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[T string | []byte](sep T) (uint32, uint32)
• func HashStrRev[T string | []byte](sep T) (uint32, uint32)
• func Index(a, b []byte) int
• func IndexByte(b []byte, c byte) int
• func IndexByteString(s string, c byte) int
• func IndexRabinKarp[T string | []byte](s, sep T) int
• func IndexString(a, b string) int
• func LastIndexByte(s []byte, c byte) int
• func LastIndexByteString(s string, c byte) int
• func LastIndexRabinKarp[T string | []byte](s, sep T) 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[T string | []byte](sep T) (uint32, uint32)

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

func HashStrRev

func HashStrRev[T string | []byte](sep T) (uint32, uint32)

HashStrRev 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[T string | []byte](s, sep T) int

IndexRabinKarp uses the Rabin-Karp search algorithm to return the index of the first occurrence of sep 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 LastIndexByte

func LastIndexByte(s []byte, c byte) int

func LastIndexByteString

func LastIndexByteString(s string, c byte) int

func LastIndexRabinKarp

func LastIndexRabinKarp[T string | []byte](s, sep T) int

LastIndexRabinKarp uses the Rabin-Karp search algorithm to return the last index of the occurrence of sep in s, or -1 if not present.

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.