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// UTFConvert.cpp
#include "StdAfx.h"
#include "MyTypes.h"
#include "UTFConvert.h"
#ifdef _WIN32
#define _WCHART_IS_16BIT 1
#endif
/*
_UTF8_START(n) - is a base value for start byte (head), if there are (n) additional bytes after start byte
n : _UTF8_START(n) : Bits of code point
0 : 0x80 : : unused
1 : 0xC0 : 11 :
2 : 0xE0 : 16 : Basic Multilingual Plane
3 : 0xF0 : 21 : Unicode space
3 : 0xF8 : 26 :
5 : 0xFC : 31 : UCS-4
6 : 0xFE : 36 : We can use it, if we want to encode any 32-bit value
7 : 0xFF :
*/
#define _UTF8_START(n) (0x100 - (1 << (7 - (n))))
#define _UTF8_HEAD_PARSE2(n) if (c < _UTF8_START((n) + 1)) { numBytes = (n); c -= _UTF8_START(n); }
#define _UTF8_HEAD_PARSE \
_UTF8_HEAD_PARSE2(1) \
else _UTF8_HEAD_PARSE2(2) \
else _UTF8_HEAD_PARSE2(3) \
else _UTF8_HEAD_PARSE2(4) \
else _UTF8_HEAD_PARSE2(5) \
// else _UTF8_HEAD_PARSE2(6)
bool CheckUTF8(const char *src, bool allowReduced) throw()
{
for (;;)
{
Byte c = *src++;
if (c == 0)
return true;
if (c < 0x80)
continue;
if (c < 0xC0) // (c < 0xC0 + 2) // if we support only optimal encoding chars
return false;
unsigned numBytes;
_UTF8_HEAD_PARSE
else
return false;
UInt32 val = c;
do
{
Byte c2 = *src++;
if (c2 < 0x80 || c2 >= 0xC0)
return allowReduced && c2 == 0;
val <<= 6;
val |= (c2 - 0x80);
}
while (--numBytes);
if (val >= 0x110000)
return false;
}
}
#define _ERROR_UTF8 \
{ if (dest) dest[destPos] = (wchar_t)0xFFFD; destPos++; ok = false; continue; }
static bool Utf8_To_Utf16(wchar_t *dest, size_t *destLen, const char *src, const char *srcLim) throw()
{
size_t destPos = 0;
bool ok = true;
for (;;)
{
Byte c;
if (src == srcLim)
{
*destLen = destPos;
return ok;
}
c = *src++;
if (c < 0x80)
{
if (dest)
dest[destPos] = (wchar_t)c;
destPos++;
continue;
}
if (c < 0xC0)
_ERROR_UTF8
unsigned numBytes;
_UTF8_HEAD_PARSE
else
_ERROR_UTF8
UInt32 val = c;
do
{
Byte c2;
if (src == srcLim)
break;
c2 = *src;
if (c2 < 0x80 || c2 >= 0xC0)
break;
src++;
val <<= 6;
val |= (c2 - 0x80);
}
while (--numBytes);
if (numBytes != 0)
_ERROR_UTF8
if (val < 0x10000)
{
if (dest)
dest[destPos] = (wchar_t)val;
destPos++;
}
else
{
val -= 0x10000;
if (val >= 0x100000)
_ERROR_UTF8
if (dest)
{
dest[destPos + 0] = (wchar_t)(0xD800 + (val >> 10));
dest[destPos + 1] = (wchar_t)(0xDC00 + (val & 0x3FF));
}
destPos += 2;
}
}
}
#define _UTF8_RANGE(n) (((UInt32)1) << ((n) * 5 + 6))
#define _UTF8_HEAD(n, val) ((char)(_UTF8_START(n) + (val >> (6 * (n)))))
#define _UTF8_CHAR(n, val) ((char)(0x80 + (((val) >> (6 * (n))) & 0x3F)))
static size_t Utf16_To_Utf8_Calc(const wchar_t *src, const wchar_t *srcLim)
{
size_t size = srcLim - src;
for (;;)
{
if (src == srcLim)
return size;
UInt32 val = *src++;
if (val < 0x80)
continue;
if (val < _UTF8_RANGE(1))
{
size++;
continue;
}
if (val >= 0xD800 && val < 0xDC00 && src != srcLim)
{
UInt32 c2 = *src;
if (c2 >= 0xDC00 && c2 < 0xE000)
{
src++;
size += 2;
continue;
}
}
#ifdef _WCHART_IS_16BIT
size += 2;
#else
if (val < _UTF8_RANGE(2)) size += 2;
else if (val < _UTF8_RANGE(3)) size += 3;
else if (val < _UTF8_RANGE(4)) size += 4;
else if (val < _UTF8_RANGE(5)) size += 5;
else size += 6;
#endif
}
}
static char *Utf16_To_Utf8(char *dest, const wchar_t *src, const wchar_t *srcLim)
{
for (;;)
{
if (src == srcLim)
return dest;
UInt32 val = *src++;
if (val < 0x80)
{
*dest++ = (char)val;
continue;
}
if (val < _UTF8_RANGE(1))
{
dest[0] = _UTF8_HEAD(1, val);
dest[1] = _UTF8_CHAR(0, val);
dest += 2;
continue;
}
if (val >= 0xD800 && val < 0xDC00 && src != srcLim)
{
UInt32 c2 = *src;
if (c2 >= 0xDC00 && c2 < 0xE000)
{
src++;
val = (((val - 0xD800) << 10) | (c2 - 0xDC00)) + 0x10000;
dest[0] = _UTF8_HEAD(3, val);
dest[1] = _UTF8_CHAR(2, val);
dest[2] = _UTF8_CHAR(1, val);
dest[3] = _UTF8_CHAR(0, val);
dest += 4;
continue;
}
}
#ifndef _WCHART_IS_16BIT
if (val < _UTF8_RANGE(2))
#endif
{
dest[0] = _UTF8_HEAD(2, val);
dest[1] = _UTF8_CHAR(1, val);
dest[2] = _UTF8_CHAR(0, val);
dest += 3;
continue;
}
#ifndef _WCHART_IS_16BIT
UInt32 b;
unsigned numBits;
if (val < _UTF8_RANGE(3)) { numBits = 6 * 3; b = _UTF8_HEAD(3, val); }
else if (val < _UTF8_RANGE(4)) { numBits = 6 * 4; b = _UTF8_HEAD(4, val); }
else if (val < _UTF8_RANGE(5)) { numBits = 6 * 5; b = _UTF8_HEAD(5, val); }
else { numBits = 6 * 6; b = _UTF8_START(6); }
*dest++ = (Byte)b;
do
{
numBits -= 6;
*dest++ = (char)(0x80 + ((val >> numBits) & 0x3F));
}
while (numBits != 0);
#endif
}
}
bool ConvertUTF8ToUnicode(const AString &src, UString &dest)
{
dest.Empty();
size_t destLen = 0;
Utf8_To_Utf16(NULL, &destLen, src, src.Ptr(src.Len()));
bool res = Utf8_To_Utf16(dest.GetBuf((unsigned)destLen), &destLen, src, src.Ptr(src.Len()));
dest.ReleaseBuf_SetEnd((unsigned)destLen);
return res;
}
void ConvertUnicodeToUTF8(const UString &src, AString &dest)
{
dest.Empty();
size_t destLen = Utf16_To_Utf8_Calc(src, src.Ptr(src.Len()));
Utf16_To_Utf8(dest.GetBuf((unsigned)destLen), src, src.Ptr(src.Len()));
dest.ReleaseBuf_SetEnd((unsigned)destLen);
}
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