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Improved decoding of UTF-16 surrogate pairs (closes #1157)

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This commit is contained in:
Kay Sievers
2020-01-02 13:14:02 +01:00
committed by Benoit Blanchon
parent 8550418875
commit 91b808381e
5 changed files with 36 additions and 13 deletions
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5
CHANGELOG.md
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@@ -7,7 +7,10 @@ HEAD
* Added `BasicJsonDocument::shrinkToFit()`
* Added support of `uint8_t` for `serializeJson()`, `serializeJsonPretty()`, and `serializeMsgPack()` (issue #1142)
* Auto enable support for `std::string` and `std::stream` on modern compilers (issue #1156)
No need to define `ARDUINOJSON_ENABLE_STD_STRING` and `ARDUINOJSON_ENABLE_STD_STREAM`.
(No need to define `ARDUINOJSON_ENABLE_STD_STRING` and `ARDUINOJSON_ENABLE_STD_STREAM` anymore)
* Improved decoding of UTF-16 surrogate pairs (PR #1157 by @kaysievers)
(ArduinoJson now produces standard UTF-8 instead of CESU-8)
v6.13.0 (2019-11-01)
-------

7
extras/tests/JsonDeserializer/invalid_input.cpp
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@@ -7,9 +7,10 @@
#include <catch.hpp>
TEST_CASE("Invalid JSON input") {
const char* testCases[] = {"'\\u'", "'\\u000g'", "'\\u000'", "'\\u000G'",
"'\\u000/'", "\\x1234", "6a9", "1,",
"2]", "3}"};
const char* testCases[] = {
"'\\u'", "'\\u000g'", "'\\u000'", "'\\u000G'", "'\\ud83d\\ud83d'",
"'\\udda4'", "'\\ud83d_'", "'\\u000/'", "\\x1234", "6a9",
"1,", "2]", "3}"};
const size_t testCount = sizeof(testCases) / sizeof(testCases[0]);
DynamicJsonDocument doc(4096);

8
extras/tests/JsonDeserializer/string.cpp
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@@ -17,10 +17,10 @@ TEST_CASE("Valid JSON strings value") {
{"\'hello world\'", "hello world"},
{"\"1\\\"2\\\\3\\/4\\b5\\f6\\n7\\r8\\t9\"", "1\"2\\3/4\b5\f6\n7\r8\t9"},
{"'\\u0041'", "A"},
{"'\\u00e4'", "\xc3\xa4"}, // ä
{"'\\u00E4'", "\xc3\xa4"}, // ä
{"'\\u3042'", "\xe3\x81\x82"}, // あ
{"'\\u00e4'", "\xc3\xa4"}, // ä
{"'\\u00E4'", "\xc3\xa4"}, // ä
{"'\\u3042'", "\xe3\x81\x82"}, // あ
{"'\\ud83d\\udda4'", "\xf0\x9f\x96\xa4"}, // 🖤
};
const size_t testCount = sizeof(testCases) / sizeof(testCases[0]);

17
src/ArduinoJson/Json/JsonDeserializer.hpp
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@@ -189,6 +189,7 @@ class JsonDeserializer {
DeserializationError parseQuotedString(const char *&result) {
StringBuilder builder = _stringStorage.startString();
uint16_t surrogate1 = 0;
const char stopChar = current();
move();
@@ -208,7 +209,19 @@ class JsonDeserializer {
move();
DeserializationError err = parseCodepoint(codepoint);
if (err) return err;
Utf8::encodeCodepoint(codepoint, builder);
if (codepoint >= 0xd800 && codepoint <= 0xdbff) {
if (surrogate1 > 0) return DeserializationError::InvalidInput;
surrogate1 = codepoint;
} else if (codepoint >= 0xdc00 && codepoint <= 0xdfff) {
if (surrogate1 == 0) return DeserializationError::InvalidInput;
uint32_t codepoint32 = 0x10000;
codepoint32 += static_cast<uint32_t>(surrogate1 - 0xd800) << 10;
codepoint32 += codepoint - 0xdc00;
Utf8::encodeCodepoint(codepoint32, builder);
surrogate1 = 0;
} else {
Utf8::encodeCodepoint(codepoint, builder);
}
continue;
#else
return DeserializationError::NotSupported;
@@ -220,6 +233,8 @@ class JsonDeserializer {
move();
}
if (surrogate1 > 0) return DeserializationError::InvalidInput;
builder.append(c);
}

12
src/ArduinoJson/Json/Utf8.hpp
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@@ -10,17 +10,21 @@ namespace ARDUINOJSON_NAMESPACE {
namespace Utf8 {
template <typename TStringBuilder>
inline void encodeCodepoint(uint16_t codepoint, TStringBuilder &str) {
inline void encodeCodepoint(uint32_t codepoint, TStringBuilder &str) {
if (codepoint < 0x80) {
str.append(char(codepoint));
return;
}
if (codepoint >= 0x00000800) {
if (codepoint < 0x00000800) {
str.append(char(0xc0 /*0b11000000*/ | (codepoint >> 6)));
} else if (codepoint < 0x00010000) {
str.append(char(0xe0 /*0b11100000*/ | (codepoint >> 12)));
str.append(char(((codepoint >> 6) & 0x3f /*0b00111111*/) | 0x80));
} else {
str.append(char(0xc0 /*0b11000000*/ | (codepoint >> 6)));
} else if (codepoint < 0x00110000) {
str.append(char(0xf0 /*0b11110000*/ | (codepoint >> 18)));
str.append(char(((codepoint >> 12) & 0x3f /*0b00111111*/) | 0x80));
str.append(char(((codepoint >> 6) & 0x3f /*0b00111111*/) | 0x80));
}
str.append(char((codepoint & 0x3f /*0b00111111*/) | 0x80));
}