public Z64Rom(Rom rom)
{
_rom = rom;
var identity = (UInt64)_rom.Header.Crc[0] << 32 | _rom.Header.Crc[1];
var useOffsets = true;
if (!_tableOffsets.ContainsKey(identity))
{
useOffsets = false;
}
TableOffsets offsets;
if (useOffsets)
{
offsets = _tableOffsets[identity];
}
else
{
offsets = new TableOffsets
{
FileTable = FindFileTable(rom.Data)
};
if (offsets.FileTable == 0)
{
throw new ArgumentException("File table not found. Is this a valid Zelda 64 ROM?");
}
}
var fileTablePointers = _rom.GetSegment(offsets.FileTable)
.ToWordGroups(4)
.TakeWhile(g => !g.All(w => w == 0))
.ToList();
var nameTable =
useOffsets
? _rom.GetSegment(offsets.NameTable)
.ExtractStrings(fileTablePointers.Count)
.ToList()
: new List <string>();
Files = fileTablePointers
.Where(f => f[3] != 0xFFFFFFFF && f[2] != 0xFFFFFFFF)
.Select((f, i) => new File(
f[0], f[1], f[2], f[3],
nameTable.Count > i ? nameTable[i] : null,
string.Format("{0:0000}-{1:X8}", i + 1, f[0]),
null,
_rom
))
.ToList();
CodeFile = Files.Cast <File>().FirstOrDefault(f => f.ContainsString("Yoshitaka Yasumoto"));
IEnumerable <uint[]> overlaySource;
if (useOffsets)
{
overlaySource = offsets.OverlayTables
.SelectMany(o => _rom.GetSegment(o.StartAddress, o.RecordCount * o.RecordSize)
.ToWordGroups(o.RecordSize / sizeof(UInt32))
);
}
else
{
var ovls = Files.Where(f => f.Type == FileType.Overlay)
.Select(o => (UInt64)o.VirtualStart << 32 | o.VirtualEnd)
.ToList();
overlaySource = CodeFile.FindTuples(ovls)
.SelectMany(t => Utilities.ReadU32(CodeFile.Contents, t.Value + 12) >= 0x80800000
?
CodeFile.Contents.GetSegment(t.Value, 32)
.ToWordGroups(7)
:
// Some overlays in Majora's Mask have the vma start and end addreses
// before the virtual file address pair. Here, we compensate for this
// by checking if the vma end is < 0x80800000 (overlay address space).
// If it is, we prepend the preceding 8 bytes with the rest of the record.
CodeFile.Contents.GetSegment(t.Value - 8, 8)
.Concat(CodeFile.Contents.GetSegment(t.Value, 24))
.ToWordGroups(7));
}
Overlays = overlaySource
//_rom.GetSegment(offsets.EffectOverlayTable, (int)offsets.EffectOverlayCount * (int)OverlayEntry.EffectRecordSize)
.Select(r => OverlayEntry.FromWords(r, Files.FirstOrDefault(f => f.VirtualStart == r[0])))
.Where(r => r.VmaStart >= 0x80800000 && r.VmaEnd != 0)
.OrderBy(o => o.VmaStart)
.ToList();
}