/**
* Generate an object that contains an CMS Compressed Data
*/
public CmsCompressedData Generate(
CmsProcessable content,
string compressionOid)
{
AlgorithmIdentifier comAlgId;
Asn1OctetString comOcts;
try
{
MemoryStream bOut = new MemoryStream();
ZOutputStream zOut = new ZOutputStream(bOut, JZlib.Z_DEFAULT_COMPRESSION);
content.Write(zOut);
zOut.Dispose();
comAlgId = new AlgorithmIdentifier(new DerObjectIdentifier(compressionOid));
comOcts = new BerOctetString(bOut.ToArray());
}
catch (IOException e)
{
throw new CmsException("exception encoding data.", e);
}
ContentInfo comContent = new ContentInfo(CmsObjectIdentifiers.Data, comOcts);
ContentInfo contentInfo = new ContentInfo(
CmsObjectIdentifiers.CompressedData,
new CompressedData(comAlgId, comContent));
return(new CmsCompressedData(contentInfo));
}
/// <summary>
/// Old Decompress method not using .NET compressor
/// </summary>
/// <param name="Data"></param>
/// <returns></returns>
public byte[] DecompressOld(byte[] Data)
{
byte[] decompressedPixelData = new byte[UncompressedLength];
// ZLIB
if (version > BgfFile.VERSION9)
{
// init streams
MemoryStream destStream = new MemoryStream(decompressedPixelData, true);
ZOutputStream destZ = new ZOutputStream(destStream);
// decompress
destZ.Write(Data, 0, Data.Length);
destZ.Flush();
destZ.finish();
// cleanup
destStream.Dispose();
destZ.Dispose();
}
// CRUSH
else
{
#if WINCLR && X86
// decompress
Crush32.Decompress(Data, 0, decompressedPixelData, 0, (int)UncompressedLength, CompressedLength);
#else
throw new Exception(ERRORCRUSHPLATFORM);
#endif
}
// set decompressed array to pixeldata
return(decompressedPixelData);
}
public static byte[] Compress(bool isCompress, byte[] input, int idxBg, int length)
{
byte[] ret = null;
try
{
if (isCompress)//压缩
{
using (MemoryStream memoryStream = new MemoryStream())
{
ZOutputStream zos = new ZOutputStream(memoryStream, zlibConst.Z_DEFAULT_COMPRESSION);
zos.Write(input, idxBg, length);
zos.Dispose();
ret = memoryStream.ToArray();
memoryStream.Flush();
}
}
else
{
using (MemoryStream memoryStream = new MemoryStream())
{
ZOutputStream zos = new ZOutputStream(memoryStream);
//解压缩时间，调用Write_NoException，防止攻击
if (!zos.Write_NoException(input, idxBg, length))
{
zos.Dispose();
return(null);
}
zos.Dispose();
ret = memoryStream.ToArray();
memoryStream.Flush();
}
}
}
catch (Exception)
{
//LogEngine.Write(LOGTYPE.ERROR, ex.ToString());
ret = null;
}
return(ret);
}
public void Dispose()
{
if (_ZOutStream != null)
{
_ZOutStream.Dispose();
}
if (fos != null)
{
fos.Dispose();
}
}
protected override void Dispose(bool disposing)
{
_out.Dispose();
// TODO Parent context(s) should really be be closed explicitly
_eiGen.Close();
_cGen.Close();
_sGen.Close();
base.Dispose(disposing);
}
/// <summary>
/// Returns a compressed byte[] of PixelData argument
/// </summary>
/// <param name="Data"></param>
/// <returns></returns>
public byte[] Compress(byte[] Data)
{
// allocate a buffer with uncompressed length to write compressed stream to
byte[] tempBuffer = new byte[UncompressedLength];
int compressedLength;
// ZLIB
if (version > BgfFile.VERSION9)
{
// init streams
MemoryStream destStream = new MemoryStream(tempBuffer, true);
ZOutputStream destZ = new ZOutputStream(destStream, zlibConst.Z_BEST_COMPRESSION);
// compress
destZ.Write(Data, 0, Data.Length);
destZ.Flush();
destZ.finish();
// update compressed length
compressedLength = (int)destZ.TotalOut;
// cleanup
destStream.Dispose();
destZ.Dispose();
}
// CRUSH
else
{
#if WINCLR && X86
// compress to tempBuffer
compressedLength = Crush32.Compress(Data, 0, tempBuffer, 0, (int)UncompressedLength);
#else
throw new Exception(ERRORCRUSHPLATFORM);
#endif
}
// copy all bytes we actually used from tempBuffer to new PixelData
byte[] newPixelData = new byte[compressedLength];
Array.Copy(tempBuffer, 0, newPixelData, 0, compressedLength);
return(newPixelData);
}
protected override void Dispose(bool disposing)
{
try
{
if (!disposing)
{
return;
}
_out.Dispose();
// TODO Parent context(s) should really be be closed explicitly
_eiGen.Close();
_cGen.Close();
_sGen.Close();
}
finally
{
base.Dispose(disposing);
}
}
