sources.cpp

DVB-S的softcam源代码

/*
 * sources.c: Source handling
 *
 * See the main source file 'vdr.c' for copyright information and
 * how to reach the author.
 *
 * $Id: sources.c 1.3 2004/12/26 11:58:52 kls Exp $
 */

#include "sources.h"
#include <ctype.h>
#include <stdio.h>

// -- cSource ----------------------------------------------------------------

cString cSource::ToString(int Code)
{
	char buffer[16];
	char *q = buffer;
	switch (Code & st_Mask) {
		case stCable: *q++ = 'C'; break;
		case stSat:   *q++ = 'S';
						{
							int pos = Code & ~st_Mask;
							q += _snprintf(q, sizeof(buffer) - 2, "%u.%u", (pos & ~st_Neg) / 10, (pos & ~st_Neg) % 10); // can't simply use "%g" here since the silly 'locale' messes up the decimal point
							*q++ = (Code & st_Neg) ? 'E' : 'W';
						}
						break;
		case stTerr:  *q++ = 'T'; break;
		default:      *q++ = Code + '0'; // backward compatibility
	}
	*q = 0;
	return buffer;
}

int cSource::FromString(const char *s)
{
	int type = stNone;
	switch (toupper(*s)) {
		case 'C': type = stCable; break;
		case 'S': type = stSat;   break;
		case 'T': type = stTerr;  break;
		case '0':
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7':
		case '8':
		case '9': type = *s - '0'; break; // backward compatibility
		default: printf("ERROR: unknown source key '%c'", *s);
				return stNone;
	}
	int code = type;
	if (type == stSat) {
		int pos = 0;
		bool dot = false;
		bool neg = false;
		while (*++s) {
			switch (toupper(*s)) {
				case '0':
				case '1':
				case '2':
				case '3':
				case '4':
				case '5':
				case '6':
				case '7':
				case '8':
				case '9': pos *= 10;
							pos += *s - '0';
							break;
				case '.': dot = true;
							break;
				case 'E': neg = true; // fall through to 'W'
				case 'W': if (!dot)
							pos *= 10;
							break;
				default: printf("ERROR: unknown source character '%c'", *s);
						return stNone;
			}
		}
		if (neg)
			pos |= st_Neg;
		code |= pos;
	}
	return code;
}