Moduleunicode-data-0.9.0Haskell2010

Unicode.Internal.Bits

Fast, static bitmap lookup utilities

Contents

Bitmap lookup
CString

Synopsis

value lookupBit
value lookupWord8AsInt
value lookupWord8AsInt#
value lookupWord16AsInt
value lookupWord16AsInt#
value lookupWord32#
value unpackCString#

Packageunicode-data-0.9.0
Exports7
LanguageHaskell2010
LicenceApache-2.0
SourceBits.hs

Bitmap lookup

valuelookupBit :: 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.

valuelookupWord8AsInt

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

Source#

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#.

valuelookupWord8AsInt#

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

valuelookupWord16AsInt

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

valuelookupWord16AsInt#

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

valuelookupWord32#

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

Source#

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#.

CString

valueunpackCString# :: Addr# -> [Char]