/// <summary>
/// Gets a 128-bit hash of the specified file.
/// </summary>
/// <param name="path">Path to the file</param>
/// <param name="hash">Integer array of length 4 which receives the
/// four 32-bit parts of the hash value.</param>
/// <exception cref="FileNotFoundException">the file does not exist or
/// could not be read</exception>
/// <remarks><p>
/// Win32 MSI API:
/// <a href="http://msdn.microsoft.com/library/en-us/msi/setup/msigetfilehash.asp">MsiGetFileHash</a>
/// </p></remarks>
public static void GetFileHash(string path, int[] hash)
{
if (hash == null)
{
throw new ArgumentNullException("hash");
}
uint[] tempHash = new uint[5];
tempHash[0] = 20;
uint ret = NativeMethods.MsiGetFileHash(path, 0, tempHash);
if (ret != 0)
{
if (ret == (uint)NativeMethods.Error.FILE_NOT_FOUND ||
ret == (uint)NativeMethods.Error.ACCESS_DENIED)
{
throw new FileNotFoundException(null, path);
}
else
{
throw InstallerException.ExceptionFromReturnCode(ret);
}
}
for (int i = 0; i < 4; i++)
{
hash[i] = unchecked ((int)tempHash[i + 1]);
}
}
