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
23 #include "serf.h"
24 #include "serf_bucket_util.h"
25 #include "serf_private.h"
26
27 typedef struct {
28 serf_bucket_t *stream;
29 apr_uint64_t remaining;
30 } limit_context_t;
31
32
serf_bucket_limit_create(serf_bucket_t * stream,apr_uint64_t len,serf_bucket_alloc_t * allocator)33 serf_bucket_t *serf_bucket_limit_create(
34 serf_bucket_t *stream, apr_uint64_t len, serf_bucket_alloc_t *allocator)
35 {
36 limit_context_t *ctx;
37
38 ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
39 ctx->stream = stream;
40 ctx->remaining = len;
41
42 return serf_bucket_create(&serf_bucket_type_limit, allocator, ctx);
43 }
44
serf_limit_read(serf_bucket_t * bucket,apr_size_t requested,const char ** data,apr_size_t * len)45 static apr_status_t serf_limit_read(serf_bucket_t *bucket,
46 apr_size_t requested,
47 const char **data, apr_size_t *len)
48 {
49 limit_context_t *ctx = bucket->data;
50 apr_status_t status;
51
52 if (!ctx->remaining) {
53 *len = 0;
54 return APR_EOF;
55 }
56
57 if (requested == SERF_READ_ALL_AVAIL || requested > ctx->remaining) {
58 if (ctx->remaining <= REQUESTED_MAX) {
59 requested = (apr_size_t) ctx->remaining;
60 } else {
61 requested = REQUESTED_MAX;
62 }
63 }
64
65 status = serf_bucket_read(ctx->stream, requested, data, len);
66
67 if (!SERF_BUCKET_READ_ERROR(status)) {
68 ctx->remaining -= *len;
69 }
70
71 /* If we have met our limit and don't have a status, return EOF. */
72 if (!ctx->remaining && !status) {
73 status = APR_EOF;
74 }
75
76 return status;
77 }
78
serf_limit_readline(serf_bucket_t * bucket,int acceptable,int * found,const char ** data,apr_size_t * len)79 static apr_status_t serf_limit_readline(serf_bucket_t *bucket,
80 int acceptable, int *found,
81 const char **data, apr_size_t *len)
82 {
83 limit_context_t *ctx = bucket->data;
84 apr_status_t status;
85
86 if (!ctx->remaining) {
87 *len = 0;
88 return APR_EOF;
89 }
90
91 status = serf_bucket_readline(ctx->stream, acceptable, found, data, len);
92
93 if (!SERF_BUCKET_READ_ERROR(status)) {
94 ctx->remaining -= *len;
95 }
96
97 /* If we have met our limit and don't have a status, return EOF. */
98 if (!ctx->remaining && !status) {
99 status = APR_EOF;
100 }
101
102 return status;
103 }
104
serf_limit_peek(serf_bucket_t * bucket,const char ** data,apr_size_t * len)105 static apr_status_t serf_limit_peek(serf_bucket_t *bucket,
106 const char **data,
107 apr_size_t *len)
108 {
109 limit_context_t *ctx = bucket->data;
110
111 return serf_bucket_peek(ctx->stream, data, len);
112 }
113
serf_limit_destroy(serf_bucket_t * bucket)114 static void serf_limit_destroy(serf_bucket_t *bucket)
115 {
116 limit_context_t *ctx = bucket->data;
117
118 serf_bucket_destroy(ctx->stream);
119
120 serf_default_destroy_and_data(bucket);
121 }
122
123 const serf_bucket_type_t serf_bucket_type_limit = {
124 "LIMIT",
125 serf_limit_read,
126 serf_limit_readline,
127 serf_default_read_iovec,
128 serf_default_read_for_sendfile,
129 serf_default_read_bucket,
130 serf_limit_peek,
131 serf_limit_destroy,
132 };
133