DataSource.h revision 5561ccf4a8db88a2e44eac1b3ed13b4ff53a7f20
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> 245561ccf4a8db88a2e44eac1b3ed13b4ff53a7f20Andreas Huber#include <utils/KeyedVector.h> 2520111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#include <utils/List.h> 26693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber#include <utils/RefBase.h> 2720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#include <utils/threads.h> 2820111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 2920111aa043c5f404472bc63b90bc5aad906b1101Andreas Hubernamespace android { 3020111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 3120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huberclass String8; 3220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 33693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huberclass DataSource : public RefBase { 3420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huberpublic: 3566b0a35c9a4136a84c3f73b1b25fcb5220138b95Andreas Huber enum Flags { 3666b0a35c9a4136a84c3f73b1b25fcb5220138b95Andreas Huber kWantsPrefetching = 1, 3766b0a35c9a4136a84c3f73b1b25fcb5220138b95Andreas Huber }; 3866b0a35c9a4136a84c3f73b1b25fcb5220138b95Andreas Huber 395561ccf4a8db88a2e44eac1b3ed13b4ff53a7f20Andreas Huber static sp<DataSource> CreateFromURI( 405561ccf4a8db88a2e44eac1b3ed13b4ff53a7f20Andreas Huber const char *uri, 415561ccf4a8db88a2e44eac1b3ed13b4ff53a7f20Andreas Huber const KeyedVector<String8, String8> *headers = NULL); 42fc9ba09e3bb368f823d473f5e2bb9aa32dba6289Andreas Huber 4320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber DataSource() {} 4420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 4534769bc913e9f6bb138e666d94a9d685bf3da217Andreas Huber virtual status_t initCheck() const = 0; 4634769bc913e9f6bb138e666d94a9d685bf3da217Andreas Huber 4734769bc913e9f6bb138e666d94a9d685bf3da217Andreas Huber virtual ssize_t readAt(off_t offset, void *data, size_t size) = 0; 4820111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 49693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber // Convenience methods: 50693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber bool getUInt16(off_t offset, uint16_t *x); 51693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber 5220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber // May return ERROR_UNSUPPORTED. 5320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber virtual status_t getSize(off_t *size); 5420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 5566b0a35c9a4136a84c3f73b1b25fcb5220138b95Andreas Huber virtual uint32_t flags() { 5666b0a35c9a4136a84c3f73b1b25fcb5220138b95Andreas Huber return 0; 5766b0a35c9a4136a84c3f73b1b25fcb5220138b95Andreas Huber } 5866b0a35c9a4136a84c3f73b1b25fcb5220138b95Andreas Huber 5920111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber //////////////////////////////////////////////////////////////////////////// 6020111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 6120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber bool sniff(String8 *mimeType, float *confidence); 6220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 6320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber typedef bool (*SnifferFunc)( 64693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber const sp<DataSource> &source, String8 *mimeType, float *confidence); 6520111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 6620111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber static void RegisterSniffer(SnifferFunc func); 6720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber static void RegisterDefaultSniffers(); 6820111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 69693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huberprotected: 70693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber virtual ~DataSource() {} 71693d271e62a3726689ff68f4505ba49228eb94b2Andreas Huber 7220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huberprivate: 7320111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber static Mutex gSnifferMutex; 7420111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber static List<SnifferFunc> gSniffers; 7520111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 7620111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber DataSource(const DataSource &); 7720111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber DataSource &operator=(const DataSource &); 7820111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber}; 7920111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 8020111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber} // namespace android 8120111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber 8220111aa043c5f404472bc63b90bc5aad906b1101Andreas Huber#endif // DATA_SOURCE_H_ 83