File: gdproto.c

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/*				       	-*- c-file-style: "bsd" -*-
 * rproxy -- dynamic caching and delta update in HTTP
 * $Id: gdproto.c,v 1.7 2000/08/06 12:50:36 mbp Exp $
 * 
 * Copyright (C) 1999, 2000 by Martin Pool <mbp@humbug.org.au>
 * Copyright (C) 1999 by Andrew Tridgell
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 * 
 * 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include "includes.h"
#include "protocol.h"

int
_hs_read_blocksize(hs_read_fn_t sigread_fn, void *sigreadprivate,
		   int *block_len)
{
    int             ret;
    uint32_t		len;

    ret = _hs_read_netint(sigread_fn, sigreadprivate, &len);
    *block_len = len;
    if (ret < 0) {
	_hs_error("couldn't read block length from signature");
	return -1;
    } else if (ret != 4) {
	_hs_error("short read while trying to get block length");
	return -1;
    }

    _hs_trace("The block length is %d", *block_len);

    return 0;
}



int
_hs_littok_header(hs_write_fn_t write_fn, void *write_priv)
{
    int             ret;

    /* 
     * Write the protocol version the token stream follows to the token
     * stream 
     */
    ret = _hs_write_netint(write_fn, write_priv, HS_LT_MAGIC);
    if (ret < 0) {
	_hs_fatal("error writing version to littok stream");
	return -1;
    }

    return 0;
}



int
_hs_check_sig_version(hs_read_fn_t sigread_fn, void *sigreadprivate)
{
    uint32_t        hs_remote_version;
    const uint32_t  expect = HS_SIG_MAGIC;
    int             ret;

    ret = _hs_read_netint(sigread_fn, sigreadprivate, &hs_remote_version);
    if (ret == 0) {
	_hs_trace("eof on old signature stream before reading version; "
		  "there is no old signature");
	return 0;
    } else if (ret < 0) {
	_hs_fatal("error reading signature version");
	return -1;
    } else if (ret != 4) {
	_hs_fatal("bad-sized read while trying to get signature version");
	return -1;
    }

    if (hs_remote_version != expect) {
	_hs_fatal("this librsync understands version %#010x."
		  " We don't take %#010x.", expect, hs_remote_version);
	errno = EBADMSG;
	return -1;
    }

    return 1;
}

int
_hs_newsig_header(int new_block_len,
		  hs_write_fn_t write_fn, void *writeprivate)
{
    int             ret;

    ret = _hs_write_netint(write_fn, writeprivate, HS_SIG_MAGIC);
    if (ret < 0)
	return -1;

    ret = _hs_write_netint(write_fn, writeprivate, new_block_len);
    if (ret < 0)
	return -1;

    return 0;
}