GARbro-mirror/ArcFormats/NScripter/ArcSAR.cs
2015-09-01 03:38:04 +04:00

161 lines
6.6 KiB
C#

//! \file ArcSAR.cs
//! \date Tue Sep 01 01:36:24 2015
//! \brief NScripter SAR archives implementation.
//
// 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.IO;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Text;
using GameRes.Formats.Strings;
using GameRes.Utility;
namespace GameRes.Formats.NScripter
{
[Export(typeof(ArchiveFormat))]
public class SarOpener : ArchiveFormat
{
public override string Tag { get { return "SAR"; } }
public override string Description { get { return arcStrings.NSADescription; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return true; } }
public override bool CanCreate { get { return true; } }
public override ArcFile TryOpen (ArcView file)
{
int num_of_files = Binary.BigEndian (file.View.ReadInt16 (0));
if (num_of_files <= 0)
return null;
uint base_offset = Binary.BigEndian (file.View.ReadUInt32 (2));
if (base_offset >= file.MaxOffset || base_offset < 10 * (uint)num_of_files)
return null;
uint cur_offset = 6;
var dir = new List<Entry>();
for (int i = 0; i < num_of_files; ++i)
{
if (base_offset - cur_offset < 10)
return null;
int name_len;
byte[] name_buffer = ReadName (file, cur_offset, base_offset-cur_offset, out name_len);
if (0 == name_len || base_offset-cur_offset == name_len)
return null;
cur_offset += (uint)(name_len + 1);
if (base_offset - cur_offset < 8)
return null;
string name = Encodings.cp932.GetString (name_buffer, 0, name_len);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Offset = Binary.BigEndian (file.View.ReadUInt32 (cur_offset)) + (long)base_offset;
entry.Size = Binary.BigEndian (file.View.ReadUInt32 (cur_offset+4));
if (!entry.CheckPlacement (file.MaxOffset))
return null;
cur_offset += 8;
dir.Add (entry);
}
return new ArcFile (file, this, dir);
}
public override void Create (Stream output, IEnumerable<Entry> list, ResourceOptions options,
EntryCallback callback)
{
var encoding = Encodings.cp932.WithFatalFallback();
int callback_count = 0;
var real_entry_list = new List<Entry>();
var used_names = new HashSet<string>();
int index_size = 0;
foreach (var entry in list)
{
if (!used_names.Add (entry.Name)) // duplicate name
continue;
try
{
index_size += encoding.GetByteCount (entry.Name) + 1;
}
catch (EncoderFallbackException X)
{
throw new InvalidFileName (entry.Name, arcStrings.MsgIllegalCharacters, X);
}
index_size += 8;
real_entry_list.Add (entry);
}
long start_offset = output.Position;
long base_offset = 6+index_size;
output.Seek (base_offset, SeekOrigin.Current);
foreach (var entry in real_entry_list)
{
using (var input = File.OpenRead (entry.Name))
{
var file_size = input.Length;
if (file_size > uint.MaxValue)
throw new FileSizeException();
long file_offset = output.Position - base_offset;
if (file_offset+file_size > uint.MaxValue)
throw new FileSizeException();
entry.Offset = file_offset;
entry.Size = (uint)file_size;
if (null != callback)
callback (callback_count++, entry, arcStrings.MsgAddingFile);
input.CopyTo (output);
}
}
if (null != callback)
callback (callback_count++, null, arcStrings.MsgWritingIndex);
output.Position = start_offset;
using (var writer = new BinaryWriter (output, encoding, true))
{
writer.Write (Binary.BigEndian ((short)real_entry_list.Count));
writer.Write (Binary.BigEndian ((uint)base_offset));
foreach (var entry in real_entry_list)
{
writer.Write (encoding.GetBytes (entry.Name));
writer.Write ((byte)0);
writer.Write (Binary.BigEndian ((uint)entry.Offset));
writer.Write (Binary.BigEndian ((uint)entry.Size));
}
}
}
protected static byte[] ReadName (ArcView file, uint offset, uint limit, out int name_len)
{
byte[] name_buffer = new byte[40];
for (name_len = 0; name_len < limit; ++name_len)
{
byte b = file.View.ReadByte (offset+name_len);
if (0 == b)
break;
if (name_buffer.Length == name_len)
{
Array.Resize (ref name_buffer, checked(name_len/2*3));
}
name_buffer[name_len] = b;
}
return name_buffer;
}
}
}