From 9fe8399d6a4416d30ac960ea7298f477eff2aca1 Mon Sep 17 00:00:00 2001
From: Natalia Portillo <claunia@claunia.com>
Date: Wed, 7 Jun 2017 18:36:06 +0100
Subject: [PATCH] 	Added support for LZIP compressed files (.lz).

---
 .../DiscImageChef.Filters.csproj              |   1 +
 DiscImageChef.Filters/LZip.cs                 | 169 +++++++++++++++++-
 README.md                                     |   1 +
 3 files changed, 167 insertions(+), 4 deletions(-)

diff --git a/DiscImageChef.Filters/DiscImageChef.Filters.csproj b/DiscImageChef.Filters/DiscImageChef.Filters.csproj
index 815665ee..242472c1 100644
--- a/DiscImageChef.Filters/DiscImageChef.Filters.csproj
+++ b/DiscImageChef.Filters/DiscImageChef.Filters.csproj
@@ -48,6 +48,7 @@
     <Compile Include="MacBinary.cs" />
     <Compile Include="BZip2.cs" />
     <Compile Include="PCExchange.cs" />
+    <Compile Include="LZip.cs" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="..\LICENSE.LGPL">
diff --git a/DiscImageChef.Filters/LZip.cs b/DiscImageChef.Filters/LZip.cs
index 57304dbf..4cafcf55 100644
--- a/DiscImageChef.Filters/LZip.cs
+++ b/DiscImageChef.Filters/LZip.cs
@@ -5,11 +5,11 @@
 // Filename       : LZip.cs
 // Author(s)      : Natalia Portillo <claunia@claunia.com>
 //
-// Component      : Component
+// Component      : Filters.
 //
 // --[ Description ] ----------------------------------------------------------
 //
-//     Description
+//     Allow to open files that are compressed using lzip.
 //
 // --[ License ] --------------------------------------------------------------
 //
@@ -29,13 +29,174 @@
 // ----------------------------------------------------------------------------
 // Copyright © 2011-2017 Natalia Portillo
 // ****************************************************************************/
+
 using System;
+using System.IO;
+using DiscImageChef.Console;
+using SharpCompress.Compressors;
+using SharpCompress.Compressors.LZMA;
+
 namespace DiscImageChef.Filters
 {
-    public class LZip
+    public class LZip : Filter
     {
+        Stream dataStream;
+        string basePath;
+        DateTime lastWriteTime;
+        DateTime creationTime;
+        bool opened;
+        long decompressedSize;
+        Stream innerStream;
+
         public LZip()
         {
+            Name = "LZip";
+            UUID = new Guid("FCCFB0C3-32EF-40D8-9714-2333F6AC72A9");
+        }
+
+        public override void Close()
+        {
+            if(dataStream != null)
+                dataStream.Close();
+            dataStream = null;
+            basePath = null;
+            opened = false;
+        }
+
+        public override string GetBasePath()
+        {
+            return basePath;
+        }
+
+        public override Stream GetDataForkStream()
+        {
+            return innerStream;
+        }
+
+        public override string GetPath()
+        {
+            return basePath;
+        }
+
+        public override Stream GetResourceForkStream()
+        {
+            return null;
+        }
+
+        public override bool HasResourceFork()
+        {
+            return false;
+        }
+
+        public override bool Identify(byte[] buffer)
+        {
+            return buffer[0] == 0x4C && buffer[1] == 0x5A && buffer[2] == 0x49 && buffer[3] == 0x50 && buffer[4] == 0x01;
+        }
+
+        public override bool Identify(Stream stream)
+        {
+            byte[] buffer = new byte[5];
+
+            stream.Seek(0, SeekOrigin.Begin);
+            stream.Read(buffer, 0, 5);
+            stream.Seek(0, SeekOrigin.Begin);
+
+            return buffer[0] == 0x4C && buffer[1] == 0x5A && buffer[2] == 0x49 && buffer[3] == 0x50 && buffer[4] == 0x01;
+        }
+
+        public override bool Identify(string path)
+        {
+            if(File.Exists(path))
+            {
+                FileStream stream = new FileStream(path, FileMode.Open, FileAccess.Read);
+                byte[] buffer = new byte[5];
+
+                stream.Seek(0, SeekOrigin.Begin);
+                stream.Read(buffer, 0, 5);
+                stream.Seek(0, SeekOrigin.Begin);
+
+                return buffer[0] == 0x4C && buffer[1] == 0x5A && buffer[2] == 0x49 && buffer[3] == 0x50 && buffer[4] == 0x01;
+            }
+
+            return false;
+        }
+
+        public override void Open(byte[] buffer)
+        {
+            dataStream = new MemoryStream(buffer);
+            basePath = null;
+            creationTime = DateTime.UtcNow;
+            lastWriteTime = creationTime;
+            innerStream = new ForcedSeekStream<LZipStream>(dataStream, CompressionMode.Decompress, false);
+            decompressedSize = innerStream.Length;
+            opened = true;
+        }
+
+        public override void Open(Stream stream)
+        {
+            dataStream = stream;
+            basePath = null;
+            creationTime = DateTime.UtcNow;
+            lastWriteTime = creationTime;
+            innerStream = new ForcedSeekStream<LZipStream>(dataStream, CompressionMode.Decompress, false);
+            decompressedSize = innerStream.Length;
+            opened = true;
+        }
+
+        public override void Open(string path)
+        {
+            dataStream = new FileStream(path, FileMode.Open, FileAccess.Read);
+            basePath = Path.GetFullPath(path);
+
+            DateTime start = DateTime.UtcNow;
+            DateTime end = DateTime.UtcNow;
+
+            FileInfo fi = new FileInfo(path);
+            creationTime = fi.CreationTimeUtc;
+            lastWriteTime = fi.LastWriteTimeUtc;
+            innerStream = new ForcedSeekStream<LZipStream>(dataStream, CompressionMode.Decompress, false);
+            decompressedSize = innerStream.Length;
+            opened = true;
+        }
+
+        public override DateTime GetCreationTime()
+        {
+            return creationTime;
+        }
+
+        public override long GetDataForkLength()
+        {
+            return decompressedSize;
+        }
+
+        public override DateTime GetLastWriteTime()
+        {
+            return lastWriteTime;
+        }
+
+        public override long GetLength()
+        {
+            return decompressedSize;
+        }
+
+        public override long GetResourceForkLength()
+        {
+            return 0;
+        }
+
+        public override string GetFilename()
+        {
+            return basePath != null ? Path.GetFileName(basePath) : null;
+        }
+
+        public override string GetParentFolder()
+        {
+            return Path.GetDirectoryName(basePath);
+        }
+
+        public override bool IsOpened()
+        {
+            return opened;
         }
     }
-}
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index dfa4caa3..0168d494 100644
--- a/README.md
+++ b/README.md
@@ -170,6 +170,7 @@ Supported filters
 * AppleSingle
 * BZip2
 * GZip
+* LZip
 * MacBinary I, II, III
 
 Changelog