/usr/share/gocode/src/github.com/DHowett/go-plist/bplist.go is in golang-github-dhowett-go-plist-dev 0.0~git20160708.0.fec78c8-1.
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 | package plist
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"hash/crc32"
"io"
"math"
"runtime"
"time"
"unicode/utf16"
)
type bplistTrailer struct {
Unused [5]uint8
SortVersion uint8
OffsetIntSize uint8
ObjectRefSize uint8
NumObjects uint64
TopObject uint64
OffsetTableOffset uint64
}
const (
bpTagNull uint8 = 0x00
bpTagBoolFalse = 0x08
bpTagBoolTrue = 0x09
bpTagInteger = 0x10
bpTagReal = 0x20
bpTagDate = 0x30
bpTagData = 0x40
bpTagASCIIString = 0x50
bpTagUTF16String = 0x60
bpTagUID = 0x80
bpTagArray = 0xA0
bpTagDictionary = 0xD0
)
type bplistGenerator struct {
writer *countedWriter
uniqmap map[interface{}]uint64
objmap map[*plistValue]uint64
objtable []*plistValue
nobjects uint64
trailer bplistTrailer
}
func (p *bplistGenerator) flattenPlistValue(pval *plistValue) {
switch pval.kind {
case String, Integer, Real:
if _, ok := p.uniqmap[pval.value]; ok {
return
}
p.uniqmap[pval.value] = p.nobjects
case Date:
k := pval.value.(time.Time).UnixNano()
if _, ok := p.uniqmap[k]; ok {
return
}
p.uniqmap[k] = p.nobjects
case Data:
// Data are uniqued by their checksums.
// The wonderful difference between uint64 (which we use for numbers)
// and uint32 makes this possible.
// Todo: Look at calculating this only once and storing it somewhere;
// crc32 is fairly quick, however.
uniqkey := crc32.ChecksumIEEE(pval.value.([]byte))
if _, ok := p.uniqmap[uniqkey]; ok {
return
}
p.uniqmap[uniqkey] = p.nobjects
}
p.objtable = append(p.objtable, pval)
p.objmap[pval] = p.nobjects
p.nobjects++
switch pval.kind {
case Dictionary:
dict := pval.value.(*dictionary)
dict.populateArrays()
for _, k := range dict.keys {
p.flattenPlistValue(&plistValue{String, k})
}
for _, v := range dict.values {
p.flattenPlistValue(v)
}
case Array:
subvalues := pval.value.([]*plistValue)
for _, v := range subvalues {
p.flattenPlistValue(v)
}
}
}
func (p *bplistGenerator) indexForPlistValue(pval *plistValue) (uint64, bool) {
var v uint64
var ok bool
switch pval.kind {
case String, Integer, Real:
v, ok = p.uniqmap[pval.value]
case Date:
v, ok = p.uniqmap[pval.value.(time.Time).UnixNano()]
case Data:
v, ok = p.uniqmap[crc32.ChecksumIEEE(pval.value.([]byte))]
default:
v, ok = p.objmap[pval]
}
return v, ok
}
func (p *bplistGenerator) generateDocument(rootpval *plistValue) {
p.objtable = make([]*plistValue, 0, 15)
p.uniqmap = make(map[interface{}]uint64)
p.objmap = make(map[*plistValue]uint64)
p.flattenPlistValue(rootpval)
p.trailer.NumObjects = uint64(len(p.objtable))
p.trailer.ObjectRefSize = uint8(minimumSizeForInt(p.trailer.NumObjects))
p.writer.Write([]byte("bplist00"))
offtable := make([]uint64, p.trailer.NumObjects)
for i, pval := range p.objtable {
offtable[i] = uint64(p.writer.BytesWritten())
p.writePlistValue(pval)
}
p.trailer.OffsetIntSize = uint8(minimumSizeForInt(uint64(p.writer.BytesWritten())))
p.trailer.TopObject = p.objmap[rootpval]
p.trailer.OffsetTableOffset = uint64(p.writer.BytesWritten())
for _, offset := range offtable {
p.writeSizedInt(offset, int(p.trailer.OffsetIntSize))
}
binary.Write(p.writer, binary.BigEndian, p.trailer)
}
func (p *bplistGenerator) writePlistValue(pval *plistValue) {
if pval == nil {
return
}
switch pval.kind {
case Dictionary:
p.writeDictionaryTag(pval.value.(*dictionary))
case Array:
p.writeArrayTag(pval.value.([]*plistValue))
case String:
p.writeStringTag(pval.value.(string))
case Integer:
p.writeIntTag(pval.value.(signedInt).value)
case Real:
p.writeRealTag(pval.value.(sizedFloat).value, pval.value.(sizedFloat).bits)
case Boolean:
p.writeBoolTag(pval.value.(bool))
case Data:
p.writeDataTag(pval.value.([]byte))
case Date:
p.writeDateTag(pval.value.(time.Time))
}
}
func minimumSizeForInt(n uint64) int {
switch {
case n <= uint64(0xff):
return 1
case n <= uint64(0xffff):
return 2
case n <= uint64(0xffffffff):
return 4
default:
return 8
}
panic(errors.New("illegal integer size"))
}
func (p *bplistGenerator) writeSizedInt(n uint64, nbytes int) {
var val interface{}
switch nbytes {
case 1:
val = uint8(n)
case 2:
val = uint16(n)
case 4:
val = uint32(n)
case 8:
val = n
default:
panic(errors.New("illegal integer size"))
}
binary.Write(p.writer, binary.BigEndian, val)
}
func (p *bplistGenerator) writeBoolTag(v bool) {
tag := uint8(bpTagBoolFalse)
if v {
tag = bpTagBoolTrue
}
binary.Write(p.writer, binary.BigEndian, tag)
}
func (p *bplistGenerator) writeIntTag(n uint64) {
var tag uint8
var val interface{}
switch {
case n <= uint64(0xff):
val = uint8(n)
tag = bpTagInteger | 0x0
case n <= uint64(0xffff):
val = uint16(n)
tag = bpTagInteger | 0x1
case n <= uint64(0xffffffff):
val = uint32(n)
tag = bpTagInteger | 0x2
default:
val = n
tag = bpTagInteger | 0x3
}
binary.Write(p.writer, binary.BigEndian, tag)
binary.Write(p.writer, binary.BigEndian, val)
}
func (p *bplistGenerator) writeRealTag(n float64, bits int) {
var tag uint8 = bpTagReal | 0x3
var val interface{} = n
if bits == 32 {
val = float32(n)
tag = bpTagReal | 0x2
}
binary.Write(p.writer, binary.BigEndian, tag)
binary.Write(p.writer, binary.BigEndian, val)
}
func (p *bplistGenerator) writeDateTag(t time.Time) {
tag := uint8(bpTagDate) | 0x3
val := float64(t.In(time.UTC).UnixNano()) / float64(time.Second)
val -= 978307200 // Adjust to Apple Epoch
binary.Write(p.writer, binary.BigEndian, tag)
binary.Write(p.writer, binary.BigEndian, val)
}
func (p *bplistGenerator) writeCountedTag(tag uint8, count uint64) {
marker := tag
if count >= 0xF {
marker |= 0xF
} else {
marker |= uint8(count)
}
binary.Write(p.writer, binary.BigEndian, marker)
if count >= 0xF {
p.writeIntTag(count)
}
}
func (p *bplistGenerator) writeDataTag(data []byte) {
p.writeCountedTag(bpTagData, uint64(len(data)))
binary.Write(p.writer, binary.BigEndian, data)
}
func (p *bplistGenerator) writeStringTag(str string) {
for _, r := range str {
if r > 0xFF {
utf16Runes := utf16.Encode([]rune(str))
p.writeCountedTag(bpTagUTF16String, uint64(len(utf16Runes)))
binary.Write(p.writer, binary.BigEndian, utf16Runes)
return
}
}
p.writeCountedTag(bpTagASCIIString, uint64(len(str)))
binary.Write(p.writer, binary.BigEndian, []byte(str))
}
func (p *bplistGenerator) writeDictionaryTag(dict *dictionary) {
p.writeCountedTag(bpTagDictionary, uint64(dict.count))
vals := make([]uint64, dict.count*2)
cnt := dict.count
for i, k := range dict.keys {
keyIdx, ok := p.uniqmap[k]
if !ok {
panic(errors.New("failed to find key " + k + " in object map during serialization"))
}
vals[i] = keyIdx
}
for i, v := range dict.values {
objIdx, ok := p.indexForPlistValue(v)
if !ok {
panic(errors.New("failed to find value in object map during serialization"))
}
vals[i+cnt] = objIdx
}
for _, v := range vals {
p.writeSizedInt(v, int(p.trailer.ObjectRefSize))
}
}
func (p *bplistGenerator) writeArrayTag(arr []*plistValue) {
p.writeCountedTag(bpTagArray, uint64(len(arr)))
for _, v := range arr {
objIdx, ok := p.indexForPlistValue(v)
if !ok {
panic(errors.New("failed to find value in object map during serialization"))
}
p.writeSizedInt(objIdx, int(p.trailer.ObjectRefSize))
}
}
func (p *bplistGenerator) Indent(i string) {
// There's nothing to indent.
}
func newBplistGenerator(w io.Writer) *bplistGenerator {
return &bplistGenerator{
writer: &countedWriter{Writer: mustWriter{w}},
}
}
type bplistParser struct {
reader io.ReadSeeker
version int
buf []byte
objrefs map[uint64]*plistValue
offtable []uint64
trailer bplistTrailer
trailerOffset int64
}
func (p *bplistParser) parseDocument() (pval *plistValue, parseError error) {
defer func() {
if r := recover(); r != nil {
if _, ok := r.(runtime.Error); ok {
panic(r)
}
if _, ok := r.(invalidPlistError); ok {
parseError = r.(error)
} else {
// Wrap all non-invalid-plist errors.
parseError = plistParseError{"binary", r.(error)}
}
}
}()
magic := make([]byte, 6)
ver := make([]byte, 2)
p.reader.Seek(0, 0)
p.reader.Read(magic)
if !bytes.Equal(magic, []byte("bplist")) {
panic(invalidPlistError{"binary", errors.New("mismatched magic")})
}
_, err := p.reader.Read(ver)
if err != nil {
panic(err)
}
p.version = int(mustParseInt(string(ver), 10, 0))
if p.version > 1 {
panic(fmt.Errorf("unexpected version %d", p.version))
}
p.objrefs = make(map[uint64]*plistValue)
p.trailerOffset, err = p.reader.Seek(-32, 2)
if err != nil && err != io.EOF {
panic(err)
}
err = binary.Read(p.reader, binary.BigEndian, &p.trailer)
if err != nil && err != io.EOF {
panic(err)
}
if p.trailer.NumObjects > uint64(math.Pow(2, 8*float64(p.trailer.ObjectRefSize))) {
panic(fmt.Errorf("binary property list contains more objects (%v) than its object ref size (%v bytes) can support", p.trailer.NumObjects, p.trailer.ObjectRefSize))
}
if p.trailer.TopObject >= p.trailer.NumObjects {
panic(fmt.Errorf("top object index %v is out of range (only %v objects exist)", p.trailer.TopObject, p.trailer.NumObjects))
}
p.offtable = make([]uint64, p.trailer.NumObjects)
// SEEK_SET
_, err = p.reader.Seek(int64(p.trailer.OffsetTableOffset), 0)
if err != nil && err != io.EOF {
panic(err)
}
for i := uint64(0); i < p.trailer.NumObjects; i++ {
off := p.readSizedInt(int(p.trailer.OffsetIntSize))
if off >= uint64(p.trailerOffset) {
panic(fmt.Errorf("object %v starts beyond end of plist trailer (%v vs %v)", i, off, p.trailerOffset))
}
p.offtable[i] = off
}
for _, off := range p.offtable {
p.valueAtOffset(off)
}
pval = p.valueAtOffset(p.offtable[p.trailer.TopObject])
return
}
func (p *bplistParser) readSizedInt(nbytes int) uint64 {
switch nbytes {
case 1:
var val uint8
binary.Read(p.reader, binary.BigEndian, &val)
return uint64(val)
case 2:
var val uint16
binary.Read(p.reader, binary.BigEndian, &val)
return uint64(val)
case 4:
var val uint32
binary.Read(p.reader, binary.BigEndian, &val)
return uint64(val)
case 8:
var val uint64
binary.Read(p.reader, binary.BigEndian, &val)
return uint64(val)
case 16:
var high, low uint64
binary.Read(p.reader, binary.BigEndian, &high)
binary.Read(p.reader, binary.BigEndian, &low)
// TODO: int128 support (!)
return uint64(low)
}
panic(errors.New("illegal integer size"))
}
func (p *bplistParser) countForTag(tag uint8) uint64 {
cnt := uint64(tag & 0x0F)
if cnt == 0xF {
var intTag uint8
binary.Read(p.reader, binary.BigEndian, &intTag)
cnt = p.readSizedInt(1 << (intTag & 0xF))
}
return cnt
}
func (p *bplistParser) valueAtOffset(off uint64) *plistValue {
if pval, ok := p.objrefs[off]; ok {
return pval
}
pval := p.parseTagAtOffset(int64(off))
p.objrefs[off] = pval
return pval
}
func (p *bplistParser) parseTagAtOffset(off int64) *plistValue {
var tag uint8
_, err := p.reader.Seek(off, 0)
if err != nil {
panic(err)
}
err = binary.Read(p.reader, binary.BigEndian, &tag)
if err != nil {
panic(err)
}
switch tag & 0xF0 {
case bpTagNull:
switch tag & 0x0F {
case bpTagBoolTrue, bpTagBoolFalse:
return &plistValue{Boolean, tag == bpTagBoolTrue}
}
return nil
case bpTagInteger:
val := p.readSizedInt(1 << (tag & 0xF))
return &plistValue{Integer, signedInt{val, false}}
case bpTagReal:
nbytes := 1 << (tag & 0x0F)
switch nbytes {
case 4:
var val float32
binary.Read(p.reader, binary.BigEndian, &val)
return &plistValue{Real, sizedFloat{float64(val), 32}}
case 8:
var val float64
binary.Read(p.reader, binary.BigEndian, &val)
return &plistValue{Real, sizedFloat{float64(val), 64}}
}
panic(errors.New("illegal float size"))
case bpTagDate:
var val float64
binary.Read(p.reader, binary.BigEndian, &val)
// Apple Epoch is 20110101000000Z
// Adjust for UNIX Time
val += 978307200
sec, fsec := math.Modf(val)
time := time.Unix(int64(sec), int64(fsec*float64(time.Second))).In(time.UTC)
return &plistValue{Date, time}
case bpTagData:
cnt := p.countForTag(tag)
if int64(cnt) > p.trailerOffset-int64(off) {
panic(fmt.Errorf("data at %x longer than file (%v bytes, max is %v)", off, cnt, p.trailerOffset-int64(off)))
}
bytes := make([]byte, cnt)
binary.Read(p.reader, binary.BigEndian, bytes)
return &plistValue{Data, bytes}
case bpTagASCIIString, bpTagUTF16String:
cnt := p.countForTag(tag)
if int64(cnt) > p.trailerOffset-int64(off) {
panic(fmt.Errorf("string at %x longer than file (%v bytes, max is %v)", off, cnt, p.trailerOffset-int64(off)))
}
if tag&0xF0 == bpTagASCIIString {
bytes := make([]byte, cnt)
binary.Read(p.reader, binary.BigEndian, bytes)
return &plistValue{String, string(bytes)}
} else {
bytes := make([]uint16, cnt)
binary.Read(p.reader, binary.BigEndian, bytes)
runes := utf16.Decode(bytes)
return &plistValue{String, string(runes)}
}
case bpTagUID: // Somehow different than int: low half is nbytes - 1 instead of log2(nbytes)
val := p.readSizedInt(int(tag&0xF) + 1)
return &plistValue{Integer, signedInt{val, false}}
case bpTagDictionary:
cnt := p.countForTag(tag)
subvalues := make(map[string]*plistValue)
indices := make([]uint64, cnt*2)
for i := uint64(0); i < cnt*2; i++ {
idx := p.readSizedInt(int(p.trailer.ObjectRefSize))
if idx >= p.trailer.NumObjects {
panic(fmt.Errorf("dictionary contains invalid entry index %d (max %d)", idx, p.trailer.NumObjects))
}
indices[i] = idx
}
for i := uint64(0); i < cnt; i++ {
keyOffset := p.offtable[indices[i]]
valueOffset := p.offtable[indices[i+cnt]]
if keyOffset == uint64(off) {
panic(fmt.Errorf("dictionary contains self-referential key %x (index %d)", off, i))
}
if valueOffset == uint64(off) {
panic(fmt.Errorf("dictionary contains self-referential value %x (index %d)", off, i))
}
kval := p.valueAtOffset(keyOffset)
if kval == nil || kval.kind != String {
panic(fmt.Errorf("dictionary contains non-string key at index %d", i))
}
key, ok := kval.value.(string)
if !ok {
panic(fmt.Errorf("string-type plist value contains non-string at index %d", i))
}
subvalues[key] = p.valueAtOffset(valueOffset)
}
return &plistValue{Dictionary, &dictionary{m: subvalues}}
case bpTagArray:
cnt := p.countForTag(tag)
arr := make([]*plistValue, cnt)
indices := make([]uint64, cnt)
for i := uint64(0); i < cnt; i++ {
idx := p.readSizedInt(int(p.trailer.ObjectRefSize))
if idx >= p.trailer.NumObjects {
panic(fmt.Errorf("array contains invalid entry index %d (max %d)", idx, p.trailer.NumObjects))
}
indices[i] = idx
}
for i := uint64(0); i < cnt; i++ {
valueOffset := p.offtable[indices[i]]
if valueOffset == uint64(off) {
panic(fmt.Errorf("array contains self-referential value %x (index %d)", off, i))
}
arr[i] = p.valueAtOffset(valueOffset)
}
return &plistValue{Array, arr}
}
panic(fmt.Errorf("unexpected atom 0x%2.02x at offset %d", tag, off))
}
func newBplistParser(r io.ReadSeeker) *bplistParser {
return &bplistParser{reader: r}
}
|