/// <exception cref="System.IO.IOException"></exception>
/// <exception cref="NGit.Errors.CorruptObjectException"></exception>
private void ReadFrom(InputStream inStream)
{
BufferedInputStream @in = new BufferedInputStream(inStream);
MessageDigest md = Constants.NewMessageDigest();
// Read the index header and verify we understand it.
//
byte[] hdr = new byte[20];
IOUtil.ReadFully(@in, hdr, 0, 12);
md.Update(hdr, 0, 12);
if (!Is_DIRC(hdr))
{
throw new CorruptObjectException(JGitText.Get().notADIRCFile);
}
int ver = NB.DecodeInt32(hdr, 4);
bool extended = false;
if (ver == 3)
{
extended = true;
}
else
{
if (ver != 2)
{
throw new CorruptObjectException(MessageFormat.Format(JGitText.Get().unknownDIRCVersion
, ver));
}
}
entryCnt = NB.DecodeInt32(hdr, 8);
if (entryCnt < 0)
{
throw new CorruptObjectException(JGitText.Get().DIRCHasTooManyEntries);
}
// Load the individual file entries.
//
int infoLength = DirCacheEntry.GetMaximumInfoLength(extended);
byte[] infos = new byte[infoLength * entryCnt];
sortedEntries = new DirCacheEntry[entryCnt];
MutableInteger infoAt = new MutableInteger();
for (int i = 0; i < entryCnt; i++)
{
sortedEntries[i] = new DirCacheEntry(infos, infoAt, @in, md);
}
snapshot = FileSnapshot.Save(liveFile);
// After the file entries are index extensions, and then a footer.
//
for (; ;)
{
@in.Mark(21);
IOUtil.ReadFully(@in, hdr, 0, 20);
if (@in.Read() < 0)
{
// No extensions present; the file ended where we expected.
//
break;
}
@in.Reset();
md.Update(hdr, 0, 8);
IOUtil.SkipFully(@in, 8);
long sz = NB.DecodeUInt32(hdr, 4);
switch (NB.DecodeInt32(hdr, 0))
{
case EXT_TREE:
{
if (int.MaxValue < sz)
{
throw new CorruptObjectException(MessageFormat.Format(JGitText.Get().DIRCExtensionIsTooLargeAt
, FormatExtensionName(hdr), sz));
}
byte[] raw = new byte[(int)sz];
IOUtil.ReadFully(@in, raw, 0, raw.Length);
md.Update(raw, 0, raw.Length);
tree = new DirCacheTree(raw, new MutableInteger(), null);
break;
}
default:
{
if (hdr[0] >= 'A' && ((sbyte)hdr[0]) <= 'Z')
{
// The extension is optional and is here only as
// a performance optimization. Since we do not
// understand it, we can safely skip past it, after
// we include its data in our checksum.
//
SkipOptionalExtension(@in, md, hdr, sz);
}
else
{
// The extension is not an optimization and is
// _required_ to understand this index format.
// Since we did not trap it above we must abort.
//
throw new CorruptObjectException(MessageFormat.Format(JGitText.Get().DIRCExtensionNotSupportedByThisVersion
, FormatExtensionName(hdr)));
}
break;
}
}
}
byte[] exp = md.Digest();
if (!Arrays.Equals(exp, hdr))
{
throw new CorruptObjectException(JGitText.Get().DIRCChecksumMismatch);
}
}
/// <summary>The default constructor with a default message</summary>
public DetachedHeadException() : this(JGitText.Get().detachedHeadDetected)
{
}