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html.c
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/*
+----------------------------------------------------------------------+
| PHP Version 7 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2018 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: |
| http://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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Rasmus Lerdorf <[email protected]> |
| Jaakko Hyvätti <[email protected]> |
| Wez Furlong <[email protected]> |
| Gustavo Lopes <[email protected]> |
+----------------------------------------------------------------------+
*/
/*
* HTML entity resources:
*
* http://www.unicode.org/Public/MAPPINGS/OBSOLETE/UNI2SGML.TXT
*
* XHTML 1.0 DTD
* http://www.w3.org/TR/2002/REC-xhtml1-20020801/dtds.html#h-A2
*
* From HTML 4.01 strict DTD:
* http://www.w3.org/TR/html4/HTMLlat1.ent
* http://www.w3.org/TR/html4/HTMLsymbol.ent
* http://www.w3.org/TR/html4/HTMLspecial.ent
*
* HTML 5:
* http://dev.w3.org/html5/spec/Overview.html#named-character-references
*/
#include "php.h"
#ifdef PHP_WIN32
#include "config.w32.h"
#else
#include <php_config.h>
#endif
#include "php_standard.h"
#include "php_string.h"
#include "SAPI.h"
#if HAVE_LOCALE_H
#include <locale.h>
#endif
#if HAVE_LANGINFO_H
#include <langinfo.h>
#endif
#include <zend_hash.h>
#include "html_tables.h"
/* Macro for disabling flag of translation of non-basic entities where this isn't supported.
* Not appropriate for html_entity_decode/htmlspecialchars_decode */
#define LIMIT_ALL(all, doctype, charset) do { \
(all) = (all) && !CHARSET_PARTIAL_SUPPORT((charset)) && ((doctype) != ENT_HTML_DOC_XML1); \
} while (0)
#define MB_FAILURE(pos, advance) do { \
*cursor = pos + (advance); \
*status = FAILURE; \
return 0; \
} while (0)
#define CHECK_LEN(pos, chars_need) ((str_len - (pos)) >= (chars_need))
/* valid as single byte character or leading byte */
#define utf8_lead(c) ((c) < 0x80 || ((c) >= 0xC2 && (c) <= 0xF4))
/* whether it's actually valid depends on other stuff;
* this macro cannot check for non-shortest forms, surrogates or
* code points above 0x10FFFF */
#define utf8_trail(c) ((c) >= 0x80 && (c) <= 0xBF)
#define gb2312_lead(c) ((c) != 0x8E && (c) != 0x8F && (c) != 0xA0 && (c) != 0xFF)
#define gb2312_trail(c) ((c) >= 0xA1 && (c) <= 0xFE)
#define sjis_lead(c) ((c) != 0x80 && (c) != 0xA0 && (c) < 0xFD)
#define sjis_trail(c) ((c) >= 0x40 && (c) != 0x7F && (c) < 0xFD)
/* {{{ get_default_charset
*/
static char *get_default_charset(void) {
if (PG(internal_encoding) && PG(internal_encoding)[0]) {
return PG(internal_encoding);
} else if (SG(default_charset) && SG(default_charset)[0] ) {
return SG(default_charset);
}
return NULL;
}
/* }}} */
/* {{{ get_next_char
*/
static inline unsigned int get_next_char(
enum entity_charset charset,
const unsigned char *str,
size_t str_len,
size_t *cursor,
int *status)
{
size_t pos = *cursor;
unsigned int this_char = 0;
*status = SUCCESS;
assert(pos <= str_len);
if (!CHECK_LEN(pos, 1))
MB_FAILURE(pos, 1);
switch (charset) {
case cs_utf_8:
{
/* We'll follow strategy 2. from section 3.6.1 of UTR #36:
* "In a reported illegal byte sequence, do not include any
* non-initial byte that encodes a valid character or is a leading
* byte for a valid sequence." */
unsigned char c;
c = str[pos];
if (c < 0x80) {
this_char = c;
pos++;
} else if (c < 0xc2) {
MB_FAILURE(pos, 1);
} else if (c < 0xe0) {
if (!CHECK_LEN(pos, 2))
MB_FAILURE(pos, 1);
if (!utf8_trail(str[pos + 1])) {
MB_FAILURE(pos, utf8_lead(str[pos + 1]) ? 1 : 2);
}
this_char = ((c & 0x1f) << 6) | (str[pos + 1] & 0x3f);
if (this_char < 0x80) { /* non-shortest form */
MB_FAILURE(pos, 2);
}
pos += 2;
} else if (c < 0xf0) {
size_t avail = str_len - pos;
if (avail < 3 ||
!utf8_trail(str[pos + 1]) || !utf8_trail(str[pos + 2])) {
if (avail < 2 || utf8_lead(str[pos + 1]))
MB_FAILURE(pos, 1);
else if (avail < 3 || utf8_lead(str[pos + 2]))
MB_FAILURE(pos, 2);
else
MB_FAILURE(pos, 3);
}
this_char = ((c & 0x0f) << 12) | ((str[pos + 1] & 0x3f) << 6) | (str[pos + 2] & 0x3f);
if (this_char < 0x800) { /* non-shortest form */
MB_FAILURE(pos, 3);
} else if (this_char >= 0xd800 && this_char <= 0xdfff) { /* surrogate */
MB_FAILURE(pos, 3);
}
pos += 3;
} else if (c < 0xf5) {
size_t avail = str_len - pos;
if (avail < 4 ||
!utf8_trail(str[pos + 1]) || !utf8_trail(str[pos + 2]) ||
!utf8_trail(str[pos + 3])) {
if (avail < 2 || utf8_lead(str[pos + 1]))
MB_FAILURE(pos, 1);
else if (avail < 3 || utf8_lead(str[pos + 2]))
MB_FAILURE(pos, 2);
else if (avail < 4 || utf8_lead(str[pos + 3]))
MB_FAILURE(pos, 3);
else
MB_FAILURE(pos, 4);
}
this_char = ((c & 0x07) << 18) | ((str[pos + 1] & 0x3f) << 12) | ((str[pos + 2] & 0x3f) << 6) | (str[pos + 3] & 0x3f);
if (this_char < 0x10000 || this_char > 0x10FFFF) { /* non-shortest form or outside range */
MB_FAILURE(pos, 4);
}
pos += 4;
} else {
MB_FAILURE(pos, 1);
}
}
break;
case cs_big5:
/* reference http://demo.icu-project.org/icu-bin/convexp?conv=big5 */
{
unsigned char c = str[pos];
if (c >= 0x81 && c <= 0xFE) {
unsigned char next;
if (!CHECK_LEN(pos, 2))
MB_FAILURE(pos, 1);
next = str[pos + 1];
if ((next >= 0x40 && next <= 0x7E) ||
(next >= 0xA1 && next <= 0xFE)) {
this_char = (c << 8) | next;
} else {
MB_FAILURE(pos, 1);
}
pos += 2;
} else {
this_char = c;
pos += 1;
}
}
break;
case cs_big5hkscs:
{
unsigned char c = str[pos];
if (c >= 0x81 && c <= 0xFE) {
unsigned char next;
if (!CHECK_LEN(pos, 2))
MB_FAILURE(pos, 1);
next = str[pos + 1];
if ((next >= 0x40 && next <= 0x7E) ||
(next >= 0xA1 && next <= 0xFE)) {
this_char = (c << 8) | next;
} else if (next != 0x80 && next != 0xFF) {
MB_FAILURE(pos, 1);
} else {
MB_FAILURE(pos, 2);
}
pos += 2;
} else {
this_char = c;
pos += 1;
}
}
break;
case cs_gb2312: /* EUC-CN */
{
unsigned char c = str[pos];
if (c >= 0xA1 && c <= 0xFE) {
unsigned char next;
if (!CHECK_LEN(pos, 2))
MB_FAILURE(pos, 1);
next = str[pos + 1];
if (gb2312_trail(next)) {
this_char = (c << 8) | next;
} else if (gb2312_lead(next)) {
MB_FAILURE(pos, 1);
} else {
MB_FAILURE(pos, 2);
}
pos += 2;
} else if (gb2312_lead(c)) {
this_char = c;
pos += 1;
} else {
MB_FAILURE(pos, 1);
}
}
break;
case cs_sjis:
{
unsigned char c = str[pos];
if ((c >= 0x81 && c <= 0x9F) || (c >= 0xE0 && c <= 0xFC)) {
unsigned char next;
if (!CHECK_LEN(pos, 2))
MB_FAILURE(pos, 1);
next = str[pos + 1];
if (sjis_trail(next)) {
this_char = (c << 8) | next;
} else if (sjis_lead(next)) {
MB_FAILURE(pos, 1);
} else {
MB_FAILURE(pos, 2);
}
pos += 2;
} else if (c < 0x80 || (c >= 0xA1 && c <= 0xDF)) {
this_char = c;
pos += 1;
} else {
MB_FAILURE(pos, 1);
}
}
break;
case cs_eucjp:
{
unsigned char c = str[pos];
if (c >= 0xA1 && c <= 0xFE) {
unsigned next;
if (!CHECK_LEN(pos, 2))
MB_FAILURE(pos, 1);
next = str[pos + 1];
if (next >= 0xA1 && next <= 0xFE) {
/* this a jis kanji char */
this_char = (c << 8) | next;
} else {
MB_FAILURE(pos, (next != 0xA0 && next != 0xFF) ? 1 : 2);
}
pos += 2;
} else if (c == 0x8E) {
unsigned next;
if (!CHECK_LEN(pos, 2))
MB_FAILURE(pos, 1);
next = str[pos + 1];
if (next >= 0xA1 && next <= 0xDF) {
/* JIS X 0201 kana */
this_char = (c << 8) | next;
} else {
MB_FAILURE(pos, (next != 0xA0 && next != 0xFF) ? 1 : 2);
}
pos += 2;
} else if (c == 0x8F) {
size_t avail = str_len - pos;
if (avail < 3 || !(str[pos + 1] >= 0xA1 && str[pos + 1] <= 0xFE) ||
!(str[pos + 2] >= 0xA1 && str[pos + 2] <= 0xFE)) {
if (avail < 2 || (str[pos + 1] != 0xA0 && str[pos + 1] != 0xFF))
MB_FAILURE(pos, 1);
else if (avail < 3 || (str[pos + 2] != 0xA0 && str[pos + 2] != 0xFF))
MB_FAILURE(pos, 2);
else
MB_FAILURE(pos, 3);
} else {
/* JIS X 0212 hojo-kanji */
this_char = (c << 16) | (str[pos + 1] << 8) | str[pos + 2];
}
pos += 3;
} else if (c != 0xA0 && c != 0xFF) {
/* character encoded in 1 code unit */
this_char = c;
pos += 1;
} else {
MB_FAILURE(pos, 1);
}
}
break;
default:
/* single-byte charsets */
this_char = str[pos++];
break;
}
*cursor = pos;
return this_char;
}
/* }}} */
/* {{{ php_next_utf8_char
* Public interface for get_next_char used with UTF-8 */
PHPAPI unsigned int php_next_utf8_char(
const unsigned char *str,
size_t str_len,
size_t *cursor,
int *status)
{
return get_next_char(cs_utf_8, str, str_len, cursor, status);
}
/* }}} */
/* {{{ entity_charset determine_charset
* returns the charset identifier based on current locale or a hint.
* defaults to UTF-8 */
static enum entity_charset determine_charset(char *charset_hint)
{
size_t i;
enum entity_charset charset = cs_utf_8;
size_t len = 0;
const zend_encoding *zenc;
/* Default is now UTF-8 */
if (charset_hint == NULL)
return cs_utf_8;
if ((len = strlen(charset_hint)) != 0) {
goto det_charset;
}
zenc = zend_multibyte_get_internal_encoding();
if (zenc != NULL) {
charset_hint = (char *)zend_multibyte_get_encoding_name(zenc);
if (charset_hint != NULL && (len=strlen(charset_hint)) != 0) {
if ((len == 4) /* sizeof (auto|pass) */ &&
/* XXX should the "wchar" be ignored as well?? */
(!memcmp("pass", charset_hint, 4) ||
!memcmp("auto", charset_hint, 4))) {
charset_hint = NULL;
len = 0;
} else {
goto det_charset;
}
}
}
charset_hint = SG(default_charset);
if (charset_hint != NULL && (len=strlen(charset_hint)) != 0) {
goto det_charset;
}
/* try to detect the charset for the locale */
#if HAVE_NL_LANGINFO && HAVE_LOCALE_H && defined(CODESET)
charset_hint = nl_langinfo(CODESET);
if (charset_hint != NULL && (len=strlen(charset_hint)) != 0) {
goto det_charset;
}
#endif
#if HAVE_LOCALE_H
/* try to figure out the charset from the locale */
{
char *localename;
char *dot, *at;
/* lang[_territory][.codeset][@modifier] */
localename = setlocale(LC_CTYPE, NULL);
dot = strchr(localename, '.');
if (dot) {
dot++;
/* locale specifies a codeset */
at = strchr(dot, '@');
if (at)
len = at - dot;
else
len = strlen(dot);
charset_hint = dot;
} else {
/* no explicit name; see if the name itself
* is the charset */
charset_hint = localename;
len = strlen(charset_hint);
}
}
#endif
det_charset:
if (charset_hint) {
int found = 0;
/* now walk the charset map and look for the codeset */
for (i = 0; i < sizeof(charset_map)/sizeof(charset_map[0]); i++) {
if (len == charset_map[i].codeset_len &&
zend_binary_strcasecmp(charset_hint, len, charset_map[i].codeset, len) == 0) {
charset = charset_map[i].charset;
found = 1;
break;
}
}
if (!found) {
php_error_docref(NULL, E_WARNING, "charset `%s' not supported, assuming utf-8",
charset_hint);
}
}
return charset;
}
/* }}} */
/* {{{ php_utf32_utf8 */
static inline size_t php_utf32_utf8(unsigned char *buf, unsigned k)
{
size_t retval = 0;
/* assert(0x0 <= k <= 0x10FFFF); */
if (k < 0x80) {
buf[0] = k;
retval = 1;
} else if (k < 0x800) {
buf[0] = 0xc0 | (k >> 6);
buf[1] = 0x80 | (k & 0x3f);
retval = 2;
} else if (k < 0x10000) {
buf[0] = 0xe0 | (k >> 12);
buf[1] = 0x80 | ((k >> 6) & 0x3f);
buf[2] = 0x80 | (k & 0x3f);
retval = 3;
} else {
buf[0] = 0xf0 | (k >> 18);
buf[1] = 0x80 | ((k >> 12) & 0x3f);
buf[2] = 0x80 | ((k >> 6) & 0x3f);
buf[3] = 0x80 | (k & 0x3f);
retval = 4;
}
/* UTF-8 has been restricted to max 4 bytes since RFC 3629 */
return retval;
}
/* }}} */
/* {{{ php_mb2_int_to_char
* Convert back big endian int representation of sequence of one or two 8-bit code units. */
static inline size_t php_mb2_int_to_char(unsigned char *buf, unsigned k)
{
assert(k <= 0xFFFFU);
/* one or two bytes */
if (k <= 0xFFU) { /* 1 */
buf[0] = k;
return 1U;
} else { /* 2 */
buf[0] = k >> 8;
buf[1] = k & 0xFFU;
return 2U;
}
}
/* }}} */
/* {{{ php_mb3_int_to_char
* Convert back big endian int representation of sequence of one to three 8-bit code units.
* For EUC-JP. */
static inline size_t php_mb3_int_to_char(unsigned char *buf, unsigned k)
{
assert(k <= 0xFFFFFFU);
/* one to three bytes */
if (k <= 0xFFU) { /* 1 */
buf[0] = k;
return 1U;
} else if (k <= 0xFFFFU) { /* 2 */
buf[0] = k >> 8;
buf[1] = k & 0xFFU;
return 2U;
} else {
buf[0] = k >> 16;
buf[1] = (k >> 8) & 0xFFU;
buf[2] = k & 0xFFU;
return 3U;
}
}
/* }}} */
/* {{{ unimap_bsearc_cmp
* Binary search of unicode code points in unicode <--> charset mapping.
* Returns the code point in the target charset (whose mapping table was given) or 0 if
* the unicode code point is not in the table.
*/
static inline unsigned char unimap_bsearch(const uni_to_enc *table, unsigned code_key_a, size_t num)
{
const uni_to_enc *l = table,
*h = &table[num-1],
*m;
unsigned short code_key;
/* we have no mappings outside the BMP */
if (code_key_a > 0xFFFFU)
return 0;
code_key = (unsigned short) code_key_a;
while (l <= h) {
m = l + (h - l) / 2;
if (code_key < m->un_code_point)
h = m - 1;
else if (code_key > m->un_code_point)
l = m + 1;
else
return m->cs_code;
}
return 0;
}
/* }}} */
/* {{{ map_from_unicode */
static inline int map_from_unicode(unsigned code, enum entity_charset charset, unsigned *res)
{
unsigned char found;
const uni_to_enc *table;
size_t table_size;
switch (charset) {
case cs_8859_1:
/* identity mapping of code points to unicode */
if (code > 0xFF) {
return FAILURE;
}
*res = code;
break;
case cs_8859_5:
if (code <= 0xA0 || code == 0xAD /* soft hyphen */) {
*res = code;
} else if (code == 0x2116) {
*res = 0xF0; /* numero sign */
} else if (code == 0xA7) {
*res = 0xFD; /* section sign */
} else if (code >= 0x0401 && code <= 0x044F) {
if (code == 0x040D || code == 0x0450 || code == 0x045D)
return FAILURE;
*res = code - 0x360;
} else {
return FAILURE;
}
break;
case cs_8859_15:
if (code < 0xA4 || (code > 0xBE && code <= 0xFF)) {
*res = code;
} else { /* between A4 and 0xBE */
found = unimap_bsearch(unimap_iso885915,
code, sizeof(unimap_iso885915) / sizeof(*unimap_iso885915));
if (found)
*res = found;
else
return FAILURE;
}
break;
case cs_cp1252:
if (code <= 0x7F || (code >= 0xA0 && code <= 0xFF)) {
*res = code;
} else {
found = unimap_bsearch(unimap_win1252,
code, sizeof(unimap_win1252) / sizeof(*unimap_win1252));
if (found)
*res = found;
else
return FAILURE;
}
break;
case cs_macroman:
if (code == 0x7F)
return FAILURE;
table = unimap_macroman;
table_size = sizeof(unimap_macroman) / sizeof(*unimap_macroman);
goto table_over_7F;
case cs_cp1251:
table = unimap_win1251;
table_size = sizeof(unimap_win1251) / sizeof(*unimap_win1251);
goto table_over_7F;
case cs_koi8r:
table = unimap_koi8r;
table_size = sizeof(unimap_koi8r) / sizeof(*unimap_koi8r);
goto table_over_7F;
case cs_cp866:
table = unimap_cp866;
table_size = sizeof(unimap_cp866) / sizeof(*unimap_cp866);
table_over_7F:
if (code <= 0x7F) {
*res = code;
} else {
found = unimap_bsearch(table, code, table_size);
if (found)
*res = found;
else
return FAILURE;
}
break;
/* from here on, only map the possible characters in the ASCII range.
* to improve support here, it's a matter of building the unicode mappings.
* See <http://www.unicode.org/Public/6.0.0/ucd/Unihan.zip> */
case cs_sjis:
case cs_eucjp:
/* we interpret 0x5C as the Yen symbol. This is not universal.
* See <http://www.w3.org/Submission/japanese-xml/#ambiguity_of_yen> */
if (code >= 0x20 && code <= 0x7D) {
if (code == 0x5C)
return FAILURE;
*res = code;
} else {
return FAILURE;
}
break;
case cs_big5:
case cs_big5hkscs:
case cs_gb2312:
if (code >= 0x20 && code <= 0x7D) {
*res = code;
} else {
return FAILURE;
}
break;
default:
return FAILURE;
}
return SUCCESS;
}
/* }}} */
/* {{{ */
static inline void map_to_unicode(unsigned code, const enc_to_uni *table, unsigned *res)
{
/* only single byte encodings are currently supported; assumed code <= 0xFF */
*res = table->inner[ENT_ENC_TO_UNI_STAGE1(code)]->uni_cp[ENT_ENC_TO_UNI_STAGE2(code)];
}
/* }}} */
/* {{{ unicode_cp_is_allowed */
static inline int unicode_cp_is_allowed(unsigned uni_cp, int document_type)
{
/* XML 1.0 HTML 4.01 HTML 5
* 0x09..0x0A 0x09..0x0A 0x09..0x0A
* 0x0D 0x0D 0x0C..0x0D
* 0x0020..0xD7FF 0x20..0x7E 0x20..0x7E
* 0x00A0..0xD7FF 0x00A0..0xD7FF
* 0xE000..0xFFFD 0xE000..0x10FFFF 0xE000..0xFDCF
* 0x010000..0x10FFFF 0xFDF0..0x10FFFF (*)
*
* (*) exclude code points where ((code & 0xFFFF) >= 0xFFFE)
*
* References:
* XML 1.0: <http://www.w3.org/TR/REC-xml/#charsets>
* HTML 4.01: <http://www.w3.org/TR/1999/PR-html40-19990824/sgml/sgmldecl.html>
* HTML 5: <http://dev.w3.org/html5/spec/Overview.html#preprocessing-the-input-stream>
*
* Not sure this is the relevant part for HTML 5, though. I opted to
* disallow the characters that would result in a parse error when
* preprocessing of the input stream. See also section 8.1.3.
*
* It's unclear if XHTML 1.0 allows C1 characters. I'll opt to apply to
* XHTML 1.0 the same rules as for XML 1.0.
* See <http://cmsmcq.com/2007/C1.xml>.
*/
switch (document_type) {
case ENT_HTML_DOC_HTML401:
return (uni_cp >= 0x20 && uni_cp <= 0x7E) ||
(uni_cp == 0x0A || uni_cp == 0x09 || uni_cp == 0x0D) ||
(uni_cp >= 0xA0 && uni_cp <= 0xD7FF) ||
(uni_cp >= 0xE000 && uni_cp <= 0x10FFFF);
case ENT_HTML_DOC_HTML5:
return (uni_cp >= 0x20 && uni_cp <= 0x7E) ||
(uni_cp >= 0x09 && uni_cp <= 0x0D && uni_cp != 0x0B) || /* form feed U+0C allowed */
(uni_cp >= 0xA0 && uni_cp <= 0xD7FF) ||
(uni_cp >= 0xE000 && uni_cp <= 0x10FFFF &&
((uni_cp & 0xFFFF) < 0xFFFE) && /* last two of each plane (nonchars) disallowed */
(uni_cp < 0xFDD0 || uni_cp > 0xFDEF)); /* U+FDD0-U+FDEF (nonchars) disallowed */
case ENT_HTML_DOC_XHTML:
case ENT_HTML_DOC_XML1:
return (uni_cp >= 0x20 && uni_cp <= 0xD7FF) ||
(uni_cp == 0x0A || uni_cp == 0x09 || uni_cp == 0x0D) ||
(uni_cp >= 0xE000 && uni_cp <= 0x10FFFF && uni_cp != 0xFFFE && uni_cp != 0xFFFF);
default:
return 1;
}
}
/* }}} */
/* {{{ unicode_cp_is_allowed */
static inline int numeric_entity_is_allowed(unsigned uni_cp, int document_type)
{
/* less restrictive than unicode_cp_is_allowed */
switch (document_type) {
case ENT_HTML_DOC_HTML401:
/* all non-SGML characters (those marked with UNUSED in DESCSET) should be
* representable with numeric entities */
return uni_cp <= 0x10FFFF;
case ENT_HTML_DOC_HTML5:
/* 8.1.4. The numeric character reference forms described above are allowed to
* reference any Unicode code point other than U+0000, U+000D, permanently
* undefined Unicode characters (noncharacters), and control characters other
* than space characters (U+0009, U+000A, U+000C and U+000D) */
/* seems to allow surrogate characters, then */
return (uni_cp >= 0x20 && uni_cp <= 0x7E) ||
(uni_cp >= 0x09 && uni_cp <= 0x0C && uni_cp != 0x0B) || /* form feed U+0C allowed, but not U+0D */
(uni_cp >= 0xA0 && uni_cp <= 0x10FFFF &&
((uni_cp & 0xFFFF) < 0xFFFE) && /* last two of each plane (nonchars) disallowed */
(uni_cp < 0xFDD0 || uni_cp > 0xFDEF)); /* U+FDD0-U+FDEF (nonchars) disallowed */
case ENT_HTML_DOC_XHTML:
case ENT_HTML_DOC_XML1:
/* OTOH, XML 1.0 requires "character references to match the production for Char
* See <http://www.w3.org/TR/REC-xml/#NT-CharRef> */
return unicode_cp_is_allowed(uni_cp, document_type);
default:
return 1;
}
}
/* }}} */
/* {{{ process_numeric_entity
* Auxiliary function to traverse_for_entities.
* On input, *buf should point to the first character after # and on output, it's the last
* byte read, no matter if there was success or insuccess.
*/
static inline int process_numeric_entity(const char **buf, unsigned *code_point)
{
zend_long code_l;
int hexadecimal = (**buf == 'x' || **buf == 'X'); /* TODO: XML apparently disallows "X" */
char *endptr;
if (hexadecimal && (**buf != '\0'))
(*buf)++;
/* strtol allows whitespace and other stuff in the beginning
* we're not interested */
if ((hexadecimal && !isxdigit(**buf)) ||
(!hexadecimal && !isdigit(**buf))) {
return FAILURE;
}
code_l = ZEND_STRTOL(*buf, &endptr, hexadecimal ? 16 : 10);
/* we're guaranteed there were valid digits, so *endptr > buf */
*buf = endptr;
if (**buf != ';')
return FAILURE;
/* many more are invalid, but that depends on whether it's HTML
* (and which version) or XML. */
if (code_l > Z_L(0x10FFFF))
return FAILURE;
if (code_point != NULL)
*code_point = (unsigned)code_l;
return SUCCESS;
}
/* }}} */
/* {{{ process_named_entity */
static inline int process_named_entity_html(const char **buf, const char **start, size_t *length)
{
*start = *buf;
/* "&" is represented by a 0x26 in all supported encodings. That means
* the byte after represents a character or is the leading byte of an
* sequence of 8-bit code units. If in the ranges below, it represents
* necessarily a alpha character because none of the supported encodings
* has an overlap with ASCII in the leading byte (only on the second one) */
while ((**buf >= 'a' && **buf <= 'z') ||
(**buf >= 'A' && **buf <= 'Z') ||
(**buf >= '0' && **buf <= '9')) {
(*buf)++;
}
if (**buf != ';')
return FAILURE;
/* cast to size_t OK as the quantity is always non-negative */
*length = *buf - *start;
if (*length == 0)
return FAILURE;
return SUCCESS;
}
/* }}} */
/* {{{ resolve_named_entity_html */
static inline int resolve_named_entity_html(const char *start, size_t length, const entity_ht *ht, unsigned *uni_cp1, unsigned *uni_cp2)
{
const entity_cp_map *s;
zend_ulong hash = zend_inline_hash_func(start, length);
s = ht->buckets[hash % ht->num_elems];
while (s->entity) {
if (s->entity_len == length) {
if (memcmp(start, s->entity, length) == 0) {
*uni_cp1 = s->codepoint1;
*uni_cp2 = s->codepoint2;
return SUCCESS;
}
}
s++;
}
return FAILURE;
}
/* }}} */
static inline size_t write_octet_sequence(unsigned char *buf, enum entity_charset charset, unsigned code) {
/* code is not necessarily a unicode code point */
switch (charset) {
case cs_utf_8:
return php_utf32_utf8(buf, code);
case cs_8859_1:
case cs_cp1252:
case cs_8859_15:
case cs_koi8r:
case cs_cp1251:
case cs_8859_5:
case cs_cp866:
case cs_macroman:
/* single byte stuff */
*buf = code;
return 1;
case cs_big5:
case cs_big5hkscs:
case cs_sjis:
case cs_gb2312:
/* we don't have complete unicode mappings for these yet in entity_decode,
* and we opt to pass through the octet sequences for these in htmlentities
* instead of converting to an int and then converting back. */
#if 0
return php_mb2_int_to_char(buf, code);
#else
#if ZEND_DEBUG
assert(code <= 0xFFU);
#endif
*buf = code;
return 1;
#endif
case cs_eucjp:
#if 0 /* idem */
return php_mb2_int_to_char(buf, code);
#else
#if ZEND_DEBUG
assert(code <= 0xFFU);
#endif
*buf = code;
return 1;
#endif
default:
assert(0);
return 0;
}
}
/* {{{ traverse_for_entities
* Auxiliary function to php_unescape_html_entities().
* - The argument "all" determines if all numeric entities are decode or only those
* that correspond to quotes (depending on quote_style).
*/
/* maximum expansion (factor 1.2) for HTML 5 with ≫⃒ and ≪⃒ */
/* +2 is 1 because of rest (probably unnecessary), 1 because of terminating 0 */
#define TRAVERSE_FOR_ENTITIES_EXPAND_SIZE(oldlen) ((oldlen) + (oldlen) / 5 + 2)
static void traverse_for_entities(
const char *old,
size_t oldlen,
zend_string *ret, /* should have allocated TRAVERSE_FOR_ENTITIES_EXPAND_SIZE(olden) */
int all,
int flags,
const entity_ht *inv_map,
enum entity_charset charset)
{
const char *p,
*lim;
char *q;
int doctype = flags & ENT_HTML_DOC_TYPE_MASK;
lim = old + oldlen; /* terminator address */
assert(*lim == '\0');
for (p = old, q = ZSTR_VAL(ret); p < lim;) {
unsigned code, code2 = 0;
const char *next = NULL; /* when set, next > p, otherwise possible inf loop */
/* Shift JIS, Big5 and HKSCS use multi-byte encodings where an
* ASCII range byte can be part of a multi-byte sequence.
* However, they start at 0x40, therefore if we find a 0x26 byte,
* we're sure it represents the '&' character. */
/* assumes there are no single-char entities */
if (p[0] != '&' || (p + 3 >= lim)) {
*(q++) = *(p++);
continue;
}
/* now p[3] is surely valid and is no terminator */
/* numerical entity */
if (p[1] == '#') {
next = &p[2];
if (process_numeric_entity(&next, &code) == FAILURE)
goto invalid_code;
/* If we're in htmlspecialchars_decode, we're only decoding entities
* that represent &, <, >, " and '. Is this one of them? */
if (!all && (code > 63U ||
stage3_table_be_apos_00000[code].data.ent.entity == NULL))
goto invalid_code;
/* are we allowed to decode this entity in this document type?
* HTML 5 is the only that has a character that cannot be used in
* a numeric entity but is allowed literally (U+000D). The
* unoptimized version would be ... || !numeric_entity_is_allowed(code) */
if (!unicode_cp_is_allowed(code, doctype) ||
(doctype == ENT_HTML_DOC_HTML5 && code == 0x0D))
goto invalid_code;
} else {
const char *start;
size_t ent_len;
next = &p[1];
start = next;
if (process_named_entity_html(&next, &start, &ent_len) == FAILURE)
goto invalid_code;
if (resolve_named_entity_html(start, ent_len, inv_map, &code, &code2) == FAILURE) {
if (doctype == ENT_HTML_DOC_XHTML && ent_len == 4 && start[0] == 'a'
&& start[1] == 'p' && start[2] == 'o' && start[3] == 's') {