Add unpacktool

PortabilityLayer/UTF16.cpp

@@ -0,0 +1,57 @@
+#include "UTF16.h"
+
+namespace PortabilityLayer
+{
+	bool UTF16Processor::DecodeCodePoint(const uint16_t *characters, size_t availableCharacters, size_t &outCharactersDigested, uint32_t &outCodePoint)
+	{
+		if (availableCharacters <= 0)
+			return false;
+
+		if ((characters[0] & 0xff80) == 0x00)
+		{
+			outCharactersDigested = 1;
+			outCodePoint = characters[0];
+			return true;
+		}
+
+		if (characters[0] <= 0xd7ff || characters[0] >= 0xe000)
+		{
+			outCharactersDigested = 1;
+			outCodePoint = characters[0];
+			return true;
+		}
+
+		// Surrogate pair
+		if (characters[0] >= 0xdc00 || availableCharacters < 2)
+			return false;
+
+		if (characters[1] < 0xdc00 || characters[1] >= 0xe000)
+			return false;
+
+		uint16_t highBits = (characters[0] & 0x3ff);
+		uint16_t lowBits = (characters[1] & 0x3ff);
+
+		outCharactersDigested = 2;
+		outCodePoint = (highBits << 10) + lowBits + 0x10000;
+
+		return true;
+	}
+
+	void UTF16Processor::EncodeCodePoint(uint16_t *characters, size_t &outCharactersEmitted, uint32_t codePoint)
+	{
+		if (codePoint <= 0xd7ff || codePoint >= 0xe000)
+		{
+			outCharactersEmitted = 1;
+			characters[0] = static_cast<uint16_t>(codePoint);
+			return;
+		}
+
+		uint32_t codePointBits = (codePoint - 0x10000) & 0xfffff;
+		uint16_t lowBits = (codePointBits & 0x3ff);
+		uint16_t highBits = ((codePointBits >> 10) & 0x3ff);
+
+		outCharactersEmitted = 2;
+		characters[0] = (0xd800 + highBits);
+		characters[1] = (0xdc00 + lowBits);
+	}
+}