/* $Id: java.c,v 1.2 2010/07/04 17:49:02 khorben Exp $ */
/* Copyright (c) 2010 khorben of Uberwall */
/* 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 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 */



#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include "plugin.h"


/* java */
/* types */
#pragma pack(1)
struct header
{
	uint32_t magic;
	uint16_t minor_version;
	uint16_t major_version;
	uint16_t constant_pool;
};
#pragma pack()

/* variables */
/* magic */
static unsigned char sig1[] = "\xca\xfe\xba\xbe";
static unsigned char sig2[] = "<init>";

static PluginMagic java_magic[] =
{
	{ 0,	0,	sig1,	sizeof(sig1)-1	},
	{ 0,	0,	sig2,	sizeof(sig2)-1	},
	{ 0,	0,	NULL,	0		}
};


/* functions */
static int java_callback(PluginHelper * ph, int signature, FILE * fp);


/* plugin */
Plugin plugin =
{
	PT_EXECUTABLE,
	"JAVA",
	java_magic,
	java_callback
};


/* private */
static int _callback_header(PluginHelper * ph, struct header * hdr);

static int java_callback(PluginHelper * ph, int signature, FILE * fp)
{
	int score = 0;
	struct header buf;

	if(signature != 0)
		return 50;
	if(fread(&buf, sizeof(buf), 1, fp) != 1)
		return -1;
	buf.major_version = htob16(buf.major_version);
	buf.minor_version = htob16(buf.minor_version);
	buf.constant_pool = htob16(buf.constant_pool);
	score += _callback_header(ph, &buf);
	return score;
}

static int _callback_header(PluginHelper * ph, struct header * hdr)
{
	ph->printf(ph, "version %u.%u, %u constants in pool\n",
			hdr->major_version, hdr->minor_version,
			hdr->constant_pool);
	return 100;
}