| public Write ( byte array, int offset, int count ) : void | ||
| array | byte | |
| offset | int | |
| count | int | |
| Результат | void | |
public void CompressTest()
{
var s = "StartTime:13.4.201213:15:26;RunTime:00:01:24";
var ms = new MemoryStream();
var ds = new DeflateStream(ms, CompressionMode.Compress);
var encoding = System.Text.Encoding.UTF8;
var byteData = encoding.GetBytes(s);
Trace.WriteLine("original : {0}", s);
ds.Write(byteData, 0, byteData.Length);
ds.Close();
byte[] compressed = ms.ToArray();
Trace.WriteLine("compressed : {0}", System.Convert.ToBase64String(compressed));
ms = new MemoryStream(compressed);
ds = new DeflateStream(ms, CompressionMode.Decompress);
compressed = new byte[compressed.Length + 100];
var offset = 0;
while (true)
{
int bytesRead = ds.Read(compressed, offset, 1);
if (bytesRead == 0) { break; }
offset += bytesRead;
}
ds.Close();
string uncompressed = encoding.GetString(compressed);
Trace.WriteLine("uncompressed: {0}\n", uncompressed);
}
public static byte[] Compress(byte[] buffer)
{
byte[] comp;
using (var output = new MemoryStream()) {
using (var deflate = new DeflateStream(output, CompressionMode.Compress))
deflate.Write(buffer, 0, buffer.Length);
comp = output.ToArray();
}
// Refer to http://www.ietf.org/rfc/rfc1950.txt for zlib format
const byte CM = 8;
const byte CINFO = 7;
const byte CMF = CM | (CINFO << 4);
const byte FLG = 0xDA;
byte[] result = new byte[comp.Length + 6];
result[0] = CMF;
result[1] = FLG;
Buffer.BlockCopy(comp, 0, result, 2, comp.Length);
uint cksum = ADLER32(buffer);
var index = result.Length - 4;
result[index++] = (byte)(cksum >> 24);
result[index++] = (byte)(cksum >> 16);
result[index++] = (byte)(cksum >> 8);
result[index++] = (byte)(cksum >> 0);
return result;
}
public static byte[] Compress(string data)
{
byte[] input = Encoding.ASCII.GetBytes(data);
MemoryStream ms = new MemoryStream();
DeflateStream zipper = new DeflateStream(ms, CompressionMode.Compress, true);
zipper.Write(input, 0, input.Length);
zipper.Close();
byte[] output;
if (ms.Length < input.Length)
{
output = new byte[ms.Length + 8];
SetLength(input.Length, output, 0);
SetLength((int)ms.Length, output, 4);
ms.Position = 0;
ms.Read(output, 8, output.Length - 8);
}
else
{
output = new byte[input.Length + 8];
SetLength(input.Length, output, 0);
SetLength(input.Length, output, 4);
input.CopyTo(output, 8);
}
return output;
}
/// <summary>
/// ѹËõ¶þ½øÖÆÁ÷
/// </summary>
/// <param name="stream">´ýѹËõµÄ¶þ½øÖÆÁ÷</param>
/// <returns>·µ»ØѹËõºóµÄ¶þ½øÖÆÁ÷</returns>
/// <remarks>
/// ѹËõ¶þ½øÖÆÁ÷£ºÍ¨¹ýCreateTempFile()Éú³ÉÁÙʱÎļþ£»Éú³É´ýѹËõµÄ¶þ½øÖÆÁ÷inStream£»·µ»ØѹËõºóµÄ¶þ½øÖÆÁ÷outStream£»
/// <code source="..\Framework\TestProjects\DeluxeWorks.Library.Test\Compression\GenericZipTest.cs" region="StreamZipTest" lang="cs" title="ѹËõ¶þ½øÖÆÁ÷" />
/// </remarks>
public static Stream ZipStream(Stream stream)
{
if (false == PreCheck(stream))
return null;
#region compress stream by buffers
MemoryStream result = new MemoryStream();
Byte[] buff = new Byte[BufferSize];
using (DeflateStream compressStream = new DeflateStream(result, CompressionMode.Compress, true))
{
int cnt = stream.Read(buff, 0, BufferSize);
while (cnt > 0)
{
compressStream.Write(buff, 0, cnt);
cnt = stream.Read(buff, 0, BufferSize);
}
}
#endregion
return result;
}
public void Compress(ref byte[] buffer, ref int length)
{
using (var outS = new MemoryStream())
{
using (var ds = new DeflateStream(outS, CompressionMode.Compress, true))
{
ds.Write(buffer, 0, length);
}
outS.Position = 0;
// Recycle the buffer?
if (outS.Length <= buffer.Length)
{
length = outS.Read(buffer, 0, buffer.Length);
// Heartbleed: Nope; zero-fill the remaining buffer!
for (var i = length; i < buffer.Length; i++)
{
buffer[i] = 0;
}
}
else
{
buffer = outS.ToArray();
length = buffer.Length;
}
}
}
/// <summary>
/// 지정된 데이타를 압축한다.
/// </summary>
/// <param name="input">압축할 Data</param>
/// <returns>압축된 Data</returns>
public override byte[] Compress(byte[] input) {
if(IsDebugEnabled)
log.Debug(CompressorTool.SR.CompressStartMsg);
// check input data
if(input.IsZeroLength()) {
if(IsDebugEnabled)
log.Debug(CompressorTool.SR.InvalidInputDataMsg);
return CompressorTool.EmptyBytes;
}
byte[] output;
using(var outStream = new MemoryStream()) {
using(var deflate = new DeflateStream(outStream, CompressionMode.Compress)) {
deflate.Write(input, 0, input.Length);
}
output = outStream.ToArray();
}
if(IsDebugEnabled)
log.Debug(CompressorTool.SR.CompressResultMsg, input.Length, output.Length, output.Length / (double)input.Length);
return output;
}
private string GetEncodedReportFile()
{
string report = null;
try {
string exePath = Application.ExecutablePath;
string appPath = Path.GetDirectoryName(exePath);
string logFileName = Path.Combine(appPath, defaultLogFileName);
if (!File.Exists(logFileName)) {
return null;
}
byte[] logFileBytes = File.ReadAllBytes(logFileName);
using (MemoryStream ms = new MemoryStream()) {
using (DeflateStream deflateStream = new DeflateStream(ms, CompressionMode.Compress, false)) {
deflateStream.Write(logFileBytes, 0, logFileBytes.Length);
byte[] compressedBytes = ms.ToArray();
report = Convert.ToBase64String(compressedBytes);
}
}
}
catch (ArgumentException e) {
Trace.TraceWarning(e.ToString());
}
catch (IOException e) {
Trace.TraceWarning(e.ToString());
}
catch (SecurityException e) {
Trace.TraceWarning(e.ToString());
}
catch (UnauthorizedAccessException e) {
Trace.TraceWarning(e.ToString());
}
return report;
}
/// <summary>
/// Returns compressed version of given string.
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string Compress(string str)
{
var barr = Encoding.Unicode.GetBytes(str + '\0'); // Why did we append a null byte... was this required?
using (var mout = new MemoryStream())
{
// Deflate should use optimal compression level by default (0, as defined by .NET 4.5).
using (var df = new DeflateStream(mout, CompressionMode.Compress))
{
// Write compressed data to memory stream.
df.Write(barr, 0, barr.Length);
}
// Compression method
int cmf = 8; // cm
cmf += 7 << 4; // cinfo
// Flags
int flg = 2 << 6; // Compression level
int n = ((cmf * 256) + flg) % 31;
if (n != 0)
flg += 31 - n; // Check bits
// <length>;<cmf><flg><data><checksum>
return string.Format("{0};{1:x02}{2:x02}{3}{4:x08}", barr.Length, cmf, flg, BitConverter.ToString(mout.ToArray()).Replace("-", "").ToLower(), ComputeAdler32(barr));
}
}
public byte[] Compress( byte[] buffer )
{
MemoryStream result = new MemoryStream();
int offset = 0;
BinaryWriter bw = new BinaryWriter( result );
bw.Write( new byte[] { 0x54, 0x4C, 0x5A, 0x43 } );
bw.Write( (byte)0x01 );
bw.Write( (byte)0x02 );
bw.Write( (byte)0x00 );
bw.Write( (byte)0x00 );
bw.Write( (int)0 ); // compressed size - we'll fill this in once we know it
bw.Write( (int)buffer.Length ); // decompressed size
bw.Write( (int)0 ); // unknown, 0
bw.Write( (int)0 ); // unknown, 0
using ( DeflateStream compressionStream = new DeflateStream( result, CompressionLevel.Optimal ) ) {
compressionStream.Write( buffer );
}
byte[] retval = result.ToArray();
// fill in compressed size
Util.CopyByteArrayPart( BitConverter.GetBytes( (int)retval.Length ), 0, retval, 8, 4 );
return retval;
}
/// <summary>
/// Compresses a data buffer using a simple huffman deflate algorithem.
/// </summary>
/// <param name="data">Data buffer to compress.</param>
/// <returns>Compressed version of data buffer.</returns>
public static byte[] Deflate(byte[] data)
{
MemoryStream memoryStream = new MemoryStream();
DeflateStream deflateStream = new DeflateStream(memoryStream, CompressionMode.Compress, true);
deflateStream.Write(data, 0, data.Length);
deflateStream.Close();
return memoryStream.ToArray();
}
public void Compress(string content, Stream targetStream)
{
using (var writer = new DeflateStream(targetStream, CompressionMode.Compress))
{
var bytes = Encoding.UTF8.GetBytes(content);
writer.Write(bytes, 0, bytes.Length);
}
}
internal static byte[] Compress(ReadOnlySpan <byte> data)
{
using var val = new MemoryStream(CompressedLengthEstimate(data));
using (var compressor = new IOC.DeflateStream(val, IOC.CompressionLevel.Optimal)) {
compressor.Write(data);
}
return(val.GetArray());
}
/// <summary>
/// Compresses the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <returns></returns>
public static byte[] Compress(byte[] data)
{
MemoryStream ms = new MemoryStream();
DeflateStream ds = new DeflateStream(ms, CompressionMode.Compress);
ds.Write(data, 0, data.Length);
ds.Flush();
ds.Close();
return ms.ToArray();
}
public static byte[] Compress(byte[] raw, int offset, int count)
{
var memory = new MemoryStream();
using (var deflate = new DeflateStream(memory, CompressionMode.Compress, true))
{
deflate.Write(raw, offset, count);
return memory.ToArray();
}
}
public static byte[] Compress(byte[] data)
{
var memoryStream = new MemoryStream();
var deflateStream = new DeflateStream(memoryStream, CompressionMode.Compress);
deflateStream.Write(data, 0, data.Length);
deflateStream.Flush();
deflateStream.Close();
return memoryStream.ToArray();
}
public byte[] Encode(byte[] data)
{
MemoryStream ms = new MemoryStream(data.Length);
ms.WriteByte(0x78); // ZLib Header for compression level 3.
ms.WriteByte(0x5e);
DeflateStream ds = new DeflateStream(ms, CompressionMode.Compress);
ds.Write(data, 0, data.Length);
ds.Close();
return ms.ToArray();
}
/// <summary>
/// 转换指定字节数组的指定区域。
/// </summary>
/// <param name="inputBuffer">要为其计算转换的输入。</param>
/// <param name="inputOffset">字节数组中的偏移量，从该位置开始使用数据。</param>
/// <param name="inputCount">字节数组中用作数据的字节数。</param>
/// <param name="outputBuffer">将转换写入的输出。</param>
/// <param name="outputOffset">输出字节数组中的偏移量，从该位置开始写入数据。</param>
/// <returns>计算所得的转换的字节数。</returns>
public override int CompressBlock(byte[] inputBuffer, int inputOffset, int inputCount, byte[] outputBuffer, int outputOffset)
{
using (var ms = new MemoryStream(outputBuffer, outputOffset, outputBuffer.Length - outputOffset, true)) {
using (var outStream = new DeflateStream(ms, CompressionMode.Compress)) {
outStream.Write(inputBuffer, inputOffset, inputCount);
outStream.Flush();
}
return (int)ms.Position;
}
}
/// <summary>
/// 转换指定字节数组的指定区域。
/// </summary>
/// <param name="inputBuffer">要为其计算转换的输入。</param>
/// <param name="inputOffset">字节数组中的偏移量，从该位置开始使用数据。</param>
/// <param name="inputCount">字节数组中用作数据的字节数。</param>
/// <returns>计算所得的转换。</returns>
public override byte[] CompressFinalBlock(byte[] inputBuffer, int inputOffset, int inputCount)
{
using (var ms = new MemoryStream()) {
using (var outStream = new DeflateStream(ms, CompressionMode.Compress)) {
outStream.Write(inputBuffer, inputOffset, inputCount);
outStream.Flush();
}
return ms.ToArray();
}
}
public byte[] Encode(byte[] data)
{
var output = new MemoryStream();
var gzipstream = new DeflateStream(output, CompressionMode.Compress);
gzipstream.Write(data, 0, data.Length);
gzipstream.Close();
byte[] compressed = output.ToArray();
output.Close();
return compressed;
}
/// <summary>
/// Decompress
/// </summary>
/// <param name="values"></param>
/// <returns></returns>
public static byte[] Decompress(byte[] values)
{
// chop off header and tail
byte[] raw = new byte[values.Length - 6];
Array.Copy(values, 2, raw, 0, values.Length - 6);
MemoryStream msOut = new MemoryStream(values.Length);
DeflateStream deflator = new DeflateStream(msOut, CompressionMode.Decompress);
deflator.Write(raw, 0, values.Length);
return msOut.ToArray();
}
public static byte[] Compress(byte[] data)
{
using (var compressedStream = new MemoryStream())
using (var zipStream = new DeflateStream(compressedStream, CompressionMode.Compress))
{
zipStream.Write(data, 0, data.Length);
zipStream.Close();
return compressedStream.ToArray();
}
}
public static byte[] Compress( byte[] input, bool addFirst2Bytes ) {
MemoryStream output = new MemoryStream();
output.Write( new byte[] { 120, 156 }, 0, 2 );
using( DeflateStream Deflate = new DeflateStream( output, CompressionMode.Compress ) ) {
Deflate.Write( input, 0, input.Length );
}
return output.ToArray();
}
public byte[] Compress(byte[] bytes)
{
using (var memoryStream = new MemoryStream())
{
using (var deflateStream = new DeflateStream(memoryStream, CompressionMode.Compress, leaveOpen: true))
{
deflateStream.Write(bytes, 0, bytes.Length);
}
return memoryStream.ToArray();
}
}
static public byte[] Deflate(byte[] input)
{
using var deflatedStream = new System.IO.MemoryStream();
using var compressor = new System.IO.Compression.DeflateStream(
deflatedStream, System.IO.Compression.CompressionMode.Compress);
compressor.Write(input, 0, input.Length);
compressor.Close();
return(deflatedStream.ToArray());
}
private static byte[] DeflateCompressor(byte[] input, int length)
{
using (var stream = new MemoryStream())
{
using (var deflate = new DeflateStream(stream, CompressionMode.Compress))
{
deflate.Write(input, 0, length);
}
return stream.ToArray();
}
}
public static Stream DeflateCompressStream(string textToCompress) {
var data = Encoding.UTF8.GetBytes(textToCompress);
using (var ms = new MemoryStream()) {
using (var zip = new DeflateStream(ms, CompressionMode.Compress)) {
zip.Write(data, 0, data.Length);
}
return new MemoryStream(ms.ToArray());
}
}
/// <summary>
/// This method prepares the binary body for output from the content.
/// </summary>
/// <param name="context">The current context.</param>
/// <param name="content">The content to be prepared.</param>
/// <returns>Returns a ResourceManagerMessageFragmentBody object with the binary representation of the content.</returns>
protected virtual ResourceManagerMessageFragmentBody PrepareBodyOutput(ResourceManagerContext context, BinaryContent content)
{
ResourceManagerMessageFragmentBody
body = context.GetObjectPool<ResourceManagerMessageFragmentBody>().Get();
byte[] blob = content.ToArray();
switch (context.Request.Data.RequestPreferredCompression)
{
case "gzip":
using (MemoryStream ms = new MemoryStream())
{
using (Stream gz = new GZipStream(ms, CompressionMode.Compress, true))
{
gz.Write(blob, 0, blob.Length);
gz.Close();
}
ms.Position = 0;
body.Load(ms);
}
body.ContentEncoding = "gzip";
break;
case "deflate":
using (MemoryStream ms = new MemoryStream())
{
using (Stream gz = new DeflateStream(ms, CompressionMode.Compress, true))
{
gz.Write(blob, 0, blob.Length);
gz.Close();
}
ms.Position = 0;
body.Load(ms);
}
body.ContentEncoding = "deflate";
break;
default:
body.Load(blob, 0, blob.Length);
break;
}
blob = null;
if (content.MimeType == null || content.MimeType == "")
{
if (context.Request.Settings.OutputColl.Count > 0)
body.ContentType = context.Request.Settings.OutputColl[0].OutputMIMEType;
else
body.ContentType = "application/octet-stream";
}
else
body.ContentType = content.MimeType;
return body;
}
private static byte[] deflateEncode(byte[] input)
{
using (MemoryStream ms = new MemoryStream())
{
using (DeflateStream dfs = new DeflateStream(ms, CompressionMode.Compress, true))
{
dfs.Write(input, 0, input.Length);
}
return ms.ToArray();
}
}
internal static byte[] Compress(byte[] data)
{
using (var ms = new MemoryStream())
{
var ds = new DeflateStream(ms, CompressionMode.Compress);
ds.Write(data, 0, data.Length);
ds.Flush();
ds.Close();
return ms.ToArray();
}
}
public static byte[] Compress(byte[] data, int startPos)
{
using (MemoryStream ms = new MemoryStream())
{
using (DeflateStream ds = new DeflateStream(ms, CompressionLevel.Fastest))
{
ds.Write(data, startPos, data.Length - startPos);
}
return ms.ToArray();
}
}
public byte[] Compress(byte[] plainText)
{
using (MemoryStream output = new MemoryStream())
{
using (DeflateStream gzip =new DeflateStream(output, CompressionMode.Compress))
{
gzip.Write(plainText,0,plainText.Length);
}
return output.ToArray();
}
}
public byte[] Deflate(string text)
{
var buffer = Encoding.UTF8.GetBytes(text);
using(var ms = new MemoryStream())
using (var zipStream = new DeflateStream(ms, CompressionMode.Compress))
{
zipStream.Write(buffer, 0, buffer.Length);
zipStream.Close();
return ms.ToArray();
}
}
public static byte[] CompressDataSet(DataSet ds)
{
ds.RemotingFormat = SerializationFormat.Binary;
BinaryFormatter bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
bf.Serialize(ms, ds);
byte[] inbyt = ms.ToArray();
System.IO.MemoryStream objStream = new MemoryStream();
System.IO.Compression.DeflateStream objZS = new System.IO.Compression.DeflateStream(objStream, System.IO.Compression.CompressionMode.Compress);
objZS.Write(inbyt, 0, inbyt.Length);
objZS.Flush();
objZS.Close();
return(objStream.ToArray());
}
private static byte[] DeflateCompressor(byte[] bytes) //Для старых (версии 8 и 9) и новых архивов
{
byte[] retVal;
using (MemoryStream compressedMemoryStream = new MemoryStream())
{
System.IO.Compression.DeflateStream compressStream = new System.IO.Compression.DeflateStream(compressedMemoryStream, System.IO.Compression.CompressionMode.Compress, true);
compressStream.Write(bytes, 0, bytes.Length);
compressStream.Close();
retVal = new byte[compressedMemoryStream.Length];
compressedMemoryStream.Position = 0L;
compressedMemoryStream.Read(retVal, 0, retVal.Length);
compressedMemoryStream.Close();
compressStream.Close();
}
return(retVal);
}
internal static byte[] CompressTest(byte[] data)
{
IOC.DeflateStream?compressor = null;
try {
using var val = new MemoryStream(CompressedLengthEstimate(data));
using (compressor = new IOC.DeflateStream(val, IOC.CompressionLevel.Optimal)) {
compressor.Write(data, 0, data.Length);
}
return(val.GetArray());
}
catch (DllNotFoundException) when(compressor is not null)
{
GC.SuppressFinalize(compressor);
throw;
}
}
public static bool Set(string cookieName, object cookieValue)
{
bool retval = true;
try
{
BinaryFormatter bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
bf.Serialize(ms, cookieValue);
byte[] inbyt = ms.ToArray();
System.IO.MemoryStream objStream = new MemoryStream();
System.IO.Compression.DeflateStream objZS = new System.IO.Compression.DeflateStream(objStream, System.IO.Compression.CompressionMode.Compress);
objZS.Write(inbyt, 0, inbyt.Length);
objZS.Flush();
objZS.Close();
byte[] b = objStream.ToArray();
string sCookieVal = Convert.ToBase64String(b);
HttpCookie cook = new HttpCookie(cookieName);
cook.Value = sCookieVal;
cook.Expires = DateTime.Today.AddDays(30);
HttpContext.Current.Response.Cookies.Add(cook);
}
catch
{
retval = false;
throw;
}
return(retval);
}
public static string ZipBase64(string s)
{
BinaryFormatter bf = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
bf.Serialize(ms, s);
byte[] inbyt = ms.ToArray();
System.IO.MemoryStream objStream = new MemoryStream();
System.IO.Compression.DeflateStream objZS = new System.IO.Compression.DeflateStream(objStream, System.IO.Compression.CompressionMode.Compress);
objZS.Write(inbyt, 0, inbyt.Length);
objZS.Flush();
objZS.Close();
byte[] b = objStream.ToArray();
string ZippedBased64 = Convert.ToBase64String(b);
return(ZippedBased64);
}
public void testDeflateStream()
{
// make sure compression works, file should be smaller
string sample = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "files", "fp.log");
byte[] uncompressed = File.ReadAllBytes(sample);
int before = uncompressed.Length;
byte[] compressed;
int after = 0;
// test deflate stream compression code
using (MemoryStream compressStream = new MemoryStream())
using (ZopfliStream compressor = new ZopfliStream(compressStream, ZopfliFormat.ZOPFLI_FORMAT_DEFLATE))
{
compressor.Write(uncompressed, 0, before);
compressor.Close();
compressed = compressStream.ToArray();
after = compressed.Length;
}
before.Should().BeGreaterThan(after);
// make sure we can decompress the file using built-in .net
byte[] decompressedBytes = new byte[before];
using (System.IO.Compression.DeflateStream decompressionStream = new System.IO.Compression.DeflateStream(new MemoryStream(compressed), System.IO.Compression.CompressionMode.Decompress))
{
decompressionStream.Read(decompressedBytes, 0, before);
}
uncompressed.Should().Equal(decompressedBytes);
// use built-in .net compression and make sure zopfil is smaller
int after_builtin = 0;
using (MemoryStream compressStream = new MemoryStream())
using (System.IO.Compression.DeflateStream compressor = new System.IO.Compression.DeflateStream(compressStream, System.IO.Compression.CompressionLevel.Optimal))
{
compressor.Write(uncompressed, 0, before);
compressor.Close();
after_builtin = compressStream.ToArray().Length;
}
after_builtin.Should().BeGreaterThan(after);
}
/// <summary>
/// Deflate压缩函数
/// </summary>
/// <param name="strSource"></param>
/// <returns></returns>
public static string DeflateCompress(this string strSource)
{
if (strSource == null || strSource.Length > 8 * 1024)
{
throw new System.ArgumentException("字符串为空或长度太大！");
}
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(strSource);
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
using (System.IO.Compression.DeflateStream stream = new System.IO.Compression.DeflateStream(ms, System.IO.Compression.CompressionMode.Compress, true))
{
stream.Write(buffer, 0, buffer.Length);
stream.Close();
}
byte[] compressedData = ms.ToArray();
ms.Close();
return(Convert.ToBase64String(compressedData)); //将压缩后的byte[]转换为Base64String
}
}
//单纯为了字符串压缩：
public string Compress(string strSource)
{
if (strSource == null || strSource.Length > 8 * 1024)
{
throw new System.ArgumentException("字符串为空或长度太大！");
}
System.Text.Encoding encoding = System.Text.Encoding.Unicode;
byte[] buffer = encoding.GetBytes(strSource);
//byte[] buffer = Convert.FromBase64String(strSource); //传入的字符串不一定是Base64String类型，这样写不行
System.IO.MemoryStream ms = new System.IO.MemoryStream();
System.IO.Compression.DeflateStream stream = new System.IO.Compression.DeflateStream(ms, System.IO.Compression.CompressionMode.Compress, true);
stream.Write(buffer, 0, buffer.Length);
stream.Close();
buffer = ms.ToArray();
ms.Close();
return(Convert.ToBase64String(buffer)); //将压缩后的byte[]转换为Base64String
}
/// <summary>
/// Deflate压缩函数
/// </summary>
/// <remarks>针对JavaScript混合压缩算法</remarks>
/// <param name="strSource"></param>
/// <returns></returns>
public static string DeflateCompress(string strSource)
{
if (string.IsNullOrWhiteSpace(strSource)) return string.Empty;
if (strSource.Length > 8 * 1024)
throw new System.ArgumentException("YSWL.Common.DEncrypt.GZip.DeflateCompress 字符串长度超过上限");
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(strSource);
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
using (System.IO.Compression.DeflateStream stream = new System.IO.Compression.DeflateStream(ms, System.IO.Compression.CompressionMode.Compress, true))
{
stream.Write(buffer, 0, buffer.Length);
stream.Close();
}
byte[] compressedData = ms.ToArray();
ms.Close();
return Convert.ToBase64String(compressedData); //将压缩后的byte[]转换为Base64String
}
}
/// <summary>
/// Decompresses deflate data to original data.
/// </summary>
/// <param name="strValue">A string that you want to be compressed.</param>
/// <returns>Compressed string in base64 encoding</returns>
public static string DeflateCompress(this string strValue)
{
if (String.IsNullOrEmpty(strValue))
{
throw new ArgumentNullException("strValue");
}
byte[] RawData = System.Text.Encoding.UTF8.GetBytes(strValue); // RawData variable memory leak.
using (MemoryStream ms = new MemoryStream())
{
return(ms.TryCatchThrow(p =>
{
using (DeflateStream ds = new DeflateStream(p, CompressionMode.Compress))
{
ds.Write(RawData, 0, RawData.Length);
}
return Convert.ToBase64String(p.ToArray());
}));
}
}
internal static unsafe T[] Compress <T>(ReadOnlySpan <byte> data) where T : unmanaged
{
if (typeof(T) == typeof(byte))
{
return((T[])(object)CompressBytes(data));
}
long requiredSize = CompressedLengthMax(data);
long capacity = AlignCount <T>(requiredSize);
if (capacity > int.MaxValue)
{
var resultArray = CompressBytes(data);
T[] copiedResult = GC.AllocateUninitializedArray <T>(AlignCount <T>(resultArray.Length));
resultArray.AsReadOnlySpan().CopyTo(copiedResult.AsSpan().AsBytes());
return(copiedResult);
}
T[] result = GC.AllocateUninitializedArray <T>((int)capacity);
long resultLength;
fixed(T *resultPtr = result)
{
using var resultStream = new UnmanagedMemoryStream((byte *)resultPtr, result.Length * sizeof(T));
using var compressor = new IOC.DeflateStream(resultStream, IOC.CompressionLevel.Optimal);
compressor.Write(data.ToArray(), 0, data.Length);
compressor.Flush();
resultLength = resultStream.Position;
}
if (result.Length != resultLength)
{
Array.Resize(ref result, (int)resultLength);
}
return(result);
}
/// <summary>
/// Compresses data using Deflate format
/// </summary>
/// <param name="RawData">A byte array that you want to be compressed.</param>
/// <returns>Compressed bytes</returns>
public static byte[] DeflateCompress(this byte[] RawData)
{
if (RawData == null)
{
throw new ArgumentException("RawData");
}
if (RawData.Length < 1)
{
throw new ArgumentOutOfRangeException("RawData", "Empty byte array.");
}
using (MemoryStream ms = new MemoryStream())
{
return(ms.TryCatchThrow(p =>
{
using (DeflateStream ds = new DeflateStream(p, CompressionMode.Compress))
{
ds.Write(RawData, 0, RawData.Length);
}
return p.ToArray();
}));
}
}
public void CompressorNotClosed_DecompressorStillSuccessful(bool closeCompressorBeforeDecompression)
{
const string Input = "example";
var ms = new MemoryStream();
using (var compressor = new DeflateStream(ms, CompressionLevel.Optimal, leaveOpen: closeCompressorBeforeDecompression))
{
compressor.Write(Encoding.ASCII.GetBytes(Input));
compressor.Flush();
if (closeCompressorBeforeDecompression)
{
compressor.Dispose();
}
ms.Position = 0;
using (var decompressor = new DeflateStream(ms, CompressionMode.Decompress, leaveOpen: true))
{
var decompressed = new MemoryStream();
decompressor.CopyTo(decompressed);
Assert.Equal(Input, Encoding.ASCII.GetString(decompressed.ToArray()));
}
}
}
/// <summary>
/// Compresses a byte array using a specified algorithm.
/// </summary>
/// <param name="dataToCompress">The byte array to compress.</param>
/// <param name="startIndex">The zero-based position in the array where the compression begins.</param>
/// <param name="algorithm">The algorithm used to compress the array.
/// This method will check the compression rate after the compression is done,
/// and if it is not smaller than 1 (indicating the "compressed" data takes even more space than the original data and the compression is ineffective),
/// the original data will be returned and this argument will be set <c>ByteCompressionMethods.None</c>.</param>
/// <returns>
/// The compressed byte array if the compression is successful;
/// or the bytes in the original byte array from <paramref name="startIndex"/> to the end if the compression is ineffective.
/// </returns>
public static byte[] Compress(this byte[] dataToCompress, int startIndex, ref ByteCompressionMethods algorithm)
{
byte[] compressedData;
using (MemoryStream compressedMs = new MemoryStream())
{
switch (algorithm)
{
case ByteCompressionMethods.GZipOptimal:
{
using (GZipStream gzs = new GZipStream(compressedMs, CompressionLevel.Optimal))
gzs.Write(dataToCompress, startIndex, dataToCompress.Length - startIndex);
compressedData = compressedMs.ToArray();
break;
}
case ByteCompressionMethods.GZipFast:
{
using (GZipStream gzs = new GZipStream(compressedMs, CompressionLevel.Fastest))
gzs.Write(dataToCompress, startIndex, dataToCompress.Length - startIndex);
compressedData = compressedMs.ToArray();
break;
}
case ByteCompressionMethods.DeflateOptimal:
{
using (DeflateStream ds = new DeflateStream(compressedMs, CompressionLevel.Optimal))
ds.Write(dataToCompress, startIndex, dataToCompress.Length - startIndex);
compressedData = compressedMs.ToArray();
break;
}
case ByteCompressionMethods.DeflateFast:
{
using (DeflateStream ds = new DeflateStream(compressedMs, CompressionLevel.Fastest))
ds.Write(dataToCompress, startIndex, dataToCompress.Length - startIndex);
compressedData = compressedMs.ToArray();
break;
}
default:
{
var tmpMs = new MemoryStream(dataToCompress, startIndex, dataToCompress.Length - startIndex);
return(tmpMs.ToArray());
}
}
}
if (compressedData.Length < dataToCompress.Length)
{
return(compressedData);
}
else
{
algorithm = ByteCompressionMethods.None;
return(dataToCompress);
}
}
public override void Write(byte[] array, int offset, int count)
{
CheckDeflateStream();
_deflateStream.Write(array, offset, count);
}
public override void Write(byte[] src, int src_offset, int count)
{
deflateStream.Write(src, src_offset, count);
}
public override void Write(byte[] buffer, int offset, int count)
{
CheckDeflateStream();
_deflateStream.Write(buffer, offset, count);
}