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
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
#ifdef WIN32
#include <windows.h>
#endif
#include <sys/types.h>
#include <sys/mman.h>
#include "util.h"
using namespace std;
string gettempfolder()
{
#ifdef _WIN32
char *tmpPath = getenv("TMP");
string str(tmpPath);
if (str.substr(str.size() - 1, 1) != "\\")
str += "\\";
return str;
#else
return "/tmp/";
#endif
}
void createtempfile(ofstream &fileStream, string &filePath, std::ios_base::openmode flags)
{
#ifdef _WIN32
char buffer[BUFSIZ];
::GetTempFileNameA(gettempfolder().c_str(), "", 0, buffer);
filePath = buffer;
#else
char buffer[L_tmpnam];
strcpy(buffer, gettempfolder().c_str());
strcat(buffer, "dskbuff--XXXXXX");
mkstemp(buffer);
filePath = buffer;
#endif
fileStream.open(filePath.c_str(), flags);
}
void removefile(const std::string &filePath)
{
#ifdef _WIN32
::DeleteFileA(filePath.c_str());
#else
char cmd[100];
sprintf(cmd,"rm %s",filePath.c_str());
system(cmd);
#endif
}
inputfilestream::inputfilestream(const std::string &filePath)
: std::istream(0),
m_streambuf(0)
{
if (filePath.size() > 3 &&
filePath.substr(filePath.size() - 3, 3) == ".gz")
{
m_streambuf = new gzfilebuf(filePath.c_str());
} else {
std::filebuf* fb = new std::filebuf();
fb->open(filePath.c_str(), std::ios::in);
m_streambuf = fb;
}
this->init(m_streambuf);
}
inputfilestream::~inputfilestream()
{
delete m_streambuf; m_streambuf = 0;
}
void inputfilestream::close()
{
}
//MemoryMap Management
//Code kindly provided by Fabio Brugnara, ITC-irst Trento.
/* How to use it:
call MMap with offset and required size (psgz):
pg->b = MMap(fd, rdwr,offset,pgsz,&g);
correct returned pointer with the alignment gap and save the gap:
pg->b += pg->gap = g;
when releasing mapped memory, subtract the gap from the pointer and add
the gap to the requested dimension
Munmap(pg->b-pg->gap, pgsz+pg->gap, 0);
*/
void *MMap(int fd, int access, off_t offset, size_t len, off_t *gap)
{
void *p;
int pgsz,g=0;
#if defined(_WIN32)
HANDLE fh,
mh;
fh = (HANDLE)_get_osfhandle(fd)
if(offset) {
/* bisogna accertarsi che l'offset abbia la granularita`
* corretta, MAI PROVATA! */
SYSTEM_INFO si;
GetSystemInfo(&si);
g = *gap = offset%si.dwPageSize;
} else if(gap) {
*gap=0;
}
if(!(mh=CreateFileMapping(fh, NULL, PAGE_READWRITE, 0, len+g, NULL))) {
return 0;
}
p = (char*)MapViewOfFile(mh, FILE_MAP_ALL_ACCESS, 0,
offset-*gap, len+*gap);
CloseHandle(mh);
#else
if(offset) {
pgsz = sysconf(_SC_PAGESIZE);
g = *gap = offset%pgsz;
} else if(gap) {
*gap=0;
}
p = mmap((void*)0, len+g, access,
MAP_SHARED|MAP_FILE,
fd, offset-g);
if((long)p==-1L) {
perror("mmap failed");
p=0;
}
#endif
return p;
}
int Munmap(void *p,size_t len,int sync)
{
int r=0;
#if defined(_WIN32)
if(sync) FlushViewOfFile(p, len);
UnmapViewOfFile(p);
#else
if(sync) msync(p, len, MS_SYNC);
if((r=munmap((void*)p, len))) perror("munmap() failed");
#endif
return r;
}
|
