sharpcompress/SharpCompress/Compressor/LZMA/Registry.cs

using System;
using System.IO;
using System.Linq;
using SharpCompress.Common.SevenZip;
using SharpCompress.Compressor.BZip2;
using SharpCompress.Compressor.Filters;
using SharpCompress.Compressor.LZMA.Utilites;
using SharpCompress.Compressor.PPMd;

namespace SharpCompress.Compressor.LZMA
{
    internal static class DecoderRegistry
    {
        private const uint k_Copy = 0x0;
        private const uint k_Delta = 3;
        private const uint k_LZMA2 = 0x21;
        private const uint k_LZMA = 0x030101;
        private const uint k_PPMD = 0x030401;
        private const uint k_BCJ = 0x03030103;
        private const uint k_BCJ2 = 0x0303011B;
        private const uint k_Deflate = 0x040108;
        private const uint k_BZip2 = 0x040202;

        internal static Stream CreateDecoderStream(CMethodId id, Stream[] inStreams, byte[] info, IPasswordProvider pass,
                                                   long limit)
        {
            switch (id.Id)
            {
                case k_Copy:
                    if (info != null)
                        throw new NotSupportedException();
                    return inStreams.Single();
                case k_LZMA:
                case k_LZMA2:
                    return new LzmaStream(info, inStreams.Single(), -1, limit);
#if !PORTABLE && !NETFX_CORE
                case CMethodId.kAESId:
                    return new AesDecoderStream(inStreams.Single(), info, pass, limit);
#endif
                case k_BCJ:
                    return new BCJFilter(false, inStreams.Single());
                case k_BCJ2:
                    return new Bcj2DecoderStream(inStreams, info, limit);
                case k_BZip2:
                    return new BZip2Stream(inStreams.Single(), CompressionMode.Decompress, true);
                case k_PPMD:
                    return new PpmdStream(new PpmdProperties(info), inStreams.Single(), false);
                default:
                    throw new NotSupportedException();
            }
        }
    }
}