internal static ImmutableArray <byte> CalculateChecksum(byte[] buffer, int offset, int count, SourceHashAlgorithm algorithmId)
{
using (var algorithm = CryptographicHashProvider.TryGetAlgorithm(algorithmId))
{
Debug.Assert(algorithm != null);
return(ImmutableArray.Create(algorithm.ComputeHash(buffer, offset, count)));
}
}
internal static ImmutableArray <byte> CalculateChecksum(Stream stream, SourceHashAlgorithm algorithmId)
{
using (var algorithm = CryptographicHashProvider.TryGetAlgorithm(algorithmId))
{
Debug.Assert(algorithm != null);
if (stream.CanSeek)
{
stream.Seek(0, SeekOrigin.Begin);
}
return(ImmutableArray.Create(algorithm.ComputeHash(stream)));
}
}
protected SourceText(ImmutableArray <byte> checksum = default,
SourceHashAlgorithm checksumAlgorithm = SourceHashAlgorithm.Sha1,
SourceTextContainer container = null)
{
ValidateChecksumAlgorithm(checksumAlgorithm);
if (!checksum.IsDefault && checksum.Length != CryptographicHashProvider.GetHashSize(checksumAlgorithm))
{
throw new ArgumentException(nameof(checksum));
}
ChecksumAlgorithm = checksumAlgorithm;
_lazyChecksum = checksum;
_lazyContainer = container;
}
