utils

Documentation

Overview

Package utils contain some utilities which are needed to create barcodes

Index

• func IntToRune(i int) rune
• func New1DCode(codeKind, content string, bars *BitList, checksum int) barcode.Barcode
• func RuneToInt(r rune) int
• type BitList
  • func NewBitList(capacity int) *BitList
  • func (bl *BitList) AddBit(bits ...bool)
  • func (bl *BitList) AddBits(b int, count byte)
  • func (bl *BitList) AddByte(b byte)
  • func (bl *BitList) GetBit(index int) bool
  • func (bl *BitList) GetBytes() []byte
  • func (bl *BitList) IterateBytes() <-chan byte
  • func (bl *BitList) Len() int
  • func (bl *BitList) SetBit(index int, value bool)
• type GFPoly
  • func NewGFPoly(field *GaloisField, coefficients []byte) *GFPoly
  • func NewMonominalPoly(field *GaloisField, degree int, coeff byte) *GFPoly
  • func (gp *GFPoly) AddOrSubstract(other *GFPoly) *GFPoly
  • func (gp *GFPoly) Degree() int
  • func (gp *GFPoly) Divide(other *GFPoly) (quotient *GFPoly, remainder *GFPoly)
  • func (gp *GFPoly) GetCoefficient(degree int) byte
  • func (gp *GFPoly) MultByMonominal(degree int, coeff byte) *GFPoly
  • func (gp *GFPoly) Multiply(other *GFPoly) *GFPoly
  • func (gp *GFPoly) Zero() bool
• type GaloisField
  • func NewGaloisField(pp int) *GaloisField
  • func (gf *GaloisField) AddOrSub(a, b int) int
  • func (gf *GaloisField) Divide(a, b int) int
  • func (gf *GaloisField) Invers(num int) int
  • func (gf *GaloisField) Multiply(a, b int) int
  • func (gf *GaloisField) Zero() *GFPoly

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