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Annotation of libaitsync/src/patch.c, revision 1.3

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 $
1.3     ! misho       6: * $Id: patch.c,v 1.2.2.2 2012/07/22 22:09:18 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: 
1.3     ! misho      15: Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
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: /*
        !            51:  * sync_buildPatch() Build patch from buffer to pieces array
        !            52:  * @buf = Input buffer
        !            53:  * @buflen = Buffer length
        !            54:  * @arr = Array from pieces
        !            55:  * return: -1 error, != -1 num pieces
        !            56: */
        !            57: int
        !            58: sync_buildPatch(void * __restrict buf, u_int buflen, struct tagPiece ** __restrict arr)
1.1       misho      59: {
                     60:        void *pos;
                     61:        sync_chunk_t *prefix, *suffix;
                     62:        struct tagPiece *a = *arr;
                     63:        register int i;
                     64:        u_int len = buflen;
                     65: 
                     66:        if (!buf || !arr)
                     67:                return -1;
                     68: 
                     69:        a = malloc(sizeof(struct tagPiece));
                     70:        if (!a) {
                     71:                SETERR;
                     72:                return -1;
                     73:        } else
                     74:                memset(a, 0, sizeof(struct tagPiece));
                     75: 
                     76:        for (pos = buf, i = 0; len && pos < buf + buflen; i++) {
                     77:                a = realloc(a, sizeof(struct tagPiece) * (i + 2));
                     78:                if (!a) {
                     79:                        SETERR;
                     80:                        return -1;
                     81:                } else {
                     82:                        memset(&a[i + 1], 0, sizeof(struct tagPiece));
                     83:                        // printf("%d.prefix_pos=%p len=%d\n", i, pos, len);
                     84: 
                     85:                        // prefix chunk
                     86:                        prefix = pos;
                     87:                        if (prefix->sc_magic != DLTSYNC_MAGIC) {
                     88:                                if (a) {
                     89:                                        free(a);
                     90:                                        a = NULL;
                     91:                                }
                     92:                                return -1;
                     93:                        } else {
                     94:                                a[i].pfx = prefix;
                     95:                                pos += sizeof(sync_chunk_t);
                     96:                                len -= sizeof(sync_chunk_t);
                     97:                        }
                     98:                        // printf("%d.prefix=%p pos=%p len=%d\n", i, a[i].pfx, pos, len);
                     99: 
                    100:                        // data
                    101:                        if (!len) {
                    102:                                if (a) {
                    103:                                        free(a);
                    104:                                        a = NULL;
                    105:                                }
                    106:                                return -1;
                    107:                        } else {
                    108:                                a[i].buf = pos;
                    109:                                pos += prefix->sc_len;
                    110:                                len -= prefix->sc_len;
                    111:                        }
                    112:                        // printf("%d.data=%p pos=%p len=%d\n", i, a[i].buf, pos, len);
                    113: 
                    114:                        // if find sync chunk
                    115:                        if (len) {
                    116:                                suffix = pos;
                    117:                                if (SIGSYNC_MAGIC == suffix->sc_magic) {
                    118:                                        a[i].sfx = suffix;
                    119:                                        pos += sizeof(sync_chunk_t);
                    120:                                        len -= sizeof(sync_chunk_t);
                    121:                                }
                    122:                                // printf("%d.data=%p pos=%p len=%d\n", i, a[i].sfx, pos, len);
                    123:                        }
                    124:                }
                    125:        }
                    126: 
                    127:        *arr = a;
                    128:        return i;
                    129: }