mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-18 19:10:21 +00:00
5a66991bb3
updating the kubernetes release to the latest in main go.mod Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
725 lines
17 KiB
Go
725 lines
17 KiB
Go
// Copyright (c) Faye Amacker. All rights reserved.
|
|
// Licensed under the MIT License. See LICENSE in the project root for license information.
|
|
|
|
package cbor
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/base32"
|
|
"encoding/base64"
|
|
"encoding/hex"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"math"
|
|
"math/big"
|
|
"strconv"
|
|
"unicode/utf16"
|
|
"unicode/utf8"
|
|
|
|
"github.com/x448/float16"
|
|
)
|
|
|
|
// DiagMode is the main interface for CBOR diagnostic notation.
|
|
type DiagMode interface {
|
|
// Diagnose returns extended diagnostic notation (EDN) of CBOR data items using this DiagMode.
|
|
Diagnose([]byte) (string, error)
|
|
|
|
// DiagnoseFirst returns extended diagnostic notation (EDN) of the first CBOR data item using the DiagMode. Any remaining bytes are returned in rest.
|
|
DiagnoseFirst([]byte) (string, []byte, error)
|
|
|
|
// DiagOptions returns user specified options used to create this DiagMode.
|
|
DiagOptions() DiagOptions
|
|
}
|
|
|
|
// ByteStringEncoding specifies the base encoding that byte strings are notated.
|
|
type ByteStringEncoding uint8
|
|
|
|
const (
|
|
// ByteStringBase16Encoding encodes byte strings in base16, without padding.
|
|
ByteStringBase16Encoding ByteStringEncoding = iota
|
|
|
|
// ByteStringBase32Encoding encodes byte strings in base32, without padding.
|
|
ByteStringBase32Encoding
|
|
|
|
// ByteStringBase32HexEncoding encodes byte strings in base32hex, without padding.
|
|
ByteStringBase32HexEncoding
|
|
|
|
// ByteStringBase64Encoding encodes byte strings in base64url, without padding.
|
|
ByteStringBase64Encoding
|
|
|
|
maxByteStringEncoding
|
|
)
|
|
|
|
func (bse ByteStringEncoding) valid() error {
|
|
if bse >= maxByteStringEncoding {
|
|
return errors.New("cbor: invalid ByteStringEncoding " + strconv.Itoa(int(bse)))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// DiagOptions specifies Diag options.
|
|
type DiagOptions struct {
|
|
// ByteStringEncoding specifies the base encoding that byte strings are notated.
|
|
// Default is ByteStringBase16Encoding.
|
|
ByteStringEncoding ByteStringEncoding
|
|
|
|
// ByteStringHexWhitespace specifies notating with whitespace in byte string
|
|
// when ByteStringEncoding is ByteStringBase16Encoding.
|
|
ByteStringHexWhitespace bool
|
|
|
|
// ByteStringText specifies notating with text in byte string
|
|
// if it is a valid UTF-8 text.
|
|
ByteStringText bool
|
|
|
|
// ByteStringEmbeddedCBOR specifies notating embedded CBOR in byte string
|
|
// if it is a valid CBOR bytes.
|
|
ByteStringEmbeddedCBOR bool
|
|
|
|
// CBORSequence specifies notating CBOR sequences.
|
|
// otherwise, it returns an error if there are more bytes after the first CBOR.
|
|
CBORSequence bool
|
|
|
|
// FloatPrecisionIndicator specifies appending a suffix to indicate float precision.
|
|
// Refer to https://www.rfc-editor.org/rfc/rfc8949.html#name-encoding-indicators.
|
|
FloatPrecisionIndicator bool
|
|
|
|
// MaxNestedLevels specifies the max nested levels allowed for any combination of CBOR array, maps, and tags.
|
|
// Default is 32 levels and it can be set to [4, 65535]. Note that higher maximum levels of nesting can
|
|
// require larger amounts of stack to deserialize. Don't increase this higher than you require.
|
|
MaxNestedLevels int
|
|
|
|
// MaxArrayElements specifies the max number of elements for CBOR arrays.
|
|
// Default is 128*1024=131072 and it can be set to [16, 2147483647]
|
|
MaxArrayElements int
|
|
|
|
// MaxMapPairs specifies the max number of key-value pairs for CBOR maps.
|
|
// Default is 128*1024=131072 and it can be set to [16, 2147483647]
|
|
MaxMapPairs int
|
|
}
|
|
|
|
// DiagMode returns a DiagMode with immutable options.
|
|
func (opts DiagOptions) DiagMode() (DiagMode, error) {
|
|
return opts.diagMode()
|
|
}
|
|
|
|
func (opts DiagOptions) diagMode() (*diagMode, error) {
|
|
if err := opts.ByteStringEncoding.valid(); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
decMode, err := DecOptions{
|
|
MaxNestedLevels: opts.MaxNestedLevels,
|
|
MaxArrayElements: opts.MaxArrayElements,
|
|
MaxMapPairs: opts.MaxMapPairs,
|
|
}.decMode()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &diagMode{
|
|
byteStringEncoding: opts.ByteStringEncoding,
|
|
byteStringHexWhitespace: opts.ByteStringHexWhitespace,
|
|
byteStringText: opts.ByteStringText,
|
|
byteStringEmbeddedCBOR: opts.ByteStringEmbeddedCBOR,
|
|
cborSequence: opts.CBORSequence,
|
|
floatPrecisionIndicator: opts.FloatPrecisionIndicator,
|
|
decMode: decMode,
|
|
}, nil
|
|
}
|
|
|
|
type diagMode struct {
|
|
byteStringEncoding ByteStringEncoding
|
|
byteStringHexWhitespace bool
|
|
byteStringText bool
|
|
byteStringEmbeddedCBOR bool
|
|
cborSequence bool
|
|
floatPrecisionIndicator bool
|
|
decMode *decMode
|
|
}
|
|
|
|
// DiagOptions returns user specified options used to create this DiagMode.
|
|
func (dm *diagMode) DiagOptions() DiagOptions {
|
|
return DiagOptions{
|
|
ByteStringEncoding: dm.byteStringEncoding,
|
|
ByteStringHexWhitespace: dm.byteStringHexWhitespace,
|
|
ByteStringText: dm.byteStringText,
|
|
ByteStringEmbeddedCBOR: dm.byteStringEmbeddedCBOR,
|
|
CBORSequence: dm.cborSequence,
|
|
FloatPrecisionIndicator: dm.floatPrecisionIndicator,
|
|
MaxNestedLevels: dm.decMode.maxNestedLevels,
|
|
MaxArrayElements: dm.decMode.maxArrayElements,
|
|
MaxMapPairs: dm.decMode.maxMapPairs,
|
|
}
|
|
}
|
|
|
|
// Diagnose returns extended diagnostic notation (EDN) of CBOR data items using the DiagMode.
|
|
func (dm *diagMode) Diagnose(data []byte) (string, error) {
|
|
return newDiagnose(data, dm.decMode, dm).diag(dm.cborSequence)
|
|
}
|
|
|
|
// DiagnoseFirst returns extended diagnostic notation (EDN) of the first CBOR data item using the DiagMode. Any remaining bytes are returned in rest.
|
|
func (dm *diagMode) DiagnoseFirst(data []byte) (diagNotation string, rest []byte, err error) {
|
|
return newDiagnose(data, dm.decMode, dm).diagFirst()
|
|
}
|
|
|
|
var defaultDiagMode, _ = DiagOptions{}.diagMode()
|
|
|
|
// Diagnose returns extended diagnostic notation (EDN) of CBOR data items
|
|
// using the default diagnostic mode.
|
|
//
|
|
// Refer to https://www.rfc-editor.org/rfc/rfc8949.html#name-diagnostic-notation.
|
|
func Diagnose(data []byte) (string, error) {
|
|
return defaultDiagMode.Diagnose(data)
|
|
}
|
|
|
|
// Diagnose returns extended diagnostic notation (EDN) of the first CBOR data item using the DiagMode. Any remaining bytes are returned in rest.
|
|
func DiagnoseFirst(data []byte) (diagNotation string, rest []byte, err error) {
|
|
return defaultDiagMode.DiagnoseFirst(data)
|
|
}
|
|
|
|
type diagnose struct {
|
|
dm *diagMode
|
|
d *decoder
|
|
w *bytes.Buffer
|
|
}
|
|
|
|
func newDiagnose(data []byte, decm *decMode, diagm *diagMode) *diagnose {
|
|
return &diagnose{
|
|
dm: diagm,
|
|
d: &decoder{data: data, dm: decm},
|
|
w: &bytes.Buffer{},
|
|
}
|
|
}
|
|
|
|
func (di *diagnose) diag(cborSequence bool) (string, error) {
|
|
// CBOR Sequence
|
|
firstItem := true
|
|
for {
|
|
switch err := di.wellformed(cborSequence); err {
|
|
case nil:
|
|
if !firstItem {
|
|
di.w.WriteString(", ")
|
|
}
|
|
firstItem = false
|
|
if itemErr := di.item(); itemErr != nil {
|
|
return di.w.String(), itemErr
|
|
}
|
|
|
|
case io.EOF:
|
|
if firstItem {
|
|
return di.w.String(), err
|
|
}
|
|
return di.w.String(), nil
|
|
|
|
default:
|
|
return di.w.String(), err
|
|
}
|
|
}
|
|
}
|
|
|
|
func (di *diagnose) diagFirst() (diagNotation string, rest []byte, err error) {
|
|
err = di.wellformed(true)
|
|
if err == nil {
|
|
err = di.item()
|
|
}
|
|
|
|
if err == nil {
|
|
// Return EDN and the rest of the data slice (which might be len 0)
|
|
return di.w.String(), di.d.data[di.d.off:], nil
|
|
}
|
|
|
|
return di.w.String(), nil, err
|
|
}
|
|
|
|
func (di *diagnose) wellformed(allowExtraData bool) error {
|
|
off := di.d.off
|
|
err := di.d.wellformed(allowExtraData, false)
|
|
di.d.off = off
|
|
return err
|
|
}
|
|
|
|
func (di *diagnose) item() error { //nolint:gocyclo
|
|
initialByte := di.d.data[di.d.off]
|
|
switch initialByte {
|
|
case cborByteStringWithIndefiniteLengthHead,
|
|
cborTextStringWithIndefiniteLengthHead: // indefinite-length byte/text string
|
|
di.d.off++
|
|
if isBreakFlag(di.d.data[di.d.off]) {
|
|
di.d.off++
|
|
switch initialByte {
|
|
case cborByteStringWithIndefiniteLengthHead:
|
|
// indefinite-length bytes with no chunks.
|
|
di.w.WriteString(`''_`)
|
|
return nil
|
|
case cborTextStringWithIndefiniteLengthHead:
|
|
// indefinite-length text with no chunks.
|
|
di.w.WriteString(`""_`)
|
|
return nil
|
|
}
|
|
}
|
|
|
|
di.w.WriteString("(_ ")
|
|
|
|
i := 0
|
|
for !di.d.foundBreak() {
|
|
if i > 0 {
|
|
di.w.WriteString(", ")
|
|
}
|
|
|
|
i++
|
|
// wellformedIndefiniteString() already checked that the next item is a byte/text string.
|
|
if err := di.item(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
di.w.WriteByte(')')
|
|
return nil
|
|
|
|
case cborArrayWithIndefiniteLengthHead: // indefinite-length array
|
|
di.d.off++
|
|
di.w.WriteString("[_ ")
|
|
|
|
i := 0
|
|
for !di.d.foundBreak() {
|
|
if i > 0 {
|
|
di.w.WriteString(", ")
|
|
}
|
|
|
|
i++
|
|
if err := di.item(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
di.w.WriteByte(']')
|
|
return nil
|
|
|
|
case cborMapWithIndefiniteLengthHead: // indefinite-length map
|
|
di.d.off++
|
|
di.w.WriteString("{_ ")
|
|
|
|
i := 0
|
|
for !di.d.foundBreak() {
|
|
if i > 0 {
|
|
di.w.WriteString(", ")
|
|
}
|
|
|
|
i++
|
|
// key
|
|
if err := di.item(); err != nil {
|
|
return err
|
|
}
|
|
|
|
di.w.WriteString(": ")
|
|
|
|
// value
|
|
if err := di.item(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
di.w.WriteByte('}')
|
|
return nil
|
|
}
|
|
|
|
t := di.d.nextCBORType()
|
|
switch t {
|
|
case cborTypePositiveInt:
|
|
_, _, val := di.d.getHead()
|
|
di.w.WriteString(strconv.FormatUint(val, 10))
|
|
return nil
|
|
|
|
case cborTypeNegativeInt:
|
|
_, _, val := di.d.getHead()
|
|
if val > math.MaxInt64 {
|
|
// CBOR negative integer overflows int64, use big.Int to store value.
|
|
bi := new(big.Int)
|
|
bi.SetUint64(val)
|
|
bi.Add(bi, big.NewInt(1))
|
|
bi.Neg(bi)
|
|
di.w.WriteString(bi.String())
|
|
return nil
|
|
}
|
|
|
|
nValue := int64(-1) ^ int64(val)
|
|
di.w.WriteString(strconv.FormatInt(nValue, 10))
|
|
return nil
|
|
|
|
case cborTypeByteString:
|
|
b, _ := di.d.parseByteString()
|
|
return di.encodeByteString(b)
|
|
|
|
case cborTypeTextString:
|
|
b, err := di.d.parseTextString()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return di.encodeTextString(string(b), '"')
|
|
|
|
case cborTypeArray:
|
|
_, _, val := di.d.getHead()
|
|
count := int(val)
|
|
di.w.WriteByte('[')
|
|
|
|
for i := 0; i < count; i++ {
|
|
if i > 0 {
|
|
di.w.WriteString(", ")
|
|
}
|
|
if err := di.item(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
di.w.WriteByte(']')
|
|
return nil
|
|
|
|
case cborTypeMap:
|
|
_, _, val := di.d.getHead()
|
|
count := int(val)
|
|
di.w.WriteByte('{')
|
|
|
|
for i := 0; i < count; i++ {
|
|
if i > 0 {
|
|
di.w.WriteString(", ")
|
|
}
|
|
// key
|
|
if err := di.item(); err != nil {
|
|
return err
|
|
}
|
|
di.w.WriteString(": ")
|
|
// value
|
|
if err := di.item(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
di.w.WriteByte('}')
|
|
return nil
|
|
|
|
case cborTypeTag:
|
|
_, _, tagNum := di.d.getHead()
|
|
switch tagNum {
|
|
case tagNumUnsignedBignum:
|
|
if nt := di.d.nextCBORType(); nt != cborTypeByteString {
|
|
return newInadmissibleTagContentTypeError(
|
|
tagNumUnsignedBignum,
|
|
"byte string",
|
|
nt.String())
|
|
}
|
|
|
|
b, _ := di.d.parseByteString()
|
|
bi := new(big.Int).SetBytes(b)
|
|
di.w.WriteString(bi.String())
|
|
return nil
|
|
|
|
case tagNumNegativeBignum:
|
|
if nt := di.d.nextCBORType(); nt != cborTypeByteString {
|
|
return newInadmissibleTagContentTypeError(
|
|
tagNumNegativeBignum,
|
|
"byte string",
|
|
nt.String(),
|
|
)
|
|
}
|
|
|
|
b, _ := di.d.parseByteString()
|
|
bi := new(big.Int).SetBytes(b)
|
|
bi.Add(bi, big.NewInt(1))
|
|
bi.Neg(bi)
|
|
di.w.WriteString(bi.String())
|
|
return nil
|
|
|
|
default:
|
|
di.w.WriteString(strconv.FormatUint(tagNum, 10))
|
|
di.w.WriteByte('(')
|
|
if err := di.item(); err != nil {
|
|
return err
|
|
}
|
|
di.w.WriteByte(')')
|
|
return nil
|
|
}
|
|
|
|
case cborTypePrimitives:
|
|
_, ai, val := di.d.getHead()
|
|
switch ai {
|
|
case additionalInformationAsFalse:
|
|
di.w.WriteString("false")
|
|
return nil
|
|
|
|
case additionalInformationAsTrue:
|
|
di.w.WriteString("true")
|
|
return nil
|
|
|
|
case additionalInformationAsNull:
|
|
di.w.WriteString("null")
|
|
return nil
|
|
|
|
case additionalInformationAsUndefined:
|
|
di.w.WriteString("undefined")
|
|
return nil
|
|
|
|
case additionalInformationAsFloat16,
|
|
additionalInformationAsFloat32,
|
|
additionalInformationAsFloat64:
|
|
return di.encodeFloat(ai, val)
|
|
|
|
default:
|
|
di.w.WriteString("simple(")
|
|
di.w.WriteString(strconv.FormatUint(val, 10))
|
|
di.w.WriteByte(')')
|
|
return nil
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// writeU16 format a rune as "\uxxxx"
|
|
func (di *diagnose) writeU16(val rune) {
|
|
di.w.WriteString("\\u")
|
|
var in [2]byte
|
|
in[0] = byte(val >> 8)
|
|
in[1] = byte(val)
|
|
sz := hex.EncodedLen(len(in))
|
|
di.w.Grow(sz)
|
|
dst := di.w.Bytes()[di.w.Len() : di.w.Len()+sz]
|
|
hex.Encode(dst, in[:])
|
|
di.w.Write(dst)
|
|
}
|
|
|
|
var rawBase32Encoding = base32.StdEncoding.WithPadding(base32.NoPadding)
|
|
var rawBase32HexEncoding = base32.HexEncoding.WithPadding(base32.NoPadding)
|
|
|
|
func (di *diagnose) encodeByteString(val []byte) error {
|
|
if len(val) > 0 {
|
|
if di.dm.byteStringText && utf8.Valid(val) {
|
|
return di.encodeTextString(string(val), '\'')
|
|
}
|
|
|
|
if di.dm.byteStringEmbeddedCBOR {
|
|
di2 := newDiagnose(val, di.dm.decMode, di.dm)
|
|
// should always notating embedded CBOR sequence.
|
|
if str, err := di2.diag(true); err == nil {
|
|
di.w.WriteString("<<")
|
|
di.w.WriteString(str)
|
|
di.w.WriteString(">>")
|
|
return nil
|
|
}
|
|
}
|
|
}
|
|
|
|
switch di.dm.byteStringEncoding {
|
|
case ByteStringBase16Encoding:
|
|
di.w.WriteString("h'")
|
|
if di.dm.byteStringHexWhitespace {
|
|
sz := hex.EncodedLen(len(val))
|
|
if len(val) > 0 {
|
|
sz += len(val) - 1
|
|
}
|
|
di.w.Grow(sz)
|
|
|
|
dst := di.w.Bytes()[di.w.Len():]
|
|
for i := range val {
|
|
if i > 0 {
|
|
dst = append(dst, ' ')
|
|
}
|
|
hex.Encode(dst[len(dst):len(dst)+2], val[i:i+1])
|
|
dst = dst[:len(dst)+2]
|
|
}
|
|
di.w.Write(dst)
|
|
} else {
|
|
sz := hex.EncodedLen(len(val))
|
|
di.w.Grow(sz)
|
|
dst := di.w.Bytes()[di.w.Len() : di.w.Len()+sz]
|
|
hex.Encode(dst, val)
|
|
di.w.Write(dst)
|
|
}
|
|
di.w.WriteByte('\'')
|
|
return nil
|
|
|
|
case ByteStringBase32Encoding:
|
|
di.w.WriteString("b32'")
|
|
sz := rawBase32Encoding.EncodedLen(len(val))
|
|
di.w.Grow(sz)
|
|
dst := di.w.Bytes()[di.w.Len() : di.w.Len()+sz]
|
|
rawBase32Encoding.Encode(dst, val)
|
|
di.w.Write(dst)
|
|
di.w.WriteByte('\'')
|
|
return nil
|
|
|
|
case ByteStringBase32HexEncoding:
|
|
di.w.WriteString("h32'")
|
|
sz := rawBase32HexEncoding.EncodedLen(len(val))
|
|
di.w.Grow(sz)
|
|
dst := di.w.Bytes()[di.w.Len() : di.w.Len()+sz]
|
|
rawBase32HexEncoding.Encode(dst, val)
|
|
di.w.Write(dst)
|
|
di.w.WriteByte('\'')
|
|
return nil
|
|
|
|
case ByteStringBase64Encoding:
|
|
di.w.WriteString("b64'")
|
|
sz := base64.RawURLEncoding.EncodedLen(len(val))
|
|
di.w.Grow(sz)
|
|
dst := di.w.Bytes()[di.w.Len() : di.w.Len()+sz]
|
|
base64.RawURLEncoding.Encode(dst, val)
|
|
di.w.Write(dst)
|
|
di.w.WriteByte('\'')
|
|
return nil
|
|
|
|
default:
|
|
// It should not be possible for users to construct a *diagMode with an invalid byte
|
|
// string encoding.
|
|
panic(fmt.Sprintf("diagmode has invalid ByteStringEncoding %v", di.dm.byteStringEncoding))
|
|
}
|
|
}
|
|
|
|
const utf16SurrSelf = rune(0x10000)
|
|
|
|
// quote should be either `'` or `"`
|
|
func (di *diagnose) encodeTextString(val string, quote byte) error {
|
|
di.w.WriteByte(quote)
|
|
|
|
for i := 0; i < len(val); {
|
|
if b := val[i]; b < utf8.RuneSelf {
|
|
switch {
|
|
case b == '\t', b == '\n', b == '\r', b == '\\', b == quote:
|
|
di.w.WriteByte('\\')
|
|
|
|
switch b {
|
|
case '\t':
|
|
b = 't'
|
|
case '\n':
|
|
b = 'n'
|
|
case '\r':
|
|
b = 'r'
|
|
}
|
|
di.w.WriteByte(b)
|
|
|
|
case b >= ' ' && b <= '~':
|
|
di.w.WriteByte(b)
|
|
|
|
default:
|
|
di.writeU16(rune(b))
|
|
}
|
|
|
|
i++
|
|
continue
|
|
}
|
|
|
|
c, size := utf8.DecodeRuneInString(val[i:])
|
|
switch {
|
|
case c == utf8.RuneError:
|
|
return &SemanticError{"cbor: invalid UTF-8 string"}
|
|
|
|
case c < utf16SurrSelf:
|
|
di.writeU16(c)
|
|
|
|
default:
|
|
c1, c2 := utf16.EncodeRune(c)
|
|
di.writeU16(c1)
|
|
di.writeU16(c2)
|
|
}
|
|
|
|
i += size
|
|
}
|
|
|
|
di.w.WriteByte(quote)
|
|
return nil
|
|
}
|
|
|
|
func (di *diagnose) encodeFloat(ai byte, val uint64) error {
|
|
f64 := float64(0)
|
|
switch ai {
|
|
case additionalInformationAsFloat16:
|
|
f16 := float16.Frombits(uint16(val))
|
|
switch {
|
|
case f16.IsNaN():
|
|
di.w.WriteString("NaN")
|
|
return nil
|
|
case f16.IsInf(1):
|
|
di.w.WriteString("Infinity")
|
|
return nil
|
|
case f16.IsInf(-1):
|
|
di.w.WriteString("-Infinity")
|
|
return nil
|
|
default:
|
|
f64 = float64(f16.Float32())
|
|
}
|
|
|
|
case additionalInformationAsFloat32:
|
|
f32 := math.Float32frombits(uint32(val))
|
|
switch {
|
|
case f32 != f32:
|
|
di.w.WriteString("NaN")
|
|
return nil
|
|
case f32 > math.MaxFloat32:
|
|
di.w.WriteString("Infinity")
|
|
return nil
|
|
case f32 < -math.MaxFloat32:
|
|
di.w.WriteString("-Infinity")
|
|
return nil
|
|
default:
|
|
f64 = float64(f32)
|
|
}
|
|
|
|
case additionalInformationAsFloat64:
|
|
f64 = math.Float64frombits(val)
|
|
switch {
|
|
case f64 != f64:
|
|
di.w.WriteString("NaN")
|
|
return nil
|
|
case f64 > math.MaxFloat64:
|
|
di.w.WriteString("Infinity")
|
|
return nil
|
|
case f64 < -math.MaxFloat64:
|
|
di.w.WriteString("-Infinity")
|
|
return nil
|
|
}
|
|
}
|
|
// Use ES6 number to string conversion which should match most JSON generators.
|
|
// Inspired by https://github.com/golang/go/blob/4df10fba1687a6d4f51d7238a403f8f2298f6a16/src/encoding/json/encode.go#L585
|
|
const bitSize = 64
|
|
b := make([]byte, 0, 32)
|
|
if abs := math.Abs(f64); abs != 0 && (abs < 1e-6 || abs >= 1e21) {
|
|
b = strconv.AppendFloat(b, f64, 'e', -1, bitSize)
|
|
// clean up e-09 to e-9
|
|
n := len(b)
|
|
if n >= 4 && string(b[n-4:n-1]) == "e-0" {
|
|
b = append(b[:n-2], b[n-1])
|
|
}
|
|
} else {
|
|
b = strconv.AppendFloat(b, f64, 'f', -1, bitSize)
|
|
}
|
|
|
|
// add decimal point and trailing zero if needed
|
|
if bytes.IndexByte(b, '.') < 0 {
|
|
if i := bytes.IndexByte(b, 'e'); i < 0 {
|
|
b = append(b, '.', '0')
|
|
} else {
|
|
b = append(b[:i+2], b[i:]...)
|
|
b[i] = '.'
|
|
b[i+1] = '0'
|
|
}
|
|
}
|
|
|
|
di.w.WriteString(string(b))
|
|
|
|
if di.dm.floatPrecisionIndicator {
|
|
switch ai {
|
|
case additionalInformationAsFloat16:
|
|
di.w.WriteString("_1")
|
|
return nil
|
|
|
|
case additionalInformationAsFloat32:
|
|
di.w.WriteString("_2")
|
|
return nil
|
|
|
|
case additionalInformationAsFloat64:
|
|
di.w.WriteString("_3")
|
|
return nil
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|