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
29 typedef 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
serf_bucket_mmap_create(apr_mmap_t * file_mmap,serf_bucket_alloc_t * allocator)37 serf_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
serf_mmap_read(serf_bucket_t * bucket,apr_size_t requested,const char ** data,apr_size_t * len)52 static 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
serf_mmap_readline(serf_bucket_t * bucket,int acceptable,int * found,const char ** data,apr_size_t * len)78 static 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
serf_mmap_peek(serf_bucket_t * bucket,const char ** data,apr_size_t * len)107 static 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
115 const 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
serf_bucket_mmap_create(apr_mmap_t * file_mmap,serf_bucket_alloc_t * allocator)128 serf_bucket_t *serf_bucket_mmap_create(apr_mmap_t *file_mmap,
129 serf_bucket_alloc_t *allocator)
130 {
131 return NULL;
132 }
133
134 const 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