├── LICENSE.txt ├── README.txt ├── gpt.go ├── gpt_data_test.go └── gpt_test.go /LICENSE.txt: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2015 Timofey Koolin, Rekby. 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. -------------------------------------------------------------------------------- /README.txt: -------------------------------------------------------------------------------- 1 | Library for direct work with GPT table. 2 | 3 | Documentation: 4 | https://godoc.org/github.com/rekby/gpt -------------------------------------------------------------------------------- /gpt.go: -------------------------------------------------------------------------------- 1 | package gpt 2 | 3 | import ( 4 | "bytes" 5 | "crypto/rand" 6 | "encoding/binary" 7 | "fmt" 8 | "hash/crc32" 9 | "io" 10 | "unicode/utf16" 11 | ) 12 | 13 | const standardHeaderSize = 92 // Size of standard GPT-header in bytes 14 | const standardPartitionEntrySize = 128 // Size of standard GPT-partition entry in bytes 15 | 16 | type Flags [8]byte 17 | type Guid [16]byte 18 | 19 | func (this Guid) String() string { 20 | return guidToString(this) 21 | } 22 | 23 | type PartType Guid 24 | 25 | func (this PartType) String() string { 26 | return guidToString(this) 27 | } 28 | 29 | var ( 30 | GUID_LVM = PartType([16]byte{0x79, 0xd3, 0xd6, 0xe6, 0x7, 0xf5, 0xc2, 0x44, 0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28}) // E6D6D379-F507-44C2-A23C-238F2A3DF928 31 | ) 32 | 33 | // https://en.wikipedia.org/wiki/GUID_Partition_Table#Partition_table_header_.28LBA_1.29 34 | type Header struct { 35 | Signature [8]byte // Offset 0. "EFI PART", 45h 46h 49h 20h 50h 41h 52h 54h 36 | Revision uint32 // Offset 8 37 | Size uint32 // Offset 12 38 | CRC uint32 // Offset 16. Autocalc when save Header. 39 | Reserved uint32 // Offset 20 40 | HeaderStartLBA uint64 // Offset 24 41 | HeaderCopyStartLBA uint64 // Offset 32 42 | FirstUsableLBA uint64 // Offset 40 43 | LastUsableLBA uint64 // Offset 48 44 | DiskGUID Guid // Offset 56 45 | PartitionsTableStartLBA uint64 // Offset 72 46 | PartitionsArrLen uint32 // Offset 80 47 | PartitionEntrySize uint32 // Offset 84 48 | PartitionsCRC uint32 // Offset 88. Autocalc when save Table. 49 | TrailingBytes []byte // Offset 92 50 | } 51 | 52 | // https://en.wikipedia.org/wiki/GUID_Partition_Table#Partition_entries 53 | type Partition struct { 54 | Type PartType // Offset 0 55 | Id Guid // Offset 16 56 | FirstLBA uint64 // Offset 32 57 | LastLBA uint64 // Offset 40 58 | Flags Flags // Offset 68 59 | PartNameUTF16 [72]byte // Offset 56 60 | TrailingBytes []byte // Offset 128. Usually it is empty 61 | } 62 | 63 | type Table struct { 64 | SectorSize uint64 // in bytes 65 | Header Header 66 | Partitions []Partition 67 | } 68 | 69 | ////////////////////////////////////////////// 70 | ////////////////// HEADER //////////////////// 71 | ////////////////////////////////////////////// 72 | 73 | // Have to set to start of Header. Usually LBA1 for primary header. 74 | func readHeader(reader io.Reader, sectorSize uint64) (res Header, err error) { 75 | read := func(data interface{}) { 76 | if err == nil { 77 | err = binary.Read(reader, binary.LittleEndian, data) 78 | } 79 | } 80 | 81 | read(&res.Signature) 82 | read(&res.Revision) 83 | read(&res.Size) 84 | read(&res.CRC) 85 | read(&res.Reserved) 86 | read(&res.HeaderStartLBA) 87 | read(&res.HeaderCopyStartLBA) 88 | read(&res.FirstUsableLBA) 89 | read(&res.LastUsableLBA) 90 | read(&res.DiskGUID) 91 | read(&res.PartitionsTableStartLBA) 92 | read(&res.PartitionsArrLen) 93 | read(&res.PartitionEntrySize) 94 | read(&res.PartitionsCRC) 95 | if err != nil { 96 | return 97 | } 98 | 99 | if string(res.Signature[:]) != "EFI PART" { 100 | return res, fmt.Errorf("Bad GPT signature") 101 | } 102 | trailingBytes := make([]byte, sectorSize-uint64(standardHeaderSize)) 103 | reader.Read(trailingBytes) 104 | res.TrailingBytes = trailingBytes 105 | 106 | if res.calcCRC() != res.CRC { 107 | return res, fmt.Errorf("BAD GPT Header CRC") 108 | } 109 | 110 | return 111 | } 112 | 113 | func (this *Header) calcCRC() uint32 { 114 | buf := &bytes.Buffer{} 115 | this.write(buf, false) 116 | return crc32.ChecksumIEEE(buf.Bytes()[:this.Size]) 117 | } 118 | 119 | func (this *Header) write(writer io.Writer, saveCRC bool) (err error) { 120 | write := func(data interface{}) { 121 | if err == nil { 122 | err = binary.Write(writer, binary.LittleEndian, data) 123 | } 124 | } 125 | 126 | write(&this.Signature) 127 | write(&this.Revision) 128 | write(&this.Size) 129 | 130 | if saveCRC { 131 | this.CRC = this.calcCRC() 132 | write(&this.CRC) 133 | } else { 134 | write(uint32(0)) 135 | } 136 | 137 | write(&this.Reserved) 138 | write(&this.HeaderStartLBA) 139 | write(&this.HeaderCopyStartLBA) 140 | write(&this.FirstUsableLBA) 141 | write(&this.LastUsableLBA) 142 | write(&this.DiskGUID) 143 | write(&this.PartitionsTableStartLBA) 144 | write(&this.PartitionsArrLen) 145 | write(&this.PartitionEntrySize) 146 | write(&this.PartitionsCRC) 147 | if err != nil { 148 | return 149 | } 150 | write(this.TrailingBytes) 151 | return 152 | } 153 | 154 | ////////////////////////////////////////////// 155 | ///////////////// PARTITION ////////////////// 156 | ////////////////////////////////////////////// 157 | func readPartition(reader io.Reader, size uint32) (p Partition, err error) { 158 | read := func(data interface{}) { 159 | if err == nil { 160 | err = binary.Read(reader, binary.LittleEndian, data) 161 | } 162 | } 163 | 164 | p.TrailingBytes = make([]byte, size-standardPartitionEntrySize) 165 | 166 | read(&p.Type) 167 | read(&p.Id) 168 | read(&p.FirstLBA) 169 | read(&p.LastLBA) 170 | read(&p.Flags) 171 | read(&p.PartNameUTF16) 172 | read(&p.TrailingBytes) 173 | 174 | return 175 | } 176 | 177 | func (this Partition) write(writer io.Writer, size uint32) (err error) { 178 | write := func(data interface{}) { 179 | if err == nil { 180 | err = binary.Write(writer, binary.LittleEndian, data) 181 | } 182 | } 183 | 184 | if size != uint32(standardPartitionEntrySize+len(this.TrailingBytes)) { 185 | return fmt.Errorf("Entry size(%v) != real entry size(%v)", size, standardPartitionEntrySize+len(this.TrailingBytes)) 186 | } 187 | 188 | write(this.Type) 189 | write(this.Id) 190 | write(this.FirstLBA) 191 | write(this.LastLBA) 192 | write(this.Flags) 193 | write(this.PartNameUTF16) 194 | write(this.TrailingBytes) 195 | 196 | return 197 | } 198 | 199 | func (this Partition) IsEmpty() bool { 200 | return this.Type == [16]byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} 201 | } 202 | 203 | func (this Partition) Name() string { 204 | chars := make([]uint16, 0, 36) 205 | for i := 0; i < len(this.PartNameUTF16); i += 2 { 206 | byte1 := this.PartNameUTF16[i] 207 | byte2 := this.PartNameUTF16[i+1] 208 | if byte1 == 0 && byte2 == 0 { 209 | break 210 | } 211 | chars = append(chars, uint16(byte1)+uint16(byte2)<<8) 212 | } 213 | runes := utf16.Decode(chars) 214 | return string(runes) 215 | } 216 | 217 | ////////////////////////////////////////////// 218 | ////////////////// TABLE ///////////////////// 219 | ////////////////////////////////////////////// 220 | 221 | // Read GPT partition 222 | // Have to set to first byte of GPT Header (usually start of second sector on disk) 223 | func ReadTable(reader io.ReadSeeker, SectorSize uint64) (table Table, err error) { 224 | table.SectorSize = SectorSize 225 | table.Header, err = readHeader(reader, SectorSize) 226 | if err != nil { 227 | return 228 | } 229 | if seekDest, ok := mul(int64(SectorSize), int64(table.Header.PartitionsTableStartLBA)); ok { 230 | reader.Seek(seekDest, 0) 231 | } else { 232 | err = fmt.Errorf("Seek overflow when read partition tables") 233 | return 234 | } 235 | for i := uint32(0); i < table.Header.PartitionsArrLen; i++ { 236 | var p Partition 237 | p, err = readPartition(reader, table.Header.PartitionEntrySize) 238 | if err != nil { 239 | return 240 | } 241 | table.Partitions = append(table.Partitions, p) 242 | } 243 | 244 | if table.Header.PartitionsCRC != table.calcPartitionsCRC() { 245 | err = fmt.Errorf("Bad partitions crc") 246 | return 247 | } 248 | return 249 | } 250 | 251 | func (this Table) CreateOtherSideTable() (res Table) { 252 | res = this.copy() 253 | 254 | // Copy of table on other side of disk 255 | tmpDest := res.Header.HeaderStartLBA 256 | res.Header.HeaderStartLBA = res.Header.HeaderCopyStartLBA 257 | res.Header.HeaderCopyStartLBA = tmpDest 258 | 259 | if res.Header.HeaderStartLBA == 1 { 260 | res.Header.PartitionsTableStartLBA = 2 261 | } else { 262 | // Partitions table on other side of disk 263 | res.Header.PartitionsTableStartLBA = res.Header.LastUsableLBA + 1 264 | } 265 | 266 | res.Header.CRC = res.Header.calcCRC() 267 | return res 268 | } 269 | 270 | // Create primary table for resized disk 271 | // size - in sectors 272 | func (this Table) CreateTableForNewDiskSize(size uint64) (res Table) { 273 | res = this.copy() 274 | 275 | // Always create primary table 276 | res.Header.HeaderStartLBA = 1 277 | res.Header.PartitionsTableStartLBA = 2 278 | res.Header.HeaderCopyStartLBA = size - 1 // Last sector 279 | 280 | partitionsTableSize := uint64(res.Header.PartitionEntrySize) * uint64(res.Header.PartitionsArrLen) 281 | partitionSizeInSector := partitionsTableSize / uint64(res.SectorSize) 282 | if partitionsTableSize%uint64(res.SectorSize) != 0 { 283 | partitionSizeInSector++ 284 | } 285 | res.Header.LastUsableLBA = size - 1 - partitionSizeInSector - 1 // header in last sector and partitions table 286 | 287 | res.Header.CRC = res.Header.calcCRC() 288 | return res 289 | } 290 | 291 | func (this Table) copy() (res Table) { 292 | res = this 293 | 294 | res.Header.TrailingBytes = make([]byte, len(this.Header.TrailingBytes)) 295 | copy(res.Header.TrailingBytes, this.Header.TrailingBytes) 296 | 297 | res.Partitions = make([]Partition, len(this.Partitions)) 298 | copy(res.Partitions, this.Partitions) 299 | for i := range this.Partitions { 300 | res.Partitions[i].TrailingBytes = make([]byte, len(this.Partitions[i].TrailingBytes)) 301 | copy(res.Partitions[i].TrailingBytes, this.Partitions[i].TrailingBytes) 302 | } 303 | 304 | return res 305 | } 306 | 307 | func (this Table) calcPartitionsCRC() uint32 { 308 | buf := &bytes.Buffer{} 309 | for _, part := range this.Partitions { 310 | part.write(buf, this.Header.PartitionEntrySize) 311 | } 312 | return crc32.ChecksumIEEE(buf.Bytes()) 313 | } 314 | 315 | // Calc header and partitions CRC. Save Header and partition entries to the disk. 316 | // It independent of start position: writer will be seek to position from Table.Header. 317 | func (this Table) Write(writer io.WriteSeeker) (err error) { 318 | this.Header.PartitionsCRC = this.calcPartitionsCRC() 319 | if headerPos, ok := mul(int64(this.SectorSize), int64(this.Header.HeaderStartLBA)); ok { 320 | writer.Seek(headerPos, 0) 321 | } 322 | err = this.Header.write(writer, true) 323 | if err != nil { 324 | return 325 | } 326 | if partTablePos, ok := mul(int64(this.SectorSize), int64(this.Header.PartitionsTableStartLBA)); ok { 327 | writer.Seek(partTablePos, 0) 328 | } 329 | for _, part := range this.Partitions { 330 | err = part.write(writer, this.Header.PartitionEntrySize) 331 | if err != nil { 332 | return 333 | } 334 | } 335 | return 336 | } 337 | 338 | // Use for create guid predefined values in snippet http://play.golang.org/p/uOd_WQtiwE 339 | func StringToGuid(guid string) (res [16]byte, err error) { 340 | byteOrder := [...]int{3, 2, 1, 0, -1, 5, 4, -1, 7, 6, -1, 8, 9, -1, 10, 11, 12, 13, 14, 15} 341 | if len(guid) != 36 { 342 | err = fmt.Errorf("BAD guid string length.") 343 | return 344 | } 345 | guidByteNum := 0 346 | for i := 0; i < len(guid); i += 2 { 347 | if byteOrder[guidByteNum] == -1 { 348 | if guid[i] == '-' { 349 | i++ 350 | guidByteNum++ 351 | if i >= len(guid)+1 { 352 | err = fmt.Errorf("BAD guid format minus") 353 | return 354 | } 355 | } else { 356 | err = fmt.Errorf("BAD guid char in minus pos") 357 | return 358 | } 359 | } 360 | 361 | sub := guid[i : i+2] 362 | var bt byte 363 | for pos, ch := range sub { 364 | var shift uint 365 | if pos == 0 { 366 | shift = 4 367 | } else { 368 | shift = 0 369 | } 370 | switch ch { 371 | case '0': 372 | bt |= 0 << shift 373 | case '1': 374 | bt |= 1 << shift 375 | case '2': 376 | bt |= 2 << shift 377 | case '3': 378 | bt |= 3 << shift 379 | case '4': 380 | bt |= 4 << shift 381 | case '5': 382 | bt |= 5 << shift 383 | case '6': 384 | bt |= 6 << shift 385 | case '7': 386 | bt |= 7 << shift 387 | case '8': 388 | bt |= 8 << shift 389 | case '9': 390 | bt |= 9 << shift 391 | case 'A', 'a': 392 | bt |= 10 << shift 393 | case 'B', 'b': 394 | bt |= 11 << shift 395 | case 'C', 'c': 396 | bt |= 12 << shift 397 | case 'D', 'd': 398 | bt |= 13 << shift 399 | case 'E', 'e': 400 | bt |= 14 << shift 401 | case 'F', 'f': 402 | bt |= 15 << shift 403 | default: 404 | err = fmt.Errorf("BAD guid char at pos %d: '%c'", i+pos, ch) 405 | return 406 | } 407 | } 408 | res[byteOrder[guidByteNum]] = bt 409 | guidByteNum++ 410 | } 411 | return res, nil 412 | } 413 | 414 | // NewTableArgs - arguments NewTable creation. 415 | type NewTableArgs struct { 416 | SectorSize uint64 417 | DiskGuid Guid 418 | } 419 | 420 | // NewTable - return a valid empty Table for given sectorSize and diskSize 421 | // Note that a Protective MBR is needed for lots of software to read the GPT table. 422 | func NewTable(diskSize uint64, args *NewTableArgs) Table { 423 | // CreateTableForNewdiskSize will update HeaderCopyStartLBA, LastUsableLBA, and CRC 424 | if args == nil { 425 | args = &NewTableArgs{} 426 | } 427 | if args.SectorSize == 0 { 428 | args.SectorSize = uint64(512) 429 | } 430 | var emptyGuid Guid 431 | if args.DiskGuid == emptyGuid { 432 | args.DiskGuid = NewGUID() 433 | } 434 | 435 | ptStartLBA := uint64(2) 436 | numParts := 128 437 | partitionsTableSize := uint64(standardPartitionEntrySize) * uint64(numParts) 438 | partitionSizeInSector := partitionsTableSize / uint64(args.SectorSize) 439 | if partitionsTableSize%uint64(args.SectorSize) != 0 { 440 | partitionSizeInSector++ 441 | } 442 | 443 | return Table{ 444 | SectorSize: args.SectorSize, 445 | Header: Header{ 446 | Signature: [8]byte{0x45, 0x46, 0x49, 0x20, 0x50, 0x41, 0x52, 0x54}, 447 | Revision: 0x10000, 448 | Size: standardHeaderSize, 449 | CRC: 0, 450 | Reserved: 0, 451 | HeaderStartLBA: 1, 452 | HeaderCopyStartLBA: 0, 453 | FirstUsableLBA: ptStartLBA + partitionSizeInSector, 454 | LastUsableLBA: 0, 455 | DiskGUID: args.DiskGuid, 456 | PartitionsTableStartLBA: ptStartLBA, 457 | PartitionsArrLen: uint32(numParts), 458 | PartitionEntrySize: uint32(standardPartitionEntrySize), 459 | PartitionsCRC: 0x0, 460 | TrailingBytes: make([]byte, args.SectorSize-uint64(standardHeaderSize)), 461 | }, 462 | Partitions: make([]Partition, numParts), 463 | }.CreateTableForNewDiskSize(diskSize / args.SectorSize) 464 | } 465 | 466 | ////////////////////////////////////////////// 467 | //////////////// INTERNALS /////////////////// 468 | ////////////////////////////////////////////// 469 | 470 | // Multiply two int64 numbers with overflow check 471 | // Algorithm from https://gist.github.com/areed/85d3614a58400e417027 472 | func mul(a, b int64) (res int64, ok bool) { 473 | const mostPositive = 1<<63 - 1 474 | const mostNegative = -(mostPositive + 1) 475 | 476 | if a == 0 || b == 0 || a == 1 || b == 1 { 477 | return a * b, true 478 | } 479 | if a == mostNegative || b == mostNegative { 480 | return a * b, false 481 | } 482 | c := a * b 483 | return c, c/b == a 484 | } 485 | 486 | func guidToString(byteGuid [16]byte) string { 487 | byteToChars := func(b byte) (res []byte) { 488 | res = make([]byte, 0, 2) 489 | for i := 1; i >= 0; i-- { 490 | switch b >> uint(4*i) & 0x0F { 491 | case 0: 492 | res = append(res, '0') 493 | case 1: 494 | res = append(res, '1') 495 | case 2: 496 | res = append(res, '2') 497 | case 3: 498 | res = append(res, '3') 499 | case 4: 500 | res = append(res, '4') 501 | case 5: 502 | res = append(res, '5') 503 | case 6: 504 | res = append(res, '6') 505 | case 7: 506 | res = append(res, '7') 507 | case 8: 508 | res = append(res, '8') 509 | case 9: 510 | res = append(res, '9') 511 | case 10: 512 | res = append(res, 'A') 513 | case 11: 514 | res = append(res, 'B') 515 | case 12: 516 | res = append(res, 'C') 517 | case 13: 518 | res = append(res, 'D') 519 | case 14: 520 | res = append(res, 'E') 521 | case 15: 522 | res = append(res, 'F') 523 | } 524 | } 525 | return 526 | } 527 | s := make([]byte, 0, 36) 528 | byteOrder := [...]int{3, 2, 1, 0, -1, 5, 4, -1, 7, 6, -1, 8, 9, -1, 10, 11, 12, 13, 14, 15} 529 | for _, i := range byteOrder { 530 | if i == -1 { 531 | s = append(s, '-') 532 | } else { 533 | s = append(s, byteToChars(byteGuid[i])...) 534 | } 535 | } 536 | return string(s) 537 | } 538 | 539 | func NewGUID() Guid { 540 | var res Guid 541 | _, err := rand.Read(res[:]) 542 | if err != nil { 543 | panic(err) 544 | } 545 | 546 | // set predefined bits for UUIDv4 547 | res[6] = (res[6] & 0x0f) | 0x40 // Version 4 548 | res[8] = (res[8] & 0x3f) | 0x80 // Variant 10 549 | return res 550 | } 551 | -------------------------------------------------------------------------------- /gpt_data_test.go: -------------------------------------------------------------------------------- 1 | package gpt 2 | 3 | var GPT_TEST_HEADER = []byte{69, 70, 73, 32, 80, 65, 82, 84, 0, 0, 1, 0, 92, 0, 0, 0, 145, 176, 29, 206, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 175, 109, 112, 116, 0, 0, 0, 0, 34, 0, 0, 0, 0, 0, 0, 0, 142, 109, 112, 116, 0, 0, 0, 0, 190, 139, 78, 124, 58, 164, 159, 72, 142, 28, 5, 196, 90, 42, 168, 188, 2, 0, 0, 0, 0, 0, 0, 0, 128, 0, 0, 0, 128, 0, 0, 0, 197, 95, 126, 73, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} 4 | var GPT_TEST_ENTRIES = []byte{40, 115, 42, 193, 31, 248, 210, 17, 186, 75, 0, 160, 201, 62, 201, 59, 176, 80, 47, 220, 222, 152, 129, 70, 168, 104, 66, 233, 254, 189, 110, 62, 0, 8, 0, 0, 0, 0, 0, 0, 255, 231, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 175, 61, 198, 15, 131, 132, 114, 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-------------------------------------------------------------------------------- /gpt_test.go: -------------------------------------------------------------------------------- 1 | package gpt 2 | 3 | import ( 4 | "bytes" 5 | "testing" 6 | ) 7 | 8 | type randomWriteBuffer struct { 9 | buf []byte 10 | offset int 11 | } 12 | 13 | func (this *randomWriteBuffer) Seek(offset int64, whence int) (newOffset int64, err error) { 14 | switch whence { 15 | case 0: 16 | this.offset = int(offset) 17 | case 1: 18 | this.offset += int(offset) 19 | case 2: 20 | this.offset = len(this.buf) + int(offset) 21 | default: 22 | panic("Error whence") 23 | } 24 | 25 | if this.offset >= len(this.buf) { 26 | newBuf := make([]byte, this.offset) 27 | copy(newBuf, this.buf) 28 | this.buf = newBuf 29 | } 30 | return int64(this.offset), nil 31 | } 32 | 33 | func (this *randomWriteBuffer) Write(p []byte) (n int, err error) { 34 | needLen := this.offset + len(p) 35 | if needLen > len(this.buf) { 36 | newBuf := make([]byte, needLen) 37 | copy(newBuf, this.buf) 38 | this.buf = newBuf 39 | } 40 | copy(this.buf[this.offset:], p) 41 | this.offset += len(p) 42 | return len(p), nil 43 | } 44 | 45 | func TestHeaderRead(t *testing.T) { 46 | reader := bytes.NewReader(GPT_TEST_HEADER) 47 | h, err := readHeader(reader, 512) 48 | if err != nil { 49 | t.Errorf(err.Error()) 50 | } 51 | if string(h.Signature[:]) != "EFI PART" { 52 | t.Error("Signature: ", string(h.Signature[:])) 53 | } 54 | if h.Revision != 0x00010000 { // v1.00 in hex 55 | t.Error("Revision: ", h.Revision) 56 | } 57 | if h.Size != 92 { 58 | t.Error("Header size: ", h.Size) 59 | } 60 | if h.CRC != h.calcCRC() { 61 | t.Error("CRC") 62 | } 63 | if h.Reserved != 0 { 64 | t.Error("Reserved") 65 | } 66 | if h.HeaderStartLBA != 1 { 67 | t.Error("CurrentLBA", h.HeaderStartLBA) 68 | } 69 | if h.HeaderCopyStartLBA != 1953525167 { 70 | t.Error("Other LBA", h.HeaderCopyStartLBA) 71 | } 72 | if h.FirstUsableLBA != 34 { 73 | t.Error("FirstUsable: ", h.FirstUsableLBA) 74 | } 75 | if h.LastUsableLBA != 1953525134 { 76 | t.Error("LastUsable: ", h.LastUsableLBA) 77 | } 78 | if !bytes.Equal(h.DiskGUID[:], []byte{190, 139, 78, 124, 58, 164, 159, 72, 142, 28, 5, 196, 90, 42, 168, 188}) { 79 | t.Error("Disk GUID: ", h.DiskGUID) 80 | } 81 | if h.PartitionsTableStartLBA != 2 { 82 | t.Error("Start partition entries: ", h.PartitionsTableStartLBA) 83 | } 84 | if h.PartitionsArrLen != 128 { 85 | t.Error("Partition arr len", h.PartitionsArrLen) 86 | } 87 | if h.PartitionEntrySize != 128 { 88 | t.Error("Partition entry size:", h.PartitionEntrySize) 89 | } 90 | if h.PartitionsCRC != 1233018821 { 91 | t.Error("Partitions CRC", h.PartitionsCRC) 92 | } 93 | if !bytes.Equal(h.TrailingBytes, make([]byte, 420)) { 94 | t.Error("Trailing bytes: ", h.TrailingBytes) 95 | } 96 | } 97 | 98 | func TestHeaderReadWrite(t *testing.T) { 99 | reader := bytes.NewReader(GPT_TEST_HEADER) 100 | h, err := readHeader(reader, 512) 101 | if err != nil { 102 | t.Errorf(err.Error()) 103 | } 104 | writer := &bytes.Buffer{} 105 | h.write(writer, true) 106 | 107 | if !bytes.Equal(GPT_TEST_HEADER, writer.Bytes()) { 108 | t.Error("Read and write not equal") 109 | } 110 | } 111 | 112 | func TestEntryReadWrite(t *testing.T) { 113 | testEntry := make([]byte, 137) 114 | copy(testEntry, GPT_TEST_ENTRIES[0:128]) 115 | testEntry[128] = 1 116 | testEntry[129] = 231 117 | testEntry[130] = 144 118 | testEntry[131] = 66 119 | testEntry[132] = 123 120 | testEntry[133] = 15 121 | testEntry[134] = 18 122 | testEntry[135] = 26 123 | testEntry[126] = 215 124 | 125 | p, err := readPartition(bytes.NewReader(testEntry), 137) 126 | if err != nil { 127 | t.Error(err) 128 | } 129 | 130 | writeBuf := &bytes.Buffer{} 131 | err = p.write(writeBuf, 137) 132 | if err != nil { 133 | t.Error(err) 134 | } 135 | if !bytes.Equal(testEntry, writeBuf.Bytes()) { 136 | t.Error("Read-write") 137 | } 138 | } 139 | 140 | func TestPartitionRead(t *testing.T) { 141 | p, err := readPartition(bytes.NewReader(GPT_TEST_ENTRIES), 128) 142 | if err != nil { 143 | t.Error(err) 144 | } 145 | 146 | if !bytes.Equal(p.Type[:], []byte{40, 115, 42, 193, 31, 248, 210, 17, 186, 75, 0, 160, 201, 62, 201, 59}) { 147 | // C12A7328-F81F-11D2-BA4B-00A0C93EC93B in little endian: first 3 parts in reverse order 148 | t.Error("Part type: ", p.Type) 149 | } 150 | if !bytes.Equal(p.Id[:], []byte{176, 80, 47, 220, 222, 152, 129, 70, 168, 104, 66, 233, 254, 189, 110, 62}) { 151 | t.Error("Partition GUID: ", p.Id) 152 | } 153 | if p.FirstLBA != 2048 { 154 | t.Error("First LBA: ", p.FirstLBA) 155 | } 156 | if p.LastLBA != 780287 { 157 | t.Error("Last LBA: ", p.LastLBA) 158 | } 159 | if !bytes.Equal(p.Flags[:], make([]byte, 8)) { 160 | t.Error("Flags: ", p.Flags) 161 | } 162 | if !bytes.Equal(p.PartNameUTF16[:], make([]byte, 72)) { 163 | t.Error("Name: ", p.PartNameUTF16) 164 | } 165 | } 166 | 167 | func TestPartitionBadWrite(t *testing.T) { 168 | var p Partition 169 | p.TrailingBytes = []byte{1, 2, 3} 170 | buf := &bytes.Buffer{} 171 | if p.write(buf, 130) == nil || p.write(buf, 132) == nil { 172 | t.Error("Write with bad entry size") 173 | } 174 | if p.write(buf, 131) != nil { 175 | t.Error("Write with ok entry size") 176 | } 177 | } 178 | 179 | func TestReadWriteTable(t *testing.T) { 180 | buf := make([]byte, 512+512+32*512) 181 | copy(buf[512:], GPT_TEST_HEADER) 182 | copy(buf[1024:], GPT_TEST_ENTRIES) 183 | reader := bytes.NewReader(buf) 184 | reader.Seek(512, 0) 185 | table, err := ReadTable(reader, 512) 186 | if err != nil { 187 | t.Error(err) 188 | } 189 | 190 | buf2 := &randomWriteBuffer{} 191 | table.Write(buf2) 192 | if !bytes.Equal(buf, buf2.buf) { 193 | t.Error("Bad read-write") 194 | } 195 | } 196 | 197 | func TestNewTable(t *testing.T) { 198 | guid := Guid{0xc5, 0x7f, 0x7e, 0x46, 0x36, 0x2b, 0x4e, 0x60, 0x9a, 0xa9, 0xa6, 0xe9, 0xdd, 0x85, 0x94, 0xa6} 199 | ssize := 4096 200 | diskSize := uint64(ssize * 1024 * 1024) // round 4TiB 201 | numSectors := diskSize / uint64(ssize) 202 | 203 | // sector size 4096 means header+ptdata fits in 5 sectors (33 for size 512) 204 | headerSizePlusPartData := uint64(5) 205 | expectedLastLBA := uint64(numSectors - headerSizePlusPartData - 1) 206 | 207 | table := NewTable(diskSize, &NewTableArgs{uint64(ssize), guid}) 208 | h := table.Header 209 | if h.DiskGUID != guid { 210 | t.Errorf("found DiskGUID %v != %v", guid, h.DiskGUID) 211 | } 212 | 213 | if len(h.TrailingBytes) != ssize-standardHeaderSize { 214 | t.Errorf("Found TralingBytes len %d expected %d", len(h.TrailingBytes), ssize-standardHeaderSize) 215 | } 216 | 217 | if h.CRC != h.calcCRC() { 218 | t.Error("CRC") 219 | } 220 | if h.Reserved != 0 { 221 | t.Error("Reserved") 222 | } 223 | if h.HeaderStartLBA != 1 { 224 | t.Error("CurrentLBA", h.HeaderStartLBA) 225 | } 226 | if h.HeaderCopyStartLBA != numSectors-1 { 227 | t.Error("Other LBA", h.HeaderCopyStartLBA, numSectors-1) 228 | } 229 | if h.FirstUsableLBA != uint64(headerSizePlusPartData+1) { 230 | t.Error("FirstUsable: ", h.FirstUsableLBA) 231 | } 232 | if h.LastUsableLBA != expectedLastLBA { 233 | t.Errorf("LastUsable: expected %d found %d", expectedLastLBA, h.LastUsableLBA) 234 | } 235 | if h.PartitionsTableStartLBA != 2 { 236 | t.Error("Start partition entries: ", h.PartitionsTableStartLBA) 237 | } 238 | if h.PartitionsArrLen != 128 { 239 | t.Error("Partition arr len", h.PartitionsArrLen) 240 | } 241 | if h.PartitionEntrySize != 128 { 242 | t.Error("Partition entry size:", h.PartitionEntrySize) 243 | } 244 | if h.PartitionsCRC != 0 { 245 | t.Error("Partitions CRC", h.PartitionsCRC) 246 | } 247 | 248 | } 249 | 250 | func TestNewTableNil(t *testing.T) { 251 | emptyGuid := Guid{} 252 | ssize := 512 253 | diskSize := uint64(250000384) // round 512 sectors closest to 250gb 254 | numSectors := diskSize / uint64(ssize) 255 | 256 | // sector size 512 means header+ptdata fits in 33 sectors. 257 | headerSizePlusPartData := uint64(33) 258 | expectedLastLBA := uint64(numSectors - headerSizePlusPartData - 1) 259 | 260 | table := NewTable(diskSize, nil) 261 | 262 | h := table.Header 263 | if h.DiskGUID == emptyGuid { 264 | t.Errorf("DiskGUID did not get generated. still empty") 265 | } 266 | 267 | if len(h.TrailingBytes) != ssize-standardHeaderSize { 268 | t.Errorf("Found TralingBytes len %d expected %d", len(h.TrailingBytes), ssize-standardHeaderSize) 269 | } 270 | 271 | if h.CRC != h.calcCRC() { 272 | t.Error("CRC") 273 | } 274 | if h.Reserved != 0 { 275 | t.Error("Reserved") 276 | } 277 | if h.HeaderStartLBA != 1 { 278 | t.Error("CurrentLBA", h.HeaderStartLBA) 279 | } 280 | if h.HeaderCopyStartLBA != numSectors-1 { 281 | t.Error("Other LBA", h.HeaderCopyStartLBA, numSectors-1) 282 | } 283 | if h.FirstUsableLBA != headerSizePlusPartData+1 { 284 | t.Error("FirstUsable: ", h.FirstUsableLBA) 285 | } 286 | if h.LastUsableLBA != expectedLastLBA { 287 | t.Errorf("LastUsable: expected %d found %d", expectedLastLBA, h.LastUsableLBA) 288 | } 289 | if h.PartitionsTableStartLBA != 2 { 290 | t.Error("Start partition entries: ", h.PartitionsTableStartLBA) 291 | } 292 | if h.PartitionsArrLen != 128 { 293 | t.Error("Partition arr len", h.PartitionsArrLen) 294 | } 295 | if h.PartitionEntrySize != 128 { 296 | t.Error("Partition entry size:", h.PartitionEntrySize) 297 | } 298 | if h.PartitionsCRC != 0 { 299 | t.Error("Partitions CRC", h.PartitionsCRC) 300 | } 301 | } 302 | 303 | func TestTableCreateOtherSide(t *testing.T) { 304 | buf := make([]byte, 512+512+32*512) 305 | copy(buf[512:], GPT_TEST_HEADER) 306 | copy(buf[1024:], GPT_TEST_ENTRIES) 307 | reader := bytes.NewReader(buf) 308 | reader.Seek(512, 0) 309 | t1, err := ReadTable(reader, 512) 310 | if err != nil { 311 | t.Error(err) 312 | } 313 | 314 | t2 := t1.CreateOtherSideTable() 315 | if t2.Header.CRC != t2.Header.calcCRC() { 316 | t.Error("crc") 317 | } 318 | if t2.Header.Signature != t1.Header.Signature { 319 | t.Error("signature") 320 | } 321 | if t2.Header.Revision != t1.Header.Revision { 322 | t.Error("revision") 323 | } 324 | if t2.Header.Size != t1.Header.Size { 325 | t.Error("size") 326 | } 327 | if t2.Header.Reserved != t1.Header.Reserved { 328 | t.Error("reserved") 329 | } 330 | if t2.Header.HeaderStartLBA != t1.Header.HeaderCopyStartLBA { 331 | t.Error("header start") 332 | } 333 | if t2.Header.HeaderCopyStartLBA != t1.Header.HeaderStartLBA { 334 | t.Error("header copy") 335 | } 336 | if t2.Header.FirstUsableLBA != t1.Header.FirstUsableLBA { 337 | t.Error("first usable") 338 | } 339 | if t2.Header.LastUsableLBA != t1.Header.LastUsableLBA { 340 | t.Error("last usable") 341 | } 342 | if t2.Header.DiskGUID != t1.Header.DiskGUID { 343 | t.Error("disk guid") 344 | } 345 | if t2.Header.PartitionsTableStartLBA != t2.Header.LastUsableLBA+1 { 346 | t.Error("partitions table start") 347 | } 348 | if t2.Header.PartitionsArrLen != t1.Header.PartitionsArrLen { 349 | t.Error("partitions table len") 350 | } 351 | if t2.Header.PartitionEntrySize != t1.Header.PartitionEntrySize { 352 | t.Error("partitions entry") 353 | } 354 | if t2.Header.PartitionsCRC != t1.Header.PartitionsCRC { 355 | t.Error("partitions crc") 356 | } 357 | if !bytes.Equal(t2.Header.TrailingBytes, t1.Header.TrailingBytes) { 358 | t.Error("trailing bytes aren't equal") 359 | } 360 | 361 | if len(t1.Partitions) != len(t2.Partitions) { 362 | t.Fatal("partitions len are different") 363 | } 364 | 365 | for i := range t1.Partitions { 366 | l := &t1.Partitions[i] 367 | r := &t2.Partitions[i] 368 | if l.Type != r.Type { 369 | t.Error("part type") 370 | } 371 | if l.Id != r.Id { 372 | t.Error("part id") 373 | } 374 | if l.FirstLBA != r.FirstLBA { 375 | t.Error("part first lba") 376 | } 377 | if l.LastLBA != r.LastLBA { 378 | t.Error("part last lba") 379 | } 380 | if l.Flags != r.Flags { 381 | t.Error("part flags") 382 | } 383 | if l.PartNameUTF16 != r.PartNameUTF16 { 384 | t.Error("part name") 385 | } 386 | 387 | if !bytes.Equal(l.TrailingBytes, r.TrailingBytes) { 388 | t.Error("part trailing are different") 389 | } 390 | } 391 | } 392 | 393 | func TestTableCopy(t *testing.T) { 394 | buf := make([]byte, 512+512+32*512) 395 | copy(buf[512:], GPT_TEST_HEADER) 396 | copy(buf[1024:], GPT_TEST_ENTRIES) 397 | reader := bytes.NewReader(buf) 398 | reader.Seek(512, 0) 399 | t1, err := ReadTable(reader, 512) 400 | if err != nil { 401 | t.Error(err) 402 | } 403 | 404 | t1.Header.TrailingBytes = append(t1.Header.TrailingBytes, 1) 405 | t1.Partitions[0].TrailingBytes = append(t1.Partitions[0].TrailingBytes, 1) 406 | 407 | t2 := t1.copy() 408 | if t2.Header.CRC != t2.Header.calcCRC() { 409 | t.Error("crc") 410 | } 411 | if t2.Header.Signature != t1.Header.Signature { 412 | t.Error("signature") 413 | } 414 | if t2.Header.Revision != t1.Header.Revision { 415 | t.Error("revision") 416 | } 417 | if t2.Header.Size != t1.Header.Size { 418 | t.Error("size") 419 | } 420 | if t2.Header.Reserved != t1.Header.Reserved { 421 | t.Error("reserved") 422 | } 423 | if t2.Header.HeaderStartLBA != t1.Header.HeaderStartLBA { 424 | t.Error("header start") 425 | } 426 | if t2.Header.HeaderCopyStartLBA != t1.Header.HeaderCopyStartLBA { 427 | t.Error("header copy") 428 | } 429 | if t2.Header.FirstUsableLBA != t1.Header.FirstUsableLBA { 430 | t.Error("first usable") 431 | } 432 | if t2.Header.LastUsableLBA != t1.Header.LastUsableLBA { 433 | t.Error("last usable") 434 | } 435 | if t2.Header.DiskGUID != t1.Header.DiskGUID { 436 | t.Error("disk guid") 437 | } 438 | if t2.Header.PartitionsTableStartLBA != t1.Header.PartitionsTableStartLBA { 439 | t.Error("partitions table start") 440 | } 441 | if t2.Header.PartitionsArrLen != t1.Header.PartitionsArrLen { 442 | t.Error("partitions table len") 443 | } 444 | if t2.Header.PartitionEntrySize != t1.Header.PartitionEntrySize { 445 | t.Error("partitions entry") 446 | } 447 | if t2.Header.PartitionsCRC != t1.Header.PartitionsCRC { 448 | t.Error("partitions crc") 449 | } 450 | if !bytes.Equal(t2.Header.TrailingBytes, t1.Header.TrailingBytes) { 451 | t.Error("trailing bytes aren't equal") 452 | } 453 | t1.Header.TrailingBytes[0] += 1 454 | if t1.Header.TrailingBytes[0] == t2.Header.TrailingBytes[0] { 455 | t.Error("same trailing bytes") 456 | } 457 | 458 | if len(t1.Partitions) != len(t2.Partitions) { 459 | t.Fatal("partitions len are different") 460 | } 461 | 462 | for i := range t1.Partitions { 463 | l := &t1.Partitions[i] 464 | r := &t2.Partitions[i] 465 | if l.Type != r.Type { 466 | t.Error("part type") 467 | } 468 | if l.Id != r.Id { 469 | t.Error("part id") 470 | } 471 | if l.FirstLBA != r.FirstLBA { 472 | t.Error("part first lba") 473 | } 474 | if l.LastLBA != r.LastLBA { 475 | t.Error("part last lba") 476 | } 477 | if l.Flags != r.Flags { 478 | t.Error("part flags") 479 | } 480 | if l.PartNameUTF16 != r.PartNameUTF16 { 481 | t.Error("part name") 482 | } 483 | 484 | if !bytes.Equal(l.TrailingBytes, r.TrailingBytes) { 485 | t.Error("part trailing are different") 486 | } 487 | } 488 | t1.Partitions[0].TrailingBytes[0] += 1 489 | if t1.Partitions[0].TrailingBytes[0] == t2.Partitions[0].TrailingBytes[0] { 490 | t.Error("same partitions") 491 | } 492 | } 493 | 494 | func TestTableNewSize(t *testing.T) { 495 | buf := make([]byte, 512+512+32*512) 496 | copy(buf[512:], GPT_TEST_HEADER) 497 | copy(buf[1024:], GPT_TEST_ENTRIES) 498 | reader := bytes.NewReader(buf) 499 | reader.Seek(512, 0) 500 | t1, err := ReadTable(reader, 512) 501 | if err != nil { 502 | t.Error(err) 503 | } 504 | 505 | t1.Header.TrailingBytes = append(t1.Header.TrailingBytes, 1) 506 | t1.Partitions[0].TrailingBytes = append(t1.Partitions[0].TrailingBytes, 1) 507 | 508 | t2 := t1.CreateTableForNewDiskSize(1953525168) // Same size as original disk 509 | if t2.Header.CRC != t2.Header.calcCRC() { 510 | t.Error("crc") 511 | } 512 | if t2.Header.Signature != t1.Header.Signature { 513 | t.Error("signature") 514 | } 515 | if t2.Header.Revision != t1.Header.Revision { 516 | t.Error("revision") 517 | } 518 | if t2.Header.Size != t1.Header.Size { 519 | t.Error("size") 520 | } 521 | if t2.Header.Reserved != t1.Header.Reserved { 522 | t.Error("reserved") 523 | } 524 | if t2.Header.HeaderStartLBA != t1.Header.HeaderStartLBA { 525 | t.Error("header start") 526 | } 527 | if t2.Header.HeaderCopyStartLBA != t1.Header.HeaderCopyStartLBA { 528 | t.Error("header copy") 529 | } 530 | if t2.Header.FirstUsableLBA != t1.Header.FirstUsableLBA { 531 | t.Error("first usable") 532 | } 533 | if t2.Header.LastUsableLBA != t1.Header.LastUsableLBA { 534 | t.Error("last usable") 535 | } 536 | if t2.Header.DiskGUID != t1.Header.DiskGUID { 537 | t.Error("disk guid") 538 | } 539 | if t2.Header.PartitionsTableStartLBA != t2.Header.PartitionsTableStartLBA { 540 | t.Error("partitions table start") 541 | } 542 | if t2.Header.PartitionsArrLen != t1.Header.PartitionsArrLen { 543 | t.Error("partitions table len") 544 | } 545 | if t2.Header.PartitionEntrySize != t1.Header.PartitionEntrySize { 546 | t.Error("partitions entry") 547 | } 548 | if t2.Header.PartitionsCRC != t1.Header.PartitionsCRC { 549 | t.Error("partitions crc") 550 | } 551 | if !bytes.Equal(t2.Header.TrailingBytes, t1.Header.TrailingBytes) { 552 | t.Error("trailing bytes aren't equal") 553 | } 554 | t1.Header.TrailingBytes[0] += 1 555 | if t1.Header.TrailingBytes[0] == t2.Header.TrailingBytes[0] { 556 | t.Error("same trailing bytes") 557 | } 558 | 559 | if len(t1.Partitions) != len(t2.Partitions) { 560 | t.Fatal("partitions len are different") 561 | } 562 | 563 | for i := range t1.Partitions { 564 | l := &t1.Partitions[i] 565 | r := &t2.Partitions[i] 566 | if l.Type != r.Type { 567 | t.Error("part type") 568 | } 569 | if l.Id != r.Id { 570 | t.Error("part id") 571 | } 572 | if l.FirstLBA != r.FirstLBA { 573 | t.Error("part first lba") 574 | } 575 | if l.LastLBA != r.LastLBA { 576 | t.Error("part last lba") 577 | } 578 | if l.Flags != r.Flags { 579 | t.Error("part flags") 580 | } 581 | if l.PartNameUTF16 != r.PartNameUTF16 { 582 | t.Error("part name") 583 | } 584 | 585 | if !bytes.Equal(l.TrailingBytes, r.TrailingBytes) { 586 | t.Error("part trailing are different") 587 | } 588 | } 589 | t1.Partitions[0].TrailingBytes[0] += 1 590 | if t1.Partitions[0].TrailingBytes[0] == t2.Partitions[0].TrailingBytes[0] { 591 | t.Error("same partitions") 592 | } 593 | 594 | // Check about it is cacled state, not copy 595 | t2 = t1.CreateTableForNewDiskSize(100) 596 | if t2.Header.HeaderCopyStartLBA != 99 { 597 | t.Error("t2 calc header copy: ", t2.Header.HeaderCopyStartLBA) 598 | } 599 | if t2.Header.LastUsableLBA != 66 { 600 | t.Error("t2 calc last lba: ", t2.Header.LastUsableLBA) 601 | } 602 | } 603 | 604 | func TestGuidToString(t *testing.T) { 605 | guid := [...]byte{40, 115, 42, 193, 31, 248, 210, 17, 186, 75, 0, 160, 201, 62, 201, 59} 606 | guidS := guidToString(guid) 607 | if guidS != "C12A7328-F81F-11D2-BA4B-00A0C93EC93B" { 608 | t.Errorf("Error guid: %v != %v", guidS, "C12A7328-F81F-11D2-BA4B-00A0C93EC93B") 609 | } 610 | } 611 | 612 | func TestStringToGuid(t *testing.T) { 613 | guid, err := StringToGuid("C12A7328-F81F-11D2-BA4B-00A0C93EC93B") 614 | if err != nil { 615 | t.Error(err) 616 | } 617 | if guid != [...]byte{40, 115, 42, 193, 31, 248, 210, 17, 186, 75, 0, 160, 201, 62, 201, 59} { 618 | t.Errorf("Bad result. Expected:\n%v\nResult:\n%v", [...]byte{40, 115, 42, 193, 31, 248, 210, 17, 186, 75, 0, 160, 201, 62, 201, 59}, guid) 619 | } 620 | if _, err := StringToGuid(""); err == nil { 621 | t.Error("Must return error") 622 | } 623 | if _, err := StringToGuid("C12A7328-F81F-11D2-BA4B-00A0C93EC93BA"); err == nil { 624 | t.Error("Must return error") 625 | } 626 | if _, err := StringToGuid("C12A7328-F81F-11D2-BA4B!00A0C93EC93B"); err == nil { 627 | t.Error("Must return error") 628 | } 629 | if _, err := StringToGuid("C12A7328-F81F-11D2-BA4B-00A0C93EC93Z"); err == nil { 630 | t.Error("Must return error") 631 | } 632 | } 633 | --------------------------------------------------------------------------------