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;
}
}
}
}
/// <summary>
/// Initialise a TarArchive for output.
/// </summary>
/// <param name="stream">The <see cref="TarOutputStream"/> to use for output.</param>
protected TarArchive(TarOutputStream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
tarOut = stream;
}
public void ValuesPreserved()
{
MemoryStream ms = new MemoryStream();
TarEntry entry;
DateTime modTime = DateTime.Now;
using (TarOutputStream tarOut = new TarOutputStream(ms))
{
entry = TarEntry.CreateTarEntry("TestEntry");
entry.GroupId = 12;
entry.UserId = 14;
entry.ModTime = modTime;
entry.UserName = "******";
entry.GroupName = "GroupName";
entry.TarHeader.Mode = 12345;
tarOut.PutNextEntry(entry);
}
MemoryStream ms2 = new MemoryStream();
ms2.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length);
ms2.Seek(0, SeekOrigin.Begin);
using (TarInputStream tarIn = new TarInputStream(ms2))
{
TarEntry nextEntry = tarIn.GetNextEntry();
Assert.AreEqual(entry.TarHeader.Checksum, nextEntry.TarHeader.Checksum, "Checksum");
Assert.IsTrue(nextEntry.Equals(entry), "Entries should be equal");
Assert.IsTrue(nextEntry.TarHeader.Equals(entry.TarHeader), "Headers should match");
// Tar only stores seconds
DateTime truncatedTime = new DateTime(modTime.Year, modTime.Month, modTime.Day,
modTime.Hour, modTime.Minute, modTime.Second);
Assert.AreEqual(truncatedTime, nextEntry.ModTime, "Modtimes should match");
int entryCount = 0;
while ( nextEntry != null )
{
++entryCount;
nextEntry = tarIn.GetNextEntry();
}
Assert.AreEqual(1, entryCount, "Expected 1 entry");
}
}
public void Checksum()
{
MemoryStream ms = new MemoryStream();
using ( TarOutputStream tarOut = new TarOutputStream(ms) )
{
DateTime modTime = DateTime.Now;
TarEntry entry = TarEntry.CreateTarEntry("TestEntry");
entry.TarHeader.Mode = 12345;
tarOut.PutNextEntry(entry);
}
MemoryStream ms2 = new MemoryStream();
ms2.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length);
ms2.Seek(0, SeekOrigin.Begin);
TarEntry nextEntry;
using (TarInputStream tarIn = new TarInputStream(ms2))
{
nextEntry = tarIn.GetNextEntry();
Assert.IsTrue(nextEntry.TarHeader.IsChecksumValid, "Checksum should be valid");
}
MemoryStream ms3 = new MemoryStream();
ms3.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length);
ms3.Seek(0, SeekOrigin.Begin);
ms3.Write(new byte[1] { 34 }, 0, 1);
ms3.Seek(0, SeekOrigin.Begin);
using (TarInputStream tarIn = new TarInputStream(ms3))
{
bool trapped = false;
try
{
nextEntry = tarIn.GetNextEntry();
}
catch (TarException)
{
trapped = true;
}
Assert.IsTrue(trapped, "Checksum should be invalid");
}
}
void TryLongName(string name)
{
MemoryStream ms = new MemoryStream();
using ( TarOutputStream tarOut = new TarOutputStream(ms) )
{
DateTime modTime = DateTime.Now;
TarEntry entry = TarEntry.CreateTarEntry(name);
tarOut.PutNextEntry(entry);
}
MemoryStream ms2 = new MemoryStream();
ms2.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length);
ms2.Seek(0, SeekOrigin.Begin);
using (TarInputStream tarIn = new TarInputStream(ms2))
{
TarEntry nextEntry = tarIn.GetNextEntry();
Assert.AreEqual(nextEntry.Name, name, "Name match failure");
}
}
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;
}
}
}
}
/// <summary>
/// Initialise a TarArchive for output.
/// </summary>
/// <param name="stream">The <see cref="TarOutputStream"/> to use for output.</param>
protected TarArchive(TarOutputStream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
tarOut = stream;
}