(VnMaker): Add support of ZIP MP3 OGG PNG formats.

ArcFormats/VnMaker/ArcZIP.cs

@@ -0,0 +1,127 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Composition;
+using System.IO;
+using System.Linq;
+
+using SharpZip = ICSharpCode.SharpZipLib.Zip;
+
+namespace GameRes.Formats.VnMaker
+{
+    internal class ZipEntry : PackedEntry
+    {
+        public readonly SharpZip.ZipEntry NativeEntry;
+
+        public ZipEntry (SharpZip.ZipEntry zip_entry)
+        {
+            NativeEntry = zip_entry;
+            Name = zip_entry.Name;
+            Type = FormatCatalog.Instance.GetTypeFromName (zip_entry.Name);
+            IsPacked = true;
+            // design decision of having 32bit entry sizes was made early during GameRes
+            // library development. nevertheless, large files will be extracted correctly
+            // despite the fact that size is reported as uint.MaxValue, because extraction is
+            // performed by .Net framework based on real size value.
+            Size = (uint)Math.Min (zip_entry.CompressedSize, uint.MaxValue);
+            UnpackedSize = (uint)Math.Min (zip_entry.Size, uint.MaxValue);
+            Offset = zip_entry.Offset;
+        }
+    }
+
+    internal class PkZipArchive : ArcFile
+    {
+        readonly SharpZip.ZipFile m_zip;
+
+        public SharpZip.ZipFile Native { get { return m_zip; } }
+
+        public PkZipArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, SharpZip.ZipFile native)
+            : base (arc, impl, dir)
+        {
+            m_zip = native;
+        }
+
+        #region IDisposable implementation
+        bool _zip_disposed = false;
+        protected override void Dispose (bool disposing)
+        {
+            if (!_zip_disposed)
+            {
+                if (disposing)
+                    m_zip.Close();
+                _zip_disposed = true;
+            }
+            base.Dispose (disposing);
+        }
+        #endregion
+    }
+
+    [Export(typeof(ArchiveFormat))]
+    public class ZipOpener : ArchiveFormat
+    {
+        public override string         Tag { get { return "ZIP/VnMaker Encrypted ZIP Archive"; } }
+        public override string Description { get { return "VnMaker Encrypted ZIP Archive"; } }
+        public override uint     Signature { get { return 0; } }
+        public override bool  IsHierarchic { get { return true; } }
+        public override bool      CanWrite { get { return false; } }
+
+        public ZipOpener ()
+        {
+            Settings = new[] { ZipEncoding };
+            Extensions = new string[] { "zip" };
+        }
+
+        readonly EncodingSetting ZipEncoding = new EncodingSetting ("ZIPEncodingCP", "DefaultEncoding");
+
+        public override ArcFile TryOpen (ArcView file)
+        {
+            var input = file.CreateStream ();
+            try
+            {
+                var zip = DeobfuscateStream (input, GuessEncryptionKey (input));
+                if ((zip.Signature & 0xFFFF) != 0x4B50) // 'PK'
+                    throw new InvalidFormatException ();
+                return OpenZipArchive (file, zip.AsStream);
+            }
+            catch
+            {
+                input.Dispose ();
+                throw;
+            }
+        }
+
+        byte[] GuessEncryptionKey (IBinaryStream file)
+        {
+            return new byte[] { 0x0A, 0x2B, 0x36, 0x6F, 0x0B };
+        }
+
+        IBinaryStream DeobfuscateStream (IBinaryStream file, byte[] key)
+        {
+            var zip = new ByteStringEncryptedStream (file.AsStream, key, true);
+            return new BinaryStream (zip, file.Name);
+        }
+
+        internal ArcFile OpenZipArchive (ArcView file, Stream input)
+        {
+            SharpZip.ZipStrings.CodePage = Properties.Settings.Default.ZIPEncodingCP;
+            var zip = new SharpZip.ZipFile (input);
+            try
+            {
+                var files = zip.Cast<SharpZip.ZipEntry>().Where (z => !z.IsDirectory);
+                var dir = files.Select (z => new ZipEntry (z) as Entry).ToList();
+                return new PkZipArchive (file, this, dir, zip);
+            }
+            catch
+            {
+                zip.Close();
+                throw;
+            }
+        }
+
+        public override Stream OpenEntry (ArcFile arc, Entry entry)
+        {
+            var zarc = (PkZipArchive)arc;
+            var zent = (ZipEntry)entry;
+            return zarc.Native.GetInputStream (zent.NativeEntry);
+        }
+    }
+}