private void WriteEntry(GitPackIndexEntry last, GitPackIndexEntry entry)
{
Console.WriteLine(
"\t{0} [{1}-{2}] (Len: {3})",
BitConverter.ToString(last.Hash).Replace("-", "").ToLower(),
last.Offset.ToString("X10"),
entry == null ? "<EOF>" : entry.Offset.ToString("X10"),
entry == null ? "<Rest Of File>" : FormatSize(entry.Offset - last.Offset));
}
private DatabaseObject GetObjectCore(long objectOffset, Stream packFile, bool recursing)
{
long size = 0;
DatabaseObjectType type = DatabaseObjectType.Null;
using (BinaryReader rdr = new BinaryReader(packFile, Encoding.UTF8, leaveOpen: true))
{
packFile.Seek(objectOffset, SeekOrigin.Begin);
// ==01234567==
// | 1TTTSSSS |
// ============
// T = Type
// S = Size Start
var sizeAndType = rdr.ReadVarInteger(3);
type = InterpretType(sizeAndType.Item1);
size = sizeAndType.Item2;
long deltaOffset = -1;
if (type == DatabaseObjectType.OffsetDelta)
{
// This isn't _quite_ a var-integer as ReadVarInteger supports
byte read = rdr.ReadByte();
long offset = read & 0x7F;
while ((read & 0x80) == 0x80)
{
offset += 1;
offset <<= 7;
read = rdr.ReadByte();
offset += (read & 0x7F);
}
deltaOffset = objectOffset - offset;
}
else if (type == DatabaseObjectType.HashDelta)
{
byte[] hash = rdr.ReadBytes(20);
GitPackIndexEntry entry = Index.GetEntry(hash);
deltaOffset = entry.Offset;
}
byte[] data = Compression.WrapStreamForDecompression(packFile)
.ReadBytes(size);
if (deltaOffset >= 0)
{
DatabaseObject source = GetObjectCore(deltaOffset, packFile, recursing: true);
return(ConstructFromDelta(source, data));
}
else
{
return(new DatabaseObject(type, data));
}
}
}
public virtual DatabaseObject GetObject(string hash)
{
// Look up the object in the index
byte[] hashData = BitUtils.FromHexString(hash);
GitPackIndexEntry entry = Index.GetEntry(hashData);
if (entry == null)
{
return(null);
}
// Open the pack file and read the object out
Stream packFile = FileSystem.Open(PackFileName, FileAccess.Read, create: false);
return(GetObjectCore(entry.Offset, packFile, recursing: false));
}
