source: libwandio/iow-bzip.c @ 6b98325

4.0.1-hotfixescachetimestampsdevelopdpdk-ndagetsilivegetfragoffhelplibtrace4ndag_formatpfringrc-4.0.1rc-4.0.2rc-4.0.3rc-4.0.4ringdecrementfixringperformanceringtimestampfixes
Last change on this file since 6b98325 was 60f3c4c, checked in by Shane Alcock <salcock@…>, 10 years ago
  • Shifted wandio into a separate library, seeing as we're going to be exporting the API now
  • Property mode set to 100644
File size: 4.0 KB
Line 
1/*
2 * This file is part of libtrace
3 *
4 * Copyright (c) 2007,2008,2009,2010 The University of Waikato, Hamilton,
5 * New Zealand.
6 *
7 * Authors: Daniel Lawson
8 *          Perry Lorier
9 *          Shane Alcock
10 *         
11 * All rights reserved.
12 *
13 * This code has been developed by the University of Waikato WAND
14 * research group. For further information please see http://www.wand.net.nz/
15 *
16 * libtrace is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2 of the License, or
19 * (at your option) any later version.
20 *
21 * libtrace is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with libtrace; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
29 *
30 * $Id$
31 *
32 */
33
34#include "wandio.h"
35#include <bzlib.h>
36#include <sys/types.h>
37#include <sys/stat.h>
38#include <fcntl.h>
39#include <stdlib.h>
40#include <string.h>
41
42/* Libtrace IO module implement a bzip writer */
43
44enum err_t {
45        ERR_OK  = 1,
46        ERR_EOF = 0,
47        ERR_ERROR = -1
48};
49
50struct bzw_t {
51        bz_stream strm;
52        char outbuff[1024*1024];
53        int inoffset;
54        iow_t *child;
55        enum err_t err;
56};
57
58
59extern iow_source_t bz_wsource; 
60
61#define DATA(iow) ((struct bzw_t *)((iow)->data))
62#define min(a,b) ((a)<(b) ? (a) : (b))
63
64iow_t *bz_wopen(iow_t *child, int compress_level)
65{
66        iow_t *iow;
67        if (!child)
68                return NULL;
69        iow = malloc(sizeof(iow_t));
70        iow->source = &bz_wsource;
71        iow->data = malloc(sizeof(struct bzw_t));
72
73        DATA(iow)->child = child;
74
75        DATA(iow)->strm.next_in = NULL;
76        DATA(iow)->strm.avail_in = 0;
77        DATA(iow)->strm.next_out = DATA(iow)->outbuff;
78        DATA(iow)->strm.avail_out = sizeof(DATA(iow)->outbuff);
79        DATA(iow)->strm.bzalloc = NULL;
80        DATA(iow)->strm.bzfree = NULL;
81        DATA(iow)->strm.opaque = NULL;
82        DATA(iow)->err = ERR_OK;
83
84        BZ2_bzCompressInit(&DATA(iow)->strm, 
85                        compress_level, /* Block size */
86                        0,              /* Verbosity */
87                        30);            /* Work factor */
88
89        return iow;
90}
91
92
93static off_t bz_wwrite(iow_t *iow, const char *buffer, off_t len)
94{
95        if (DATA(iow)->err == ERR_EOF) {
96                return 0; /* EOF */
97        }
98        if (DATA(iow)->err == ERR_ERROR) {
99                return -1; /* ERROR! */
100        }
101
102        DATA(iow)->strm.next_in = (char*)buffer;
103        DATA(iow)->strm.avail_in = len;
104
105        while (DATA(iow)->err == ERR_OK && DATA(iow)->strm.avail_in > 0) {
106                while (DATA(iow)->strm.avail_out <= 0) {
107                        int bytes_written = wandio_wwrite(DATA(iow)->child, 
108                                DATA(iow)->outbuff,
109                                sizeof(DATA(iow)->outbuff));
110                        if (bytes_written <= 0) { /* Error */
111                                DATA(iow)->err = ERR_ERROR;
112                                /* Return how much data we managed to write ok */
113                                if (DATA(iow)->strm.avail_in != (uint32_t)len) {
114                                        return len-DATA(iow)->strm.avail_in;
115                                }
116                                /* Now return error */
117                                return -1;
118                        }
119                        DATA(iow)->strm.next_out = DATA(iow)->outbuff;
120                        DATA(iow)->strm.avail_out = sizeof(DATA(iow)->outbuff);
121                }
122                /* Decompress some data into the output buffer */
123                int err=BZ2_bzCompress(&DATA(iow)->strm, 0);
124                switch(err) {
125                        case BZ_RUN_OK:
126                        case BZ_OK:
127                                DATA(iow)->err = ERR_OK;
128                                break;
129                        default:
130                                DATA(iow)->err = ERR_ERROR;
131                                break;
132                }
133        }
134        /* Return the number of bytes compressed */
135        return len-DATA(iow)->strm.avail_in;
136}
137
138static void bz_wclose(iow_t *iow)
139{
140        while (BZ2_bzCompress(&DATA(iow)->strm, BZ_FINISH) == BZ_OK) {
141                /* Need to flush the output buffer */
142                wandio_wwrite(DATA(iow)->child, 
143                                DATA(iow)->outbuff,
144                                sizeof(DATA(iow)->outbuff)-DATA(iow)->strm.avail_out);
145                DATA(iow)->strm.next_out = DATA(iow)->outbuff;
146                DATA(iow)->strm.avail_out = sizeof(DATA(iow)->outbuff);
147        }
148        BZ2_bzCompressEnd(&DATA(iow)->strm);
149        wandio_wwrite(DATA(iow)->child, 
150                        DATA(iow)->outbuff,
151                        sizeof(DATA(iow)->outbuff)-DATA(iow)->strm.avail_out);
152        wandio_wdestroy(DATA(iow)->child);
153        free(iow->data);
154        free(iow);
155}
156
157iow_source_t bz_wsource = {
158        "bzw",
159        bz_wwrite,
160        bz_wclose
161};
162
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