/*************************************************************************
* (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: aitsync.h,v 1.1 2010/03/24 16:00:15 misho Exp $
*
*************************************************************************/
#ifndef __AITSYNC_H
#define __AITSYNC_H


#include <sys/types.h>
#include <openssl/md5.h>


#define CHUNK_MAX	2048
#define DLTSYNC_MAGIC	0xD34DC0D3
#define SIGSYNC_MAGIC	0xDEADBEEF


typedef struct tagSyncChunk {
	u_int sc_magic;
	u_long sc_id;
	off_t sc_off;
	size_t sc_len;
	u_int sc_roll;
	u_char sc_cksum[MD5_DIGEST_LENGTH];
} sync_chunk_t;


// -------------------------------------------------------
// sync_GetErrno() Get error code of last operation
inline int sync_GetErrno();
// sync_GetError() Get error text of last operation
inline const char *sync_GetError();
// -------------------------------------------------------

/*
 * syncSignature() Calculate and create signature for diff
 * @csInput = Input patched file name for calculating check sums
 * @csSig = Output Signature file name
 * return: -1 error, 0 ok
 */
int syncSignature(const char *csInput, const char *csSig);

/*
 * syncDelta() Create Delta patch file
 * @csInput = Input original source file name for make delta patch file
 * @csSig = Input Signature file name
 * @csDelta = Output Delta patch file name
 * @compress = Compress output, 0 not compressed
 * return: -1 error, 0 ok, create delta patch, 1 ok, no differences and not create patch
 */
int syncDelta(const char *csInput, const char *csSig, const char *csDelta, int compress);

/*
 * syncPatch() Apply delta patch file to target
 * @csInput = Input target file name for patch
 * @csDelta = Input Delta patch file name
 * @csPatch = After applied patch create new alternate target file, if != NULL
 * @compress = Compress output, 0 not compressed
 * return: -1 error, 0 ok, create delta patch, 1 ok, no differences and not create patch
 */
int syncPatch(const char *csInput, const char *csDelta, const char *csPatch, int compress);


#endif