Codec.Binary.QRCode

An evolving QR Code encoder (and future decoder) in pure Haskell.

Currently supports encoding Numeric and Alphanumeric data.

Example

 encode (fromJust $ version 1) M Alphanumeric "hello world"

Operations

encode :: Version -> ErrorLevel -> Mode -> String -> Maybe Matrix

Returns Nothing if the input is invalid for the Mode specified.

toArray :: Bounded a => Matrix -> Array (Int, Int) a

Convert a Matrix to an array of Bounded Light modules will have the value maxBound; Dark modules will have the value minBound

width :: Matrix -> Int

The number of modules per side.

Data Constructors

version :: Int -> Maybe Version

Valid version number is [1, 40]

Data Types

data Matrix

Represents a QR Code symbol.

Instances

Show Matrix

data Module

The smallest unit in a QR Code symbol (i.e. one square).

Constructors

Dark

Light

Instances

Bounded Module

Eq Module

Show Module

data Mode

Constructors

Numeric

0123456789

Alphanumeric

0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-.:.

Input alphabets are automatically converted to upper case.

Instances

Eq Mode

Show Mode

data ErrorLevel

Constructors

L

Error recovery up to 7%.

M

Error recovery up to 15%.

Q

Error recovery up to 25%.

H

Error recovery up to 30%.

Instances

Eq ErrorLevel

Show ErrorLevel

data Version

Instances

Eq Version

Show Version