/// <summary>
/// 字节数组压缩
/// 返回：已压缩的字节数组
/// </summary>
/// <param name="data">待压缩的字节数组</param>
/// <returns></returns>
public static byte[] CompressBytes(byte[] data)
{
var f = new ICSharpCode.SharpZipLib.Zip.Compression.Deflater(ICSharpCode.SharpZipLib.Zip.Compression
.Deflater.BEST_COMPRESSION);
f.SetInput(data);
f.Finish();
var o = new MemoryStream(data.Length);
try
{
var buf = new byte[1024];
while (!f.IsFinished)
{
var got = f.Deflate(buf);
o.Write(buf, 0, got);
}
}
finally
{
o.Close();
}
return(o.ToArray());
}
/// <summary>
/// Compress the input data to an output stream. The first four bytes
/// is a UInt32 (in LSB format) that contains the size of the *decompressed*
/// data.
/// </summary>
/// <param name="inputData">An array of bytes to compress</param>
/// <param name="nNumInputBytes">The number of input bytes from inputData to compress</param>
/// <param name="outStream">The stream to write the compressed bytes to.</param>
/// <returns>The length of the compressed data (not including the length value
/// that is written to the beginning of the stream)</returns>
public static int Compress(byte[] inputData, int nNumInputBytes, Stream outStream)
{
if (inputData.Length == 0 || nNumInputBytes == 0)
{
throw new InvalidDataException("ZLib.Compress: No input data to compress.");
}
long nMaxCompressedDataLen = nNumInputBytes + ((nNumInputBytes / 1000) + 1) + 12 + sizeof(int);
byte[] outBuff = new byte[nMaxCompressedDataLen];
ICSharpCode.SharpZipLib.Zip.Compression.Deflater compresser =
new ICSharpCode.SharpZipLib.Zip.Compression.Deflater();
compresser.SetInput(inputData);
compresser.Finish();
int nCompressedDataLength = compresser.Deflate(outBuff);
BinaryWriter writer = new BinaryWriter(outStream);
writer.Write(nNumInputBytes);
writer.Write(outBuff, 0, nCompressedDataLength);
writer.Flush();
return(nCompressedDataLength);
}
public LegacyBBeBObject CreateLegacyTextObject()
{
m_PageBuffer.putTag(TagId.EndPage);
byte[] output = m_PageBuffer.GetBuffer();
ObjectFlags flags = 0;
int len = (int)m_PageBuffer.Position;
if (len > k_MinUncompressedLen)
{
// Allocate a buffer to compress into
output = new byte[len];
// Stash uncompressed size
ByteBuffer.PackInt(output, 0, len);
// Deflate text
ICSharpCode.SharpZipLib.Zip.Compression.Deflater compresser =
new ICSharpCode.SharpZipLib.Zip.Compression.Deflater();
compresser.SetInput(m_PageBuffer.GetBuffer(), 0, len);
compresser.Finish();
len = compresser.Deflate(output, 4, output.Length - 4) + 4;
flags = ObjectFlags.COMPRESSED;
}
return(new LegacyBBeBObject(m_Book, ObjectType.Text, flags, output, len));
}
public static byte[] LowLevelCompress(byte[] bytes, Shell.EndianFormat byteOrder)
{
Contract.Requires <ArgumentNullException>(bytes != null);
Contract.Ensures(Contract.Result <byte[]>() != null);
byte[] result = new byte[sizeof(int)];
// Setup the decompressed size header
byte[] size_bytes = BitConverter.GetBytes(bytes.Length);
if (!byteOrder.IsSameAsRuntime())
{
Bitwise.ByteSwap.SwapInt32(size_bytes, 0);
}
Array.Copy(size_bytes, result, size_bytes.Length);
var zip = new ICSharpCode.SharpZipLib.Zip.Compression.Deflater(
ICSharpCode.SharpZipLib.Zip.Compression.Deflater.BEST_COMPRESSION, false);
{
zip.SetInput(bytes);
zip.Finish();
byte[] temp = new byte[bytes.Length];
int compressed_size = zip.Deflate(temp);
Contract.Assert(compressed_size <= bytes.Length);
Array.Resize(ref result, sizeof(int) + compressed_size);
Array.Copy(temp, 0, result, sizeof(int), compressed_size);
}
return(result);
}
private void CompresNowZip()
{
ICSharpCode.SharpZipLib.Zip.Compression.Deflater def =
new ICSharpCode.SharpZipLib.Zip.Compression.Deflater(
ICSharpCode.SharpZipLib.Zip.Compression.Deflater.BEST_COMPRESSION, true);
Stream aux = new MemoryStream();
byte[] data = new byte[this.m_streaminput.Length]; //minimo el tamaño sin comprimir.
int size = 0;
try
{
def.SetInput(this.m_byteinput);
def.Finish();
size = def.Deflate(data);
if (size == 0)
{
while (def.IsFinished == false)
{
if (def.IsNeedingInput)
{
Exception e = new Exception("Tamaño muy pequeño para comprimir");
break;
}
else
{
size = def.Deflate(data);
System.Threading.Thread.Sleep(2000);
}
}
}
def.Flush();
}
catch (ZipException e)
{
this.m_byteoutput = null;
this.m_streamoutput = null;
Debug.WriteLine(e.Message);
}
catch (Exception e)
{
this.m_byteoutput = null;
this.m_streamoutput = null;
Debug.WriteLine(e.Message);
}
finally
{
this.m_byteoutput = null;
this.m_byteoutput = new byte[size];
this.m_streamoutput = new MemoryStream(size);
this.m_streamoutput.Write(data, 0, size);
this.m_streamoutput.Seek(0, SeekOrigin.Begin);
this.m_streamoutput.Read(this.m_byteoutput, 0, size);
this.m_streamoutput.Seek(0, SeekOrigin.Begin);
}
}
/// <summary>
/// deflater压缩
/// </summary>
/// <param name="inputByte"></param>
/// <returns></returns>
public static byte[] deflater(byte[] inputByte)
{
byte[] temp = new byte[1024];
MemoryStream memory = new MemoryStream();
ICSharpCode.SharpZipLib.Zip.Compression.Deflater def = new ICSharpCode.SharpZipLib.Zip.Compression.Deflater();
def.SetInput(inputByte);
def.Finish();
while (!def.IsFinished)
{
int extracted = def.Deflate(temp);
if (extracted > 0)
{
memory.Write(temp, 0, extracted);
}
else
{
break;
}
}
return memory.ToArray();
}
/// <summary>
/// deflater压缩
/// </summary>
/// <param name="inputByte"></param>
/// <returns></returns>
public static byte[] deflater(byte[] inputByte)
{
byte[] temp = new byte[1024];
MemoryStream memory = new MemoryStream();
ICSharpCode.SharpZipLib.Zip.Compression.Deflater def = new ICSharpCode.SharpZipLib.Zip.Compression.Deflater();
def.SetInput(inputByte);
def.Finish();
while (!def.IsFinished)
{
int extracted = def.Deflate(temp);
if (extracted > 0)
{
memory.Write(temp, 0, extracted);
}
else
{
break;
}
}
return(memory.ToArray());
}
public static byte[] LowLevelCompress(byte[] bytes, int level,
out uint adler, byte[] compressedBytes,
bool trimCompressedBytes = true, bool noZlibHeaderOrFooter = true)
{
int compressed_size;
var zip = new ICSharpCode.SharpZipLib.Zip.Compression.Deflater(level, noZlibHeaderOrFooter);
{
zip.SetInput(bytes);
zip.Finish();
compressed_size = zip.Deflate(compressedBytes);
adler = (uint)zip.Adler;
if (trimCompressedBytes)
{
byte[] cmp_data = compressedBytes;
Array.Resize(ref cmp_data, compressed_size);
compressedBytes = cmp_data;
}
}
return(compressedBytes);
}
private void CompresNowZip()
{
ICSharpCode.SharpZipLib.Zip.Compression.Deflater def =
new ICSharpCode.SharpZipLib.Zip.Compression.Deflater(
ICSharpCode.SharpZipLib.Zip.Compression.Deflater.BEST_COMPRESSION, true);
Stream aux = new MemoryStream();
byte[] data = new byte[this.m_streaminput.Length]; //minimo el tamaño sin comprimir.
int size = 0;
try
{
def.SetInput(this.m_byteinput);
def.Finish();
size = def.Deflate(data);
if (size == 0)
while (def.IsFinished == false)
{
if (def.IsNeedingInput)
{
Exception e = new Exception("Tamaño muy pequeño para comprimir");
break;
}
else
{
size = def.Deflate(data);
System.Threading.Thread.Sleep(2000);
}
}
def.Flush();
}
catch (ZipException e)
{
this.m_byteoutput = null;
this.m_streamoutput = null;
Debug.WriteLine(e.Message);
}
catch (Exception e)
{
this.m_byteoutput = null;
this.m_streamoutput = null;
Debug.WriteLine(e.Message);
}
finally
{
this.m_byteoutput = null;
this.m_byteoutput = new byte[size];
this.m_streamoutput = new MemoryStream(size);
this.m_streamoutput.Write(data, 0, size);
this.m_streamoutput.Seek(0, SeekOrigin.Begin);
this.m_streamoutput.Read(this.m_byteoutput, 0, size);
this.m_streamoutput.Seek(0, SeekOrigin.Begin);
}
}