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/*
* 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_
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