/// <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(input.Length)) {
using(var bz2 = new BZip2OutputStream(outStream, ZipLevel)) {
bz2.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;
}
public static void CompressToFile(string targetFilePath, MemoryStream streamData)
{
// Write compressed data length and compressed data to file
FileStream fs = null;
try
{
fs = new FileStream(targetFilePath, FileMode.Create);
// Write compressed data length
fs.Write(BitConverter.GetBytes(streamData.Length), 0, 4);
// Compress data
using (BZip2OutputStream gzs = new BZip2OutputStream(fs, true))
//ICSharpCode.SharpZipLib.BZip2.BZip2OutputStream(ms))
{
fs = null;
gzs.Write(streamData.GetBuffer(), 0, (int)streamData.Length);
}
}
finally
{
if (fs!=null)
fs.Dispose();
}
}
// First 4 bytes stand for uncompressed data length
// Everything else is compressed data
public static byte[] Compress(byte[] buffer)
{
MemoryStream ms = new MemoryStream();
// Write compressed data to memory stream
using (BZip2OutputStream gzs = new BZip2OutputStream(ms, true))
{
gzs.Write(buffer, 0, buffer.Length);
}
int decompressedLength = buffer.Length;
// Write compressed data length and compressed data to output buffer
ms.Position = 0;
var gz = new byte[ms.Length+4];
Buffer.BlockCopy(BitConverter.GetBytes(decompressedLength), 0, gz, 0, 4);
Buffer.BlockCopy(ms.GetBuffer(), 0, gz, 4, (int)ms.Length);
return gz;
}
/// <summary>
/// Creates a binary patch that can be used
/// (by <see cref="Apply"/>) to transform <paramref name="oldData"/> into <paramref name="newData"/>.
/// </summary>
/// <param name="oldData">The original binary data.</param>
/// <param name="newData">The new binary data.</param>
/// <param name="output">A <see cref="Stream"/> to which the patch will be written.</param>
public static void Create(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 (BZip2OutputStream bz2Stream = new BZip2OutputStream(output, true) )
{
// 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 (BZip2OutputStream bz2Stream = new BZip2OutputStream(output, true))
{
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 (BZip2OutputStream bz2Stream = new BZip2OutputStream(output, true))
{
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;
}
byte[] EncodeMessage(byte[] recipient_pubkey, byte[] msgid, byte[] replyTo, string txt, byte[] prvkey, byte[] pubkey, out byte[] aes_key, out byte[] aes_iv)
{
if (replyTo == null)
replyTo = new byte[16];
var txtbuf = Encoding.UTF8.GetBytes(txt);
var SignMessage = prvkey != null;
byte[] hash = null;
if (SignMessage)
{
using (var rsa = new RSACryptoServiceProvider())
{
RSAParameters rsap;
Shared.LoadKey2(Shared.prvToPem(prvkey), null, out rsap);
rsa.ImportParameters(rsap);
using (var ms = new MemoryStream()) //sign
{
ms.Write(msgid, 0, msgid.Length);
ms.Write(replyTo, 0, replyTo.Length);
ms.WriteShort((short)txtbuf.Length);
ms.Write(txtbuf, 0, txtbuf.Length);
ms.WriteShort((short)pubkey.Length);
ms.Write(pubkey, 0, pubkey.Length);
ms.WriteShort((short)recipient_pubkey.Length);
ms.Write(recipient_pubkey, 0, recipient_pubkey.Length);
ms.Position = 0;
hash = rsa.SignData(ms, SHA512OID);
}
}
}
byte[] c1;
using (var ms1 = new MemoryStream())
using (var ms = new BZip2OutputStream(ms1))
{
ms.Write(txtbuf, 0, txtbuf.Length);
ms.Close();
c1 = ms1.ToArray();
}
var compressText = c1.Length < txtbuf.Length;
byte[] aesmsg;
using (var aes = new RijndaelManaged())
{
using (MemoryStream msEncrypt = new MemoryStream())
{
using (var encryptor = aes.CreateEncryptor())
using (CryptoStream sw2 = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
aes_key = aes.Key;
aes_iv = aes.IV;
sw2.WriteByte((Byte)((compressText ? 1 : 0) | (SignMessage ? 2 : 0)));
sw2.Write(msgid, 0, msgid.Length);
sw2.Write(replyTo, 0, replyTo.Length);
if (compressText)
{
sw2.WriteShort((short)c1.Length);
sw2.Write(c1, 0, c1.Length);
}
else
{
sw2.WriteShort((short)txtbuf.Length);
sw2.Write(txtbuf, 0, txtbuf.Length);
}
if (SignMessage)
{
sw2.WriteShort((short)pubkey.Length);
sw2.Write(pubkey, 0, pubkey.Length);
sw2.WriteShort((short)hash.Length);
sw2.Write(hash, 0, hash.Length);
}
}
msEncrypt.Flush();
aesmsg = msEncrypt.ToArray();
}
}
return aesmsg;
}