onkarkundargi | 72cfd36 | 2020-02-27 12:34:37 +0530 | [diff] [blame^] | 1 | // Copyright 2009 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package asn1 |
| 6 | |
| 7 | import ( |
| 8 | "bytes" |
| 9 | "errors" |
| 10 | "fmt" |
| 11 | "io" |
| 12 | "math/big" |
| 13 | "reflect" |
| 14 | "time" |
| 15 | "unicode/utf8" |
| 16 | ) |
| 17 | |
| 18 | // A forkableWriter is an in-memory buffer that can be |
| 19 | // 'forked' to create new forkableWriters that bracket the |
| 20 | // original. After |
| 21 | // pre, post := w.fork() |
| 22 | // the overall sequence of bytes represented is logically w+pre+post. |
| 23 | type forkableWriter struct { |
| 24 | *bytes.Buffer |
| 25 | pre, post *forkableWriter |
| 26 | } |
| 27 | |
| 28 | func newForkableWriter() *forkableWriter { |
| 29 | return &forkableWriter{new(bytes.Buffer), nil, nil} |
| 30 | } |
| 31 | |
| 32 | func (f *forkableWriter) fork() (pre, post *forkableWriter) { |
| 33 | if f.pre != nil || f.post != nil { |
| 34 | panic("have already forked") |
| 35 | } |
| 36 | f.pre = newForkableWriter() |
| 37 | f.post = newForkableWriter() |
| 38 | return f.pre, f.post |
| 39 | } |
| 40 | |
| 41 | func (f *forkableWriter) Len() (l int) { |
| 42 | l += f.Buffer.Len() |
| 43 | if f.pre != nil { |
| 44 | l += f.pre.Len() |
| 45 | } |
| 46 | if f.post != nil { |
| 47 | l += f.post.Len() |
| 48 | } |
| 49 | return |
| 50 | } |
| 51 | |
| 52 | func (f *forkableWriter) writeTo(out io.Writer) (n int, err error) { |
| 53 | n, err = out.Write(f.Bytes()) |
| 54 | if err != nil { |
| 55 | return |
| 56 | } |
| 57 | |
| 58 | var nn int |
| 59 | |
| 60 | if f.pre != nil { |
| 61 | nn, err = f.pre.writeTo(out) |
| 62 | n += nn |
| 63 | if err != nil { |
| 64 | return |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | if f.post != nil { |
| 69 | nn, err = f.post.writeTo(out) |
| 70 | n += nn |
| 71 | } |
| 72 | return |
| 73 | } |
| 74 | |
| 75 | func marshalBase128Int(out *forkableWriter, n int64) (err error) { |
| 76 | if n == 0 { |
| 77 | err = out.WriteByte(0) |
| 78 | return |
| 79 | } |
| 80 | |
| 81 | l := 0 |
| 82 | for i := n; i > 0; i >>= 7 { |
| 83 | l++ |
| 84 | } |
| 85 | |
| 86 | for i := l - 1; i >= 0; i-- { |
| 87 | o := byte(n >> uint(i*7)) |
| 88 | o &= 0x7f |
| 89 | if i != 0 { |
| 90 | o |= 0x80 |
| 91 | } |
| 92 | err = out.WriteByte(o) |
| 93 | if err != nil { |
| 94 | return |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | return nil |
| 99 | } |
| 100 | |
| 101 | func marshalInt64(out *forkableWriter, i int64) (err error) { |
| 102 | n := int64Length(i) |
| 103 | |
| 104 | for ; n > 0; n-- { |
| 105 | err = out.WriteByte(byte(i >> uint((n-1)*8))) |
| 106 | if err != nil { |
| 107 | return |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | return nil |
| 112 | } |
| 113 | |
| 114 | func int64Length(i int64) (numBytes int) { |
| 115 | numBytes = 1 |
| 116 | |
| 117 | for i > 127 { |
| 118 | numBytes++ |
| 119 | i >>= 8 |
| 120 | } |
| 121 | |
| 122 | for i < -128 { |
| 123 | numBytes++ |
| 124 | i >>= 8 |
| 125 | } |
| 126 | |
| 127 | return |
| 128 | } |
| 129 | |
| 130 | func marshalBigInt(out *forkableWriter, n *big.Int) (err error) { |
| 131 | if n.Sign() < 0 { |
| 132 | // A negative number has to be converted to two's-complement |
| 133 | // form. So we'll subtract 1 and invert. If the |
| 134 | // most-significant-bit isn't set then we'll need to pad the |
| 135 | // beginning with 0xff in order to keep the number negative. |
| 136 | nMinus1 := new(big.Int).Neg(n) |
| 137 | nMinus1.Sub(nMinus1, bigOne) |
| 138 | bytes := nMinus1.Bytes() |
| 139 | for i := range bytes { |
| 140 | bytes[i] ^= 0xff |
| 141 | } |
| 142 | if len(bytes) == 0 || bytes[0]&0x80 == 0 { |
| 143 | err = out.WriteByte(0xff) |
| 144 | if err != nil { |
| 145 | return |
| 146 | } |
| 147 | } |
| 148 | _, err = out.Write(bytes) |
| 149 | } else if n.Sign() == 0 { |
| 150 | // Zero is written as a single 0 zero rather than no bytes. |
| 151 | err = out.WriteByte(0x00) |
| 152 | } else { |
| 153 | bytes := n.Bytes() |
| 154 | if len(bytes) > 0 && bytes[0]&0x80 != 0 { |
| 155 | // We'll have to pad this with 0x00 in order to stop it |
| 156 | // looking like a negative number. |
| 157 | err = out.WriteByte(0) |
| 158 | if err != nil { |
| 159 | return |
| 160 | } |
| 161 | } |
| 162 | _, err = out.Write(bytes) |
| 163 | } |
| 164 | return |
| 165 | } |
| 166 | |
| 167 | func marshalLength(out *forkableWriter, i int) (err error) { |
| 168 | n := lengthLength(i) |
| 169 | |
| 170 | for ; n > 0; n-- { |
| 171 | err = out.WriteByte(byte(i >> uint((n-1)*8))) |
| 172 | if err != nil { |
| 173 | return |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | return nil |
| 178 | } |
| 179 | |
| 180 | func lengthLength(i int) (numBytes int) { |
| 181 | numBytes = 1 |
| 182 | for i > 255 { |
| 183 | numBytes++ |
| 184 | i >>= 8 |
| 185 | } |
| 186 | return |
| 187 | } |
| 188 | |
| 189 | func marshalTagAndLength(out *forkableWriter, t tagAndLength) (err error) { |
| 190 | b := uint8(t.class) << 6 |
| 191 | if t.isCompound { |
| 192 | b |= 0x20 |
| 193 | } |
| 194 | if t.tag >= 31 { |
| 195 | b |= 0x1f |
| 196 | err = out.WriteByte(b) |
| 197 | if err != nil { |
| 198 | return |
| 199 | } |
| 200 | err = marshalBase128Int(out, int64(t.tag)) |
| 201 | if err != nil { |
| 202 | return |
| 203 | } |
| 204 | } else { |
| 205 | b |= uint8(t.tag) |
| 206 | err = out.WriteByte(b) |
| 207 | if err != nil { |
| 208 | return |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | if t.length >= 128 { |
| 213 | l := lengthLength(t.length) |
| 214 | err = out.WriteByte(0x80 | byte(l)) |
| 215 | if err != nil { |
| 216 | return |
| 217 | } |
| 218 | err = marshalLength(out, t.length) |
| 219 | if err != nil { |
| 220 | return |
| 221 | } |
| 222 | } else { |
| 223 | err = out.WriteByte(byte(t.length)) |
| 224 | if err != nil { |
| 225 | return |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | return nil |
| 230 | } |
| 231 | |
| 232 | func marshalBitString(out *forkableWriter, b BitString) (err error) { |
| 233 | paddingBits := byte((8 - b.BitLength%8) % 8) |
| 234 | err = out.WriteByte(paddingBits) |
| 235 | if err != nil { |
| 236 | return |
| 237 | } |
| 238 | _, err = out.Write(b.Bytes) |
| 239 | return |
| 240 | } |
| 241 | |
| 242 | func marshalObjectIdentifier(out *forkableWriter, oid []int) (err error) { |
| 243 | if len(oid) < 2 || oid[0] > 2 || (oid[0] < 2 && oid[1] >= 40) { |
| 244 | return StructuralError{"invalid object identifier"} |
| 245 | } |
| 246 | |
| 247 | err = marshalBase128Int(out, int64(oid[0]*40+oid[1])) |
| 248 | if err != nil { |
| 249 | return |
| 250 | } |
| 251 | for i := 2; i < len(oid); i++ { |
| 252 | err = marshalBase128Int(out, int64(oid[i])) |
| 253 | if err != nil { |
| 254 | return |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | return |
| 259 | } |
| 260 | |
| 261 | func marshalPrintableString(out *forkableWriter, s string) (err error) { |
| 262 | b := []byte(s) |
| 263 | for _, c := range b { |
| 264 | if !isPrintable(c) { |
| 265 | return StructuralError{"PrintableString contains invalid character"} |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | _, err = out.Write(b) |
| 270 | return |
| 271 | } |
| 272 | |
| 273 | func marshalIA5String(out *forkableWriter, s string) (err error) { |
| 274 | b := []byte(s) |
| 275 | for _, c := range b { |
| 276 | if c > 127 { |
| 277 | return StructuralError{"IA5String contains invalid character"} |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | _, err = out.Write(b) |
| 282 | return |
| 283 | } |
| 284 | |
| 285 | func marshalUTF8String(out *forkableWriter, s string) (err error) { |
| 286 | _, err = out.Write([]byte(s)) |
| 287 | return |
| 288 | } |
| 289 | |
| 290 | func marshalTwoDigits(out *forkableWriter, v int) (err error) { |
| 291 | err = out.WriteByte(byte('0' + (v/10)%10)) |
| 292 | if err != nil { |
| 293 | return |
| 294 | } |
| 295 | return out.WriteByte(byte('0' + v%10)) |
| 296 | } |
| 297 | |
| 298 | func marshalFourDigits(out *forkableWriter, v int) (err error) { |
| 299 | var bytes [4]byte |
| 300 | for i := range bytes { |
| 301 | bytes[3-i] = '0' + byte(v%10) |
| 302 | v /= 10 |
| 303 | } |
| 304 | _, err = out.Write(bytes[:]) |
| 305 | return |
| 306 | } |
| 307 | |
| 308 | func outsideUTCRange(t time.Time) bool { |
| 309 | year := t.Year() |
| 310 | return year < 1950 || year >= 2050 |
| 311 | } |
| 312 | |
| 313 | func marshalUTCTime(out *forkableWriter, t time.Time) (err error) { |
| 314 | year := t.Year() |
| 315 | |
| 316 | switch { |
| 317 | case 1950 <= year && year < 2000: |
| 318 | err = marshalTwoDigits(out, year-1900) |
| 319 | case 2000 <= year && year < 2050: |
| 320 | err = marshalTwoDigits(out, year-2000) |
| 321 | default: |
| 322 | return StructuralError{"cannot represent time as UTCTime"} |
| 323 | } |
| 324 | if err != nil { |
| 325 | return |
| 326 | } |
| 327 | |
| 328 | return marshalTimeCommon(out, t) |
| 329 | } |
| 330 | |
| 331 | func marshalGeneralizedTime(out *forkableWriter, t time.Time) (err error) { |
| 332 | year := t.Year() |
| 333 | if year < 0 || year > 9999 { |
| 334 | return StructuralError{"cannot represent time as GeneralizedTime"} |
| 335 | } |
| 336 | if err = marshalFourDigits(out, year); err != nil { |
| 337 | return |
| 338 | } |
| 339 | |
| 340 | return marshalTimeCommon(out, t) |
| 341 | } |
| 342 | |
| 343 | func marshalTimeCommon(out *forkableWriter, t time.Time) (err error) { |
| 344 | _, month, day := t.Date() |
| 345 | |
| 346 | err = marshalTwoDigits(out, int(month)) |
| 347 | if err != nil { |
| 348 | return |
| 349 | } |
| 350 | |
| 351 | err = marshalTwoDigits(out, day) |
| 352 | if err != nil { |
| 353 | return |
| 354 | } |
| 355 | |
| 356 | hour, min, sec := t.Clock() |
| 357 | |
| 358 | err = marshalTwoDigits(out, hour) |
| 359 | if err != nil { |
| 360 | return |
| 361 | } |
| 362 | |
| 363 | err = marshalTwoDigits(out, min) |
| 364 | if err != nil { |
| 365 | return |
| 366 | } |
| 367 | |
| 368 | err = marshalTwoDigits(out, sec) |
| 369 | if err != nil { |
| 370 | return |
| 371 | } |
| 372 | |
| 373 | _, offset := t.Zone() |
| 374 | |
| 375 | switch { |
| 376 | case offset/60 == 0: |
| 377 | err = out.WriteByte('Z') |
| 378 | return |
| 379 | case offset > 0: |
| 380 | err = out.WriteByte('+') |
| 381 | case offset < 0: |
| 382 | err = out.WriteByte('-') |
| 383 | } |
| 384 | |
| 385 | if err != nil { |
| 386 | return |
| 387 | } |
| 388 | |
| 389 | offsetMinutes := offset / 60 |
| 390 | if offsetMinutes < 0 { |
| 391 | offsetMinutes = -offsetMinutes |
| 392 | } |
| 393 | |
| 394 | err = marshalTwoDigits(out, offsetMinutes/60) |
| 395 | if err != nil { |
| 396 | return |
| 397 | } |
| 398 | |
| 399 | err = marshalTwoDigits(out, offsetMinutes%60) |
| 400 | return |
| 401 | } |
| 402 | |
| 403 | func stripTagAndLength(in []byte) []byte { |
| 404 | _, offset, err := parseTagAndLength(in, 0) |
| 405 | if err != nil { |
| 406 | return in |
| 407 | } |
| 408 | return in[offset:] |
| 409 | } |
| 410 | |
| 411 | func marshalBody(out *forkableWriter, value reflect.Value, params fieldParameters) (err error) { |
| 412 | switch value.Type() { |
| 413 | case flagType: |
| 414 | return nil |
| 415 | case timeType: |
| 416 | t := value.Interface().(time.Time) |
| 417 | if params.timeType == TagGeneralizedTime || outsideUTCRange(t) { |
| 418 | return marshalGeneralizedTime(out, t) |
| 419 | } else { |
| 420 | return marshalUTCTime(out, t) |
| 421 | } |
| 422 | case bitStringType: |
| 423 | return marshalBitString(out, value.Interface().(BitString)) |
| 424 | case objectIdentifierType: |
| 425 | return marshalObjectIdentifier(out, value.Interface().(ObjectIdentifier)) |
| 426 | case bigIntType: |
| 427 | return marshalBigInt(out, value.Interface().(*big.Int)) |
| 428 | } |
| 429 | |
| 430 | switch v := value; v.Kind() { |
| 431 | case reflect.Bool: |
| 432 | if v.Bool() { |
| 433 | return out.WriteByte(255) |
| 434 | } else { |
| 435 | return out.WriteByte(0) |
| 436 | } |
| 437 | case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64: |
| 438 | return marshalInt64(out, v.Int()) |
| 439 | case reflect.Struct: |
| 440 | t := v.Type() |
| 441 | |
| 442 | startingField := 0 |
| 443 | |
| 444 | // If the first element of the structure is a non-empty |
| 445 | // RawContents, then we don't bother serializing the rest. |
| 446 | if t.NumField() > 0 && t.Field(0).Type == rawContentsType { |
| 447 | s := v.Field(0) |
| 448 | if s.Len() > 0 { |
| 449 | bytes := make([]byte, s.Len()) |
| 450 | for i := 0; i < s.Len(); i++ { |
| 451 | bytes[i] = uint8(s.Index(i).Uint()) |
| 452 | } |
| 453 | /* The RawContents will contain the tag and |
| 454 | * length fields but we'll also be writing |
| 455 | * those ourselves, so we strip them out of |
| 456 | * bytes */ |
| 457 | _, err = out.Write(stripTagAndLength(bytes)) |
| 458 | return |
| 459 | } else { |
| 460 | startingField = 1 |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | for i := startingField; i < t.NumField(); i++ { |
| 465 | var pre *forkableWriter |
| 466 | pre, out = out.fork() |
| 467 | err = marshalField(pre, v.Field(i), parseFieldParameters(t.Field(i).Tag.Get("asn1"))) |
| 468 | if err != nil { |
| 469 | return |
| 470 | } |
| 471 | } |
| 472 | return |
| 473 | case reflect.Slice: |
| 474 | sliceType := v.Type() |
| 475 | if sliceType.Elem().Kind() == reflect.Uint8 { |
| 476 | bytes := make([]byte, v.Len()) |
| 477 | for i := 0; i < v.Len(); i++ { |
| 478 | bytes[i] = uint8(v.Index(i).Uint()) |
| 479 | } |
| 480 | _, err = out.Write(bytes) |
| 481 | return |
| 482 | } |
| 483 | |
| 484 | // jtasn1 Pass on the tags to the members but need to unset explicit switch and implicit value |
| 485 | //var fp fieldParameters |
| 486 | params.explicit = false |
| 487 | params.tag = nil |
| 488 | for i := 0; i < v.Len(); i++ { |
| 489 | var pre *forkableWriter |
| 490 | pre, out = out.fork() |
| 491 | err = marshalField(pre, v.Index(i), params) |
| 492 | if err != nil { |
| 493 | return |
| 494 | } |
| 495 | } |
| 496 | return |
| 497 | case reflect.String: |
| 498 | switch params.stringType { |
| 499 | case TagIA5String: |
| 500 | return marshalIA5String(out, v.String()) |
| 501 | case TagPrintableString: |
| 502 | return marshalPrintableString(out, v.String()) |
| 503 | default: |
| 504 | return marshalUTF8String(out, v.String()) |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | return StructuralError{"unknown Go type"} |
| 509 | } |
| 510 | |
| 511 | func marshalField(out *forkableWriter, v reflect.Value, params fieldParameters) (err error) { |
| 512 | if !v.IsValid() { |
| 513 | return fmt.Errorf("asn1: cannot marshal nil value") |
| 514 | } |
| 515 | // If the field is an interface{} then recurse into it. |
| 516 | if v.Kind() == reflect.Interface && v.Type().NumMethod() == 0 { |
| 517 | return marshalField(out, v.Elem(), params) |
| 518 | } |
| 519 | |
| 520 | if v.Kind() == reflect.Slice && v.Len() == 0 && params.omitEmpty { |
| 521 | return |
| 522 | } |
| 523 | |
| 524 | if params.optional && params.defaultValue != nil && canHaveDefaultValue(v.Kind()) { |
| 525 | defaultValue := reflect.New(v.Type()).Elem() |
| 526 | defaultValue.SetInt(*params.defaultValue) |
| 527 | |
| 528 | if reflect.DeepEqual(v.Interface(), defaultValue.Interface()) { |
| 529 | return |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | // If no default value is given then the zero value for the type is |
| 534 | // assumed to be the default value. This isn't obviously the correct |
| 535 | // behaviour, but it's what Go has traditionally done. |
| 536 | if params.optional && params.defaultValue == nil { |
| 537 | if reflect.DeepEqual(v.Interface(), reflect.Zero(v.Type()).Interface()) { |
| 538 | return |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | if v.Type() == rawValueType { |
| 543 | rv := v.Interface().(RawValue) |
| 544 | if len(rv.FullBytes) != 0 { |
| 545 | _, err = out.Write(rv.FullBytes) |
| 546 | } else { |
| 547 | err = marshalTagAndLength(out, tagAndLength{rv.Class, rv.Tag, len(rv.Bytes), rv.IsCompound}) |
| 548 | if err != nil { |
| 549 | return |
| 550 | } |
| 551 | _, err = out.Write(rv.Bytes) |
| 552 | } |
| 553 | return |
| 554 | } |
| 555 | |
| 556 | tag, isCompound, ok := getUniversalType(v.Type()) |
| 557 | if !ok { |
| 558 | err = StructuralError{fmt.Sprintf("unknown Go type: %v", v.Type())} |
| 559 | return |
| 560 | } |
| 561 | class := ClassUniversal |
| 562 | |
| 563 | if params.timeType != 0 && tag != TagUTCTime { |
| 564 | return StructuralError{"explicit time type given to non-time member"} |
| 565 | } |
| 566 | |
| 567 | // jtasn1 updated to allow slices of strings |
| 568 | if params.stringType != 0 && !(tag == TagPrintableString || (v.Kind() == reflect.Slice && tag == 16 && v.Type().Elem().Kind() == reflect.String)) { |
| 569 | return StructuralError{"explicit string type given to non-string member"} |
| 570 | } |
| 571 | |
| 572 | switch tag { |
| 573 | case TagPrintableString: |
| 574 | if params.stringType == 0 { |
| 575 | // This is a string without an explicit string type. We'll use |
| 576 | // a PrintableString if the character set in the string is |
| 577 | // sufficiently limited, otherwise we'll use a UTF8String. |
| 578 | for _, r := range v.String() { |
| 579 | if r >= utf8.RuneSelf || !isPrintable(byte(r)) { |
| 580 | if !utf8.ValidString(v.String()) { |
| 581 | return errors.New("asn1: string not valid UTF-8") |
| 582 | } |
| 583 | tag = TagUTF8String |
| 584 | break |
| 585 | } |
| 586 | } |
| 587 | } else { |
| 588 | tag = params.stringType |
| 589 | } |
| 590 | case TagUTCTime: |
| 591 | if params.timeType == TagGeneralizedTime || outsideUTCRange(v.Interface().(time.Time)) { |
| 592 | tag = TagGeneralizedTime |
| 593 | } |
| 594 | } |
| 595 | |
| 596 | if params.set { |
| 597 | if tag != TagSequence { |
| 598 | return StructuralError{"non sequence tagged as set"} |
| 599 | } |
| 600 | tag = TagSet |
| 601 | } |
| 602 | |
| 603 | tags, body := out.fork() |
| 604 | |
| 605 | err = marshalBody(body, v, params) |
| 606 | if err != nil { |
| 607 | return |
| 608 | } |
| 609 | |
| 610 | bodyLen := body.Len() |
| 611 | |
| 612 | var explicitTag *forkableWriter |
| 613 | if params.explicit { |
| 614 | explicitTag, tags = tags.fork() |
| 615 | } |
| 616 | |
| 617 | if !params.explicit && params.tag != nil { |
| 618 | // implicit tag. |
| 619 | tag = *params.tag |
| 620 | class = ClassContextSpecific |
| 621 | } |
| 622 | |
| 623 | err = marshalTagAndLength(tags, tagAndLength{class, tag, bodyLen, isCompound}) |
| 624 | if err != nil { |
| 625 | return |
| 626 | } |
| 627 | |
| 628 | if params.explicit { |
| 629 | err = marshalTagAndLength(explicitTag, tagAndLength{ |
| 630 | class: ClassContextSpecific, |
| 631 | tag: *params.tag, |
| 632 | length: bodyLen + tags.Len(), |
| 633 | isCompound: true, |
| 634 | }) |
| 635 | } |
| 636 | |
| 637 | return err |
| 638 | } |
| 639 | |
| 640 | // Marshal returns the ASN.1 encoding of val. |
| 641 | // |
| 642 | // In addition to the struct tags recognised by Unmarshal, the following can be |
| 643 | // used: |
| 644 | // |
| 645 | // ia5: causes strings to be marshaled as ASN.1, IA5 strings |
| 646 | // omitempty: causes empty slices to be skipped |
| 647 | // printable: causes strings to be marshaled as ASN.1, PrintableString strings. |
| 648 | // utf8: causes strings to be marshaled as ASN.1, UTF8 strings |
| 649 | func Marshal(val interface{}) ([]byte, error) { |
| 650 | var out bytes.Buffer |
| 651 | v := reflect.ValueOf(val) |
| 652 | f := newForkableWriter() |
| 653 | err := marshalField(f, v, fieldParameters{}) |
| 654 | if err != nil { |
| 655 | return nil, err |
| 656 | } |
| 657 | _, err = f.writeTo(&out) |
| 658 | return out.Bytes(), err |
| 659 | } |