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
|
#include "memory_mapped_file.hpp"
#ifndef OMIM_OS_WINDOWS
#include <sys/mman.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/fcntl.h>
#include <unistd.h>
#endif
MemoryMappedFile::MemoryMappedFile(char const * fileName, bool isReadOnly)
: m_isReadOnly(isReadOnly)
{
#ifdef OMIM_OS_WINDOWS
m_fp = fopen(fileName, isReadOnly ? "r" : "w");
fseek(m_fp, 0, SEEK_END);
m_size = ftell(m_fp);
fseek(m_fp, 0, SEEK_SET);
m_data = reinterpret_cast<void *>(new char[m_size]);
fread(m_data, 1, m_size, m_fp);
#else
struct stat s;
stat(fileName, &s);
m_size = s.st_size;
m_fd = open(fileName, isReadOnly ? O_RDONLY : O_RDWR);
m_data = mmap(0, m_size, isReadOnly ? PROT_READ : (PROT_READ | PROT_WRITE), MAP_SHARED, m_fd, 0);
#endif
}
MemoryMappedFile::~MemoryMappedFile()
{
#ifdef OMIM_OS_WINDOWS
if (!m_isReadOnly)
{
fwrite(m_data, 1, m_size, m_fp);
}
fclose(m_fp);
delete[] reinterpret_cast<char *>(m_data);
#else
munmap(m_data, m_size);
close(m_fd);
#endif
}
void * MemoryMappedFile::data()
{
return m_data;
}
size_t MemoryMappedFile::size() const
{
return m_size;
}
|
