Unicode.Internal.Bits

lookupBit addr byteIndex bitIndex looks up the bit stored in the byte at index byteIndex at the bit index bitIndex using a bitmap starting at the address addr. The caller must make sure that the byte at address (addr + byteIndex) is legally accessible memory.

lookupWord8AsInt addr index looks up for the index-th 8-bits word in the bitmap starting at addr, then convert it to an Int.

The caller must make sure that:

• ceiling (addr + (n * 8)) is legally accessible Word8#.

lookupWord32# addr index looks up for the index-th 32-bits word in the bitmap starting at addr, then convert it to a Word#.

The caller must make sure that:

• ceiling (addr + (n * 32)) is legally accessible Word32#.