Copyright	(c) 2020 Andrew Lelechenko (c) 2020 Composewell Technologies
License	BSD-3-Clause
Maintainer	[email protected]
Stability	experimental
Portability	GHC
Safe Haskell	None
Language	Haskell2010

Unicode.Internal.Bits

Contents

Bitmap lookup
CString

Description

Fast, static bitmap lookup utilities

Synopsis

lookupBit :: Addr# -> Int -> Int -> Bool
lookupWord8AsInt :: Addr# -> Int -> Int
lookupWord8AsInt# :: Addr# -> Int# -> Int#
lookupWord16AsInt :: Addr# -> Int -> Int
lookupWord16AsInt# :: Addr# -> Int# -> Int#
lookupWord32# :: Addr# -> Int# -> Word#
unpackCString# :: Addr# -> [Char]

Bitmap lookup

lookupBit :: Addr# -> Int -> Int -> Bool Source #

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 Source #

Arguments

:: Addr#	Bitmap address
-> Int	Word index
-> Int	Resulting word as `Int`

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#.

Since: 0.3.0

lookupWord8AsInt# Source #

Arguments

:: Addr#	Bitmap address
-> Int#	Word index
-> Int#	Resulting word as `Int`

lookupWord16AsInt Source #

Arguments

:: Addr#	Bitmap address
-> Int	Word index
-> Int	Resulting word as `Int`

lookupWord16AsInt# Source #

Arguments

:: Addr#	Bitmap address
-> Int#	Word index
-> Int#	Resulting word as `Int`

lookupWord32# Source #

Arguments

:: Addr#	Bitmap address
-> Int#	Word index
-> Word#	Resulting word

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#.

Since: 0.4.1

CString

unpackCString# :: Addr# -> [Char] #