/*
 * Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
 * Universitaet Berlin.  See the accompanying file "COPYRIGHT" for
 * details.  THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
 */

/* $Header$ */

#include "private.h"
#include "gsm.h"
#include "proto.h"

int gsm_explode P3((s, c, target), gsm s, gsm_byte * c, gsm_signal * target)
{
	/* GSM_MAGIC  = (*c >> 4) & 0xF; */

	if (((*c >> 4) & 0x0F) != GSM_MAGIC) return -1;

#define	LARc	target

	LARc[0]  = (*c++ & 0xF) << 2;		/* 1 */
	LARc[0] |= (*c >> 6) & 0x3;
	LARc[1]  = *c++ & 0x3F;
	LARc[2]  = (*c >> 3) & 0x1F;
	LARc[3]  = (*c++ & 0x7) << 2;
	LARc[3] |= (*c >> 6) & 0x3;
	LARc[4]  = (*c >> 2) & 0xF;
	LARc[5]  = (*c++ & 0x3) << 2;
	LARc[5] |= (*c >> 6) & 0x3;
	LARc[6]  = (*c >> 3) & 0x7;
	LARc[7]  = *c++ & 0x7;

#define	Nc	(target + 8)

	Nc[0]  = (*c >> 1) & 0x7F;

#define	bc	(target + 9)

	bc[0]  = (*c++ & 0x1) << 1;
	bc[0] |= (*c >> 7) & 0x1;

#define	Mc	(target + 10)

	Mc[0]  = (*c >> 5) & 0x3;

#define	xmaxc	(target + 11)

	xmaxc[0]  = (*c++ & 0x1F) << 1;
	xmaxc[0] |= (*c >> 7) & 0x1;

#define	xmc	(target + 12)

	xmc[0]  = (*c >> 4) & 0x7;
	xmc[1]  = (*c >> 1) & 0x7;
	xmc[2]  = (*c++ & 0x1) << 2;
	xmc[2] |= (*c >> 6) & 0x3;
	xmc[3]  = (*c >> 3) & 0x7;
	xmc[4]  = *c++ & 0x7;
	xmc[5]  = (*c >> 5) & 0x7;
	xmc[6]  = (*c >> 2) & 0x7;
	xmc[7]  = (*c++ & 0x3) << 1;		/* 10 */
	xmc[7] |= (*c >> 7) & 0x1;
	xmc[8]  = (*c >> 4) & 0x7;
	xmc[9]  = (*c >> 1) & 0x7;
	xmc[10]  = (*c++ & 0x1) << 2;
	xmc[10] |= (*c >> 6) & 0x3;
	xmc[11]  = (*c >> 3) & 0x7;
	xmc[12]  = *c++ & 0x7;

#undef	Nc
#define	Nc	(target + 25 - 1)

	Nc[1]  = (*c >> 1) & 0x7F;

#undef	bc
#define	bc	(target + 26 - 1)

	bc[1]  = (*c++ & 0x1) << 1;
	bc[1] |= (*c >> 7) & 0x1;

#undef	Mc
#define	Mc	(target + 27 - 1)

	Mc[1]  = (*c >> 5) & 0x3;

#undef 	xmaxc
#define	xmaxc	(target + 28 - 1)

	xmaxc[1]  = (*c++ & 0x1F) << 1;
	xmaxc[1] |= (*c >> 7) & 0x1;

#undef	xmc
#define	xmc	(target + 29 - 13)

	xmc[13]  = (*c >> 4) & 0x7;
	xmc[14]  = (*c >> 1) & 0x7;
	xmc[15]  = (*c++ & 0x1) << 2;
	xmc[15] |= (*c >> 6) & 0x3;
	xmc[16]  = (*c >> 3) & 0x7;
	xmc[17]  = *c++ & 0x7;
	xmc[18]  = (*c >> 5) & 0x7;
	xmc[19]  = (*c >> 2) & 0x7;
	xmc[20]  = (*c++ & 0x3) << 1;
	xmc[20] |= (*c >> 7) & 0x1;
	xmc[21]  = (*c >> 4) & 0x7;
	xmc[22]  = (*c >> 1) & 0x7;
	xmc[23]  = (*c++ & 0x1) << 2;
	xmc[23] |= (*c >> 6) & 0x3;
	xmc[24]  = (*c >> 3) & 0x7;
	xmc[25]  = *c++ & 0x7;

#undef	Nc
#define	Nc	(target + 42 - 2) 

	Nc[2]  = (*c >> 1) & 0x7F;

#undef	bc
#define	bc	(target + 43 - 2)

	bc[2]  = (*c++ & 0x1) << 1;		/* 20 */
	bc[2] |= (*c >> 7) & 0x1;

#undef	Mc
#define	Mc	(target + 44 - 2)

	Mc[2]  = (*c >> 5) & 0x3;

#undef	xmaxc
#define	xmaxc	(target + 45 - 2)

	xmaxc[2]  = (*c++ & 0x1F) << 1;
	xmaxc[2] |= (*c >> 7) & 0x1;

#undef	xmc
#define	xmc	(target + 46 - 26)

	xmc[26]  = (*c >> 4) & 0x7;
	xmc[27]  = (*c >> 1) & 0x7;
	xmc[28]  = (*c++ & 0x1) << 2;
	xmc[28] |= (*c >> 6) & 0x3;
	xmc[29]  = (*c >> 3) & 0x7;
	xmc[30]  = *c++ & 0x7;
	xmc[31]  = (*c >> 5) & 0x7;
	xmc[32]  = (*c >> 2) & 0x7;
	xmc[33]  = (*c++ & 0x3) << 1;
	xmc[33] |= (*c >> 7) & 0x1;
	xmc[34]  = (*c >> 4) & 0x7;
	xmc[35]  = (*c >> 1) & 0x7;
	xmc[36]  = (*c++ & 0x1) << 2;
	xmc[36] |= (*c >> 6) & 0x3;
	xmc[37]  = (*c >> 3) & 0x7;
	xmc[38]  = *c++ & 0x7;

#undef	Nc
#define	Nc	(target + 59 - 3)

	Nc[3]  = (*c >> 1) & 0x7F;

#undef	bc
#define	bc	(target + 60 - 3)

	bc[3]  = (*c++ & 0x1) << 1;
	bc[3] |= (*c >> 7) & 0x1;

#undef	Mc
#define	Mc	(target + 61 - 3)

	Mc[3]  = (*c >> 5) & 0x3;

#undef	xmaxc
#define	xmaxc	(target + 62 - 3)

	xmaxc[3]  = (*c++ & 0x1F) << 1;
	xmaxc[3] |= (*c >> 7) & 0x1;

#undef	xmc
#define	xmc	(target + 63 - 39)

	xmc[39]  = (*c >> 4) & 0x7;
	xmc[40]  = (*c >> 1) & 0x7;
	xmc[41]  = (*c++ & 0x1) << 2;
	xmc[41] |= (*c >> 6) & 0x3;
	xmc[42]  = (*c >> 3) & 0x7;
	xmc[43]  = *c++ & 0x7;			/* 30  */
	xmc[44]  = (*c >> 5) & 0x7;
	xmc[45]  = (*c >> 2) & 0x7;
	xmc[46]  = (*c++ & 0x3) << 1;
	xmc[46] |= (*c >> 7) & 0x1;
	xmc[47]  = (*c >> 4) & 0x7;
	xmc[48]  = (*c >> 1) & 0x7;
	xmc[49]  = (*c++ & 0x1) << 2;
	xmc[49] |= (*c >> 6) & 0x3;
	xmc[50]  = (*c >> 3) & 0x7;
	xmc[51]  = *c & 0x7;			/* 33 */

	return 0;
}