Word.Hex

Convert to and from strings of hexadecimal characters.

Examples assume the following:

import Array
import Word exposing (Size(Bit32), Word(D, W))

From Other to Hex

type alias CharCount =

Int

When converting from integers, the number characters in the hex string.

fromInt : CharCount -> Int -> String

Convert an integer to a string of hexadecimal characters.

fromInt 1 10
--> "a"


fromInt 8 0x42BEEF
--> "0042beef"

fromByte : Int -> String

Convert a byte to a hex string of length 2.

fromByte 0x7B
--> "7b"

fromWord : Word -> String

Convert a list of words to a string of hexadecimal characters.

W 16 |> fromWord
--> "00000010"


D 0xDEADBEEF 0x00112233 |> fromWord
--> "deadbeef00112233"

fromByteList : List Int -> String

Convert a list of bytes to a string of hexadecimal characters.

fromByteList [ 0xde, 0xad, 0xbe, 0xef ]
--> "deadbeef"

fromWordArray : Array Word -> String

Convert an array of words to a string of hexadecimal characters.

Word.fromUTF8 Bit32 "I ❤ UTF strings!" |> fromWordArray
--> "4920e29da42055544620737472696e6773210000"

toByteList : String -> List Int

Convert a string of hexadecimal values to a list of bytes.

Fails for non-hex strings.

toByteList "not hex"
--> []

Each byte requires 2 characters, so odd length strings fail

toByteList "000"
--> []

Some passing examples

toByteList "00"
--> [ 0x00 ]


toByteList "010203040506DEADbeef"
--> [ 0x01, 0x02, 0x03, 0x04
--> , 0x05, 0x06, 0xDE, 0xAD
--> , 0xBE, 0xEF
--> ]

toWordArray : Size -> String -> Array Word

Convert a string of hexadecimal values to an array of words.

toWordArray Word.Bit32 "DEADBEEFdeadbeef" |> fromWordArray
--> "deadbeefdeadbeef"