GARbro-mirror/ArcFormats/MicroVision/ArcARC.cs

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//! \file ArcARC.cs
//! \date Thu Mar 23 20:55:00 2017
//! \brief MicroVision resource archive.
//
// Copyright (C) 2017 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;
namespace GameRes.Formats.MicroVision
{
[Export(typeof(ArchiveFormat))]
public class ArcOpener : ArchiveFormat
{
public override string Tag { get { return "ARC/MICROVISION"; } }
public override string Description { get { return "MicroVision resource archive"; } }
public override uint Signature { get { return 0x31435241; } } // 'ARC1'
public override bool IsHierarchic { get { return true; } }
public override bool CanWrite { get { return false; } }
public override ArcFile TryOpen (ArcView file)
{
var arc = new ArcReader (file);
int count = (int)arc.ReadHeader (0xD);
if (!IsSaneCount (count))
return null;
uint names_length;
uint names_offset = arc.ReadHeader (8);
if (names_offset != 0)
{
names_length = arc.ReadHeader (9);
}
else
{
names_offset = arc.ReadHeader (7);
names_length = arc.ReadHeader (6);
}
uint index_size = names_offset + names_length;
index_size = (index_size + 0x7Fu) & ~0x7Fu;
if (index_size < 0x40 || index_size >= file.MaxOffset)
return null;
file.View.Reserve (0, index_size);
uint index_offset = arc.ReadHeader (4);
var dir = new List<Entry> (count);
for (int i = 0; i < count; ++i)
{
var name_offset = arc.ReadIndex (index_offset+2);
var name_length = arc.ReadIndex (index_offset+3);
var name = file.View.ReadString (name_offset, name_length);
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Offset = arc.ReadIndex (index_offset+4);
entry.Size = arc.ReadIndex (index_offset+5);
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.UnpackedSize = arc.ReadIndex (index_offset+6);
entry.IsPacked = entry.UnpackedSize != entry.Size;
dir.Add (entry);
index_offset += 0x20;
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var pent = entry as PackedEntry;
if (null == pent || !pent.IsPacked)
return base.OpenEntry (arc, entry);
var input = arc.File.CreateStream (entry.Offset, entry.Size);
var data = new byte[pent.UnpackedSize];
LzUnpack (input, data);
return new BinMemoryStream (data);
}
void LzUnpack (Stream input, byte[] output)
{
var frame = new byte[0x1000];
int frame_pos = 1;
const int frame_mask = 0xFFF;
int dst = 0;
int bit = 0;
int ctl = 0;
while (dst < output.Length)
{
if (0 == bit)
{
ctl = input.ReadByte();
if (-1 == ctl)
break;
bit = 0x80;
}
if (0 != (ctl & bit))
{
byte b = (byte)input.ReadByte();
frame[frame_pos++ & frame_mask] = b;
output[dst++] = b;
}
else
{
int lo = input.ReadByte();
int hi = input.ReadByte();
if (-1 == lo || -1 == hi)
break;
int offset = hi >> 4 | lo << 4;
for (int count = 2 + (hi & 0xF); count > 0 && dst < output.Length; --count)
{
byte v = frame[offset++ & frame_mask];
frame[frame_pos++ & frame_mask] = v;
output[dst++] = v;
}
}
bit >>= 1;
}
}
}
internal sealed class ArcReader
{
ArcView m_file;
const uint HeaderObfuscationStep = 0xC;
const uint IndexObfuscationStep = 7;
public ArcReader (ArcView file)
{
m_file = file;
}
public uint ReadHeader (uint offset)
{
return ReadUInt32 (offset, HeaderObfuscationStep);
}
public uint ReadIndex (uint offset)
{
return ReadUInt32 (offset, IndexObfuscationStep);
}
uint ReadUInt32 (uint offset, uint step)
{
uint v = m_file.View.ReadByte (offset);
offset += step;
v |= (uint)m_file.View.ReadByte (offset) << 8;
offset += step;
v |= (uint)m_file.View.ReadByte (offset) << 16;
offset += step;
v |= (uint)m_file.View.ReadByte (offset) << 24;
return v;
}
}
}