bytealg

Documentation

Index

• Constants
• Variables
• func Compare(a, b []byte) int
• func Count(b []byte, c byte) int
• func CountString(s string, c byte) int
• func Cutover(n int) int
• func Equal(a, b []byte) bool
• func HashStr(sep string) (uint32, uint32)
• func HashStrBytes(sep []byte) (uint32, uint32)
• func HashStrRev(sep string) (uint32, uint32)
• func HashStrRevBytes(sep []byte) (uint32, uint32)
• func Index(a, b []byte) int
• func IndexByte(b []byte, c byte) int
• func IndexByteString(s string, c byte) int
• func IndexRabinKarp(s, substr string) int
• func IndexRabinKarpBytes(s, sep []byte) int
• func IndexString(a, b string) int
• func MakeNoZero(n int) []byte

Constants

const MaxBruteForce = 64

const PrimeRK = 16777619

PrimeRK is the prime base used in Rabin-Karp algorithm.

Variables

var MaxLen int

MaxLen is the maximum length of the string to be searched for (argument b) in Index. If MaxLen is not 0, make sure MaxLen >= 4.

Functions

func Compare

func Compare(a, b []byte) int

func Count

func Count(b []byte, c byte) int

func CountString

func CountString(s string, c byte) int

func Cutover

func Cutover(n int) int

Cutover reports the number of failures of IndexByte we should tolerate before switching over to Index. n is the number of bytes processed so far. See the bytes.Index implementation for details.

func Equal

func Equal(a, b []byte) bool

Equal reports whether a and b are the same length and contain the same bytes. A nil argument is equivalent to an empty slice.

Equal is equivalent to bytes.Equal. It is provided here for convenience, because some packages cannot depend on bytes.

func HashStr

func HashStr(sep string) (uint32, uint32)

HashStr returns the hash and the appropriate multiplicative factor for use in Rabin-Karp algorithm.

func HashStrBytes

func HashStrBytes(sep []byte) (uint32, uint32)

HashStrBytes returns the hash and the appropriate multiplicative factor for use in Rabin-Karp algorithm.

func HashStrRev

func HashStrRev(sep string) (uint32, uint32)

HashStrRev returns the hash of the reverse of sep and the appropriate multiplicative factor for use in Rabin-Karp algorithm.

func HashStrRevBytes

func HashStrRevBytes(sep []byte) (uint32, uint32)

HashStrRevBytes returns the hash of the reverse of sep and the appropriate multiplicative factor for use in Rabin-Karp algorithm.

func Index

func Index(a, b []byte) int

Index returns the index of the first instance of b in a, or -1 if b is not present in a. Requires 2 <= len(b) <= MaxLen.

func IndexByte

func IndexByte(b []byte, c byte) int

func IndexByteString

func IndexByteString(s string, c byte) int

func IndexRabinKarp

func IndexRabinKarp(s, substr string) int

IndexRabinKarp uses the Rabin-Karp search algorithm to return the index of the first occurrence of substr in s, or -1 if not present.

func IndexRabinKarpBytes

func IndexRabinKarpBytes(s, sep []byte) int

IndexRabinKarpBytes uses the Rabin-Karp search algorithm to return the index of the first occurrence of substr in s, or -1 if not present.

func IndexString

func IndexString(a, b string) int

IndexString returns the index of the first instance of b in a, or -1 if b is not present in a. Requires 2 <= len(b) <= MaxLen.

func MakeNoZero

func MakeNoZero(n int) []byte

MakeNoZero makes a slice of length and capacity n without zeroing the bytes. It is the caller's responsibility to ensure uninitialized bytes do not leak to the end user.