/**
 * util.cpp
 * Yet Another SIP Stack
 * This file is part of the YATE Project http://YATE.null.ro 
 *
 * Yet Another Telephony Engine - a fully featured software PBX and IVR
 * Copyright (C) 2004 Null Team
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <telengine.h>

namespace TelEngine {

// Utility function, checks if a character is a folded line continuation
static bool isContinuation(char c)
{
    return ((c == ' ') || (c == '\t'));
}

// Utility function, returns an unfolded line and advances the pointer
String* getUnfoldedLine(const char** buf, int* len)
{
    String* res = new String;
    const char* b = *buf;
    const char* s = b;
    int l = *len;
    int e = 0;
    for (;(l > 0); ++b, --l) {
	bool goOut = false;
	switch (*b) {
	    case '\r':
		// CR is optional but skip over it if exists
		if ((l > 0) && (b[1] == '\n')) {
		    ++b;
		    --l;
		}
	    case '\n':
		++b;
		--l;
		{
		    String line(s,e);
		    *res << line;
		}
		// Skip over any continuation characters at start of next line
		goOut = true;
		while ((l > 1) && isContinuation(b[1])) {
		    ++b;
		    --l;
		    goOut = false;
		}
		s = b;
		if (isContinuation(s[0]))
		    ++s;
		e = 0;
		break;
	    case '\0':
		// Should not happen - but let's accept what we got
		*res << s;
		goOut = true;
		break;
	    default:
		// Just count this character - we'll pick it later
		++e;
	}
	// Exit without adjusting p and l
	if (goOut)
	    break;
    }
    *buf = b;
    *len = l;
    res->trimBlanks();
    return res;
}

}

/* vi: set ts=8 sw=4 sts=4 noet: */