github.com/maeglindeveloper/gqlgen@v0.13.1-0.20210413081235-57808b12a0a0/graphql/handler/transport/reader.go (about)

     1  package transport
     2  
     3  import (
     4  	"errors"
     5  	"io"
     6  )
     7  
     8  type bytesReader struct {
     9  	s        *[]byte
    10  	i        int64 // current reading index
    11  	prevRune int   // index of previous rune; or < 0
    12  }
    13  
    14  func (r *bytesReader) Read(b []byte) (n int, err error) {
    15  	if r.s == nil {
    16  		return 0, errors.New("byte slice pointer is nil")
    17  	}
    18  	if r.i >= int64(len(*r.s)) {
    19  		return 0, io.EOF
    20  	}
    21  	r.prevRune = -1
    22  	n = copy(b, (*r.s)[r.i:])
    23  	r.i += int64(n)
    24  	return
    25  }