Add unpacktool

unpacktool/CompactProRLEDecompressor.cpp

@@ -0,0 +1,112 @@
+#include "CompactProRLEDecompressor.h"
+
+#include "CSInputBuffer.h"
+
+CompactProRLEDecompressor::CompactProRLEDecompressor()
+	: input(nullptr)
+	, saved(0)
+	, repeat(0)
+	, halfescaped(false)
+{
+}
+
+CompactProRLEDecompressor::~CompactProRLEDecompressor()
+{
+}
+
+bool CompactProRLEDecompressor::Reset(CSInputBuffer *input, size_t compressedSize, size_t decompressedSize)
+{
+	saved = 0;
+	repeat = 0;
+	halfescaped = false;
+	this->input = input;
+
+	return true;
+}
+
+bool CompactProRLEDecompressor::ReadBytes(void *dest, size_t numBytes)
+{
+	uint8_t *destBytes = static_cast<uint8_t*>(dest);
+
+	while (numBytes)
+	{
+		if (!EmitOneByte(*destBytes))
+			return false;
+
+		numBytes--;
+		destBytes++;
+	}
+
+	return true;
+}
+
+bool CompactProRLEDecompressor::EmitOneByte(uint8_t &b)
+{
+	if (repeat)
+	{
+		repeat--;
+		b = saved;
+		return true;
+	}
+
+	int byte;
+	if (halfescaped)
+	{
+		byte = 0x81;
+		halfescaped = true;
+	}
+	else
+	{
+		if (!CSInputNextByte(input, byte))
+			return false;
+	}
+
+	if (byte == 0x81)
+	{
+		if (!CSInputNextByte(input, byte))
+			return false;
+
+		if (byte == 0x82)
+		{
+			if (!CSInputNextByte(input, byte))
+				return false;
+
+			if (byte != 0)
+			{
+				repeat = byte - 2; // ?
+				b = saved;
+				return true;
+			}
+			else
+			{
+				repeat = 1;
+				saved = 0x82;
+				b = 0x81;
+				return true;
+			}
+		}
+		else
+		{
+			if (byte == 0x81)
+			{
+				halfescaped = true;
+				saved = 0x81;
+				b = saved;
+				return true;
+			}
+			else
+			{
+				repeat = 1;
+				saved = byte;
+				b = 0x81;
+				return true;
+			}
+		}
+	}
+	else
+	{
+		saved = byte;
+		b = saved;
+		return true;
+	}
+}