jan/crc16
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Documentation, v0.1.1

Browse Source
This commit is contained in:
Jan Barfuss 2025-01-12 11:07:53 +01:00
parent c0f80d1177
commit a670238712
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
crc.go
View File

@ -1,13 +1,19 @@
// CRC16 implements the CRC-16-CCITT algorithm.
// The polynomial is 0x1021.
// It accepts a byte slice and returns a 16-bit checksum.
package crc16 package crc16
var Crc16Table = make([]uint16, 256) var Crc16Table = make([]uint16, 256)
// GeneratorPolynomial is the polynomial used in the CRC-16-CCITT algorithm.
const GeneratorPolynomial = 0x1021 const GeneratorPolynomial = 0x1021
func init() { func init() {
calculateTable() calculateTable()
} }
// calculateTable computes the CRC-16 lookup table.
// The table is used to speed up the CRC calculation.
func calculateTable() { func calculateTable() {
for dividend := 0; dividend < 256; dividend++ { for dividend := 0; dividend < 256; dividend++ {
crc := uint16(dividend << 8) crc := uint16(dividend << 8)
@ -22,6 +28,8 @@ func calculateTable() {
} }
} }
// Calculates generates a CRC-16 checksum for the given data.
// It accepts a byte slice and returns a 16-bit checksum.
func Calculate(data []byte) uint16 { func Calculate(data []byte) uint16 {
crc := uint16(0) crc := uint16(0)
for _, b := range data { for _, b := range data {