1 /* -*- Mode: C;-*-
2 *
3 * This file is part of XDelta - A binary delta generator.
4 *
5 * Copyright (C) 1997, 1998, 1999 Josh MacDonald
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 * Author: Josh MacDonald <jmacd@CS.Berkeley.EDU>
22 *
23 * $Id: xdapply.c 1.1 Thu, 01 Apr 1999 23:29:11 -0800 jmacd $
24 */
25
26 #include <string.h>
27 #include <stdlib.h>
28
29 #include "xdelta.h"
30 #include "xdeltapriv.h"
31
32 /* This code used to be more general, but implemented a very
33 * inefficient algorithm. It is sufficient (and efficient) for the
34 * special case below, though, so I'm leaving it. */
35 static gboolean
xdp_copy_delta_region(XdeltaControl * cont,XdeltaOutStream * output_stream)36 xdp_copy_delta_region (XdeltaControl *cont,
37 XdeltaOutStream *output_stream)
38 {
39 gint i, l = cont->inst_len;
40 guint save_written = 0;
41
42 for (i = 0; i < l; i += 1)
43 {
44 const XdeltaInstruction *inst = cont->inst + i;
45 XdeltaSourceInfo* info;
46
47 if (inst->index >= cont->source_info_len)
48 {
49 xd_generate_int_event (EC_XdOutOfRangeSourceIndex, inst->index);
50 return FALSE;
51 }
52
53 info = cont->source_info[inst->index];
54
55 if (! handle_copy (info->in, output_stream, inst->offset, inst->length))
56 return FALSE;
57
58 save_written += inst->length;
59 }
60
61 return TRUE;
62 }
63
64 gboolean
xdp_apply_delta(XdeltaControl * cont,XdeltaOutStream * res)65 xdp_apply_delta (XdeltaControl *cont,
66 XdeltaOutStream *res)
67 {
68 if (! xdp_copy_delta_region (cont, res))
69 return FALSE;
70
71 if (! handle_close (res, 0))
72 return FALSE;
73
74 if (! check_stream_integrity (res, cont->to_md5, cont->to_len))
75 {
76 int i;
77
78 /* to better report errors, check if the inputs were invalid now
79 */
80 for (i = 0; i < cont->source_info_len; i += 1)
81 {
82 check_stream_integrity (cont->source_info[i]->in,
83 cont->source_info[i]->md5,
84 cont->source_info[i]->len);
85 }
86
87 return FALSE;
88 }
89
90 return TRUE;
91 }
92