private static bool TryReadAuthor(ReadOnlySpan <byte> line, out GitSignature signature)
{
signature = default;
if (!line.Slice(0, AuthorStart.Length).SequenceEqual(AuthorStart))
{
return(false);
}
line = line.Slice(AuthorStart.Length);
int emailStart = line.IndexOf((byte)'<');
int emailEnd = line.IndexOf((byte)'>');
var lineEnd = line.IndexOf((byte)'\n');
var name = line.Slice(0, emailStart - 1);
var email = line.Slice(emailStart + 1, emailEnd - emailStart - 1);
var time = line.Slice(emailEnd + 2, lineEnd - emailEnd - 2);
signature.Name = GitRepository.GetString(name);
signature.Email = GitRepository.GetString(email);
var offsetStart = time.IndexOf((byte)' ');
var ticks = long.Parse(GitRepository.GetString(time.Slice(0, offsetStart)));
signature.Date = DateTimeOffset.FromUnixTimeSeconds(ticks);
return(true);
}
public static GitCommit Read(ReadOnlySpan <byte> commit, GitObjectId sha, bool readAuthor = false)
{
var buffer = commit;
var tree = ReadTree(buffer.Slice(0, TreeLineLength));
buffer = buffer.Slice(TreeLineLength);
GitObjectId? firstParent = null, secondParent = null;
List <GitObjectId>?additionalParents = null;
List <GitObjectId> parents = new List <GitObjectId>();
while (TryReadParent(buffer, out GitObjectId parent))
{
if (!firstParent.HasValue)
{
firstParent = parent;
}
else if (!secondParent.HasValue)
{
secondParent = parent;
}
else
{
additionalParents ??= new List <GitObjectId>();
additionalParents.Add(parent);
}
buffer = buffer.Slice(ParentLineLength);
}
GitSignature signature = default;
if (readAuthor && !TryReadAuthor(buffer, out signature))
{
throw new GitException();
}
return(new GitCommit()
{
Sha = sha,
FirstParent = firstParent,
SecondParent = secondParent,
AdditionalParents = additionalParents,
Tree = tree,
Author = readAuthor ? signature : (GitSignature?)null,
});
}