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html_document.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 |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Niels Dossche <[email protected]> |
+----------------------------------------------------------------------+
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "php.h"
#if defined(HAVE_LIBXML) && defined(HAVE_DOM)
#include "php_dom.h"
#include "html5_parser.h"
#include "html5_serializer.h"
#include "namespace_compat.h"
#include "dom_properties.h"
#include <Zend/zend_smart_string.h>
#include <lexbor/html/encoding.h>
#include <lexbor/encoding/encoding.h>
/* Implementation defined, but as HTML5 defaults in all other cases to UTF-8, we'll do the same. */
#define DOM_FALLBACK_ENCODING_NAME "UTF-8"
#define DOM_FALLBACK_ENCODING_ID LXB_ENCODING_UTF_8
typedef struct _dom_line_column_cache {
size_t last_line;
size_t last_column;
size_t last_offset;
} dom_line_column_cache;
typedef struct _dom_lexbor_libxml2_bridge_application_data {
const char *input_name;
const lxb_codepoint_t *current_input_codepoints;
const char *current_input_characters;
size_t current_input_length;
size_t current_total_offset;
dom_line_column_cache cache_tokenizer;
bool html_no_implied;
} dom_lexbor_libxml2_bridge_application_data;
typedef struct _dom_character_encoding_data {
const lxb_encoding_data_t *encoding_data;
size_t bom_shift;
} dom_character_encoding_data;
typedef zend_result (*dom_write_output)(void*, const char *, size_t);
typedef struct _dom_output_ctx {
const lxb_encoding_data_t *encoding_data;
const lxb_encoding_data_t *decoding_data;
lxb_encoding_encode_t *encode;
lxb_encoding_decode_t *decode;
lxb_codepoint_t *codepoints;
lxb_char_t *encoding_output;
void *output_data;
dom_write_output write_output;
} dom_output_ctx;
typedef struct _dom_decoding_encoding_ctx {
/* We can skip some conversion if the input and output encoding are both UTF-8,
* we only have to validate and substitute replacement characters */
bool fast_path; /* Put first, near the encode & decode structures, for cache locality */
lxb_encoding_encode_t encode;
lxb_encoding_decode_t decode;
const lxb_encoding_data_t *encode_data;
const lxb_encoding_data_t *decode_data;
lxb_char_t encoding_output[4096];
lxb_codepoint_t codepoints[4096];
} dom_decoding_encoding_ctx;
/* https://dom.spec.whatwg.org/#dom-document-implementation */
zend_result dom_modern_document_implementation_read(dom_object *obj, zval *retval)
{
const uint32_t PROP_INDEX = 14;
#if ZEND_DEBUG
zend_string *implementation_str = ZSTR_INIT_LITERAL("implementation", false);
const zend_property_info *prop_info = zend_get_property_info(dom_abstract_base_document_class_entry, implementation_str, 0);
zend_string_release_ex(implementation_str, false);
ZEND_ASSERT(OBJ_PROP_TO_NUM(prop_info->offset) == PROP_INDEX);
#endif
zval *cached_implementation = OBJ_PROP_NUM(&obj->std, PROP_INDEX);
if (Z_ISUNDEF_P(cached_implementation)) {
php_dom_create_implementation(cached_implementation, true);
}
ZVAL_OBJ_COPY(retval, Z_OBJ_P(cached_implementation));
return SUCCESS;
}
static void dom_decoding_encoding_ctx_init(dom_decoding_encoding_ctx *ctx)
{
ctx->encode_data = lxb_encoding_data(LXB_ENCODING_UTF_8);
ctx->decode_data = NULL;
/* Set fast path on by default so that the decoder finishing is skipped if this was never initialised properly. */
ctx->fast_path = true;
(void) lxb_encoding_encode_init(
&ctx->encode,
ctx->encode_data,
ctx->encoding_output,
sizeof(ctx->encoding_output) / sizeof(*ctx->encoding_output)
);
(void) lxb_encoding_encode_replace_set(&ctx->encode, LXB_ENCODING_REPLACEMENT_BYTES, LXB_ENCODING_REPLACEMENT_SIZE);
}
static const char *dom_lexbor_tokenizer_error_code_to_string(lxb_html_tokenizer_error_id_t id)
{
switch (id) {
case LXB_HTML_TOKENIZER_ERROR_ABCLOFEMCO: return "abrupt-closing-of-empty-comment";
case LXB_HTML_TOKENIZER_ERROR_ABDOPUID: return "abrupt-doctype-public-identifier";
case LXB_HTML_TOKENIZER_ERROR_ABDOSYID: return "abrupt-doctype-system-identifier";
case LXB_HTML_TOKENIZER_ERROR_ABOFDIINNUCHRE: return "absence-of-digits-in-numeric-character-reference";
case LXB_HTML_TOKENIZER_ERROR_CDINHTCO: return "cdata-in-html-content";
case LXB_HTML_TOKENIZER_ERROR_CHREOUUNRA: return "character-reference-outside-unicode-range";
case LXB_HTML_TOKENIZER_ERROR_COCHININST: return "control-character-in-input-stream";
case LXB_HTML_TOKENIZER_ERROR_COCHRE: return "control-character-reference";
case LXB_HTML_TOKENIZER_ERROR_ENTAWIAT: return "end-tag-with-attributes";
case LXB_HTML_TOKENIZER_ERROR_DUAT: return "duplicate-attribute";
case LXB_HTML_TOKENIZER_ERROR_ENTAWITRSO: return "end-tag-with-trailing-solidus";
case LXB_HTML_TOKENIZER_ERROR_EOBETANA: return "eof-before-tag-name";
case LXB_HTML_TOKENIZER_ERROR_EOINCD: return "eof-in-cdata";
case LXB_HTML_TOKENIZER_ERROR_EOINCO: return "eof-in-comment";
case LXB_HTML_TOKENIZER_ERROR_EOINDO: return "eof-in-doctype";
case LXB_HTML_TOKENIZER_ERROR_EOINSCHTCOLITE: return "eof-in-script-html-comment-like-text";
case LXB_HTML_TOKENIZER_ERROR_EOINTA: return "eof-in-tag";
case LXB_HTML_TOKENIZER_ERROR_INCLCO: return "incorrectly-closed-comment";
case LXB_HTML_TOKENIZER_ERROR_INOPCO: return "incorrectly-opened-comment";
case LXB_HTML_TOKENIZER_ERROR_INCHSEAFDONA: return "invalid-character-sequence-after-doctype-name";
case LXB_HTML_TOKENIZER_ERROR_INFICHOFTANA: return "invalid-first-character-of-tag-name";
case LXB_HTML_TOKENIZER_ERROR_MIATVA: return "missing-attribute-value";
case LXB_HTML_TOKENIZER_ERROR_MIDONA: return "missing-doctype-name";
case LXB_HTML_TOKENIZER_ERROR_MIDOPUID: return "missing-doctype-public-identifier";
case LXB_HTML_TOKENIZER_ERROR_MIDOSYID: return "missing-doctype-system-identifier";
case LXB_HTML_TOKENIZER_ERROR_MIENTANA: return "missing-end-tag-name";
case LXB_HTML_TOKENIZER_ERROR_MIQUBEDOPUID: return "missing-quote-before-doctype-public-identifier";
case LXB_HTML_TOKENIZER_ERROR_MIQUBEDOSYID: return "missing-quote-before-doctype-system-identifier";
case LXB_HTML_TOKENIZER_ERROR_MISEAFCHRE: return "missing-semicolon-after-character-reference";
case LXB_HTML_TOKENIZER_ERROR_MIWHAFDOPUKE: return "missing-whitespace-after-doctype-public-keyword";
case LXB_HTML_TOKENIZER_ERROR_MIWHAFDOSYKE: return "missing-whitespace-after-doctype-system-keyword";
case LXB_HTML_TOKENIZER_ERROR_MIWHBEDONA: return "missing-whitespace-before-doctype-name";
case LXB_HTML_TOKENIZER_ERROR_MIWHBEAT: return "missing-whitespace-between-attributes";
case LXB_HTML_TOKENIZER_ERROR_MIWHBEDOPUANSYID: return "missing-whitespace-between-doctype-public-and-system-identifiers";
case LXB_HTML_TOKENIZER_ERROR_NECO: return "nested-comment";
case LXB_HTML_TOKENIZER_ERROR_NOCHRE: return "noncharacter-character-reference";
case LXB_HTML_TOKENIZER_ERROR_NOININST: return "noncharacter-in-input-stream";
case LXB_HTML_TOKENIZER_ERROR_NOVOHTELSTTAWITRSO: return "non-void-html-element-start-tag-with-trailing-solidus";
case LXB_HTML_TOKENIZER_ERROR_NUCHRE: return "null-character-reference";
case LXB_HTML_TOKENIZER_ERROR_SUCHRE: return "surrogate-character-reference";
case LXB_HTML_TOKENIZER_ERROR_SUININST: return "surrogate-in-input-stream";
case LXB_HTML_TOKENIZER_ERROR_UNCHAFDOSYID: return "unexpected-character-after-doctype-system-identifier";
case LXB_HTML_TOKENIZER_ERROR_UNCHINATNA: return "unexpected-character-in-attribute-name";
case LXB_HTML_TOKENIZER_ERROR_UNCHINUNATVA: return "unexpected-character-in-unquoted-attribute-value";
case LXB_HTML_TOKENIZER_ERROR_UNEQSIBEATNA: return "unexpected-equals-sign-before-attribute-name";
case LXB_HTML_TOKENIZER_ERROR_UNNUCH: return "unexpected-null-character";
case LXB_HTML_TOKENIZER_ERROR_UNQUMAINOFTANA: return "unexpected-question-mark-instead-of-tag-name";
case LXB_HTML_TOKENIZER_ERROR_UNSOINTA: return "unexpected-solidus-in-tag";
case LXB_HTML_TOKENIZER_ERROR_UNNACHRE: return "unknown-named-character-reference";
default: return "unknown error";
}
}
static const char *dom_lexbor_tree_error_code_to_string(lxb_html_tree_error_id_t id)
{
switch (id) {
case LXB_HTML_RULES_ERROR_UNTO: return "unexpected-token";
case LXB_HTML_RULES_ERROR_UNCLTO: return "unexpected-closed-token";
case LXB_HTML_RULES_ERROR_NUCH: return "null-character";
case LXB_HTML_RULES_ERROR_UNCHTO: return "unexpected-character-token";
case LXB_HTML_RULES_ERROR_UNTOININMO: return "unexpected-token-in-initial-mode";
case LXB_HTML_RULES_ERROR_BADOTOININMO: return "bad-doctype-token-in-initial-mode";
case LXB_HTML_RULES_ERROR_DOTOINBEHTMO: return "doctype-token-in-before-html-mode";
case LXB_HTML_RULES_ERROR_UNCLTOINBEHTMO: return "unexpected-closed-token-in-before-html-mode";
case LXB_HTML_RULES_ERROR_DOTOINBEHEMO: return "doctype-token-in-before-head-mode";
case LXB_HTML_RULES_ERROR_UNCLTOINBEHEMO: return "unexpected-closed_token-in-before-head-mode";
case LXB_HTML_RULES_ERROR_DOTOINHEMO: return "doctype-token-in-head-mode";
case LXB_HTML_RULES_ERROR_NOVOHTELSTTAWITRSO: return "non-void-html-element-start-tag-with-trailing-solidus";
case LXB_HTML_RULES_ERROR_HETOINHEMO: return "head-token-in-head-mode";
case LXB_HTML_RULES_ERROR_UNCLTOINHEMO: return "unexpected-closed-token-in-head-mode";
case LXB_HTML_RULES_ERROR_TECLTOWIOPINHEMO: return "template-closed-token-without-opening-in-head-mode";
case LXB_HTML_RULES_ERROR_TEELISNOCUINHEMO: return "template-element-is-not-current-in-head-mode";
case LXB_HTML_RULES_ERROR_DOTOINHENOMO: return "doctype-token-in-head-noscript-mode";
case LXB_HTML_RULES_ERROR_DOTOAFHEMO: return "doctype-token-after-head-mode";
case LXB_HTML_RULES_ERROR_HETOAFHEMO: return "head-token-after-head-mode";
case LXB_HTML_RULES_ERROR_DOTOINBOMO: return "doctype-token-in-body-mode";
case LXB_HTML_RULES_ERROR_BAENOPELISWR: return "bad-ending-open-elements-is-wrong";
case LXB_HTML_RULES_ERROR_OPELISWR: return "open-elements-is-wrong";
case LXB_HTML_RULES_ERROR_UNELINOPELST: return "unexpected-element-in-open-elements-stack";
case LXB_HTML_RULES_ERROR_MIELINOPELST: return "missing-element-in-open-elements-stack";
case LXB_HTML_RULES_ERROR_NOBOELINSC: return "no-body-element-in-scope";
case LXB_HTML_RULES_ERROR_MIELINSC: return "missing-element-in-scope";
case LXB_HTML_RULES_ERROR_UNELINSC: return "unexpected-element-in-scope";
case LXB_HTML_RULES_ERROR_UNELINACFOST: return "unexpected-element-in-active-formatting-stack";
case LXB_HTML_RULES_ERROR_UNENOFFI: return "unexpected-end-of-file";
case LXB_HTML_RULES_ERROR_CHINTATE: return "characters-in-table-text";
case LXB_HTML_RULES_ERROR_DOTOINTAMO: return "doctype-token-in-table-mode";
case LXB_HTML_RULES_ERROR_DOTOINSEMO: return "doctype-token-in-select-mode";
case LXB_HTML_RULES_ERROR_DOTOAFBOMO: return "doctype-token-after-body-mode";
case LXB_HTML_RULES_ERROR_DOTOINFRMO: return "doctype-token-in-frameset-mode";
case LXB_HTML_RULES_ERROR_DOTOAFFRMO: return "doctype-token-after-frameset-mode";
case LXB_HTML_RULES_ERROR_DOTOFOCOMO: return "doctype-token-foreign-content-mode";
default: return "unknown error";
}
}
static const char *dom_lexbor_libxml2_bridge_status_code_to_string(lexbor_libxml2_bridge_status status)
{
switch (status) {
case LEXBOR_LIBXML2_BRIDGE_STATUS_CANNOT_INIT: return "cannot initialize data structures";
case LEXBOR_LIBXML2_BRIDGE_STATUS_FATAL_PARSE: return "fatal error in parsing";
case LEXBOR_LIBXML2_BRIDGE_STATUS_OVERFLOW: return "string length overflow";
case LEXBOR_LIBXML2_BRIDGE_STATUS_OOM: return "out of memory";
default: return "unknown error";
}
}
static void dom_reset_line_column_cache(dom_line_column_cache *cache)
{
cache->last_line = 1;
cache->last_column = 1;
cache->last_offset = 0;
}
static void dom_find_line_and_column_using_cache(
const dom_lexbor_libxml2_bridge_application_data *application_data,
dom_line_column_cache *cache,
size_t offset
)
{
offset -= application_data->current_total_offset;
if (offset > application_data->current_input_length) {
/* Possible with empty input, also just good for general safety */
offset = application_data->current_input_length;
}
size_t last_column = cache->last_column;
size_t last_line = cache->last_line;
size_t last_offset = cache->last_offset;
/* Either unicode or UTF-8 data */
if (application_data->current_input_codepoints != NULL) {
while (last_offset < offset) {
if (application_data->current_input_codepoints[last_offset] == 0x000A /* Unicode codepoint for line feed */) {
last_line++;
last_column = 1;
} else {
last_column++;
}
last_offset++;
}
} else {
while (last_offset < offset) {
const lxb_char_t current = application_data->current_input_characters[last_offset];
if (current == '\n') {
last_line++;
last_column = 1;
last_offset++;
} else {
/* See Lexbor tokenizer patch
* Note for future self: branchlessly computing the length and jumping by the length would be nice,
* however it takes so many instructions to do so that it is slower than this naive method. */
if ((current & 0b11000000) != 0b10000000) {
last_column++;
}
last_offset++;
}
}
}
cache->last_column = last_column;
cache->last_line = last_line;
cache->last_offset = last_offset;
}
static void dom_lexbor_libxml2_bridge_tokenizer_error_reporter(
void *application_data_voidptr,
lxb_html_tokenizer_error_t *error,
size_t offset
)
{
dom_lexbor_libxml2_bridge_application_data *application_data = application_data_voidptr;
dom_find_line_and_column_using_cache(application_data, &application_data->cache_tokenizer, offset);
php_libxml_pretend_ctx_error_ex(application_data->input_name, application_data->cache_tokenizer.last_line, application_data->cache_tokenizer.last_column, "tokenizer error %s in %s, line: %zu, column: %zu\n", dom_lexbor_tokenizer_error_code_to_string(error->id), application_data->input_name, application_data->cache_tokenizer.last_line, application_data->cache_tokenizer.last_column);
}
static void dom_lexbor_libxml2_bridge_tree_error_reporter(
void *application_data_voidptr,
lxb_html_tree_error_t *error,
size_t line,
size_t column,
size_t len
)
{
dom_lexbor_libxml2_bridge_application_data *application_data = application_data_voidptr;
if (line == 1 && application_data->html_no_implied && error->id == LXB_HTML_RULES_ERROR_UNTOININMO) {
/* For no implied mode, we want to mimick libxml's behaviour of not reporting an error for a lacking doctype. */
return;
}
if (len <= 1) {
/* Possible with EOF, or single-character tokens, don't use a range in the error display in this case */
php_libxml_pretend_ctx_error_ex(
application_data->input_name,
line,
column,
"tree error %s in %s, line: %zu, column: %zu\n",
dom_lexbor_tree_error_code_to_string(error->id),
application_data->input_name,
line,
column
);
} else {
php_libxml_pretend_ctx_error_ex(
application_data->input_name,
line,
column,
"tree error %s in %s, line: %zu, column: %zu-%zu\n",
dom_lexbor_tree_error_code_to_string(error->id),
application_data->input_name,
line,
column,
column + len - 1
);
}
}
static xmlNodePtr dom_search_child(xmlNodePtr parent, const char *searching_for)
{
xmlNodePtr node = parent->children;
while (node != NULL) {
if (node->type == XML_ELEMENT_NODE && strcmp((const char *) node->name, searching_for) == 0) {
return node;
}
node = node->next;
}
return NULL;
}
static void dom_place_remove_element_and_hoist_children(xmlNodePtr parent, const char *searching_for)
{
xmlNodePtr node = dom_search_child(parent, searching_for);
if (node != NULL) {
xmlUnlinkNode(node);
xmlNodePtr child = node->children;
while (child != NULL) {
xmlUnlinkNode(child);
xmlAddChild(parent, child);
child = node->children;
}
xmlFreeNode(node);
}
}
static void dom_post_process_html5_loading(
xmlDocPtr lxml_doc,
zend_long options,
const lexbor_libxml2_bridge_extracted_observations *observations
)
{
if (options & HTML_PARSE_NOIMPLIED) {
xmlNodePtr html_node = dom_search_child((xmlNodePtr) lxml_doc, "html");
if (!observations->has_explicit_head_tag) {
dom_place_remove_element_and_hoist_children(html_node, "head");
}
if (!observations->has_explicit_body_tag) {
dom_place_remove_element_and_hoist_children(html_node, "body");
}
if (!observations->has_explicit_html_tag) {
dom_place_remove_element_and_hoist_children((xmlNodePtr) lxml_doc, "html");
}
}
}
/* https://html.spec.whatwg.org/multipage/parsing.html#determining-the-character-encoding */
static dom_character_encoding_data dom_determine_encoding(const char *source, size_t source_len)
{
dom_character_encoding_data result;
/* BOM sniffing */
if (source_len >= 3 && source[0] == '\xEF' && source[1] == '\xBB' && source[2] == '\xBF') {
result.encoding_data = lxb_encoding_data(LXB_ENCODING_UTF_8);
result.bom_shift = 3;
return result;
} else if (source_len >= 2) {
if (source[0] == '\xFE' && source[1] == '\xFF') {
result.encoding_data = lxb_encoding_data(LXB_ENCODING_UTF_16BE);
result.bom_shift = 2;
return result;
} else if (source[0] == '\xFF' && source[1] == '\xFE') {
result.encoding_data = lxb_encoding_data(LXB_ENCODING_UTF_16LE);
result.bom_shift = 2;
return result;
}
}
/* Perform prescan */
lxb_html_encoding_t encoding;
lxb_status_t status = lxb_html_encoding_init(&encoding);
if (status != LXB_STATUS_OK) {
goto fallback_uninit;
}
/* This is the "wait either for 1024 bytes or 500ms" part */
if (source_len > 1024) {
source_len = 1024;
}
status = lxb_html_encoding_determine(&encoding, (const lxb_char_t *) source, (const lxb_char_t *) source + source_len);
if (status != LXB_STATUS_OK) {
goto fallback;
}
lxb_html_encoding_entry_t *entry = lxb_html_encoding_meta_entry(&encoding, 0);
if (entry == NULL) {
goto fallback;
}
result.encoding_data = lxb_encoding_data_by_pre_name(entry->name, entry->end - entry->name);
if (!result.encoding_data) {
goto fallback;
}
result.bom_shift = 0;
lxb_html_encoding_destroy(&encoding, false);
return result;
fallback:
lxb_html_encoding_destroy(&encoding, false);
fallback_uninit:
result.encoding_data = lxb_encoding_data(DOM_FALLBACK_ENCODING_ID);
result.bom_shift = 0;
return result;
}
static void dom_setup_parser_encoding_manually(const lxb_char_t *buf_start, const lxb_encoding_data_t *encoding_data, dom_decoding_encoding_ctx *decoding_encoding_ctx, dom_lexbor_libxml2_bridge_application_data *application_data)
{
static const lxb_codepoint_t replacement_codepoint = LXB_ENCODING_REPLACEMENT_CODEPOINT;
decoding_encoding_ctx->decode_data = encoding_data;
(void) lxb_encoding_decode_init(
&decoding_encoding_ctx->decode,
decoding_encoding_ctx->decode_data,
decoding_encoding_ctx->codepoints,
sizeof(decoding_encoding_ctx->codepoints) / sizeof(*decoding_encoding_ctx->codepoints)
);
(void) lxb_encoding_decode_replace_set(
&decoding_encoding_ctx->decode,
&replacement_codepoint,
LXB_ENCODING_REPLACEMENT_BUFFER_LEN
);
/* Note: encode_data is for UTF-8 */
decoding_encoding_ctx->fast_path = decoding_encoding_ctx->decode_data == decoding_encoding_ctx->encode_data;
if (decoding_encoding_ctx->fast_path) {
application_data->current_input_codepoints = NULL;
application_data->current_input_characters = (const char *) buf_start;
} else {
application_data->current_input_codepoints = decoding_encoding_ctx->codepoints;
application_data->current_input_characters = NULL;
}
}
static void dom_setup_parser_encoding_implicitly(
const lxb_char_t **buf_ref,
size_t *read,
dom_decoding_encoding_ctx *decoding_encoding_ctx,
dom_lexbor_libxml2_bridge_application_data *application_data
)
{
const char *buf_start = (const char *) *buf_ref;
dom_character_encoding_data dom_encoding_data = dom_determine_encoding(buf_start, *read);
*buf_ref += dom_encoding_data.bom_shift;
*read -= dom_encoding_data.bom_shift;
dom_setup_parser_encoding_manually((const lxb_char_t *) buf_start, dom_encoding_data.encoding_data, decoding_encoding_ctx, application_data);
}
static bool dom_process_parse_chunk(
lexbor_libxml2_bridge_parse_context *ctx,
lxb_html_document_t *document,
lxb_html_parser_t *parser,
size_t encoded_length,
const lxb_char_t *encoding_output,
size_t input_buffer_length,
size_t *tokenizer_error_offset,
size_t *tree_error_offset
)
{
dom_lexbor_libxml2_bridge_application_data *application_data = ctx->application_data;
application_data->current_input_length = input_buffer_length;
lexbor_status_t lexbor_status = lxb_html_document_parse_chunk(document, encoding_output, encoded_length);
if (UNEXPECTED(lexbor_status != LXB_STATUS_OK)) {
return false;
}
if (ctx->tokenizer_error_reporter || ctx->tree_error_reporter) {
lexbor_libxml2_bridge_report_errors(ctx, parser, encoding_output, application_data->current_total_offset, tokenizer_error_offset, tree_error_offset);
dom_find_line_and_column_using_cache(application_data, &application_data->cache_tokenizer, application_data->current_total_offset + input_buffer_length);
}
application_data->current_total_offset += input_buffer_length;
application_data->cache_tokenizer.last_offset = 0;
return true;
}
static bool dom_decode_encode_fast_path(
lexbor_libxml2_bridge_parse_context *ctx,
lxb_html_document_t *document,
lxb_html_parser_t *parser,
const lxb_char_t **buf_ref_ref,
const lxb_char_t *buf_end,
dom_decoding_encoding_ctx *decoding_encoding_ctx,
size_t *tokenizer_error_offset,
size_t *tree_error_offset
)
{
const lxb_char_t *buf_ref = *buf_ref_ref;
const lxb_char_t *last_output = buf_ref;
while (buf_ref != buf_end) {
/* Fast path converts non-validated UTF-8 -> validated UTF-8 */
if (decoding_encoding_ctx->decode.u.utf_8.need == 0 && *buf_ref < 0x80) {
/* Fast path within the fast path: try to skip non-mb bytes in bulk if we are not in a state where we
* need more UTF-8 bytes to complete a sequence.
* It might be tempting to use SIMD here, but it turns out that this is less efficient because
* we need to process the same byte multiple times sometimes when mixing ASCII with multibyte. */
buf_ref++;
continue;
}
const lxb_char_t *buf_ref_backup = buf_ref;
lxb_codepoint_t codepoint = lxb_encoding_decode_utf_8_single(&decoding_encoding_ctx->decode, &buf_ref, buf_end);
if (UNEXPECTED(codepoint > LXB_ENCODING_MAX_CODEPOINT)) {
size_t skip = buf_ref - buf_ref_backup; /* Skip invalid data, it's replaced by the UTF-8 replacement bytes */
if (!dom_process_parse_chunk(
ctx,
document,
parser,
buf_ref - last_output - skip,
last_output,
buf_ref - last_output,
tokenizer_error_offset,
tree_error_offset
)) {
goto fail_oom;
}
if (!dom_process_parse_chunk(
ctx,
document,
parser,
LXB_ENCODING_REPLACEMENT_SIZE,
LXB_ENCODING_REPLACEMENT_BYTES,
0,
tokenizer_error_offset,
tree_error_offset
)) {
goto fail_oom;
}
last_output = buf_ref;
}
}
if (buf_ref != last_output
&& !dom_process_parse_chunk(
ctx,
document,
parser,
buf_ref - last_output,
last_output,
buf_ref - last_output,
tokenizer_error_offset,
tree_error_offset
)) {
goto fail_oom;
}
*buf_ref_ref = buf_ref;
return true;
fail_oom:
*buf_ref_ref = buf_ref;
return false;
}
static bool dom_decode_encode_slow_path(
lexbor_libxml2_bridge_parse_context *ctx,
lxb_html_document_t *document,
lxb_html_parser_t *parser,
const lxb_char_t **buf_ref_ref,
const lxb_char_t *buf_end,
dom_decoding_encoding_ctx *decoding_encoding_ctx,
size_t *tokenizer_error_offset,
size_t *tree_error_offset
)
{
const lxb_char_t *buf_ref = *buf_ref_ref;
lexbor_status_t decode_status, encode_status;
do {
decode_status = decoding_encoding_ctx->decode_data->decode(&decoding_encoding_ctx->decode, &buf_ref, buf_end);
const lxb_codepoint_t *codepoints_ref = (const lxb_codepoint_t *) decoding_encoding_ctx->codepoints;
size_t decoding_buffer_used = lxb_encoding_decode_buf_used(&decoding_encoding_ctx->decode);
const lxb_codepoint_t *codepoints_end = decoding_encoding_ctx->codepoints + decoding_buffer_used;
do {
encode_status = decoding_encoding_ctx->encode_data->encode(&decoding_encoding_ctx->encode, &codepoints_ref, codepoints_end);
ZEND_ASSERT(encode_status != LXB_STATUS_ERROR && "parameters and replacements should be valid");
if (!dom_process_parse_chunk(
ctx,
document,
parser,
lxb_encoding_encode_buf_used(&decoding_encoding_ctx->encode),
decoding_encoding_ctx->encoding_output,
decoding_buffer_used,
tokenizer_error_offset,
tree_error_offset
)) {
goto fail_oom;
}
lxb_encoding_encode_buf_used_set(&decoding_encoding_ctx->encode, 0);
} while (encode_status == LXB_STATUS_SMALL_BUFFER);
lxb_encoding_decode_buf_used_set(&decoding_encoding_ctx->decode, 0);
} while (decode_status == LXB_STATUS_SMALL_BUFFER);
*buf_ref_ref = buf_ref;
return true;
fail_oom:
*buf_ref_ref = buf_ref;
return false;
}
static bool dom_parse_decode_encode_step(
lexbor_libxml2_bridge_parse_context *ctx,
lxb_html_document_t *document,
lxb_html_parser_t *parser,
const lxb_char_t **buf_ref_ref,
const lxb_char_t *buf_end,
dom_decoding_encoding_ctx *decoding_encoding_ctx,
size_t *tokenizer_error_offset,
size_t *tree_error_offset
)
{
if (decoding_encoding_ctx->fast_path) {
return dom_decode_encode_fast_path(
ctx,
document,
parser,
buf_ref_ref,
buf_end,
decoding_encoding_ctx,
tokenizer_error_offset,
tree_error_offset
);
} else {
return dom_decode_encode_slow_path(
ctx,
document,
parser,
buf_ref_ref,
buf_end,
decoding_encoding_ctx,
tokenizer_error_offset,
tree_error_offset
);
}
}
static bool dom_parse_decode_encode_finish(
lexbor_libxml2_bridge_parse_context *ctx,
lxb_html_document_t *document,
lxb_html_parser_t *parser,
dom_decoding_encoding_ctx *decoding_encoding_ctx,
size_t *tokenizer_error_offset,
size_t *tree_error_offset
)
{
if (!decoding_encoding_ctx->fast_path) {
/* Fast path handles codepoints one by one, so this part is not applicable in that case */
(void) lxb_encoding_decode_finish(&decoding_encoding_ctx->decode);
size_t decoding_buffer_size = lxb_encoding_decode_buf_used(&decoding_encoding_ctx->decode);
if (decoding_buffer_size > 0) {
const lxb_codepoint_t *codepoints_ref = (const lxb_codepoint_t *) decoding_encoding_ctx->codepoints;
const lxb_codepoint_t *codepoints_end = codepoints_ref + decoding_buffer_size;
(void) decoding_encoding_ctx->encode_data->encode(&decoding_encoding_ctx->encode, &codepoints_ref, codepoints_end);
if (!dom_process_parse_chunk(
ctx,
document,
parser,
lxb_encoding_encode_buf_used(&decoding_encoding_ctx->encode),
decoding_encoding_ctx->encoding_output,
decoding_buffer_size,
tokenizer_error_offset,
tree_error_offset
)) {
return false;
}
}
}
(void) lxb_encoding_encode_finish(&decoding_encoding_ctx->encode);
if (lxb_encoding_encode_buf_used(&decoding_encoding_ctx->encode)
&& !dom_process_parse_chunk(
ctx,
document,
parser,
lxb_encoding_encode_buf_used(&decoding_encoding_ctx->encode),
decoding_encoding_ctx->encoding_output,
lxb_encoding_decode_buf_used(&decoding_encoding_ctx->decode),
tokenizer_error_offset,
tree_error_offset
)) {
return false;
}
return true;
}
static bool check_options_validity(uint32_t arg_num, zend_long options)
{
const zend_long VALID_OPTIONS = XML_PARSE_NOERROR | XML_PARSE_COMPACT | HTML_PARSE_NOIMPLIED | DOM_HTML_NO_DEFAULT_NS;
if ((options & ~VALID_OPTIONS) != 0) {
zend_argument_value_error(arg_num, "contains invalid flags (allowed flags: "
"LIBXML_NOERROR, "
"LIBXML_COMPACT, "
"LIBXML_HTML_NOIMPLIED, "
"DOM\\NO_DEFAULT_NS)");
return false;
}
return true;
}
PHP_METHOD(DOM_HTMLDocument, createEmpty)
{
const char *encoding = "UTF-8";
size_t encoding_len = strlen("UTF-8");
if (zend_parse_parameters(ZEND_NUM_ARGS(), "|p", &encoding, &encoding_len) == FAILURE) {
RETURN_THROWS();
}
const lxb_encoding_data_t *encoding_data = lxb_encoding_data_by_name((const lxb_char_t *) encoding, encoding_len);
if (encoding_data == NULL) {
zend_argument_value_error(1, "must be a valid document encoding");
RETURN_THROWS();
}
xmlDocPtr lxml_doc = php_dom_create_html_doc();
if (UNEXPECTED(lxml_doc == NULL)) {
goto oom;
}
lxml_doc->encoding = xmlStrdup((const xmlChar *) encoding);
dom_object *intern = php_dom_instantiate_object_helper(
return_value,
dom_html_document_class_entry,
(xmlNodePtr) lxml_doc,
NULL
);
intern->document->class_type = PHP_LIBXML_CLASS_MODERN;
intern->document->private_data = php_dom_libxml_ns_mapper_header(php_dom_libxml_ns_mapper_create());
return;
oom:
php_dom_throw_error(INVALID_STATE_ERR, true);
RETURN_THROWS();
}
/* Only bother to register error handling when the error reports can become observable. */
static bool dom_should_register_error_handlers(zend_long options)
{
if (options & XML_PARSE_NOERROR) {
return false;
}
return php_libxml_uses_internal_errors() || ((EG(error_reporting) | EG(user_error_handler_error_reporting)) & E_WARNING);
}
PHP_METHOD(DOM_HTMLDocument, createFromString)
{
const char *source, *override_encoding = NULL;
size_t source_len, override_encoding_len;
zend_long options = 0;
if (zend_parse_parameters(
ZEND_NUM_ARGS(),
"s|lp!",
&source,
&source_len,
&options,
&override_encoding,
&override_encoding_len
) == FAILURE) {
RETURN_THROWS();
}
if (!check_options_validity(2, options)) {
RETURN_THROWS();
}
dom_lexbor_libxml2_bridge_application_data application_data;
application_data.input_name = "Entity";
application_data.current_total_offset = 0;
application_data.html_no_implied = options & HTML_PARSE_NOIMPLIED;
dom_reset_line_column_cache(&application_data.cache_tokenizer);
lexbor_libxml2_bridge_parse_context ctx;
lexbor_libxml2_bridge_parse_context_init(&ctx);
if (dom_should_register_error_handlers(options)) {
lexbor_libxml2_bridge_parse_set_error_callbacks(
&ctx,
dom_lexbor_libxml2_bridge_tokenizer_error_reporter,
dom_lexbor_libxml2_bridge_tree_error_reporter
);
}
ctx.application_data = &application_data;
size_t tokenizer_error_offset = 0;
size_t tree_error_offset = 0;
/* Setup everything encoding & decoding related */
const lxb_char_t *buf_ref = (const lxb_char_t *) source;
dom_decoding_encoding_ctx decoding_encoding_ctx;
dom_decoding_encoding_ctx_init(&decoding_encoding_ctx);
if (override_encoding != NULL) {
const lxb_encoding_data_t *encoding_data = lxb_encoding_data_by_name(
(const lxb_char_t *) override_encoding,
override_encoding_len
);
if (!encoding_data) {
zend_argument_value_error(3, "must be a valid document encoding");
RETURN_THROWS();
}
dom_setup_parser_encoding_manually(buf_ref, encoding_data, &decoding_encoding_ctx, &application_data);
} else {
dom_setup_parser_encoding_implicitly(&buf_ref, &source_len, &decoding_encoding_ctx, &application_data);
}
lxb_html_document_t *document = lxb_html_document_create();
if (UNEXPECTED(document == NULL)) {
goto fail_oom;
}
lxb_status_t lexbor_status = lxb_html_document_parse_chunk_begin(document);
if (UNEXPECTED(lexbor_status != LXB_STATUS_OK)) {
goto fail_oom;
}
lxb_html_parser_t *parser = document->dom_document.parser;
while (source_len > 0) {
size_t chunk_size = source_len;
const size_t MAX_CHUNK_SIZE = sizeof(decoding_encoding_ctx.encoding_output) / sizeof(*decoding_encoding_ctx.encoding_output);
if (chunk_size > MAX_CHUNK_SIZE) {
chunk_size = MAX_CHUNK_SIZE;
}
source_len -= chunk_size;
const lxb_char_t *buf_end = buf_ref + chunk_size;
bool result = dom_parse_decode_encode_step(
&ctx,
document,
parser,
&buf_ref,
buf_end,
&decoding_encoding_ctx,
&tokenizer_error_offset,
&tree_error_offset
);
if (!result) {
goto fail_oom;
}
}
if (!dom_parse_decode_encode_finish(&ctx, document, parser, &decoding_encoding_ctx, &tokenizer_error_offset, &tree_error_offset)) {
goto fail_oom;
}
lexbor_status = lxb_html_document_parse_chunk_end(document);
if (lexbor_status != LXB_STATUS_OK) {
goto fail_oom;
}
php_dom_libxml_ns_mapper *ns_mapper = php_dom_libxml_ns_mapper_create();
xmlDocPtr lxml_doc;
lexbor_libxml2_bridge_status bridge_status = lexbor_libxml2_bridge_convert_document(
document,
&lxml_doc,
options & XML_PARSE_COMPACT,
!(options & DOM_HTML_NO_DEFAULT_NS),
ns_mapper
);
lexbor_libxml2_bridge_copy_observations(parser->tree, &ctx.observations);
if (UNEXPECTED(bridge_status != LEXBOR_LIBXML2_BRIDGE_STATUS_OK)) {
php_dom_libxml_ns_mapper_destroy(ns_mapper);
php_libxml_ctx_error(
NULL,
"%s in %s",
dom_lexbor_libxml2_bridge_status_code_to_string(bridge_status),
application_data.input_name
);
lxb_html_document_destroy(document);
RETURN_FALSE;
}
lxb_html_document_destroy(document);
dom_post_process_html5_loading(lxml_doc, options, &ctx.observations);
if (decoding_encoding_ctx.decode_data) {
lxml_doc->encoding = xmlStrdup((const xmlChar *) decoding_encoding_ctx.decode_data->name);
} else {
lxml_doc->encoding = xmlStrdup((const xmlChar *) "UTF-8");
}
dom_object *intern = php_dom_instantiate_object_helper(
return_value,
dom_html_document_class_entry,
(xmlNodePtr) lxml_doc,
NULL
);
intern->document->class_type = PHP_LIBXML_CLASS_MODERN;
intern->document->private_data = php_dom_libxml_ns_mapper_header(ns_mapper);
return;
fail_oom:
lxb_html_document_destroy(document);
php_dom_throw_error(INVALID_STATE_ERR, true);
RETURN_THROWS();
}
PHP_METHOD(DOM_HTMLDocument, createFromFile)
{
const char *filename, *override_encoding = NULL;
php_dom_libxml_ns_mapper *ns_mapper = NULL;
size_t filename_len, override_encoding_len;
zend_long options = 0;
php_stream *stream = NULL;
if (zend_parse_parameters(
ZEND_NUM_ARGS(),
"p|lp!",
&filename,
&filename_len,
&options,
&override_encoding,
&override_encoding_len
) == FAILURE) {
RETURN_THROWS();
}
/* See php_libxml_streams_IO_open_wrapper(), apparently this caused issues in the past. */
if (strstr(filename, "%00")) {
zend_argument_value_error(1, "must not contain percent-encoded NUL bytes");
RETURN_THROWS();
}
if (!check_options_validity(2, options)) {
RETURN_THROWS();
}
dom_lexbor_libxml2_bridge_application_data application_data;
application_data.input_name = filename;
application_data.current_total_offset = 0;
application_data.html_no_implied = options & HTML_PARSE_NOIMPLIED;
dom_reset_line_column_cache(&application_data.cache_tokenizer);
lexbor_libxml2_bridge_parse_context ctx;
lexbor_libxml2_bridge_parse_context_init(&ctx);
if (dom_should_register_error_handlers(options)) {
lexbor_libxml2_bridge_parse_set_error_callbacks(
&ctx,
dom_lexbor_libxml2_bridge_tokenizer_error_reporter,
dom_lexbor_libxml2_bridge_tree_error_reporter
);
}
ctx.application_data = &application_data;
char buf[4096];
/* Setup everything encoding & decoding related */
dom_decoding_encoding_ctx decoding_encoding_ctx;
dom_decoding_encoding_ctx_init(&decoding_encoding_ctx);
bool should_determine_encoding_implicitly = true; /* First read => determine encoding implicitly */
if (override_encoding != NULL) {
const lxb_encoding_data_t *encoding_data = lxb_encoding_data_by_name(
(const lxb_char_t *) override_encoding,
override_encoding_len
);
if (!encoding_data) {
zend_argument_value_error(3, "must be a valid document encoding");
RETURN_THROWS();
}
should_determine_encoding_implicitly = false;
dom_setup_parser_encoding_manually((const lxb_char_t *) buf, encoding_data, &decoding_encoding_ctx, &application_data);
}
zend_string *opened_path = NULL;
stream = php_stream_open_wrapper_ex(filename, "rb", REPORT_ERRORS, &opened_path, php_libxml_get_stream_context());
if (!stream) {
if (!EG(exception)) {
zend_throw_exception_ex(NULL, 0, "Cannot open file '%s'", filename);
}
RETURN_THROWS();
}