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
72
73
74
75
76
77
78
79
80
81
82
|
/* Copyright 2024 Ján Sučan <jan@jansucan.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "exception.h"
#include <cstring>
#include <filesystem>
#include <fstream>
class BufferedFileError : public DiffddError
{
public:
explicit BufferedFileError(const std::string &message)
: DiffddError(message)
{
}
};
class BufferedFileReader
{
public:
BufferedFileReader(std::istream &istream, size_t buffer_capacity);
virtual ~BufferedFileReader() = default;
size_t read(char *data, size_t data_size);
size_t tryRead(size_t data_size, char **return_data);
private:
std::istream &m_istream;
std::unique_ptr<char[]> m_buffer;
size_t m_buffer_offset;
size_t m_buffer_size;
const size_t m_buffer_capacity;
size_t read_buffer(size_t data_size, char **return_data);
void refill_buffer();
size_t read_file(char *data, size_t data_size);
};
class BufferedFileWriter
{
public:
BufferedFileWriter(std::ostream &ostream, size_t buffer_capacity);
virtual ~BufferedFileWriter();
void write(const char *data, size_t data_size);
private:
std::ostream &m_ostream;
std::unique_ptr<char[]> m_buffer;
size_t m_buffer_size;
const size_t m_buffer_capacity;
void write_buffer(const char *data, size_t data_size);
void flush_buffer();
void write_file(const char *data, size_t data_size);
};
|
