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