file_buckets.c revision 251877 
1/* Copyright 2002-2004 Justin Erenkrantz and Greg Stein
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 *     http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include <apr_pools.h>
17
18#include "serf.h"
19#include "serf_bucket_util.h"
20
21typedef struct {
22    apr_file_t *file;
23
24    serf_databuf_t databuf;
25
26} file_context_t;
27
28
29static apr_status_t file_reader(void *baton, apr_size_t bufsize,
30                                char *buf, apr_size_t *len)
31{
32    file_context_t *ctx = baton;
33
34    *len = bufsize;
35    return apr_file_read(ctx->file, buf, len);
36}
37
38serf_bucket_t *serf_bucket_file_create(
39    apr_file_t *file,
40    serf_bucket_alloc_t *allocator)
41{
42    file_context_t *ctx;
43#if APR_HAS_MMAP
44    apr_finfo_t finfo;
45    const char *file_path;
46
47    /* See if we'd be better off mmap'ing this file instead.
48     *
49     * Note that there is a failure case here that we purposely fall through:
50     * if a file is buffered, apr_mmap will reject it.  However, on older
51     * versions of APR, we have no way of knowing this - but apr_mmap_create
52     * will check for this and return APR_EBADF.
53     */
54    apr_file_name_get(&file_path, file);
55    apr_stat(&finfo, file_path, APR_FINFO_SIZE,
56             serf_bucket_allocator_get_pool(allocator));
57    if (APR_MMAP_CANDIDATE(finfo.size)) {
58        apr_status_t status;
59        apr_mmap_t *file_mmap;
60        status = apr_mmap_create(&file_mmap, file, 0, finfo.size,
61                                 APR_MMAP_READ,
62                                 serf_bucket_allocator_get_pool(allocator));
63
64        if (status == APR_SUCCESS) {
65            return serf_bucket_mmap_create(file_mmap, allocator);
66        }
67    }
68#endif
69
70    /* Oh, well. */
71    ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
72    ctx->file = file;
73
74    serf_databuf_init(&ctx->databuf);
75    ctx->databuf.read = file_reader;
76    ctx->databuf.read_baton = ctx;
77
78    return serf_bucket_create(&serf_bucket_type_file, allocator, ctx);
79}
80
81static apr_status_t serf_file_read(serf_bucket_t *bucket,
82                                   apr_size_t requested,
83                                   const char **data, apr_size_t *len)
84{
85    file_context_t *ctx = bucket->data;
86
87    return serf_databuf_read(&ctx->databuf, requested, data, len);
88}
89
90static apr_status_t serf_file_readline(serf_bucket_t *bucket,
91                                       int acceptable, int *found,
92                                       const char **data, apr_size_t *len)
93{
94    file_context_t *ctx = bucket->data;
95
96    return serf_databuf_readline(&ctx->databuf, acceptable, found, data, len);
97}
98
99static apr_status_t serf_file_peek(serf_bucket_t *bucket,
100                                   const char **data,
101                                   apr_size_t *len)
102{
103    file_context_t *ctx = bucket->data;
104
105    return serf_databuf_peek(&ctx->databuf, data, len);
106}
107
108const serf_bucket_type_t serf_bucket_type_file = {
109    "FILE",
110    serf_file_read,
111    serf_file_readline,
112    serf_default_read_iovec,
113    serf_default_read_for_sendfile,
114    serf_default_read_bucket,
115    serf_file_peek,
116    serf_default_destroy_and_data,
117};
118