/// <summary>Compute the name of an object, without inserting it.</summary>
/// <remarks>Compute the name of an object, without inserting it.</remarks>
/// <param name="type">type code of the object to store.</param>
/// <param name="data">complete content of the object.</param>
/// <param name="off">
/// first position within
/// <code>data</code>
/// .
/// </param>
/// <param name="len">
/// number of bytes to copy from
/// <code>data</code>
/// .
/// </param>
/// <returns>the name of the object.</returns>
public virtual ObjectId IdFor(int type, byte[] data, int off, int len)
{
MessageDigest md = Digest();
md.Update(Constants.EncodedTypeString(type));
md.Update(unchecked ((byte)' '));
md.Update(Constants.EncodeASCII(len));
md.Update(unchecked ((byte)0));
md.Update(data, off, len);
return(ObjectId.FromRaw(md.Digest()));
}
/// <summary>Compute the name of an object, without inserting it.</summary>
/// <remarks>Compute the name of an object, without inserting it.</remarks>
/// <param name="objectType">type code of the object to store.</param>
/// <param name="length">
/// number of bytes to scan from
/// <code>in</code>
/// .
/// </param>
/// <param name="in">
/// stream providing the object content. The caller is responsible
/// for closing the stream.
/// </param>
/// <returns>the name of the object.</returns>
/// <exception cref="System.IO.IOException">the source stream could not be read.</exception>
public virtual ObjectId IdFor(int objectType, long length, InputStream @in)
{
MessageDigest md = Digest();
md.Update(Constants.EncodedTypeString(objectType));
md.Update(unchecked ((byte)' '));
md.Update(Constants.EncodeASCII(length));
md.Update(unchecked ((byte)0));
byte[] buf = Buffer();
while (length > 0)
{
int n = @in.Read(buf, 0, (int)Math.Min(length, buf.Length));
if (n < 0)
{
throw new EOFException("Unexpected end of input");
}
md.Update(buf, 0, n);
length -= n;
}
return(ObjectId.FromRaw(md.Digest()));
}