1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
// SPDX-License-Identifier: LGPL-2.1
/*
* Copyright (C) 2021, VMware, Tzvetomir Stoyanov tz.stoyanov@gmail.com>
*
*/
#include <stdlib.h>
#include <dlfcn.h>
#include <zlib.h>
#include <errno.h>
#include "trace-cmd-private.h"
#define __ZLIB_NAME "zlib"
#define __ZLIB_WEIGTH 10
static int zlib_compress(void *ctx, const void *in, int in_bytes, void *out, int out_bytes)
{
unsigned long obytes = out_bytes;
int ret;
ret = compress2((unsigned char *)out, &obytes,
(unsigned char *)in, (unsigned long)in_bytes, Z_BEST_COMPRESSION);
switch (ret) {
case Z_OK:
return obytes;
case Z_BUF_ERROR:
errno = -ENOBUFS;
break;
case Z_MEM_ERROR:
errno = -ENOMEM;
break;
case Z_STREAM_ERROR:
errno = -EINVAL;
break;
case Z_ERRNO:
break;
default:
errno = -EFAULT;
break;
}
return -1;
}
static int zlib_decompress(void *ctx, const void *in, int in_bytes, void *out, int out_bytes)
{
unsigned long obytes = out_bytes;
int ret;
ret = uncompress((unsigned char *)out, &obytes,
(unsigned char *)in, (unsigned long)in_bytes);
switch (ret) {
case Z_OK:
return obytes;
case Z_BUF_ERROR:
errno = -ENOBUFS;
break;
case Z_MEM_ERROR:
errno = -ENOMEM;
break;
case Z_DATA_ERROR:
errno = -EINVAL;
break;
case Z_ERRNO:
break;
default:
errno = -EFAULT;
break;
}
return -1;
}
static unsigned int zlib_compress_bound(void *ctx, unsigned int in_bytes)
{
return compressBound(in_bytes);
}
static bool zlib_is_supported(const char *name, const char *version)
{
const char *zver;
if (!name)
return false;
if (strlen(name) != strlen(__ZLIB_NAME) || strcmp(name, __ZLIB_NAME))
return false;
if (!version)
return true;
zver = zlibVersion();
if (!zver)
return false;
/* Compare the major version number */
if (atoi(version) <= atoi(zver))
return true;
return false;
}
int tracecmd_zlib_init(void)
{
struct tracecmd_compression_proto proto;
memset(&proto, 0, sizeof(proto));
proto.name = __ZLIB_NAME;
proto.version = zlibVersion();
proto.weight = __ZLIB_WEIGTH;
proto.compress = zlib_compress;
proto.uncompress = zlib_decompress;
proto.is_supported = zlib_is_supported;
proto.compress_size = zlib_compress_bound;
return tracecmd_compress_proto_register(&proto);
}
|
