unpack.h

来自「g729 coding ipaddressing」· C头文件 代码 · 共 57 行

/**************************************************************************
*
* ROUTINE
*				unpack (unpack from binary to decimal)
*
* FUNCTION
*				Input binary array and number of binary bits,
*				program returns unpacked decimal value.
*
* SYNOPSIS
*				subroutine unpack(array, bits, value, pointer)
*
*	formal
*
*						data	I/O
*		name			type	type	function
*		-------------------------------------------------------------------
*		array			short	i		array to which one bit is assigned
*										for binary representation
*		bits			int 	i		number of bits to convert
*										(ie. 01001 for 5 bits, 1st 0 incl.)
*		value			int 	o		decimal value to convert to
*		pointer 		int 	i/o 	points to appropriate element in
*										array
*
***************************************************************************
*
* DESCRIPTION
*
*		This program unpacks binary values packed by pack.c
*		into decimal values.
*
***************************************************************************
*
* CALLED BY
*
*		celp  dcodcbg  dcodcbi	dcodpg	dcodtau
*
* CALLS
*
*
*
***************************************************************************
*
* REFERENCES
*
*
**************************************************************************/

static void unpack(const short array[], int bits, int *value, int *a_pointer)
{
  int i;

  for (i = 0, *value = 0; i < bits; i++, (*a_pointer)++)
	*value |= array[*a_pointer+1] << i;
}