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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
/*
* Copyright (c) 2016 DeNA Co., Ltd., Kazuho Oku
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <assert.h>
#include <stdlib.h>
#include <zlib.h>
#include "h2o.h"
#define WINDOW_BITS 31
#ifndef BUF_SIZE /* is altered by unit test */
#define BUF_SIZE 8192
#endif
typedef H2O_VECTOR(h2o_iovec_t) iovec_vector_t;
struct st_gzip_context_t {
h2o_compress_context_t super;
z_stream zs;
int zs_is_open;
iovec_vector_t bufs;
};
static void do_compress(h2o_compress_context_t *_self, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state,
h2o_iovec_t **outbufs, size_t *outbufcnt);
static void do_decompress(h2o_compress_context_t *_self, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state,
h2o_iovec_t **outbufs, size_t *outbufcnt);
static void *alloc_cb(void *_unused, unsigned int cnt, unsigned int sz)
{
return h2o_mem_alloc(cnt * (size_t)sz);
}
static void free_cb(void *_unused, void *p)
{
free(p);
}
static void expand_buf(iovec_vector_t *bufs)
{
h2o_vector_reserve(NULL, bufs, bufs->size + 1);
bufs->entries[bufs->size++] = h2o_iovec_init(h2o_mem_alloc(BUF_SIZE), 0);
}
typedef int (*processor)(z_streamp strm, int flush);
static size_t process_chunk(struct st_gzip_context_t *self, const void *src, size_t len, int flush, size_t bufindex, processor proc)
{
int ret;
self->zs.next_in = (void *)src;
self->zs.avail_in = (unsigned)len;
/* man says: If inflate/deflate returns with avail_out == 0, this function must be called again with the same value of the flush
* parameter and more output space (updated avail_out), until the flush is complete (function returns with non-zero avail_out).
*/
do {
/* expand buffer (note: in case of Z_SYNC_FLUSH we need to supply at least 6 bytes of output buffer) */
if (self->bufs.entries[bufindex].len + 32 > BUF_SIZE) {
++bufindex;
if (bufindex == self->bufs.size)
expand_buf(&self->bufs);
self->bufs.entries[bufindex].len = 0;
}
self->zs.next_out = (void *)(self->bufs.entries[bufindex].base + self->bufs.entries[bufindex].len);
self->zs.avail_out = (unsigned)(BUF_SIZE - self->bufs.entries[bufindex].len);
ret = proc(&self->zs, flush);
/* inflate() returns Z_BUF_ERROR if flush is set to Z_FINISH at the middle of the compressed data */
assert(ret == Z_OK || ret == Z_STREAM_END || ret == Z_BUF_ERROR);
self->bufs.entries[bufindex].len = BUF_SIZE - self->zs.avail_out;
} while (self->zs.avail_out == 0 && ret != Z_STREAM_END);
return bufindex;
}
static void do_process(h2o_compress_context_t *_self, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state,
h2o_iovec_t **outbufs, size_t *outbufcnt, processor proc)
{
struct st_gzip_context_t *self = (void *)_self;
size_t outbufindex;
h2o_iovec_t last_buf;
outbufindex = 0;
self->bufs.entries[0].len = 0;
if (inbufcnt != 0) {
size_t i;
for (i = 0; i != inbufcnt - 1; ++i)
outbufindex = process_chunk(self, inbufs[i].base, inbufs[i].len, Z_NO_FLUSH, outbufindex, proc);
last_buf = inbufs[i];
} else {
last_buf = h2o_iovec_init(NULL, 0);
}
outbufindex = process_chunk(self, last_buf.base, last_buf.len, h2o_send_state_is_in_progress(state) ? Z_SYNC_FLUSH : Z_FINISH,
outbufindex, proc);
*outbufs = self->bufs.entries;
*outbufcnt = outbufindex + 1;
if (!h2o_send_state_is_in_progress(state)) {
if (self->super.transform == do_compress) {
deflateEnd(&self->zs);
} else {
inflateEnd(&self->zs);
}
self->zs_is_open = 0;
}
}
static void do_compress(h2o_compress_context_t *_self, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state,
h2o_iovec_t **outbufs, size_t *outbufcnt)
{
do_process(_self, inbufs, inbufcnt, state, outbufs, outbufcnt, (processor)deflate);
}
static void do_decompress(h2o_compress_context_t *_self, h2o_iovec_t *inbufs, size_t inbufcnt, h2o_send_state_t state,
h2o_iovec_t **outbufs, size_t *outbufcnt)
{
do_process(_self, inbufs, inbufcnt, state, outbufs, outbufcnt, (processor)inflate);
}
static void do_free(void *_self)
{
struct st_gzip_context_t *self = _self;
size_t i;
if (self->zs_is_open) {
if (self->super.transform == do_compress) {
deflateEnd(&self->zs);
} else {
inflateEnd(&self->zs);
}
}
for (i = 0; i != self->bufs.size; ++i)
free(self->bufs.entries[i].base);
free(self->bufs.entries);
}
static struct st_gzip_context_t *gzip_open(h2o_mem_pool_t *pool)
{
struct st_gzip_context_t *self = h2o_mem_alloc_shared(pool, sizeof(*self), do_free);
self->super.name = h2o_iovec_init(H2O_STRLIT("gzip"));
self->super.transform = NULL;
self->zs.zalloc = alloc_cb;
self->zs.zfree = free_cb;
self->zs.opaque = NULL;
self->zs_is_open = 1;
self->bufs = (iovec_vector_t){NULL};
expand_buf(&self->bufs);
return self;
}
h2o_compress_context_t *h2o_compress_gzip_open(h2o_mem_pool_t *pool, int quality)
{
struct st_gzip_context_t *self = gzip_open(pool);
self->super.transform = do_compress;
/* Z_BEST_SPEED for on-the-fly compression, memlevel set to 8 as suggested by the manual */
deflateInit2(&self->zs, quality, Z_DEFLATED, WINDOW_BITS, 8, Z_DEFAULT_STRATEGY);
return &self->super;
}
h2o_compress_context_t *h2o_compress_gunzip_open(h2o_mem_pool_t *pool)
{
struct st_gzip_context_t *self = gzip_open(pool);
self->super.transform = do_decompress;
inflateInit2(&self->zs, WINDOW_BITS);
return &self->super;
}
|
