/// <summary>(Optionally) seek to position, read and verify data.</summary>
/// <remarks>
/// (Optionally) seek to position, read and verify data.
/// Seek to specified position if pos is non-negative.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
private void Pread(DFSInputStream @in, long pos, byte[] buffer, int offset, int length
, byte[] authenticData)
{
NUnit.Framework.Assert.IsTrue("Test buffer too small", buffer.Length >= offset +
length);
if (pos >= 0)
{
@in.Seek(pos);
}
Log.Info("Reading from file of size " + @in.GetFileLength() + " at offset " + @in
.GetPos());
while (length > 0)
{
int cnt = @in.Read(buffer, offset, length);
NUnit.Framework.Assert.IsTrue("Error in read", cnt > 0);
offset += cnt;
length -= cnt;
}
// Verify
for (int i = 0; i < length; ++i)
{
byte actual = buffer[i];
byte expect = authenticData[(int)pos + i];
NUnit.Framework.Assert.AreEqual("Read data mismatch at file offset " + (pos + i)
+ ". Expects " + expect + "; got " + actual, actual, expect);
}
}
/// <exception cref="System.IO.IOException"/>
public virtual int Read(DFSInputStream dis, byte[] target, int startOff, int len)
{
int cnt = 0;
lock (dis)
{
dis.Seek(startOff);
while (cnt < len)
{
int read = dis.Read(target, cnt, len - cnt);
if (read == -1)
{
return read;
}
cnt += read;
}
}
return cnt;
}
/// <exception cref="System.IO.IOException"/>
public virtual int Read(DFSInputStream dis, byte[] target, int startOff, int len)
{
ByteBuffer bb = ByteBuffer.AllocateDirect(target.Length);
int cnt = 0;
lock (dis)
{
dis.Seek(startOff);
while (cnt < len)
{
int read = dis.Read(bb);
if (read == -1)
{
return read;
}
cnt += read;
}
}
bb.Clear();
bb.Get(target);
return cnt;
}