internal Harness(DataChecksum checksum, int dataLength, bool useDirect)
{
this.checksum = checksum;
this.dataLength = dataLength;
numSums = (dataLength - 1) / checksum.GetBytesPerChecksum() + 1;
sumsLength = numSums * checksum.GetChecksumSize();
byte[] data = new byte[dataLength + DataOffsetInBuffer + DataTrailerInBuffer];
new Random().NextBytes(data);
dataBuf = ByteBuffer.Wrap(data, DataOffsetInBuffer, dataLength);
byte[] checksums = new byte[SumsOffsetInBuffer + sumsLength];
checksumBuf = ByteBuffer.Wrap(checksums, SumsOffsetInBuffer, sumsLength);
// Swap out for direct buffers if requested.
if (useDirect)
{
dataBuf = Directify(dataBuf);
checksumBuf = Directify(checksumBuf);
}
}
/// <exception cref="Org.Apache.Hadoop.FS.ChecksumException"/>
internal virtual void TestCorrectness()
{
// calculate real checksum, make sure it passes
checksum.CalculateChunkedSums(dataBuf, checksumBuf);
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
// Change a byte in the header and in the trailer, make sure
// it doesn't affect checksum result
CorruptBufferOffset(checksumBuf, 0);
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
CorruptBufferOffset(dataBuf, 0);
dataBuf.Limit(dataBuf.Limit() + 1);
CorruptBufferOffset(dataBuf, dataLength + DataOffsetInBuffer);
dataBuf.Limit(dataBuf.Limit() - 1);
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
// Make sure bad checksums fail - error at beginning of array
CorruptBufferOffset(checksumBuf, SumsOffsetInBuffer);
try
{
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
NUnit.Framework.Assert.Fail("Did not throw on bad checksums");
}
catch (ChecksumException ce)
{
Assert.Equal(0, ce.GetPos());
}
// Make sure bad checksums fail - error at end of array
UncorruptBufferOffset(checksumBuf, SumsOffsetInBuffer);
CorruptBufferOffset(checksumBuf, SumsOffsetInBuffer + sumsLength - 1);
try
{
checksum.VerifyChunkedSums(dataBuf, checksumBuf, "fake file", 0);
NUnit.Framework.Assert.Fail("Did not throw on bad checksums");
}
catch (ChecksumException ce)
{
int expectedPos = checksum.GetBytesPerChecksum() * (numSums - 1);
Assert.Equal(expectedPos, ce.GetPos());
Assert.True(ce.Message.Contains("fake file"));
}
}