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/* CFPlatformConverters.c
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
Responsibility: Foundation Team
*/
#include "CFInternal.h"
#include "CFString.h"
#include "CFStringEncodingConverterExt.h"
#include "CFStringEncodingExt.h"
#include "CFUniChar.h"
#include "CFUnicodeDecomposition.h"
#include "CFStringEncodingConverterPriv.h"
#include "CFICUConverters.h"
CF_INLINE bool __CFIsPlatformConverterAvailable(int encoding) {
#if TARGET_OS_WIN32
return (IsValidCodePage(CFStringConvertEncodingToWindowsCodepage(encoding)) ? true : false);
#else
return false;
#endif
}
#if TARGET_OS_MAC || TARGET_OS_WIN32 || TARGET_OS_LINUX || TARGET_OS_WASI
static const CFStringEncodingConverter __CFICUBootstrap = {
.toBytes.standard = NULL,
.toUnicode.standard = NULL,
.maxBytesPerChar = 6,
.maxDecomposedCharLen = 4,
.encodingClass = kCFStringEncodingConverterICU,
.toBytesLen = NULL,
.toUnicodeLen = NULL,
.toBytesFallback = NULL,
.toUnicodeFallback = NULL,
.toBytesPrecompose = NULL,
.isValidCombiningChar = NULL,
};
#endif
static const CFStringEncodingConverter __CFPlatformBootstrap = {
.toBytes.standard = NULL,
.toUnicode.standard = NULL,
.maxBytesPerChar = 6,
.maxDecomposedCharLen = 4,
.encodingClass = kCFStringEncodingConverterPlatformSpecific,
.toBytesLen = NULL,
.toUnicodeLen = NULL,
.toBytesFallback = NULL,
.toUnicodeFallback = NULL,
.toBytesPrecompose = NULL,
.isValidCombiningChar = NULL,
};
CF_PRIVATE const CFStringEncodingConverter *__CFStringEncodingGetExternalConverter(uint32_t encoding) {
// we prefer Text Encoding Converter ICU since it's more reliable
if (__CFIsPlatformConverterAvailable(encoding)) {
return &__CFPlatformBootstrap;
} else {
#if TARGET_OS_MAC || TARGET_OS_WIN32 || TARGET_OS_LINUX || TARGET_OS_WASI
if (__CFStringEncodingGetICUName(encoding)) {
return &__CFICUBootstrap;
}
#endif
return NULL;
}
}
#if TARGET_OS_MAC
CF_PRIVATE CFStringEncoding *__CFStringEncodingCreateListOfAvailablePlatformConverters(CFAllocatorRef allocator, CFIndex *numberOfConverters) {
return NULL;
}
#elif TARGET_OS_WIN32
#include <tchar.h>
static uint32_t __CFWin32EncodingIndex = 0;
static CFStringEncoding *__CFWin32EncodingList = NULL;
static char CALLBACK __CFWin32EnumCodePageProc(LPTSTR string) {
uint32_t encoding = CFStringConvertWindowsCodepageToEncoding(_tcstoul(string, NULL, 10));
CFIndex idx;
if (encoding != kCFStringEncodingInvalidId) { // We list only encodings we know
if (__CFWin32EncodingList) {
for (idx = 0;idx < (CFIndex)__CFWin32EncodingIndex;idx++) if (__CFWin32EncodingList[idx] == encoding) break;
if (idx != __CFWin32EncodingIndex) return true;
__CFWin32EncodingList[__CFWin32EncodingIndex] = encoding;
}
++__CFWin32EncodingIndex;
}
return true;
}
CF_PRIVATE CFStringEncoding *__CFStringEncodingCreateListOfAvailablePlatformConverters(CFAllocatorRef allocator, CFIndex *numberOfConverters) {
CFStringEncoding *encodings;
EnumSystemCodePages((CODEPAGE_ENUMPROC)&__CFWin32EnumCodePageProc, CP_INSTALLED);
__CFWin32EncodingList = (uint32_t *)CFAllocatorAllocate(allocator, sizeof(uint32_t) * __CFWin32EncodingIndex, 0);
EnumSystemCodePages((CODEPAGE_ENUMPROC)&__CFWin32EnumCodePageProc, CP_INSTALLED);
*numberOfConverters = __CFWin32EncodingIndex;
encodings = __CFWin32EncodingList;
__CFWin32EncodingIndex = 0;
__CFWin32EncodingList = NULL;
return encodings;
}
#else
CF_PRIVATE CFStringEncoding *__CFStringEncodingCreateListOfAvailablePlatformConverters(CFAllocatorRef allocator, CFIndex *numberOfConverters) { return NULL; }
#endif
CF_PRIVATE CFIndex __CFStringEncodingPlatformUnicodeToBytes(uint32_t encoding, uint32_t flags, const UniChar *characters, CFIndex numChars, CFIndex *usedCharLen, uint8_t *bytes, CFIndex maxByteLen, CFIndex *usedByteLen) {
#if TARGET_OS_WIN32
WORD dwFlags = 0;
CFIndex usedLen;
if ((kCFStringEncodingUTF7 != encoding) && (kCFStringEncodingGB_18030_2000 != encoding) && (0x0800 != (encoding & 0x0F00))) { // not UTF-7/GB18030/ISO-2022-*
dwFlags |= (flags & (kCFStringEncodingAllowLossyConversion|kCFStringEncodingSubstituteCombinings) ? WC_DEFAULTCHAR : 0);
dwFlags |= (flags & kCFStringEncodingComposeCombinings ? WC_COMPOSITECHECK : 0);
dwFlags |= (flags & kCFStringEncodingIgnoreCombinings ? WC_DISCARDNS : 0);
}
if ((usedLen = WideCharToMultiByte(CFStringConvertEncodingToWindowsCodepage(encoding), dwFlags, (LPCWSTR)characters, numChars, (LPSTR)bytes, maxByteLen, NULL, NULL)) == 0) {
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
CPINFO cpInfo;
if (!GetCPInfo(CFStringConvertEncodingToWindowsCodepage(encoding), &cpInfo)) {
cpInfo.MaxCharSize = 1; // Is this right ???
}
if (cpInfo.MaxCharSize == 1) {
numChars = maxByteLen;
} else {
usedLen = WideCharToMultiByte(CFStringConvertEncodingToWindowsCodepage(encoding), dwFlags, (LPCWSTR)characters, numChars, NULL, 0, NULL, NULL);
usedLen -= maxByteLen;
numChars = (numChars > usedLen ? numChars - usedLen : 1);
}
if (WideCharToMultiByte(CFStringConvertEncodingToWindowsCodepage(encoding), dwFlags, (LPCWSTR)characters, numChars, (LPSTR)bytes, maxByteLen, NULL, NULL) == 0) {
if (usedCharLen) *usedCharLen = 0;
if (usedByteLen) *usedByteLen = 0;
} else {
CFIndex lastUsedLen = 0;
while ((usedLen = WideCharToMultiByte(CFStringConvertEncodingToWindowsCodepage(encoding), dwFlags, (LPCWSTR)characters, ++numChars, (LPSTR)bytes, maxByteLen, NULL, NULL))) lastUsedLen = usedLen;
if (usedCharLen) *usedCharLen = (numChars - 1);
if (usedByteLen) *usedByteLen = lastUsedLen;
}
return kCFStringEncodingInsufficientOutputBufferLength;
} else {
return kCFStringEncodingInvalidInputStream;
}
} else {
if (usedCharLen) *usedCharLen = numChars;
if (usedByteLen) *usedByteLen = usedLen;
return kCFStringEncodingConversionSuccess;
}
#endif /* TARGET_OS_WIN32 */
return kCFStringEncodingConverterUnavailable;
}
CF_PRIVATE CFIndex __CFStringEncodingPlatformBytesToUnicode(uint32_t encoding, uint32_t flags, const uint8_t *bytes, CFIndex numBytes, CFIndex *usedByteLen, UniChar *characters, CFIndex maxCharLen, CFIndex *usedCharLen) {
#if TARGET_OS_WIN32
WORD dwFlags = 0;
CFIndex usedLen;
if ((kCFStringEncodingUTF7 != encoding) && (kCFStringEncodingGB_18030_2000 != encoding) && (0x0800 != (encoding & 0x0F00))) { // not UTF-7/GB18030/ISO-2022-*
dwFlags |= (flags & (kCFStringEncodingAllowLossyConversion|kCFStringEncodingSubstituteCombinings) ? 0 : MB_ERR_INVALID_CHARS);
dwFlags |= (flags & (kCFStringEncodingUseCanonical|kCFStringEncodingUseHFSPlusCanonical) ? MB_COMPOSITE : MB_PRECOMPOSED);
}
if ((usedLen = MultiByteToWideChar(CFStringConvertEncodingToWindowsCodepage(encoding), dwFlags, (LPCSTR)bytes, numBytes, (LPWSTR)characters, maxCharLen)) == 0) {
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
CPINFO cpInfo;
if (!GetCPInfo(CFStringConvertEncodingToWindowsCodepage(encoding), &cpInfo)) {
cpInfo.MaxCharSize = 1; // Is this right ???
}
if (cpInfo.MaxCharSize == 1) {
numBytes = maxCharLen;
} else {
usedLen = MultiByteToWideChar(CFStringConvertEncodingToWindowsCodepage(encoding), dwFlags, (LPCSTR)bytes, numBytes, (LPWSTR)characters, maxCharLen);
usedLen -= maxCharLen;
numBytes = (numBytes > usedLen ? numBytes - usedLen : 1);
}
while ((usedLen = MultiByteToWideChar(CFStringConvertEncodingToWindowsCodepage(encoding), dwFlags, (LPCSTR)bytes, numBytes, (LPWSTR)characters, maxCharLen)) == 0) {
if ((--numBytes) == 0) break;
}
if (usedCharLen) *usedCharLen = usedLen;
if (usedByteLen) *usedByteLen = numBytes;
return kCFStringEncodingInsufficientOutputBufferLength;
} else {
return kCFStringEncodingInvalidInputStream;
}
} else {
if (usedCharLen) *usedCharLen = usedLen;
if (usedByteLen) *usedByteLen = numBytes;
return kCFStringEncodingConversionSuccess;
}
#endif /* TARGET_OS_WIN32 */
return kCFStringEncodingConverterUnavailable;
}
CF_PRIVATE CFIndex __CFStringEncodingPlatformCharLengthForBytes(uint32_t encoding, uint32_t flags, const uint8_t *bytes, CFIndex numBytes) {
CFIndex usedCharLen;
return (__CFStringEncodingPlatformBytesToUnicode(encoding, flags, bytes, numBytes, NULL, NULL, 0, &usedCharLen) == kCFStringEncodingConversionSuccess ? usedCharLen : 0);
}
CF_PRIVATE CFIndex __CFStringEncodingPlatformByteLengthForCharacters(uint32_t encoding, uint32_t flags, const UniChar *characters, CFIndex numChars) {
CFIndex usedByteLen;
return (__CFStringEncodingPlatformUnicodeToBytes(encoding, flags, characters, numChars, NULL, NULL, 0, &usedByteLen) == kCFStringEncodingConversionSuccess ? usedByteLen : 0);
}
#undef __CFCarbonCore_GetTextEncodingBase0
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