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https://github.com/kwsch/pk3DS.git
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Add ALYT reading
static method also provided to jump to just the interior contents, since gamefreak loves their container inception (ALYT->single SARC->files) usage: var alyt = new ALYT(path); File.WriteAllBytes(outpath1, alyt.Data); File.WriteAllBytes(outpath2, ALYT.GetData(path)); supports input of filepath/byte[]/stream
This commit is contained in:
Kurt
@@ -1,12 +1,240 @@
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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namespace CTR
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namespace pk3DS.Core.CTR
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{
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/// <summary>
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/// Archive LaYouT container
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/// </summary>
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/// <remarks> File length is padded to nearest 0x80 </remarks>
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public class ALYT
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{
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private const string Identifier = nameof(ALYT);
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public string Magic; // 0x00
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public short unk4; // 0x04
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public short unk6; // 0x06
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public int LTBLOffset; // 0x08
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public int LTBLSize; // 0x0C
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public int LMTLOffset; // 0x10
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public int LMTLSize; // 0x14
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public int LFNLOffset; // 0x18
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public int LFNLSize; // 0x1C
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public int DataOffset; // 0x20
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public int DataSize; // 0x24
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public LTBL LTBL;
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public LMTL LMTL;
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public LFNL LFNL;
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public Contents Content;
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public byte[] Data;
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public string FileName { get; }
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public string FilePath { get; }
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public string Extension { get; }
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public bool SigMatches => Magic == Identifier;
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public ALYT(string path)
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{
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FileName = Path.GetFileNameWithoutExtension(path);
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FilePath = Path.GetDirectoryName(path);
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Extension = Path.GetExtension(path);
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using (var br = new BinaryReader(File.OpenRead(path)))
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ReadALYT(br);
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}
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public ALYT(byte[] data)
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{
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using (var ms = new MemoryStream(data))
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using (var br = new BinaryReader(ms))
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ReadALYT(br);
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}
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public ALYT(Stream ms)
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{
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using (var br = new BinaryReader(ms))
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ReadALYT(br);
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}
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private void ReadALYT(BinaryReader br)
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{
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ReadHeader(br);
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LTBL = new LTBL(br, (LTBLSize - 8) / 4);
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LMTL = new LMTL(br, (LMTLSize - 8) / 4);
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LFNL = new LFNL(br, (LFNLSize - 8) / 4);
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Content = new Contents(br, this);
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}
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private void ReadHeader(BinaryReader br)
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{
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Magic = new string(br.ReadChars(4));
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if (!SigMatches)
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return;
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unk4 = br.ReadInt16();
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unk6 = br.ReadInt16();
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LTBLOffset = br.ReadInt32();
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LTBLSize = br.ReadInt32();
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LMTLOffset = br.ReadInt32();
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LMTLSize = br.ReadInt32();
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LFNLOffset = br.ReadInt32();
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LFNLSize = br.ReadInt32();
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DataOffset = br.ReadInt32();
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DataSize = br.ReadInt32();
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}
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public class Contents
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{
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public readonly string[] Labels;
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public readonly string[] Symbols;
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public Contents(BinaryReader br, ALYT alyt)
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{
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br.BaseStream.Position = alyt.DataOffset;
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Labels = new string[br.ReadInt32()];
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for (int i = 0; i < Labels.Length; i++)
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Labels[i] = ReadString(br, 0x40);
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Symbols = new string[br.ReadInt32()];
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for (int i = 0; i < Symbols.Length; i++)
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Symbols[i] = ReadString(br, 0x20);
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// skip to end of section
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// this is bad
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while (br.PeekChar() == 0)
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br.ReadByte();
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int len = (int)br.BaseStream.Position - alyt.DataOffset;
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len = alyt.DataSize - len;
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alyt.Data = br.ReadBytes(len);
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}
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public static string ReadString(BinaryReader br, int skip)
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{
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var sb = new StringBuilder();
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var ofs = br.BaseStream.Position;
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while (true)
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{
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var c = (char)br.ReadByte();
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if (c == 0)
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{
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br.BaseStream.Position = ofs + skip;
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return sb.ToString();
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}
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sb.Append(c);
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}
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}
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}
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/// <summary>
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/// Rips out the data portion of the ALYT, assuming the ALYT is partially valid.
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/// </summary>
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public static byte[] GetData(string path)
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{
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using (var br = new BinaryReader(File.OpenRead(path)))
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return GetData(br);
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}
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/// <summary>
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/// Rips out the data portion of the ALYT, assuming the ALYT is partially valid.
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/// </summary>
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public static byte[] GetData(byte[] data)
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{
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using (var ms = new MemoryStream(data))
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using (var br = new BinaryReader(ms))
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return GetData(br);
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}
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/// <summary>
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/// Rips out the data portion of the ALYT, assuming the ALYT is partially valid.
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/// </summary>
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public static byte[] GetData(Stream ms)
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{
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using (var br = new BinaryReader(ms))
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return GetData(br);
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}
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private static byte[] GetData(BinaryReader br)
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{
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if (br.BaseStream.Length <= 0x80)
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return null;
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if (Identifier != new string(br.ReadChars(4)))
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return null; // not ALYT
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br.BaseStream.Position = 0x20; // DataOffset
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int start = br.ReadInt32();
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int length = br.ReadInt32();
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br.BaseStream.Position = start;
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int count40 = br.ReadInt32();
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br.BaseStream.Position += count40 * 0x40;
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int count20 = br.ReadInt32();
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br.BaseStream.Position += count20 * 0x20;
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// skip to end of section
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// this is bad
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while (br.PeekChar() == 0)
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br.ReadByte();
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int len = (int)br.BaseStream.Position - start;
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len = length - len;
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return br.ReadBytes(len);
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}
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}
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public class LTBL
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{
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private const string Identifier = nameof(LTBL);
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public string Magic; // 0x00
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public short unk4; // 0x04
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public short unk6; // 0x06
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public List<int> Values;
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public LTBL(BinaryReader br, int count)
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{
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Magic = new string(br.ReadChars(Identifier.Length));
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unk4 = br.ReadInt16();
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unk6 = br.ReadInt16();
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Values = new List<int>(count);
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for (int i = 0; i < count; i++)
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Values.Add((short)br.ReadInt32());
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}
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}
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public class LMTL
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{
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private const string Identifier = nameof(LMTL);
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public string Magic; // 0x00
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public short unk4; // 0x04
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public short unk6; // 0x06
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public List<int> Values;
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public LMTL(BinaryReader br, int count)
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{
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Magic = new string(br.ReadChars(Identifier.Length));
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unk4 = br.ReadInt16();
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unk6 = br.ReadInt16();
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Values = new List<int>(count);
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for (int i = 0; i < count; i++)
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Values.Add((short)br.ReadInt32());
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}
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}
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public class LFNL
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{
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private const string Identifier = nameof(LFNL);
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public string Magic; // 0x00
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public short unk4; // 0x04
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public short unk6; // 0x06
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public List<int> Values;
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public LFNL(BinaryReader br, int count)
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{
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Magic = new string(br.ReadChars(Identifier.Length));
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unk4 = br.ReadInt16();
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unk6 = br.ReadInt16();
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Values = new List<int>(count);
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for (int i = 0; i < count; i++)
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Values.Add((short)br.ReadInt32());
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}
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}
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}
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