Annotation of libaitsync/src/patch.c, revision 1.5
1.2 misho 1: /*************************************************************************
2: * (C) 2010 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
3: * by Michael Pounov <misho@openbsd-bg.org>
4: *
5: * $Author: misho $
1.5 ! misho 6: * $Id: patch.c,v 1.4.6.2 2014/02/04 16:46:20 misho Exp $
1.2 misho 7: *
8: **************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
1.5 ! misho 15: Copyright 2004 - 2014
1.2 misho 16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
1.1 misho 46: #include "global.h"
47: #include "patch.h"
48:
49:
1.3 misho 50: /*
1.4 misho 51: * sync_buildPatch() - Build patch from buffer to pieces array
52: *
1.3 misho 53: * @buf = Input buffer
54: * @buflen = Buffer length
55: * @arr = Array from pieces
56: * return: -1 error, != -1 num pieces
57: */
58: int
59: sync_buildPatch(void * __restrict buf, u_int buflen, struct tagPiece ** __restrict arr)
1.1 misho 60: {
61: void *pos;
62: sync_chunk_t *prefix, *suffix;
63: struct tagPiece *a = *arr;
64: register int i;
65: u_int len = buflen;
66:
67: if (!buf || !arr)
68: return -1;
69:
1.5 ! misho 70: a = e_malloc(sizeof(struct tagPiece));
1.1 misho 71: if (!a) {
1.4 misho 72: LOGERR;
1.1 misho 73: return -1;
74: } else
75: memset(a, 0, sizeof(struct tagPiece));
76:
77: for (pos = buf, i = 0; len && pos < buf + buflen; i++) {
1.5 ! misho 78: a = e_realloc(a, sizeof(struct tagPiece) * (i + 2));
1.1 misho 79: if (!a) {
1.4 misho 80: LOGERR;
1.1 misho 81: return -1;
82: } else {
83: memset(&a[i + 1], 0, sizeof(struct tagPiece));
1.4 misho 84: #if 0
85: printf("start: %d.prefix_pos=%p len=%d\n", i, pos, len);
86: #endif
1.1 misho 87:
1.4 misho 88: /* prefix chunk */
1.1 misho 89: prefix = pos;
90: if (prefix->sc_magic != DLTSYNC_MAGIC) {
91: if (a) {
1.5 ! misho 92: e_free(a);
1.1 misho 93: a = NULL;
94: }
95: return -1;
96: } else {
97: a[i].pfx = prefix;
98: pos += sizeof(sync_chunk_t);
99: len -= sizeof(sync_chunk_t);
100: }
1.4 misho 101: #if 0
102: printf("prefix: %d.prefix=%p pos=%p len=%d\n", i, a[i].pfx, pos, len);
103: #endif
1.1 misho 104:
1.4 misho 105: /* data */
1.1 misho 106: if (!len) {
107: if (a) {
1.5 ! misho 108: e_free(a);
1.1 misho 109: a = NULL;
110: }
111: return -1;
112: } else {
113: a[i].buf = pos;
114: pos += prefix->sc_len;
115: len -= prefix->sc_len;
116: }
1.4 misho 117: #if 0
118: printf("data: %d.data=%p pos=%p len=%d\n", i, a[i].buf, pos, len);
119: #endif
1.1 misho 120:
1.4 misho 121: /* if find sync chunk */
1.1 misho 122: if (len) {
123: suffix = pos;
124: if (SIGSYNC_MAGIC == suffix->sc_magic) {
125: a[i].sfx = suffix;
126: pos += sizeof(sync_chunk_t);
127: len -= sizeof(sync_chunk_t);
128: }
1.4 misho 129: #if 0
130: printf("suffix: %d.data=%p pos=%p len=%d\n", i, a[i].sfx, pos, len);
131: #endif
1.1 misho 132: }
133: }
134: }
135:
136: *arr = a;
137: return i;
138: }
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