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/* CFStringEncodingConverterExt.h
Copyright (c) 1998-2019, Apple Inc. and the Swift project authors
Portions Copyright (c) 2014-2019, Apple Inc. and the Swift project authors
Licensed under Apache License v2.0 with Runtime Library Exception
See http://swift.org/LICENSE.txt for license information
See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
*/
#if !defined(__COREFOUNDATION_CFSTRINGENCODINGCONVERETEREXT__)
#define __COREFOUNDATION_CFSTRINGENCODINGCONVERETEREXT__ 1
#include "CFStringEncodingConverter.h"
CF_EXTERN_C_BEGIN
#define MAX_DECOMPOSED_LENGTH (10)
enum {
kCFStringEncodingConverterStandard = 0,
kCFStringEncodingConverterCheapEightBit = 1,
kCFStringEncodingConverterStandardEightBit = 2,
kCFStringEncodingConverterCheapMultiByte = 3,
kCFStringEncodingConverterPlatformSpecific = 4, // Other fields are ignored
kCFStringEncodingConverterICU = 5 // Other fields are ignored
};
/* kCFStringEncodingConverterStandard */
typedef CFIndex (*CFStringEncodingToBytesProc)(uint32_t flags, const UniChar *characters, CFIndex numChars, uint8_t *bytes, CFIndex maxByteLen, CFIndex *usedByteLen);
typedef CFIndex (*CFStringEncodingToUnicodeProc)(uint32_t flags, const uint8_t *bytes, CFIndex numBytes, UniChar *characters, CFIndex maxCharLen, CFIndex *usedCharLen);
/* kCFStringEncodingConverterCheapEightBit */
typedef bool (*CFStringEncodingCheapEightBitToBytesProc)(uint32_t flags, UniChar character, uint8_t *byte);
typedef bool (*CFStringEncodingCheapEightBitToUnicodeProc)(uint32_t flags, uint8_t byte, UniChar *character);
/* kCFStringEncodingConverterStandardEightBit */
typedef uint16_t (*CFStringEncodingStandardEightBitToBytesProc)(uint32_t flags, const UniChar *characters, CFIndex numChars, uint8_t *byte);
typedef uint16_t (*CFStringEncodingStandardEightBitToUnicodeProc)(uint32_t flags, uint8_t byte, UniChar *characters);
/* kCFStringEncodingConverterCheapMultiByte */
typedef uint16_t (*CFStringEncodingCheapMultiByteToBytesProc)(uint32_t flags, UniChar character, uint8_t *bytes);
typedef uint16_t (*CFStringEncodingCheapMultiByteToUnicodeProc)(uint32_t flags, const uint8_t *bytes, CFIndex numBytes, UniChar *character);
typedef CFIndex (*CFStringEncodingToBytesLenProc)(uint32_t flags, const UniChar *characters, CFIndex numChars);
typedef CFIndex (*CFStringEncodingToUnicodeLenProc)(uint32_t flags, const uint8_t *bytes, CFIndex numBytes);
typedef CFIndex (*CFStringEncodingToBytesPrecomposeProc)(uint32_t flags, const UniChar *character, CFIndex numChars, uint8_t *bytes, CFIndex maxByteLen, CFIndex *usedByteLen);
typedef bool (*CFStringEncodingIsValidCombiningCharacterProc)(UniChar character);
typedef struct {
// These conversion functions should be accessed and called as dictated by .encodingClass.
// An encoding class of kCFStringEncodingConverterStandard corresponds to .standard; kCFStringEncodingConverterCheapEightBit corresponds to .cheapEightBit; etc.
union {
CFStringEncodingToBytesProc standard;
CFStringEncodingCheapEightBitToBytesProc cheapEightBit;
CFStringEncodingStandardEightBitToBytesProc standardEightBit;
CFStringEncodingCheapMultiByteToBytesProc cheapMultibyte;
} toBytes;
union {
CFStringEncodingToUnicodeProc standard;
CFStringEncodingCheapEightBitToUnicodeProc cheapEightBit;
CFStringEncodingStandardEightBitToUnicodeProc standardEightBit;
CFStringEncodingCheapMultiByteToUnicodeProc cheapMultibyte;
} toUnicode;
uint16_t maxBytesPerChar;
uint16_t maxDecomposedCharLen;
uint8_t encodingClass;
uint32_t :24;
CFStringEncodingToBytesLenProc toBytesLen;
CFStringEncodingToUnicodeLenProc toUnicodeLen;
CFStringEncodingToBytesFallbackProc toBytesFallback;
CFStringEncodingToUnicodeFallbackProc toUnicodeFallback;
CFStringEncodingToBytesPrecomposeProc toBytesPrecompose;
CFStringEncodingIsValidCombiningCharacterProc isValidCombiningChar;
} CFStringEncodingConverter;
enum {
kCFStringEncodingGetConverterSelector = 0,
kCFStringEncodingIsDecomposableCharacterSelector = 1,
kCFStringEncodingDecomposeCharacterSelector = 2,
kCFStringEncodingIsValidLatin1CombiningCharacterSelector = 3,
kCFStringEncodingPrecomposeLatin1CharacterSelector = 4
};
#define BOOTSTRAPFUNC_NAME CFStringEncodingBootstrap
typedef const CFStringEncodingConverter* (*CFStringEncodingBootstrapProc)(uint32_t encoding, const void *getSelector);
/* Latin precomposition */
/* This function does not precompose recursively nor to U+01E0 and U+01E1.
*/
extern bool CFStringEncodingIsValidCombiningCharacterForLatin1(UniChar character);
extern UniChar CFStringEncodingPrecomposeLatinCharacter(const UniChar *character, CFIndex numChars, CFIndex *usedChars);
/* Convenience functions for converter development */
typedef struct _CFStringEncodingUnicodeTo8BitCharMap {
UniChar _u;
uint8_t _c;
uint8_t :8;
} CFStringEncodingUnicodeTo8BitCharMap;
/* Binary searches CFStringEncodingUnicodeTo8BitCharMap */
CF_INLINE bool CFStringEncodingUnicodeTo8BitEncoding(const CFStringEncodingUnicodeTo8BitCharMap *theTable, CFIndex numElem, UniChar character, uint8_t *ch) {
const CFStringEncodingUnicodeTo8BitCharMap *p, *q, *divider;
if ((character < theTable[0]._u) || (character > theTable[numElem-1]._u)) {
return 0;
}
p = theTable;
q = p + (numElem-1);
while (p <= q) {
divider = p + ((q - p) >> 1); /* divide by 2 */
if (character < divider->_u) { q = divider - 1; }
else if (character > divider->_u) { p = divider + 1; }
else { *ch = divider->_c; return 1; }
}
return 0;
}
CF_EXTERN_C_END
#endif /* ! __COREFOUNDATION_CFSTRINGENCODINGCONVERETEREXT__ */
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