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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "third_party/blink/renderer/platform/wtf/text/string_hasher.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/renderer/platform/wtf/text/case_folding_hash.h"
#include "third_party/blink/renderer/platform/wtf/text/convert_to_8bit_hash_reader.h"
namespace WTF {
namespace {
const char kNullLChars[1] = {0};
const UChar kNullUChars[1] = {0};
const uint64_t kEmptyStringHash = 0x5A6EF77074EBC84B;
const uint64_t kSingleNullCharacterHash = 0x48DFCE108249B3F8;
const LChar kTestALChars[5] = {0x41, 0x95, 0xFF, 0x50, 0x01};
const UChar kTestAUChars[5] = {0x41, 0x95, 0xFF, 0x50, 0x01};
const UChar kTestBUChars[5] = {0x41, 0x95, 0xFFFF, 0x1080, 0x01};
const uint64_t kTestAHash = 0xE9422771E0A5DDE6;
const uint64_t kTestBHash = 0x4A2DA770EEA75C1E;
} // anonymous namespace
TEST(StringHasherTest, StringHasher_ComputeHashAndMaskTop8Bits) {
EXPECT_EQ(kEmptyStringHash & 0xFFFFFF,
StringHasher::ComputeHashAndMaskTop8Bits(nullptr, 0));
EXPECT_EQ(kEmptyStringHash & 0xFFFFFF,
StringHasher::ComputeHashAndMaskTop8Bits(kNullLChars, 0));
EXPECT_EQ(kEmptyStringHash & 0xFFFFFF,
StringHasher::ComputeHashAndMaskTop8Bits<ConvertTo8BitHashReader>(
nullptr, 0));
EXPECT_EQ(kEmptyStringHash & 0xFFFFFF,
StringHasher::ComputeHashAndMaskTop8Bits<ConvertTo8BitHashReader>(
(const char*)kNullUChars, 0));
EXPECT_EQ(kSingleNullCharacterHash & 0xFFFFFF,
StringHasher::ComputeHashAndMaskTop8Bits(kNullLChars, 1));
EXPECT_EQ(kSingleNullCharacterHash & 0xFFFFFF,
StringHasher::ComputeHashAndMaskTop8Bits<ConvertTo8BitHashReader>(
(const char*)kNullUChars, 1));
EXPECT_EQ(kTestAHash & 0xFFFFFF, StringHasher::ComputeHashAndMaskTop8Bits(
(const char*)kTestALChars, 5));
EXPECT_EQ(kTestAHash & 0xFFFFFF,
StringHasher::ComputeHashAndMaskTop8Bits<ConvertTo8BitHashReader>(
(const char*)kTestAUChars, 5));
EXPECT_EQ(kTestBHash & 0xFFFFFF, StringHasher::ComputeHashAndMaskTop8Bits(
(const char*)kTestBUChars, 10));
// Test a slightly longer case (including characters that fit in Latin1
// but not in ASCII).
const char kStr[] = "A quick browñ föx jumps over thé lazy dog";
UChar kWideStr[sizeof(kStr)];
for (unsigned i = 0; i < sizeof(kStr); ++i) {
kWideStr[i] = static_cast<uint8_t>(kStr[i]);
}
EXPECT_EQ(StringHasher::ComputeHashAndMaskTop8Bits(kStr, strlen(kStr)),
StringHasher::ComputeHashAndMaskTop8Bits<ConvertTo8BitHashReader>(
(const char*)kWideStr, strlen(kStr)));
EXPECT_NE(StringHasher::ComputeHashAndMaskTop8Bits(kStr, strlen(kStr)),
StringHasher::ComputeHashAndMaskTop8Bits((const char*)kWideStr,
strlen(kStr)));
EXPECT_NE(StringHasher::ComputeHashAndMaskTop8Bits(kStr, strlen(kStr)),
StringHasher::ComputeHashAndMaskTop8Bits((const char*)kWideStr,
strlen(kStr) * 2));
}
TEST(StringHasherTest, StringHasher_HashMemory) {
EXPECT_EQ(kEmptyStringHash, StringHasher::HashMemory({}));
EXPECT_EQ(kEmptyStringHash, StringHasher::HashMemory(
base::as_byte_span(kNullUChars).first(0u)));
EXPECT_EQ(
kSingleNullCharacterHash,
StringHasher::HashMemory(base::as_byte_span(kNullUChars).first(1u)));
EXPECT_EQ(kTestAHash, StringHasher::HashMemory(kTestALChars));
EXPECT_EQ(kTestBHash,
StringHasher::HashMemory(base::as_byte_span(kTestBUChars)));
}
TEST(StringHasherTest, CaseFoldingHash) {
EXPECT_NE(CaseFoldingHash::GetHash("foo"), CaseFoldingHash::GetHash("bar"));
EXPECT_EQ(CaseFoldingHash::GetHash("foo"), CaseFoldingHash::GetHash("FOO"));
EXPECT_EQ(CaseFoldingHash::GetHash("foo"), CaseFoldingHash::GetHash("Foo"));
EXPECT_EQ(CaseFoldingHash::GetHash("Longer string 123"),
CaseFoldingHash::GetHash("longEr String 123"));
EXPECT_EQ(CaseFoldingHash::GetHash(String::FromUTF8("Ünicode")),
CaseFoldingHash::GetHash(String::FromUTF8("ünicode")));
}
TEST(StringHasherTest, ContractionAndExpansion) {
// CaseFoldingHash is the only current reader using the expansion logic,
// so we use it to test that the expansion logic is correct for various sizes;
// we don't really use the case folding itself here. We make a string that's
// long enough that we will hit most of the paths.
String str =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_!?'$";
for (unsigned i = 0; i < str.length(); ++i) {
String s8 = str.Substring(0, i);
String s16 = s8;
s16.Ensure16Bit();
EXPECT_EQ(CaseFoldingHash::GetHash(s8), CaseFoldingHash::GetHash(s16));
EXPECT_EQ(WTF::GetHash(s8), WTF::GetHash(s16));
}
}
} // namespace WTF
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