private GitObjectId ResolveReference(object reference)
{
if (reference is string)
{
if (!FileHelpers.TryOpen(Path.Combine(this.CommonDirectory, (string)reference), out FileStream? stream))
{
return(GitObjectId.Empty);
}
using (stream)
{
Span <byte> objectId = stackalloc byte[40];
stream !.Read(objectId);
return(GitObjectId.ParseHex(objectId));
}
}
else if (reference is GitObjectId)
{
return((GitObjectId)reference);
}
else
{
throw new GitException();
}
}
private static GitObjectId ReadTree(ReadOnlySpan <byte> line)
{
// Format: tree d8329fc1cc938780ffdd9f94e0d364e0ea74f579\n
// 47 bytes:
// tree: 5 bytes
// space: 1 byte
// hash: 40 bytes
// \n: 1 byte
Debug.Assert(line.Slice(0, TreeStart.Length).SequenceEqual(TreeStart));
Debug.Assert(line[TreeLineLength - 1] == (byte)'\n');
return(GitObjectId.ParseHex(line.Slice(TreeStart.Length, 40)));
}
private static bool TryReadParent(ReadOnlySpan <byte> line, out GitObjectId parent)
{
// Format: "parent ef079ebcca375f6fd54aa0cb9f35e3ecc2bb66e7\n"
parent = GitObjectId.Empty;
if (!line.Slice(0, ParentStart.Length).SequenceEqual(ParentStart))
{
return(false);
}
if (line[ParentLineLength - 1] != (byte)'\n')
{
return(false);
}
parent = GitObjectId.ParseHex(line.Slice(ParentStart.Length, 40));
return(true);
}
public static object ReadReference(Span <byte> value)
{
if (value.Length == 41 && !value.StartsWith(RefPrefix))
{
// Skip the trailing \n
return(GitObjectId.ParseHex(value.Slice(0, 40)));
}
else
{
if (!value.StartsWith(RefPrefix))
{
throw new GitException();
}
// Skip the terminating \n character
return(GitRepository.GetString(value.Slice(RefPrefix.Length, value.Length - RefPrefix.Length - 1)));
}
}