public virtual void TestVerifyChunkedSumsSuccess()
{
AllocateDirectByteBuffers();
FillDataAndValidChecksums();
NativeCrc32.VerifyChunkedSums(bytesPerChecksum, checksumType.id, checksums, data,
fileName, BasePosition);
}
public virtual void TestVerifyChunkedSumsFail()
{
AllocateDirectByteBuffers();
FillDataAndInvalidChecksums();
exception.Expect(typeof(ChecksumException));
NativeCrc32.VerifyChunkedSums(bytesPerChecksum, checksumType.id, checksums, data,
fileName, BasePosition);
}
/// <summary>Verify that the given checksums match the given data.</summary>
/// <remarks>
/// Verify that the given checksums match the given data.
/// The 'mark' of the ByteBuffer parameters may be modified by this function,.
/// but the position is maintained.
/// </remarks>
/// <param name="data">the DirectByteBuffer pointing to the data to verify.</param>
/// <param name="checksums">
/// the DirectByteBuffer pointing to a series of stored
/// checksums
/// </param>
/// <param name="fileName">the name of the file being read, for error-reporting</param>
/// <param name="basePos">the file position to which the start of 'data' corresponds</param>
/// <exception cref="Org.Apache.Hadoop.FS.ChecksumException">if the checksums do not match
/// </exception>
public virtual void VerifyChunkedSums(ByteBuffer data, ByteBuffer checksums, string
fileName, long basePos)
{
if (type.size == 0)
{
return;
}
if (data.HasArray() && checksums.HasArray())
{
VerifyChunkedSums(((byte[])data.Array()), data.ArrayOffset() + data.Position(), data
.Remaining(), ((byte[])checksums.Array()), checksums.ArrayOffset() + checksums.Position
(), fileName, basePos);
return;
}
if (NativeCrc32.IsAvailable())
{
NativeCrc32.VerifyChunkedSums(bytesPerChecksum, type.id, checksums, data, fileName
, basePos);
return;
}
int startDataPos = data.Position();
data.Mark();
checksums.Mark();
try
{
byte[] buf = new byte[bytesPerChecksum];
byte[] sum = new byte[type.size];
while (data.Remaining() > 0)
{
int n = Math.Min(data.Remaining(), bytesPerChecksum);
checksums.Get(sum);
data.Get(buf, 0, n);
summer.Reset();
summer.Update(buf, 0, n);
int calculated = (int)summer.GetValue();
int stored = (sum[0] << 24 & unchecked ((int)(0xff000000))) | (sum[1] << 16 & unchecked (
(int)(0xff0000))) | (sum[2] << 8 & unchecked ((int)(0xff00))) | sum[3] & unchecked (
(int)(0xff));
if (calculated != stored)
{
long errPos = basePos + data.Position() - startDataPos - n;
throw new ChecksumException("Checksum error: " + fileName + " at " + errPos + " exp: "
+ stored + " got: " + calculated, errPos);
}
}
}
finally
{
data.Reset();
checksums.Reset();
}
}
