private static long GetFileSize(string path)
{
if (!XLPack.IsFileExist(path))
{
return(-1);
}
long s = 0;
var position = XLPack.FOpen(path, "r");
s = XLPack.FSize(position);
XLPack.FClose(ref position);
return(s);
}
private static bool ReCalculateFileMD5(string path)
{
if (!XLPack.IsFileExist(path))
{
return(false);
}
var position = XLPack.FOpen(path, "r");
long fileSize = XLPack.FSize(position);
const int bufSize = 0x4000;
byte[] buffer = new byte[bufSize];
IntPtr bufPtr = Marshal.UnsafeAddrOfPinnedArrayElement(buffer, 0);
// TODO: Do this without reading the entire file into memory to calculate the MD5
// Maybe try to use the XLPack.DLL's MD5Init, MD5Update and MD5 Finalize functions ?
// Using ChunkedMemoryStream instead of MemoryStream to hopefully avoid outofmemory errors on large files
ChunkedMemoryStream ms = new ChunkedMemoryStream();
long readTotalSize = 0;
while (readTotalSize < fileSize)
{
long readSize = fileSize - readTotalSize;
if (readSize > bufSize)
{
readSize = bufSize;
}
XLPack.FRead(position, bufPtr, readSize);
ms.Write(buffer, 0, (int)readSize); // readSize should never be out of int range, so it's safe to cast it
readTotalSize += readSize;
}
XLPack.FClose(ref position);
ms.Position = 0;
MD5 md5Hash = MD5.Create();
string md5String = GetMd5Hash(md5Hash, ms).Replace("-", "").ToLower();
ms.Dispose();
var res = SetFileMD5(path, md5String);
return(res);
}