public static uint GetCrc(string path)
{
BestHTTP.Decompression.Crc.CRC32 checker = new BestHTTP.Decompression.Crc.CRC32();
using (FileStream stream = File.OpenRead(path))
{
return((uint)checker.GetCrc32(stream));
}
}
public static bool CheckCrc(string path, uint crc)
{
if (crc == 0)
{
return(true);
}
BestHTTP.Decompression.Crc.CRC32 checker = new BestHTTP.Decompression.Crc.CRC32();
using (FileStream stream = File.OpenRead(path))
{
uint result = (uint)checker.GetCrc32(stream);
//Debug.Log("CheckCrc " + path + " " + result + " " + crc + " " + (int)result + " " + (int)crc);
if (result == crc)
{
return(true);
}
}
return(false);
}
// This ctor is private - no validation is done here. This is to allow the use
// of a (specific) negative value for the _lengthLimit, to indicate that there
// is no length set. So we validate the length limit in those ctors that use an
// explicit param, otherwise we don't validate, because it could be our special
// value.
private CrcCalculatorStream
(bool leaveOpen, Int64 length, System.IO.Stream stream, CRC32 crc32)
: base()
{
_innerStream = stream;
_Crc32 = crc32 ?? new CRC32();
_lengthLimit = length;
_leaveOpen = leaveOpen;
}
/// <summary>
/// A constructor allowing the specification of the length of the stream
/// to read, as well as whether to keep the underlying stream open upon
/// Close(), and the CRC32 instance to use.
/// </summary>
/// <remarks>
/// <para>
/// The stream uses the specified CRC32 instance, which allows the
/// application to specify how the CRC gets calculated.
/// </para>
/// </remarks>
/// <param name="stream">The underlying stream</param>
/// <param name="length">The length of the stream to slurp</param>
/// <param name="leaveOpen">true to leave the underlying stream
/// open upon close of the <c>CrcCalculatorStream</c>; false otherwise.</param>
/// <param name="crc32">the CRC32 instance to use to calculate the CRC32</param>
public CrcCalculatorStream(System.IO.Stream stream, Int64 length, bool leaveOpen,
CRC32 crc32)
: this(leaveOpen, length, stream, crc32)
{
if (length < 0)
throw new ArgumentException("length");
}
