1 /*
2  * Copyright (C) 2013 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include "Registry.h"
18 
19 #include "Stream.h"
20 
21 static Registry* gHead = 0;
22 static int gHeaderBytesRequired = 0;
23 
Registry(const RegistryEntry & entry)24 Registry::Registry(const RegistryEntry& entry) {
25     mImpl = entry;
26 
27     mNext = gHead;
28     gHead = this;
29 
30     if (gHeaderBytesRequired < entry.requiredHeaderBytes) {
31         gHeaderBytesRequired = entry.requiredHeaderBytes;
32     }
33 }
34 
Find(Stream * stream)35 const RegistryEntry* Registry::Find(Stream* stream) {
36     Registry* registry = gHead;
37 
38     if (stream->getRawBuffer() != NULL) {
39         while (registry) {
40             if (registry->mImpl.acceptsBuffer()) {
41                 return &(registry->mImpl);
42             }
43             registry = registry->mNext;
44         }
45     } else {
46         int headerSize = gHeaderBytesRequired;
47         char header[headerSize];
48         headerSize = stream->peek(header, headerSize);
49         while (registry) {
50             if (headerSize >= registry->mImpl.requiredHeaderBytes
51                     && registry->mImpl.checkHeader(header, headerSize)) {
52                 return &(registry->mImpl);
53             }
54             registry = registry->mNext;
55         }
56     }
57     return 0;
58 }
59 
60