Add unpacktool

unpacktool/RLE90Decompressor.cpp

@@ -0,0 +1,72 @@
+#include "RLE90Decompressor.h"
+
+#include "CSInputBuffer.h"
+
+RLE90Decompressor::RLE90Decompressor()
+	: m_input(nullptr)
+	, m_repeatedByte(0)
+	, m_count(0)
+{
+}
+
+bool RLE90Decompressor::Reset(CSInputBuffer *input, size_t compressedSize, size_t decompressedSize)
+{
+	m_input = input;
+	m_repeatedByte = 0;
+	m_count = 0;
+	return true;
+}
+
+bool RLE90Decompressor::ReadBytes(void *dest, size_t numBytes)
+{
+	uint8_t *destBytes = static_cast<uint8_t*>(dest);
+	for (size_t i = 0; i < numBytes; i++)
+	{
+		if (m_count)
+		{
+			m_count--;
+			destBytes[i] = m_repeatedByte;
+		}
+		else
+		{
+			bool isEOF;
+			if (!CSInputAtEOF(m_input, isEOF))
+				return false;
+
+			if (isEOF)
+				return false;
+
+			int b;
+			if (!CSInputNextByte(m_input, b))
+				return false;
+
+			if (b != 0x90)
+			{
+				destBytes[i] = b;
+				m_repeatedByte = b;
+			}
+			else
+			{
+				int c;
+				if (!CSInputNextByte(m_input, c))
+					return false;
+
+				if (c == 0)
+				{
+					m_repeatedByte = 0x90;
+					destBytes[i] = 0x90;
+				}
+				else
+				{
+					if (c == 1)
+						return false;
+					m_count = c - 2;
+					destBytes[i] = m_repeatedByte;
+				}
+			}
+		}
+	}
+
+	return true;
+}
+