140 lines
3.2 KiB
C++
140 lines
3.2 KiB
C++
#include "VxMemoryMappedFile.hpp"
|
|
#include "../VTEncoding.hpp"
|
|
|
|
namespace LibCmo::VxMath {
|
|
|
|
VxMemoryMappedFile::VxMemoryMappedFile(const char* u8_filepath) :
|
|
// init members
|
|
#if defined(LIBCMO_OS_WIN32)
|
|
m_hFile(NULL), m_hFileMapping(NULL), m_hFileMapView(NULL),
|
|
m_dwFileSizeLow(0), m_dwFileSizeHigh(0),
|
|
#else
|
|
m_hFile(-1), m_offFileSize(0), m_pFileAddr((void*)-1),
|
|
#endif
|
|
m_szFilePath(),
|
|
m_bIsValid(false), m_pMemoryMappedFileBase(nullptr), m_cbFile(0u) {
|
|
|
|
// save file path
|
|
#if defined(LIBCMO_OS_WIN32)
|
|
EncodingHelper::SetStdPathFromU8Path(m_szFilePath, u8_filepath);
|
|
#else
|
|
this->m_szFilePath = u8_filepath;
|
|
#endif
|
|
|
|
// real mapping work
|
|
#if defined(LIBCMO_OS_WIN32)
|
|
|
|
// open file
|
|
this->m_hFile = CreateFileW(
|
|
this->m_szFilePath.wstring().c_str(),
|
|
GENERIC_READ,
|
|
0, // do not share
|
|
NULL, // no security
|
|
OPEN_EXISTING,
|
|
FILE_ATTRIBUTE_NORMAL, // no attr
|
|
NULL // no template
|
|
);
|
|
if (this->m_hFile == INVALID_HANDLE_VALUE) {
|
|
return;
|
|
}
|
|
|
|
// get size
|
|
m_dwFileSizeLow = ::GetFileSize(this->m_hFile, &this->m_dwFileSizeHigh);
|
|
if (m_dwFileSizeLow == INVALID_FILE_SIZE) {
|
|
CloseHandle(this->m_hFile);
|
|
return;
|
|
}
|
|
|
|
// open mapping
|
|
this->m_hFileMapping = CreateFileMappingW(
|
|
this->m_hFile,
|
|
NULL, // default security
|
|
PAGE_READONLY,
|
|
0, 0, // expand to file size
|
|
NULL // no name
|
|
);
|
|
if (this->m_hFileMapping == NULL) {
|
|
CloseHandle(this->m_hFile);
|
|
return;
|
|
}
|
|
|
|
// open map view
|
|
this->m_hFileMapView = MapViewOfFile(
|
|
this->m_hFileMapping,
|
|
FILE_MAP_READ,
|
|
0, 0, //no offset
|
|
0 // expand to full file size
|
|
);
|
|
if (this->m_hFileMapView == NULL) {
|
|
CloseHandle(m_hFileMapping);
|
|
CloseHandle(m_hFile);
|
|
}
|
|
|
|
// write member data
|
|
m_pMemoryMappedFileBase = m_hFileMapView;
|
|
m_cbFile = static_cast<size_t>(static_cast<uint64_t>(m_dwFileSizeLow) | (static_cast<uint64_t>(m_dwFileSizeHigh) << 32));
|
|
|
|
#else
|
|
// create file
|
|
// we do not need provide mode_t, because is served for new created file.
|
|
// we are opening a existed file.
|
|
this->m_hFile = open(m_szFilePath.string().c_str(), O_RDONLY);
|
|
if (m_hFile == -1) {
|
|
return;
|
|
}
|
|
|
|
// calculate file size
|
|
struct stat sb;
|
|
int err = fstat(m_hFile, &sb);
|
|
// if failed or not a regular file, exit
|
|
if (err == -1 || (sb.st_mode & S_IFMT) != S_IFREG) {
|
|
close(m_hFile);
|
|
return;
|
|
}
|
|
// setup size
|
|
this->m_offFileSize = sb.st_size;
|
|
|
|
// map file
|
|
this->m_pFileAddr = mmap(
|
|
nullptr, // request linux distribute one
|
|
this->m_offFileSize, // map the full file
|
|
PROT_READ, // only for reading
|
|
MAP_PRIVATE,
|
|
this->m_hFile,
|
|
0 // no offset
|
|
);
|
|
if (this->m_pFileAddr == MAP_FAILED) {
|
|
close(m_hFile);
|
|
return;
|
|
}
|
|
|
|
// write member data
|
|
m_pMemoryMappedFileBase = m_pFileAddr;
|
|
m_cbFile = static_cast<size_t>(this->m_offFileSize);
|
|
#endif
|
|
|
|
// set valid
|
|
this->m_bIsValid = true;
|
|
}
|
|
|
|
VxMemoryMappedFile::~VxMemoryMappedFile(void) {
|
|
if (this->m_bIsValid) {
|
|
// only success mapping need free
|
|
this->m_bIsValid = false;
|
|
m_cbFile = 0;
|
|
m_pMemoryMappedFileBase = nullptr;
|
|
|
|
#if defined(LIBCMO_OS_WIN32)
|
|
UnmapViewOfFile(this->m_hFileMapView);
|
|
CloseHandle(m_hFileMapping);
|
|
CloseHandle(m_hFile);
|
|
#else
|
|
munmap(this->m_pFileAddr, this->m_offFileSize);
|
|
close(m_hFile);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
|
|
}
|