Apply clang-format with Chromium-style without column limit.

third_party/WebKit/Source/wtf/text/UTF8.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
  *
  * 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
@@ skipping 16 matching lines @@
 #include "config.h"
 #include "wtf/text/UTF8.h"
 
 #include "wtf/ASCIICType.h"
 #include "wtf/StringHasher.h"
 #include "wtf/text/CharacterNames.h"
 
 namespace WTF {
 namespace Unicode {
 
-inline int inlineUTF8SequenceLengthNonASCII(char b0)
-{
-    if ((b0 & 0xC0) != 0xC0)
-        return 0;
-    if ((b0 & 0xE0) == 0xC0)
-        return 2;
-    if ((b0 & 0xF0) == 0xE0)
-        return 3;
-    if ((b0 & 0xF8) == 0xF0)
-        return 4;
+inline int inlineUTF8SequenceLengthNonASCII(char b0) {
+  if ((b0 & 0xC0) != 0xC0)
     return 0;
+  if ((b0 & 0xE0) == 0xC0)
+    return 2;
+  if ((b0 & 0xF0) == 0xE0)
+    return 3;
+  if ((b0 & 0xF8) == 0xF0)
+    return 4;
+  return 0;
 }
 
-inline int inlineUTF8SequenceLength(char b0)
-{
-    return isASCII(b0) ? 1 : inlineUTF8SequenceLengthNonASCII(b0);
+inline int inlineUTF8SequenceLength(char b0) {
+  return isASCII(b0) ? 1 : inlineUTF8SequenceLengthNonASCII(b0);
 }
 
 // Once the bits are split out into bytes of UTF-8, this is a mask OR-ed
 // into the first byte, depending on how many bytes follow.  There are
 // as many entries in this table as there are UTF-8 sequence types.
 // (I.e., one byte sequence, two byte... etc.). Remember that sequences
 // for *legal* UTF-8 will be 4 or fewer bytes total.
-static const unsigned char firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
+static const unsigned char firstByteMark[7] = {0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC};
 
 ConversionResult convertLatin1ToUTF8(
-    const LChar** sourceStart, const LChar* sourceEnd,
-    char** targetStart, char* targetEnd)
-{
-    ConversionResult result = conversionOK;
-    const LChar* source = *sourceStart;
-    char* target = *targetStart;
-    while (source < sourceEnd) {
-        UChar32 ch;
-        unsigned short bytesToWrite = 0;
-        const UChar32 byteMask = 0xBF;
-        const UChar32 byteMark = 0x80;
-        const LChar* oldSource = source; // In case we have to back up because of target overflow.
-        ch = static_cast<unsigned short>(*source++);
-
-        // Figure out how many bytes the result will require
-        if (ch < (UChar32)0x80)
-            bytesToWrite = 1;
-        else
-            bytesToWrite = 2;
-
-        target += bytesToWrite;
-        if (target > targetEnd) {
-            source = oldSource; // Back up source pointer!
-            target -= bytesToWrite;
-            result = targetExhausted;
-            break;
+    const LChar** sourceStart,
+    const LChar* sourceEnd,
+    char** targetStart,
+    char* targetEnd) {
+  ConversionResult result = conversionOK;
+  const LChar* source = *sourceStart;
+  char* target = *targetStart;
+  while (source < sourceEnd) {
+    UChar32 ch;
+    unsigned short bytesToWrite = 0;
+    const UChar32 byteMask = 0xBF;
+    const UChar32 byteMark = 0x80;
+    const LChar* oldSource = source;  // In case we have to back up because of target overflow.
+    ch = static_cast<unsigned short>(*source++);
+
+    // Figure out how many bytes the result will require
+    if (ch < (UChar32)0x80)
+      bytesToWrite = 1;
+    else
+      bytesToWrite = 2;
+
+    target += bytesToWrite;
+    if (target > targetEnd) {
+      source = oldSource;  // Back up source pointer!
+      target -= bytesToWrite;
+      result = targetExhausted;
+      break;
+    }
+    switch (bytesToWrite) {  // note: everything falls through.
+      case 2:
+        *--target = (char)((ch | byteMark) & byteMask);
+        ch >>= 6;
+      case 1:
+        *--target = (char)(ch | firstByteMark[bytesToWrite]);
+    }
+    target += bytesToWrite;
+  }
+  *sourceStart = source;
+  *targetStart = target;
+  return result;
+}
+
+ConversionResult convertUTF16ToUTF8(
+    const UChar** sourceStart,
+    const UChar* sourceEnd,
+    char** targetStart,
+    char* targetEnd,
+    bool strict) {
+  ConversionResult result = conversionOK;
+  const UChar* source = *sourceStart;
+  char* target = *targetStart;
+  while (source < sourceEnd) {
+    UChar32 ch;
+    unsigned short bytesToWrite = 0;
+    const UChar32 byteMask = 0xBF;
+    const UChar32 byteMark = 0x80;
+    const UChar* oldSource = source;  // In case we have to back up because of target overflow.
+    ch = static_cast<unsigned short>(*source++);
+    // If we have a surrogate pair, convert to UChar32 first.
+    if (ch >= 0xD800 && ch <= 0xDBFF) {
+      // If the 16 bits following the high surrogate are in the source buffer...
+      if (source < sourceEnd) {
+        UChar32 ch2 = static_cast<unsigned short>(*source);
+        // If it's a low surrogate, convert to UChar32.
+        if (ch2 >= 0xDC00 && ch2 <= 0xDFFF) {
+          ch = ((ch - 0xD800) << 10) + (ch2 - 0xDC00) + 0x0010000;
+          ++source;
+        } else if (strict) {  // it's an unpaired high surrogate
+          --source;           // return to the illegal value itself
+          result = sourceIllegal;
+          break;
         }
-        switch (bytesToWrite) { // note: everything falls through.
-        case 2:
-            *--target = (char)((ch | byteMark) & byteMask);
-            ch >>= 6;
-        case 1:
-            *--target =  (char)(ch | firstByteMark[bytesToWrite]);
-        }
-        target += bytesToWrite;
-    }
-    *sourceStart = source;
-    *targetStart = target;
-    return result;
-}
-
-ConversionResult convertUTF16ToUTF8(
-    const UChar** sourceStart, const UChar* sourceEnd,
-    char** targetStart, char* targetEnd, bool strict)
-{
-    ConversionResult result = conversionOK;
-    const UChar* source = *sourceStart;
-    char* target = *targetStart;
-    while (source < sourceEnd) {
-        UChar32 ch;
-        unsigned short bytesToWrite = 0;
-        const UChar32 byteMask = 0xBF;
-        const UChar32 byteMark = 0x80;
-        const UChar* oldSource = source; // In case we have to back up because of target overflow.
-        ch = static_cast<unsigned short>(*source++);
-        // If we have a surrogate pair, convert to UChar32 first.
-        if (ch >= 0xD800 && ch <= 0xDBFF) {
-            // If the 16 bits following the high surrogate are in the source buffer...
-            if (source < sourceEnd) {
-                UChar32 ch2 = static_cast<unsigned short>(*source);
-                // If it's a low surrogate, convert to UChar32.
-                if (ch2 >= 0xDC00 && ch2 <= 0xDFFF) {
-                    ch = ((ch - 0xD800) << 10) + (ch2 - 0xDC00) + 0x0010000;
-                    ++source;
-                } else if (strict) { // it's an unpaired high surrogate
-                    --source; // return to the illegal value itself
-                    result = sourceIllegal;
-                    break;
-                }
-            } else { // We don't have the 16 bits following the high surrogate.
-                --source; // return to the high surrogate
-                result = sourceExhausted;
-                break;
-            }
-        } else if (strict) {
-            // UTF-16 surrogate values are illegal in UTF-32
-            if (ch >= 0xDC00 && ch <= 0xDFFF) {
-                --source; // return to the illegal value itself
-                result = sourceIllegal;
-                break;
-            }
-        }
-        // Figure out how many bytes the result will require
-        if (ch < (UChar32)0x80) {
-            bytesToWrite = 1;
-        } else if (ch < (UChar32)0x800) {
-            bytesToWrite = 2;
-        } else if (ch < (UChar32)0x10000) {
-            bytesToWrite = 3;
-        } else if (ch < (UChar32)0x110000) {
-            bytesToWrite = 4;
-        } else {
-            bytesToWrite = 3;
-            ch = replacementCharacter;
-        }
-
-        target += bytesToWrite;
-        if (target > targetEnd) {
-            source = oldSource; // Back up source pointer!
-            target -= bytesToWrite;
-            result = targetExhausted;
-            break;
-        }
-        switch (bytesToWrite) { // note: everything falls through.
-        case 4:
-            *--target = (char)((ch | byteMark) & byteMask);
-            ch >>= 6;
-        case 3:
-            *--target = (char)((ch | byteMark) & byteMask);
-            ch >>= 6;
-        case 2:
-            *--target = (char)((ch | byteMark) & byteMask);
-            ch >>= 6;
-        case 1:
-            *--target =  (char)(ch | firstByteMark[bytesToWrite]);
-        }
-        target += bytesToWrite;
-    }
-    *sourceStart = source;
-    *targetStart = target;
-    return result;
+      } else {     // We don't have the 16 bits following the high surrogate.
+        --source;  // return to the high surrogate
+        result = sourceExhausted;
+        break;
+      }
+    } else if (strict) {
+      // UTF-16 surrogate values are illegal in UTF-32
+      if (ch >= 0xDC00 && ch <= 0xDFFF) {
+        --source;  // return to the illegal value itself
+        result = sourceIllegal;
+        break;
+      }
+    }
+    // Figure out how many bytes the result will require
+    if (ch < (UChar32)0x80) {
+      bytesToWrite = 1;
+    } else if (ch < (UChar32)0x800) {
+      bytesToWrite = 2;
+    } else if (ch < (UChar32)0x10000) {
+      bytesToWrite = 3;
+    } else if (ch < (UChar32)0x110000) {
+      bytesToWrite = 4;
+    } else {
+      bytesToWrite = 3;
+      ch = replacementCharacter;
+    }
+
+    target += bytesToWrite;
+    if (target > targetEnd) {
+      source = oldSource;  // Back up source pointer!
+      target -= bytesToWrite;
+      result = targetExhausted;
+      break;
+    }
+    switch (bytesToWrite) {  // note: everything falls through.
+      case 4:
+        *--target = (char)((ch | byteMark) & byteMask);
+        ch >>= 6;
+      case 3:
+        *--target = (char)((ch | byteMark) & byteMask);
+        ch >>= 6;
+      case 2:
+        *--target = (char)((ch | byteMark) & byteMask);
+        ch >>= 6;
+      case 1:
+        *--target = (char)(ch | firstByteMark[bytesToWrite]);
+    }
+    target += bytesToWrite;
+  }
+  *sourceStart = source;
+  *targetStart = target;
+  return result;
 }
 
 // This must be called with the length pre-determined by the first byte.
 // If presented with a length > 4, this returns false.  The Unicode
 // definition of UTF-8 goes up to 4-byte sequences.
-static bool isLegalUTF8(const unsigned char* source, int length)
-{
-    unsigned char a;
-    const unsigned char* srcptr = source + length;
-    switch (length) {
+static bool isLegalUTF8(const unsigned char* source, int length) {
+  unsigned char a;
+  const unsigned char* srcptr = source + length;
+  switch (length) {
     default:
-        return false;
+      return false;
     // Everything else falls through when "true"...
     case 4:
-        if ((a = (*--srcptr)) < 0x80 || a > 0xBF)
-            return false;
+      if ((a = (*--srcptr)) < 0x80 || a > 0xBF)
+        return false;
     case 3:
-        if ((a = (*--srcptr)) < 0x80 || a > 0xBF)
-            return false;
+      if ((a = (*--srcptr)) < 0x80 || a > 0xBF)
+        return false;
     case 2:
-        if ((a = (*--srcptr)) > 0xBF)
-            return false;
-
-        // no fall-through in this inner switch
-        switch (*source) {
+      if ((a = (*--srcptr)) > 0xBF)
+        return false;
+
+      // no fall-through in this inner switch
+      switch (*source) {
         case 0xE0:
-            if (a < 0xA0)
-                return false;
-            break;
+          if (a < 0xA0)
+            return false;
+          break;
         case 0xED:
-            if (a > 0x9F)
-                return false;
-            break;
+          if (a > 0x9F)
+            return false;
+          break;
         case 0xF0:
-            if (a < 0x90)
-                return false;
-            break;
+          if (a < 0x90)
+            return false;
+          break;
         case 0xF4:
-            if (a > 0x8F)
-                return false;
-            break;
+          if (a > 0x8F)
+            return false;
+          break;
         default:
-            if (a < 0x80)
-                return false;
-        }
+          if (a < 0x80)
+            return false;
+      }
 
     case 1:
-        if (*source >= 0x80 && *source < 0xC2)
-            return false;
-    }
-    if (*source > 0xF4)
-        return false;
-    return true;
+      if (*source >= 0x80 && *source < 0xC2)
+        return false;
+  }
+  if (*source > 0xF4)
+    return false;
+  return true;
 }
 
 // Magic values subtracted from a buffer value during UTF8 conversion.
 // This table contains as many values as there might be trailing bytes
 // in a UTF-8 sequence.
-static const UChar32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL, 0x03C82080UL, static_cast<UChar32>(0xFA082080UL), static_cast<UChar32>(0x82082080UL) };
-
-static inline UChar32 readUTF8Sequence(const char*& sequence, unsigned length)
-{
-    UChar32 character = 0;
-
-    // The cases all fall through.
-    switch (length) {
+static const UChar32 offsetsFromUTF8[6] = {0x00000000UL, 0x00003080UL, 0x000E2080UL, 0x03C82080UL, static_cast<UChar32>(0xFA082080UL), static_cast<UChar32>(0x82082080UL)};
+
+static inline UChar32 readUTF8Sequence(const char*& sequence, unsigned length) {
+  UChar32 character = 0;
+
+  // The cases all fall through.
+  switch (length) {
     case 6:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
+      character += static_cast<unsigned char>(*sequence++);
+      character <<= 6;
     case 5:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
+      character += static_cast<unsigned char>(*sequence++);
+      character <<= 6;
     case 4:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
+      character += static_cast<unsigned char>(*sequence++);
+      character <<= 6;
     case 3:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
+      character += static_cast<unsigned char>(*sequence++);
+      character <<= 6;
     case 2:
-        character += static_cast<unsigned char>(*sequence++);
-        character <<= 6;
+      character += static_cast<unsigned char>(*sequence++);
+      character <<= 6;
     case 1:
-        character += static_cast<unsigned char>(*sequence++);
-    }
-
-    return character - offsetsFromUTF8[length - 1];
+      character += static_cast<unsigned char>(*sequence++);
+  }
+
+  return character - offsetsFromUTF8[length - 1];
 }
 
 ConversionResult convertUTF8ToUTF16(
-    const char** sourceStart, const char* sourceEnd,
-    UChar** targetStart, UChar* targetEnd, bool* sourceAllASCII, bool strict)
-{
-    ConversionResult result = conversionOK;
-    const char* source = *sourceStart;
-    UChar* target = *targetStart;
-    UChar orAllData = 0;
-    while (source < sourceEnd) {
-        int utf8SequenceLength = inlineUTF8SequenceLength(*source);
-        if (sourceEnd - source < utf8SequenceLength)  {
-            result = sourceExhausted;
-            break;
+    const char** sourceStart,
+    const char* sourceEnd,
+    UChar** targetStart,
+    UChar* targetEnd,
+    bool* sourceAllASCII,
+    bool strict) {
+  ConversionResult result = conversionOK;
+  const char* source = *sourceStart;
+  UChar* target = *targetStart;
+  UChar orAllData = 0;
+  while (source < sourceEnd) {
+    int utf8SequenceLength = inlineUTF8SequenceLength(*source);
+    if (sourceEnd - source < utf8SequenceLength) {
+      result = sourceExhausted;
+      break;
+    }
+    // Do this check whether lenient or strict
+    if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(source), utf8SequenceLength)) {
+      result = sourceIllegal;
+      break;
+    }
+
+    UChar32 character = readUTF8Sequence(source, utf8SequenceLength);
+
+    if (target >= targetEnd) {
+      source -= utf8SequenceLength;  // Back up source pointer!
+      result = targetExhausted;
+      break;
+    }
+
+    if (U_IS_BMP(character)) {
+      // UTF-16 surrogate values are illegal in UTF-32
+      if (U_IS_SURROGATE(character)) {
+        if (strict) {
+          source -= utf8SequenceLength;  // return to the illegal value itself
+          result = sourceIllegal;
+          break;
         }
-        // Do this check whether lenient or strict
-        if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(source), utf8SequenceLength)) {
-            result = sourceIllegal;
-            break;
-        }
-
-        UChar32 character = readUTF8Sequence(source, utf8SequenceLength);
-
-        if (target >= targetEnd) {
-            source -= utf8SequenceLength; // Back up source pointer!
-            result = targetExhausted;
-            break;
-        }
-
-        if (U_IS_BMP(character)) {
-            // UTF-16 surrogate values are illegal in UTF-32
-            if (U_IS_SURROGATE(character)) {
-                if (strict) {
-                    source -= utf8SequenceLength; // return to the illegal value itself
-                    result = sourceIllegal;
-                    break;
-                }
-                *target++ = replacementCharacter;
-                orAllData |= replacementCharacter;
-            } else {
-                *target++ = static_cast<UChar>(character); // normal case
-                orAllData |= character;
-            }
-        } else if (U_IS_SUPPLEMENTARY(character)) {
-            // target is a character in range 0xFFFF - 0x10FFFF
-            if (target + 1 >= targetEnd) {
-                source -= utf8SequenceLength; // Back up source pointer!
-                result = targetExhausted;
-                break;
-            }
-            *target++ = U16_LEAD(character);
-            *target++ = U16_TRAIL(character);
-            orAllData = 0xffff;
-        } else {
-            if (strict) {
-                source -= utf8SequenceLength; // return to the start
-                result = sourceIllegal;
-                break; // Bail out; shouldn't continue
-            } else {
-                *target++ = replacementCharacter;
-                orAllData |= replacementCharacter;
-            }
-        }
-    }
-    *sourceStart = source;
-    *targetStart = target;
-
-    if (sourceAllASCII)
-        *sourceAllASCII = !(orAllData & ~0x7f);
-
-    return result;
-}
-
-unsigned calculateStringHashAndLengthFromUTF8MaskingTop8Bits(const char* data, const char* dataEnd, unsigned& dataLength, unsigned& utf16Length)
-{
-    if (!data)
+        *target++ = replacementCharacter;
+        orAllData |= replacementCharacter;
+      } else {
+        *target++ = static_cast<UChar>(character);  // normal case
+        orAllData |= character;
+      }
+    } else if (U_IS_SUPPLEMENTARY(character)) {
+      // target is a character in range 0xFFFF - 0x10FFFF
+      if (target + 1 >= targetEnd) {
+        source -= utf8SequenceLength;  // Back up source pointer!
+        result = targetExhausted;
+        break;
+      }
+      *target++ = U16_LEAD(character);
+      *target++ = U16_TRAIL(character);
+      orAllData = 0xffff;
+    } else {
+      if (strict) {
+        source -= utf8SequenceLength;  // return to the start
+        result = sourceIllegal;
+        break;  // Bail out; shouldn't continue
+      } else {
+        *target++ = replacementCharacter;
+        orAllData |= replacementCharacter;
+      }
+    }
+  }
+  *sourceStart = source;
+  *targetStart = target;
+
+  if (sourceAllASCII)
+    *sourceAllASCII = !(orAllData & ~0x7f);
+
+  return result;
+}
+
+unsigned calculateStringHashAndLengthFromUTF8MaskingTop8Bits(const char* data, const char* dataEnd, unsigned& dataLength, unsigned& utf16Length) {
+  if (!data)
+    return 0;
+
+  StringHasher stringHasher;
+  dataLength = 0;
+  utf16Length = 0;
+
+  while (data < dataEnd || (!dataEnd && *data)) {
+    if (isASCII(*data)) {
+      stringHasher.addCharacter(*data++);
+      dataLength++;
+      utf16Length++;
+      continue;
+    }
+
+    int utf8SequenceLength = inlineUTF8SequenceLengthNonASCII(*data);
+    dataLength += utf8SequenceLength;
+
+    if (!dataEnd) {
+      for (int i = 1; i < utf8SequenceLength; ++i) {
+        if (!data[i])
+          return 0;
+      }
+    } else if (dataEnd - data < utf8SequenceLength) {
+      return 0;
+    }
+
+    if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(data), utf8SequenceLength))
+      return 0;
+
+    UChar32 character = readUTF8Sequence(data, utf8SequenceLength);
+    ASSERT(!isASCII(character));
+
+    if (U_IS_BMP(character)) {
+      // UTF-16 surrogate values are illegal in UTF-32
+      if (U_IS_SURROGATE(character))
         return 0;
-
-    StringHasher stringHasher;
-    dataLength = 0;
-    utf16Length = 0;
-
-    while (data < dataEnd || (!dataEnd && *data)) {
-        if (isASCII(*data)) {
-            stringHasher.addCharacter(*data++);
-            dataLength++;
-            utf16Length++;
-            continue;
-        }
-
-        int utf8SequenceLength = inlineUTF8SequenceLengthNonASCII(*data);
-        dataLength += utf8SequenceLength;
-
-        if (!dataEnd) {
-            for (int i = 1; i < utf8SequenceLength; ++i) {
-                if (!data[i])
-                    return 0;
-            }
-        } else if (dataEnd - data < utf8SequenceLength) {
-            return 0;
-        }
-
-        if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(data), utf8SequenceLength))
-            return 0;
-
-        UChar32 character = readUTF8Sequence(data, utf8SequenceLength);
-        ASSERT(!isASCII(character));
-
-        if (U_IS_BMP(character)) {
-            // UTF-16 surrogate values are illegal in UTF-32
-            if (U_IS_SURROGATE(character))
-                return 0;
-            stringHasher.addCharacter(static_cast<UChar>(character)); // normal case
-            utf16Length++;
-        } else if (U_IS_SUPPLEMENTARY(character)) {
-            stringHasher.addCharacters(static_cast<UChar>(U16_LEAD(character)), static_cast<UChar>(U16_TRAIL(character)));
-            utf16Length += 2;
-        } else {
-            return 0;
-        }
-    }
-
-    return stringHasher.hashWithTop8BitsMasked();
-}
-
-template<typename CharType>
-ALWAYS_INLINE bool equalWithUTF8Internal(const CharType* a, const CharType* aEnd, const char* b, const char* bEnd)
-{
-    while (b < bEnd) {
-        if (isASCII(*b)) {
-            if (*a++ != *b++)
-                return false;
-            continue;
-        }
-
-        int utf8SequenceLength = inlineUTF8SequenceLengthNonASCII(*b);
-
-        if (bEnd - b < utf8SequenceLength)
-            return false;
-
-        if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(b), utf8SequenceLength))
-            return 0;
-
-        UChar32 character = readUTF8Sequence(b, utf8SequenceLength);
-        ASSERT(!isASCII(character));
-
-        if (U_IS_BMP(character)) {
-            // UTF-16 surrogate values are illegal in UTF-32
-            if (U_IS_SURROGATE(character))
-                return false;
-            if (*a++ != character)
-                return false;
-        } else if (U_IS_SUPPLEMENTARY(character)) {
-            if (*a++ != U16_LEAD(character))
-                return false;
-            if (*a++ != U16_TRAIL(character))
-                return false;
-        } else {
-            return false;
-        }
-    }
-
-    return a == aEnd;
-}
-
-bool equalUTF16WithUTF8(const UChar* a, const UChar* aEnd, const char* b, const char* bEnd)
-{
-    return equalWithUTF8Internal(a, aEnd, b, bEnd);
-}
-
-bool equalLatin1WithUTF8(const LChar* a, const LChar* aEnd, const char* b, const char* bEnd)
-{
-    return equalWithUTF8Internal(a, aEnd, b, bEnd);
-}
-
-} // namespace Unicode
-} // namespace WTF
+      stringHasher.addCharacter(static_cast<UChar>(character));  // normal case
+      utf16Length++;
+    } else if (U_IS_SUPPLEMENTARY(character)) {
+      stringHasher.addCharacters(static_cast<UChar>(U16_LEAD(character)), static_cast<UChar>(U16_TRAIL(character)));
+      utf16Length += 2;
+    } else {
+      return 0;
+    }
+  }
+
+  return stringHasher.hashWithTop8BitsMasked();
+}
+
+template <typename CharType>
+ALWAYS_INLINE bool equalWithUTF8Internal(const CharType* a, const CharType* aEnd, const char* b, const char* bEnd) {
+  while (b < bEnd) {
+    if (isASCII(*b)) {
+      if (*a++ != *b++)
+        return false;
+      continue;
+    }
+
+    int utf8SequenceLength = inlineUTF8SequenceLengthNonASCII(*b);
+
+    if (bEnd - b < utf8SequenceLength)
+      return false;
+
+    if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(b), utf8SequenceLength))
+      return 0;
+
+    UChar32 character = readUTF8Sequence(b, utf8SequenceLength);
+    ASSERT(!isASCII(character));
+
+    if (U_IS_BMP(character)) {
+      // UTF-16 surrogate values are illegal in UTF-32
+      if (U_IS_SURROGATE(character))
+        return false;
+      if (*a++ != character)
+        return false;
+    } else if (U_IS_SUPPLEMENTARY(character)) {
+      if (*a++ != U16_LEAD(character))
+        return false;
+      if (*a++ != U16_TRAIL(character))
+        return false;
+    } else {
+      return false;
+    }
+  }
+
+  return a == aEnd;
+}
+
+bool equalUTF16WithUTF8(const UChar* a, const UChar* aEnd, const char* b, const char* bEnd) {
+  return equalWithUTF8Internal(a, aEnd, b, bEnd);
+}
+
+bool equalLatin1WithUTF8(const LChar* a, const LChar* aEnd, const char* b, const char* bEnd) {
+  return equalWithUTF8Internal(a, aEnd, b, bEnd);
+}
+
+}  // namespace Unicode
+}  // namespace WTF