850 lines
19 KiB
Go
850 lines
19 KiB
Go
// BSON library for Go
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//
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// Copyright (c) 2010-2012 - Gustavo Niemeyer <gustavo@niemeyer.net>
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// gobson - BSON library for Go.
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package bson
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import (
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"fmt"
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"math"
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"net/url"
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"reflect"
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"strconv"
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"sync"
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"time"
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)
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type decoder struct {
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in []byte
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i int
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docType reflect.Type
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}
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var typeM = reflect.TypeOf(M{})
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func newDecoder(in []byte) *decoder {
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return &decoder{in, 0, typeM}
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}
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// --------------------------------------------------------------------------
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// Some helper functions.
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func corrupted() {
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panic("Document is corrupted")
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}
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func settableValueOf(i interface{}) reflect.Value {
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v := reflect.ValueOf(i)
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sv := reflect.New(v.Type()).Elem()
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sv.Set(v)
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return sv
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}
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// --------------------------------------------------------------------------
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// Unmarshaling of documents.
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const (
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setterUnknown = iota
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setterNone
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setterType
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setterAddr
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)
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var setterStyles map[reflect.Type]int
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var setterIface reflect.Type
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var setterMutex sync.RWMutex
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func init() {
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var iface Setter
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setterIface = reflect.TypeOf(&iface).Elem()
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setterStyles = make(map[reflect.Type]int)
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}
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func setterStyle(outt reflect.Type) int {
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setterMutex.RLock()
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style := setterStyles[outt]
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setterMutex.RUnlock()
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if style == setterUnknown {
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setterMutex.Lock()
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defer setterMutex.Unlock()
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if outt.Implements(setterIface) {
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setterStyles[outt] = setterType
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} else if reflect.PtrTo(outt).Implements(setterIface) {
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setterStyles[outt] = setterAddr
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} else {
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setterStyles[outt] = setterNone
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}
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style = setterStyles[outt]
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}
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return style
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}
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func getSetter(outt reflect.Type, out reflect.Value) Setter {
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style := setterStyle(outt)
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if style == setterNone {
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return nil
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}
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if style == setterAddr {
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if !out.CanAddr() {
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return nil
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}
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out = out.Addr()
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} else if outt.Kind() == reflect.Ptr && out.IsNil() {
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out.Set(reflect.New(outt.Elem()))
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}
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return out.Interface().(Setter)
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}
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func clearMap(m reflect.Value) {
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var none reflect.Value
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for _, k := range m.MapKeys() {
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m.SetMapIndex(k, none)
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}
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}
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func (d *decoder) readDocTo(out reflect.Value) {
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var elemType reflect.Type
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outt := out.Type()
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outk := outt.Kind()
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for {
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if outk == reflect.Ptr && out.IsNil() {
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out.Set(reflect.New(outt.Elem()))
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}
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if setter := getSetter(outt, out); setter != nil {
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var raw Raw
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d.readDocTo(reflect.ValueOf(&raw))
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err := setter.SetBSON(raw)
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if _, ok := err.(*TypeError); err != nil && !ok {
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panic(err)
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}
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return
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}
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if outk == reflect.Ptr {
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out = out.Elem()
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outt = out.Type()
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outk = out.Kind()
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continue
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}
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break
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}
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var fieldsMap map[string]fieldInfo
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var inlineMap reflect.Value
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start := d.i
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origout := out
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if outk == reflect.Interface {
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if d.docType.Kind() == reflect.Map {
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mv := reflect.MakeMap(d.docType)
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out.Set(mv)
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out = mv
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} else {
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dv := reflect.New(d.docType).Elem()
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out.Set(dv)
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out = dv
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}
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outt = out.Type()
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outk = outt.Kind()
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}
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docType := d.docType
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keyType := typeString
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convertKey := false
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switch outk {
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case reflect.Map:
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keyType = outt.Key()
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if keyType.Kind() != reflect.String {
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panic("BSON map must have string keys. Got: " + outt.String())
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}
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if keyType != typeString {
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convertKey = true
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}
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elemType = outt.Elem()
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if elemType == typeIface {
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d.docType = outt
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}
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if out.IsNil() {
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out.Set(reflect.MakeMap(out.Type()))
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} else if out.Len() > 0 {
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clearMap(out)
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}
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case reflect.Struct:
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if outt != typeRaw {
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sinfo, err := getStructInfo(out.Type())
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if err != nil {
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panic(err)
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}
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fieldsMap = sinfo.FieldsMap
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out.Set(sinfo.Zero)
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if sinfo.InlineMap != -1 {
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inlineMap = out.Field(sinfo.InlineMap)
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if !inlineMap.IsNil() && inlineMap.Len() > 0 {
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clearMap(inlineMap)
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}
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elemType = inlineMap.Type().Elem()
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if elemType == typeIface {
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d.docType = inlineMap.Type()
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}
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}
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}
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case reflect.Slice:
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switch outt.Elem() {
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case typeDocElem:
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origout.Set(d.readDocElems(outt))
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return
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case typeRawDocElem:
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origout.Set(d.readRawDocElems(outt))
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return
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}
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fallthrough
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default:
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panic("Unsupported document type for unmarshalling: " + out.Type().String())
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}
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end := int(d.readInt32())
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end += d.i - 4
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if end <= d.i || end > len(d.in) || d.in[end-1] != '\x00' {
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corrupted()
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}
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for d.in[d.i] != '\x00' {
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kind := d.readByte()
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name := d.readCStr()
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if d.i >= end {
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corrupted()
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}
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switch outk {
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case reflect.Map:
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e := reflect.New(elemType).Elem()
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if d.readElemTo(e, kind) {
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k := reflect.ValueOf(name)
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if convertKey {
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k = k.Convert(keyType)
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}
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out.SetMapIndex(k, e)
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}
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case reflect.Struct:
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if outt == typeRaw {
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d.dropElem(kind)
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} else {
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if info, ok := fieldsMap[name]; ok {
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if info.Inline == nil {
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d.readElemTo(out.Field(info.Num), kind)
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} else {
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d.readElemTo(out.FieldByIndex(info.Inline), kind)
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}
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} else if inlineMap.IsValid() {
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if inlineMap.IsNil() {
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inlineMap.Set(reflect.MakeMap(inlineMap.Type()))
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}
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e := reflect.New(elemType).Elem()
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if d.readElemTo(e, kind) {
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inlineMap.SetMapIndex(reflect.ValueOf(name), e)
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}
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} else {
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d.dropElem(kind)
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}
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}
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case reflect.Slice:
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}
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if d.i >= end {
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corrupted()
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}
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}
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d.i++ // '\x00'
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if d.i != end {
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corrupted()
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}
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d.docType = docType
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if outt == typeRaw {
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out.Set(reflect.ValueOf(Raw{0x03, d.in[start:d.i]}))
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}
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}
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func (d *decoder) readArrayDocTo(out reflect.Value) {
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end := int(d.readInt32())
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end += d.i - 4
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if end <= d.i || end > len(d.in) || d.in[end-1] != '\x00' {
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corrupted()
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}
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i := 0
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l := out.Len()
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for d.in[d.i] != '\x00' {
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if i >= l {
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panic("Length mismatch on array field")
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}
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kind := d.readByte()
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for d.i < end && d.in[d.i] != '\x00' {
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d.i++
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}
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if d.i >= end {
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corrupted()
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}
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d.i++
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d.readElemTo(out.Index(i), kind)
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if d.i >= end {
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corrupted()
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}
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i++
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}
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if i != l {
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panic("Length mismatch on array field")
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}
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d.i++ // '\x00'
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if d.i != end {
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corrupted()
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}
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}
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func (d *decoder) readSliceDoc(t reflect.Type) interface{} {
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tmp := make([]reflect.Value, 0, 8)
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elemType := t.Elem()
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if elemType == typeRawDocElem {
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d.dropElem(0x04)
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return reflect.Zero(t).Interface()
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}
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end := int(d.readInt32())
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end += d.i - 4
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if end <= d.i || end > len(d.in) || d.in[end-1] != '\x00' {
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corrupted()
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}
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for d.in[d.i] != '\x00' {
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kind := d.readByte()
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for d.i < end && d.in[d.i] != '\x00' {
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d.i++
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}
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if d.i >= end {
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corrupted()
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}
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d.i++
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e := reflect.New(elemType).Elem()
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if d.readElemTo(e, kind) {
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tmp = append(tmp, e)
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}
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if d.i >= end {
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corrupted()
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}
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}
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d.i++ // '\x00'
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if d.i != end {
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corrupted()
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}
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n := len(tmp)
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slice := reflect.MakeSlice(t, n, n)
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for i := 0; i != n; i++ {
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slice.Index(i).Set(tmp[i])
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}
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return slice.Interface()
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}
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var typeSlice = reflect.TypeOf([]interface{}{})
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var typeIface = typeSlice.Elem()
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func (d *decoder) readDocElems(typ reflect.Type) reflect.Value {
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docType := d.docType
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d.docType = typ
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slice := make([]DocElem, 0, 8)
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d.readDocWith(func(kind byte, name string) {
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e := DocElem{Name: name}
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v := reflect.ValueOf(&e.Value)
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if d.readElemTo(v.Elem(), kind) {
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slice = append(slice, e)
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}
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})
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slicev := reflect.New(typ).Elem()
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slicev.Set(reflect.ValueOf(slice))
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d.docType = docType
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return slicev
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}
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func (d *decoder) readRawDocElems(typ reflect.Type) reflect.Value {
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docType := d.docType
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d.docType = typ
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slice := make([]RawDocElem, 0, 8)
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d.readDocWith(func(kind byte, name string) {
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e := RawDocElem{Name: name}
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v := reflect.ValueOf(&e.Value)
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if d.readElemTo(v.Elem(), kind) {
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slice = append(slice, e)
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}
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})
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slicev := reflect.New(typ).Elem()
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slicev.Set(reflect.ValueOf(slice))
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d.docType = docType
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return slicev
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}
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func (d *decoder) readDocWith(f func(kind byte, name string)) {
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end := int(d.readInt32())
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end += d.i - 4
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if end <= d.i || end > len(d.in) || d.in[end-1] != '\x00' {
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corrupted()
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}
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for d.in[d.i] != '\x00' {
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kind := d.readByte()
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name := d.readCStr()
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if d.i >= end {
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corrupted()
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}
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f(kind, name)
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if d.i >= end {
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corrupted()
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}
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}
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d.i++ // '\x00'
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if d.i != end {
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corrupted()
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}
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}
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// --------------------------------------------------------------------------
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// Unmarshaling of individual elements within a document.
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var blackHole = settableValueOf(struct{}{})
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func (d *decoder) dropElem(kind byte) {
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d.readElemTo(blackHole, kind)
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}
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// Attempt to decode an element from the document and put it into out.
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// If the types are not compatible, the returned ok value will be
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// false and out will be unchanged.
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func (d *decoder) readElemTo(out reflect.Value, kind byte) (good bool) {
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start := d.i
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if kind == 0x03 {
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// Delegate unmarshaling of documents.
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outt := out.Type()
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outk := out.Kind()
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switch outk {
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case reflect.Interface, reflect.Ptr, reflect.Struct, reflect.Map:
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d.readDocTo(out)
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return true
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}
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if setterStyle(outt) != setterNone {
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d.readDocTo(out)
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return true
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}
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if outk == reflect.Slice {
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switch outt.Elem() {
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case typeDocElem:
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out.Set(d.readDocElems(outt))
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case typeRawDocElem:
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out.Set(d.readRawDocElems(outt))
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default:
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d.readDocTo(blackHole)
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}
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return true
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}
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d.readDocTo(blackHole)
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return true
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}
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var in interface{}
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switch kind {
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case 0x01: // Float64
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in = d.readFloat64()
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case 0x02: // UTF-8 string
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in = d.readStr()
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case 0x03: // Document
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panic("Can't happen. Handled above.")
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case 0x04: // Array
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outt := out.Type()
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if setterStyle(outt) != setterNone {
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// Skip the value so its data is handed to the setter below.
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d.dropElem(kind)
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break
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}
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for outt.Kind() == reflect.Ptr {
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outt = outt.Elem()
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}
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switch outt.Kind() {
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case reflect.Array:
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d.readArrayDocTo(out)
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return true
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case reflect.Slice:
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in = d.readSliceDoc(outt)
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default:
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in = d.readSliceDoc(typeSlice)
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}
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case 0x05: // Binary
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b := d.readBinary()
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if b.Kind == 0x00 || b.Kind == 0x02 {
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in = b.Data
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} else {
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in = b
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}
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case 0x06: // Undefined (obsolete, but still seen in the wild)
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in = Undefined
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case 0x07: // ObjectId
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in = ObjectId(d.readBytes(12))
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case 0x08: // Bool
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in = d.readBool()
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case 0x09: // Timestamp
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// MongoDB handles timestamps as milliseconds.
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i := d.readInt64()
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if i == -62135596800000 {
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in = time.Time{} // In UTC for convenience.
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} else {
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in = time.Unix(i/1e3, i%1e3*1e6)
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}
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case 0x0A: // Nil
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in = nil
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case 0x0B: // RegEx
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in = d.readRegEx()
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case 0x0C:
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in = DBPointer{Namespace: d.readStr(), Id: ObjectId(d.readBytes(12))}
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case 0x0D: // JavaScript without scope
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in = JavaScript{Code: d.readStr()}
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case 0x0E: // Symbol
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in = Symbol(d.readStr())
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case 0x0F: // JavaScript with scope
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d.i += 4 // Skip length
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js := JavaScript{d.readStr(), make(M)}
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d.readDocTo(reflect.ValueOf(js.Scope))
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in = js
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case 0x10: // Int32
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in = int(d.readInt32())
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case 0x11: // Mongo-specific timestamp
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in = MongoTimestamp(d.readInt64())
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case 0x12: // Int64
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in = d.readInt64()
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case 0x13: // Decimal128
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in = Decimal128{
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l: uint64(d.readInt64()),
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h: uint64(d.readInt64()),
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}
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case 0x7F: // Max key
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in = MaxKey
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case 0xFF: // Min key
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in = MinKey
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default:
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panic(fmt.Sprintf("Unknown element kind (0x%02X)", kind))
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}
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|
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outt := out.Type()
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|
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if outt == typeRaw {
|
|
out.Set(reflect.ValueOf(Raw{kind, d.in[start:d.i]}))
|
|
return true
|
|
}
|
|
|
|
if setter := getSetter(outt, out); setter != nil {
|
|
err := setter.SetBSON(Raw{kind, d.in[start:d.i]})
|
|
if err == SetZero {
|
|
out.Set(reflect.Zero(outt))
|
|
return true
|
|
}
|
|
if err == nil {
|
|
return true
|
|
}
|
|
if _, ok := err.(*TypeError); !ok {
|
|
panic(err)
|
|
}
|
|
return false
|
|
}
|
|
|
|
if in == nil {
|
|
out.Set(reflect.Zero(outt))
|
|
return true
|
|
}
|
|
|
|
outk := outt.Kind()
|
|
|
|
// Dereference and initialize pointer if necessary.
|
|
first := true
|
|
for outk == reflect.Ptr {
|
|
if !out.IsNil() {
|
|
out = out.Elem()
|
|
} else {
|
|
elem := reflect.New(outt.Elem())
|
|
if first {
|
|
// Only set if value is compatible.
|
|
first = false
|
|
defer func(out, elem reflect.Value) {
|
|
if good {
|
|
out.Set(elem)
|
|
}
|
|
}(out, elem)
|
|
} else {
|
|
out.Set(elem)
|
|
}
|
|
out = elem
|
|
}
|
|
outt = out.Type()
|
|
outk = outt.Kind()
|
|
}
|
|
|
|
inv := reflect.ValueOf(in)
|
|
if outt == inv.Type() {
|
|
out.Set(inv)
|
|
return true
|
|
}
|
|
|
|
switch outk {
|
|
case reflect.Interface:
|
|
out.Set(inv)
|
|
return true
|
|
case reflect.String:
|
|
switch inv.Kind() {
|
|
case reflect.String:
|
|
out.SetString(inv.String())
|
|
return true
|
|
case reflect.Slice:
|
|
if b, ok := in.([]byte); ok {
|
|
out.SetString(string(b))
|
|
return true
|
|
}
|
|
case reflect.Int, reflect.Int64:
|
|
if outt == typeJSONNumber {
|
|
out.SetString(strconv.FormatInt(inv.Int(), 10))
|
|
return true
|
|
}
|
|
case reflect.Float64:
|
|
if outt == typeJSONNumber {
|
|
out.SetString(strconv.FormatFloat(inv.Float(), 'f', -1, 64))
|
|
return true
|
|
}
|
|
}
|
|
case reflect.Slice, reflect.Array:
|
|
// Remember, array (0x04) slices are built with the correct
|
|
// element type. If we are here, must be a cross BSON kind
|
|
// conversion (e.g. 0x05 unmarshalling on string).
|
|
if outt.Elem().Kind() != reflect.Uint8 {
|
|
break
|
|
}
|
|
switch inv.Kind() {
|
|
case reflect.String:
|
|
slice := []byte(inv.String())
|
|
out.Set(reflect.ValueOf(slice))
|
|
return true
|
|
case reflect.Slice:
|
|
switch outt.Kind() {
|
|
case reflect.Array:
|
|
reflect.Copy(out, inv)
|
|
case reflect.Slice:
|
|
out.SetBytes(inv.Bytes())
|
|
}
|
|
return true
|
|
}
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
switch inv.Kind() {
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
out.SetInt(inv.Int())
|
|
return true
|
|
case reflect.Float32, reflect.Float64:
|
|
out.SetInt(int64(inv.Float()))
|
|
return true
|
|
case reflect.Bool:
|
|
if inv.Bool() {
|
|
out.SetInt(1)
|
|
} else {
|
|
out.SetInt(0)
|
|
}
|
|
return true
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
panic("can't happen: no uint types in BSON (!?)")
|
|
}
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
switch inv.Kind() {
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
out.SetUint(uint64(inv.Int()))
|
|
return true
|
|
case reflect.Float32, reflect.Float64:
|
|
out.SetUint(uint64(inv.Float()))
|
|
return true
|
|
case reflect.Bool:
|
|
if inv.Bool() {
|
|
out.SetUint(1)
|
|
} else {
|
|
out.SetUint(0)
|
|
}
|
|
return true
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
panic("Can't happen. No uint types in BSON.")
|
|
}
|
|
case reflect.Float32, reflect.Float64:
|
|
switch inv.Kind() {
|
|
case reflect.Float32, reflect.Float64:
|
|
out.SetFloat(inv.Float())
|
|
return true
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
out.SetFloat(float64(inv.Int()))
|
|
return true
|
|
case reflect.Bool:
|
|
if inv.Bool() {
|
|
out.SetFloat(1)
|
|
} else {
|
|
out.SetFloat(0)
|
|
}
|
|
return true
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
panic("Can't happen. No uint types in BSON?")
|
|
}
|
|
case reflect.Bool:
|
|
switch inv.Kind() {
|
|
case reflect.Bool:
|
|
out.SetBool(inv.Bool())
|
|
return true
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
out.SetBool(inv.Int() != 0)
|
|
return true
|
|
case reflect.Float32, reflect.Float64:
|
|
out.SetBool(inv.Float() != 0)
|
|
return true
|
|
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
|
|
panic("Can't happen. No uint types in BSON?")
|
|
}
|
|
case reflect.Struct:
|
|
if outt == typeURL && inv.Kind() == reflect.String {
|
|
u, err := url.Parse(inv.String())
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
out.Set(reflect.ValueOf(u).Elem())
|
|
return true
|
|
}
|
|
if outt == typeBinary {
|
|
if b, ok := in.([]byte); ok {
|
|
out.Set(reflect.ValueOf(Binary{Data: b}))
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
// --------------------------------------------------------------------------
|
|
// Parsers of basic types.
|
|
|
|
func (d *decoder) readRegEx() RegEx {
|
|
re := RegEx{}
|
|
re.Pattern = d.readCStr()
|
|
re.Options = d.readCStr()
|
|
return re
|
|
}
|
|
|
|
func (d *decoder) readBinary() Binary {
|
|
l := d.readInt32()
|
|
b := Binary{}
|
|
b.Kind = d.readByte()
|
|
b.Data = d.readBytes(l)
|
|
if b.Kind == 0x02 && len(b.Data) >= 4 {
|
|
// Weird obsolete format with redundant length.
|
|
b.Data = b.Data[4:]
|
|
}
|
|
return b
|
|
}
|
|
|
|
func (d *decoder) readStr() string {
|
|
l := d.readInt32()
|
|
b := d.readBytes(l - 1)
|
|
if d.readByte() != '\x00' {
|
|
corrupted()
|
|
}
|
|
return string(b)
|
|
}
|
|
|
|
func (d *decoder) readCStr() string {
|
|
start := d.i
|
|
end := start
|
|
l := len(d.in)
|
|
for ; end != l; end++ {
|
|
if d.in[end] == '\x00' {
|
|
break
|
|
}
|
|
}
|
|
d.i = end + 1
|
|
if d.i > l {
|
|
corrupted()
|
|
}
|
|
return string(d.in[start:end])
|
|
}
|
|
|
|
func (d *decoder) readBool() bool {
|
|
b := d.readByte()
|
|
if b == 0 {
|
|
return false
|
|
}
|
|
if b == 1 {
|
|
return true
|
|
}
|
|
panic(fmt.Sprintf("encoded boolean must be 1 or 0, found %d", b))
|
|
}
|
|
|
|
func (d *decoder) readFloat64() float64 {
|
|
return math.Float64frombits(uint64(d.readInt64()))
|
|
}
|
|
|
|
func (d *decoder) readInt32() int32 {
|
|
b := d.readBytes(4)
|
|
return int32((uint32(b[0]) << 0) |
|
|
(uint32(b[1]) << 8) |
|
|
(uint32(b[2]) << 16) |
|
|
(uint32(b[3]) << 24))
|
|
}
|
|
|
|
func (d *decoder) readInt64() int64 {
|
|
b := d.readBytes(8)
|
|
return int64((uint64(b[0]) << 0) |
|
|
(uint64(b[1]) << 8) |
|
|
(uint64(b[2]) << 16) |
|
|
(uint64(b[3]) << 24) |
|
|
(uint64(b[4]) << 32) |
|
|
(uint64(b[5]) << 40) |
|
|
(uint64(b[6]) << 48) |
|
|
(uint64(b[7]) << 56))
|
|
}
|
|
|
|
func (d *decoder) readByte() byte {
|
|
i := d.i
|
|
d.i++
|
|
if d.i > len(d.in) {
|
|
corrupted()
|
|
}
|
|
return d.in[i]
|
|
}
|
|
|
|
func (d *decoder) readBytes(length int32) []byte {
|
|
if length < 0 {
|
|
corrupted()
|
|
}
|
|
start := d.i
|
|
d.i += int(length)
|
|
if d.i < start || d.i > len(d.in) {
|
|
corrupted()
|
|
}
|
|
return d.in[start : start+int(length)]
|
|
}
|