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xdapply.c
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xdapply.c
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/* -*- Mode: C;-*-
*
* This file is part of XDelta - A binary delta generator.
*
* Copyright (C) 1997, 1998, 1999 Josh MacDonald
*
* 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; either version 2 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Author: Josh MacDonald <jmacd@CS.Berkeley.EDU>
*
* $Id: xdapply.c,v 1.1 2004/01/05 18:54:21 icculus Exp $
*/
#include <string.h>
#include <stdlib.h>
#include "xdelta.h"
#include "xdeltapriv.h"
/* This code used to be more general, but implemented a very
* inefficient algorithm. It is sufficient (and efficient) for the
* special case below, though, so I'm leaving it. */
static gboolean
xdp_copy_delta_region (XdeltaControl *cont,
XdeltaOutStream *output_stream)
{
gint i, l = cont->inst_len;
guint save_written = 0;
for (i = 0; i < l; i += 1)
{
const XdeltaInstruction *inst = cont->inst + i;
XdeltaSourceInfo* info;
if (inst->index >= cont->source_info_len)
{
xd_generate_int_event (EC_XdOutOfRangeSourceIndex, inst->index);
return FALSE;
}
info = cont->source_info[inst->index];
if (! handle_copy (info->in, output_stream, inst->offset, inst->length))
return FALSE;
save_written += inst->length;
}
return TRUE;
}
gboolean
xdp_apply_delta (XdeltaControl *cont,
XdeltaOutStream *res)
{
if (! xdp_copy_delta_region (cont, res))
return FALSE;
if (! handle_close (res, 0))
return FALSE;
if (! check_stream_integrity (res, cont->to_md5, cont->to_len))
{
int i;
/* to better report errors, check if the inputs were invalid now
*/
for (i = 0; i < cont->source_info_len; i += 1)
{
check_stream_integrity (cont->source_info[i]->in,
cont->source_info[i]->md5,
cont->source_info[i]->len);
}
return FALSE;
}
return TRUE;
}