/
rowbuf.go
168 lines (140 loc) · 3.36 KB
/
rowbuf.go
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// Copyright 2015 Reborndb Org. All Rights Reserved.
// Licensed under the MIT (MIT-LICENSE.txt) license.
package store
import (
"bytes"
"encoding/binary"
"github.com/juju/errors"
"github.com/reborndb/go/bytesize"
"github.com/reborndb/go/io/ioutils"
)
var (
ErrVarbytesLen = errors.New("invalid varbytes length")
)
const (
maxVarbytesLen = bytesize.MB * 512
)
type BufReader struct {
r *bytes.Reader
}
func NewBufReader(p []byte) *BufReader {
return &BufReader{bytes.NewReader(p)}
}
func (r *BufReader) ReadByte() (byte, error) {
b, err := r.r.ReadByte()
return b, errors.Trace(err)
}
func (r *BufReader) ReadBytes(n int) ([]byte, error) {
p := make([]byte, n)
_, err := ioutils.ReadFull(r.r, p)
return p, err
}
func (r *BufReader) ReadVarint() (int64, error) {
v, err := binary.ReadVarint(r)
return v, errors.Trace(err)
}
func (r *BufReader) ReadUvarint() (uint64, error) {
u, err := binary.ReadUvarint(r)
return u, errors.Trace(err)
}
func (r *BufReader) ReadVarbytes() ([]byte, error) {
n, err := r.ReadUvarint()
if err != nil {
return nil, err
}
if n < 0 || n > maxVarbytesLen {
return nil, errors.Trace(ErrVarbytesLen)
} else if n == 0 {
return []byte{}, nil
}
return r.ReadBytes(int(n))
}
func (r *BufReader) ReadFloat64() (float64, error) {
p, err := r.ReadBytes(8)
if err != nil {
return 0, err
}
bits := binary.BigEndian.Uint64(p)
return uint64ToFloat64(bits), nil
}
func (r *BufReader) ReadInt64() (int64, error) {
p, err := r.ReadBytes(8)
if err != nil {
return 0, err
}
return int64(binary.BigEndian.Uint64(p)), nil
}
func (r *BufReader) ReadUint64() (uint64, error) {
p, err := r.ReadBytes(8)
if err != nil {
return 0, err
}
return uint64(binary.BigEndian.Uint64(p)), nil
}
func (r *BufReader) Len() int {
return r.r.Len()
}
type BufWriter struct {
w *bytes.Buffer
}
func NewBufWriter(p []byte) *BufWriter {
if p != nil {
dup := make([]byte, len(p), cap(p))
copy(dup, p)
p = dup
}
return &BufWriter{bytes.NewBuffer(p)}
}
func (w *BufWriter) WriteByte(b byte) error {
return errors.Trace(w.w.WriteByte(b))
}
func (w *BufWriter) WriteBytes(p []byte) error {
_, err := ioutils.WriteFull(w.w, p)
return err
}
func (w *BufWriter) WriteVarint(v int64) error {
p := make([]byte, binary.MaxVarintLen64)
n := binary.PutVarint(p, v)
_, err := ioutils.WriteFull(w.w, p[:n])
return err
}
func (w *BufWriter) WriteUvarint(v uint64) error {
p := make([]byte, binary.MaxVarintLen64)
n := binary.PutUvarint(p, v)
_, err := ioutils.WriteFull(w.w, p[:n])
return err
}
func (w *BufWriter) WriteVarbytes(p []byte) error {
if n := uint64(len(p)); n > maxVarbytesLen {
return errors.Trace(ErrVarbytesLen)
} else if err := w.WriteUvarint(n); err != nil {
return err
}
_, err := ioutils.WriteFull(w.w, p)
return err
}
func (w *BufWriter) WriteFloat64(f float64) error {
p := make([]byte, 8)
bits := float64ToUint64(f)
binary.BigEndian.PutUint64(p, bits)
_, err := ioutils.WriteFull(w.w, p)
return err
}
func (w *BufWriter) WriteInt64(s int64) error {
p := make([]byte, 8)
binary.BigEndian.PutUint64(p, uint64(s))
_, err := ioutils.WriteFull(w.w, p)
return err
}
func (w *BufWriter) WriteUint64(s uint64) error {
p := make([]byte, 8)
binary.BigEndian.PutUint64(p, uint64(s))
_, err := ioutils.WriteFull(w.w, p)
return err
}
func (w *BufWriter) Len() int {
return w.w.Len()
}
func (w *BufWriter) Bytes() []byte {
return w.w.Bytes()
}