public static string DecompressToString(byte[] bytData)
{
byte[] bytDecompressedData = CompressionManager.Decompress(bytData);
string strData = ASCIIEncoding.ASCII.GetString(bytDecompressedData);
return(strData);
}
private void Refresh()
{
int intFileDataStartingIndex = 0;
CompressedFileRecord[] objRecords = new CompressedFileRecord[] { };
CompressedStream.Position = 0;
if (CompressedStream.Length > 0)
{
if (CompressedStream.Length < CompressedStreamSignature.Length)
{
throw new Exception("The stream does not represent a valid format.");
}
byte[] bytBuffer = new byte[CompressedStreamSignature.Length];
CompressedStream.Read(bytBuffer, 0, bytBuffer.Length);
for (int intIndex = 0; intIndex < bytBuffer.Length; intIndex++)
{
if (bytBuffer[intIndex] != CompressedStreamSignature[intIndex])
{
throw new Exception("The stream does not represent a valid format.");
}
}
bytBuffer = new byte[4];
CompressedStream.Read(bytBuffer, 0, 4);
int intRecordLength = BitConverter.ToInt32(bytBuffer, 0);
bytBuffer = new byte[intRecordLength];
CompressedStream.Read(bytBuffer, 0, intRecordLength);
intFileDataStartingIndex = (int)CompressedStream.Position;
byte[] bytRecordBytes = CompressionManager.Decompress(bytBuffer);
string strRecordData = ASCIIEncoding.ASCII.GetString(bytRecordBytes);
objRecords = CompressedFileRecordManager.FromString(strRecordData);
}
CompressedFileRecordManager = new CompressedFileRecordManager(intFileDataStartingIndex, objRecords, CompressedFileRecordState.Updated);
}
private void ExtractFile(CompressedFileRecord objRecord, CompressedFileRecordState enuRecordState, Stream objTargetStream)
{
if (enuRecordState == CompressedFileRecordState.Inserted)
{
using (FileStream objDiskFileStream = new FileStream(objRecord.OriginalFilePath, FileMode.Open, FileAccess.Read))
{
CompressionManager.CopyToStream(objDiskFileStream, objTargetStream);
}
}
else
{
int intFileStartIndex = CompressedFileRecordManager.FindFileStartIndex(objRecord);
if (intFileStartIndex == -1)
{
throw new FileNotFoundException("Unable to locate '" + objRecord.RelativeFilePath + "' within package.");
}
CompressedStream.Position = intFileStartIndex;
CompressionManager.Decompress(CompressedStream, objTargetStream, objRecord.Size);
}
}
