public void SimpleReadWithSmallBuffer()
{
using var packStream = GetType().OpenSiblingResourceStream("r.lzma");
using var unpackTarget = new MemoryStream();
using (var lzmaStream = new LzmaStream(packStream, CompressionMode.Decompress, bufferSize: 10))
lzmaStream.CopyTo(unpackTarget);
unpackTarget.Seek(0, SeekOrigin.Begin);
using var unpackReader = new StreamReader(unpackTarget);
var unpacked = unpackReader.ReadToEnd();
Assert.AreEqual(GetReference(), unpacked);
}
private void Pack(LzmaCompressionParameters lzmaCompressionParameters)
{
using var rawStream = GetType().OpenSiblingResourceStream("flowers.bmp");
using var packTarget = new MemoryStream();
using (var lzmaStream = new LzmaStream(packTarget, lzmaCompressionParameters))
rawStream.CopyTo(lzmaStream);
using var packSource = new MemoryStream(packTarget.ToArray());
using var rawTarget = new MemoryStream();
using (var unpackLzmaStream = new LzmaStream(packSource, CompressionMode.Decompress))
unpackLzmaStream.CopyTo(rawTarget);
Assert.IsTrue(IsEqual(rawStream, rawTarget));
}
/// <summary>解压缩数据流</summary>
/// <param name="inStream">输入流</param>
/// <param name="outStream">输出流。如果不指定，则内部实例化一个内存流</param>
/// <remarks>返回输出流，注意此时指针位于末端</remarks>
public static Stream DecompressLzma(this Stream inStream, Stream outStream = null)
{
if (outStream == null)
{
outStream = new MemoryStream();
}
// 第三个参数为true，保持数据流打开，内部不应该干涉外部，不要关闭外部的数据流
using (var stream = new LzmaStream(inStream, CompressionMode.Decompress))
{
stream.CopyTo(outStream);
stream.Close();
}
return(outStream);
}
internal static MemoryStream SevenZipDecompress(Stream compressedStream, long outputSize)
{
//manually read the LZMA properties
var props = new byte[5];
compressedStream.Read(props, 0, 5);
var ms = new MemoryStream((int)outputSize);
using (var lzmaStream = new LzmaStream(props, compressedStream, -1, outputSize))
{
lzmaStream.CopyTo(ms);
}
ms.Position = 0;
return(ms);
}