| /* |
| * Copyright (C) 2009 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef DATA_SOURCE_H_ |
| |
| #define DATA_SOURCE_H_ |
| |
| #include <sys/types.h> |
| |
| #include <utils/Errors.h> |
| #include <utils/List.h> |
| #include <utils/RefBase.h> |
| #include <utils/threads.h> |
| |
| namespace android { |
| |
| class String8; |
| |
| class DataSource : public RefBase { |
| public: |
| DataSource() {} |
| |
| virtual ssize_t read_at(off_t offset, void *data, size_t size) = 0; |
| |
| // Convenience methods: |
| bool getUInt16(off_t offset, uint16_t *x); |
| |
| // May return ERROR_UNSUPPORTED. |
| virtual status_t getSize(off_t *size); |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| bool sniff(String8 *mimeType, float *confidence); |
| |
| typedef bool (*SnifferFunc)( |
| const sp<DataSource> &source, String8 *mimeType, float *confidence); |
| |
| static void RegisterSniffer(SnifferFunc func); |
| static void RegisterDefaultSniffers(); |
| |
| protected: |
| virtual ~DataSource() {} |
| |
| private: |
| static Mutex gSnifferMutex; |
| static List<SnifferFunc> gSniffers; |
| |
| DataSource(const DataSource &); |
| DataSource &operator=(const DataSource &); |
| }; |
| |
| } // namespace android |
| |
| #endif // DATA_SOURCE_H_ |