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-rw-r--r--deps/v8/src/inspector/string-16.cc390
1 files changed, 7 insertions, 383 deletions
diff --git a/deps/v8/src/inspector/string-16.cc b/deps/v8/src/inspector/string-16.cc
index 303987dede..acf0159f27 100644
--- a/deps/v8/src/inspector/string-16.cc
+++ b/deps/v8/src/inspector/string-16.cc
@@ -6,14 +6,15 @@
#include <algorithm>
#include <cctype>
+#include <cinttypes>
#include <cstdlib>
#include <cstring>
#include <limits>
#include <string>
#include "src/base/platform/platform.h"
-#include "src/base/v8-fallthrough.h"
-#include "src/conversions.h"
+#include "src/inspector/v8-string-conversions.h"
+#include "src/numbers/conversions.h"
namespace v8_inspector {
@@ -44,331 +45,6 @@ int64_t charactersToInteger(const UChar* characters, size_t length,
if (ok) *ok = !(*endptr);
return result;
}
-
-const UChar replacementCharacter = 0xFFFD;
-using UChar32 = uint32_t;
-
-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);
-}
-
-// 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};
-
-typedef enum {
- conversionOK, // conversion successful
- sourceExhausted, // partial character in source, but hit end
- targetExhausted, // insuff. room in target for conversion
- sourceIllegal // source sequence is illegal/malformed
-} ConversionResult;
-
-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;
- uint32_t 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<uint16_t>(*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<uint16_t>(*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 < static_cast<UChar32>(0x80)) {
- bytesToWrite = 1;
- } else if (ch < static_cast<UChar32>(0x800)) {
- bytesToWrite = 2;
- } else if (ch < static_cast<UChar32>(0x10000)) {
- bytesToWrite = 3;
- } else if (ch < static_cast<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) {
- case 4:
- *--target = static_cast<char>((ch | byteMark) & byteMask);
- ch >>= 6;
- V8_FALLTHROUGH;
- case 3:
- *--target = static_cast<char>((ch | byteMark) & byteMask);
- ch >>= 6;
- V8_FALLTHROUGH;
- case 2:
- *--target = static_cast<char>((ch | byteMark) & byteMask);
- ch >>= 6;
- V8_FALLTHROUGH;
- case 1:
- *--target = static_cast<char>(ch | firstByteMark[bytesToWrite]);
- }
- target += bytesToWrite;
- }
- *sourceStart = source;
- *targetStart = target;
- return result;
-}
-
-/**
- * Is this code point a BMP code point (U+0000..U+ffff)?
- * @param c 32-bit code point
- * @return TRUE or FALSE
- * @stable ICU 2.8
- */
-#define U_IS_BMP(c) ((uint32_t)(c) <= 0xFFFF)
-
-/**
- * Is this code point a supplementary code point (U+010000..U+10FFFF)?
- * @param c 32-bit code point
- * @return TRUE or FALSE
- * @stable ICU 2.8
- */
-#define U_IS_SUPPLEMENTARY(c) ((uint32_t)((c)-0x010000) <= 0xFFFFF)
-
-/**
- * Is this code point a surrogate (U+d800..U+dfff)?
- * @param c 32-bit code point
- * @return TRUE or FALSE
- * @stable ICU 2.4
- */
-#define U_IS_SURROGATE(c) (((c)&0xFFFFF800) == 0xD800)
-
-/**
- * Get the lead surrogate (0xD800..0xDBFF) for a
- * supplementary code point (0x010000..0x10FFFF).
- * @param supplementary 32-bit code point (U+010000..U+10FFFF)
- * @return lead surrogate (U+D800..U+DBFF) for supplementary
- * @stable ICU 2.4
- */
-#define U16_LEAD(supplementary) (UChar)(((supplementary) >> 10) + 0xD7C0)
-
-/**
- * Get the trail surrogate (0xDC00..0xDFFF) for a
- * supplementary code point (0x010000..0x10FFFF).
- * @param supplementary 32-bit code point (U+010000..U+10FFFF)
- * @return trail surrogate (U+DC00..U+DFFF) for supplementary
- * @stable ICU 2.4
- */
-#define U16_TRAIL(supplementary) (UChar)(((supplementary)&0x3FF) | 0xDC00)
-
-// 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) {
- default:
- return false;
- // Everything else falls through when "true"...
- case 4:
- if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
- V8_FALLTHROUGH;
- case 3:
- if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
- V8_FALLTHROUGH;
- case 2:
- if ((a = (*--srcptr)) > 0xBF) return false;
-
- // no fall-through in this inner switch
- switch (*source) {
- case 0xE0:
- if (a < 0xA0) return false;
- break;
- case 0xED:
- if (a > 0x9F) return false;
- break;
- case 0xF0:
- if (a < 0x90) return false;
- break;
- case 0xF4:
- if (a > 0x8F) return false;
- break;
- default:
- if (a < 0x80) return false;
- }
- V8_FALLTHROUGH;
-
- case 1:
- 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, size_t length) {
- UChar32 character = 0;
-
- // The cases all fall through.
- switch (length) {
- case 6:
- character += static_cast<unsigned char>(*sequence++);
- character <<= 6;
- V8_FALLTHROUGH;
- case 5:
- character += static_cast<unsigned char>(*sequence++);
- character <<= 6;
- V8_FALLTHROUGH;
- case 4:
- character += static_cast<unsigned char>(*sequence++);
- character <<= 6;
- V8_FALLTHROUGH;
- case 3:
- character += static_cast<unsigned char>(*sequence++);
- character <<= 6;
- V8_FALLTHROUGH;
- case 2:
- character += static_cast<unsigned char>(*sequence++);
- character <<= 6;
- V8_FALLTHROUGH;
- case 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;
- }
- // 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;
-}
-
-// Helper to write a three-byte UTF-8 code point to the buffer, caller must
-// check room is available.
-static inline void putUTF8Triple(char*& buffer, UChar ch) {
- *buffer++ = static_cast<char>(((ch >> 12) & 0x0F) | 0xE0);
- *buffer++ = static_cast<char>(((ch >> 6) & 0x3F) | 0x80);
- *buffer++ = static_cast<char>((ch & 0x3F) | 0x80);
-}
-
} // namespace
String16::String16(const UChar* characters, size_t size)
@@ -386,6 +62,8 @@ String16::String16(const char* characters, size_t size) {
String16::String16(const std::basic_string<UChar>& impl) : m_impl(impl) {}
+String16::String16(std::basic_string<UChar>&& impl) : m_impl(impl) {}
+
// static
String16 String16::fromInteger(int number) {
char arr[50];
@@ -519,65 +197,11 @@ void String16Builder::reserveCapacity(size_t capacity) {
}
String16 String16::fromUTF8(const char* stringStart, size_t length) {
- if (!stringStart || !length) return String16();
-
- std::vector<UChar> buffer(length);
- UChar* bufferStart = buffer.data();
-
- UChar* bufferCurrent = bufferStart;
- const char* stringCurrent = stringStart;
- if (convertUTF8ToUTF16(&stringCurrent, stringStart + length, &bufferCurrent,
- bufferCurrent + buffer.size(), nullptr,
- true) != conversionOK)
- return String16();
-
- size_t utf16Length = bufferCurrent - bufferStart;
- return String16(bufferStart, utf16Length);
+ return String16(UTF8ToUTF16(stringStart, length));
}
std::string String16::utf8() const {
- size_t length = this->length();
-
- if (!length) return std::string("");
-
- // Allocate a buffer big enough to hold all the characters
- // (an individual UTF-16 UChar can only expand to 3 UTF-8 bytes).
- // Optimization ideas, if we find this function is hot:
- // * We could speculatively create a CStringBuffer to contain 'length'
- // characters, and resize if necessary (i.e. if the buffer contains
- // non-ascii characters). (Alternatively, scan the buffer first for
- // ascii characters, so we know this will be sufficient).
- // * We could allocate a CStringBuffer with an appropriate size to
- // have a good chance of being able to write the string into the
- // buffer without reallocing (say, 1.5 x length).
- if (length > std::numeric_limits<unsigned>::max() / 3) return std::string();
-
- std::string output(length * 3, '\0');
- const UChar* characters = m_impl.data();
- const UChar* characters_end = characters + length;
- char* buffer = &*output.begin();
- char* buffer_end = &*output.end();
- while (characters < characters_end) {
- // Use strict conversion to detect unpaired surrogates.
- ConversionResult result = convertUTF16ToUTF8(
- &characters, characters_end, &buffer, buffer_end, /* strict= */ true);
- DCHECK_NE(result, targetExhausted);
- // Conversion fails when there is an unpaired surrogate. Put
- // replacement character (U+FFFD) instead of the unpaired
- // surrogate.
- if (result != conversionOK) {
- DCHECK_LE(0xD800, *characters);
- DCHECK_LE(*characters, 0xDFFF);
- // There should be room left, since one UChar hasn't been
- // converted.
- DCHECK_LE(buffer + 3, buffer_end);
- putUTF8Triple(buffer, replacementCharacter);
- ++characters;
- }
- }
-
- output.resize(buffer - output.data());
- return output;
+ return UTF16ToUTF8(m_impl.data(), m_impl.size());
}
} // namespace v8_inspector
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-15 11:33:27 +0000