| public Write ( byte buffer, int offset, int count ) : void | ||
| buffer | byte | The buffer containing data to write. |
| offset | int | The offset of the first byte to write. |
| count | int | The number of bytes to write. |
| return | void | |
public void BasicRoundTrip()
{
MemoryStream ms = new MemoryStream();
BZip2OutputStream outStream = new BZip2OutputStream(ms);
byte[] buf = new byte[10000];
System.Random rnd = new Random();
rnd.NextBytes(buf);
outStream.Write(buf, 0, buf.Length);
outStream.Close();
ms = new MemoryStream(ms.GetBuffer());
ms.Seek(0, SeekOrigin.Begin);
using (BZip2InputStream inStream = new BZip2InputStream(ms))
{
byte[] buf2 = new byte[buf.Length];
int pos = 0;
while (true)
{
int numRead = inStream.Read(buf2, pos, 4096);
if (numRead <= 0)
{
break;
}
pos += numRead;
}
for (int i = 0; i < buf.Length; ++i)
{
Assert.AreEqual(buf2[i], buf[i]);
}
}
}
public void BasicRoundTrip()
{
MemoryStream ms = new MemoryStream();
BZip2OutputStream outStream = new BZip2OutputStream(ms);
byte[] buf = new byte[10000];
System.Random rnd = new Random();
rnd.NextBytes(buf);
outStream.Write(buf, 0, buf.Length);
outStream.Close();
ms = new MemoryStream(ms.GetBuffer());
ms.Seek(0, SeekOrigin.Begin);
BZip2InputStream inStream = new BZip2InputStream(ms);
byte[] buf2 = new byte[buf.Length];
int pos = 0;
while (true)
{
int numRead = inStream.Read(buf2, pos, 4096);
if (numRead <= 0)
{
break;
}
pos += numRead;
}
for (int i = 0; i < buf.Length; ++i)
{
Assertion.AssertEquals(buf2[i], buf[i]);
}
}
/// <summary>
/// 压缩字符串
/// </summary>
/// <param name="str">需要压缩的字符串</param>
/// <returns>base64位字符串</returns>
public string CompressStr(string str)
{
//判断字符串是否为空，为空则返回结果为空
if (str == null)
{
return("");
}
//字符串不为空则执行一下语句
try
{
//定义数组存放压缩字符串字节序列
byte[] bytData = System.Text.Encoding.Unicode.GetBytes(str);
//创建存储内存流
MemoryStream ms = new MemoryStream();
//实例化BZip2OutputStream类
Stream s = new ICSharpCode.SharpZipLib.BZip2.BZip2OutputStream(ms);
//字节压缩
s.Write(bytData, 0, bytData.Length);
//关闭内存流，释放字节序列
s.Close();
//获取返回的字节序列数组
byte[] compressedData = (byte[])ms.ToArray();
//获取数组转化为base64位字符串
string result = System.Convert.ToBase64String(compressedData, 0, compressedData.Length) + " " + bytData.Length;
//返回base64位字符串
return(result);
}
catch (Exception ex)
{
//报错信息
throw ex;
}
}
/// <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;
// Compress
using(var outStream = new MemoryStream(input.Length))
using(var bz2 = new BZip2OutputStream(outStream, CompressorTool.BUFFER_SIZE)) {
bz2.Write(input, 0, input.Length);
bz2.Close();
output = outStream.ToArray();
}
if(IsDebugEnabled)
log.Debug(CompressorTool.SR.CompressResultMsg, input.Length, output.Length, output.Length / (double)input.Length);
return output;
}
public void BZip2_Compress_Extract_Test() {
var plainStream = PlainText.ToStream();
plainStream.Seek(0, SeekOrigin.Begin);
var plainData = Encoding.UTF8.GetBytes(PlainText);
byte[] compressedData;
byte[] extractedData;
// Compress
using(var compressedStream = new MemoryStream())
using(var bz2 = new BZip2OutputStream(compressedStream)) {
bz2.Write(plainData, 0, plainData.Length);
bz2.Close();
compressedData = compressedStream.ToArray();
}
Assert.IsNotNull(compressedData);
// Array.Resize(ref compressedData, compressedData.Length+1);
// compressedData[compressedData.Length - 1] = (byte)0;
// Extract
using(var compressedStream = new MemoryStream(compressedData))
using(var bz2 = new BZip2InputStream(compressedStream))
using(var extractedStream = new MemoryStream()) {
StreamTool.CopyStreamToStream(bz2, extractedStream);
extractedData = extractedStream.ToArray();
}
Assert.IsNotNull(extractedData);
string extractedText = Encoding.UTF8.GetString(extractedData).TrimEnd('\0');
Assert.AreEqual(PlainText, extractedText);
}
/// <summary>
/// Compresses a byte array
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static byte[] CompressBytes(this byte[] data)
{
// empty if null
if (data.IsNullOrEmpty())
return null;
using (MemoryStream msBZip2 = new MemoryStream())
{
int size = data.Length;
// Prepend the compressed data with the length of the uncompressed data (firs 4 bytes)
using (BinaryWriter writer = new BinaryWriter(msBZip2))
{
writer.Write(size);
using (BZip2OutputStream BZip2OutStream = new BZip2OutputStream(msBZip2))
{
BZip2OutStream.Write(data, 0, size);
}
}
// return the compressed data
return msBZip2.ToArray();
}
}
/// <summary>
///
/// </summary>
/// <param name="bytesToCompress"></param>
/// <returns></returns>
public byte[] Compress(byte[] bytesToCompress)
{
MemoryStream ms = new MemoryStream();
Stream s = new BZip2OutputStream(ms);
//fire the contents of the byte-array into the OutputStream to perform the compression
s.Write(bytesToCompress,0, bytesToCompress.Length);
s.Close();
//Convert the memoryStream back into a byte Array
byte[] compressedData = (byte[]) ms.ToArray();
ms.Close();
return compressedData;
}
public static byte[] Compress(byte[] input)
{
Contract.Requires(input != null);
Contract.Ensures(Contract.Result<byte[]>() != null);
var length = input.Length;
var ms = new MemoryStream(length);
using (var stream = new BZip2OutputStream(ms))
stream.Write(input, 0, length);
return ms.ToArray();
}
/// <summary>
/// 压缩
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string Compress(string input)
{
string result = string.Empty;
byte[] buffer = Encoding.UTF8.GetBytes(input);
using (MemoryStream outputStream = new MemoryStream())
{
using (BZip2OutputStream zipStream = new BZip2OutputStream(outputStream))
{
zipStream.Write(buffer, 0, buffer.Length);
zipStream.Close();
}
return Convert.ToBase64String(outputStream.ToArray());
}
}
public static byte[] BZip2CompressArray(byte[] data)
{
MemoryStream ms = new MemoryStream();
using (BZip2OutputStream bz = new BZip2OutputStream(ms, 9))
{
bz.IsStreamOwner = false;
bz.Write(data, 0, data.Length);
}
ms.Position = 0;
byte[] compressed = new byte[ms.Length];
ms.Read(compressed, 0, compressed.Length);
byte[] gzBuffer = new byte[compressed.Length + 4];
System.Buffer.BlockCopy(compressed, 0, gzBuffer, 4, compressed.Length);
System.Buffer.BlockCopy(BitConverter.GetBytes(data.Length), 0, gzBuffer, 0, 4);
return gzBuffer;
}
/// <summary>
/// 压缩
/// </summary>
/// <param name="param"></param>
/// <returns></returns>
public static string Compress(string param)
{
byte[] data = System.Text.Encoding.UTF8.GetBytes(param);
//byte[] data = Convert.FromBase64String(param);
MemoryStream ms = new MemoryStream();
Stream stream = new ICSharpCode.SharpZipLib.BZip2.BZip2OutputStream(ms);
try
{
stream.Write(data, 0, data.Length);
}
finally
{
stream.Close();
ms.Close();
}
return(Convert.ToBase64String(ms.ToArray()));
}
private void AddFile(string path)
{
string fileNameInDestination = this.GetFileNameInDestination(path);
if (!Directory.Exists(Path.GetDirectoryName(fileNameInDestination)))
{
Directory.CreateDirectory(Path.GetDirectoryName(fileNameInDestination));
}
string contents = this.GetMd5Sum(File.ReadAllBytes(path));
using (BZip2OutputStream stream = new BZip2OutputStream(new FileStream(fileNameInDestination + ".bz2", FileMode.Create, FileAccess.Write)))
{
byte[] buffer = File.ReadAllBytes(path);
stream.Write(buffer, 0, buffer.Length);
}
File.WriteAllText(this.GetDestinationHashLocation(fileNameInDestination), contents);
}
public static string ZipString(string sBuffer)
{
MemoryStream m_msBZip2 = null;
BZip2OutputStream m_osBZip2 = null;
string result;
try
{
m_msBZip2 = new MemoryStream();
Int32 size = sBuffer.Length;
// Prepend the compressed data with the length of the uncompressed data (firs 4 bytes)
//
using (BinaryWriter writer = new BinaryWriter(m_msBZip2, System.Text.Encoding.ASCII))
{
writer.Write(size);
m_osBZip2 = new BZip2OutputStream(m_msBZip2);
m_osBZip2.Write(Encoding.ASCII.GetBytes(sBuffer), 0, sBuffer.Length);
m_osBZip2.Close();
result = Convert.ToBase64String(m_msBZip2.ToArray());
m_msBZip2.Close();
writer.Close();
}
}
finally
{
if (m_osBZip2 != null)
{
m_osBZip2.Dispose();
}
if (m_msBZip2 != null)
{
m_msBZip2.Dispose();
}
}
return result;
}
override public void AddToStream (Stream stream, EventTracker tracker)
{
if (ChildCount > 1)
throw new Exception ("Bzip2 file " + Uri + " has " + ChildCount + " children");
if (tracker != null)
tracker.ExpectingAdded (UriFu.UriToEscapedString (this.Uri));
UnclosableStream unclosable;
unclosable = new UnclosableStream (stream);
BZip2OutputStream bz2_out;
bz2_out = new BZip2OutputStream (unclosable);
MemoryStream memory;
memory = new MemoryStream ();
// There should just be one child
foreach (FileObject file in Children)
file.AddToStream (memory, tracker);
bz2_out.Write (memory.ToArray (), 0, (int) memory.Length);
memory.Close ();
bz2_out.Close ();
}
/// <summary>
/// 压缩字符串(ICSharpCode.SharpZipLib版)
/// </summary>
/// <param name="buffer"></param>
/// <returns></returns>
public static string CompressByteToStr(byte[] buffer)
{
using (MemoryStream outputStream = new MemoryStream())
{
using (BZip2OutputStream zipStream = new BZip2OutputStream(outputStream))
{
zipStream.Write(buffer, 0, buffer.Length);
zipStream.Close();
}
return Convert.ToBase64String(outputStream.ToArray());
}
}
public void Compress(ProgressChangedEventHandler progressChanged)
{
using (FileStream archiveStream = new FileStream(ReportBaseName + ".tar",
FileMode.Create, FileAccess.Write))
{
TarArchive archive = TarArchive.CreateOutputTarArchive(archiveStream);
foreach (FileInfo file in Report.Files)
{
TarEntry entry = TarEntry.CreateEntryFromFile(file.FullName);
entry.Name = Path.GetFileName(entry.Name);
archive.WriteEntry(entry, false);
}
archive.Close();
}
using (FileStream bzipFile = new FileStream(ReportBaseName + ".tbz",
FileMode.Create))
using (FileStream tarStream = new FileStream(ReportBaseName + ".tar",
FileMode.Open, FileAccess.Read, FileShare.Read, 262144, FileOptions.DeleteOnClose))
using (BZip2OutputStream bzipStream = new BZip2OutputStream(bzipFile, 262144))
{
int lastRead = 0;
byte[] buffer = new byte[524288];
while ((lastRead = tarStream.Read(buffer, 0, buffer.Length)) != 0)
{
bzipStream.Write(buffer, 0, lastRead);
progressChanged(this, new ProgressChangedEventArgs(
(int)(tarStream.Position * 100 / tarStream.Length), null));
}
}
}
public void CompressAndSendBuffer(ref byte []buffer,DataType bDataType,ref int nX ,ref int nY)
{
if(buffer != null)
{
try
{
MemoryStream msCompressed = new MemoryStream();
BZip2OutputStream zosCompressed = new BZip2OutputStream(msCompressed);
zosCompressed.Write(buffer, 0, buffer.Length);
zosCompressed.Close();
buffer =msCompressed.ToArray();
}
catch(Exception ex)
{
WebMeeting.Client.ClientUI.getInstance().ShowExceptionMessage("Module ::: AppShare public void CompressAndSendBuffer(ref byte []buffer,DataType bDataType,ref int nX ,ref int nY)",ex,"",false);
}
}
try
{
OnDataAvailable(ref buffer,bDataType,ref nX,ref nY);
}
catch(Exception ex)
{
WebMeeting.Client.ClientUI.getInstance().ShowExceptionMessage("Module ::: AppShare public void CompressAndSendBuffer(ref byte []buffer,DataType bDataType,ref int nX ,ref int nY)",ex,"",false);
}
}
private void Compress(SteppedProgressManager progress,
ProgressChangedEventHandler progressChanged)
{
using (FileStream archiveStream = new FileStream(ReportBaseName + ".tar",
FileMode.Create, FileAccess.Write))
{
TarArchive archive = TarArchive.CreateOutputTarArchive(archiveStream);
foreach (FileInfo file in Report.Files)
{
TarEntry entry = TarEntry.CreateEntryFromFile(file.FullName);
entry.Name = Path.GetFileName(entry.Name);
archive.WriteEntry(entry, false);
}
archive.Close();
}
ProgressManager step = new ProgressManager();
progress.Steps.Add(new SteppedProgressManagerStep(step, 0.5f, "Compressing"));
using (FileStream bzipFile = new FileStream(ReportBaseName + ".tbz",
FileMode.Create))
using (FileStream tarStream = new FileStream(ReportBaseName + ".tar",
FileMode.Open, FileAccess.Read, FileShare.Read, 262144, FileOptions.DeleteOnClose))
using (BZip2OutputStream bzipStream = new BZip2OutputStream(bzipFile, 262144))
{
int lastRead = 0;
byte[] buffer = new byte[524288];
while ((lastRead = tarStream.Read(buffer, 0, buffer.Length)) != 0)
{
bzipStream.Write(buffer, 0, lastRead);
step.Completed = tarStream.Position;
step.Total = tarStream.Length;
if (progressChanged != null)
progressChanged(this, new ProgressChangedEventArgs(progress, null));
}
}
}
static void CreateInternal(byte[] oldData, byte[] newData, Stream output)
{
// check arguments
if (oldData == null)
throw new ArgumentNullException("oldData");
if (newData == null)
throw new ArgumentNullException("newData");
if (output == null)
throw new ArgumentNullException("output");
if (!output.CanSeek)
throw new ArgumentException("Output stream must be seekable.", "output");
if (!output.CanWrite)
throw new ArgumentException("Output stream must be writable.", "output");
/* Header is
0 8 "BSDIFF40"
8 8 length of bzip2ed ctrl block
16 8 length of bzip2ed diff block
24 8 length of new file */
/* File is
0 32 Header
32 ?? Bzip2ed ctrl block
?? ?? Bzip2ed diff block
?? ?? Bzip2ed extra block */
byte[] header = new byte[c_headerSize];
WriteInt64(c_fileSignature, header, 0); // "BSDIFF40"
WriteInt64(0, header, 8);
WriteInt64(0, header, 16);
WriteInt64(newData.Length, header, 24);
long startPosition = output.Position;
output.Write(header, 0, header.Length);
int[] I = SuffixSort(oldData);
byte[] db = new byte[newData.Length];
byte[] eb = new byte[newData.Length];
int dblen = 0;
int eblen = 0;
using (WrappingStream wrappingStream = new WrappingStream(output, Ownership.None))
using (BZip2OutputStream bz2Stream = new BZip2OutputStream(wrappingStream))
{
// compute the differences, writing ctrl as we go
int scan = 0;
int pos = 0;
int len = 0;
int lastscan = 0;
int lastpos = 0;
int lastoffset = 0;
while (scan < newData.Length)
{
int oldscore = 0;
for (int scsc = scan += len; scan < newData.Length; scan++)
{
len = Search(I, oldData, newData, scan, 0, oldData.Length, out pos);
for (; scsc < scan + len; scsc++)
{
if ((scsc + lastoffset < oldData.Length) && (oldData[scsc + lastoffset] == newData[scsc]))
oldscore++;
}
if ((len == oldscore && len != 0) || (len > oldscore + 8))
break;
if ((scan + lastoffset < oldData.Length) && (oldData[scan + lastoffset] == newData[scan]))
oldscore--;
}
if (len != oldscore || scan == newData.Length)
{
int s = 0;
int sf = 0;
int lenf = 0;
for (int i = 0; (lastscan + i < scan) && (lastpos + i < oldData.Length); )
{
if (oldData[lastpos + i] == newData[lastscan + i])
s++;
i++;
if (s * 2 - i > sf * 2 - lenf)
{
sf = s;
lenf = i;
}
}
int lenb = 0;
if (scan < newData.Length)
{
s = 0;
int sb = 0;
for (int i = 1; (scan >= lastscan + i) && (pos >= i); i++)
{
if (oldData[pos - i] == newData[scan - i])
s++;
if (s * 2 - i > sb * 2 - lenb)
{
sb = s;
lenb = i;
}
}
}
if (lastscan + lenf > scan - lenb)
{
int overlap = (lastscan + lenf) - (scan - lenb);
s = 0;
int ss = 0;
int lens = 0;
for (int i = 0; i < overlap; i++)
{
if (newData[lastscan + lenf - overlap + i] == oldData[lastpos + lenf - overlap + i])
s++;
if (newData[scan - lenb + i] == oldData[pos - lenb + i])
s--;
if (s > ss)
{
ss = s;
lens = i + 1;
}
}
lenf += lens - overlap;
lenb -= lens;
}
for (int i = 0; i < lenf; i++)
db[dblen + i] = (byte) (newData[lastscan + i] - oldData[lastpos + i]);
for (int i = 0; i < (scan - lenb) - (lastscan + lenf); i++)
eb[eblen + i] = newData[lastscan + lenf + i];
dblen += lenf;
eblen += (scan - lenb) - (lastscan + lenf);
byte[] buf = new byte[8];
WriteInt64(lenf, buf, 0);
bz2Stream.Write(buf, 0, 8);
WriteInt64((scan - lenb) - (lastscan + lenf), buf, 0);
bz2Stream.Write(buf, 0, 8);
WriteInt64((pos - lenb) - (lastpos + lenf), buf, 0);
bz2Stream.Write(buf, 0, 8);
lastscan = scan - lenb;
lastpos = pos - lenb;
lastoffset = pos - scan;
}
}
}
// compute size of compressed ctrl data
long controlEndPosition = output.Position;
WriteInt64(controlEndPosition - startPosition - c_headerSize, header, 8);
// write compressed diff data
using (WrappingStream wrappingStream = new WrappingStream(output, Ownership.None))
using (BZip2OutputStream bz2Stream = new BZip2OutputStream(wrappingStream))
{
bz2Stream.Write(db, 0, dblen);
}
// compute size of compressed diff data
long diffEndPosition = output.Position;
WriteInt64(diffEndPosition - controlEndPosition, header, 16);
// write compressed extra data
using (WrappingStream wrappingStream = new WrappingStream(output, Ownership.None))
using (BZip2OutputStream bz2Stream = new BZip2OutputStream(wrappingStream))
{
bz2Stream.Write(eb, 0, eblen);
}
// seek to the beginning, write the header, then seek back to end
long endPosition = output.Position;
output.Position = startPosition;
output.Write(header, 0, header.Length);
output.Position = endPosition;
}
