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
138
139
140
141
142
143
144
145
146
|
/* gunzip.c - Alpine Package Keeper (APK)
*
* Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <malloc.h>
#include <zlib.h>
#include "apk_defines.h"
#include "apk_io.h"
struct apk_gzip_istream {
struct apk_istream is;
struct apk_bstream *bs;
z_stream zs;
int z_err;
int autoclose;
EVP_MD_CTX mdctx;
void *mdblock;
apk_multipart_cb cb;
void *cbctx;
};
static size_t gz_read(void *stream, void *ptr, size_t size)
{
struct apk_gzip_istream *gis =
container_of(stream, struct apk_gzip_istream, is);
if (gis->z_err == Z_DATA_ERROR || gis->z_err == Z_ERRNO)
return -1;
if (gis->z_err == Z_STREAM_END)
return 0;
if (ptr == NULL)
return apk_istream_skip(&gis->is, size);
gis->zs.avail_out = size;
gis->zs.next_out = ptr;
while (gis->zs.avail_out != 0 && gis->z_err == Z_OK) {
if (gis->zs.avail_in == 0) {
apk_blob_t blob;
if (gis->cb != NULL && gis->mdblock != NULL) {
/* Digest the inflated bytes */
EVP_DigestUpdate(&gis->mdctx, gis->mdblock,
(void *)gis->zs.next_in - gis->mdblock);
}
blob = gis->bs->read(gis->bs, APK_BLOB_NULL);
gis->mdblock = blob.ptr;
gis->zs.avail_in = blob.len;
gis->zs.next_in = (void *) gis->mdblock;
if (gis->zs.avail_in < 0) {
gis->z_err = Z_DATA_ERROR;
return size - gis->zs.avail_out;
} else if (gis->zs.avail_in == 0) {
if (gis->cb != NULL)
gis->cb(gis->cbctx, &gis->mdctx,
APK_MPART_END);
gis->z_err = Z_STREAM_END;
return size - gis->zs.avail_out;
}
}
gis->z_err = inflate(&gis->zs, Z_NO_FLUSH);
if (gis->z_err == Z_STREAM_END) {
/* Digest the inflated bytes */
if (gis->cb != NULL) {
EVP_DigestUpdate(&gis->mdctx, gis->mdblock,
(void *)gis->zs.next_in - gis->mdblock);
gis->mdblock = gis->zs.next_in;
gis->cb(gis->cbctx, &gis->mdctx,
APK_MPART_BOUNDARY);
}
inflateEnd(&gis->zs);
if (inflateInit2(&gis->zs, 15+32) != Z_OK)
return -1;
gis->z_err = Z_OK;
}
}
if (gis->z_err != Z_OK && gis->z_err != Z_STREAM_END)
return -1;
return size - gis->zs.avail_out;
}
static void gz_close(void *stream)
{
struct apk_gzip_istream *gis =
container_of(stream, struct apk_gzip_istream, is);
if (gis->cb != NULL)
EVP_MD_CTX_cleanup(&gis->mdctx);
inflateEnd(&gis->zs);
if (gis->autoclose)
gis->bs->close(gis->bs, NULL);
free(gis);
}
struct apk_istream *apk_bstream_gunzip_mpart(struct apk_bstream *bs, int autoclose,
apk_multipart_cb cb, void *ctx)
{
struct apk_gzip_istream *gis;
if (bs == NULL)
return NULL;
gis = malloc(sizeof(struct apk_gzip_istream));
if (gis == NULL)
return NULL;
*gis = (struct apk_gzip_istream) {
.is.read = gz_read,
.is.close = gz_close,
.bs = bs,
.z_err = 0,
.autoclose = autoclose,
.cb = cb,
.cbctx = ctx,
};
if (inflateInit2(&gis->zs, 15+32) != Z_OK) {
free(gis);
return NULL;
}
if (gis->cb != NULL) {
EVP_MD_CTX_init(&gis->mdctx);
cb(ctx, &gis->mdctx, APK_MPART_BEGIN);
}
return &gis->is;
}
|
