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
|
#include "SkMMapStream.h"
#include <unistd.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <errno.h>
SkMMAPStream::SkMMAPStream(const char filename[])
{
fFildes = -1; // initialize to failure case
int fildes = open(filename, O_RDONLY);
if (fildes < 0)
{
SkDEBUGF(("---- failed to open(%s) for mmap stream error=%d\n", filename, errno));
return;
}
off_t offset = lseek(fildes, 0, SEEK_END); // find the file size
if (offset == -1)
{
SkDEBUGF(("---- failed to lseek(%s) for mmap stream error=%d\n", filename, errno));
close(fildes);
return;
}
(void)lseek(fildes, 0, SEEK_SET); // restore file offset to beginning
// to avoid a 64bit->32bit warning, I explicitly create a size_t size
size_t size = static_cast<size_t>(offset);
void* addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fildes, 0);
if (MAP_FAILED == addr)
{
SkDEBUGF(("---- failed to mmap(%s) for mmap stream error=%d\n", filename, errno));
close(fildes);
return;
}
this->INHERITED::setMemory(addr, size);
fFildes = fildes;
fAddr = addr;
fSize = size;
}
SkMMAPStream::~SkMMAPStream()
{
this->closeMMap();
}
void SkMMAPStream::setMemory(const void* data, size_t length, bool copyData)
{
this->closeMMap();
this->INHERITED::setMemory(data, length, copyData);
}
void SkMMAPStream::closeMMap()
{
if (fFildes >= 0)
{
munmap(fAddr, fSize);
close(fFildes);
fFildes = -1;
}
}
|
