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// Copyright 2009 Google Inc. All Rights Reserved.
#ifndef ART_SRC_FILE_H_
#define ART_SRC_FILE_H_
#include <stdint.h>
#include <sys/types.h>
namespace art {
class File {
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_; }
explicit File(const char* name) : name_(name) { }
virtual void Close() = 0;
virtual bool IsClosed() = 0;
const char* name_;
} // namespace art
#endif // ART_SRC_FILE_H_