Annotation of libaitsync/src/patch.c, revision 1.2
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 $
! 6: * $Id: patch.c,v 1.1.1.1.2.2 2011/05/09 14:35:56 misho Exp $
! 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:
! 15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
! 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:
50: int sync_buildPatch(void * __restrict buf, u_int buflen, struct tagPiece ** __restrict arr)
51: {
52: void *pos;
53: sync_chunk_t *prefix, *suffix;
54: struct tagPiece *a = *arr;
55: register int i;
56: u_int len = buflen;
57:
58: if (!buf || !arr)
59: return -1;
60:
61: a = malloc(sizeof(struct tagPiece));
62: if (!a) {
63: SETERR;
64: return -1;
65: } else
66: memset(a, 0, sizeof(struct tagPiece));
67:
68: for (pos = buf, i = 0; len && pos < buf + buflen; i++) {
69: a = realloc(a, sizeof(struct tagPiece) * (i + 2));
70: if (!a) {
71: SETERR;
72: return -1;
73: } else {
74: memset(&a[i + 1], 0, sizeof(struct tagPiece));
75: // printf("%d.prefix_pos=%p len=%d\n", i, pos, len);
76:
77: // prefix chunk
78: prefix = pos;
79: if (prefix->sc_magic != DLTSYNC_MAGIC) {
80: if (a) {
81: free(a);
82: a = NULL;
83: }
84: return -1;
85: } else {
86: a[i].pfx = prefix;
87: pos += sizeof(sync_chunk_t);
88: len -= sizeof(sync_chunk_t);
89: }
90: // printf("%d.prefix=%p pos=%p len=%d\n", i, a[i].pfx, pos, len);
91:
92: // data
93: if (!len) {
94: if (a) {
95: free(a);
96: a = NULL;
97: }
98: return -1;
99: } else {
100: a[i].buf = pos;
101: pos += prefix->sc_len;
102: len -= prefix->sc_len;
103: }
104: // printf("%d.data=%p pos=%p len=%d\n", i, a[i].buf, pos, len);
105:
106: // if find sync chunk
107: if (len) {
108: suffix = pos;
109: if (SIGSYNC_MAGIC == suffix->sc_magic) {
110: a[i].sfx = suffix;
111: pos += sizeof(sync_chunk_t);
112: len -= sizeof(sync_chunk_t);
113: }
114: // printf("%d.data=%p pos=%p len=%d\n", i, a[i].sfx, pos, len);
115: }
116: }
117: }
118:
119: *arr = a;
120: return i;
121: }
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