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// UTFConvert.cpp
#include "StdAfx.h"
#include "UTFConvert.h"
#include "Types.h"
static Byte kUtf8Limits[5] = { 0xC0, 0xE0, 0xF0, 0xF8, 0xFC };
// These functions are for UTF8 <-> UTF16 conversion.
bool ConvertUTF8ToUnicode(const AString &src, UString &dest)
{
dest.Empty();
for(int i = 0; i < src.Length();)
{
Byte c = (Byte)src[i++];
if (c < 0x80)
{
dest += (wchar_t)c;
continue;
}
if(c < 0xC0)
return false;
int numAdds;
for (numAdds = 1; numAdds < 5; numAdds++)
if (c < kUtf8Limits[numAdds])
break;
UInt32 value = (c - kUtf8Limits[numAdds - 1]);
do
{
if (i >= src.Length())
return false;
Byte c2 = (Byte)src[i++];
if (c2 < 0x80 || c2 >= 0xC0)
return false;
value <<= 6;
value |= (c2 - 0x80);
numAdds--;
}
while(numAdds > 0);
if (value < 0x10000)
dest += (wchar_t)(value);
else
{
value -= 0x10000;
if (value >= 0x100000)
return false;
dest += (wchar_t)(0xD800 + (value >> 10));
dest += (wchar_t)(0xDC00 + (value & 0x3FF));
}
}
return true;
}
bool ConvertUnicodeToUTF8(const UString &src, AString &dest)
{
dest.Empty();
for(int i = 0; i < src.Length();)
{
UInt32 value = (UInt32)src[i++];
if (value < 0x80)
{
dest += (char)value;
continue;
}
if (value >= 0xD800 && value < 0xE000)
{
if (value >= 0xDC00)
return false;
if (i >= src.Length())
return false;
UInt32 c2 = (UInt32)src[i++];
if (c2 < 0xDC00 || c2 >= 0xE000)
return false;
value = ((value - 0xD800) << 10) | (c2 - 0xDC00);
}
int numAdds;
for (numAdds = 1; numAdds < 5; numAdds++)
if (value < (((UInt32)1) << (numAdds * 5 + 6)))
break;
dest += (char)(kUtf8Limits[numAdds - 1] + (value >> (6 * numAdds)));
do
{
numAdds--;
dest += (char)(0x80 + ((value >> (6 * numAdds)) & 0x3F));
}
while(numAdds > 0);
}
return true;
}
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