1/* ====================================================================
2 *    Licensed to the Apache Software Foundation (ASF) under one
3 *    or more contributor license agreements.  See the NOTICE file
4 *    distributed with this work for additional information
5 *    regarding copyright ownership.  The ASF licenses this file
6 *    to you under the Apache License, Version 2.0 (the
7 *    "License"); you may not use this file except in compliance
8 *    with the License.  You may obtain a copy of the License at
9 *
10 *      http://www.apache.org/licenses/LICENSE-2.0
11 *
12 *    Unless required by applicable law or agreed to in writing,
13 *    software distributed under the License is distributed on an
14 *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 *    KIND, either express or implied.  See the License for the
16 *    specific language governing permissions and limitations
17 *    under the License.
18 * ====================================================================
19 */
20
21#include <apr_pools.h>
22#include <apr_mmap.h>
23
24#include "serf.h"
25#include "serf_bucket_util.h"
26
27#if APR_HAS_MMAP
28
29typedef struct {
30    apr_mmap_t *mmap;
31    void *current;
32    apr_off_t offset;
33    apr_off_t remaining;
34} mmap_context_t;
35
36
37serf_bucket_t *serf_bucket_mmap_create(
38    apr_mmap_t *file_mmap,
39    serf_bucket_alloc_t *allocator)
40{
41    mmap_context_t *ctx;
42
43    ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
44    ctx->mmap = file_mmap;
45    ctx->current = NULL;
46    ctx->offset = 0;
47    ctx->remaining = ctx->mmap->size;
48
49    return serf_bucket_create(&serf_bucket_type_mmap, allocator, ctx);
50}
51
52static apr_status_t serf_mmap_read(serf_bucket_t *bucket,
53                                     apr_size_t requested,
54                                     const char **data, apr_size_t *len)
55{
56    mmap_context_t *ctx = bucket->data;
57
58    if (requested == SERF_READ_ALL_AVAIL || requested > ctx->remaining) {
59        *len = ctx->remaining;
60    }
61    else {
62        *len = requested;
63    }
64
65    /* ### Would it be faster to call this once and do the offset ourselves? */
66    apr_mmap_offset((void**)data, ctx->mmap, ctx->offset);
67
68    /* For the next read... */
69    ctx->offset += *len;
70    ctx->remaining -= *len;
71
72    if (ctx->remaining == 0) {
73        return APR_EOF;
74    }
75    return APR_SUCCESS;
76}
77
78static apr_status_t serf_mmap_readline(serf_bucket_t *bucket,
79                                         int acceptable, int *found,
80                                         const char **data, apr_size_t *len)
81{
82    mmap_context_t *ctx = bucket->data;
83    const char *end;
84
85    /* ### Would it be faster to call this once and do the offset ourselves? */
86    apr_mmap_offset((void**)data, ctx->mmap, ctx->offset);
87    end = *data;
88
89    /* XXX An overflow is generated if we pass &ctx->remaining to readline.
90     * Not real clear why.
91     */
92    *len = ctx->remaining;
93
94    serf_util_readline(&end, len, acceptable, found);
95
96    *len = end - *data;
97
98    ctx->offset += *len;
99    ctx->remaining -= *len;
100
101    if (ctx->remaining == 0) {
102        return APR_EOF;
103    }
104    return APR_SUCCESS;
105}
106
107static apr_status_t serf_mmap_peek(serf_bucket_t *bucket,
108                                     const char **data,
109                                     apr_size_t *len)
110{
111    /* Oh, bah. */
112    return APR_ENOTIMPL;
113}
114
115const serf_bucket_type_t serf_bucket_type_mmap = {
116    "MMAP",
117    serf_mmap_read,
118    serf_mmap_readline,
119    serf_default_read_iovec,
120    serf_default_read_for_sendfile,
121    serf_default_read_bucket,
122    serf_mmap_peek,
123    serf_default_destroy_and_data,
124};
125
126#else /* !APR_HAS_MMAP */
127
128serf_bucket_t *serf_bucket_mmap_create(apr_mmap_t *file_mmap,
129                                       serf_bucket_alloc_t *allocator)
130{
131    return NULL;
132}
133
134const serf_bucket_type_t serf_bucket_type_mmap = {
135    "MMAP",
136    NULL,
137    NULL,
138    NULL,
139    NULL,
140    NULL,
141    NULL,
142    NULL,
143};
144
145#endif
146