GARbro-mirror/ArcFormats/ArcZIP.cs
morkt f1d66206bc (IResource.CanWrite): new property.
(ArchiveFormat.CanCreate): renamed to CanWrite.
2016-10-11 00:05:22 +04:00

199 lines
7.2 KiB
C#

//! \file ArcZIP.cs
//! \date Sat Mar 05 14:47:42 2016
//! \brief PKWARE ZIP archive format.
//
// Copyright (C) 2016 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Text;
using GameRes.Formats.Properties;
using GameRes.Formats.Strings;
namespace GameRes.Formats.PkWare
{
internal class ZipEntry : PackedEntry
{
public readonly ZipArchiveEntry NativeEntry;
public ZipEntry (ZipArchiveEntry zip_entry)
{
NativeEntry = zip_entry;
Name = zip_entry.FullName;
Type = FormatCatalog.Instance.GetTypeFromName (zip_entry.FullName);
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.CompressedLength, uint.MaxValue);
UnpackedSize = (uint)Math.Min (zip_entry.Length, uint.MaxValue);
// offset is unknown and reported as '0' for all files.
Offset = 0;
}
}
internal class PkZipArchive : ArcFile
{
readonly ZipArchive m_zip;
public PkZipArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, ZipArchive 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.Dispose();
_zip_disposed = true;
}
base.Dispose (disposing);
}
#endregion
}
[Export(typeof(ArchiveFormat))]
public class ZipOpener : ArchiveFormat
{
public override string Tag { get { return "ZIP"; } }
public override string Description { get { return "PKWARE archive format"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return true; } }
public override ArcFile TryOpen (ArcView file)
{
if (-1 == SearchForSignature (file))
return null;
var input = file.CreateStream();
try
{
var zip = new ZipArchive (input, ZipArchiveMode.Read, false, Encodings.cp932);
try
{
var dir = zip.Entries.Where (z => !z.FullName.EndsWith ("/"))
.Select (z => new ZipEntry (z) as Entry).ToList();
return new PkZipArchive (file, this, dir, zip);
}
catch
{
zip.Dispose();
throw;
}
}
catch
{
input.Dispose();
throw;
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
return ((ZipEntry)entry).NativeEntry.Open();
}
/// <summary>
/// Search for ZIP 'End of central directory record' near the end of file.
/// Returns offset of 'PK' signature or -1 if no signature was found.
/// </summary>
private unsafe long SearchForSignature (ArcView file)
{
uint tail_size = (uint)Math.Min (file.MaxOffset, 0x10016L);
if (tail_size < 0x16)
return -1;
var start_offset = file.MaxOffset - tail_size;
using (var view = file.CreateViewAccessor (start_offset, tail_size))
{
byte* ptr_end = view.GetPointer (start_offset);
byte* ptr = ptr_end + tail_size-0x16;
try {
for (; ptr >= ptr_end; --ptr)
{
if (6 == ptr[3] && 5 == ptr[2] && 'K' == ptr[1] && 'P' == ptr[0])
return start_offset + (ptr-ptr_end);
}
return -1;
} finally {
view.SafeMemoryMappedViewHandle.ReleasePointer();
}
}
}
public override ResourceOptions GetDefaultOptions ()
{
Encoding enc;
try
{
enc = Encoding.GetEncoding (Settings.Default.ZIPEncodingCP);
}
catch
{
enc = Encodings.cp932;
}
return new ZipOptions {
CompressionLevel = Settings.Default.ZIPCompression,
FileNameEncoding = enc,
};
}
// TODO: GUI widget for options
public override void Create (Stream output, IEnumerable<Entry> list, ResourceOptions options,
EntryCallback callback)
{
var zip_options = GetOptions<ZipOptions> (options);
int callback_count = 0;
using (var zip = new ZipArchive (output, ZipArchiveMode.Create, true, zip_options.FileNameEncoding))
{
foreach (var entry in list)
{
var zip_entry = zip.CreateEntry (entry.Name, zip_options.CompressionLevel);
using (var input = File.OpenRead (entry.Name))
using (var zip_file = zip_entry.Open())
{
if (null != callback)
callback (++callback_count, entry, arcStrings.MsgAddingFile);
input.CopyTo (zip_file);
}
}
}
}
}
public class ZipOptions : ResourceOptions
{
public CompressionLevel CompressionLevel { get; set; }
public Encoding FileNameEncoding { get; set; }
}
}