//pszFilename must have room for at least MaxPath+1 characters
static inline bool get_file_name_from_handle_function
(void * hFile, wchar_t *pszFilename, std::size_t length, std::size_t &out_length)
{
if(length <= MaxPath) {
return false;
}
void *hiPSAPI = load_library("PSAPI.DLL");
if (0 == hiPSAPI)
return 0;
class library_unloader
{
void *lib_;
public:
library_unloader(void *module) : lib_(module) {}
~library_unloader() {
free_library(lib_);
}
} unloader(hiPSAPI);
// Pointer to function getMappedFileName() in PSAPI.DLL
GetMappedFileName_t pfGMFN =
(GetMappedFileName_t)get_proc_address(hiPSAPI, "GetMappedFileNameW");
if (! pfGMFN) {
return 0; // Failed: unexpected error
}
bool bSuccess = false;
// Create a file mapping object.
void * hFileMap = create_file_mapping(hFile, page_readonly, 0, 1, 0);
if(hFileMap)
{
// Create a file mapping to get the file name.
void* pMem = map_view_of_file_ex(hFileMap, file_map_read, 0, 0, 1, 0);
if (pMem) {
out_length = pfGMFN(get_current_process(), pMem, pszFilename, MaxPath);
if(out_length) {
bSuccess = true;
}
unmap_view_of_file(pMem);
}
close_handle(hFileMap);
}
return(bSuccess);
}
inline void osmium::util::MemoryMapping::resize(size_t new_size) {
unmap();
m_size = new_size;
resize_fd(m_fd);
m_handle = create_file_mapping();
if (!m_handle) {
throw std::system_error(GetLastError(), std::system_category(), "CreateFileMapping failed");
}
m_addr = map_view_of_file();
if (!is_valid()) {
throw std::system_error(GetLastError(), std::system_category(), "MapViewOfFile failed");
}
}
inline osmium::util::MemoryMapping::MemoryMapping(size_t size, MemoryMapping::mapping_mode mode, int fd, off_t offset) :
m_size(check_size(size)),
m_offset(offset),
m_fd(resize_fd(fd)),
m_mapping_mode(mode),
m_handle(create_file_mapping()),
m_addr(nullptr) {
if (!m_handle) {
throw std::system_error(GetLastError(), std::system_category(), "CreateFileMapping failed");
}
m_addr = map_view_of_file();
if (!is_valid()) {
throw std::system_error(GetLastError(), std::system_category(), "MapViewOfFile failed");
}
}