mirror of
https://github.com/go-gitea/gitea
synced 2024-12-24 02:16:03 +01:00
93 lines
1.9 KiB
Go
93 lines
1.9 KiB
Go
// Copyright (c) 2017 Couchbase, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package vellum
|
|
|
|
import (
|
|
"bufio"
|
|
"io"
|
|
)
|
|
|
|
// A writer is a buffered writer used by vellum. It counts how many bytes have
|
|
// been written and has some convenience methods used for encoding the data.
|
|
type writer struct {
|
|
w *bufio.Writer
|
|
counter int
|
|
}
|
|
|
|
func newWriter(w io.Writer) *writer {
|
|
return &writer{
|
|
w: bufio.NewWriter(w),
|
|
}
|
|
}
|
|
|
|
func (w *writer) Reset(newWriter io.Writer) {
|
|
w.w.Reset(newWriter)
|
|
w.counter = 0
|
|
}
|
|
|
|
func (w *writer) WriteByte(c byte) error {
|
|
err := w.w.WriteByte(c)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
w.counter++
|
|
return nil
|
|
}
|
|
|
|
func (w *writer) Write(p []byte) (int, error) {
|
|
n, err := w.w.Write(p)
|
|
w.counter += n
|
|
return n, err
|
|
}
|
|
|
|
func (w *writer) Flush() error {
|
|
return w.w.Flush()
|
|
}
|
|
|
|
func (w *writer) WritePackedUintIn(v uint64, n int) error {
|
|
for shift := uint(0); shift < uint(n*8); shift += 8 {
|
|
err := w.WriteByte(byte(v >> shift))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (w *writer) WritePackedUint(v uint64) error {
|
|
n := packedSize(v)
|
|
return w.WritePackedUintIn(v, n)
|
|
}
|
|
|
|
func packedSize(n uint64) int {
|
|
if n < 1<<8 {
|
|
return 1
|
|
} else if n < 1<<16 {
|
|
return 2
|
|
} else if n < 1<<24 {
|
|
return 3
|
|
} else if n < 1<<32 {
|
|
return 4
|
|
} else if n < 1<<40 {
|
|
return 5
|
|
} else if n < 1<<48 {
|
|
return 6
|
|
} else if n < 1<<56 {
|
|
return 7
|
|
}
|
|
return 8
|
|
}
|