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Add support for numeric XML entities to XMLParser #47978

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Jun 3, 2021
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Add support for numeric XML entities to XMLParser #47978

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69 changes: 3 additions & 66 deletions core/io/xml_parser.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -36,63 +36,6 @@

VARIANT_ENUM_CAST(XMLParser::NodeType);

static bool _equalsn(const CharType *str1, const CharType *str2, int len) {
int i;
for (i = 0; i < len && str1[i] && str2[i]; ++i) {
if (str1[i] != str2[i]) {
return false;
}
}

// if one (or both) of the strings was smaller then they
// are only equal if they have the same length
return (i == len) || (str1[i] == 0 && str2[i] == 0);
}

String XMLParser::_replace_special_characters(const String &origstr) {
int pos = origstr.find("&");
int oldPos = 0;

if (pos == -1) {
return origstr;
}

String newstr;

while (pos != -1 && pos < origstr.length() - 2) {
// check if it is one of the special characters

int specialChar = -1;
for (int i = 0; i < (int)special_characters.size(); ++i) {
const CharType *p = &origstr[pos] + 1;

if (_equalsn(&special_characters[i][1], p, special_characters[i].length() - 1)) {
specialChar = i;
break;
}
}

if (specialChar != -1) {
newstr += (origstr.substr(oldPos, pos - oldPos));
newstr += (special_characters[specialChar][0]);
pos += special_characters[specialChar].length();
} else {
newstr += (origstr.substr(oldPos, pos - oldPos + 1));
pos += 1;
}

// find next &
oldPos = pos;
pos = origstr.find("&", pos);
}

if (oldPos < origstr.length() - 1) {
newstr += (origstr.substr(oldPos, origstr.length() - oldPos));
}

return newstr;
}

static inline bool _is_white_space(char c) {
return (c == ' ' || c == '\t' || c == '\n' || c == '\r');
}
Expand All @@ -116,7 +59,7 @@ bool XMLParser::_set_text(char *start, char *end) {

// set current text to the parsed text, and replace xml special characters
String s = String::utf8(start, (int)(end - start));
node_name = _replace_special_characters(s);
node_name = s.xml_unescape();

// current XML node type is text
node_type = NODE_TEXT;
Expand Down Expand Up @@ -321,7 +264,7 @@ void XMLParser::_parse_opening_xml_element() {
String s = String::utf8(attributeValueBegin,
(int)(attributeValueEnd - attributeValueBegin));

attr.value = _replace_special_characters(s);
attr.value = s.xml_unescape();
attributes.push_back(attr);
} else {
// tag is closed directly
Expand Down Expand Up @@ -579,14 +522,8 @@ int XMLParser::get_current_line() const {
}

XMLParser::XMLParser() {
data = nullptr;
close();
special_characters.push_back("&amp;");
special_characters.push_back("<lt;");
special_characters.push_back(">gt;");
special_characters.push_back("\"quot;");
special_characters.push_back("'apos;");
}

XMLParser::~XMLParser() {
if (data) {
memdelete_arr(data);
Expand Down
15 changes: 6 additions & 9 deletions core/io/xml_parser.h
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Expand Up @@ -65,15 +65,13 @@ class XMLParser : public Reference {
};

private:
char *data;
char *P;
uint64_t length;
void unescape(String &p_str);
Vector<String> special_characters;
char *data = nullptr;
char *P = nullptr;
uint64_t length = 0;
String node_name;
bool node_empty;
NodeType node_type;
uint64_t node_offset;
bool node_empty = false;
NodeType node_type = NODE_NONE;
uint64_t node_offset = 0;

struct Attribute {
String name;
Expand All @@ -82,7 +80,6 @@ class XMLParser : public Reference {

Vector<Attribute> attributes;

String _replace_special_characters(const String &origstr);
bool _set_text(char *start, char *end);
void _parse_closing_xml_element();
void _ignore_definition();
Expand Down
63 changes: 46 additions & 17 deletions core/ustring.cpp
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Expand Up @@ -3549,29 +3549,58 @@ static _FORCE_INLINE_ int _xml_unescape(const CharType *p_src, int p_src_len, Ch

if (p_src_len >= 4 && p_src[1] == '#') {
CharType c = 0;

for (int i = 2; i < p_src_len; i++) {
eat = i + 1;
CharType ct = p_src[i];
if (ct == ';') {
break;
} else if (ct >= '0' && ct <= '9') {
ct = ct - '0';
} else if (ct >= 'a' && ct <= 'f') {
ct = (ct - 'a') + 10;
} else if (ct >= 'A' && ct <= 'F') {
ct = (ct - 'A') + 10;
} else {
continue;
bool overflow = false;
if (p_src[2] == 'x') {
// Hex entity &#x<num>;
for (int i = 3; i < p_src_len; i++) {
eat = i + 1;
CharType ct = p_src[i];
if (ct == ';') {
break;
} else if (ct >= '0' && ct <= '9') {
ct = ct - '0';
} else if (ct >= 'a' && ct <= 'f') {
ct = (ct - 'a') + 10;
} else if (ct >= 'A' && ct <= 'F') {
ct = (ct - 'A') + 10;
} else {
break;
}
if (c > (WCHAR_MAX >> 4)) {
overflow = true;
break;
}
c <<= 4;
c |= ct;
}
} else {
// Decimal entity &#<num>;
for (int i = 2; i < p_src_len; i++) {
eat = i + 1;
CharType ct = p_src[i];
if (ct == ';' || ct < '0' || ct > '9') {
break;
}
}
if (p_src[eat - 1] == ';') {
int64_t val = String::to_int(p_src + 2, eat - 3);
if (val > 0 && val <= WCHAR_MAX) {
c = (CharType)val;
} else {
overflow = true;
}
}
c <<= 4;
c |= ct;
}

// Value must be non-zero, in the range of char32_t,
// actually end with ';'. If invalid, leave the entity as-is
if (c == '\0' || overflow || p_src[eat - 1] != ';') {
eat = 1;
c = *p_src;
}
if (p_dst) {
*p_dst = c;
}

} else if (p_src_len >= 4 && p_src[1] == 'g' && p_src[2] == 't' && p_src[3] == ';') {
if (p_dst) {
*p_dst = '>';
Expand Down
6 changes: 6 additions & 0 deletions main/tests/test_main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,7 @@
#include "test_render.h"
#include "test_shader_lang.h"
#include "test_string.h"
#include "test_xml_parser.h"

const char **tests_get_names() {
static const char *test_names[] = {
Expand All @@ -65,6 +66,7 @@ const char **tests_get_names() {
"gd_bytecode",
"ordered_hash_map",
"astar",
"xml_parser",
nullptr
};

Expand Down Expand Up @@ -138,6 +140,10 @@ MainLoop *test_main(String p_test, const List<String> &p_args) {
return TestAStar::test();
}

if (p_test == "xml_parser") {
return TestXMLParser::test();
}

print_line("Unknown test: " + p_test);
return nullptr;
}
Expand Down
40 changes: 40 additions & 0 deletions main/tests/test_string.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1123,6 +1123,45 @@ bool test_35() {
return state;
}

bool test_36() {
#define CHECK(X) \
if (!(X)) { \
OS::get_singleton()->print("\tFAIL at %s\n", #X); \
return false; \
} else { \
OS::get_singleton()->print("\tPASS\n"); \
}
OS::get_singleton()->print("\n\nTest 36: xml unescape\n");
// Named entities
String input = "&quot;&amp;&apos;&lt;&gt;";
CHECK(input.xml_unescape() == "\"&\'<>");

// Numeric entities
input = "&#x41;&#66;";
CHECK(input.xml_unescape() == "AB");

input = "&#0;&x#0;More text";
String result = input.xml_unescape();
// Didn't put in a leading NUL and terminate the string
CHECK(input.length() > 0);
CHECK(input[0] != '\0');
// Entity should be left as-is if invalid
CHECK(input.xml_unescape() == input);

// Shouldn't consume without ending in a ';'
input = "&#66";
CHECK(input.xml_unescape() == input);
input = "&#x41";
CHECK(input.xml_unescape() == input);

// Invalid characters should make the entity ignored
input = "&#x41SomeIrrelevantText;";
CHECK(input.xml_unescape() == input);
input = "&#66SomeIrrelevantText;";
CHECK(input.xml_unescape() == input);
return true;
}

typedef bool (*TestFunc)();

TestFunc test_funcs[] = {
Expand Down Expand Up @@ -1162,6 +1201,7 @@ TestFunc test_funcs[] = {
test_33,
test_34,
test_35,
test_36,
nullptr

};
Expand Down
109 changes: 109 additions & 0 deletions main/tests/test_xml_parser.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,109 @@
/*************************************************************************/
/* test_xml_parser.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/

#include "test_xml_parser.h"

#include "core/os/os.h"

namespace TestXMLParser {
#define CHECK(X) \
if (!(X)) { \
OS::get_singleton()->print("\tFAIL at %s\n", #X); \
return false; \
} else { \
OS::get_singleton()->print("\tPASS\n"); \
}
bool test_1() {
String source = "<?xml version = \"1.0\" encoding=\"UTF-8\" ?>\
<top attr=\"attr value\">\
Text&lt;&#65;&#x42;&gt;\
</top>";
Vector<uint8_t> buff;
for (int i = 0; i < source.length(); i++) {
buff.push_back(source.get(i));
}
XMLParser parser;
parser.open_buffer(buff);

// <?xml ...?> gets parsed as NODE_UNKNOWN
CHECK(parser.read() == OK);
CHECK(parser.get_node_type() == XMLParser::NodeType::NODE_UNKNOWN);

CHECK(parser.read() == OK);
CHECK(parser.get_node_type() == XMLParser::NodeType::NODE_ELEMENT);
CHECK(parser.get_node_name() == "top");
CHECK(parser.has_attribute("attr"));
CHECK(parser.get_attribute_value("attr") == "attr value");

CHECK(parser.read() == OK);
CHECK(parser.get_node_type() == XMLParser::NodeType::NODE_TEXT);
CHECK(parser.get_node_data().lstrip(" \t") == "Text<AB>");

CHECK(parser.read() == OK);
CHECK(parser.get_node_type() == XMLParser::NodeType::NODE_ELEMENT_END);
CHECK(parser.get_node_name() == "top");

parser.close();
return true;
}

typedef bool (*TestFunc)();
TestFunc test_funcs[] = {
test_1,
nullptr
};

MainLoop *test() {
int count = 0;
int passed = 0;

while (true) {
if (!test_funcs[count]) {
break;
}
bool pass = test_funcs[count]();
if (pass) {
passed++;
}
OS::get_singleton()->print("\t%s\n", pass ? "PASS" : "FAILED");

count++;
}

OS::get_singleton()->print("\n\n\n");
OS::get_singleton()->print("*************\n");
OS::get_singleton()->print("***TOTALS!***\n");
OS::get_singleton()->print("*************\n");

OS::get_singleton()->print("Passed %i of %i tests\n", passed, count);

return nullptr;
}
} // namespace TestXMLParser
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