/*
 * Our band and ARFCN tables and lookup code live here.
 */

#include <string.h>
#include <strings.h>
#include "band.h"
#include "secaddr.h"

struct arfcn_range band850_arfcn_range =     {128,  251,  824200,  869200};
struct arfcn_range band900_arfcn_range =     {  0,  124,  890000,  935000};
struct arfcn_range band900_arfcn_range_ext = {975, 1023,  880200,  925200};
struct arfcn_range band1800_arfcn_range =    {512,  885, 1710200, 1805200};
struct arfcn_range band1900_arfcn_range =    {512,  810, 1850200, 1930200};

struct band supported_bands[] = {
	{"850",  SECADDR_GSM850MS_NSIG,  &band850_arfcn_range,  0},
	{"900",  SECADDR_GSM900MS_NSIG,  &band900_arfcn_range,
					 &band900_arfcn_range_ext},
	{"1800", SECADDR_GSM1800MS_NSIG, &band1800_arfcn_range, 0},
	{"1900", SECADDR_GSM1900MS_NSIG, &band1900_arfcn_range, 0},
	{0,	 0,			 0,			0}
};

struct band *current_band;

find_named_band(srchname)
	char *srchname;
{
	struct band *band;

	for (band = supported_bands; band->name; band++)
		if (!strcmp(band->name, srchname))
			break;
	if (!band->name)
		return(-1);
	current_band = band;
	return(0);
}

check_arfcn_range(range, arfcn, ulp, dlp)
	struct arfcn_range *range;
	unsigned arfcn, *ulp, *dlp;
{
	if (arfcn < range->min)
		return(-1);
	if (arfcn > range->max)
		return(-1);
	if (ulp)
		*ulp = range->ul_khz + (arfcn - range->min) * 200;
	if (dlp)
		*dlp = range->dl_khz + (arfcn - range->min) * 200;
	return(0);
}

verify_arfcn(arfcn, ulp, dlp)
	unsigned arfcn, *ulp, *dlp;
{
	if (!check_arfcn_range(current_band->arfcn_range, arfcn, ulp, dlp))
		return(0);
	if (current_band->arfcn_range_ext &&
	    !check_arfcn_range(current_band->arfcn_range_ext, arfcn, ulp, dlp))
		return(0);
	return(-1);
}