FloatUtils.cs

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

namespace WavPack
{
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++];
		wps.float_shift = byteptr[counter++];
		wps.float_max_exp = byteptr[counter++];
		wps.float_norm_exp = byteptr[counter++];

		return Defines.TRUE;
	}

	internal static void 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] > 8388607)
				values[value_counter] = 8388607;
			else if (values[value_counter] < -8388608)
				values[value_counter] = -8388608;

			value_counter++;
		}
	}
}
}