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massive fix for shells; implement MxbShell, Fix #87
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| using FreeMote.Psb; | ||
| using System; | ||
| using System.Buffers.Binary; | ||
| using System.Collections.Generic; | ||
| using System.ComponentModel.Composition; | ||
| using System.IO; | ||
| using System.Linq; | ||
| using System.Runtime.InteropServices; | ||
| using XMemCompress; | ||
| using static FreeMote.Consts; | ||
|
|
||
| namespace FreeMote.Plugins.Shells | ||
| { | ||
| [Export(typeof(IPsbShell))] | ||
| [ExportMetadata("Name", "FreeMote.Mxb")] | ||
| [ExportMetadata("Author", "Ulysses")] | ||
| [ExportMetadata("Comment", "MXB (XMemCompress) support.")] | ||
| internal class MxbShell : IPsbShell | ||
| { | ||
| public string Name => "MXB"; | ||
| public byte[] Signature { get; } = { (byte) 'm', (byte) 'x', (byte) 'b', 0 }; | ||
|
|
||
| public bool IsInShell(Stream stream, Dictionary<string, object> context = null) | ||
| { | ||
| var header = new byte[4]; | ||
| var pos = stream.Position; | ||
| _ = stream.Read(header, 0, 4); | ||
| stream.Position = pos; | ||
| if (header.SequenceEqual(Signature)) | ||
| { | ||
| if (context != null) | ||
| { | ||
| context[Context_PsbShellType] = Name; | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| return false; | ||
| } | ||
|
|
||
| public MemoryStream ToPsb(Stream stream, Dictionary<string, object> context = null) | ||
| { | ||
| if (context != null) | ||
| { | ||
| if (context.TryGetValue(Context_MdfKey, out var mdfKey)) | ||
| { | ||
| uint? keyLength = context.TryGetValue(Context_MdfKeyLength, out var kl) | ||
| ? Convert.ToUInt32(kl) | ||
| : (uint?) null; | ||
|
|
||
| stream = PsbExtension.EncodeMdf(stream, (string) mdfKey, keyLength, true); | ||
| stream.Position = 0; //A new MemoryStream | ||
| } | ||
| } | ||
|
|
||
| stream.Seek(4, SeekOrigin.Current); | ||
| var bytes = new byte[4]; | ||
| _ = stream.Read(bytes, 0, 4); | ||
| var unzippedSize = BitConverter.ToInt32(bytes, 0); | ||
|
|
||
| var ms = new MemoryStream(unzippedSize); | ||
| XCompressFile.DecompressStream(stream, ms); | ||
| ms.Seek(0, SeekOrigin.Begin); | ||
| return ms; | ||
| } | ||
|
|
||
| public MemoryStream ToShell(Stream stream, Dictionary<string, object> context = null) | ||
| { | ||
| var unzipLength = (int)stream.Length; | ||
| var ms = XCompressFile.CompressStream(stream); | ||
| if (context != null && context.TryGetValue(Context_MdfKey, out var mdfKey)) | ||
| { | ||
| uint? keyLength; | ||
| if (context.TryGetValue(Context_MdfKeyLength, out var kl)) | ||
| { | ||
| keyLength = Convert.ToUInt32(kl); | ||
| } | ||
| else | ||
| { | ||
| keyLength = (uint?) null; | ||
| } | ||
|
|
||
| var mms = PsbExtension.EncodeMdf(ms, (string) mdfKey, keyLength, false); | ||
| ms?.Dispose(); //ms disposed | ||
| ms = mms; | ||
| } | ||
|
|
||
| ms.Seek(0, SeekOrigin.Begin); | ||
| var shellMs = new MemoryStream((int) (ms.Length + 8)); | ||
| shellMs.Write(Signature, 0, 4); | ||
| shellMs.Write(BitConverter.GetBytes(unzipLength), 0, 4); | ||
| ms.CopyTo(shellMs); | ||
| ms.Dispose(); | ||
| shellMs.Seek(0, SeekOrigin.Begin); | ||
| return shellMs; | ||
| } | ||
| } | ||
| } |
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