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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 ART_SRC_FILE_H_
#define ART_SRC_FILE_H_
#include <stdint.h>
#include <sys/types.h>
namespace art {
class File {
public:
virtual ~File() { }
virtual int64_t Read(void* buffer, int64_t num_bytes) = 0;
virtual int64_t Write(const void* buffer, int64_t num_bytes) = 0;
// ReadFully and WriteFully do attempt to transfer all of the bytes to/from
// the buffer. In the event of short accesses they will loop internally until
// the whole buffer has been transferred or an error occurs. If an error
// occurred the result will be set to false.
virtual bool ReadFully(void* buffer, int64_t num_bytes);
virtual bool WriteFully(const void* buffer, int64_t num_bytes);
bool WriteByte(uint8_t byte) {
return WriteFully(&byte, 1);
}
// Get the length of the file. Returns a negative value if the length cannot
// be determined (e.g. not seekable device).
virtual off_t Length() = 0;
// Get the current position in the file.
// Returns a negative value if position cannot be determined.
virtual off_t Position() = 0;
virtual int Fd() = 0;
const char* name() const { return name_; }
protected:
explicit File(const char* name) : name_(name) { }
virtual void Close() = 0;
virtual bool IsClosed() = 0;
private:
const char* name_;
};
} // namespace art
#endif // ART_SRC_FILE_H_
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