1// Aseprite Document IO Library
2// Copyright (c) 2017-2018 David Capello
3//
4// This file is released under the terms of the MIT license.
5// Read LICENSE.txt for more information.
6
7#ifndef DIO_FILE_INTERFACE_H_INCLUDED
8#define DIO_FILE_INTERFACE_H_INCLUDED
9#pragma once
10
11#include <cstddef>
12#include <cstdint>
13#include <cstdio>
14
15namespace dio {
16
17class FileInterface {
18public:
19 virtual ~FileInterface() { }
20
21 // Returns true if we can read/write bytes from/into the file
22 virtual bool ok() const = 0;
23
24 // Current position in the file
25 virtual size_t tell() = 0;
26
27 // Jump to the given position in the file
28 virtual void seek(size_t absPos) = 0;
29
30 // Returns the next byte in the file or 0 if ok() = false
31 virtual uint8_t read8() = 0;
32 virtual size_t readBytes(uint8_t* buf, size_t n) = 0;
33
34 // Writes one byte in the file (or do nothing if ok() = false)
35 virtual void write8(uint8_t value) = 0;
36
37};
38
39class StdioFileInterface : public FileInterface {
40public:
41 StdioFileInterface(FILE* file);
42 bool ok() const override;
43 size_t tell() override;
44 void seek(size_t absPos) override;
45 uint8_t read8() override;
46 size_t readBytes(uint8_t* buf, size_t n) override;
47 void write8(uint8_t value) override;
48private:
49 FILE* m_file;
50 bool m_ok;
51};
52
53} // namespace dio
54
55#endif
56