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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/wtf/text/utf8.h"
#include <vector>
#include "testing/gtest/include/gtest/gtest.h"
namespace blink::unicode {
TEST(Utf8Test, ConvertUtf8ToUtf16) {
// A newly created buffer is legal.
std::vector<uint8_t> legal_str = {'a', 'b', 'c'};
UChar result_buffer[3];
auto result = ConvertUtf8ToUtf16(legal_str, result_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(3u, result.converted.size());
EXPECT_EQ(std::vector<UChar>({'a', 'b', 'c'}), result.converted);
// All subsequent chars in a sequence must be >= 0x80.
std::vector<uint8_t> illegal_str = {0xF4, 0x66, 0x88, 0x8C};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// A subsequent char after F4 must be <= 0x8F.
illegal_str = {0xF4, 0x90, 0x88, 0x8C};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// All subsequent chars in a sequence must be >= 0x80.
illegal_str = {0xE1, 0x11, 0x88};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// A subsequent char after 0xED must be <= 0x9F.
illegal_str = {0xED, 0xA0, 0x88};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// A length 1 unicode character >= 128 that looks like
// a multibyte sequence should return not enough source.
illegal_str = {0b11110001};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
// A length 1 unicode character >= 128 but less than the first multibyte value
// should be illegal.
illegal_str = {0b10111111};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Valid 2-byte sequence.
legal_str = {0xC2, 0xA2}; // ¢
result = ConvertUtf8ToUtf16(legal_str, result_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(std::vector<UChar>({0x00A2}), result.converted);
// Valid 3-byte sequence.
legal_str = {0xE2, 0x82, 0xAC}; // €
result = ConvertUtf8ToUtf16(legal_str, result_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(std::vector<UChar>({0x20AC}), result.converted);
// Valid 4-byte sequence.
legal_str = {0xF0, 0x9F, 0x98, 0x81}; // 😁
result = ConvertUtf8ToUtf16(legal_str, result_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(std::vector<UChar>({0xD83D, 0xDE01}), result.converted);
// Invalid 2-byte sequence (second byte missing).
illegal_str = {0xC2};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
// Invalid 2-byte sequence (second byte has wrong format).
illegal_str = {0xC2, 0x20};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Invalid 3-byte sequence (second byte missing).
illegal_str = {0xE2, 0x82};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
// Invalid 3-byte sequence (third byte missing).
illegal_str = {0xE2};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
// Invalid 3-byte sequence (second byte has wrong format).
illegal_str = {0xE2, 0x20, 0xAC};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Invalid 3-byte sequence (third byte has wrong format).
illegal_str = {0xE2, 0x82, 0x20};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Invalid 4-byte sequence (second byte missing).
illegal_str = {0xF0, 0x9F, 0x98};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
// Invalid 4-byte sequence (third byte missing).
illegal_str = {0xF0, 0x9F};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
// Invalid 4-byte sequence (fourth byte missing).
illegal_str = {0xF0};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
// Invalid 4-byte sequence (second byte has wrong format).
illegal_str = {0xF0, 0x20, 0x98, 0x81};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Invalid 4-byte sequence (third byte has wrong format).
illegal_str = {0xF0, 0x9F, 0x20, 0x81};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Invalid 4-byte sequence (fourth byte has wrong format).
illegal_str = {0xF0, 0x9F, 0x98, 0x20};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Overlong encoding of a character (2 bytes for a 1-byte char).
illegal_str = {0xC0, 0x81};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Overlong encoding of a character (3 bytes for a 1-byte char).
illegal_str = {0xE0, 0x80, 0x81};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Overlong encoding of a character (4 bytes for a 1-byte char).
illegal_str = {0xF0, 0x80, 0x80, 0x81};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Overlong encoding of a character (3 bytes for a 2-byte char).
illegal_str = {0xE0, 0x82, 0xA2};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Overlong encoding of a character (4 bytes for a 2-byte char).
illegal_str = {0xF0, 0x80, 0x82, 0xA2};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Overlong encoding of a character (4 bytes for a 3-byte char).
illegal_str = {0xF0, 0x82, 0x82, 0xAC};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Invalid byte 0xC0.
illegal_str = {0xC0};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
// Invalid byte 0xC1.
illegal_str = {0xC1};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
// Invalid bytes 0xF5 and above.
illegal_str = {0xF5, 0x81, 0x81, 0x81};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
illegal_str = {0xFF, 0x81, 0x81, 0x81};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// An unpaired high surrogate should fail.
illegal_str = {0xED, 0xA0, 0x80, 0x01};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// An unpaired low surrogate should fail.
illegal_str = {0xED, 0xB0, 0x80, 0x01};
result = ConvertUtf8ToUtf16(illegal_str, result_buffer);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Target buffer too small.
std::vector<uint8_t> long_input('a', 20);
result = ConvertUtf8ToUtf16(long_input, result_buffer);
EXPECT_EQ(blink::unicode::kTargetExhausted, result.status);
EXPECT_EQ(3u, result.converted.size());
}
TEST(Utf8Test, ConvertLatin1ToUtf8) {
// Valid Latin-1 string.
std::vector<LChar> legal_str = {'a', 'b', 'c', 0xA2, 0xAC};
std::vector<uint8_t> result_buffer(10);
auto result = ConvertLatin1ToUtf8(legal_str, result_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(7u, result.converted.size());
const std::vector<uint8_t> expected1 = {'a', 'b', 'c', 0xC2,
0xA2, 0xC2, 0xAC};
EXPECT_EQ(expected1, result.converted);
// Target buffer too small.
std::vector<uint8_t> small_buffer(6);
result = ConvertLatin1ToUtf8(legal_str, small_buffer);
EXPECT_EQ(blink::unicode::kTargetExhausted, result.status);
EXPECT_EQ(5u, result.converted.size());
// High-bit characters.
std::vector<LChar> high_bit_str = {0xFF, 0xFE, 0xFD};
std::vector<uint8_t> high_bit_buffer(6);
result = ConvertLatin1ToUtf8(high_bit_str, high_bit_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(6u, result.converted.size());
const std::vector<uint8_t> expected3 = {0xC3, 0xBF, 0xC3, 0xBE, 0xC3, 0xBD};
EXPECT_EQ(expected3, result.converted);
// Empty string.
result = ConvertLatin1ToUtf8(std::vector<LChar>(), result_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(std::vector<uint8_t>(), result.converted);
}
TEST(Utf8Test, CalculateStringLengthFromUtf8) {
bool seen_non_ascii;
bool seen_non_latin1;
// Empty string
EXPECT_EQ(0u,
CalculateStringLengthFromUtf8({}, seen_non_ascii, seen_non_latin1));
EXPECT_FALSE(seen_non_ascii);
EXPECT_FALSE(seen_non_latin1);
// All ASCII
std::vector<uint8_t> ascii_str = {'a', 'b', 'c'};
EXPECT_EQ(3u, CalculateStringLengthFromUtf8(ascii_str, seen_non_ascii,
seen_non_latin1));
EXPECT_FALSE(seen_non_ascii);
EXPECT_FALSE(seen_non_latin1);
// Latin-1
std::vector<uint8_t> latin1_str = {'a', 'b', 0xC2, 0xA2};
EXPECT_EQ(3u, CalculateStringLengthFromUtf8(latin1_str, seen_non_ascii,
seen_non_latin1));
EXPECT_TRUE(seen_non_ascii);
EXPECT_FALSE(seen_non_latin1);
// Non-Latin-1 UTF-8
std::vector<uint8_t> utf8_str = {0xE2, 0x82, 0xAC}; // €
EXPECT_EQ(1u, CalculateStringLengthFromUtf8(utf8_str, seen_non_ascii,
seen_non_latin1));
EXPECT_TRUE(seen_non_ascii);
EXPECT_TRUE(seen_non_latin1);
// Mixed
std::vector<uint8_t> mixed_str = {'a', 0xC2, 0xA2, 0xE2, 0x82, 0xAC};
EXPECT_EQ(3u, CalculateStringLengthFromUtf8(mixed_str, seen_non_ascii,
seen_non_latin1));
EXPECT_TRUE(seen_non_ascii);
EXPECT_TRUE(seen_non_latin1);
// Surrogate pair
std::vector<uint8_t> surrogate_pair = {0xF0, 0x9F, 0x98, 0x81};
EXPECT_EQ(2u, CalculateStringLengthFromUtf8(surrogate_pair, seen_non_ascii,
seen_non_latin1));
EXPECT_TRUE(seen_non_ascii);
EXPECT_TRUE(seen_non_latin1);
// Invalid UTF-8
std::vector<uint8_t> invalid_str = {0xC2};
EXPECT_EQ(0u, CalculateStringLengthFromUtf8(invalid_str, seen_non_ascii,
seen_non_latin1));
// Truncated UTF-8
std::vector<uint8_t> truncated_str = {0xE2, 0x82};
EXPECT_EQ(0u, CalculateStringLengthFromUtf8(truncated_str, seen_non_ascii,
seen_non_latin1));
}
TEST(Utf8Test, ConvertUtf16ToUtf8) {
// Empty string
std::vector<UChar> empty_str = {};
std::vector<uint8_t> empty_buffer(1);
auto result = ConvertUtf16ToUtf8(empty_str, empty_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(0u, result.converted.size());
// All ASCII
std::vector<UChar> ascii_str = {'a', 'b', 'c'};
std::vector<uint8_t> ascii_buffer(3);
result = ConvertUtf16ToUtf8(ascii_str, ascii_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(std::vector<uint8_t>({'a', 'b', 'c'}), result.converted);
// BMP characters
std::vector<UChar> bmp_str = {0x00A2, 0x20AC}; // ¢€
std::vector<uint8_t> bmp_buffer(5);
result = ConvertUtf16ToUtf8(bmp_str, bmp_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(std::vector<uint8_t>({0xC2, 0xA2, 0xE2, 0x82, 0xAC}),
result.converted);
// Supplementary plane characters (surrogate pairs)
std::vector<UChar> supplementary_str = {0xD83D, 0xDE01}; // 😁
std::vector<uint8_t> supplementary_buffer(4);
result = ConvertUtf16ToUtf8(supplementary_str, supplementary_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(std::vector<uint8_t>({0xF0, 0x9F, 0x98, 0x81}), result.converted);
// Mixed
std::vector<UChar> mixed_str = {'a', 0x00A2, 0xD83D, 0xDE01};
std::vector<uint8_t> mixed_buffer(7);
result = ConvertUtf16ToUtf8(mixed_str, mixed_buffer);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(std::vector<uint8_t>({'a', 0xC2, 0xA2, 0xF0, 0x9F, 0x98, 0x81}),
result.converted);
// Target buffer too small
std::vector<uint8_t> small_buffer(6);
result = ConvertUtf16ToUtf8(mixed_str, small_buffer);
EXPECT_EQ(blink::unicode::kTargetExhausted, result.status);
EXPECT_EQ(std::vector<uint8_t>({'a', 0xC2, 0xA2}), result.converted);
// Invalid surrogate pair (strict)
std::vector<UChar> invalid_str = {0xD83D, 'a'};
std::vector<uint8_t> invalid_buffer(4);
result = ConvertUtf16ToUtf8(invalid_str, invalid_buffer, true);
EXPECT_EQ(blink::unicode::kSourceIllegal, result.status);
// Invalid surrogate pair (non-strict)
result = ConvertUtf16ToUtf8(invalid_str, invalid_buffer, false);
EXPECT_EQ(blink::unicode::kConversionOK, result.status);
EXPECT_EQ(4u, result.converted.size());
EXPECT_EQ(std::vector<uint8_t>({0xED, 0xA0, 0xBD, 'a'}), result.converted);
// Lone high surrogate at the end of the input.
std::vector<UChar> lone_surrogate_str = {0xD83D};
result = ConvertUtf16ToUtf8(lone_surrogate_str, invalid_buffer, true);
EXPECT_EQ(blink::unicode::kSourceExhausted, result.status);
}
} // namespace blink::unicode
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