1222 lines
28 KiB
Go
1222 lines
28 KiB
Go
// Copyright (c) 2012-2015 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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// - Also, strconv.ParseXXX for floats and integers
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// - only works on strings resulting in unnecessary allocation and []byte-string conversion.
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// - it does a lot of redundant checks, because json numbers are simpler that what it supports.
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// - We parse numbers (floats and integers) directly here.
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// We only delegate parsing floats if it is a hairy float which could cause a loss of precision.
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// In that case, we delegate to strconv.ParseFloat.
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//
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// Note:
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// - encode does not beautify. There is no whitespace when encoding.
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// - rpc calls which take single integer arguments or write single numeric arguments will need care.
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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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"fmt"
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"reflect"
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"strconv"
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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 (
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jsonLiterals = [...]byte{'t', 'r', 'u', 'e', 'f', 'a', 'l', 's', 'e', 'n', 'u', 'l', 'l'}
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jsonFloat64Pow10 = [...]float64{
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1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
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1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
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1e20, 1e21, 1e22,
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}
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jsonUint64Pow10 = [...]uint64{
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1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
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1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
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}
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// jsonTabs and jsonSpaces are used as caches for indents
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jsonTabs, jsonSpaces string
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)
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const (
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// jsonUnreadAfterDecNum controls whether we unread after decoding a number.
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//
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// instead of unreading, just update d.tok (iff it's not a whitespace char)
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// However, doing this means that we may HOLD onto some data which belongs to another stream.
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// Thus, it is safest to unread the data when done.
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// keep behind a constant flag for now.
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jsonUnreadAfterDecNum = true
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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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// if jsonTruncateMantissa, truncate mantissa if trailing 0's.
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// This is important because it could allow some floats to be decoded without
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// deferring to strconv.ParseFloat.
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jsonTruncateMantissa = true
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// if mantissa >= jsonNumUintCutoff before multiplying by 10, this is an overflow
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jsonNumUintCutoff = (1<<64-1)/uint64(10) + 1 // cutoff64(base)
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// if mantissa >= jsonNumUintMaxVal, this is an overflow
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jsonNumUintMaxVal = 1<<uint64(64) - 1
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// jsonNumDigitsUint64Largest = 19
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jsonSpacesOrTabsLen = 128
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)
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func init() {
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var bs [jsonSpacesOrTabsLen]byte
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for i := 0; i < jsonSpacesOrTabsLen; i++ {
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bs[i] = ' '
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}
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jsonSpaces = string(bs[:])
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for i := 0; i < jsonSpacesOrTabsLen; i++ {
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bs[i] = '\t'
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}
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jsonTabs = string(bs[:])
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}
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type jsonEncDriver struct {
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e *Encoder
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w encWriter
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h *JsonHandle
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b [64]byte // scratch
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bs []byte // scratch
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se setExtWrapper
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ds string // indent string
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dl uint16 // indent level
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dt bool // indent using tabs
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d bool // indent
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c containerState
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noBuiltInTypes
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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 *jsonEncDriver) sendContainerState(c containerState) {
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// determine whether to output separators
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if c == containerMapKey {
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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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} else if c == containerMapValue {
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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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} else if c == containerMapEnd {
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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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} else if c == containerArrayElem {
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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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} else if c == containerArrayEnd {
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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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}
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e.c = c
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}
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func (e *jsonEncDriver) writeIndent() {
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e.w.writen1('\n')
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if x := len(e.ds) * int(e.dl); x <= jsonSpacesOrTabsLen {
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if e.dt {
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e.w.writestr(jsonTabs[:x])
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} else {
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e.w.writestr(jsonSpaces[:x])
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}
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} else {
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for i := uint16(0); i < e.dl; i++ {
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e.w.writestr(e.ds)
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}
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}
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}
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func (e *jsonEncDriver) EncodeNil() {
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e.w.writeb(jsonLiterals[9:13]) // null
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}
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func (e *jsonEncDriver) EncodeBool(b bool) {
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if b {
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e.w.writeb(jsonLiterals[0:4]) // true
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} else {
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e.w.writeb(jsonLiterals[4:9]) // false
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}
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}
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func (e *jsonEncDriver) EncodeFloat32(f float32) {
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e.encodeFloat(float64(f), 32)
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}
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func (e *jsonEncDriver) EncodeFloat64(f float64) {
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// e.w.writestr(strconv.FormatFloat(f, 'E', -1, 64))
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e.encodeFloat(f, 64)
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}
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func (e *jsonEncDriver) encodeFloat(f float64, numbits int) {
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x := strconv.AppendFloat(e.b[:0], f, 'G', -1, numbits)
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e.w.writeb(x)
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if bytes.IndexByte(x, 'E') == -1 && bytes.IndexByte(x, '.') == -1 {
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e.w.writen2('.', '0')
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}
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}
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func (e *jsonEncDriver) EncodeInt(v int64) {
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if x := e.h.IntegerAsString; x == 'A' || x == 'L' && (v > 1<<53 || v < -(1<<53)) {
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e.w.writen1('"')
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e.w.writeb(strconv.AppendInt(e.b[:0], v, 10))
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e.w.writen1('"')
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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 *jsonEncDriver) EncodeUint(v uint64) {
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if x := e.h.IntegerAsString; x == 'A' || x == 'L' && v > 1<<53 {
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e.w.writen1('"')
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e.w.writeb(strconv.AppendUint(e.b[:0], v, 10))
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e.w.writen1('"')
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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 *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.w.writeb(jsonLiterals[9:13]) // null // 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.w.writeb(jsonLiterals[9:13]) // null // 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) EncodeArrayStart(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 *jsonEncDriver) EncodeMapStart(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 *jsonEncDriver) EncodeString(c charEncoding, v string) {
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// e.w.writestr(strconv.Quote(v))
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e.quoteStr(v)
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}
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func (e *jsonEncDriver) EncodeSymbol(v string) {
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// e.EncodeString(c_UTF8, v)
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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 c == c_RAW && e.se.i != 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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if c == c_RAW {
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slen := base64.StdEncoding.EncodedLen(len(v))
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if cap(e.bs) >= slen {
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e.bs = e.bs[:slen]
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} else {
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e.bs = make([]byte, slen)
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}
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base64.StdEncoding.Encode(e.bs, v)
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e.w.writen1('"')
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e.w.writeb(e.bs)
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e.w.writen1('"')
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} else {
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// e.EncodeString(c, string(v))
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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.w.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.w
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w.writen1('"')
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start := 0
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for i := 0; i < len(s); {
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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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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':
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w.writen2('\\', 'b')
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case '\f':
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w.writen2('\\', 'f')
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case '\t':
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w.writen2('\\', 't')
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default:
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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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w.writestr(`\u00`)
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w.writen2(hex[b>>4], hex[b&0xF])
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}
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i++
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start = i
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continue
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}
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c, size := utf8.DecodeRuneInString(s[i:])
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if c == utf8.RuneError && size == 1 {
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if start < i {
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w.writestr(s[start:i])
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}
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w.writestr(`\ufffd`)
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i += size
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start = i
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continue
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}
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// U+2028 is LINE SEPARATOR. U+2029 is PARAGRAPH SEPARATOR.
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// Both technically valid JSON, but bomb on JSONP, so fix here.
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if c == '\u2028' || c == '\u2029' {
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if start < i {
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w.writestr(s[start:i])
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}
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w.writestr(`\u202`)
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w.writen1(hex[c&0xF])
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i += size
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start = i
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continue
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}
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i += size
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}
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if start < len(s) {
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w.writestr(s[start:])
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}
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w.writen1('"')
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}
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//--------------------------------
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type jsonNum struct {
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// bytes []byte // may have [+-.eE0-9]
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mantissa uint64 // where mantissa ends, and maybe dot begins.
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exponent int16 // exponent value.
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manOverflow bool
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neg bool // started with -. No initial sign in the bytes above.
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dot bool // has dot
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explicitExponent bool // explicit exponent
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}
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func (x *jsonNum) reset() {
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x.manOverflow = false
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x.neg = false
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x.dot = false
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x.explicitExponent = false
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x.mantissa = 0
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x.exponent = 0
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}
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// uintExp is called only if exponent > 0.
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func (x *jsonNum) uintExp() (n uint64, overflow bool) {
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n = x.mantissa
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e := x.exponent
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if e >= int16(len(jsonUint64Pow10)) {
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overflow = true
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return
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}
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n *= jsonUint64Pow10[e]
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if n < x.mantissa || n > jsonNumUintMaxVal {
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overflow = true
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return
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}
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return
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// for i := int16(0); i < e; i++ {
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// if n >= jsonNumUintCutoff {
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// overflow = true
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// return
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// }
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// n *= 10
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// }
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// return
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}
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// these constants are only used withn floatVal.
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// They are brought out, so that floatVal can be inlined.
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const (
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jsonUint64MantissaBits = 52
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jsonMaxExponent = int16(len(jsonFloat64Pow10)) - 1
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)
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func (x *jsonNum) floatVal() (f float64, parseUsingStrConv bool) {
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// We do not want to lose precision.
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// Consequently, we will delegate to strconv.ParseFloat if any of the following happen:
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// - There are more digits than in math.MaxUint64: 18446744073709551615 (20 digits)
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// We expect up to 99.... (19 digits)
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// - The mantissa cannot fit into a 52 bits of uint64
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// - The exponent is beyond our scope ie beyong 22.
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parseUsingStrConv = x.manOverflow ||
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x.exponent > jsonMaxExponent ||
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(x.exponent < 0 && -(x.exponent) > jsonMaxExponent) ||
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x.mantissa>>jsonUint64MantissaBits != 0
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if parseUsingStrConv {
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return
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}
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// all good. so handle parse here.
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f = float64(x.mantissa)
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// fmt.Printf(".Float: uint64 value: %v, float: %v\n", m, f)
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if x.neg {
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f = -f
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}
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if x.exponent > 0 {
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f *= jsonFloat64Pow10[x.exponent]
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} else if x.exponent < 0 {
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f /= jsonFloat64Pow10[-x.exponent]
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}
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return
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}
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type jsonDecDriver struct {
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noBuiltInTypes
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d *Decoder
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h *JsonHandle
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r decReader
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c containerState
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// tok is used to store the token read right after skipWhiteSpace.
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tok uint8
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bstr [8]byte // scratch used for string \UXXX parsing
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b [64]byte // scratch, used for parsing strings or numbers
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b2 [64]byte // scratch, used only for decodeBytes (after base64)
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bs []byte // scratch. Initialized from b. Used for parsing strings or numbers.
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se setExtWrapper
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n jsonNum
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}
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func jsonIsWS(b byte) bool {
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return b == ' ' || b == '\t' || b == '\r' || b == '\n'
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}
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// // This will skip whitespace characters and return the next byte to read.
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// // The next byte determines what the value will be one of.
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// func (d *jsonDecDriver) skipWhitespace() {
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// // fast-path: do not enter loop. Just check first (in case no whitespace).
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// b := d.r.readn1()
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// if jsonIsWS(b) {
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// r := d.r
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// for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
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// }
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// }
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// d.tok = b
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// }
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func (d *jsonDecDriver) uncacheRead() {
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if d.tok != 0 {
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d.r.unreadn1()
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d.tok = 0
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}
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}
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func (d *jsonDecDriver) sendContainerState(c containerState) {
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if d.tok == 0 {
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var b byte
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r := d.r
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for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
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}
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d.tok = b
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}
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var xc uint8 // char expected
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if c == containerMapKey {
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if d.c != containerMapStart {
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xc = ','
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}
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} else if c == containerMapValue {
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xc = ':'
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|
} else if c == containerMapEnd {
|
|
xc = '}'
|
|
} else if c == containerArrayElem {
|
|
if d.c != containerArrayStart {
|
|
xc = ','
|
|
}
|
|
} else if c == containerArrayEnd {
|
|
xc = ']'
|
|
}
|
|
if xc != 0 {
|
|
if d.tok != xc {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", xc, d.tok)
|
|
}
|
|
d.tok = 0
|
|
}
|
|
d.c = c
|
|
}
|
|
|
|
func (d *jsonDecDriver) CheckBreak() bool {
|
|
if d.tok == 0 {
|
|
var b byte
|
|
r := d.r
|
|
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
|
|
}
|
|
d.tok = b
|
|
}
|
|
if d.tok == '}' || d.tok == ']' {
|
|
// d.tok = 0 // only checking, not consuming
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (d *jsonDecDriver) readStrIdx(fromIdx, toIdx uint8) {
|
|
bs := d.r.readx(int(toIdx - fromIdx))
|
|
d.tok = 0
|
|
if jsonValidateSymbols {
|
|
if !bytes.Equal(bs, jsonLiterals[fromIdx:toIdx]) {
|
|
d.d.errorf("json: expecting %s: got %s", jsonLiterals[fromIdx:toIdx], bs)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func (d *jsonDecDriver) TryDecodeAsNil() bool {
|
|
if d.tok == 0 {
|
|
var b byte
|
|
r := d.r
|
|
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
|
|
}
|
|
d.tok = b
|
|
}
|
|
if d.tok == 'n' {
|
|
d.readStrIdx(10, 13) // ull
|
|
return true
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeBool() bool {
|
|
if d.tok == 0 {
|
|
var b byte
|
|
r := d.r
|
|
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
|
|
}
|
|
d.tok = b
|
|
}
|
|
if d.tok == 'f' {
|
|
d.readStrIdx(5, 9) // alse
|
|
return false
|
|
}
|
|
if d.tok == 't' {
|
|
d.readStrIdx(1, 4) // rue
|
|
return true
|
|
}
|
|
d.d.errorf("json: decode bool: got first char %c", d.tok)
|
|
return false // "unreachable"
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadMapStart() int {
|
|
if d.tok == 0 {
|
|
var b byte
|
|
r := d.r
|
|
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
|
|
}
|
|
d.tok = b
|
|
}
|
|
if d.tok != '{' {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", '{', d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerMapStart
|
|
return -1
|
|
}
|
|
|
|
func (d *jsonDecDriver) ReadArrayStart() int {
|
|
if d.tok == 0 {
|
|
var b byte
|
|
r := d.r
|
|
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
|
|
}
|
|
d.tok = b
|
|
}
|
|
if d.tok != '[' {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", '[', d.tok)
|
|
}
|
|
d.tok = 0
|
|
d.c = containerArrayStart
|
|
return -1
|
|
}
|
|
|
|
func (d *jsonDecDriver) ContainerType() (vt valueType) {
|
|
// check container type by checking the first char
|
|
if d.tok == 0 {
|
|
var b byte
|
|
r := d.r
|
|
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
|
|
}
|
|
d.tok = b
|
|
}
|
|
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
|
|
// d.d.errorf("isContainerType: unsupported parameter: %v", vt)
|
|
// return false // "unreachable"
|
|
}
|
|
|
|
func (d *jsonDecDriver) decNum(storeBytes bool) {
|
|
// If it is has a . or an e|E, decode as a float; else decode as an int.
|
|
if d.tok == 0 {
|
|
var b byte
|
|
r := d.r
|
|
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
|
|
}
|
|
d.tok = b
|
|
}
|
|
b := d.tok
|
|
var str bool
|
|
if b == '"' {
|
|
str = true
|
|
b = d.r.readn1()
|
|
}
|
|
if !(b == '+' || b == '-' || b == '.' || (b >= '0' && b <= '9')) {
|
|
d.d.errorf("json: decNum: got first char '%c'", b)
|
|
return
|
|
}
|
|
d.tok = 0
|
|
|
|
const cutoff = (1<<64-1)/uint64(10) + 1 // cutoff64(base)
|
|
const jsonNumUintMaxVal = 1<<uint64(64) - 1
|
|
|
|
n := &d.n
|
|
r := d.r
|
|
n.reset()
|
|
d.bs = d.bs[:0]
|
|
|
|
if str && storeBytes {
|
|
d.bs = append(d.bs, '"')
|
|
}
|
|
|
|
// The format of a number is as below:
|
|
// parsing: sign? digit* dot? digit* e? sign? digit*
|
|
// states: 0 1* 2 3* 4 5* 6 7
|
|
// We honor this state so we can break correctly.
|
|
var state uint8 = 0
|
|
var eNeg bool
|
|
var e int16
|
|
var eof bool
|
|
LOOP:
|
|
for !eof {
|
|
// fmt.Printf("LOOP: b: %q\n", b)
|
|
switch b {
|
|
case '+':
|
|
switch state {
|
|
case 0:
|
|
state = 2
|
|
// do not add sign to the slice ...
|
|
b, eof = r.readn1eof()
|
|
continue
|
|
case 6: // typ = jsonNumFloat
|
|
state = 7
|
|
default:
|
|
break LOOP
|
|
}
|
|
case '-':
|
|
switch state {
|
|
case 0:
|
|
state = 2
|
|
n.neg = true
|
|
// do not add sign to the slice ...
|
|
b, eof = r.readn1eof()
|
|
continue
|
|
case 6: // typ = jsonNumFloat
|
|
eNeg = true
|
|
state = 7
|
|
default:
|
|
break LOOP
|
|
}
|
|
case '.':
|
|
switch state {
|
|
case 0, 2: // typ = jsonNumFloat
|
|
state = 4
|
|
n.dot = true
|
|
default:
|
|
break LOOP
|
|
}
|
|
case 'e', 'E':
|
|
switch state {
|
|
case 0, 2, 4: // typ = jsonNumFloat
|
|
state = 6
|
|
// n.mantissaEndIndex = int16(len(n.bytes))
|
|
n.explicitExponent = true
|
|
default:
|
|
break LOOP
|
|
}
|
|
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
|
|
switch state {
|
|
case 0:
|
|
state = 2
|
|
fallthrough
|
|
case 2:
|
|
fallthrough
|
|
case 4:
|
|
if n.dot {
|
|
n.exponent--
|
|
}
|
|
if n.mantissa >= jsonNumUintCutoff {
|
|
n.manOverflow = true
|
|
break
|
|
}
|
|
v := uint64(b - '0')
|
|
n.mantissa *= 10
|
|
if v != 0 {
|
|
n1 := n.mantissa + v
|
|
if n1 < n.mantissa || n1 > jsonNumUintMaxVal {
|
|
n.manOverflow = true // n+v overflows
|
|
break
|
|
}
|
|
n.mantissa = n1
|
|
}
|
|
case 6:
|
|
state = 7
|
|
fallthrough
|
|
case 7:
|
|
if !(b == '0' && e == 0) {
|
|
e = e*10 + int16(b-'0')
|
|
}
|
|
default:
|
|
break LOOP
|
|
}
|
|
case '"':
|
|
if str {
|
|
if storeBytes {
|
|
d.bs = append(d.bs, '"')
|
|
}
|
|
b, eof = r.readn1eof()
|
|
}
|
|
break LOOP
|
|
default:
|
|
break LOOP
|
|
}
|
|
if storeBytes {
|
|
d.bs = append(d.bs, b)
|
|
}
|
|
b, eof = r.readn1eof()
|
|
}
|
|
|
|
if jsonTruncateMantissa && n.mantissa != 0 {
|
|
for n.mantissa%10 == 0 {
|
|
n.mantissa /= 10
|
|
n.exponent++
|
|
}
|
|
}
|
|
|
|
if e != 0 {
|
|
if eNeg {
|
|
n.exponent -= e
|
|
} else {
|
|
n.exponent += e
|
|
}
|
|
}
|
|
|
|
// d.n = n
|
|
|
|
if !eof {
|
|
if jsonUnreadAfterDecNum {
|
|
r.unreadn1()
|
|
} else {
|
|
if !jsonIsWS(b) {
|
|
d.tok = b
|
|
}
|
|
}
|
|
}
|
|
// fmt.Printf("1: n: bytes: %s, neg: %v, dot: %v, exponent: %v, mantissaEndIndex: %v\n",
|
|
// n.bytes, n.neg, n.dot, n.exponent, n.mantissaEndIndex)
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeInt(bitsize uint8) (i int64) {
|
|
d.decNum(false)
|
|
n := &d.n
|
|
if n.manOverflow {
|
|
d.d.errorf("json: overflow integer after: %v", n.mantissa)
|
|
return
|
|
}
|
|
var u uint64
|
|
if n.exponent == 0 {
|
|
u = n.mantissa
|
|
} else if n.exponent < 0 {
|
|
d.d.errorf("json: fractional integer")
|
|
return
|
|
} else if n.exponent > 0 {
|
|
var overflow bool
|
|
if u, overflow = n.uintExp(); overflow {
|
|
d.d.errorf("json: overflow integer")
|
|
return
|
|
}
|
|
}
|
|
i = int64(u)
|
|
if n.neg {
|
|
i = -i
|
|
}
|
|
if chkOvf.Int(i, bitsize) {
|
|
d.d.errorf("json: overflow %v bits: %s", bitsize, d.bs)
|
|
return
|
|
}
|
|
// fmt.Printf("DecodeInt: %v\n", i)
|
|
return
|
|
}
|
|
|
|
// floatVal MUST only be called after a decNum, as d.bs now contains the bytes of the number
|
|
func (d *jsonDecDriver) floatVal() (f float64) {
|
|
f, useStrConv := d.n.floatVal()
|
|
if useStrConv {
|
|
var err error
|
|
if f, err = strconv.ParseFloat(stringView(d.bs), 64); err != nil {
|
|
panic(fmt.Errorf("parse float: %s, %v", d.bs, err))
|
|
}
|
|
if d.n.neg {
|
|
f = -f
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeUint(bitsize uint8) (u uint64) {
|
|
d.decNum(false)
|
|
n := &d.n
|
|
if n.neg {
|
|
d.d.errorf("json: unsigned integer cannot be negative")
|
|
return
|
|
}
|
|
if n.manOverflow {
|
|
d.d.errorf("json: overflow integer after: %v", n.mantissa)
|
|
return
|
|
}
|
|
if n.exponent == 0 {
|
|
u = n.mantissa
|
|
} else if n.exponent < 0 {
|
|
d.d.errorf("json: fractional integer")
|
|
return
|
|
} else if n.exponent > 0 {
|
|
var overflow bool
|
|
if u, overflow = n.uintExp(); overflow {
|
|
d.d.errorf("json: overflow integer")
|
|
return
|
|
}
|
|
}
|
|
if chkOvf.Uint(u, bitsize) {
|
|
d.d.errorf("json: overflow %v bits: %s", bitsize, d.bs)
|
|
return
|
|
}
|
|
// fmt.Printf("DecodeUint: %v\n", u)
|
|
return
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeFloat(chkOverflow32 bool) (f float64) {
|
|
d.decNum(true)
|
|
f = d.floatVal()
|
|
if chkOverflow32 && chkOvf.Float32(f) {
|
|
d.d.errorf("json: overflow float32: %v, %s", f, d.bs)
|
|
return
|
|
}
|
|
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, isstring, zerocopy bool) (bsOut []byte) {
|
|
// if decoding into raw bytes, and the RawBytesExt is configured, use it to decode.
|
|
if !isstring && d.se.i != nil {
|
|
bsOut = bs
|
|
d.DecodeExt(&bsOut, 0, &d.se)
|
|
return
|
|
}
|
|
d.appendStringAsBytes()
|
|
// if isstring, then just return the bytes, even if it is using the scratch buffer.
|
|
// the bytes will be converted to a string as needed.
|
|
if isstring {
|
|
return d.bs
|
|
}
|
|
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("json: 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()
|
|
// if x := d.s.sc; x != nil && x.so && x.st == '}' { // map key
|
|
if d.c == containerMapKey {
|
|
return d.d.string(d.bs)
|
|
}
|
|
return string(d.bs)
|
|
}
|
|
|
|
func (d *jsonDecDriver) appendStringAsBytes() {
|
|
if d.tok == 0 {
|
|
var b byte
|
|
r := d.r
|
|
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
|
|
}
|
|
d.tok = b
|
|
}
|
|
if d.tok != '"' {
|
|
d.d.errorf("json: expect char '%c' but got char '%c'", '"', d.tok)
|
|
}
|
|
d.tok = 0
|
|
|
|
v := d.bs[:0]
|
|
var c uint8
|
|
r := d.r
|
|
for {
|
|
c = r.readn1()
|
|
if c == '"' {
|
|
break
|
|
} else if c == '\\' {
|
|
c = r.readn1()
|
|
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':
|
|
rr := d.jsonU4(false)
|
|
// fmt.Printf("$$$$$$$$$: is surrogate: %v\n", utf16.IsSurrogate(rr))
|
|
if utf16.IsSurrogate(rr) {
|
|
rr = utf16.DecodeRune(rr, d.jsonU4(true))
|
|
}
|
|
w2 := utf8.EncodeRune(d.bstr[:], rr)
|
|
v = append(v, d.bstr[:w2]...)
|
|
default:
|
|
d.d.errorf("json: unsupported escaped value: %c", c)
|
|
}
|
|
} else {
|
|
v = append(v, c)
|
|
}
|
|
}
|
|
d.bs = v
|
|
}
|
|
|
|
func (d *jsonDecDriver) jsonU4(checkSlashU bool) rune {
|
|
r := d.r
|
|
if checkSlashU && !(r.readn1() == '\\' && r.readn1() == 'u') {
|
|
d.d.errorf(`json: unquoteStr: invalid unicode sequence. Expecting \u`)
|
|
return 0
|
|
}
|
|
// u, _ := strconv.ParseUint(string(d.bstr[:4]), 16, 64)
|
|
var u uint32
|
|
for i := 0; i < 4; i++ {
|
|
v := r.readn1()
|
|
if '0' <= v && v <= '9' {
|
|
v = v - '0'
|
|
} else if 'a' <= v && v <= 'z' {
|
|
v = v - 'a' + 10
|
|
} else if 'A' <= v && v <= 'Z' {
|
|
v = v - 'A' + 10
|
|
} else {
|
|
d.d.errorf(`json: unquoteStr: invalid hex char in \u unicode sequence: %q`, v)
|
|
return 0
|
|
}
|
|
u = u*16 + uint32(v)
|
|
}
|
|
return rune(u)
|
|
}
|
|
|
|
func (d *jsonDecDriver) DecodeNaked() {
|
|
z := &d.d.n
|
|
// var decodeFurther bool
|
|
|
|
if d.tok == 0 {
|
|
var b byte
|
|
r := d.r
|
|
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
|
|
}
|
|
d.tok = b
|
|
}
|
|
switch d.tok {
|
|
case 'n':
|
|
d.readStrIdx(10, 13) // ull
|
|
z.v = valueTypeNil
|
|
case 'f':
|
|
d.readStrIdx(5, 9) // alse
|
|
z.v = valueTypeBool
|
|
z.b = false
|
|
case 't':
|
|
d.readStrIdx(1, 4) // rue
|
|
z.v = valueTypeBool
|
|
z.b = true
|
|
case '{':
|
|
z.v = valueTypeMap
|
|
// d.tok = 0 // don't consume. kInterfaceNaked will call ReadMapStart
|
|
// decodeFurther = true
|
|
case '[':
|
|
z.v = valueTypeArray
|
|
// d.tok = 0 // don't consume. kInterfaceNaked will call ReadArrayStart
|
|
// decodeFurther = true
|
|
case '"':
|
|
z.v = valueTypeString
|
|
z.s = d.DecodeString()
|
|
default: // number
|
|
d.decNum(true)
|
|
n := &d.n
|
|
// if the string had a any of [.eE], then decode as float.
|
|
switch {
|
|
case n.explicitExponent, n.dot, n.exponent < 0, n.manOverflow:
|
|
z.v = valueTypeFloat
|
|
z.f = d.floatVal()
|
|
case n.exponent == 0:
|
|
u := n.mantissa
|
|
switch {
|
|
case n.neg:
|
|
z.v = valueTypeInt
|
|
z.i = -int64(u)
|
|
case d.h.SignedInteger:
|
|
z.v = valueTypeInt
|
|
z.i = int64(u)
|
|
default:
|
|
z.v = valueTypeUint
|
|
z.u = u
|
|
}
|
|
default:
|
|
u, overflow := n.uintExp()
|
|
switch {
|
|
case overflow:
|
|
z.v = valueTypeFloat
|
|
z.f = d.floatVal()
|
|
case n.neg:
|
|
z.v = valueTypeInt
|
|
z.i = -int64(u)
|
|
case d.h.SignedInteger:
|
|
z.v = valueTypeInt
|
|
z.i = int64(u)
|
|
default:
|
|
z.v = valueTypeUint
|
|
z.u = u
|
|
}
|
|
}
|
|
// fmt.Printf("DecodeNaked: Number: %T, %v\n", v, v)
|
|
}
|
|
// 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
|
|
// - 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 and
|
|
// minimizing allocations.
|
|
//
|
|
// 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.
|
|
type JsonHandle struct {
|
|
textEncodingType
|
|
BasicHandle
|
|
// 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
|
|
|
|
// 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 uint8
|
|
}
|
|
|
|
func (h *JsonHandle) SetInterfaceExt(rt reflect.Type, tag uint64, ext InterfaceExt) (err error) {
|
|
return h.SetExt(rt, tag, &setExtWrapper{i: ext})
|
|
}
|
|
|
|
func (h *JsonHandle) newEncDriver(e *Encoder) encDriver {
|
|
hd := jsonEncDriver{e: e, h: h}
|
|
hd.bs = hd.b[:0]
|
|
|
|
hd.reset()
|
|
|
|
return &hd
|
|
}
|
|
|
|
func (h *JsonHandle) newDecDriver(d *Decoder) decDriver {
|
|
// d := jsonDecDriver{r: r.(*bytesDecReader), h: h}
|
|
hd := jsonDecDriver{d: d, h: h}
|
|
hd.bs = hd.b[:0]
|
|
hd.reset()
|
|
return &hd
|
|
}
|
|
|
|
func (e *jsonEncDriver) reset() {
|
|
e.w = e.e.w
|
|
e.se.i = e.h.RawBytesExt
|
|
if e.bs != nil {
|
|
e.bs = e.bs[:0]
|
|
}
|
|
e.d, e.dt, e.dl, e.ds = false, false, 0, ""
|
|
e.c = 0
|
|
if e.h.Indent > 0 {
|
|
e.d = true
|
|
e.ds = jsonSpaces[:e.h.Indent]
|
|
} else if e.h.Indent < 0 {
|
|
e.d = true
|
|
e.dt = true
|
|
e.ds = jsonTabs[:-(e.h.Indent)]
|
|
}
|
|
}
|
|
|
|
func (d *jsonDecDriver) reset() {
|
|
d.r = d.d.r
|
|
d.se.i = d.h.RawBytesExt
|
|
if d.bs != nil {
|
|
d.bs = d.bs[:0]
|
|
}
|
|
d.c, d.tok = 0, 0
|
|
d.n.reset()
|
|
}
|
|
|
|
var jsonEncodeTerminate = []byte{' '}
|
|
|
|
func (h *JsonHandle) rpcEncodeTerminate() []byte {
|
|
return jsonEncodeTerminate
|
|
}
|
|
|
|
var _ decDriver = (*jsonDecDriver)(nil)
|
|
var _ encDriver = (*jsonEncDriver)(nil)
|