DataSource.h revision 693d271e62a3726689ff68f4505ba49228eb94b2
120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber/* 220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * Copyright (C) 2009 The Android Open Source Project 320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * 420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * Licensed under the Apache License, Version 2.0 (the "License"); 520111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * you may not use this file except in compliance with the License. 620111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * You may obtain a copy of the License at 720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * 820111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * http://www.apache.org/licenses/LICENSE-2.0 920111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * 1020111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * Unless required by applicable law or agreed to in writing, software 1120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * distributed under the License is distributed on an "AS IS" BASIS, 1220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * See the License for the specific language governing permissions and 1420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber * limitations under the License. 1520111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber */ 1620111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 1720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#ifndef DATA_SOURCE_H_ 1820111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 1920111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#define DATA_SOURCE_H_ 2020111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 2120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#include <sys/types.h> 2220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 2320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#include <utils/Errors.h> 2420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#include <utils/List.h> 25693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber#include <utils/RefBase.h> 2620111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#include <utils/threads.h> 2720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 2820111aa043c5f404472bc63b90bc5aad906b1101Andreas Hubernamespace android { 2920111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 3020111aa043c5f404472bc63b90bc5aad906b1101Andreas Huberclass String8; 3120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 32693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huberclass DataSource : public RefBase { 3320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huberpublic: 3420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber DataSource() {} 3520111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 3620111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber virtual ssize_t read_at(off_t offset, void *data, size_t size) = 0; 3720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 38693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber // Convenience methods: 39693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber bool getUInt16(off_t offset, uint16_t *x); 40693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber 4120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber // May return ERROR_UNSUPPORTED. 4220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber virtual status_t getSize(off_t *size); 4320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 4420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber //////////////////////////////////////////////////////////////////////////// 4520111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 4620111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber bool sniff(String8 *mimeType, float *confidence); 4720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 4820111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber typedef bool (*SnifferFunc)( 49693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber const sp<DataSource> &source, String8 *mimeType, float *confidence); 5020111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 5120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber static void RegisterSniffer(SnifferFunc func); 5220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber static void RegisterDefaultSniffers(); 5320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 54693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huberprotected: 55693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber virtual ~DataSource() {} 56693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber 5720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huberprivate: 5820111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber static Mutex gSnifferMutex; 5920111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber static List<SnifferFunc> gSniffers; 6020111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 6120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber DataSource(const DataSource &); 6220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber DataSource &operator=(const DataSource &); 6320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber}; 6420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 6520111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber} // namespace android 6620111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 6720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#endif // DATA_SOURCE_H_ 68