public PfsHeader(BinaryReader reader)
{
Magic = reader.ReadAscii(4);
NumFiles = reader.ReadInt32();
StringTableSize = reader.ReadInt32();
Reserved = reader.ReadInt32();
switch (Magic)
{
case "PFS0":
Type = PfsType.Pfs0;
break;
case "HFS0":
Type = PfsType.Hfs0;
break;
default:
throw new InvalidDataException($"Invalid Partition FS type \"{Magic}\"");
}
int entrysize = GetFileEntrySize(Type);
int stringTableOffset = 16 + entrysize * NumFiles;
HeaderSize = stringTableOffset + StringTableSize;
Files = new PfsFileEntry[NumFiles];
for (int i = 0; i < NumFiles; i++)
{
Files[i] = new PfsFileEntry(reader, Type)
{
Index = i
};
}
for (int i = 0; i < NumFiles; i++)
{
reader.BaseStream.Position = stringTableOffset + Files[i].StringTableOffset;
Files[i].Name = reader.ReadAsciiZ();
}
if (Type == PfsType.Hfs0)
{
for (int i = 0; i < NumFiles; i++)
{
reader.BaseStream.Position = HeaderSize + Files[i].Offset;
Files[i].HashValidity = Crypto.CheckMemoryHashTable(reader.ReadBytes(Files[i].HashedRegionSize), Files[i].Hash, 0, Files[i].HashedRegionSize);
}
}
}
private static int GetFileEntrySize(PfsType type)
{
switch (type)
{
case PfsType.Pfs0:
return(24);
case PfsType.Hfs0:
return(0x40);
default:
throw new ArgumentOutOfRangeException(nameof(type), type, null);
}
}
public PfsFileEntry(BinaryReader reader, PfsType type)
{
Offset = reader.ReadInt64();
Size = reader.ReadInt64();
StringTableOffset = reader.ReadUInt32();
if (type == PfsType.Hfs0)
{
HashedRegionSize = reader.ReadInt32();
Reserved = reader.ReadInt64();
Hash = reader.ReadBytes(Crypto.Sha256DigestSize);
}
else
{
Reserved = reader.ReadUInt32();
}
}
