#include "llvm/Support/ConvertUTF.h"
#ifdef CVTUTF_DEBUG
#include <stdio.h>
#endif
#include <assert.h>
static const int halfShift = 10;
static const UTF32 halfBase = 0x0010000UL;
static const UTF32 halfMask = 0x3FFUL;
#define UNI_SUR_HIGH_START (UTF32)0xD800
#define UNI_SUR_HIGH_END (UTF32)0xDBFF
#define UNI_SUR_LOW_START (UTF32)0xDC00
#define UNI_SUR_LOW_END (UTF32)0xDFFF
#define false 0
#define true 1
static const char trailingBytesForUTF8[256] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
};
static const UTF32 offsetsFromUTF8[6] = { 0x00000000UL, 0x00003080UL, 0x000E2080UL,
0x03C82080UL, 0xFA082080UL, 0x82082080UL };
static const UTF8 firstByteMark[7] = { 0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
ConversionResult ConvertUTF32toUTF16 (
const UTF32** sourceStart, const UTF32* sourceEnd,
UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {
ConversionResult result = conversionOK;
const UTF32* source = *sourceStart;
UTF16* target = *targetStart;
while (source < sourceEnd) {
UTF32 ch;
if (target >= targetEnd) {
result = targetExhausted; break;
}
ch = *source++;
if (ch <= UNI_MAX_BMP) {
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
if (flags == strictConversion) {
--source;
result = sourceIllegal;
break;
} else {
*target++ = UNI_REPLACEMENT_CHAR;
}
} else {
*target++ = (UTF16)ch;
}
} else if (ch > UNI_MAX_LEGAL_UTF32) {
if (flags == strictConversion) {
result = sourceIllegal;
} else {
*target++ = UNI_REPLACEMENT_CHAR;
}
} else {
if (target + 1 >= targetEnd) {
--source;
result = targetExhausted; break;
}
ch -= halfBase;
*target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
*target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
}
}
*sourceStart = source;
*targetStart = target;
return result;
}
ConversionResult ConvertUTF16toUTF32 (
const UTF16** sourceStart, const UTF16* sourceEnd,
UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags) {
ConversionResult result = conversionOK;
const UTF16* source = *sourceStart;
UTF32* target = *targetStart;
UTF32 ch, ch2;
while (source < sourceEnd) {
const UTF16* oldSource = source;
ch = *source++;
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
if (source < sourceEnd) {
ch2 = *source;
if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
+ (ch2 - UNI_SUR_LOW_START) + halfBase;
++source;
} else if (flags == strictConversion) {
--source;
result = sourceIllegal;
break;
}
} else {
--source;
result = sourceExhausted;
break;
}
} else if (flags == strictConversion) {
if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
--source;
result = sourceIllegal;
break;
}
}
if (target >= targetEnd) {
source = oldSource;
result = targetExhausted; break;
}
*target++ = ch;
}
*sourceStart = source;
*targetStart = target;
#ifdef CVTUTF_DEBUG
if (result == sourceIllegal) {
fprintf(stderr, "ConvertUTF16toUTF32 illegal seq 0x%04x,%04x\n", ch, ch2);
fflush(stderr);
}
#endif
return result;
}
ConversionResult ConvertUTF16toUTF8 (
const UTF16** sourceStart, const UTF16* sourceEnd,
UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
ConversionResult result = conversionOK;
const UTF16* source = *sourceStart;
UTF8* target = *targetStart;
while (source < sourceEnd) {
UTF32 ch;
unsigned short bytesToWrite = 0;
const UTF32 byteMask = 0xBF;
const UTF32 byteMark = 0x80;
const UTF16* oldSource = source;
ch = *source++;
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
if (source < sourceEnd) {
UTF32 ch2 = *source;
if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
ch = ((ch - UNI_SUR_HIGH_START) << halfShift)
+ (ch2 - UNI_SUR_LOW_START) + halfBase;
++source;
} else if (flags == strictConversion) {
--source;
result = sourceIllegal;
break;
}
} else {
--source;
result = sourceExhausted;
break;
}
} else if (flags == strictConversion) {
if (ch >= UNI_SUR_LOW_START && ch <= UNI_SUR_LOW_END) {
--source;
result = sourceIllegal;
break;
}
}
if (ch < (UTF32)0x80) { bytesToWrite = 1;
} else if (ch < (UTF32)0x800) { bytesToWrite = 2;
} else if (ch < (UTF32)0x10000) { bytesToWrite = 3;
} else if (ch < (UTF32)0x110000) { bytesToWrite = 4;
} else { bytesToWrite = 3;
ch = UNI_REPLACEMENT_CHAR;
}
target += bytesToWrite;
if (target > targetEnd) {
source = oldSource;
target -= bytesToWrite; result = targetExhausted; break;
}
switch (bytesToWrite) {
case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
case 1: *--target = (UTF8)(ch | firstByteMark[bytesToWrite]);
}
target += bytesToWrite;
}
*sourceStart = source;
*targetStart = target;
return result;
}
ConversionResult ConvertUTF32toUTF8 (
const UTF32** sourceStart, const UTF32* sourceEnd,
UTF8** targetStart, UTF8* targetEnd, ConversionFlags flags) {
ConversionResult result = conversionOK;
const UTF32* source = *sourceStart;
UTF8* target = *targetStart;
while (source < sourceEnd) {
UTF32 ch;
unsigned short bytesToWrite = 0;
const UTF32 byteMask = 0xBF;
const UTF32 byteMark = 0x80;
ch = *source++;
if (flags == strictConversion ) {
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
--source;
result = sourceIllegal;
break;
}
}
if (ch < (UTF32)0x80) { bytesToWrite = 1;
} else if (ch < (UTF32)0x800) { bytesToWrite = 2;
} else if (ch < (UTF32)0x10000) { bytesToWrite = 3;
} else if (ch <= UNI_MAX_LEGAL_UTF32) { bytesToWrite = 4;
} else { bytesToWrite = 3;
ch = UNI_REPLACEMENT_CHAR;
result = sourceIllegal;
}
target += bytesToWrite;
if (target > targetEnd) {
--source;
target -= bytesToWrite; result = targetExhausted; break;
}
switch (bytesToWrite) {
case 4: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
case 3: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
case 2: *--target = (UTF8)((ch | byteMark) & byteMask); ch >>= 6;
case 1: *--target = (UTF8) (ch | firstByteMark[bytesToWrite]);
}
target += bytesToWrite;
}
*sourceStart = source;
*targetStart = target;
return result;
}
static Boolean isLegalUTF8(const UTF8 *source, int length) {
UTF8 a;
const UTF8 *srcptr = source+length;
switch (length) {
default: return false;
case 4: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
case 3: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
case 2: if ((a = (*--srcptr)) < 0x80 || a > 0xBF) return false;
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;
}
case 1: if (*source >= 0x80 && *source < 0xC2) return false;
}
if (*source > 0xF4) return false;
return true;
}
Boolean isLegalUTF8Sequence(const UTF8 *source, const UTF8 *sourceEnd) {
int length = trailingBytesForUTF8[*source]+1;
if (length > sourceEnd - source) {
return false;
}
return isLegalUTF8(source, length);
}
static unsigned
findMaximalSubpartOfIllFormedUTF8Sequence(const UTF8 *source,
const UTF8 *sourceEnd) {
assert(!isLegalUTF8Sequence(source, sourceEnd));
if (source == sourceEnd)
return 0;
UTF8 b1 = *source;
++source;
if (b1 >= 0xC2 && b1 <= 0xDF) {
return 1;
}
if (source == sourceEnd)
return 1;
UTF8 b2 = *source;
++source;
if (b1 == 0xE0) {
return (b2 >= 0xA0 && b2 <= 0xBF) ? 2 : 1;
}
if (b1 >= 0xE1 && b1 <= 0xEC) {
return (b2 >= 0x80 && b2 <= 0xBF) ? 2 : 1;
}
if (b1 == 0xED) {
return (b2 >= 0x80 && b2 <= 0x9F) ? 2 : 1;
}
if (b1 >= 0xEE && b1 <= 0xEF) {
return (b2 >= 0x80 && b2 <= 0xBF) ? 2 : 1;
}
if (b1 == 0xF0) {
if (b2 >= 0x90 && b2 <= 0xBF) {
if (source == sourceEnd)
return 2;
UTF8 b3 = *source;
return (b3 >= 0x80 && b3 <= 0xBF) ? 3 : 2;
}
return 1;
}
if (b1 >= 0xF1 && b1 <= 0xF3) {
if (b2 >= 0x80 && b2 <= 0xBF) {
if (source == sourceEnd)
return 2;
UTF8 b3 = *source;
return (b3 >= 0x80 && b3 <= 0xBF) ? 3 : 2;
}
return 1;
}
if (b1 == 0xF4) {
if (b2 >= 0x80 && b2 <= 0x8F) {
if (source == sourceEnd)
return 2;
UTF8 b3 = *source;
return (b3 >= 0x80 && b3 <= 0xBF) ? 3 : 2;
}
return 1;
}
assert((b1 >= 0x80 && b1 <= 0xC1) || b1 >= 0xF5);
return 1;
}
unsigned getNumBytesForUTF8(UTF8 first) {
return trailingBytesForUTF8[first] + 1;
}
Boolean isLegalUTF8String(const UTF8 **source, const UTF8 *sourceEnd) {
while (*source != sourceEnd) {
int length = trailingBytesForUTF8[**source] + 1;
if (length > sourceEnd - *source || !isLegalUTF8(*source, length))
return false;
*source += length;
}
return true;
}
ConversionResult ConvertUTF8toUTF16 (
const UTF8** sourceStart, const UTF8* sourceEnd,
UTF16** targetStart, UTF16* targetEnd, ConversionFlags flags) {
ConversionResult result = conversionOK;
const UTF8* source = *sourceStart;
UTF16* target = *targetStart;
while (source < sourceEnd) {
UTF32 ch = 0;
unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
if (extraBytesToRead >= sourceEnd - source) {
result = sourceExhausted; break;
}
if (!isLegalUTF8(source, extraBytesToRead+1)) {
result = sourceIllegal;
break;
}
switch (extraBytesToRead) {
case 5: ch += *source++; ch <<= 6;
case 4: ch += *source++; ch <<= 6;
case 3: ch += *source++; ch <<= 6;
case 2: ch += *source++; ch <<= 6;
case 1: ch += *source++; ch <<= 6;
case 0: ch += *source++;
}
ch -= offsetsFromUTF8[extraBytesToRead];
if (target >= targetEnd) {
source -= (extraBytesToRead+1);
result = targetExhausted; break;
}
if (ch <= UNI_MAX_BMP) {
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
if (flags == strictConversion) {
source -= (extraBytesToRead+1);
result = sourceIllegal;
break;
} else {
*target++ = UNI_REPLACEMENT_CHAR;
}
} else {
*target++ = (UTF16)ch;
}
} else if (ch > UNI_MAX_UTF16) {
if (flags == strictConversion) {
result = sourceIllegal;
source -= (extraBytesToRead+1);
break;
} else {
*target++ = UNI_REPLACEMENT_CHAR;
}
} else {
if (target + 1 >= targetEnd) {
source -= (extraBytesToRead+1);
result = targetExhausted; break;
}
ch -= halfBase;
*target++ = (UTF16)((ch >> halfShift) + UNI_SUR_HIGH_START);
*target++ = (UTF16)((ch & halfMask) + UNI_SUR_LOW_START);
}
}
*sourceStart = source;
*targetStart = target;
return result;
}
static ConversionResult ConvertUTF8toUTF32Impl(
const UTF8** sourceStart, const UTF8* sourceEnd,
UTF32** targetStart, UTF32* targetEnd, ConversionFlags flags,
Boolean InputIsPartial) {
ConversionResult result = conversionOK;
const UTF8* source = *sourceStart;
UTF32* target = *targetStart;
while (source < sourceEnd) {
UTF32 ch = 0;
unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
if (extraBytesToRead >= sourceEnd - source) {
if (flags == strictConversion || InputIsPartial) {
result = sourceExhausted;
break;
} else {
result = sourceIllegal;
source += findMaximalSubpartOfIllFormedUTF8Sequence(source,
sourceEnd);
*target++ = UNI_REPLACEMENT_CHAR;
continue;
}
}
if (target >= targetEnd) {
result = targetExhausted; break;
}
if (!isLegalUTF8(source, extraBytesToRead+1)) {
result = sourceIllegal;
if (flags == strictConversion) {
break;
} else {
source += findMaximalSubpartOfIllFormedUTF8Sequence(source,
sourceEnd);
*target++ = UNI_REPLACEMENT_CHAR;
continue;
}
}
switch (extraBytesToRead) {
case 5: ch += *source++; ch <<= 6;
case 4: ch += *source++; ch <<= 6;
case 3: ch += *source++; ch <<= 6;
case 2: ch += *source++; ch <<= 6;
case 1: ch += *source++; ch <<= 6;
case 0: ch += *source++;
}
ch -= offsetsFromUTF8[extraBytesToRead];
if (ch <= UNI_MAX_LEGAL_UTF32) {
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_LOW_END) {
if (flags == strictConversion) {
source -= (extraBytesToRead+1);
result = sourceIllegal;
break;
} else {
*target++ = UNI_REPLACEMENT_CHAR;
}
} else {
*target++ = ch;
}
} else {
result = sourceIllegal;
*target++ = UNI_REPLACEMENT_CHAR;
}
}
*sourceStart = source;
*targetStart = target;
return result;
}
ConversionResult ConvertUTF8toUTF32Partial(const UTF8 **sourceStart,
const UTF8 *sourceEnd,
UTF32 **targetStart,
UTF32 *targetEnd,
ConversionFlags flags) {
return ConvertUTF8toUTF32Impl(sourceStart, sourceEnd, targetStart, targetEnd,
flags, true);
}
ConversionResult ConvertUTF8toUTF32(const UTF8 **sourceStart,
const UTF8 *sourceEnd, UTF32 **targetStart,
UTF32 *targetEnd, ConversionFlags flags) {
return ConvertUTF8toUTF32Impl(sourceStart, sourceEnd, targetStart, targetEnd,
flags, false);
}