/usr/share/gocode/src/github.com/ugorji/go/codec/json.go is in golang-github-ugorji-go-codec-dev 0.0~git20151130.0.357a44b-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 | // Copyright (c) 2012-2015 Ugorji Nwoke. All rights reserved.
// Use of this source code is governed by a MIT license found in the LICENSE file.
package codec
// By default, this json support uses base64 encoding for bytes, because you cannot
// store and read any arbitrary string in json (only unicode).
// However, the user can configre how to encode/decode bytes.
//
// This library specifically supports UTF-8 for encoding and decoding only.
//
// Note that the library will happily encode/decode things which are not valid
// json e.g. a map[int64]string. We do it for consistency. With valid json,
// we will encode and decode appropriately.
// Users can specify their map type if necessary to force it.
//
// Note:
// - we cannot use strconv.Quote and strconv.Unquote because json quotes/unquotes differently.
// We implement it here.
// - Also, strconv.ParseXXX for floats and integers
// - only works on strings resulting in unnecessary allocation and []byte-string conversion.
// - it does a lot of redundant checks, because json numbers are simpler that what it supports.
// - We parse numbers (floats and integers) directly here.
// We only delegate parsing floats if it is a hairy float which could cause a loss of precision.
// In that case, we delegate to strconv.ParseFloat.
//
// Note:
// - encode does not beautify. There is no whitespace when encoding.
// - rpc calls which take single integer arguments or write single numeric arguments will need care.
// Top-level methods of json(End|Dec)Driver (which are implementations of (en|de)cDriver
// MUST not call one-another.
import (
"bytes"
"encoding/base64"
"fmt"
"reflect"
"strconv"
"unicode/utf16"
"unicode/utf8"
)
//--------------------------------
var (
jsonLiterals = [...]byte{'t', 'r', 'u', 'e', 'f', 'a', 'l', 's', 'e', 'n', 'u', 'l', 'l'}
jsonFloat64Pow10 = [...]float64{
1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
1e20, 1e21, 1e22,
}
jsonUint64Pow10 = [...]uint64{
1e0, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9,
1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, 1e19,
}
// jsonTabs and jsonSpaces are used as caches for indents
jsonTabs, jsonSpaces string
)
const (
// jsonUnreadAfterDecNum controls whether we unread after decoding a number.
//
// instead of unreading, just update d.tok (iff it's not a whitespace char)
// However, doing this means that we may HOLD onto some data which belongs to another stream.
// Thus, it is safest to unread the data when done.
// keep behind a constant flag for now.
jsonUnreadAfterDecNum = true
// If !jsonValidateSymbols, decoding will be faster, by skipping some checks:
// - If we see first character of null, false or true,
// do not validate subsequent characters.
// - e.g. if we see a n, assume null and skip next 3 characters,
// and do not validate they are ull.
// P.S. Do not expect a significant decoding boost from this.
jsonValidateSymbols = true
// if jsonTruncateMantissa, truncate mantissa if trailing 0's.
// This is important because it could allow some floats to be decoded without
// deferring to strconv.ParseFloat.
jsonTruncateMantissa = true
// if mantissa >= jsonNumUintCutoff before multiplying by 10, this is an overflow
jsonNumUintCutoff = (1<<64-1)/uint64(10) + 1 // cutoff64(base)
// if mantissa >= jsonNumUintMaxVal, this is an overflow
jsonNumUintMaxVal = 1<<uint64(64) - 1
// jsonNumDigitsUint64Largest = 19
jsonSpacesOrTabsLen = 128
)
func init() {
var bs [jsonSpacesOrTabsLen]byte
for i := 0; i < jsonSpacesOrTabsLen; i++ {
bs[i] = ' '
}
jsonSpaces = string(bs[:])
for i := 0; i < jsonSpacesOrTabsLen; i++ {
bs[i] = '\t'
}
jsonTabs = string(bs[:])
}
type jsonEncDriver struct {
e *Encoder
w encWriter
h *JsonHandle
b [64]byte // scratch
bs []byte // scratch
se setExtWrapper
ds string // indent string
dl uint16 // indent level
dt bool // indent using tabs
d bool // indent
c containerState
noBuiltInTypes
}
// indent is done as below:
// - newline and indent are added before each mapKey or arrayElem
// - newline and indent are added before each ending,
// except there was no entry (so we can have {} or [])
func (e *jsonEncDriver) sendContainerState(c containerState) {
// determine whether to output separators
if c == containerMapKey {
if e.c != containerMapStart {
e.w.writen1(',')
}
if e.d {
e.writeIndent()
}
} else if c == containerMapValue {
if e.d {
e.w.writen2(':', ' ')
} else {
e.w.writen1(':')
}
} else if c == containerMapEnd {
if e.d {
e.dl--
if e.c != containerMapStart {
e.writeIndent()
}
}
e.w.writen1('}')
} else if c == containerArrayElem {
if e.c != containerArrayStart {
e.w.writen1(',')
}
if e.d {
e.writeIndent()
}
} else if c == containerArrayEnd {
if e.d {
e.dl--
if e.c != containerArrayStart {
e.writeIndent()
}
}
e.w.writen1(']')
}
e.c = c
}
func (e *jsonEncDriver) writeIndent() {
e.w.writen1('\n')
if x := len(e.ds) * int(e.dl); x <= jsonSpacesOrTabsLen {
if e.dt {
e.w.writestr(jsonTabs[:x])
} else {
e.w.writestr(jsonSpaces[:x])
}
} else {
for i := uint16(0); i < e.dl; i++ {
e.w.writestr(e.ds)
}
}
}
func (e *jsonEncDriver) EncodeNil() {
e.w.writeb(jsonLiterals[9:13]) // null
}
func (e *jsonEncDriver) EncodeBool(b bool) {
if b {
e.w.writeb(jsonLiterals[0:4]) // true
} else {
e.w.writeb(jsonLiterals[4:9]) // false
}
}
func (e *jsonEncDriver) EncodeFloat32(f float32) {
e.w.writeb(strconv.AppendFloat(e.b[:0], float64(f), 'E', -1, 32))
}
func (e *jsonEncDriver) EncodeFloat64(f float64) {
// e.w.writestr(strconv.FormatFloat(f, 'E', -1, 64))
e.w.writeb(strconv.AppendFloat(e.b[:0], f, 'E', -1, 64))
}
func (e *jsonEncDriver) EncodeInt(v int64) {
e.w.writeb(strconv.AppendInt(e.b[:0], v, 10))
}
func (e *jsonEncDriver) EncodeUint(v uint64) {
e.w.writeb(strconv.AppendUint(e.b[:0], v, 10))
}
func (e *jsonEncDriver) EncodeExt(rv interface{}, xtag uint64, ext Ext, en *Encoder) {
if v := ext.ConvertExt(rv); v == nil {
e.w.writeb(jsonLiterals[9:13]) // null // e.EncodeNil()
} else {
en.encode(v)
}
}
func (e *jsonEncDriver) EncodeRawExt(re *RawExt, en *Encoder) {
// only encodes re.Value (never re.Data)
if re.Value == nil {
e.w.writeb(jsonLiterals[9:13]) // null // e.EncodeNil()
} else {
en.encode(re.Value)
}
}
func (e *jsonEncDriver) EncodeArrayStart(length int) {
if e.d {
e.dl++
}
e.w.writen1('[')
e.c = containerArrayStart
}
func (e *jsonEncDriver) EncodeMapStart(length int) {
if e.d {
e.dl++
}
e.w.writen1('{')
e.c = containerMapStart
}
func (e *jsonEncDriver) EncodeString(c charEncoding, v string) {
// e.w.writestr(strconv.Quote(v))
e.quoteStr(v)
}
func (e *jsonEncDriver) EncodeSymbol(v string) {
// e.EncodeString(c_UTF8, v)
e.quoteStr(v)
}
func (e *jsonEncDriver) EncodeStringBytes(c charEncoding, v []byte) {
// if encoding raw bytes and RawBytesExt is configured, use it to encode
if c == c_RAW && e.se.i != nil {
e.EncodeExt(v, 0, &e.se, e.e)
return
}
if c == c_RAW {
slen := base64.StdEncoding.EncodedLen(len(v))
if cap(e.bs) >= slen {
e.bs = e.bs[:slen]
} else {
e.bs = make([]byte, slen)
}
base64.StdEncoding.Encode(e.bs, v)
e.w.writen1('"')
e.w.writeb(e.bs)
e.w.writen1('"')
} else {
// e.EncodeString(c, string(v))
e.quoteStr(stringView(v))
}
}
func (e *jsonEncDriver) EncodeAsis(v []byte) {
e.w.writeb(v)
}
func (e *jsonEncDriver) quoteStr(s string) {
// adapted from std pkg encoding/json
const hex = "0123456789abcdef"
w := e.w
w.writen1('"')
start := 0
for i := 0; i < len(s); {
if b := s[i]; b < utf8.RuneSelf {
if 0x20 <= b && b != '\\' && b != '"' && b != '<' && b != '>' && b != '&' {
i++
continue
}
if start < i {
w.writestr(s[start:i])
}
switch b {
case '\\', '"':
w.writen2('\\', b)
case '\n':
w.writen2('\\', 'n')
case '\r':
w.writen2('\\', 'r')
case '\b':
w.writen2('\\', 'b')
case '\f':
w.writen2('\\', 'f')
case '\t':
w.writen2('\\', 't')
default:
// encode all bytes < 0x20 (except \r, \n).
// also encode < > & to prevent security holes when served to some browsers.
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.
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 jsonNum struct {
// bytes []byte // may have [+-.eE0-9]
mantissa uint64 // where mantissa ends, and maybe dot begins.
exponent int16 // exponent value.
manOverflow bool
neg bool // started with -. No initial sign in the bytes above.
dot bool // has dot
explicitExponent bool // explicit exponent
}
func (x *jsonNum) reset() {
x.manOverflow = false
x.neg = false
x.dot = false
x.explicitExponent = false
x.mantissa = 0
x.exponent = 0
}
// uintExp is called only if exponent > 0.
func (x *jsonNum) uintExp() (n uint64, overflow bool) {
n = x.mantissa
e := x.exponent
if e >= int16(len(jsonUint64Pow10)) {
overflow = true
return
}
n *= jsonUint64Pow10[e]
if n < x.mantissa || n > jsonNumUintMaxVal {
overflow = true
return
}
return
// for i := int16(0); i < e; i++ {
// if n >= jsonNumUintCutoff {
// overflow = true
// return
// }
// n *= 10
// }
// return
}
// these constants are only used withn floatVal.
// They are brought out, so that floatVal can be inlined.
const (
jsonUint64MantissaBits = 52
jsonMaxExponent = int16(len(jsonFloat64Pow10)) - 1
)
func (x *jsonNum) floatVal() (f float64, parseUsingStrConv bool) {
// We do not want to lose precision.
// Consequently, we will delegate to strconv.ParseFloat if any of the following happen:
// - There are more digits than in math.MaxUint64: 18446744073709551615 (20 digits)
// We expect up to 99.... (19 digits)
// - The mantissa cannot fit into a 52 bits of uint64
// - The exponent is beyond our scope ie beyong 22.
parseUsingStrConv = x.manOverflow ||
x.exponent > jsonMaxExponent ||
(x.exponent < 0 && -(x.exponent) > jsonMaxExponent) ||
x.mantissa>>jsonUint64MantissaBits != 0
if parseUsingStrConv {
return
}
// all good. so handle parse here.
f = float64(x.mantissa)
// fmt.Printf(".Float: uint64 value: %v, float: %v\n", m, f)
if x.neg {
f = -f
}
if x.exponent > 0 {
f *= jsonFloat64Pow10[x.exponent]
} else if x.exponent < 0 {
f /= jsonFloat64Pow10[-x.exponent]
}
return
}
type jsonDecDriver struct {
noBuiltInTypes
d *Decoder
h *JsonHandle
r decReader
c containerState
// tok is used to store the token read right after skipWhiteSpace.
tok uint8
bstr [8]byte // scratch used for string \UXXX parsing
b [64]byte // scratch, used for parsing strings or numbers
b2 [64]byte // scratch, used only for decodeBytes (after base64)
bs []byte // scratch. Initialized from b. Used for parsing strings or numbers.
se setExtWrapper
n jsonNum
}
func jsonIsWS(b byte) bool {
return b == ' ' || b == '\t' || b == '\r' || b == '\n'
}
// // This will skip whitespace characters and return the next byte to read.
// // The next byte determines what the value will be one of.
// func (d *jsonDecDriver) skipWhitespace() {
// // fast-path: do not enter loop. Just check first (in case no whitespace).
// b := d.r.readn1()
// if jsonIsWS(b) {
// r := d.r
// for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
// }
// }
// d.tok = b
// }
func (d *jsonDecDriver) uncacheRead() {
if d.tok != 0 {
d.r.unreadn1()
d.tok = 0
}
}
func (d *jsonDecDriver) sendContainerState(c containerState) {
if d.tok == 0 {
var b byte
r := d.r
for b = r.readn1(); jsonIsWS(b); b = r.readn1() {
}
d.tok = b
}
var xc uint8 // char expected
if c == containerMapKey {
if d.c != containerMapStart {
xc = ','
}
} else if c == containerMapValue {
xc = ':'
} 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
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]
// 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
}
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
}
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)
|