/// <summary>
/// Read data descriptor at the end of compressed data.
/// </summary>
/// <param name="blubb64">if set to <c>true</c> [blubb64].</param>
/// <param name="data">The data to fill in.</param>
/// <returns>Returns the number of bytes read in the descriptor.</returns>
public void ReadDataDescriptor(bool blubb64, DescriptorData data)
{
int intValue = ReadLEInt();
// In theory this may not be a descriptor according to PKZIP appnote.
// In practise its always there.
if (intValue != BlubbZipConstants.DataDescriptorSignature)
{
throw new BlubbZipException("Data descriptor signature not found");
}
data.Crc = ReadLEInt();
if (blubb64)
{
data.CompressedSize = ReadLELong();
data.Size = ReadLELong();
}
else
{
data.CompressedSize = ReadLEInt();
data.Size = ReadLEInt();
}
}
/// <summary>
/// Test an archive for integrity/validity
/// </summary>
/// <param name="testData">Perform low level data Crc check</param>
/// <param name="strategy">The <see cref="TestStrategy"></see> to apply.</param>
/// <param name="resultHandler">The <see cref="BlubbTestResultHandler"></see> handler to call during testing.</param>
/// <returns>true if all tests pass, false otherwise</returns>
/// <exception cref="ObjectDisposedException">The object has already been closed.</exception>
public bool TestArchive( bool testData, TestStrategy strategy, BlubbTestResultHandler resultHandler ) {
if( isDisposed_ ) {
throw new ObjectDisposedException( "BlubbFile" );
}
TestStatus status = new TestStatus( this );
if( resultHandler != null ) {
resultHandler( status, null );
}
HeaderTest test = testData ? ( HeaderTest.Header | HeaderTest.Extract ) : HeaderTest.Header;
bool testing = true;
try {
int entryIndex = 0;
while( testing && ( entryIndex < Count ) ) {
if( resultHandler != null ) {
status.SetEntry( this[ entryIndex ] );
status.SetOperation( TestOperation.EntryHeader );
resultHandler( status, null );
}
try {
TestLocalHeader( this[ entryIndex ], test );
} catch( BlubbZipException ex ) {
status.AddError();
if( resultHandler != null ) {
resultHandler( status,
string.Format( "Exception during test - '{0}'", ex.Message ) );
}
if( strategy == TestStrategy.FindFirstError ) {
testing = false;
}
}
if( testing && testData && this[ entryIndex ].IsFile ) {
if( resultHandler != null ) {
status.SetOperation( TestOperation.EntryData );
resultHandler( status, null );
}
Crc32 crc = new Crc32();
using( Stream entryStream = this.GetInputStream( this[ entryIndex ] ) ) {
byte[] buffer = new byte[ 4096 ];
long totalBytes = 0;
int bytesRead;
while( ( bytesRead = entryStream.Read( buffer, 0, buffer.Length ) ) > 0 ) {
crc.Update( buffer, 0, bytesRead );
if( resultHandler != null ) {
totalBytes += bytesRead;
status.SetBytesTested( totalBytes );
resultHandler( status, null );
}
}
}
if( this[ entryIndex ].Crc != crc.Value ) {
status.AddError();
if( resultHandler != null ) {
resultHandler( status, "CRC mismatch" );
}
if( strategy == TestStrategy.FindFirstError ) {
testing = false;
}
}
if( ( this[ entryIndex ].Flags & (int)GeneralBitFlags.Descriptor ) != 0 ) {
BlubbZipHelperStream helper = new BlubbZipHelperStream( baseStream_ );
DescriptorData data = new DescriptorData();
helper.ReadDataDescriptor( this[ entryIndex ].LocalHeaderRequiresBlubb64, data );
if( this[ entryIndex ].Crc != data.Crc ) {
status.AddError();
}
if( this[ entryIndex ].CompressedSize != data.CompressedSize ) {
status.AddError();
}
if( this[ entryIndex ].Size != data.Size ) {
status.AddError();
}
}
}
if( resultHandler != null ) {
status.SetOperation( TestOperation.EntryComplete );
resultHandler( status, null );
}
entryIndex += 1;
}
if( resultHandler != null ) {
status.SetOperation( TestOperation.MiscellaneousTests );
resultHandler( status, null );
}
// TODO: the 'Corrina Johns' test where local headers are missing from
// the central directory. They are therefore invisible to many archivers.
} catch( Exception ex ) {
status.AddError();
if( resultHandler != null ) {
resultHandler( status, string.Format( "Exception during test - '{0}'", ex.Message ) );
}
}
if( resultHandler != null ) {
status.SetOperation( TestOperation.Complete );
status.SetEntry( null );
resultHandler( status, null );
}
return ( status.ErrorCount == 0 );
}
/// <summary>
/// Read data descriptor at the end of compressed data.
/// </summary>
/// <param name="blubb64">if set to <c>true</c> [blubb64].</param>
/// <param name="data">The data to fill in.</param>
/// <returns>Returns the number of bytes read in the descriptor.</returns>
public void ReadDataDescriptor( bool blubb64, DescriptorData data ) {
int intValue = ReadLEInt();
// In theory this may not be a descriptor according to PKZIP appnote.
// In practise its always there.
if( intValue != BlubbZipConstants.DataDescriptorSignature ) {
throw new BlubbZipException( "Data descriptor signature not found" );
}
data.Crc = ReadLEInt();
if( blubb64 ) {
data.CompressedSize = ReadLELong();
data.Size = ReadLELong();
} else {
data.CompressedSize = ReadLEInt();
data.Size = ReadLEInt();
}
}
