private void ParseFile(BinaryReader br)
{
string magic = Encoding.ASCII.GetString(br.ReadBytes(4));
if (magic != HEADER_MAGIC)
{
throw new NsoException("Invalid magic");
}
br.ReadUInt64();//padding
Flag = br.ReadUInt32();
for (int i = 0; i < SEGMENT_NB; i++)
{
segments[i] = new NsoSegment(br, i, Flag);
}
BuildId = br.ReadBytes(0x20);
for (int i = 0; i < SEGMENT_NB; i++)
{
segments[i].CompressedSize = br.ReadUInt32();
}
br.BaseStream.Seek(0x24, SeekOrigin.Current); //padding
DynamicStringTable = new DataExtent(br);
DynamicSymbolTable = new DataExtent(br);
for (int i = 0; i < SEGMENT_NB; i++)
{
segments[i].Sha256 = br.ReadBytes(0x20);
}
for (int i = 0; i < SEGMENT_NB; i++)
{
segments[i].RawData = new byte[segments[i].DecompressedSize];
br.BaseStream.Position = segments[i].FileOffset;
if (segments[i].Compressed)
{
byte[] comp = br.ReadBytes((int)segments[i].CompressedSize);
segments[i].RawData = LZ4Codec.Decode(comp, 0, comp.Length, (int)segments[i].DecompressedSize);
}
else
{
segments[i].RawData = br.ReadBytes((int)segments[i].CompressedSize);
}
}
try
{
ModSection = new ModHeader(this);
}
catch (NsoException)
{
ModSection = null;
}
}
public byte[] ReadNso(uint addr, int size)
{
NsoSegment seg = (NsoSegment)GetAddressSegment(addr);
if (seg == null)
{
throw new NsoException("Invalid Address");
}
if (addr + size > seg.Address + seg.DecompressedSize)
{
throw new NsoException("Invalid Size");
}
using (MemoryStream ms = new MemoryStream(seg.RawData))
{
BinaryReader br = new BinaryReader(ms);
br.BaseStream.Position = addr - seg.Address;
return(br.ReadBytes(size));
}
}
public void WriteNso(uint addr, byte[] data)
{
NsoSegment seg = (NsoSegment)GetAddressSegment(addr);
if (seg == null)
{
throw new NsoException("Invalid Address");
}
if (addr + data.Length > seg.Address + seg.DecompressedSize)
{
throw new NsoException("Invalid Size");
}
using (MemoryStream ms = new MemoryStream(seg.RawData))
{
BinaryWriter bw = new BinaryWriter(ms);
bw.BaseStream.Position = addr - seg.Address;
bw.Write(data);
SHA256 sha = SHA256.Create();
seg.Sha256 = sha.ComputeHash(seg.RawData);
}
}
