utils

package
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Published: Apr 26, 2016 License: MIT Imports: 3 Imported by: 0

Documentation

Overview

Package utils contain some utilities which are needed to create barcodes

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func IntToRune

func IntToRune(i int) rune

IntToRune converts a digit 0 - 9 to the rune '0' - '9'. If the given int is outside of this range 'F' is returned!

func New1DCode

func New1DCode(codeKind, content string, bars *BitList, checksum int) barcode.Barcode

New1DCode creates a new 1D barcode where the bars are represented by the bits in the bars BitList

func RuneToInt

func RuneToInt(r rune) int

RuneToInt converts a rune between '0' and '9' to an integer between 0 and 9 If the rune is outside of this range -1 is returned.

Types

type BitList

type BitList struct {
	// contains filtered or unexported fields
}

BitList is a list that contains bits

func NewBitList

func NewBitList(capacity int) *BitList

NewBitList returns a new BitList with the given length all bits are initialize with false

func (*BitList) AddBit

func (bl *BitList) AddBit(bits ...bool)

AddBit appends the given bits to the end of the list

func (*BitList) AddBits

func (bl *BitList) AddBits(b int, count byte)

AddBits appends the last (LSB) 'count' bits of 'b' the the end of the list

func (*BitList) AddByte

func (bl *BitList) AddByte(b byte)

AddByte appends all 8 bits of the given byte to the end of the list

func (*BitList) GetBit

func (bl *BitList) GetBit(index int) bool

GetBit returns the bit at the given index

func (*BitList) GetBytes

func (bl *BitList) GetBytes() []byte

GetBytes returns all bits of the BitList as a []byte

func (*BitList) IterateBytes

func (bl *BitList) IterateBytes() <-chan byte

IterateBytes iterates through all bytes contained in the BitList

func (*BitList) Len

func (bl *BitList) Len() int

Len returns the number of contained bits

func (*BitList) SetBit

func (bl *BitList) SetBit(index int, value bool)

SetBit sets the bit at the given index to the given value

type GFPoly

type GFPoly struct {
	Coefficients []byte
	// contains filtered or unexported fields
}

func NewGFPoly

func NewGFPoly(field *GaloisField, coefficients []byte) *GFPoly

func NewMonominalPoly

func NewMonominalPoly(field *GaloisField, degree int, coeff byte) *GFPoly

func (*GFPoly) AddOrSubstract

func (gp *GFPoly) AddOrSubstract(other *GFPoly) *GFPoly

func (*GFPoly) Degree

func (gp *GFPoly) Degree() int

func (*GFPoly) Divide

func (gp *GFPoly) Divide(other *GFPoly) (quotient *GFPoly, remainder *GFPoly)

func (*GFPoly) GetCoefficient

func (gp *GFPoly) GetCoefficient(degree int) byte

GetCoefficient returns the coefficient of x ^ degree

func (*GFPoly) MultByMonominal

func (gp *GFPoly) MultByMonominal(degree int, coeff byte) *GFPoly

func (*GFPoly) Multiply

func (gp *GFPoly) Multiply(other *GFPoly) *GFPoly

func (*GFPoly) Zero

func (gp *GFPoly) Zero() bool

type GaloisField

type GaloisField struct {
	ALogTbl []int
	LogTbl  []int
}

GaloisField encapsulates galois field arithmetics

func NewGaloisField

func NewGaloisField(pp int) *GaloisField

NewGaloisField creates a new falois field

func (*GaloisField) AddOrSub

func (gf *GaloisField) AddOrSub(a, b int) int

AddOrSub add or substract two numbers

func (*GaloisField) Divide

func (gf *GaloisField) Divide(a, b int) int

Divide divides two numbers

func (*GaloisField) Invers

func (gf *GaloisField) Invers(num int) int

func (*GaloisField) Multiply

func (gf *GaloisField) Multiply(a, b int) int

Multiply multiplys two numbers

func (*GaloisField) Zero

func (gf *GaloisField) Zero() *GFPoly

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