decode fixed-width data (original) (raw)

Fixedwidth

Fixedwidth is a Go package that provides a simple way to define fixed-width data, fast encoding and decoding also is the project's target.

UTF-8

To start using Fixedwidth, run go get:

$ go get github.com/huydang284/fixedwidth

To limit a struct field, we use fixed tag.

Example:

type people struct { Name string fixed:"10" Age int fixed:"3" }

If the value of struct field is longer than the limit that we defined, redundant characters will be truncated.

Otherwise, if the value of struct field is less than the limit, additional spaces will be appended.

We can use Marshal function directly to encode fixed-width data.

package main

import ( "fmt" "github.com/huydang284/fixedwidth" )

type people struct { Name string fixed:"10" Age int fixed:"3" }

func main() { me := people { Name: "Huy", Age: 25, } data, _ := fixedwidth.Marshal(me) fmt.Println(string(data)) }

The result will be:

For decoding, we use Unmarshal.

package main

import ( "fmt" "github.com/huydang284/fixedwidth" )

type people struct { Name string fixed:"10" Age int fixed:"3" }

func main() { var me people data := []byte("Huy 25 ") fixedwidth.Unmarshal(data, &me) fmt.Printf("%+v", me) }

The result will be:

Fixedwidth source code is available under the MIT License.