bool PerformRelocations(MemoryArea mem, ImageReader rdr)
{
if (!rdr.TryReadBeUInt32(out uint fixup))
{
return(false);
}
if (fixup == 0)
{
return(true); // no relocations to do.
}
uint offset = fixup;
for (;;)
{
var dst = mem.BaseAddress + offset;
if (!mem.TryReadBeUInt32(offset, out uint l))
{
return(false);
}
l += mem.BaseAddress.ToUInt32();
mem.WriteBeUInt32(offset, l);
mem.Relocations.AddPointerReference(mem.BaseAddress.ToLinear() + offset, l);
for (;;)
{
if (!rdr.TryReadByte(out byte b))
{
return(false);
}
if (b == 0)
{
return(true);
}
else if (b == 1)
{
offset += 254;
}
else
{
offset += b;
break;
}
}
}
}
public Parser CreateParser()
{
if (!MemoryArea.TryReadBeUInt32(RawImage, 0, out uint magic))
{
throw new BadImageFormatException("Invalid Mach-O header.");
}
switch (magic)
{
case MH_MAGIC: return(new Loader32(this, new BeImageReader(RawImage, 0)));
case MH_MAGIC_64: return(new Loader64(this, new BeImageReader(RawImage, 0)));
case MH_MAGIC_32_LE: return(new Loader32(this, new LeImageReader(RawImage, 0)));
case MH_MAGIC_64_LE: return(new Loader64(this, new LeImageReader(RawImage, 0)));
}
throw new BadImageFormatException("Invalid Mach-O header.");
}