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recognize LZSS-compressed entries.

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This commit is contained in:
morkt 2015-05-15 17:34:45 +04:00
parent 8f77fde7d5
commit a60a95f226
1 changed files with 127 additions and 3 deletions
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130
ArcFormats/ArcAil.cs
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@ -27,6 +27,7 @@ using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using GameRes.Utility;
namespace GameRes.Formats.Ail
@ -40,6 +41,11 @@ namespace GameRes.Formats.Ail
public override bool IsHierarchic { get { return false; } }
public override bool CanCreate { get { return false; } }
public DatOpener ()
{
Extensions = new string[] { "dat" };
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (0);
@ -55,8 +61,13 @@ namespace GameRes.Formats.Ail
uint size = file.View.ReadUInt32 (index_offset);
if (0 != size)
{
var entry = AutoEntry.Create (file, offset+6, i.ToString ("D5"));
entry.Size = size - 6;
var entry = new PackedEntry
{
Name = i.ToString ("D5"),
Offset = offset,
Size = size,
IsPacked = false,
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
@ -64,9 +75,122 @@ namespace GameRes.Formats.Ail
}
index_offset += 4;
}
if (offset != file.MaxOffset)
if (offset != file.MaxOffset || 0 == dir.Count)
return null;
byte[] data_buf = new byte[16];
byte[] sign_buf = new byte[4];
foreach (var entry in dir.Cast<PackedEntry>())
{
uint extra = 6;
if (extra > entry.Size)
continue;
int label = file.View.ReadUInt16 (entry.Offset);
if (1 == label)
{
entry.IsPacked = true;
entry.UnpackedSize = file.View.ReadUInt32 (entry.Offset+2);
}
entry.Offset += extra;
entry.Size -= extra;
if (entry.IsPacked)
{
file.View.Read (entry.Offset, data_buf, 0, (uint)data_buf.Length);
using (var input = new MemoryStream (data_buf))
{
LzssUnpack (input, sign_buf);
uint signature = LittleEndian.ToUInt32 (sign_buf, 0);
SetEntryType (entry, signature);
}
}
else
{
uint signature = file.View.ReadUInt32 (entry.Offset);
SetEntryType (entry, signature);
}
}
return new ArcFile (file, this, dir);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var input = arc.File.CreateStream (entry.Offset, entry.Size);
var pentry = entry as PackedEntry;
if (null == pentry || !pentry.IsPacked)
return input;
using (input)
{
byte[] data = new byte[pentry.UnpackedSize];
LzssUnpack (input, data);
return new MemoryStream (data);
}
}
static void SetEntryType (Entry entry, uint signature)
{
var res = FormatCatalog.Instance.LookupSignature (signature).FirstOrDefault();
if (null != res)
{
entry.Type = res.Type;
var ext = res.Extensions.FirstOrDefault();
if (!string.IsNullOrEmpty (ext))
entry.Name += '.' + ext;
}
}
/// <summary>
/// Custom LZSS decompression with frame pre-initialization and reveresed control bits meaning.
/// </summary>
static void LzssUnpack (Stream input, byte[] output)
{
int frame_pos = 0xfee;
byte[] frame = new byte[0x1000];
for (int i = 0; i < frame_pos; ++i)
frame[i] = 0x20;
int dst = 0;
int ctl = 0;
while (dst < output.Length)
{
ctl >>= 1;
if (0 == (ctl & 0x100))
{
ctl = input.ReadByte();
if (-1 == ctl)
break;
ctl |= 0xff00;
}
if (0 == (ctl & 1))
{
int v = input.ReadByte();
if (-1 == v)
break;
output[dst++] = (byte)v;
frame[frame_pos++] = (byte)v;
frame_pos &= 0xfff;
}
else
{
int offset = input.ReadByte();
if (-1 == offset)
break;
int count = input.ReadByte();
if (-1 == count)
break;
offset |= (count & 0xf0) << 4;
count = (count & 0x0f) + 3;
for (int i = 0; i < count; i++)
{
if (dst >= output.Length)
break;
byte v = frame[offset++];
offset &= 0xfff;
frame[frame_pos++] = v;
frame_pos &= 0xfff;
output[dst++] = v;
}
}
}
}
}
}