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libaitsync Delta patch library

    1: /*************************************************************************
    2: * (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
    3: *  by Michael Pounov <misho@openbsd-bg.org>
    4: *
    5: * $Author: misho $
    6: * $Id: tool.c,v 1.1.1.1 2010/03/24 16:00:15 misho Exp $
    7: *
    8: *************************************************************************/
    9: #include "global.h"
   10: #include "tool.h"
   11: 
   12: 
   13: /*
   14:  * sync_mksig() Make signature from chunk
   15:  * @id = chunk id
   16:  * @off = file offset
   17:  * @buf = chunk buffer for calculate signature
   18:  * @buflen = buffer length in bytes
   19:  * @sc = Chunk structure for fill
   20: */
   21: inline void sync_mksig(int id, off_t off, u_char * __restrict buf, int buflen, sync_chunk_t * __restrict sc)
   22: {
   23: 	MD5_CTX ctx;
   24: 
   25: 	MD5_Init(&ctx);
   26: 	memset(sc, 0, sizeof(sync_chunk_t));
   27: 	sc->sc_magic = DLTSYNC_MAGIC;
   28: 	sc->sc_id = id;
   29: 	sc->sc_off = off;
   30: 	sc->sc_len = buflen;
   31: 	sc->sc_roll = crcAdler(buf, buflen);
   32: 	MD5_Update(&ctx, buf, buflen);
   33: 	MD5_Final(sc->sc_cksum, &ctx);
   34: }
   35: 
   36: /*
   37:  * syncWriteNum() Write to handle converted number to bigendian
   38:  * @f = handle
   39:  * @ulNum = number to convert
   40:  * @nNumLen = length of number to bytes
   41:  * return: -1 error, != -1 writed bytes to handle
   42: */
   43: inline int syncWriteNum(int f, u_long ulNum, int nNumLen)
   44: {
   45: 	u_char buf[sizeof ulNum];
   46: 	register int i;
   47: 
   48: 	if (nNumLen < 1 || nNumLen > ULONG_MAX) {
   49: 		syncSetErr(-1, "Illegal number len %d\n", nNumLen);
   50: 		return -1;
   51: 	}
   52: 
   53: 	for (i = nNumLen - 1; i; i--) {
   54: 		buf[i] = (u_char) ulNum;
   55: 		ulNum >>= 8;
   56: 	}
   57: 
   58: 	return write(f, buf, nNumLen);
   59: }