LZMA-Compression with SevenZip SDK

SevenZipHelper.cs

// http://www.nullskull.com/a/768/7zip-lzma-inmemory-compression-with-c.aspx
// http://www.7-zip.org/sdk.html
namespace SevenZip.Compression.LZMA
{


    public static class SevenZipHelper
    {

        static int dictionary = 1 << 23;

        // static Int32 posStateBits = 2;
        // static Int32 litContextBits = 3; // for normal files
        // UInt32 litContextBits = 0; // for 32-bit data
        // static Int32 litPosBits = 0;
        // UInt32 litPosBits = 2; // for 32-bit data
        // static Int32 algorithm = 2;
        // static Int32 numFastBytes = 128;

        static bool eos = false;

        static CoderPropID[] propIDs = 
				{
					CoderPropID.DictionarySize,
					CoderPropID.PosStateBits,
					CoderPropID.LitContextBits,
					CoderPropID.LitPosBits,
					CoderPropID.Algorithm,
					CoderPropID.NumFastBytes,
					CoderPropID.MatchFinder,
					CoderPropID.EndMarker
				};

        // these are the default properties, keeping it simple for now:
        static object[] properties = 
				{
					(System.Int32)(dictionary),
					(System.Int32)(2),
					(System.Int32)(3),
					(System.Int32)(0),
					(System.Int32)(2),
					(System.Int32)(128),
					"bt4",
					eos
				};


        public static byte[] Compress(byte[] inputBytes)
        {
            byte[] retVal = null;
            SevenZip.Compression.LZMA.Encoder encoder = new SevenZip.Compression.LZMA.Encoder();
            encoder.SetCoderProperties(propIDs, properties);

            using (System.IO.MemoryStream strmInStream = new System.IO.MemoryStream(inputBytes))
            {
                using (System.IO.MemoryStream strmOutStream = new System.IO.MemoryStream())
                {
                    encoder.WriteCoderProperties(strmOutStream);
                    long fileSize = strmInStream.Length;
                    for (int i = 0; i < 8; i++)
                        strmOutStream.WriteByte((byte)(fileSize >> (8 * i)));

                    encoder.Code(strmInStream, strmOutStream, -1, -1, null);
                    retVal = strmOutStream.ToArray();
                } // End Using outStream

            } // End Using inStream 

            return retVal;
        } // End Function Compress


        public static byte[] Compress(string inFileName)
        {
            byte[] retVal = null;
            SevenZip.Compression.LZMA.Encoder encoder = new SevenZip.Compression.LZMA.Encoder();
            encoder.SetCoderProperties(propIDs, properties);

            using (System.IO.Stream strmInStream = new System.IO.FileStream(inFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read))
            {
                using (System.IO.MemoryStream strmOutStream = new System.IO.MemoryStream())
                {
                    encoder.WriteCoderProperties(strmOutStream);
                    long fileSize = strmInStream.Length;
                    for (int i = 0; i < 8; i++)
                        strmOutStream.WriteByte((byte)(fileSize >> (8 * i)));

                    encoder.Code(strmInStream, strmOutStream, -1, -1, null);
                    retVal = strmOutStream.ToArray();
                } // End Using outStream

            } // End Using inStream 

            return retVal;
        } // End Function Compress


        public static void Compress(string inFileName, string outFileName)
        {
            SevenZip.Compression.LZMA.Encoder encoder = new SevenZip.Compression.LZMA.Encoder();
            encoder.SetCoderProperties(propIDs, properties);

            using (System.IO.Stream strmInStream = new System.IO.FileStream(inFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read))
            {

                using (System.IO.Stream strmOutStream = new System.IO.FileStream(outFileName, System.IO.FileMode.Create)) 
                {
                    encoder.WriteCoderProperties(strmOutStream);
                    long fileSize = strmInStream.Length;
                    for (int i = 0; i < 8; i++)
                        strmOutStream.WriteByte((byte)(fileSize >> (8 * i)));

                    encoder.Code(strmInStream, strmOutStream, -1, -1, null);

                    strmOutStream.Flush();
                    strmOutStream.Close();
                } // End Using outStream

            } // End Using inStream 

        } // End Function Compress




        public static byte[] Decompress(string inFileName)
        {
            byte[] retVal = null;

            SevenZip.Compression.LZMA.Decoder decoder = new SevenZip.Compression.LZMA.Decoder();

            using (System.IO.Stream strmInStream = new System.IO.FileStream(inFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read))
            {
                strmInStream.Seek(0, 0);

                using (System.IO.MemoryStream strmOutStream = new System.IO.MemoryStream())
                {
                    byte[] properties2 = new byte[5];
                    if (strmInStream.Read(properties2, 0, 5) != 5)
                        throw (new System.Exception("input .lzma is too short"));

                    long outSize = 0;
                    for (int i = 0; i < 8; i++)
                    {
                        int v = strmInStream.ReadByte();
                        if (v < 0)
                            throw (new System.Exception("Can't Read 1"));
                        outSize |= ((long)(byte)v) << (8 * i);
                    } //Next i

                    decoder.SetDecoderProperties(properties2);

                    long compressedSize = strmInStream.Length - strmInStream.Position;
                    decoder.Code(strmInStream, strmOutStream, compressedSize, outSize, null);

                    retVal = strmOutStream.ToArray();
                } // End Using newOutStream

            } // End Using newInStream

            return retVal;
        } // End Function Decompress 


        public static void Decompress(string inFileName, string outFileName)
        {
            SevenZip.Compression.LZMA.Decoder decoder = new SevenZip.Compression.LZMA.Decoder();

            using (System.IO.Stream strmInStream = new System.IO.FileStream(inFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read))
            {
                strmInStream.Seek(0, 0);

                using (System.IO.Stream strmOutStream = new System.IO.FileStream(outFileName, System.IO.FileMode.Create)) 
                {
                    byte[] properties2 = new byte[5];
                    if (strmInStream.Read(properties2, 0, 5) != 5)
                        throw (new System.Exception("input .lzma is too short"));

                    long outSize = 0;
                    for (int i = 0; i < 8; i++)
                    {
                        int v = strmInStream.ReadByte();
                        if (v < 0)
                            throw (new System.Exception("Can't Read 1"));
                        outSize |= ((long)(byte)v) << (8 * i);
                    } // Next i 

                    decoder.SetDecoderProperties(properties2);

                    long compressedSize = strmInStream.Length - strmInStream.Position;
                    decoder.Code(strmInStream, strmOutStream, compressedSize, outSize, null);

                    strmOutStream.Flush();
                    strmOutStream.Close();
                } // End Using newOutStream 

            } // End Using newInStream 

        } // End Function Decompress 


        public static byte[] Decompress(byte[] inputBytes)
        {
            byte[] retVal = null;

            SevenZip.Compression.LZMA.Decoder decoder = new SevenZip.Compression.LZMA.Decoder();

            using (System.IO.MemoryStream strmInStream = new System.IO.MemoryStream(inputBytes))
            {
                strmInStream.Seek(0, 0);

                using (System.IO.MemoryStream strmOutStream = new System.IO.MemoryStream())
                {
                    byte[] properties2 = new byte[5];
                    if (strmInStream.Read(properties2, 0, 5) != 5)
                        throw (new System.Exception("input .lzma is too short"));

                    long outSize = 0;
                    for (int i = 0; i < 8; i++)
                    {
                        int v = strmInStream.ReadByte();
                        if (v < 0)
                            throw (new System.Exception("Can't Read 1"));
                        outSize |= ((long)(byte)v) << (8 * i);
                    } // Next i 

                    decoder.SetDecoderProperties(properties2);

                    long compressedSize = strmInStream.Length - strmInStream.Position;
                    decoder.Code(strmInStream, strmOutStream, compressedSize, outSize, null);

                    retVal = strmOutStream.ToArray();
                } // End Using newOutStream 

            } // End Using newInStream 

            return retVal;
        } // End Function Decompress 


    } // End Class SevenZipHelper 


} // End Namespace SevenZip.Compression.LZMA 

LZMA.Decompress(inStream, outStream [, Action<long, long> onProgress])

How I can assing this to a ProgressBar?

LZMA.Decompress(inStream, outStream [, Action<long, long> onProgress])

How I can assing this to a ProgressBar?

Like this for example:

var fileStream = File.OpenRead("..."); // Get Filestream to compress
var zipStream = File.Create("...");    // Output file
var totalSize = fileStream.Length;     // <- Get filesize once

// Using IProgress<T> for notifying
var prg = new Progress<(long processedBytes, long resultSize)>();
prg.ProgressChanged += (s, e) =>
{
    // Update UI / Progressbar, etc.
    // \/ this writes "Compressing: 1.52%" \/
    Console.WriteLine($"Compressing: {e.processedBytes / totalSize:p}");
};

// you can do this in Task.Run(() => ...) - Progress<T> will raise the event on the creation Thread
// pass IProgress to progress lambda, so that you can call "Report" on it
IProgress<(long processedBytes, long resultSize)> iprg = prg;
LZMA.Compress(fileStream, zipStream, LzmaSpeed.Fastest, DictionarySize.Medium,
    (cur, max) => iprg.Report((cur, max)));

@kirides Can you explain how to use this SDK to extract the 7z file into a destination folder with individual files?

@kirides Can you explain how to use this SDK to extract the 7z file into a destination folder with individual files?

tldr: Not with this kind of code

7z files are different from LZMA/2 compressed files.

7z files are archives (like .zip)
whereas LZMA/2 compressed files are more like "something.gz", or "dir.tar.xz"

Great Code!. I am trying to compress a folder. But i dont find any doc to do it. Writing filesize#1, file content#1, filesize#2, file content#2 does not seem to work.