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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pool
import (
"bytes"
"errors"
"io"
)
type BytesReader struct {
s []byte
i int
}
func NewBytesReader(b []byte) *BytesReader {
return &BytesReader{
s: b,
}
}
func (r *BytesReader) Reset(b []byte) {
r.s = b
r.i = 0
}
func (r *BytesReader) Buffered() int {
return len(r.s) - r.i
}
func (r *BytesReader) Bytes() []byte {
return r.s[r.i:]
}
func (r *BytesReader) Read(b []byte) (n int, err error) {
if r.i >= len(r.s) {
return 0, io.EOF
}
n = copy(b, r.s[r.i:])
r.i += n
return
}
func (r *BytesReader) ReadByte() (byte, error) {
if r.i >= len(r.s) {
return 0, io.EOF
}
b := r.s[r.i]
r.i++
return b, nil
}
func (r *BytesReader) UnreadByte() error {
if r.i <= 0 {
return errors.New("UnreadByte: at beginning of slice")
}
r.i--
return nil
}
func (r *BytesReader) ReadSlice(delim byte) ([]byte, error) {
if i := bytes.IndexByte(r.s[r.i:], delim); i >= 0 {
i++
line := r.s[r.i : r.i+i]
r.i += i
return line, nil
}
line := r.s[r.i:]
r.i = len(r.s)
return line, io.EOF
}
func (r *BytesReader) ReadBytes(fn func(byte) bool) ([]byte, error) {
for i, c := range r.s[r.i:] {
if !fn(c) {
i++
line := r.s[r.i : r.i+i]
r.i += i
return line, nil
}
}
line := r.s[r.i:]
r.i = len(r.s)
return line, io.EOF
}
func (r *BytesReader) Discard(n int) (int, error) {
b, err := r.ReadN(n)
return len(b), err
}
func (r *BytesReader) ReadN(n int) ([]byte, error) {
nn := n
if nn > len(r.s) {
nn = len(r.s)
}
b := r.s[r.i : r.i+nn]
r.i += nn
if n > nn {
return b, io.EOF
}
return b, nil
}
func (r *BytesReader) ReadFull() ([]byte, error) {
b := make([]byte, len(r.s)-r.i)
copy(b, r.s[r.i:])
r.i = len(r.s)
return b, nil
}
func (r *BytesReader) ReadFullTemp() ([]byte, error) {
b := r.s[r.i:]
r.i = len(r.s)
return b, nil
}
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