1423 lines
34 KiB
Go
1423 lines
34 KiB
Go
// Copyright (c) 2012-2018 Ugorji Nwoke. All rights reserved.
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// Use of this source code is governed by a MIT license found in the LICENSE file.
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package codec
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// By default, this json support uses base64 encoding for bytes, because you cannot
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// store and read any arbitrary string in json (only unicode).
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// However, the user can configre how to encode/decode bytes.
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//
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// This library specifically supports UTF-8 for encoding and decoding only.
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//
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// Note that the library will happily encode/decode things which are not valid
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// json e.g. a map[int64]string. We do it for consistency. With valid json,
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// we will encode and decode appropriately.
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// Users can specify their map type if necessary to force it.
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//
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// Note:
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// - we cannot use strconv.Quote and strconv.Unquote because json quotes/unquotes differently.
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// We implement it here.
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// Top-level methods of json(End|Dec)Driver (which are implementations of (en|de)cDriver
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// MUST not call one-another.
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import (
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"bytes"
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"encoding/base64"
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"math"
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"reflect"
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"strconv"
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"time"
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"unicode"
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"unicode/utf16"
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"unicode/utf8"
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)
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//--------------------------------
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var jsonLiterals = [...]byte{
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'"', 't', 'r', 'u', 'e', '"',
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'"', 'f', 'a', 'l', 's', 'e', '"',
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'"', 'n', 'u', 'l', 'l', '"',
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}
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const (
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jsonLitTrueQ = 0
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jsonLitTrue = 1
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jsonLitFalseQ = 6
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jsonLitFalse = 7
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jsonLitNullQ = 13
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jsonLitNull = 14
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)
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const (
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jsonU4Chk2 = '0'
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jsonU4Chk1 = 'a' - 10
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jsonU4Chk0 = 'A' - 10
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jsonScratchArrayLen = 64
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)
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const (
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// If !jsonValidateSymbols, decoding will be faster, by skipping some checks:
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// - If we see first character of null, false or true,
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// do not validate subsequent characters.
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// - e.g. if we see a n, assume null and skip next 3 characters,
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// and do not validate they are ull.
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// P.S. Do not expect a significant decoding boost from this.
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jsonValidateSymbols = true
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jsonSpacesOrTabsLen = 128
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jsonAlwaysReturnInternString = false
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)
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var (
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// jsonTabs and jsonSpaces are used as caches for indents
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jsonTabs, jsonSpaces [jsonSpacesOrTabsLen]byte
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jsonCharHtmlSafeSet bitset128
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jsonCharSafeSet bitset128
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jsonCharWhitespaceSet bitset256
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jsonNumSet bitset256
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)
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func init() {
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for i := 0; i < jsonSpacesOrTabsLen; i++ {
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jsonSpaces[i] = ' '
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jsonTabs[i] = '\t'
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}
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// populate the safe values as true: note: ASCII control characters are (0-31)
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// jsonCharSafeSet: all true except (0-31) " \
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// jsonCharHtmlSafeSet: all true except (0-31) " \ < > &
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var i byte
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for i = 32; i < utf8.RuneSelf; i++ {
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switch i {
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case '"', '\\':
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case '<', '>', '&':
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jsonCharSafeSet.set(i) // = true
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default:
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jsonCharSafeSet.set(i)
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jsonCharHtmlSafeSet.set(i)
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}
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}
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for i = 0; i <= utf8.RuneSelf; i++ {
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switch i {
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case ' ', '\t', '\r', '\n':
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jsonCharWhitespaceSet.set(i)
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case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'e', 'E', '.', '+', '-':
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jsonNumSet.set(i)
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}
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}
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}
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// ----------------
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type jsonEncDriverTypical struct {
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w encWriter
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// w *encWriterSwitch
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b *[jsonScratchArrayLen]byte
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tw bool // term white space
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c containerState
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}
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func (e *jsonEncDriverTypical) typical() {}
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func (e *jsonEncDriverTypical) reset(ee *jsonEncDriver) {
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e.w = ee.ew
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// e.w = &ee.e.encWriterSwitch
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e.b = &ee.b
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e.tw = ee.h.TermWhitespace
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e.c = 0
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}
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func (e *jsonEncDriverTypical) WriteArrayStart(length int) {
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e.w.writen1('[')
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e.c = containerArrayStart
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}
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func (e *jsonEncDriverTypical) WriteArrayElem() {
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if e.c != containerArrayStart {
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e.w.writen1(',')
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}
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e.c = containerArrayElem
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}
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func (e *jsonEncDriverTypical) WriteArrayEnd() {
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e.w.writen1(']')
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e.c = containerArrayEnd
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}
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func (e *jsonEncDriverTypical) WriteMapStart(length int) {
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e.w.writen1('{')
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e.c = containerMapStart
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}
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func (e *jsonEncDriverTypical) WriteMapElemKey() {
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if e.c != containerMapStart {
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e.w.writen1(',')
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}
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e.c = containerMapKey
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}
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func (e *jsonEncDriverTypical) WriteMapElemValue() {
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e.w.writen1(':')
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e.c = containerMapValue
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}
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func (e *jsonEncDriverTypical) WriteMapEnd() {
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e.w.writen1('}')
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e.c = containerMapEnd
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}
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func (e *jsonEncDriverTypical) EncodeBool(b bool) {
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if b {
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e.w.writeb(jsonLiterals[jsonLitTrue : jsonLitTrue+4])
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} else {
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e.w.writeb(jsonLiterals[jsonLitFalse : jsonLitFalse+5])
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}
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}
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func (e *jsonEncDriverTypical) EncodeFloat64(f float64) {
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fmt, prec := jsonFloatStrconvFmtPrec(f)
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e.w.writeb(strconv.AppendFloat(e.b[:0], f, fmt, prec, 64))
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}
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func (e *jsonEncDriverTypical) EncodeInt(v int64) {
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e.w.writeb(strconv.AppendInt(e.b[:0], v, 10))
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}
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func (e *jsonEncDriverTypical) EncodeUint(v uint64) {
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e.w.writeb(strconv.AppendUint(e.b[:0], v, 10))
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}
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func (e *jsonEncDriverTypical) EncodeFloat32(f float32) {
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e.EncodeFloat64(float64(f))
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}
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func (e *jsonEncDriverTypical) atEndOfEncode() {
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if e.tw {
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e.w.writen1(' ')
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}
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}
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// ----------------
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type jsonEncDriverGeneric struct {
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w encWriter // encWriter // *encWriterSwitch
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b *[jsonScratchArrayLen]byte
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c containerState
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// ds string // indent string
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di int8 // indent per
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d bool // indenting?
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dt bool // indent using tabs
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dl uint16 // indent level
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ks bool // map key as string
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is byte // integer as string
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tw bool // term white space
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_ [7]byte // padding
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}
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// indent is done as below:
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// - newline and indent are added before each mapKey or arrayElem
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// - newline and indent are added before each ending,
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// except there was no entry (so we can have {} or [])
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func (e *jsonEncDriverGeneric) reset(ee *jsonEncDriver) {
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e.w = ee.ew
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e.b = &ee.b
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e.tw = ee.h.TermWhitespace
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e.c = 0
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e.d, e.dt, e.dl, e.di = false, false, 0, 0
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h := ee.h
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if h.Indent > 0 {
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e.d = true
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e.di = int8(h.Indent)
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} else if h.Indent < 0 {
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e.d = true
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e.dt = true
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e.di = int8(-h.Indent)
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}
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e.ks = h.MapKeyAsString
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e.is = h.IntegerAsString
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}
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func (e *jsonEncDriverGeneric) WriteArrayStart(length int) {
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if e.d {
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e.dl++
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}
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e.w.writen1('[')
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e.c = containerArrayStart
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}
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func (e *jsonEncDriverGeneric) WriteArrayElem() {
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if e.c != containerArrayStart {
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e.w.writen1(',')
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}
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if e.d {
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e.writeIndent()
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}
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e.c = containerArrayElem
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}
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func (e *jsonEncDriverGeneric) WriteArrayEnd() {
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if e.d {
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e.dl--
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if e.c != containerArrayStart {
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e.writeIndent()
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}
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}
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e.w.writen1(']')
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e.c = containerArrayEnd
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}
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func (e *jsonEncDriverGeneric) WriteMapStart(length int) {
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if e.d {
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e.dl++
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}
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e.w.writen1('{')
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e.c = containerMapStart
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}
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func (e *jsonEncDriverGeneric) WriteMapElemKey() {
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if e.c != containerMapStart {
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e.w.writen1(',')
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}
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if e.d {
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e.writeIndent()
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}
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e.c = containerMapKey
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}
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func (e *jsonEncDriverGeneric) WriteMapElemValue() {
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if e.d {
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e.w.writen2(':', ' ')
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} else {
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e.w.writen1(':')
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}
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e.c = containerMapValue
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}
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func (e *jsonEncDriverGeneric) WriteMapEnd() {
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if e.d {
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e.dl--
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if e.c != containerMapStart {
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e.writeIndent()
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}
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}
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e.w.writen1('}')
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e.c = containerMapEnd
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}
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func (e *jsonEncDriverGeneric) writeIndent() {
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e.w.writen1('\n')
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x := int(e.di) * int(e.dl)
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if e.dt {
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for x > jsonSpacesOrTabsLen {
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e.w.writeb(jsonTabs[:])
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x -= jsonSpacesOrTabsLen
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}
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e.w.writeb(jsonTabs[:x])
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} else {
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for x > jsonSpacesOrTabsLen {
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e.w.writeb(jsonSpaces[:])
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x -= jsonSpacesOrTabsLen
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}
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e.w.writeb(jsonSpaces[:x])
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}
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}
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func (e *jsonEncDriverGeneric) EncodeBool(b bool) {
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if e.ks && e.c == containerMapKey {
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if b {
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e.w.writeb(jsonLiterals[jsonLitTrueQ : jsonLitTrueQ+6])
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} else {
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e.w.writeb(jsonLiterals[jsonLitFalseQ : jsonLitFalseQ+7])
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}
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} else {
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if b {
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e.w.writeb(jsonLiterals[jsonLitTrue : jsonLitTrue+4])
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} else {
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e.w.writeb(jsonLiterals[jsonLitFalse : jsonLitFalse+5])
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}
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}
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}
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func (e *jsonEncDriverGeneric) EncodeFloat64(f float64) {
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// instead of using 'g', specify whether to use 'e' or 'f'
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fmt, prec := jsonFloatStrconvFmtPrec(f)
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var blen int
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if e.ks && e.c == containerMapKey {
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blen = 2 + len(strconv.AppendFloat(e.b[1:1], f, fmt, prec, 64))
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e.b[0] = '"'
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e.b[blen-1] = '"'
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} else {
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blen = len(strconv.AppendFloat(e.b[:0], f, fmt, prec, 64))
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}
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e.w.writeb(e.b[:blen])
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}
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func (e *jsonEncDriverGeneric) EncodeInt(v int64) {
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x := e.is
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if x == 'A' || x == 'L' && (v > 1<<53 || v < -(1<<53)) || (e.ks && e.c == containerMapKey) {
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blen := 2 + len(strconv.AppendInt(e.b[1:1], v, 10))
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e.b[0] = '"'
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e.b[blen-1] = '"'
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e.w.writeb(e.b[:blen])
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return
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}
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e.w.writeb(strconv.AppendInt(e.b[:0], v, 10))
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}
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func (e *jsonEncDriverGeneric) EncodeUint(v uint64) {
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x := e.is
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if x == 'A' || x == 'L' && v > 1<<53 || (e.ks && e.c == containerMapKey) {
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blen := 2 + len(strconv.AppendUint(e.b[1:1], v, 10))
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e.b[0] = '"'
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e.b[blen-1] = '"'
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e.w.writeb(e.b[:blen])
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return
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}
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e.w.writeb(strconv.AppendUint(e.b[:0], v, 10))
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}
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func (e *jsonEncDriverGeneric) EncodeFloat32(f float32) {
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// e.encodeFloat(float64(f), 32)
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// always encode all floats as IEEE 64-bit floating point.
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// It also ensures that we can decode in full precision even if into a float32,
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// as what is written is always to float64 precision.
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e.EncodeFloat64(float64(f))
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}
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func (e *jsonEncDriverGeneric) atEndOfEncode() {
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if e.tw {
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if e.d {
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e.w.writen1('\n')
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} else {
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e.w.writen1(' ')
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}
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}
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}
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// --------------------
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type jsonEncDriver struct {
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noBuiltInTypes
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e *Encoder
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h *JsonHandle
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ew encWriter // encWriter // *encWriterSwitch
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se extWrapper
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// ---- cpu cache line boundary?
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bs []byte // scratch
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// ---- cpu cache line boundary?
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b [jsonScratchArrayLen]byte // scratch (encode time,
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}
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func (e *jsonEncDriver) EncodeNil() {
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// We always encode nil as just null (never in quotes)
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// This allows us to easily decode if a nil in the json stream
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// ie if initial token is n.
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e.ew.writeb(jsonLiterals[jsonLitNull : jsonLitNull+4])
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// if e.h.MapKeyAsString && e.c == containerMapKey {
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// e.ew.writeb(jsonLiterals[jsonLitNullQ : jsonLitNullQ+6])
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// } else {
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// e.ew.writeb(jsonLiterals[jsonLitNull : jsonLitNull+4])
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// }
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}
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func (e *jsonEncDriver) EncodeTime(t time.Time) {
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// Do NOT use MarshalJSON, as it allocates internally.
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// instead, we call AppendFormat directly, using our scratch buffer (e.b)
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if t.IsZero() {
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e.EncodeNil()
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} else {
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e.b[0] = '"'
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b := t.AppendFormat(e.b[1:1], time.RFC3339Nano)
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e.b[len(b)+1] = '"'
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e.ew.writeb(e.b[:len(b)+2])
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}
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// v, err := t.MarshalJSON(); if err != nil { e.e.error(err) } e.ew.writeb(v)
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}
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func (e *jsonEncDriver) EncodeExt(rv interface{}, xtag uint64, ext Ext, en *Encoder) {
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if v := ext.ConvertExt(rv); v == nil {
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e.EncodeNil()
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} else {
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en.encode(v)
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}
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}
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func (e *jsonEncDriver) EncodeRawExt(re *RawExt, en *Encoder) {
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// only encodes re.Value (never re.Data)
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if re.Value == nil {
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e.EncodeNil()
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} else {
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en.encode(re.Value)
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}
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}
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func (e *jsonEncDriver) EncodeString(c charEncoding, v string) {
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e.quoteStr(v)
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}
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func (e *jsonEncDriver) EncodeStringBytes(c charEncoding, v []byte) {
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// if encoding raw bytes and RawBytesExt is configured, use it to encode
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if v == nil {
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e.EncodeNil()
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return
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}
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if c == cRAW {
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if e.se.InterfaceExt != nil {
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e.EncodeExt(v, 0, &e.se, e.e)
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return
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}
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slen := base64.StdEncoding.EncodedLen(len(v))
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if cap(e.bs) >= slen+2 {
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e.bs = e.bs[:slen+2]
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} else {
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e.bs = make([]byte, slen+2)
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}
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e.bs[0] = '"'
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base64.StdEncoding.Encode(e.bs[1:], v)
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e.bs[slen+1] = '"'
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e.ew.writeb(e.bs)
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} else {
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e.quoteStr(stringView(v))
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}
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}
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func (e *jsonEncDriver) EncodeAsis(v []byte) {
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e.ew.writeb(v)
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}
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func (e *jsonEncDriver) quoteStr(s string) {
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// adapted from std pkg encoding/json
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const hex = "0123456789abcdef"
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w := e.ew
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htmlasis := e.h.HTMLCharsAsIs
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w.writen1('"')
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var start int
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for i, slen := 0, len(s); i < slen; {
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// encode all bytes < 0x20 (except \r, \n).
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// also encode < > & to prevent security holes when served to some browsers.
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if b := s[i]; b < utf8.RuneSelf {
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// if 0x20 <= b && b != '\\' && b != '"' && b != '<' && b != '>' && b != '&' {
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// if (htmlasis && jsonCharSafeSet.isset(b)) || jsonCharHtmlSafeSet.isset(b) {
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if jsonCharHtmlSafeSet.isset(b) || (htmlasis && jsonCharSafeSet.isset(b)) {
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i++
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continue
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}
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if start < i {
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w.writestr(s[start:i])
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}
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switch b {
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case '\\', '"':
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w.writen2('\\', b)
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case '\n':
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w.writen2('\\', 'n')
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case '\r':
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w.writen2('\\', 'r')
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case '\b':
|
|
w.writen2('\\', 'b')
|
|
case '\f':
|
|
w.writen2('\\', 'f')
|
|
case '\t':
|
|
w.writen2('\\', 't')
|
|
default:
|
|
w.writestr(`\u00`)
|
|
w.writen2(hex[b>>4], hex[b&0xF])
|
|
}
|
|
i++
|
|
start = i
|
|
continue
|
|
}
|
|
c, size := utf8.DecodeRuneInString(s[i:])
|
|
if c == utf8.RuneError && size == 1 {
|
|
if start < i {
|
|
w.writestr(s[start:i])
|
|
}
|
|
w.writestr(`\ufffd`)
|
|
i += size
|
|
start = i
|
|
continue
|
|
}
|
|
// U+2028 is LINE SEPARATOR. U+2029 is PARAGRAPH SEPARATOR.
|
|
// Both technically valid JSON, but bomb on JSONP, so fix here unconditionally.
|
|
if c == '\u2028' || c == '\u2029' {
|
|
if start < i {
|
|
w.writestr(s[start:i])
|
|
}
|
|
w.writestr(`\u202`)
|
|
w.writen1(hex[c&0xF])
|
|
i += size
|
|
start = i
|
|
continue
|
|
}
|
|
i += size
|
|
}
|
|
if start < len(s) {
|
|
w.writestr(s[start:])
|
|
}
|
|
w.writen1('"')
|
|
}
|
|
|
|
type jsonDecDriver struct {
|
|
noBuiltInTypes
|
|
d *Decoder
|
|
h *JsonHandle
|
|
r decReader // *decReaderSwitch // decReader
|
|
se extWrapper
|
|
|
|
// ---- writable fields during execution --- *try* to keep in sep cache line
|
|
|
|
c containerState
|
|
// tok is used to store the token read right after skipWhiteSpace.
|
|
tok uint8
|
|
fnull bool // found null from appendStringAsBytes
|
|
bs []byte // scratch. Initialized from b. Used for parsing strings or numbers.
|
|
bstr [8]byte // scratch used for string \UXXX parsing
|
|
// ---- cpu cache line boundary?
|
|
b [jsonScratchArrayLen]byte // scratch 1, used for parsing strings or numbers or time.Time
|
|
b2 [jsonScratchArrayLen]byte // scratch 2, used only for readUntil, decNumBytes
|
|
|
|
_ [3]uint64 // padding
|
|
// n jsonNum
|
|
}
|
|
|
|
// func jsonIsWS(b byte) bool {
|
|
// // return b == ' ' || b == '\t' || b == '\r' || b == '\n'
|
|
// return jsonCharWhitespaceSet.isset(b)
|
|
// }
|
|
|
|
func (d *jsonDecDriver) uncacheRead() {
|
|
if d.tok != 0 {
|
|
d.r.unreadn1()
|
|
d.tok = 0
|
|
}
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadMapStart() int {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
const xc uint8 = '{'
|
|
if d.tok != xc {
|
|
d.d.errorf("expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerMapStart
|
|
return -1
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadArrayStart() int {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
const xc uint8 = '['
|
|
if d.tok != xc {
|
|
d.d.errorf("expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerArrayStart
|
|
return -1
|
|
}
|
|
|
|
func (d *jsonDecDriver) CheckBreak() bool {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
return d.tok == '}' || d.tok == ']'
|
|
}
|
|
|
|
// For the ReadXXX methods below, we could just delegate to helper functions
|
|
// readContainerState(c containerState, xc uint8, check bool)
|
|
// - ReadArrayElem would become:
|
|
// readContainerState(containerArrayElem, ',', d.c != containerArrayStart)
|
|
//
|
|
// However, until mid-stack inlining (go 1.10?) comes, supporting inlining of
|
|
// oneliners, we explicitly write them all 5 out to elide the extra func call.
|
|
// TODO: For Go 1.10, if inlined, consider consolidating these.
|
|
|
|
func (d *jsonDecDriver) ReadArrayElem() {
|
|
const xc uint8 = ','
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.c != containerArrayStart {
|
|
if d.tok != xc {
|
|
d.d.errorf("expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
}
|
|
d.c = containerArrayElem
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadArrayEnd() {
|
|
const xc uint8 = ']'
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.tok != xc {
|
|
d.d.errorf("expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerArrayEnd
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadMapElemKey() {
|
|
const xc uint8 = ','
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.c != containerMapStart {
|
|
if d.tok != xc {
|
|
d.d.errorf("expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
}
|
|
d.c = containerMapKey
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadMapElemValue() {
|
|
const xc uint8 = ':'
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.tok != xc {
|
|
d.d.errorf("expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerMapValue
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadMapEnd() {
|
|
const xc uint8 = '}'
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.tok != xc {
|
|
d.d.errorf("expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerMapEnd
|
|
}
|
|
|
|
func (d *jsonDecDriver) readLit(length, fromIdx uint8) {
|
|
bs := d.r.readx(int(length))
|
|
d.tok = 0
|
|
if jsonValidateSymbols && !bytes.Equal(bs, jsonLiterals[fromIdx:fromIdx+length]) {
|
|
d.d.errorf("expecting %s: got %s", jsonLiterals[fromIdx:fromIdx+length], bs)
|
|
return
|
|
}
|
|
}
|
|
|
|
func (d *jsonDecDriver) TryDecodeAsNil() bool {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
// we shouldn't try to see if "null" was here, right?
|
|
// only the plain string: `null` denotes a nil (ie not quotes)
|
|
if d.tok == 'n' {
|
|
d.readLit(3, jsonLitNull+1) // (n)ull
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeBool() (v bool) {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
fquot := d.c == containerMapKey && d.tok == '"'
|
|
if fquot {
|
|
d.tok = d.r.readn1()
|
|
}
|
|
switch d.tok {
|
|
case 'f':
|
|
d.readLit(4, jsonLitFalse+1) // (f)alse
|
|
// v = false
|
|
case 't':
|
|
d.readLit(3, jsonLitTrue+1) // (t)rue
|
|
v = true
|
|
default:
|
|
d.d.errorf("decode bool: got first char %c", d.tok)
|
|
// v = false // "unreachable"
|
|
}
|
|
if fquot {
|
|
d.r.readn1()
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeTime() (t time.Time) {
|
|
// read string, and pass the string into json.unmarshal
|
|
d.appendStringAsBytes()
|
|
if d.fnull {
|
|
return
|
|
}
|
|
t, err := time.Parse(time.RFC3339, stringView(d.bs))
|
|
if err != nil {
|
|
d.d.errorv(err)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) ContainerType() (vt valueType) {
|
|
// check container type by checking the first char
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
|
|
// optimize this, so we don't do 4 checks but do one computation.
|
|
// return jsonContainerSet[d.tok]
|
|
|
|
// ContainerType is mostly called for Map and Array,
|
|
// so this conditional is good enough (max 2 checks typically)
|
|
if b := d.tok; b == '{' {
|
|
return valueTypeMap
|
|
} else if b == '[' {
|
|
return valueTypeArray
|
|
} else if b == 'n' {
|
|
return valueTypeNil
|
|
} else if b == '"' {
|
|
return valueTypeString
|
|
}
|
|
return valueTypeUnset
|
|
}
|
|
|
|
func (d *jsonDecDriver) decNumBytes() (bs []byte) {
|
|
// stores num bytes in d.bs
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
if d.tok == '"' {
|
|
bs = d.r.readUntil(d.b2[:0], '"')
|
|
bs = bs[:len(bs)-1]
|
|
} else {
|
|
d.r.unreadn1()
|
|
bs = d.r.readTo(d.bs[:0], &jsonNumSet)
|
|
}
|
|
d.tok = 0
|
|
return bs
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeUint64() (u uint64) {
|
|
bs := d.decNumBytes()
|
|
n, neg, badsyntax, overflow := jsonParseInteger(bs)
|
|
if overflow {
|
|
d.d.errorf("overflow parsing unsigned integer: %s", bs)
|
|
} else if neg {
|
|
d.d.errorf("minus found parsing unsigned integer: %s", bs)
|
|
} else if badsyntax {
|
|
// fallback: try to decode as float, and cast
|
|
n = d.decUint64ViaFloat(stringView(bs))
|
|
}
|
|
return n
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeInt64() (i int64) {
|
|
const cutoff = uint64(1 << uint(64-1))
|
|
bs := d.decNumBytes()
|
|
n, neg, badsyntax, overflow := jsonParseInteger(bs)
|
|
if overflow {
|
|
d.d.errorf("overflow parsing integer: %s", bs)
|
|
} else if badsyntax {
|
|
// d.d.errorf("invalid syntax for integer: %s", bs)
|
|
// fallback: try to decode as float, and cast
|
|
if neg {
|
|
n = d.decUint64ViaFloat(stringView(bs[1:]))
|
|
} else {
|
|
n = d.decUint64ViaFloat(stringView(bs))
|
|
}
|
|
}
|
|
if neg {
|
|
if n > cutoff {
|
|
d.d.errorf("overflow parsing integer: %s", bs)
|
|
}
|
|
i = -(int64(n))
|
|
} else {
|
|
if n >= cutoff {
|
|
d.d.errorf("overflow parsing integer: %s", bs)
|
|
}
|
|
i = int64(n)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) decUint64ViaFloat(s string) (u uint64) {
|
|
f, err := strconv.ParseFloat(s, 64)
|
|
if err != nil {
|
|
d.d.errorf("invalid syntax for integer: %s", s)
|
|
// d.d.errorv(err)
|
|
}
|
|
fi, ff := math.Modf(f)
|
|
if ff > 0 {
|
|
d.d.errorf("fractional part found parsing integer: %s", s)
|
|
} else if fi > float64(math.MaxUint64) {
|
|
d.d.errorf("overflow parsing integer: %s", s)
|
|
}
|
|
return uint64(fi)
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeFloat64() (f float64) {
|
|
bs := d.decNumBytes()
|
|
f, err := strconv.ParseFloat(stringView(bs), 64)
|
|
if err != nil {
|
|
d.d.errorv(err)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeExt(rv interface{}, xtag uint64, ext Ext) (realxtag uint64) {
|
|
if ext == nil {
|
|
re := rv.(*RawExt)
|
|
re.Tag = xtag
|
|
d.d.decode(&re.Value)
|
|
} else {
|
|
var v interface{}
|
|
d.d.decode(&v)
|
|
ext.UpdateExt(rv, v)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeBytes(bs []byte, zerocopy bool) (bsOut []byte) {
|
|
// if decoding into raw bytes, and the RawBytesExt is configured, use it to decode.
|
|
if d.se.InterfaceExt != nil {
|
|
bsOut = bs
|
|
d.DecodeExt(&bsOut, 0, &d.se)
|
|
return
|
|
}
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
// check if an "array" of uint8's (see ContainerType for how to infer if an array)
|
|
if d.tok == '[' {
|
|
bsOut, _ = fastpathTV.DecSliceUint8V(bs, true, d.d)
|
|
return
|
|
}
|
|
d.appendStringAsBytes()
|
|
// base64 encodes []byte{} as "", and we encode nil []byte as null.
|
|
// Consequently, base64 should decode null as a nil []byte, and "" as an empty []byte{}.
|
|
// appendStringAsBytes returns a zero-len slice for both, so as not to reset d.bs.
|
|
// However, it sets a fnull field to true, so we can check if a null was found.
|
|
if len(d.bs) == 0 {
|
|
if d.fnull {
|
|
return nil
|
|
}
|
|
return []byte{}
|
|
}
|
|
bs0 := d.bs
|
|
slen := base64.StdEncoding.DecodedLen(len(bs0))
|
|
if slen <= cap(bs) {
|
|
bsOut = bs[:slen]
|
|
} else if zerocopy && slen <= cap(d.b2) {
|
|
bsOut = d.b2[:slen]
|
|
} else {
|
|
bsOut = make([]byte, slen)
|
|
}
|
|
slen2, err := base64.StdEncoding.Decode(bsOut, bs0)
|
|
if err != nil {
|
|
d.d.errorf("error decoding base64 binary '%s': %v", bs0, err)
|
|
return nil
|
|
}
|
|
if slen != slen2 {
|
|
bsOut = bsOut[:slen2]
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeString() (s string) {
|
|
d.appendStringAsBytes()
|
|
return d.bsToString()
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeStringAsBytes() (s []byte) {
|
|
d.appendStringAsBytes()
|
|
return d.bs
|
|
}
|
|
|
|
func (d *jsonDecDriver) appendStringAsBytes() {
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
|
|
d.fnull = false
|
|
if d.tok != '"' {
|
|
// d.d.errorf("expect char '%c' but got char '%c'", '"', d.tok)
|
|
// handle non-string scalar: null, true, false or a number
|
|
switch d.tok {
|
|
case 'n':
|
|
d.readLit(3, jsonLitNull+1) // (n)ull
|
|
d.bs = d.bs[:0]
|
|
d.fnull = true
|
|
case 'f':
|
|
d.readLit(4, jsonLitFalse+1) // (f)alse
|
|
d.bs = d.bs[:5]
|
|
copy(d.bs, "false")
|
|
case 't':
|
|
d.readLit(3, jsonLitTrue+1) // (t)rue
|
|
d.bs = d.bs[:4]
|
|
copy(d.bs, "true")
|
|
default:
|
|
// try to parse a valid number
|
|
bs := d.decNumBytes()
|
|
if len(bs) <= cap(d.bs) {
|
|
d.bs = d.bs[:len(bs)]
|
|
} else {
|
|
d.bs = make([]byte, len(bs))
|
|
}
|
|
copy(d.bs, bs)
|
|
}
|
|
return
|
|
}
|
|
|
|
d.tok = 0
|
|
r := d.r
|
|
var cs = r.readUntil(d.b2[:0], '"')
|
|
var cslen = len(cs)
|
|
var c uint8
|
|
v := d.bs[:0]
|
|
// append on each byte seen can be expensive, so we just
|
|
// keep track of where we last read a contiguous set of
|
|
// non-special bytes (using cursor variable),
|
|
// and when we see a special byte
|
|
// e.g. end-of-slice, " or \,
|
|
// we will append the full range into the v slice before proceeding
|
|
for i, cursor := 0, 0; ; {
|
|
if i == cslen {
|
|
v = append(v, cs[cursor:]...)
|
|
cs = r.readUntil(d.b2[:0], '"')
|
|
cslen = len(cs)
|
|
i, cursor = 0, 0
|
|
}
|
|
c = cs[i]
|
|
if c == '"' {
|
|
v = append(v, cs[cursor:i]...)
|
|
break
|
|
}
|
|
if c != '\\' {
|
|
i++
|
|
continue
|
|
}
|
|
v = append(v, cs[cursor:i]...)
|
|
i++
|
|
c = cs[i]
|
|
switch c {
|
|
case '"', '\\', '/', '\'':
|
|
v = append(v, c)
|
|
case 'b':
|
|
v = append(v, '\b')
|
|
case 'f':
|
|
v = append(v, '\f')
|
|
case 'n':
|
|
v = append(v, '\n')
|
|
case 'r':
|
|
v = append(v, '\r')
|
|
case 't':
|
|
v = append(v, '\t')
|
|
case 'u':
|
|
var r rune
|
|
var rr uint32
|
|
if len(cs) < i+4 { // may help reduce bounds-checking
|
|
d.d.errorf("need at least 4 more bytes for unicode sequence")
|
|
}
|
|
// c = cs[i+4] // may help reduce bounds-checking
|
|
for j := 1; j < 5; j++ {
|
|
// best to use explicit if-else
|
|
// - not a table, etc which involve memory loads, array lookup with bounds checks, etc
|
|
c = cs[i+j]
|
|
if c >= '0' && c <= '9' {
|
|
rr = rr*16 + uint32(c-jsonU4Chk2)
|
|
} else if c >= 'a' && c <= 'f' {
|
|
rr = rr*16 + uint32(c-jsonU4Chk1)
|
|
} else if c >= 'A' && c <= 'F' {
|
|
rr = rr*16 + uint32(c-jsonU4Chk0)
|
|
} else {
|
|
r = unicode.ReplacementChar
|
|
i += 4
|
|
goto encode_rune
|
|
}
|
|
}
|
|
r = rune(rr)
|
|
i += 4
|
|
if utf16.IsSurrogate(r) {
|
|
if len(cs) >= i+6 && cs[i+2] == 'u' && cs[i+1] == '\\' {
|
|
i += 2
|
|
// c = cs[i+4] // may help reduce bounds-checking
|
|
var rr1 uint32
|
|
for j := 1; j < 5; j++ {
|
|
c = cs[i+j]
|
|
if c >= '0' && c <= '9' {
|
|
rr = rr*16 + uint32(c-jsonU4Chk2)
|
|
} else if c >= 'a' && c <= 'f' {
|
|
rr = rr*16 + uint32(c-jsonU4Chk1)
|
|
} else if c >= 'A' && c <= 'F' {
|
|
rr = rr*16 + uint32(c-jsonU4Chk0)
|
|
} else {
|
|
r = unicode.ReplacementChar
|
|
i += 4
|
|
goto encode_rune
|
|
}
|
|
}
|
|
r = utf16.DecodeRune(r, rune(rr1))
|
|
i += 4
|
|
} else {
|
|
r = unicode.ReplacementChar
|
|
goto encode_rune
|
|
}
|
|
}
|
|
encode_rune:
|
|
w2 := utf8.EncodeRune(d.bstr[:], r)
|
|
v = append(v, d.bstr[:w2]...)
|
|
default:
|
|
d.d.errorf("unsupported escaped value: %c", c)
|
|
}
|
|
i++
|
|
cursor = i
|
|
}
|
|
d.bs = v
|
|
}
|
|
|
|
func (d *jsonDecDriver) nakedNum(z *decNaked, bs []byte) (err error) {
|
|
const cutoff = uint64(1 << uint(64-1))
|
|
var n uint64
|
|
var neg, badsyntax, overflow bool
|
|
|
|
if d.h.PreferFloat {
|
|
goto F
|
|
}
|
|
n, neg, badsyntax, overflow = jsonParseInteger(bs)
|
|
if badsyntax || overflow {
|
|
goto F
|
|
}
|
|
if neg {
|
|
if n > cutoff {
|
|
goto F
|
|
}
|
|
z.v = valueTypeInt
|
|
z.i = -(int64(n))
|
|
} else if d.h.SignedInteger {
|
|
if n >= cutoff {
|
|
goto F
|
|
}
|
|
z.v = valueTypeInt
|
|
z.i = int64(n)
|
|
} else {
|
|
z.v = valueTypeUint
|
|
z.u = n
|
|
}
|
|
return
|
|
F:
|
|
z.v = valueTypeFloat
|
|
z.f, err = strconv.ParseFloat(stringView(bs), 64)
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) bsToString() string {
|
|
// if x := d.s.sc; x != nil && x.so && x.st == '}' { // map key
|
|
if jsonAlwaysReturnInternString || d.c == containerMapKey {
|
|
return d.d.string(d.bs)
|
|
}
|
|
return string(d.bs)
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeNaked() {
|
|
z := d.d.n
|
|
// var decodeFurther bool
|
|
|
|
if d.tok == 0 {
|
|
d.tok = d.r.skip(&jsonCharWhitespaceSet)
|
|
}
|
|
switch d.tok {
|
|
case 'n':
|
|
d.readLit(3, jsonLitNull+1) // (n)ull
|
|
z.v = valueTypeNil
|
|
case 'f':
|
|
d.readLit(4, jsonLitFalse+1) // (f)alse
|
|
z.v = valueTypeBool
|
|
z.b = false
|
|
case 't':
|
|
d.readLit(3, jsonLitTrue+1) // (t)rue
|
|
z.v = valueTypeBool
|
|
z.b = true
|
|
case '{':
|
|
z.v = valueTypeMap // don't consume. kInterfaceNaked will call ReadMapStart
|
|
case '[':
|
|
z.v = valueTypeArray // don't consume. kInterfaceNaked will call ReadArrayStart
|
|
case '"':
|
|
// if a string, and MapKeyAsString, then try to decode it as a nil, bool or number first
|
|
d.appendStringAsBytes()
|
|
if len(d.bs) > 0 && d.c == containerMapKey && d.h.MapKeyAsString {
|
|
switch stringView(d.bs) {
|
|
case "null":
|
|
z.v = valueTypeNil
|
|
case "true":
|
|
z.v = valueTypeBool
|
|
z.b = true
|
|
case "false":
|
|
z.v = valueTypeBool
|
|
z.b = false
|
|
default:
|
|
// check if a number: float, int or uint
|
|
if err := d.nakedNum(z, d.bs); err != nil {
|
|
z.v = valueTypeString
|
|
z.s = d.bsToString()
|
|
}
|
|
}
|
|
} else {
|
|
z.v = valueTypeString
|
|
z.s = d.bsToString()
|
|
}
|
|
default: // number
|
|
bs := d.decNumBytes()
|
|
if len(bs) == 0 {
|
|
d.d.errorf("decode number from empty string")
|
|
return
|
|
}
|
|
if err := d.nakedNum(z, bs); err != nil {
|
|
d.d.errorf("decode number from %s: %v", bs, err)
|
|
return
|
|
}
|
|
}
|
|
// if decodeFurther {
|
|
// d.s.sc.retryRead()
|
|
// }
|
|
return
|
|
}
|
|
|
|
//----------------------
|
|
|
|
// JsonHandle is a handle for JSON encoding format.
|
|
//
|
|
// Json is comprehensively supported:
|
|
// - decodes numbers into interface{} as int, uint or float64
|
|
// based on how the number looks and some config parameters e.g. PreferFloat, SignedInt, etc.
|
|
// - decode integers from float formatted numbers e.g. 1.27e+8
|
|
// - decode any json value (numbers, bool, etc) from quoted strings
|
|
// - configurable way to encode/decode []byte .
|
|
// by default, encodes and decodes []byte using base64 Std Encoding
|
|
// - UTF-8 support for encoding and decoding
|
|
//
|
|
// It has better performance than the json library in the standard library,
|
|
// by leveraging the performance improvements of the codec library.
|
|
//
|
|
// In addition, it doesn't read more bytes than necessary during a decode, which allows
|
|
// reading multiple values from a stream containing json and non-json content.
|
|
// For example, a user can read a json value, then a cbor value, then a msgpack value,
|
|
// all from the same stream in sequence.
|
|
//
|
|
// Note that, when decoding quoted strings, invalid UTF-8 or invalid UTF-16 surrogate pairs are
|
|
// not treated as an error. Instead, they are replaced by the Unicode replacement character U+FFFD.
|
|
type JsonHandle struct {
|
|
textEncodingType
|
|
BasicHandle
|
|
|
|
// Indent indicates how a value is encoded.
|
|
// - If positive, indent by that number of spaces.
|
|
// - If negative, indent by that number of tabs.
|
|
Indent int8
|
|
|
|
// IntegerAsString controls how integers (signed and unsigned) are encoded.
|
|
//
|
|
// Per the JSON Spec, JSON numbers are 64-bit floating point numbers.
|
|
// Consequently, integers > 2^53 cannot be represented as a JSON number without losing precision.
|
|
// This can be mitigated by configuring how to encode integers.
|
|
//
|
|
// IntegerAsString interpretes the following values:
|
|
// - if 'L', then encode integers > 2^53 as a json string.
|
|
// - if 'A', then encode all integers as a json string
|
|
// containing the exact integer representation as a decimal.
|
|
// - else encode all integers as a json number (default)
|
|
IntegerAsString byte
|
|
|
|
// HTMLCharsAsIs controls how to encode some special characters to html: < > &
|
|
//
|
|
// By default, we encode them as \uXXX
|
|
// to prevent security holes when served from some browsers.
|
|
HTMLCharsAsIs bool
|
|
|
|
// PreferFloat says that we will default to decoding a number as a float.
|
|
// If not set, we will examine the characters of the number and decode as an
|
|
// integer type if it doesn't have any of the characters [.eE].
|
|
PreferFloat bool
|
|
|
|
// TermWhitespace says that we add a whitespace character
|
|
// at the end of an encoding.
|
|
//
|
|
// The whitespace is important, especially if using numbers in a context
|
|
// where multiple items are written to a stream.
|
|
TermWhitespace bool
|
|
|
|
// MapKeyAsString says to encode all map keys as strings.
|
|
//
|
|
// Use this to enforce strict json output.
|
|
// The only caveat is that nil value is ALWAYS written as null (never as "null")
|
|
MapKeyAsString bool
|
|
|
|
// _ [2]byte // padding
|
|
|
|
// Note: below, we store hardly-used items e.g. RawBytesExt is cached in the (en|de)cDriver.
|
|
|
|
// RawBytesExt, if configured, is used to encode and decode raw bytes in a custom way.
|
|
// If not configured, raw bytes are encoded to/from base64 text.
|
|
RawBytesExt InterfaceExt
|
|
|
|
_ [3]uint64 // padding
|
|
}
|
|
|
|
// Name returns the name of the handle: json
|
|
func (h *JsonHandle) Name() string { return "json" }
|
|
func (h *JsonHandle) hasElemSeparators() bool { return true }
|
|
func (h *JsonHandle) typical() bool {
|
|
return h.Indent == 0 && !h.MapKeyAsString && h.IntegerAsString != 'A' && h.IntegerAsString != 'L'
|
|
}
|
|
|
|
type jsonTypical interface {
|
|
typical()
|
|
}
|
|
|
|
func (h *JsonHandle) recreateEncDriver(ed encDriver) (v bool) {
|
|
_, v = ed.(jsonTypical)
|
|
return v != h.typical()
|
|
}
|
|
|
|
// SetInterfaceExt sets an extension
|
|
func (h *JsonHandle) SetInterfaceExt(rt reflect.Type, tag uint64, ext InterfaceExt) (err error) {
|
|
return h.SetExt(rt, tag, &extWrapper{bytesExtFailer{}, ext})
|
|
}
|
|
|
|
type jsonEncDriverTypicalImpl struct {
|
|
jsonEncDriver
|
|
jsonEncDriverTypical
|
|
_ [1]uint64 // padding
|
|
}
|
|
|
|
func (x *jsonEncDriverTypicalImpl) reset() {
|
|
x.jsonEncDriver.reset()
|
|
x.jsonEncDriverTypical.reset(&x.jsonEncDriver)
|
|
}
|
|
|
|
type jsonEncDriverGenericImpl struct {
|
|
jsonEncDriver
|
|
jsonEncDriverGeneric
|
|
}
|
|
|
|
func (x *jsonEncDriverGenericImpl) reset() {
|
|
x.jsonEncDriver.reset()
|
|
x.jsonEncDriverGeneric.reset(&x.jsonEncDriver)
|
|
}
|
|
|
|
func (h *JsonHandle) newEncDriver(e *Encoder) (ee encDriver) {
|
|
var hd *jsonEncDriver
|
|
if h.typical() {
|
|
var v jsonEncDriverTypicalImpl
|
|
ee = &v
|
|
hd = &v.jsonEncDriver
|
|
} else {
|
|
var v jsonEncDriverGenericImpl
|
|
ee = &v
|
|
hd = &v.jsonEncDriver
|
|
}
|
|
hd.e, hd.h, hd.bs = e, h, hd.b[:0]
|
|
hd.se.BytesExt = bytesExtFailer{}
|
|
ee.reset()
|
|
return
|
|
}
|
|
|
|
func (h *JsonHandle) newDecDriver(d *Decoder) decDriver {
|
|
// d := jsonDecDriver{r: r.(*bytesDecReader), h: h}
|
|
hd := jsonDecDriver{d: d, h: h}
|
|
hd.se.BytesExt = bytesExtFailer{}
|
|
hd.bs = hd.b[:0]
|
|
hd.reset()
|
|
return &hd
|
|
}
|
|
|
|
func (e *jsonEncDriver) reset() {
|
|
e.ew = e.e.w // e.e.w // &e.e.encWriterSwitch
|
|
e.se.InterfaceExt = e.h.RawBytesExt
|
|
if e.bs != nil {
|
|
e.bs = e.bs[:0]
|
|
}
|
|
}
|
|
|
|
func (d *jsonDecDriver) reset() {
|
|
d.r = d.d.r // &d.d.decReaderSwitch // d.d.r
|
|
d.se.InterfaceExt = d.h.RawBytesExt
|
|
if d.bs != nil {
|
|
d.bs = d.bs[:0]
|
|
}
|
|
d.c, d.tok = 0, 0
|
|
// d.n.reset()
|
|
}
|
|
|
|
func jsonFloatStrconvFmtPrec(f float64) (fmt byte, prec int) {
|
|
prec = -1
|
|
var abs = math.Abs(f)
|
|
if abs != 0 && (abs < 1e-6 || abs >= 1e21) {
|
|
fmt = 'e'
|
|
} else {
|
|
fmt = 'f'
|
|
// set prec to 1 iff mod is 0.
|
|
// better than using jsonIsFloatBytesB2 to check if a . or E in the float bytes.
|
|
// this ensures that every float has an e or .0 in it.
|
|
if abs <= 1 {
|
|
if abs == 0 || abs == 1 {
|
|
prec = 1
|
|
}
|
|
} else if _, mod := math.Modf(abs); mod == 0 {
|
|
prec = 1
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
// custom-fitted version of strconv.Parse(Ui|I)nt.
|
|
// Also ensures we don't have to search for .eE to determine if a float or not.
|
|
func jsonParseInteger(s []byte) (n uint64, neg, badSyntax, overflow bool) {
|
|
const maxUint64 = (1<<64 - 1)
|
|
const cutoff = maxUint64/10 + 1
|
|
|
|
if len(s) == 0 {
|
|
badSyntax = true
|
|
return
|
|
}
|
|
switch s[0] {
|
|
case '+':
|
|
s = s[1:]
|
|
case '-':
|
|
s = s[1:]
|
|
neg = true
|
|
}
|
|
for _, c := range s {
|
|
if c < '0' || c > '9' {
|
|
badSyntax = true
|
|
return
|
|
}
|
|
// unsigned integers don't overflow well on multiplication, so check cutoff here
|
|
// e.g. (maxUint64-5)*10 doesn't overflow well ...
|
|
if n >= cutoff {
|
|
overflow = true
|
|
return
|
|
}
|
|
n *= 10
|
|
n1 := n + uint64(c-'0')
|
|
if n1 < n || n1 > maxUint64 {
|
|
overflow = true
|
|
return
|
|
}
|
|
n = n1
|
|
}
|
|
return
|
|
}
|
|
|
|
var _ decDriver = (*jsonDecDriver)(nil)
|
|
var _ encDriver = (*jsonEncDriverGenericImpl)(nil)
|
|
var _ encDriver = (*jsonEncDriverTypicalImpl)(nil)
|
|
var _ jsonTypical = (*jsonEncDriverTypical)(nil)
|