summaryrefslogtreecommitdiffstats
path: root/src/core/file_sys/file_backend.h
blob: df7165df36c6dc6771f5379abfa030fd7c89cd51 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <cstddef>

#include "common/common_types.h"

////////////////////////////////////////////////////////////////////////////////////////////////////
// FileSys namespace

namespace FileSys {

class FileBackend : NonCopyable {
public:
    FileBackend() { }
    virtual ~FileBackend() { }

    /**
     * Open the file
     * @return true if the file opened correctly
     */
    virtual bool Open() = 0;

    /**
     * Read data from the file
     * @param offset Offset in bytes to start reading data from
     * @param length Length in bytes of data to read from file
     * @param buffer Buffer to read data into
     * @return Number of bytes read
     */
    virtual size_t Read(u64 offset, size_t length, u8* buffer) const = 0;

    /**
     * Write data to the file
     * @param offset Offset in bytes to start writing data to
     * @param length Length in bytes of data to write to file
     * @param flush The flush parameters (0 == do not flush)
     * @param buffer Buffer to read data from
     * @return Number of bytes written
     */
    virtual size_t Write(u64 offset, size_t length, bool flush, const u8* buffer) const = 0;

    /**
     * Get the size of the file in bytes
     * @return Size of the file in bytes
     */
    virtual u64 GetSize() const = 0;

    /**
     * Set the size of the file in bytes
     * @param size New size of the file
     * @return true if successful
     */
    virtual bool SetSize(u64 size) const = 0;

    /**
     * Close the file
     * @return true if the file closed correctly
     */
    virtual bool Close() const = 0;

    /**
     * Flushes the file
     */
    virtual void Flush() const = 0;
};

} // namespace FileSys