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#include <MMap.h>
#ifdef _WIN32
#include <windows.h>
#endif
namespace Balau {
#ifdef _WIN32
class MMapPlatform {
public:
std::tuple<bool, const uint8_t *, size_t> open(String fname) {
bool result = false;
size_t s = 0;
TCHAR * fnameTchar;
#ifdef UNICODE
fname.do_iconv("UTF-8", "UNICODELITTLE");
fnameTchar = (TCHAR *) alloca(fname.strlen() + 2);
memset(fnameTchar, 0, fname.strlen() + 2);
memcpy(fnameTchar, fname.to_charp(), fname.strlen());
#else
fnameTchar = fname.to_charp();
#endif
m_handle = CreateFile(fnameTchar, GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
if (m_handle == INVALID_HANDLE_VALUE)
return std::tie(result, m_ptr, s);
ScopedLambda hc([&]() { if (!result) CloseHandle(m_handle); });
LARGE_INTEGER fsize;
if (!GetFileSizeEx(m_handle, (PLARGE_INTEGER) &fsize))
return std::tie(result, m_ptr, s);
s = fsize.QuadPart;
m_mapObject = CreateFileMapping(m_handle, 0, PAGE_READONLY, fsize.HighPart, fsize.LowPart, NULL);
if (m_mapObject == NULL) // right, because getting NULL (which is 0) is better
return std::tie(result, m_ptr, s); // than getting the usual INVALID_HANDLE_VALUE (which is -1),
// in order to make a sane and uniform API...
{
ScopedLambda mc([&]() { if (!result) CloseHandle(m_mapObject); });
// and of course, CreateFileMapping takes the 64 bits size in high / low format,
// whereas MapViewOfFile takes the 64 bits size in a single 64 bits size_t. Sure. Makes sense.
m_ptr = (const uint8_t *)MapViewOfFile(m_mapObject, FILE_MAP_READ, 0, 0, s);
result = !!m_ptr;
}
return std::tie(result, m_ptr, s);
}
void close() {
if (m_ptr)
UnmapViewOfFile(m_ptr);
if (m_mapObject)
CloseHandle(m_mapObject);
if (m_handle != INVALID_HANDLE_VALUE)
CloseHandle(m_handle);
m_ptr = NULL;
m_mapObject = (HANDLE) NULL;
m_handle = INVALID_HANDLE_VALUE;
}
HANDLE m_handle = INVALID_HANDLE_VALUE;
HANDLE m_mapObject = (HANDLE) NULL; // see comment above
const uint8_t * m_ptr = NULL;
};
#endif
};
Balau::MMap::MMap(const char * fname) {
m_fname = fname;
m_name.set("mmap of %s", m_fname);
m_platform = new MMapPlatform();
}
void Balau::MMap::open() {
bool result;
const uint8_t * ptr;
size_t s;
std::tie(result, ptr, s) = m_platform->open(m_fname);
if (!result)
throw GeneralException("Unable to map file");
borrow(ptr, s);
}
void Balau::MMap::close() {
m_platform->close();
Buffer::close();
}
Balau::MMap::~MMap() {
delete m_platform;
}
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