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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/* compress-debug.c - compress debug sections
Copyright (C) 2010-2023 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "config.h"
#include <stdio.h>
#include <string.h>
#include <zlib.h>
#if HAVE_ZSTD
#include <zstd.h>
#endif
#include "ansidecl.h"
#include "compress-debug.h"
/* Initialize the compression engine. */
void *
compress_init (bool use_zstd)
{
if (use_zstd) {
#if HAVE_ZSTD
return ZSTD_createCCtx ();
#endif
}
static struct z_stream_s strm;
memset (&strm, 0, sizeof (strm));
deflateInit (&strm, Z_DEFAULT_COMPRESSION);
return &strm;
}
/* Stream the contents of a frag to the compression engine. Output
from the engine goes into the current frag on the obstack. */
int
compress_data (bool use_zstd, void *ctx, const char **next_in, int *avail_in,
char **next_out, int *avail_out)
{
if (use_zstd)
{
#if HAVE_ZSTD
ZSTD_outBuffer ob = { *next_out, *avail_out, 0 };
ZSTD_inBuffer ib = { *next_in, *avail_in, 0 };
size_t ret = ZSTD_compressStream2 (ctx, &ob, &ib, ZSTD_e_continue);
*next_in += ib.pos;
*avail_in -= ib.pos;
*next_out += ob.pos;
*avail_out -= ob.pos;
if (ZSTD_isError (ret))
return -1;
return (int)ob.pos;
#endif
}
struct z_stream_s *strm = ctx;
strm->next_in = (Bytef *) (*next_in);
strm->avail_in = *avail_in;
strm->next_out = (Bytef *) (*next_out);
strm->avail_out = *avail_out;
int x = deflate (strm, Z_NO_FLUSH);
if (x != Z_OK)
return -1;
int out_size = *avail_out - strm->avail_out;
*next_in = (char *) (strm->next_in);
*avail_in = strm->avail_in;
*next_out = (char *) (strm->next_out);
*avail_out = strm->avail_out;
return out_size;
}
/* Finish the compression and consume the remaining compressed output.
Returns -1 for error, 0 when done, 1 when more output buffer is
needed. */
int
compress_finish (bool use_zstd, void *ctx, char **next_out,
int *avail_out, int *out_size)
{
if (use_zstd)
{
#if HAVE_ZSTD
ZSTD_outBuffer ob = { *next_out, *avail_out, 0 };
ZSTD_inBuffer ib = { 0, 0, 0 };
size_t ret = ZSTD_compressStream2 (ctx, &ob, &ib, ZSTD_e_end);
*out_size = ob.pos;
*next_out += ob.pos;
*avail_out -= ob.pos;
if (ZSTD_isError (ret))
return -1;
if (ret == 0)
ZSTD_freeCCtx (ctx);
return ret ? 1 : 0;
#endif
}
int x;
struct z_stream_s *strm = ctx;
strm->avail_in = 0;
strm->next_out = (Bytef *) (*next_out);
strm->avail_out = *avail_out;
x = deflate (strm, Z_FINISH);
*out_size = *avail_out - strm->avail_out;
*next_out = (char *) (strm->next_out);
*avail_out = strm->avail_out;
if (x == Z_STREAM_END)
{
deflateEnd (strm);
return 0;
}
if (strm->avail_out != 0)
return -1;
return 1;
}
|
