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
|
/*
* Copyright (C) 2023 Patrick McDermott
*
* This file is part of opkg-opkg.
*
* opkg-opkg 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 of the License, or
* (at your option) any later version.
*
* opkg-opkg 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 opkg-opkg. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <zlib.h>
#include "defs.h"
#include "gzip.h"
static int
_opkg_opk_gzip_init(struct opkg_opk_gzip_state *state)
{
state->stream.zalloc = Z_NULL;
state->stream.zfree = Z_NULL;
state->stream.opaque = Z_NULL;
if (inflateInit(&state->stream) != Z_OK) {
return OPKG_OPK_ERROR;
}
return OPKG_OPK_OK;
}
int
opkg_opk_gzip_init_from_file(struct opkg_opk_gzip_state *state,
const char *file_name)
{
state->input_file = fopen(file_name, "rb");
if (state->input_file == NULL) {
return OPKG_OPK_ERROR;
}
state->stream.next_in = Z_NULL;
state->stream.avail_in = 0;
if (_opkg_opk_gzip_init(state) < OPKG_OPK_OK) {
fclose(state->input_file);
return OPKG_OPK_ERROR;
}
return OPKG_OPK_OK;
}
int
opkg_opk_gzip_init_from_memory(struct opkg_opk_gzip_state *state,
unsigned char *input, size_t input_size)
{
state->input_file = NULL;
state->stream.next_in = input;
state->stream.avail_in = input_size;
return _opkg_opk_gzip_init(state);
}
static int
_opkg_opk_gzip_next_record_from_file(struct opkg_opk_gzip_state *state)
{
for (;;) {
if (feof(state->input_file)) {
fclose(state->input_file);
state->input_file = NULL;
inflateEnd(&state->stream);
return OPKG_OPK_OK;
}
if (state->stream.avail_in == 0) {
state->stream.avail_in = fread(state->input_buffer,
1, OPKG_OPK_GZIP_BUFFER_SIZE,
state->input_file);
if (ferror(state->input_file)) {
fclose(state->input_file);
state->input_file = NULL;
inflateEnd(&state->stream);
return OPKG_OPK_ERROR;
}
state->stream.next_in = state->input_buffer;
}
if (state->stream.avail_out == 0) {
return OPKG_OPK_OK;
}
switch (inflate(&state->stream, Z_SYNC_FLUSH)) {
case Z_OK:
case Z_STREAM_END:
case Z_BUF_ERROR:
break;
default:
fclose(state->input_file);
state->input_file = NULL;
inflateEnd(&state->stream);
return OPKG_OPK_ERROR;
}
}
}
static int
_opkg_opk_gzip_next_record_from_memory(struct opkg_opk_gzip_state *state)
{
switch (inflate(&state->stream, Z_SYNC_FLUSH)) {
case Z_OK:
return OPKG_OPK_OK;
case Z_STREAM_END:
return OPKG_OPK_END;
default:
inflateEnd(&state->stream);
return OPKG_OPK_ERROR;
}
}
int
opkg_opk_gzip_next_record(struct opkg_opk_gzip_state *state, void *record)
{
state->stream.next_out = record;
state->stream.avail_out = 512;
if (state->input_file != NULL) {
return _opkg_opk_gzip_next_record_from_file(state);
} else {
return _opkg_opk_gzip_next_record_from_memory(state);
}
}
|
