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using Ryujinx.Core.Loaders.Compression;
using System;
using System.Collections.ObjectModel;
using System.IO;
namespace Ryujinx.Core.Loaders.Executables
{
class Nso : IExecutable
{
private byte[] m_Text;
private byte[] m_RO;
private byte[] m_Data;
public ReadOnlyCollection<byte> Text => Array.AsReadOnly(m_Text);
public ReadOnlyCollection<byte> RO => Array.AsReadOnly(m_RO);
public ReadOnlyCollection<byte> Data => Array.AsReadOnly(m_Data);
public int Mod0Offset { get; private set; }
public int TextOffset { get; private set; }
public int ROOffset { get; private set; }
public int DataOffset { get; private set; }
public int BssSize { get; private set; }
[Flags]
private enum NsoFlags
{
IsTextCompressed = 1 << 0,
IsROCompressed = 1 << 1,
IsDataCompressed = 1 << 2,
HasTextHash = 1 << 3,
HasROHash = 1 << 4,
HasDataHash = 1 << 5
}
public Nso(Stream Input)
{
BinaryReader Reader = new BinaryReader(Input);
Input.Seek(0, SeekOrigin.Begin);
int NsoMagic = Reader.ReadInt32();
int Version = Reader.ReadInt32();
int Reserved = Reader.ReadInt32();
int FlagsMsk = Reader.ReadInt32();
int TextOffset = Reader.ReadInt32();
int TextMemOffset = Reader.ReadInt32();
int TextDecSize = Reader.ReadInt32();
int ModNameOffset = Reader.ReadInt32();
int ROOffset = Reader.ReadInt32();
int ROMemOffset = Reader.ReadInt32();
int RODecSize = Reader.ReadInt32();
int ModNameSize = Reader.ReadInt32();
int DataOffset = Reader.ReadInt32();
int DataMemOffset = Reader.ReadInt32();
int DataDecSize = Reader.ReadInt32();
int BssSize = Reader.ReadInt32();
byte[] BuildId = Reader.ReadBytes(0x20);
int TextSize = Reader.ReadInt32();
int ROSize = Reader.ReadInt32();
int DataSize = Reader.ReadInt32();
Input.Seek(0x24, SeekOrigin.Current);
int DynStrOffset = Reader.ReadInt32();
int DynStrSize = Reader.ReadInt32();
int DynSymOffset = Reader.ReadInt32();
int DynSymSize = Reader.ReadInt32();
byte[] TextHash = Reader.ReadBytes(0x20);
byte[] ROHash = Reader.ReadBytes(0x20);
byte[] DataHash = Reader.ReadBytes(0x20);
NsoFlags Flags = (NsoFlags)FlagsMsk;
this.TextOffset = TextMemOffset;
this.ROOffset = ROMemOffset;
this.DataOffset = DataMemOffset;
this.BssSize = BssSize;
//Text segment
Input.Seek(TextOffset, SeekOrigin.Begin);
m_Text = Reader.ReadBytes(TextSize);
if (Flags.HasFlag(NsoFlags.IsTextCompressed) || true)
{
m_Text = Lz4.Decompress(m_Text, TextDecSize);
}
//Read-only data segment
Input.Seek(ROOffset, SeekOrigin.Begin);
m_RO = Reader.ReadBytes(ROSize);
if (Flags.HasFlag(NsoFlags.IsROCompressed) || true)
{
m_RO = Lz4.Decompress(m_RO, RODecSize);
}
//Data segment
Input.Seek(DataOffset, SeekOrigin.Begin);
m_Data = Reader.ReadBytes(DataSize);
if (Flags.HasFlag(NsoFlags.IsDataCompressed) || true)
{
m_Data = Lz4.Decompress(m_Data, DataDecSize);
}
using (MemoryStream Text = new MemoryStream(m_Text))
{
BinaryReader TextReader = new BinaryReader(Text);
Text.Seek(4, SeekOrigin.Begin);
Mod0Offset = TextReader.ReadInt32();
}
}
}
}
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