/// <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(log.IsWarnEnabled)
log.Warn(CompressorTool.SR.InvalidInputDataMsg);
return new byte[0];
}
byte[] output;
using(var outStream = new MemoryStream())
using(var inStream = new MemoryStream(input)) {
var encoder = new NSoft.NFramework.Compressions.SevenZip.Compression.LZMA.LzmaEncoder();
encoder.SetCoderProperties(propIDs, properties);
encoder.WriteCoderProperties(outStream);
long size = inStream.Length;
for(int i = 0; i < 8; i++)
outStream.WriteByte((byte)(size >> (8 * i)));
encoder.Code(inStream, outStream, -1, -1, null);
output = outStream.ToArray();
}
if(IsDebugEnabled)
log.Debug(CompressorTool.SR.CompressResultMsg, input.Length, output.Length, output.Length / (double)input.Length);
return output ?? new byte[0];
}
/// <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 (log.IsWarnEnabled)
{
log.Warn(CompressorTool.SR.InvalidInputDataMsg);
}
return(new byte[0]);
}
byte[] output;
using (var outStream = new MemoryStream())
using (var inStream = new MemoryStream(input)) {
var encoder = new NSoft.NFramework.Compressions.SevenZip.Compression.LZMA.LzmaEncoder();
encoder.SetCoderProperties(propIDs, properties);
encoder.WriteCoderProperties(outStream);
long size = inStream.Length;
for (int i = 0; i < 8; i++)
{
outStream.WriteByte((byte)(size >> (8 * i)));
}
encoder.Code(inStream, outStream, -1, -1, null);
output = outStream.ToArray();
}
if (IsDebugEnabled)
{
log.Debug(CompressorTool.SR.CompressResultMsg, input.Length, output.Length, output.Length / (double)input.Length);
}
return(output ?? new byte[0]);
}
