/// <summary>
/// 압축된 데이타를 복원한다.
/// </summary>
/// <param name="input">복원할 Data</param>
/// <returns>복원된 Data</returns>
public override byte[] Decompress(byte[] input)
{
if (IsDebugEnabled)
{
log.Debug(CompressorTool.SR.DecompressStartMsg);
}
// check input data
if (input.IsZeroLength())
{
if (IsDebugEnabled)
{
log.Debug(CompressorTool.SR.InvalidInputDataMsg);
}
return(CompressorTool.EmptyBytes);
}
byte[] output;
using (var compressedStream = new MemoryStream(input)) {
using (var gzs = new GZipInputStream(compressedStream))
using (var extractedStream = new MemoryStream(input.Length * 2)) {
StreamTool.CopyStreamToStream(gzs, extractedStream, CompressorTool.BUFFER_SIZE);
output = extractedStream.ToArray();
}
}
if (IsDebugEnabled)
{
log.Debug(CompressorTool.SR.DecompressResultMsg, input.Length, output.Length, output.Length / (double)input.Length);
}
return(output);
}
/// <summary>
/// 압축된 데이타를 복원한다.
/// </summary>
/// <param name="input">복원할 Data</param>
/// <returns>복원된 Data</returns>
public override byte[] Decompress(byte[] input)
{
if (IsDebugEnabled)
{
log.Debug(CompressorTool.SR.DecompressStartMsg);
}
// check input data
if (input.IsZeroLength())
{
if (IsDebugEnabled)
{
log.Debug(CompressorTool.SR.InvalidInputDataMsg);
}
return(new byte[0]);
}
byte[] output;
var outStream = new MemoryStream(input.Length * 2);
try {
using (var inStream = new MemoryStream(input))
using (var zlib = new ZlibStream(inStream, CompressionMode.Decompress)) {
StreamTool.CopyStreamToStream(zlib, outStream, CompressorTool.BUFFER_SIZE);
output = outStream.ToArray();
}
}
catch (Exception ex) {
if (log.IsErrorEnabled)
{
log.ErrorException("압축 복원 중 예외가 발생했습니다.", ex);
}
throw;
}
finally {
outStream.Close();
}
if (IsDebugEnabled)
{
log.Debug(CompressorTool.SR.DecompressResultMsg, 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);
}
public void GZip_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 gzs = new GZipOutputStream(compressedStream)) {
gzs.SetLevel(5);
gzs.Write(plainData, 0, plainData.Length);
gzs.Finish();
compressedData = compressedStream.ToArray();
}
Assert.IsNotNull(compressedData);
// Extract
using (var compressedStream = new MemoryStream(compressedData)) {
// compressedStream.Seek(0, SeekOrigin.Begin);
using (var gzs = new GZipInputStream(compressedStream))
using (var extractedStream = new MemoryStream()) {
StreamTool.CopyStreamToStream(gzs, extractedStream);
extractedData = extractedStream.ToArray();
}
}
Assert.IsNotNull(extractedData);
string extractedText = Encoding.UTF8.GetString(extractedData).TrimEnd('\0');
Assert.AreEqual(PlainText, extractedText);
}
