/// <exception cref="System.IO.IOException"></exception>
/// <exception cref="NGit.Errors.StoredObjectRepresentationNotAvailableException"></exception>
private void CopyAsIs2(PackOutputStream @out, LocalObjectToPack src, bool validate
, WindowCursor curs)
{
CRC32 crc1 = validate ? new CRC32() : null;
CRC32 crc2 = validate ? new CRC32() : null;
byte[] buf = @out.GetCopyBuffer();
// Rip apart the header so we can discover the size.
//
ReadFully(src.offset, buf, 0, 20, curs);
int c = buf[0] & unchecked ((int)(0xff));
int typeCode = (c >> 4) & 7;
long inflatedLength = c & 15;
int shift = 4;
int headerCnt = 1;
while ((c & unchecked ((int)(0x80))) != 0)
{
c = buf[headerCnt++] & unchecked ((int)(0xff));
inflatedLength += ((long)(c & unchecked ((int)(0x7f)))) << shift;
shift += 7;
}
if (typeCode == Constants.OBJ_OFS_DELTA)
{
do
{
c = buf[headerCnt++] & unchecked ((int)(0xff));
}while ((c & 128) != 0);
if (validate)
{
crc1.Update(buf, 0, headerCnt);
crc2.Update(buf, 0, headerCnt);
}
}
else
{
if (typeCode == Constants.OBJ_REF_DELTA)
{
if (validate)
{
crc1.Update(buf, 0, headerCnt);
crc2.Update(buf, 0, headerCnt);
}
ReadFully(src.offset + headerCnt, buf, 0, 20, curs);
if (validate)
{
crc1.Update(buf, 0, 20);
crc2.Update(buf, 0, 20);
}
headerCnt += 20;
}
else
{
if (validate)
{
crc1.Update(buf, 0, headerCnt);
crc2.Update(buf, 0, headerCnt);
}
}
}
long dataOffset = src.offset + headerCnt;
long dataLength = src.length;
long expectedCRC;
ByteArrayWindow quickCopy;
// Verify the object isn't corrupt before sending. If it is,
// we report it missing instead.
//
try
{
quickCopy = curs.QuickCopy(this, dataOffset, dataLength);
if (validate && Idx().HasCRC32Support())
{
// Index has the CRC32 code cached, validate the object.
//
expectedCRC = Idx().FindCRC32(src);
if (quickCopy != null)
{
quickCopy.Crc32(crc1, dataOffset, (int)dataLength);
}
else
{
long pos = dataOffset;
long cnt = dataLength;
while (cnt > 0)
{
int n = (int)Math.Min(cnt, buf.Length);
ReadFully(pos, buf, 0, n, curs);
crc1.Update(buf, 0, n);
pos += n;
cnt -= n;
}
}
if (crc1.GetValue() != expectedCRC)
{
SetCorrupt(src.offset);
throw new CorruptObjectException(MessageFormat.Format(JGitText.Get().objectAtHasBadZlibStream
, Sharpen.Extensions.ValueOf(src.offset), GetPackFile()));
}
}
else
{
if (validate)
{
// We don't have a CRC32 code in the index, so compute it
// now while inflating the raw data to get zlib to tell us
// whether or not the data is safe.
//
Inflater inf = curs.Inflater();
byte[] tmp = new byte[1024];
if (quickCopy != null)
{
quickCopy.Check(inf, tmp, dataOffset, (int)dataLength);
}
else
{
long pos = dataOffset;
long cnt = dataLength;
while (cnt > 0)
{
int n = (int)Math.Min(cnt, buf.Length);
ReadFully(pos, buf, 0, n, curs);
crc1.Update(buf, 0, n);
inf.SetInput(buf, 0, n);
while (inf.Inflate(tmp, 0, tmp.Length) > 0)
{
continue;
}
pos += n;
cnt -= n;
}
}
if (!inf.IsFinished || inf.TotalIn != dataLength)
{
SetCorrupt(src.offset);
throw new EOFException(MessageFormat.Format(JGitText.Get().shortCompressedStreamAt
, Sharpen.Extensions.ValueOf(src.offset)));
}
expectedCRC = crc1.GetValue();
}
else
{
expectedCRC = -1;
}
}
}
catch (SharpZipBaseException dataFormat)
{
SetCorrupt(src.offset);
CorruptObjectException corruptObject = new CorruptObjectException(MessageFormat.Format
(JGitText.Get().objectAtHasBadZlibStream, Sharpen.Extensions.ValueOf(src.offset)
, GetPackFile()));
Sharpen.Extensions.InitCause(corruptObject, dataFormat);
StoredObjectRepresentationNotAvailableException gone;
gone = new StoredObjectRepresentationNotAvailableException(src);
Sharpen.Extensions.InitCause(gone, corruptObject);
throw gone;
}
catch (IOException ioError)
{
StoredObjectRepresentationNotAvailableException gone;
gone = new StoredObjectRepresentationNotAvailableException(src);
Sharpen.Extensions.InitCause(gone, ioError);
throw gone;
}
if (quickCopy != null)
{
// The entire object fits into a single byte array window slice,
// and we have it pinned. Write this out without copying.
//
@out.WriteHeader(src, inflatedLength);
quickCopy.Write(@out, dataOffset, (int)dataLength, null);
}
else
{
if (dataLength <= buf.Length)
{
// Tiny optimization: Lots of objects are very small deltas or
// deflated commits that are likely to fit in the copy buffer.
//
if (!validate)
{
long pos = dataOffset;
long cnt = dataLength;
while (cnt > 0)
{
int n = (int)Math.Min(cnt, buf.Length);
ReadFully(pos, buf, 0, n, curs);
pos += n;
cnt -= n;
}
}
@out.WriteHeader(src, inflatedLength);
@out.Write(buf, 0, (int)dataLength);
}
else
{
// Now we are committed to sending the object. As we spool it out,
// check its CRC32 code to make sure there wasn't corruption between
// the verification we did above, and us actually outputting it.
//
@out.WriteHeader(src, inflatedLength);
long pos = dataOffset;
long cnt = dataLength;
while (cnt > 0)
{
int n = (int)Math.Min(cnt, buf.Length);
ReadFully(pos, buf, 0, n, curs);
if (validate)
{
crc2.Update(buf, 0, n);
}
@out.Write(buf, 0, n);
pos += n;
cnt -= n;
}
if (validate && crc2.GetValue() != expectedCRC)
{
throw new CorruptObjectException(MessageFormat.Format(JGitText.Get().objectAtHasBadZlibStream
, Sharpen.Extensions.ValueOf(src.offset), GetPackFile()));
}
}
}
}
