int ExtractAndCrc(Stream archiveStream, Stream targetOutput,
short compressionMethod,
long compressedFileDataSize,
long uncompressedSize)
{
int crcResult;
var input = archiveStream;
// change for workitem 8098
input.Seek(FileDataPosition, SeekOrigin.Begin);
var bytes = new byte[BufferSize];
// The extraction process varies depending on how the entry was
// stored. It could have been encrypted, and it coould have
// been compressed, or both, or neither. So we need to check
// both the encryption flag and the compression flag, and take
// the proper action in all cases.
var leftToRead = (compressionMethod != (short)CompressionMethod.None)
? uncompressedSize
: compressedFileDataSize;
// Get a stream that either decrypts or not.
_inputDecryptorStream = GetExtractDecryptor(input);
var input3 = GetExtractDecompressor( _inputDecryptorStream );
var bytesWritten = 0L;
// As we read, we maybe decrypt, and then we maybe decompress. Then we write.
using (var s1 = new Crc.CrcCalculatorStream(input3))
{
while (leftToRead > 0)
{
//Console.WriteLine("ExtractOne: LeftToRead {0}", LeftToRead);
// Casting LeftToRead down to an int is ok here in the else clause,
// because that only happens when it is less than bytes.Length,
// which is much less than MAX_INT.
int len = (leftToRead > bytes.Length) ? bytes.Length : (int)leftToRead;
int n = s1.Read(bytes, 0, len);
// must check data read - essential for detecting corrupt zip files
_CheckRead(n);
targetOutput.Write(bytes, 0, n);
leftToRead -= n;
bytesWritten += n;
if (_ioOperationCanceled)
break;
}
crcResult = s1.Crc;
}
return crcResult;
}
int ExtractAndCrc(Stream archiveStream, Stream targetOutput,
short compressionMethod,
long compressedFileDataSize,
long uncompressedSize)
{
int crcResult;
var input = archiveStream;
// change for workitem 8098
input.Seek(FileDataPosition, SeekOrigin.Begin);
// workitem 10178
Ionic.Zip.SharedUtilities.Workaround_Ladybug318918(input);
var bytes = new byte[BufferSize];
// The extraction process varies depending on how the entry was
// stored. It could have been encrypted, and it coould have
// been compressed, or both, or neither. So we need to check
// both the encryption flag and the compression flag, and take
// the proper action in all cases.
var leftToRead = (compressionMethod != (short)CompressionMethod.None)
? uncompressedSize
: compressedFileDataSize;
// Get a stream that either decrypts or not.
_inputDecryptorStream = GetExtractDecryptor(input);
var input3 = GetExtractDecompressor(_inputDecryptorStream);
var bytesWritten = 0L;
// As we read, we maybe decrypt, and then we maybe decompress. Then we write.
using (var s1 = new Crc.CrcCalculatorStream(input3))
{
while (leftToRead > 0)
{
//Console.WriteLine("ExtractOne: LeftToRead {0}", LeftToRead);
// Casting LeftToRead down to an int is ok here in the else clause,
// because that only happens when it is less than bytes.Length,
// which is much less than MAX_INT.
int len = (leftToRead > bytes.Length) ? bytes.Length : (int)leftToRead;
int n = s1.Read(bytes, 0, len);
// must check data read - essential for detecting corrupt zip files
_CheckRead(n);
targetOutput.Write(bytes, 0, n);
leftToRead -= n;
bytesWritten += n;
// fire the progress event, check for cancels
OnExtractProgress(bytesWritten, uncompressedSize);
if (_ioOperationCanceled)
break;
}
crcResult = s1.Crc;
}
return crcResult;
}
