--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/python/sis2rom/sis/sisreader.py	Wed Jan 27 10:52:27 2010 +0000
@@ -0,0 +1,150 @@
+"""
+Copyright (c) 2006, Jari Sukanen
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or 
+without modification, are permitted provided that the following 
+conditions are met:
+	* Redistributions of source code must retain the above copyright 
+	  notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright 
+	  notice, this list of conditions and the following disclaimer in 
+	  the documentation and/or other materials provided with the 
+	  distribution.
+    * Names of the contributors may not be used to endorse or promote 
+	  products derived from this software without specific prior written 
+	  permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
+PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
+THE POSSIBILITY OF SUCH DAMAGE.
+"""
+
+
+import struct
+import sisfields
+
+class SISReader :
+	def __init__(self) :
+		pass
+		
+	def readUnsignedBytes(self, numBytes) :
+		buf = self.readPlainBytes(numBytes)
+		if len(buf) < numBytes :
+			return []
+			
+		format = ""
+		for i in range(numBytes) :
+			format += "B"
+		return struct.unpack(format, buf)
+	
+	def readSignedBytes(self, numBytes) :
+		buf = self.readPlainBytes(numBytes)
+		if len(buf) < numBytes :
+			return []
+			
+		format = ""
+		for i in range(numBytes) :
+			format += "b"
+		return struct.unpack(format, buf)
+		
+	def readBytesAsUint(self, numBytes) :
+		result = 0
+		bytes = self.readUnsignedBytes(numBytes)
+		if len(bytes) == numBytes :
+			for i in range(numBytes) :
+				result |= bytes[i] << (i*8)
+		
+		return result
+		
+	def readBytesAsInt(self, numBytes) :
+		result = 0
+		bytes = self.readSignedBytes(numBytes)
+		if len(bytes) == numBytes :
+			for i in range(numBytes) :
+				result |= bytes[i] << (i*8)
+		
+		return result
+		
+	def skipPadding(self) :
+		result = 0
+		if self.bytesRead % 4 != 0 :
+			paddingLength = 4 - self.bytesRead % 4
+			self.readPlainBytes(paddingLength)
+			result = paddingLength
+			
+		return result
+	
+
+class SISFileReader(SISReader) : 
+	def __init__(self, inStream) :
+		self.inStream = inStream
+		self.eof = False
+		self.bytesRead = 0
+
+	def readPlainBytes(self, numBytes) :
+		if self.eof :
+			return ""
+			
+		if numBytes == 0 :
+			return ""
+			
+		buf = ""
+		buf = self.inStream.read(numBytes)
+		if len(buf) < numBytes :
+			self.eof = True
+			return ""
+			
+		self.bytesRead += numBytes
+		
+		return buf
+
+	def isEof(self) :
+		return self.eof
+		
+class SISBufferReader(SISReader) :
+	def __init__(self, buffer) :
+		self.buffer = buffer
+		self.bytesRead = 0
+		
+	def readPlainBytes(self, numBytes) :
+		if self.isEof() :
+			return ""
+			
+		if numBytes == 0 :
+			return ""
+			
+		result = self.buffer[self.bytesRead:self.bytesRead+numBytes]
+			
+		self.bytesRead += numBytes
+		
+		return result
+			
+	def isEof(self) :
+		return self.bytesRead >= len(self.buffer)
+		
+class SISFieldParser :
+	def __init__(self) :
+		self.lastReadBytes = 0
+		
+	def parseField(self, fileReader) :
+		"""Reads the next field from the fileReader stream and returns it"""
+		field = None
+		self.lastReadBytes = 0
+		type = fileReader.readBytesAsUint(4)
+		self.lastReadBytes += 4
+		if type != 0 :
+			field = sisfields.SISFieldTypes[type]()
+			field.type = type
+			field.initFromFile(fileReader)
+			self.lastReadBytes += field.length + 4 # Field length + length field
+			self.lastReadBytes += fileReader.skipPadding()
+		return field