Rename 'Standard Gaming Platform' to 'sgp' (#246)

* rename 'Standard Gaming Platform' to 'sgp'

* Adapt CMakeLists.txt files to renamed SGP directory

* Lowercase it

sgp/Compression.cpp

@@ -0,0 +1,159 @@
+	#include "MemMan.h"
+	#include "debug.h"
+	#include "zlib.h"
+
+
+// mem allocation functions for ZLIB's purposes
+
+voidpf ZAlloc( voidpf opaque, uInt items, uInt size )
+{
+	return( MemAlloc( items * size ) );
+}
+
+void ZFree( voidpf opaque, voidpf address )
+{
+	MemFree( address );
+}
+
+PTR DecompressInit( PTR pCompressedData, UINT32 uiDataSize )
+{
+	z_stream *	pZStream;
+	int					iZRetCode;
+
+	// allocate memory for the z_stream struct
+	pZStream = (z_stream *)MemAlloc( sizeof( z_stream ) );
+	if( pZStream == NULL )
+	{ // out of memory!
+		return( NULL );
+	}
+
+	// initial defines
+	pZStream->zalloc = ZAlloc;
+	pZStream->zfree = ZFree;
+	pZStream->opaque = NULL;
+
+	// call the ZLIB init routine
+	iZRetCode = inflateInit( pZStream );
+	if( iZRetCode != Z_OK )
+	{ // ZLIB init error!
+		MemFree( pZStream );
+		return( NULL );
+	}
+
+	// set up our parameters
+	pZStream->next_in = (BYTE*)pCompressedData;
+	pZStream->avail_in = uiDataSize;
+	return( (PTR) pZStream );
+}
+
+UINT32 Decompress( PTR pDecompPtr, BYTE * pBuffer, UINT32 uiBufferLen )
+{
+	int					iZRetCode;
+	z_stream *	pZStream = (z_stream *) pDecompPtr;
+
+	// these assertions is in here to ensure that we get passed a proper z_stream pointer
+	Assert( pZStream != NULL );
+	Assert( pZStream->zalloc == ZAlloc );
+
+	if (pZStream->avail_in == 0)
+	{ // There is nothing left to decompress!
+		return( 0 );
+	}
+
+	// set up the z_stream with our parameters
+	pZStream->next_out = pBuffer;
+	pZStream->avail_out = uiBufferLen;
+
+	// decompress!
+	iZRetCode = inflate( pZStream, Z_PARTIAL_FLUSH );
+	Assert( iZRetCode == Z_OK || iZRetCode == Z_STREAM_END );
+
+	return( uiBufferLen - pZStream->avail_out );
+}
+
+void DecompressFini( PTR pDecompPtr )
+{
+	z_stream *	pZStream = (z_stream *) pDecompPtr;
+
+	// these assertions is in here to ensure that we get passed a proper z_stream pointer
+	Assert( pZStream != NULL );
+	Assert( pZStream->zalloc == ZAlloc );
+
+	inflateEnd( pZStream );
+	MemFree( pZStream );
+}
+
+UINT32 CompressedBufferSize( UINT32 uiDataSize )
+{ // Function that calculates the worst-case buffer size needed to
+	// hold uiDataSize bytes compressed
+
+	return( uiDataSize + uiDataSize / 10 + 13 );
+}
+
+PTR CompressInit( BYTE * pUncompressedData, UINT32 uiDataSize )
+{
+	z_stream *	pZStream;
+	int					iZRetCode;
+
+	// allocate memory for the z_stream struct
+	pZStream = (z_stream *)MemAlloc( sizeof( z_stream ) );
+	if( pZStream == NULL )
+	{ // out of memory!
+		return( NULL );
+	}
+
+	// initial defines
+	pZStream->zalloc = ZAlloc;
+	pZStream->zfree = ZFree;
+	pZStream->opaque = NULL;
+
+	// call the ZLIB init routine
+	iZRetCode = deflateInit( pZStream, Z_BEST_COMPRESSION );
+	if( iZRetCode != Z_OK )
+	{ // ZLIB init error!
+		MemFree( pZStream );
+		return( NULL );
+	}
+
+	// set up our parameters
+	pZStream->next_in = pUncompressedData;
+	pZStream->avail_in = uiDataSize;
+	return( (PTR) pZStream );
+}
+
+UINT32 Compress( PTR pCompPtr, BYTE * pBuffer, UINT32 uiBufferLen )
+{
+	int					iZRetCode;
+	z_stream *	pZStream = (z_stream *) pCompPtr;
+
+	// these assertions is in here to ensure that we get passed a proper z_stream pointer
+	Assert( pZStream != NULL );
+	Assert( pZStream->zalloc == ZAlloc );
+
+	if (pZStream->avail_in == 0)
+	{ // There is nothing left to compress!
+		return( 0 );
+	}
+
+	// set up the z_stream with our parameters
+	pZStream->next_out = pBuffer;
+	pZStream->avail_out = uiBufferLen;
+
+	// decompress!
+	iZRetCode = deflate( pZStream, Z_FINISH );
+	Assert( iZRetCode == Z_STREAM_END );
+
+	return( uiBufferLen - pZStream->avail_out );
+}
+
+void CompressFini( PTR pCompPtr )
+{
+	z_stream *	pZStream = (z_stream *) pCompPtr;
+
+	// these assertions is in here to ensure that we get passed a proper z_stream pointer
+	Assert( pZStream != NULL );
+	Assert( pZStream->zalloc == ZAlloc );
+
+	deflateEnd( pZStream );
+	MemFree( pZStream );
+}