int filemap(const TCHAR *name,
void (*processor)(const void *, size_t, const TCHAR *, void *arg),
void *arg)
{
HANDLE f;
HANDLE m;
DWORD size;
DWORD sizeHi;
void *p;
f = CreateFile(name, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (f == INVALID_HANDLE_VALUE) {
win32perror(name);
return 0;
}
size = GetFileSize(f, &sizeHi);
if (size == (DWORD)-1) {
win32perror(name);
return 0;
}
if (sizeHi) {
_ftprintf(stderr, _T("%s: bigger than 2Gb\n"), name);
return 0;
}
/* CreateFileMapping barfs on zero length files */
if (size == 0) {
static const char c = '\0';
processor(&c, 0, name, arg);
CloseHandle(f);
return 1;
}
m = CreateFileMapping(f, NULL, PAGE_READONLY, 0, 0, NULL);
if (m == NULL) {
win32perror(name);
CloseHandle(f);
return 0;
}
p = MapViewOfFile(m, FILE_MAP_READ, 0, 0, 0);
if (p == NULL) {
win32perror(name);
CloseHandle(m);
CloseHandle(f);
return 0;
}
processor(p, size, name, arg);
UnmapViewOfFile(p);
CloseHandle(m);
CloseHandle(f);
return 1;
}
LPTSTR get_str_property(HDEVINFO hDevInfo, SP_DEVINFO_DATA* DeviceInfoData, DWORD prop)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
//
// Call function with null to begin with,
// then use the returned buffer size (doubled)
// to Alloc the buffer. Keep calling until
// success or an unknown failure.
//
// Double the returned buffersize to correct
// for underlying legacy CM functions that
// return an incorrect buffersize value on
// DBCS/MBCS systems.
//
while (!SetupDiGetDeviceRegistryProperty(hDevInfo, DeviceInfoData,
prop, &DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
// Change the buffer size.
if (buffer) LocalFree(buffer);
// Double the size to avoid problems on
// W2k MBCS systems per KB 888609.
buffer = LocalAlloc(LPTR,buffersize * 2);
if (!buffer)
return NULL;
}
else
{
// Insert error handling here.
win32perror("SetupDiGetDeviceRegistryProperty()");
if (buffer) LocalFree(buffer);
return NULL;
}
}
return buffer;
}
