package bytes
ReadFrom reads data from input buffer until EOF and appends it to the buffer, growing the buffer as needed. The return value n is the number of bytes read. Any error except io.EOF encountered during the read is also returned. If the buffer becomes too large, ReadFrom will panic with ErrTooLarge.
Golang bytes.Buffer.ReadFrom() function usage example
package main
import (
"bytes"
"fmt"
)
func main() {
bufferA := bytes.NewBuffer([]byte("abcd"))
bufferB := bytes.NewBuffer(nil)
n, err := bufferB.ReadFrom(bufferA)
fmt.Printf("%v %s %d\n", err, string(bufferB.Bytes()), n)
}
Output :
<nil> abcd 4
Reference :
http://golang.org/pkg/bytes/#Buffer.ReadFrom
