public static string Hash(this FileInfo fileInfo, EHashCode hashCode)
{
switch (hashCode)
{
case EHashCode.Md5:
return fileInfo.OpenRead().CryptoHash<MD5CryptoServiceProvider>();
case EHashCode.Sha1:
return fileInfo.Sha1Hash();
case EHashCode.RipeMd160:
return fileInfo.RipeMd160Hash();
case EHashCode.Sha256:
return fileInfo.Sha256Hash();
case EHashCode.Sha384:
return fileInfo.Sha384Hash();
case EHashCode.Sha512:
return fileInfo.Sha512Hash();
default:
throw new ArgumentOutOfRangeException(nameof(hashCode), hashCode, null);
}
}
private static bool IsDifferentThan(this FileInfo fileInfo, FileInfo otherFileInfo, EHashCode hashCode , bool performByteByByte)
{
return !fileInfo.IsSameAs(otherFileInfo, hashCode, performByteByByte);
}
private static bool IsSameAs(this FileInfo fileInfo, FileInfo otherFileInfo, EHashCode hashCode, bool performByteByByte)
{
if (fileInfo.Length != otherFileInfo.Length)
return false;
if (fileInfo.Hash(hashCode) != otherFileInfo.Hash(hashCode))
return true;
//from https://support.microsoft.com/en-us/kb/320348
int file1byte;
int file2byte;
var fs1 = new FileStream(fileInfo.FullName, FileMode.Open);
var fs2 = new FileStream(otherFileInfo.FullName, FileMode.Open);
do
{
// Read one byte from each file.
file1byte = fs1.ReadByte();
file2byte = fs2.ReadByte();
}
while ((file1byte == file2byte) && (file1byte != -1));
return ((file1byte - file2byte) == 0);
}
