/*
 * LPC 2000 Loader, http://www.pjrc.com/arm/lpc2k_pgm
 * Copyright (c) 2004, PJRC.COM, LLC, <paul@pjrc.com>
 *
 * 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.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

/* If this code fails to build, please provide at least the following
 * information when requesting (free) technical support.
 * 
 * 1: Complete copy of all messages during the build.
 * 2: Output of "gtk-config --version"
 * 3: Output of "gtk-config --libs"
 * 4: Output of "gtk-config --cflags"
 * 5: Output of "uname -a"
 * 6: Version of GTK installed... eg, type: ls -l /lib/libgtk*
 * 7: Other info... which linux distribution, version, other software
 */

#include "uuencode.h"

static char uuchar(unsigned int val);


void uuencode(char *str, const unsigned char *data, int num)
{
	int i, n;
	unsigned int val;

	*str++ = uuchar(num);

	n = (num + 2) / 3;
	for (i=0; i<n; i++) {
		val = ((data[0] & 0xFF) << 16)
		   |  ((data[1] & 0xFF) << 8)
		   |  ((data[2] & 0xFF) << 0);
		*str++ = uuchar(val >> 18);
		*str++ = uuchar(val >> 12);
		*str++ = uuchar(val >>  6);
		*str++ = uuchar(val >>  0);
		data += 3;
	}
	*str = '\0';
}

int uudecode(const char *str, unsigned char *data, int max)
{
	int num=0;
	int i, n;
	unsigned int val;

	if (*str == '\0') return 0;

	num = *str++ - 32;
	if (num < 1 || num > 45) return 0;

	n = (num + 2) / 3;
	for (i=0; i<n; i++) {
		if (str[0] < 32 || str[0] > 96) return 0;
		if (str[1] < 32 || str[1] > 96) return 0;
		if (str[2] < 32 || str[2] > 96) return 0;
		if (str[3] < 32 || str[3] > 96) return 0;
		val = (((str[0] - 32) & 0x3F) << 18)
		   |  (((str[1] - 32) & 0x3F) << 12)
		   |  (((str[2] - 32) & 0x3F) << 6)
		   |  (((str[3] - 32) & 0x3F) << 0);
		*data++ = (val >> 16) & 0xFF;
		*data++ = (val >> 8) & 0xFF;
		*data++ = (val >> 0) & 0xFF;
		str += 4;
	}
	return num;
}


static char uuchar(unsigned int val)
{
	val &= 0x3F;
	val += 0x20;
	if (val == 0x20) val = 0x60;
	return val;
}