpstr + encoding_list_size;
n = 1;
p1 = tmpstr;
while ((p2 = zend_memnstr(p1, ",", 1, endp)) != NULL) {
p1 = p2 + 1;
n++;
}
size = n;
/* make list */
list = (zend_encoding**)ecalloc(size, sizeof(zend_encoding*));
if (list != NULL) {
entry = list;
n = 0;
p1 = tmpstr;
do {
p2 = p = zend_memnstr(p1, ",", 1, endp);
if (p == NULL) {
p = endp;
}
*p = '\0';
/* trim spaces */
while (p1 < p && (*p1 == ' ' || *p1 == '\t')) {
p1++;
}
p--;
while (p > p1 && (*p == ' ' || *p == '\t')) {
*p = '\0';
p--;
}
/* convert to the encoding number and check encoding */
encoding = zend_multibyte_fetch_encoding(p1);
if (encoding)
{
*entry++ = encoding;
n++;
}
p1 = p2 + 1;
} while (n < size && p2 != NULL);
*result = list;
*result_size = n;
}
efree(tmpstr);
}

if (list == NULL) {
return -1;
}

return 0;
}


static zend_encoding* zend_multibyte_find_script_encoding(zend_encoding *onetime_encoding TSRMLS_DC)
{
zend_encoding *script_encoding;
char *name, *list;

/* onetime_encoding is prior to everything */
if (onetime_encoding != NULL) {
return onetime_encoding;
}

/* check out bom(byte order mark) and see if containing wchars */
script_encoding = zend_multibyte_detect_unicode(TSRMLS_C);
if (script_encoding != NULL) {
/* bom or wchar detection is prior to 'script_encoding' option */
return script_encoding;
}

/* if no script_encoding specified, just leave alone */
if (!CG(script_encoding_list) || !CG(script_encoding_list_size)) {
return NULL;
}

/* if multiple encodings specified, detect automagically */
if (CG(script_encoding_list_size) > 1 && CG(encoding_detector)) {
list = zend_multibyte_assemble_encoding_list(CG(script_encoding_list),
CG(script_encoding_list_size));
name = CG(encoding_detector)(LANG_SCNG(script_org),
LANG_SCNG(script_org_size), list TSRMLS_CC);
if (list) {
efree(list);
}
if (name) {
script_encoding = zend_multibyte_fetch_encoding(name);
efree(name);
} else {
script_encoding = NULL;
}
return script_encoding;
}

return *(CG(script_encoding_list));
}


static zend_encoding* zend_multibyte_detect_unicode(TSRMLS_D)
{
zend_encoding *script_encoding = NULL;
int bom_size;
char *script;

if (LANG_SCNG(script_org_size) < sizeof(BOM_UTF32_LE)-1) {
return NULL;
}

/* check out BOM */
if (!memcmp(LANG_SCNG(script_org), BOM_UTF32_BE, sizeof(BOM_UTF32_BE)-1)) {
script_encoding = &encoding_utf32be;
bom_size = sizeof(BOM_UTF32_BE)-1;
} else if (!memcmp(LANG_SCNG(script_org), BOM_UTF32_LE, sizeof(BOM_UTF32_LE)-1)) {
script_encoding = &encoding_utf32le;
bom_size = sizeof(BOM_UTF32_LE)-1;
} else if (!memcmp(LANG_SCNG(script_org), BOM_UTF16_BE, sizeof(BOM_UTF16_BE)-1)) {
script_encoding = &encoding_utf16be;
bom_size = sizeof(BOM_UTF16_BE)-1;
} else if (!memcmp(LANG_SCNG(script_org), BOM_UTF16_LE, sizeof(BOM_UTF16_LE)-1)) {
script_encoding = &encoding_utf16le;
bom_size = sizeof(BOM_UTF16_LE)-1;
} else if (!memcmp(LANG_SCNG(script_org), BOM_UTF8, sizeof(BOM_UTF8)-1)) {
script_encoding = &encoding_utf8;
bom_size = sizeof(BOM_UTF8)-1;
}

if (script_encoding) {
/* remove BOM */
script = (char*)emalloc(LANG_SCNG(script_org_size)+1-bom_size);
memcpy(script, LANG_SCNG(script_org)+bom_size, LANG_SCNG(script_org_size)+1-bom_size);
efree(LANG_SCNG(script_org));
LANG_SCNG(script_org) = script;
LANG_SCNG(script_org_size) -= bom_size;

return script_encoding;
}

/* script contains NULL bytes -> auto-detection */
if (memchr(LANG_SCNG(script_org), 0, LANG_SCNG(script_org_size))) {
/* make best effort if BOM is missing */
return zend_multibyte_detect_utf_encoding(LANG_SCNG(script_org), LANG_SCNG(script_org_size) TSRMLS_CC);
}

return NULL;
}

static zend_encoding* zend_multibyte_detect_utf_encoding(char *script, int script_size TSRMLS_DC)
{
char *p;
int wchar_size = 2;
int le = 0;

/* utf-16 or utf-32? */
p = script;
while ((p-script) < script_size) {
p = memchr(p, 0, script_size-(p-script)-2);
if (!p) {
break;
}
if (*(p+1) == (char)NULL && *(p+2) == (char)NULL) {
wchar_size = 4;
break;
}

/* searching for UTF-32 specific byte orders, so this will do */
p += 4;
}

/* BE or LE? */
p = script;
while ((p-script) < script_size) {
if (*p == (char)NULL && *(p+wchar_size-1) != (char)NULL) {
/* BE */
le = 0;
break;
} else if (*p != (char)NULL && *(p+wchar_size-1) == (char)NULL) {
/* LE* */
le = 1;
break;
}
p += wchar_size;
}

if (wchar_size == 2) {
return le ? &encoding_utf16le : &encoding_utf16be;
} else {
return le ? &encoding_utf32le : &encoding_utf32be;
}

return NULL;
}
#endif /* ZEND_MULTIBYTE */

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 tw=78
* vim<600: sw=4 ts=4 tw=78
*/
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