/// <summary>
/// Uncompress a DEFLATE'd byte array into a single string.
/// </summary>
///
/// <seealso cref="DeflateStream.CompressString(String)">DeflateStream.CompressString(String)</seealso>
/// <seealso cref="DeflateStream.UncompressBuffer(byte[])">DeflateStream.UncompressBuffer(byte[])</seealso>
/// <seealso cref="GZipStream.UncompressString(byte[])">GZipStream.UncompressString(byte[])</seealso>
/// <seealso cref="ZlibStream.UncompressString(byte[])">ZlibStream.UncompressString(byte[])</seealso>
///
/// <param name="compressed">
/// A buffer containing DEFLATE-compressed data.
/// </param>
///
/// <returns>The uncompressed string</returns>
public static String UncompressString(byte[] compressed)
{
using (var input = new System.IO.MemoryStream(compressed))
{
System.IO.Stream decompressor =
new DeflateStream(input, CompressionMode.Decompress);
return ZlibBaseStream.UncompressString(compressed, decompressor);
}
}
public void LocalFileCheck()
{
if (FileStatus != ZipReturn.ZipUntested) return;
try
{
Stream sInput = null;
_zipFs.Seek((long)_dataLocation, SeekOrigin.Begin);
switch (_compressionMethod)
{
case 8:
sInput = new DeflateStream(_zipFs, CompressionMode.Decompress, true);
break;
case 0:
sInput = _zipFs;
break;
}
if (sInput == null)
{
FileStatus = ZipReturn.ZipErrorGettingDataStream;
return;
}
CRC32Hash crc32 = new CRC32Hash();
MD5 lmd5 = System.Security.Cryptography.MD5.Create();
SHA1 lsha1 = System.Security.Cryptography.SHA1.Create();
ulong sizetogo = UncompressedSize;
if (_buffer == null)
_buffer = new byte[Buffersize];
while (sizetogo > 0)
{
int sizenow = sizetogo > Buffersize ? Buffersize : (int)sizetogo;
sInput.Read(_buffer, 0, sizenow);
crc32.TransformBlock(_buffer, 0, sizenow, null, 0);
lmd5.TransformBlock(_buffer, 0, sizenow, null, 0);
lsha1.TransformBlock(_buffer, 0, sizenow, null, 0);
sizetogo = sizetogo - (ulong)sizenow;
}
crc32.TransformFinalBlock(_buffer, 0, 0);
lmd5.TransformFinalBlock(_buffer, 0, 0);
lsha1.TransformFinalBlock(_buffer, 0, 0);
byte[] testcrc = crc32.Hash;
md5 = lmd5.Hash;
sha1 = lsha1.Hash;
if (_compressionMethod == 8)
{
sInput.Close();
sInput.Dispose();
}
FileStatus = ByteArrCompare(CRC, testcrc) ? ZipReturn.ZipGood : ZipReturn.ZipCRCDecodeError;
}
catch
{
FileStatus = ZipReturn.ZipDecodeError;
}
}
/// <summary>
/// Compress a string into a byte array using DEFLATE (RFC 1951).
/// </summary>
///
/// <remarks>
/// Uncompress it with <see cref="DeflateStream.UncompressString(byte[])"/>.
/// </remarks>
///
/// <seealso cref="DeflateStream.UncompressString(byte[])">DeflateStream.UncompressString(byte[])</seealso>
/// <seealso cref="DeflateStream.CompressBuffer(byte[])">DeflateStream.CompressBuffer(byte[])</seealso>
/// <seealso cref="GZipStream.CompressString(string)">GZipStream.CompressString(string)</seealso>
/// <seealso cref="ZlibStream.CompressString(string)">ZlibStream.CompressString(string)</seealso>
///
/// <param name="s">
/// A string to compress. The string will first be encoded
/// using UTF8, then compressed.
/// </param>
///
/// <returns>The string in compressed form</returns>
public static byte[] CompressString(String s)
{
using (var ms = new System.IO.MemoryStream())
{
System.IO.Stream compressor =
new DeflateStream(ms, CompressionMode.Compress, CompressionLevel.BestCompression);
ZlibBaseStream.CompressString(s, compressor);
return ms.ToArray();
}
}
