/*
 * Copyright 2010. Ivan Voras <ivoras@freebsd.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * Helper library for comparing files through hashing.
 */

#include <sys/types.h>
#include <pthread.h>
#include <string.h>
#include <assert.h>
#include <err.h>
#include <md5.h>
#include <sha256.h>

#include "hashjob.h"


static void *
hashjob_md5(void *arg)
{
	struct hashjob *job = arg;

	assert(job->filename != NULL);
	job->hash_len = 32;
	memset(job->hash, 0, HASH_MAX_LEN);
	assert(MD5File(job->filename, job->hash) != NULL);
	return (job);
}


static void *
hashjob_sha256(void *arg)
{
	struct hashjob *job = arg;

	assert(job->filename != NULL);
	job->hash_len = 64;
	memset(job->hash, 0, HASH_MAX_LEN);
	assert(SHA256_File(job->filename, job->hash) != NULL);
	return (job);
}


int
hashjob_start(struct hashjob *job, char *filename, enum HASH_TYPE type)
{
	job->filename = filename;
	job->finished = 0;
	if (type == HASH_MD5)
		return (pthread_create(&job->thread, NULL, hashjob_md5, job));
	else if (type == HASH_SHA256)
		return (pthread_create(&job->thread, NULL, hashjob_sha256, job));
	else
		return (-1);
}


int
hashjob_finish(struct hashjob *job)
{
	void *ret;
	int rval;

	if (job->finished)
		return 0;
	rval = pthread_join(job->thread, &ret);
	job->finished = 1;
	return (rval);
}