137 lines
2.6 KiB
C++
137 lines
2.6 KiB
C++
/*
|
|
* 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
|