/// <exception cref="System.IO.IOException"></exception>
/// <exception cref="ICSharpCode.SharpZipLib.SharpZipBaseException"></exception>
private byte[] Decompress(long position, int sz, WindowCursor curs)
{
byte[] dstbuf;
try
{
dstbuf = new byte[sz];
}
catch (OutOfMemoryException)
{
// The size may be larger than our heap allows, return null to
// let the caller know allocation isn't possible and it should
// use the large object streaming approach instead.
//
// For example, this can occur when sz is 640 MB, and JRE
// maximum heap size is only 256 MB. Even if the JRE has
// 200 MB free, it cannot allocate a 640 MB byte array.
return(null);
}
if (curs.Inflate(this, position, dstbuf, 0) != sz)
{
throw new EOFException(MessageFormat.Format(JGitText.Get().shortCompressedStreamAt
, Sharpen.Extensions.ValueOf(position)));
}
return(dstbuf);
}
/// <exception cref="System.IO.IOException"></exception>
/// <exception cref="ICSharpCode.SharpZipLib.SharpZipBaseException"></exception>
internal virtual byte[] GetDeltaHeader(WindowCursor wc, long pos)
{
// The delta stream starts as two variable length integers. If we
// assume they are 64 bits each, we need 16 bytes to encode them,
// plus 2 extra bytes for the variable length overhead. So 18 is
// the longest delta instruction header.
//
byte[] hdr = new byte[18];
wc.Inflate(this, pos, hdr, 0);
return(hdr);
}