blob: 64a76001c9bffd039b61ac766fc44e12fa7fc5f2 (
plain)
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
|
#pragma once
#include "Types.hpp"
#include <fstream>
#include <iostream>
#include <string>
#define BUFFER_SIZE (1024 * 1024 / 2)
namespace pgnp {
using namespace std;
class LargeFileStream {
/// @brief File to load
ifstream file;
/// @brief In memory buffer
char buffer[BUFFER_SIZE];
/// @brief Number of chuck read minus 1
ull chuck_count;
/// @brief Number of byte read during the last file access
ull last_read_size;
/// @brief Keep track of the file offset (to prevent backward read)
ull last_loc;
/// @brief Use a string as file content
std::string content;
/// @brief Use to shortcut some methods
bool use_string;
/// @brief End Of File ?
bool eof;
/// @brief Load the next chuck of data from disk to memory
void ReadNextChunk();
public:
LargeFileStream();
void FromFile(std::string filepath);
/// @brief Emulate file access with a string
void FromString(std::string content);
/// @brief Allow array like access to the file
char operator[](ull loc);
/// @brief Check if we reach the EOF
bool IsEOF();
// Various Exceptions
struct BackwardRead : public std::exception {
const char *what() const throw() {
return "LargeFileStream cannot read backward";
}
};
struct ReadToFar : public std::exception {
const char *what() const throw() { return "You reach the end of the file"; }
};
};
} // namespace pgnp
|
