internal static void CompressToStream(Stream inStream, Stream outStream)
{
#if iOS
lock (staticEncoderLocker)
{
LZMA.Encoder encoder = staticEncoder;
#else
LZMA.Encoder encoder = new LZMA.Encoder();
#endif
encoder.SetCoderProperties(propIDs, properties);
encoder.WriteCoderProperties(outStream);
long fileSize = inStream.Length;
for (int i = 0; i < 8; i++)
outStream.WriteByte((Byte)(fileSize >> (8 * i)));
encoder.Code(inStream, outStream, -1, -1);
#if iOS
}
#endif
}
/// <summary>
/// 调用7Z的压缩数据接口
/// </summary>
/// <param name="inpbuf">将要压缩的二进制数据</param>
/// <returns></returns>
public static byte[] LzmaCompress(byte[] inpbuf)
{
try
{
CoderPropID[] propIDs =
{
CoderPropID.DictionarySize,
CoderPropID.PosStateBits,
CoderPropID.LitContextBits,
CoderPropID.LitPosBits,
CoderPropID.Algorithm,
CoderPropID.NumFastBytes,
CoderPropID.MatchFinder,
CoderPropID.EndMarker
};
object[] properties =
{
23,
2,
3,
2,
1,
128,
"bt4",
true
};
var enc = new LZMA.Encoder();
enc.SetCoderProperties(propIDs, properties);
//压缩的数据文件
var msInp = new MemoryStream(inpbuf);
//输出的压缩数据
var msOut = new MemoryStream();
enc.WriteCoderProperties(msOut);
enc.Code(msInp, msOut, -1, -1, null);
return(msOut.ToArray());
}
catch (Exception)
{
return(null);
}
}
internal static byte[] Compress(byte[] inputBytes)
{
#if iOS
lock (staticEncoderLocker)
{
LZMA.Encoder encoder = staticEncoder;
#else
LZMA.Encoder encoder = new LZMA.Encoder();
#endif
MemoryStream inStream = new MemoryStream(inputBytes);
MemoryStream outStream = new MemoryStream();
encoder.SetCoderProperties(propIDs, properties);
encoder.WriteCoderProperties(outStream);
long fileSize = inStream.Length;
for (int i = 0; i < 8; i++)
outStream.WriteByte((Byte)(fileSize >> (8 * i)));
encoder.Code(inStream, outStream, -1, -1);
return outStream.ToArray();
#if iOS
}
#endif
}
public static Stream CompressStreamLZMA(Stream inStream)
{
Int32 dictionary = 1 << 23;
Int32 posStateBits = 2;
Int32 litContextBits = 3; // for normal files
// UInt32 litContextBits = 0; // for 32-bit data
Int32 litPosBits = 0;
// UInt32 litPosBits = 2; // for 32-bit data
Int32 algorithm = 2;
Int32 numFastBytes = 128;
string mf = "bt4";
bool eos = true;
bool stdInMode = false;
CoderPropID[] propIDs =
{
CoderPropID.DictionarySize,
CoderPropID.PosStateBits,
CoderPropID.LitContextBits,
CoderPropID.LitPosBits,
CoderPropID.Algorithm,
CoderPropID.NumFastBytes,
CoderPropID.MatchFinder,
CoderPropID.EndMarker
};
object[] properties =
{
(Int32)(dictionary),
(Int32)(posStateBits),
(Int32)(litContextBits),
(Int32)(litPosBits),
(Int32)(algorithm),
(Int32)(numFastBytes),
mf,
eos
};
var outStream = new MemoryStream();
LZMA.Encoder encoder = new LZMA.Encoder();
encoder.SetCoderProperties(propIDs, properties);
encoder.WriteCoderProperties(outStream);
Int64 fileSize;
if (eos || stdInMode)
{
fileSize = -1;
}
else
{
fileSize = inStream.Length;
}
for (int i = 0; i < 8; i++)
{
outStream.WriteByte((Byte)(fileSize >> (8 * i)));
}
encoder.Code(inStream, outStream, -1, -1, null);
outStream.Seek(0, SeekOrigin.Begin);
return(outStream);
}
internal static void CompressToStream(Stream inStream, Stream outStream)
{
#if iOS
lock (staticEncoderLocker)
{
LZMA.Encoder encoder = staticEncoder;
#else
LZMA.Encoder encoder = new LZMA.Encoder();
#endif
encoder.SetCoderProperties(propIDs, properties);
encoder.WriteCoderProperties(outStream);
long fileSize = inStream.Length;
for (int i = 0; i < 8; i++)
outStream.WriteByte((Byte)(fileSize >> (8 * i)));
encoder.Code(inStream, outStream, -1, -1);
#if iOS
}
#endif
}
internal static byte[] Compress(byte[] inputBytes)
{
#if iOS
lock (staticEncoderLocker)
{
LZMA.Encoder encoder = staticEncoder;
#else
LZMA.Encoder encoder = new LZMA.Encoder();
#endif
MemoryStream inStream = new MemoryStream(inputBytes);
MemoryStream outStream = new MemoryStream();
encoder.SetCoderProperties(propIDs, properties);
encoder.WriteCoderProperties(outStream);
long fileSize = inStream.Length;
for (int i = 0; i < 8; i++)
outStream.WriteByte((Byte)(fileSize >> (8 * i)));
encoder.Code(inStream, outStream, -1, -1);
return outStream.ToArray();
#if iOS
}
#endif
}