public void BlockFactorHandling()
{
const int MinimumBlockFactor = 1;
const int MaximumBlockFactor = 64;
const int FillFactor = 2;
for ( int factor = MinimumBlockFactor; factor < MaximumBlockFactor; ++factor)
{
MemoryStream ms = new MemoryStream();
using ( TarOutputStream tarOut = new TarOutputStream(ms, factor) )
{
TarEntry entry = TarEntry.CreateTarEntry("TestEntry");
entry.Size = (TarBuffer.BlockSize * factor * FillFactor);
tarOut.PutNextEntry(entry);
byte[] buffer = new byte[TarBuffer.BlockSize];
Random r = new Random();
r.NextBytes(buffer);
// Last block is a partial one
for ( int i = 0; i < factor * FillFactor; ++i)
{
tarOut.Write(buffer, 0, buffer.Length);
}
}
byte[] tarData = ms.ToArray();
Assert.IsNotNull(tarData, "Data written is null");
// Blocks = Header + Data Blocks + Zero block + Record trailer
int usedBlocks = 1 + (factor * FillFactor) + 1;
int totalBlocks = usedBlocks + (factor - 1);
totalBlocks /= factor;
totalBlocks *= factor;
Assert.AreEqual(TarBuffer.BlockSize * totalBlocks, tarData.Length, "Tar file should contain {0} blocks in length",
totalBlocks);
if ( usedBlocks < totalBlocks )
{
// Start at first byte after header.
int byteIndex = TarBuffer.BlockSize * ((factor * FillFactor)+ 1);
while ( byteIndex < tarData.Length )
{
int blockNumber = byteIndex / TarBuffer.BlockSize;
int offset = blockNumber % TarBuffer.BlockSize;
Assert.AreEqual(0, tarData[byteIndex],
string.Format("Trailing block data should be null iteration {0} block {1} offset {2} index {3}",
factor,
blockNumber, offset, byteIndex));
byteIndex += 1;
}
}
}
}
public void TrailerContainsNulls()
{
const int TestBlockFactor = 3;
for ( int iteration = 0; iteration < TestBlockFactor * 2; ++iteration)
{
MemoryStream ms = new MemoryStream();
using ( TarOutputStream tarOut = new TarOutputStream(ms, TestBlockFactor) )
{
TarEntry entry = TarEntry.CreateTarEntry("TestEntry");
if ( iteration > 0 )
{
entry.Size = (TarBuffer.BlockSize * (iteration - 1)) + 9;
}
tarOut.PutNextEntry(entry);
byte[] buffer = new byte[TarBuffer.BlockSize];
Random r = new Random();
r.NextBytes(buffer);
if ( iteration > 0 )
{
for ( int i = 0; i < iteration - 1; ++i )
{
tarOut.Write(buffer, 0, buffer.Length);
}
// Last block is a partial one
for ( int i = 1; i < 10; ++i)
{
tarOut.WriteByte((byte)i);
}
}
}
byte[] tarData = ms.ToArray();
Assert.IsNotNull(tarData, "Data written is null");
// Blocks = Header + Data Blocks + Zero block + Record trailer
int usedBlocks = 1 + iteration + 1;
int totalBlocks = usedBlocks + (TestBlockFactor - 1);
totalBlocks /= TestBlockFactor;
totalBlocks *= TestBlockFactor;
Assert.AreEqual(TarBuffer.BlockSize * totalBlocks, tarData.Length,
string.Format("Tar file should be {0} blocks in length", totalBlocks));
if ( usedBlocks < totalBlocks )
{
// Start at first byte after header.
int byteIndex = TarBuffer.BlockSize * (iteration + 1);
while ( byteIndex < tarData.Length )
{
int blockNumber = byteIndex / TarBuffer.BlockSize;
int offset = blockNumber % TarBuffer.BlockSize;
Assert.AreEqual(0, tarData[byteIndex],
string.Format("Trailing block data should be null iteration {0} block {1} offset {2} index {3}",
iteration,
blockNumber, offset, byteIndex));
byteIndex += 1;
}
}
}
}
