Initial source commit

minorGems/graphics/converters/LittleEndianImageConverter.h

@@ -0,0 +1,137 @@
+/*
+ * Modification History
+ *
+ * 2001-September-22   Jason Rohrer
+ * Created.
+ */
+ 
+ 
+#ifndef LITTLE_ENDIAN_IMAGE_CONVERTER_INCLUDED
+#define LITTLE_ENDIAN_IMAGE_CONVERTER_INCLUDED 
+
+
+#include "minorGems/graphics/ImageConverter.h"
+
+
+/**
+ * A base class for converters that have little endian file formats.
+ * Basically includes little endian reading and writing functions.
+ *
+ * @author Jason Rohrer
+ */
+class LittleEndianImageConverter : public ImageConverter {
+	
+	public:
+		
+		// does not implement the ImageConverter interface,
+		// which makes this class abstract.
+
+		
+	protected:
+
+		/**
+		 * Writes a long value in little endian format.
+		 *
+		 * @param inLong the long value to write.
+		 * @param inStream the stream to write inLong to.
+		 */
+		void writeLittleEndianLong( long inLong, 
+			OutputStream *inStream );
+
+
+
+		/**
+		 * Writes a short value in little endian format.
+		 *
+		 * @param inShort the short value to write.
+		 * @param inStream the stream to write inShort to.
+		 */
+		void writeLittleEndianShort( short inShort, 
+			OutputStream *inStream );
+
+
+
+		/**
+		 * Reads a long value in little endian format.
+		 *
+		 * @param inStream the stream to read the long value from.
+		 *
+		 * @return the long value.
+		 */
+		long readLittleEndianLong( InputStream *inStream );
+
+
+
+		/**
+		 * Reads a short value in little endian format.
+		 *
+		 * @param inStream the stream to read the short value from.
+		 *
+		 * @return the short value.
+		 */
+		short readLittleEndianShort( InputStream *inStream );
+
+
+		
+	};
+
+
+
+inline void LittleEndianImageConverter::writeLittleEndianLong( long inLong, 
+	OutputStream *inStream ) {
+	
+	unsigned char buffer[4];
+	
+	buffer[0] = (unsigned char)( inLong & 0xFF );
+	buffer[1] = (unsigned char)( ( inLong >> 8 ) & 0xFF );
+	buffer[2] = (unsigned char)( ( inLong >> 16 ) & 0xFF );
+	buffer[3] = (unsigned char)( ( inLong >> 24 ) & 0xFF );
+	
+	inStream->write( buffer, 4 );
+	}
+
+
+
+inline long LittleEndianImageConverter::readLittleEndianLong(
+	InputStream *inStream ) {
+
+	unsigned char buffer[4];
+	
+	inStream->read( buffer, 4 );
+	
+	long outLong = buffer[0] | ( buffer[1] << 8 ) | ( buffer[2] << 16 )
+		| ( buffer[3] << 24 );
+	
+	return outLong;
+	}
+
+
+
+inline void LittleEndianImageConverter::writeLittleEndianShort( short inShort, 
+	OutputStream *inStream ) {
+	
+	unsigned char buffer[2];
+	
+	buffer[0] = (unsigned char)( inShort & 0xFF );
+	buffer[1] = (unsigned char)( ( inShort >> 8 ) & 0xFF );
+	
+	inStream->write( buffer, 2 );
+	}
+
+
+
+inline short LittleEndianImageConverter::readLittleEndianShort(
+	InputStream *inStream ) {
+
+	unsigned char buffer[2];
+	
+	inStream->read( buffer, 2 );
+	
+	long outShort = buffer[0] | ( buffer[1] << 8 );
+	
+	return outShort;
+	}
+
+
+		
+#endif