/// <exception cref="NGit.Errors.CorruptObjectException"></exception>
/// <exception cref="System.IO.IOException"></exception>
internal PackIndexV1(InputStream fd, byte[] hdr)
{
byte[] fanoutTable = new byte[IDX_HDR_LEN];
System.Array.Copy(hdr, 0, fanoutTable, 0, hdr.Length);
IOUtil.ReadFully(fd, fanoutTable, hdr.Length, IDX_HDR_LEN - hdr.Length);
idxHeader = new long[256];
// really unsigned 32-bit...
for (int k = 0; k < idxHeader.Length; k++)
{
idxHeader[k] = NB.DecodeUInt32(fanoutTable, k * 4);
}
idxdata = new byte[idxHeader.Length][];
for (int k_1 = 0; k_1 < idxHeader.Length; k_1++)
{
int n;
if (k_1 == 0)
{
n = (int)(idxHeader[k_1]);
}
else
{
n = (int)(idxHeader[k_1] - idxHeader[k_1 - 1]);
}
if (n > 0)
{
idxdata[k_1] = new byte[n * (Constants.OBJECT_ID_LENGTH + 4)];
IOUtil.ReadFully(fd, idxdata[k_1], 0, idxdata[k_1].Length);
}
}
objectCnt = idxHeader[255];
packChecksum = new byte[20];
IOUtil.ReadFully(fd, packChecksum, 0, packChecksum.Length);
}
/// <exception cref="System.IO.IOException"></exception>
private void OnOpenPack()
{
PackIndex idx = Idx();
byte[] buf = new byte[20];
fd.Seek(0);
fd.ReadFully(buf, 0, 12);
if (RawParseUtils.Match(buf, 0, Constants.PACK_SIGNATURE) != 4)
{
throw new IOException(JGitText.Get().notAPACKFile);
}
long vers = NB.DecodeUInt32(buf, 4);
long packCnt = NB.DecodeUInt32(buf, 8);
if (vers != 2 && vers != 3)
{
throw new IOException(MessageFormat.Format(JGitText.Get().unsupportedPackVersion,
Sharpen.Extensions.ValueOf(vers)));
}
if (packCnt != idx.GetObjectCount())
{
throw new PackMismatchException(MessageFormat.Format(JGitText.Get().packObjectCountMismatch
, Sharpen.Extensions.ValueOf(packCnt), Sharpen.Extensions.ValueOf(idx.GetObjectCount
()), GetPackFile()));
}
fd.Seek(length - 20);
fd.ReadFully(buf, 0, 20);
if (!Arrays.Equals(buf, packChecksum))
{
throw new PackMismatchException(MessageFormat.Format(JGitText.Get().packObjectCountMismatch
, ObjectId.FromRaw(buf).Name, ObjectId.FromRaw(idx.packChecksum).Name, GetPackFile
()));
}
}
/// <exception cref="NGit.Errors.MissingObjectException"></exception>
internal override long FindCRC32(AnyObjectId objId)
{
int levelOne = objId.FirstByte;
int levelTwo = BinarySearchLevelTwo(objId, levelOne);
if (levelTwo == -1)
{
throw new MissingObjectException(objId.Copy(), "unknown");
}
return(NB.DecodeUInt32(crc32[levelOne], levelTwo << 2));
}
public override long FindCRC32(AnyObjectId objId)
{
int levelOne = objId.GetFirstByte();
int levelTwo = BinarySearchLevelTwo(objId, levelOne);
if (levelTwo == -1)
{
throw new MissingObjectException(objId.Copy(), ObjectType.Unknown);
}
return(NB.DecodeUInt32(_crc32[levelOne], levelTwo << 2));
}
// p * 5
internal override long FindOffset(AnyObjectId objId)
{
int levelOne = objId.FirstByte;
int levelTwo = BinarySearchLevelTwo(objId, levelOne);
if (levelTwo == -1)
{
return(-1);
}
long p = NB.DecodeUInt32(offset32[levelOne], levelTwo << 2);
if ((p & IS_O64) != 0)
{
return(NB.DecodeUInt64(offset64, (8 * (int)(p & ~IS_O64))));
}
return(p);
}
public override PackIndex.MutableEntry Next()
{
for (; this.levelOne < this._enclosing.idxdata.Length; this.levelOne++)
{
if (this._enclosing.idxdata[this.levelOne] == null)
{
continue;
}
if (this.levelTwo < this._enclosing.idxdata[this.levelOne].Length)
{
this.entry.offset = NB.DecodeUInt32(this._enclosing.idxdata[this.levelOne], this.
levelTwo);
this.levelTwo += Constants.OBJECT_ID_LENGTH + 4;
this.returnedNumber++;
return(this.entry);
}
this.levelTwo = 0;
}
throw new NoSuchElementException();
}
protected override MutableEntry InnerNext(MutableEntry entry)
{
for (; _levelOne < _index._idxdata.Length; _levelOne++)
{
if (_index._idxdata[_levelOne] == null)
{
continue;
}
if (_levelTwo < _index._idxdata[_levelOne].Length)
{
entry.Offset = NB.DecodeUInt32(_index._idxdata[_levelOne], _levelTwo);
_levelTwo += AnyObjectId.ObjectIdLength + 4;
ReturnedNumber++;
return(entry);
}
_levelTwo = 0;
}
throw new IndexOutOfRangeException();
}
public override PackIndex.MutableEntry Next()
{
for (; this.levelOne < this._enclosing.names.Length; this.levelOne++)
{
if (this.levelTwo < this._enclosing.names[this.levelOne].Length)
{
int idx = this.levelTwo / (Constants.OBJECT_ID_LENGTH / 4) * 4;
long offset = NB.DecodeUInt32(this._enclosing.offset32[this.levelOne], idx);
if ((offset & PackIndexV2.IS_O64) != 0)
{
idx = (8 * (int)(offset & ~PackIndexV2.IS_O64));
offset = NB.DecodeUInt64(this._enclosing.offset64, idx);
}
this.entry.offset = offset;
this.levelTwo += Constants.OBJECT_ID_LENGTH / 4;
this.returnedNumber++;
return(this.entry);
}
this.levelTwo = 0;
}
throw new NoSuchElementException();
}
private void ReadPackHeader()
{
int hdrln = Constants.PACK_SIGNATURE.Length + 4 + 4;
int p = FillFromInput(hdrln);
for (int k = 0; k < Constants.PACK_SIGNATURE.Length; k++)
{
if (_buffer[p + k] != Constants.PACK_SIGNATURE[k])
{
throw new IOException("Not a PACK file.");
}
}
long vers = NB.DecodeUInt32(_buffer, p + 4);
if (vers != 2 && vers != 3)
{
throw new IOException("Unsupported pack version " + vers + ".");
}
_objectCount = NB.decodeUInt32(_buffer, p + 8);
Use(hdrln);
}
protected override MutableEntry InnerNext(MutableEntry entry)
{
for (; _levelOne < _index._names.Length; _levelOne++)
{
if (_levelTwo < _index._names[_levelOne].Length)
{
int idx = _levelTwo / (Constants.OBJECT_ID_LENGTH / 4) * 4;
long offset = NB.DecodeUInt32(_index._offset32[_levelOne], idx);
if ((offset & IS_O64) != 0)
{
idx = (8 * (int)(offset & ~IS_O64));
offset = NB.DecodeUInt64(_index._offset64, idx);
}
entry.Offset = offset;
_levelTwo += Constants.OBJECT_ID_LENGTH / 4;
ReturnedNumber++;
return(entry);
}
_levelTwo = 0;
}
throw new IndexOutOfRangeException();
}
/// <exception cref="System.IO.IOException"></exception>
internal PackIndexV2(InputStream fd)
{
byte[] fanoutRaw = new byte[4 * FANOUT];
IOUtil.ReadFully(fd, fanoutRaw, 0, fanoutRaw.Length);
fanoutTable = new long[FANOUT];
for (int k = 0; k < FANOUT; k++)
{
fanoutTable[k] = NB.DecodeUInt32(fanoutRaw, k * 4);
}
objectCnt = fanoutTable[FANOUT - 1];
names = new int[FANOUT][];
offset32 = new byte[FANOUT][];
crc32 = new byte[FANOUT][];
// Object name table. The size we can permit per fan-out bucket
// is limited to Java's 2 GB per byte array limitation. That is
// no more than 107,374,182 objects per fan-out.
//
for (int k_1 = 0; k_1 < FANOUT; k_1++)
{
long bucketCnt;
if (k_1 == 0)
{
bucketCnt = fanoutTable[k_1];
}
else
{
bucketCnt = fanoutTable[k_1] - fanoutTable[k_1 - 1];
}
if (bucketCnt == 0)
{
names[k_1] = NO_INTS;
offset32[k_1] = NO_BYTES;
crc32[k_1] = NO_BYTES;
continue;
}
long nameLen = bucketCnt * Constants.OBJECT_ID_LENGTH;
if (nameLen > int.MaxValue)
{
throw new IOException(JGitText.Get().indexFileIsTooLargeForJgit);
}
int intNameLen = (int)nameLen;
byte[] raw = new byte[intNameLen];
int[] bin = new int[(int)(((uint)intNameLen) >> 2)];
IOUtil.ReadFully(fd, raw, 0, raw.Length);
for (int i = 0; i < bin.Length; i++)
{
bin[i] = NB.DecodeInt32(raw, i << 2);
}
names[k_1] = bin;
offset32[k_1] = new byte[(int)(bucketCnt * 4)];
crc32[k_1] = new byte[(int)(bucketCnt * 4)];
}
// CRC32 table.
for (int k_2 = 0; k_2 < FANOUT; k_2++)
{
IOUtil.ReadFully(fd, crc32[k_2], 0, crc32[k_2].Length);
}
// 32 bit offset table. Any entries with the most significant bit
// set require a 64 bit offset entry in another table.
//
int o64cnt = 0;
for (int k_3 = 0; k_3 < FANOUT; k_3++)
{
byte[] ofs = offset32[k_3];
IOUtil.ReadFully(fd, ofs, 0, ofs.Length);
for (int p = 0; p < ofs.Length; p += 4)
{
if (((sbyte)ofs[p]) < 0)
{
o64cnt++;
}
}
}
// 64 bit offset table. Most objects should not require an entry.
//
if (o64cnt > 0)
{
offset64 = new byte[o64cnt * 8];
IOUtil.ReadFully(fd, offset64, 0, offset64.Length);
}
else
{
offset64 = NO_BYTES;
}
packChecksum = new byte[20];
IOUtil.ReadFully(fd, packChecksum, 0, packChecksum.Length);
}
public PackIndexV2(Stream fd)
{
var fanoutRaw = new byte[4 * FANOUT];
IO.ReadFully(fd, fanoutRaw, 0, fanoutRaw.Length);
_fanoutTable = new long[FANOUT];
for (int k = 0; k < FANOUT; k++)
{
_fanoutTable[k] = NB.DecodeUInt32(fanoutRaw, k * 4);
}
ObjectCount = _fanoutTable[FANOUT - 1];
_names = new int[FANOUT][];
_offset32 = new byte[FANOUT][];
_crc32 = new byte[FANOUT][];
// object name table. The size we can permit per fan-out bucket
// is limited to Java's 2 GB per byte array limitation. That is
// no more than 107,374,182 objects per fan-out.
//
for (int k = 0; k < FANOUT; k++)
{
long bucketCnt;
if (k == 0)
{
bucketCnt = _fanoutTable[k];
}
else
{
bucketCnt = _fanoutTable[k] - _fanoutTable[k - 1];
}
if (bucketCnt == 0)
{
_names[k] = NoInts;
_offset32[k] = NoBytes;
_crc32[k] = NoBytes;
continue;
}
long nameLen = bucketCnt * Constants.OBJECT_ID_LENGTH;
if (nameLen > int.MaxValue)
{
throw new IOException("Index file is too large");
}
var intNameLen = (int)nameLen;
var raw = new byte[intNameLen];
var bin = new int[intNameLen >> 2];
IO.ReadFully(fd, raw, 0, raw.Length);
for (int i = 0; i < bin.Length; i++)
{
bin[i] = NB.DecodeInt32(raw, i << 2);
}
_names[k] = bin;
_offset32[k] = new byte[(int)(bucketCnt * 4)];
_crc32[k] = new byte[(int)(bucketCnt * 4)];
}
// CRC32 table.
for (int k = 0; k < FANOUT; k++)
{
IO.ReadFully(fd, _crc32[k], 0, _crc32[k].Length);
}
// 32 bit offset table. Any entries with the most significant bit
// set require a 64 bit offset entry in another table.
//
int o64cnt = 0;
for (int k = 0; k < FANOUT; k++)
{
byte[] ofs = _offset32[k];
IO.ReadFully(fd, ofs, 0, ofs.Length);
for (int p = 0; p < ofs.Length; p += 4)
{
if (NB.ConvertUnsignedByteToSigned(ofs[p]) < 0)
{
o64cnt++;
}
}
}
// 64 bit offset table. Most objects should not require an entry.
//
if (o64cnt > 0)
{
_offset64 = new byte[o64cnt * 8];
IO.ReadFully(fd, _offset64, 0, _offset64.Length);
}
else
{
_offset64 = NoBytes;
}
PackChecksum = new byte[20];
IO.ReadFully(fd, PackChecksum, 0, PackChecksum.Length);
}
/// <exception cref="System.IO.IOException"></exception>
internal virtual long ReadUInt32()
{
ReadFully(intbuf, 0, 4);
return(NB.DecodeUInt32(intbuf, 0));
}
/// <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);
}
}
