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variation of PAC archives.

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This commit is contained in:
morkt 2016-09-09 13:15:29 +04:00
parent 120b4aa3cd
commit 36b912da07
1 changed files with 101 additions and 39 deletions
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140
ArcFormats/Nexas/ArcPAC.cs
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@ -73,41 +73,107 @@ namespace GameRes.Formats.NeXAS
{
if (!file.View.AsciiEqual (0, "PAC") || 'K' == file.View.ReadByte (3))
return null;
int count = file.View.ReadInt32 (4);
if (!IsSaneCount (count))
return null;
int pack_type = file.View.ReadInt32 (8);
uint index_size = file.View.ReadUInt32 (file.MaxOffset-4);
if (index_size >= file.MaxOffset)
var reader = new IndexReader (file);
var dir = reader.Read();
if (null == dir)
return null;
byte[] index_packed = new byte[index_size];
file.View.Read (file.MaxOffset-4-index_size, index_packed, 0, index_size);
for (int i = 0; i < index_packed.Length; ++i)
index_packed[i] = (byte)~index_packed[i];
var index = HuffmanDecode (index_packed, count*0x4c);
var dir = new List<Entry> (count);
int offset = 0;
for (int i = 0; i < count; ++i, offset += 0x4c)
{
var name = Binary.GetCString (index, offset, 0x40);
var entry = new PackedEntry
{
Name = name,
Type = FormatCatalog.Instance.GetTypeFromName (name),
Offset = LittleEndian.ToUInt32 (index, offset+0x40),
UnpackedSize = LittleEndian.ToUInt32 (index, offset+0x44),
Size = LittleEndian.ToUInt32 (index, offset+0x48),
};
if (!entry.CheckPlacement (file.MaxOffset))
return null;
entry.IsPacked = pack_type != 0 && (pack_type != 4 || entry.Size != entry.UnpackedSize);
dir.Add (entry);
}
if (0 == pack_type)
if (Compression.None == reader.PackType)
return new ArcFile (file, this, dir);
return new PacArchive (file, this, dir, (Compression)pack_type);
return new PacArchive (file, this, dir, reader.PackType);
}
internal sealed class IndexReader
{
ArcView m_file;
int m_count;
int m_pack_type;
const int MaxNameLength = 0x40;
public Compression PackType { get { return (Compression)m_pack_type; } }
public IndexReader (ArcView file)
{
m_file = file;
m_count = file.View.ReadInt32 (4);
m_pack_type = file.View.ReadInt32 (8);
}
List<Entry> m_dir;
public List<Entry> Read ()
{
if (!IsSaneCount (m_count))
return null;
m_dir = new List<Entry> (m_count);
bool success = false;
try
{
success = ReadOld();
}
catch { /* ignore parse errors */ }
if (!success && !ReadNew())
return null;
return m_dir;
}
bool ReadNew ()
{
uint index_size = m_file.View.ReadUInt32 (m_file.MaxOffset-4);
int unpacked_size = m_count*0x4C;
if (index_size >= m_file.MaxOffset || index_size > unpacked_size*2)
return false;
var index_packed = m_file.View.ReadBytes (m_file.MaxOffset-4-index_size, index_size);
for (int i = 0; i < index_packed.Length; ++i)
index_packed[i] = (byte)~index_packed[i];
var index = HuffmanDecode (index_packed, unpacked_size);
using (var input = new MemoryStream (index))
if (!ReadFromStream (input, 0x40))
return false;
return true;
}
bool ReadOld ()
{
using (var input = m_file.CreateStream())
{
input.Position = 0xC;
if (!ReadFromStream (input, 0x20))
return false;
}
return true;
}
byte[] m_name_buffer = new byte[MaxNameLength];
bool ReadFromStream (Stream input, int name_length)
{
m_dir.Clear();
using (var index = new ArcView.Reader (input))
{
for (int i = 0; i < m_count; ++i)
{
if (name_length != index.Read (m_name_buffer, 0, name_length))
return false;
var name = Binary.GetCString (m_name_buffer, 0, name_length);
if (string.IsNullOrWhiteSpace (name))
return false;
var entry = FormatCatalog.Instance.Create<PackedEntry> (name);
entry.Offset = index.ReadUInt32();
entry.UnpackedSize = index.ReadUInt32();
entry.Size = index.ReadUInt32();
if (!entry.CheckPlacement (m_file.MaxOffset))
return false;
entry.IsPacked = m_pack_type != 0 && (m_pack_type != 4 || entry.Size != entry.UnpackedSize);
m_dir.Add (entry);
}
return true;
}
}
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
@ -120,19 +186,15 @@ namespace GameRes.Formats.NeXAS
switch (pac.PackType)
{
case Compression.Lzss:
using (input)
using (var reader = new LzssReader (input, (int)pent.Size, (int)pent.UnpackedSize))
{
reader.Unpack();
return new MemoryStream (reader.Data, false);
}
return new LzssStream (input);
case Compression.Huffman:
using (input)
{
var packed = new byte[entry.Size];
input.Read (packed, 0, packed.Length);
var unpacked = HuffmanDecode (packed, (int)pent.UnpackedSize);
return new MemoryStream (unpacked, 0, (int)pent.UnpackedSize, false);
return new MemoryStream (unpacked, 0, (int)pent.UnpackedSize);
}
case Compression.Deflate:
default: