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Studio e.go! engine archive implementation.

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morkt 2015-03-31 14:30:35 +04:00
parent 5319000ad5
commit 7c01c8e5f9
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ArcFormats/ArcEGO.cs Normal file
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//! \file ArcEGO.cs
//! \date Mon Mar 30 21:03:11 2015
//! \brief Studio e.go! engine resource archives.
//
// Copyright (C) 2015 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.Text;
using GameRes.Formats.Strings;
using GameRes.Utility;
namespace GameRes.Formats.Ego
{
[Export(typeof(ArchiveFormat))]
public class DatOpener : ArchiveFormat
{
public override string Tag { get { return "EGO"; } }
public override string Description { get { return "Studio e.go! engine resource archive"; } }
public override uint Signature { get { return 0; } }
public override bool IsHierarchic { get { return true; } }
public override bool CanCreate { get { return true; } }
public DatOpener ()
{
Extensions = new string[] { "dat" };
}
public override ArcFile TryOpen (ArcView file)
{
uint data_offset = 4 + file.View.ReadUInt32 (0);
if (data_offset <= 0x14 || data_offset >= file.MaxOffset)
return null;
var dir = new List<Entry>();
long index_offset = 4;
while (index_offset < data_offset)
{
uint entry_len = file.View.ReadUInt32 (index_offset);
if (entry_len <= 0x10 || entry_len > 0x100 || index_offset + entry_len > data_offset)
return null;
var name = file.View.ReadString (index_offset+0x10, entry_len-0x10);
var entry = FormatCatalog.Instance.CreateEntry (name);
entry.Offset = file.View.ReadUInt32 (index_offset+8);
entry.Size = file.View.ReadUInt32 (index_offset+12);
if (entry.Offset < data_offset || !entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += entry_len;
}
return new ArcFile (file, this, dir);
}
public override void Create (Stream output, IEnumerable<Entry> list, ResourceOptions options,
EntryCallback callback)
{
using (var writer = new BinaryWriter (output, Encoding.ASCII, true))
{
var encoding = Encodings.cp932.WithFatalFallback();
int callback_count = 0;
if (null != callback)
callback (callback_count++, null, arcStrings.MsgWritingIndex);
writer.Write (0);
byte[] name_buf = new byte[256];
uint index_size = 0;
var entry_sizes = new List<int>();
// first, write names only
foreach (var entry in list)
{
try
{
int size = encoding.GetBytes (entry.Name, 0, entry.Name.Length, name_buf, 0);
if (name_buf.Length == size)
throw new InvalidFileName (entry.Name, arcStrings.MsgFileNameTooLong);
name_buf[size] = 0;
int entry_size = size+17;
writer.Write (entry_size);
writer.BaseStream.Seek (12, SeekOrigin.Current);
writer.Write (name_buf, 0, size+1);
entry_sizes.Add (entry_size);
index_size += (uint)entry_size;
}
catch (EncoderFallbackException X)
{
throw new InvalidFileName (entry.Name, arcStrings.MsgIllegalCharacters, X);
}
catch (ArgumentException X)
{
throw new InvalidFileName (entry.Name, arcStrings.MsgFileNameTooLong, X);
}
}
// now, write files and remember offset/sizes
long current_offset = writer.BaseStream.Position;
foreach (var entry in list)
{
if (null != callback)
callback (callback_count++, entry, arcStrings.MsgAddingFile);
entry.Offset = current_offset;
using (var input = File.OpenRead (entry.Name))
{
var file_size = input.Length;
if (file_size > uint.MaxValue || current_offset + file_size > uint.MaxValue)
throw new FileSizeException();
current_offset += file_size;
entry.Size = (uint)file_size;
input.CopyTo (output);
}
}
if (null != callback)
callback (callback_count++, null, arcStrings.MsgUpdatingIndex);
// at last, go back to directory and write offset/sizes
writer.BaseStream.Position = 0;
writer.Write (index_size);
long index_offset = 4+8;
int i = 0;
foreach (var entry in list)
{
writer.BaseStream.Position = index_offset;
int entry_size = entry_sizes[i++];
index_offset += entry_size;
writer.Write ((uint)entry.Offset);
writer.Write (entry.Size);
}
}
}
}
}