FloatUtils.cs

using System;
/*
** FloatUtils.cs
**
** Copyright (c) 2010-2016 Peter McQuillan
**
** All Rights Reserved.
**                       
** Distributed under the BSD Software License (see license.txt)  
***/

class FloatUtils
{
	
	
	internal static int read_float_info(WavpackStream wps, WavpackMetadata wpmd)
	{
		int bytecnt = wpmd.byte_length;
		byte[] byteptr = wpmd.data;
		int counter = 0;
		
		
		if (bytecnt != 4)
			return Defines.FALSE;
		
		wps.float_flags = byteptr[counter];
		counter++;
		wps.float_shift = byteptr[counter];
		counter++;
		wps.float_max_exp = byteptr[counter];
		counter++;
		wps.float_norm_exp = byteptr[counter];
		
		return Defines.TRUE;
	}
	
	
	internal static int[] float_values(WavpackStream wps, int[] values, long num_values, int bufferStartPos)
	{
		int shift = wps.float_max_exp - wps.float_norm_exp + wps.float_shift;
		int value_counter = bufferStartPos;
		
		if (shift > 32)
			shift = 32;
		else if (shift < - 32)
			shift = - 32;
		
		while (num_values > 0)
		{
			if (shift > 0)
				values[value_counter] <<= shift;
			else if (shift < 0)
				values[value_counter] >>= - shift;
			
			if (values[value_counter] > 8388607L)
				values[value_counter] = (int) SupportClass.Identity(8388607L);
			else if (values[value_counter] < - 8388608L)
				values[value_counter] = (int) SupportClass.Identity(- 8388608L);
			
			value_counter++;
			num_values--;
		}
		
		return values;
	}
}