kesavand | 2cde658 | 2020-06-22 04:56:23 -0400 | [diff] [blame] | 1 | package sarama |
| 2 | |
| 3 | import ( |
| 4 | "encoding/binary" |
| 5 | "math" |
| 6 | ) |
| 7 | |
kesavand | c71914f | 2022-03-25 11:19:03 +0530 | [diff] [blame^] | 8 | var ( |
| 9 | errInvalidArrayLength = PacketDecodingError{"invalid array length"} |
| 10 | errInvalidByteSliceLength = PacketDecodingError{"invalid byteslice length"} |
| 11 | errInvalidStringLength = PacketDecodingError{"invalid string length"} |
| 12 | errVarintOverflow = PacketDecodingError{"varint overflow"} |
| 13 | errUVarintOverflow = PacketDecodingError{"uvarint overflow"} |
| 14 | errInvalidBool = PacketDecodingError{"invalid bool"} |
| 15 | ) |
kesavand | 2cde658 | 2020-06-22 04:56:23 -0400 | [diff] [blame] | 16 | |
| 17 | type realDecoder struct { |
| 18 | raw []byte |
| 19 | off int |
| 20 | stack []pushDecoder |
| 21 | } |
| 22 | |
| 23 | // primitives |
| 24 | |
| 25 | func (rd *realDecoder) getInt8() (int8, error) { |
| 26 | if rd.remaining() < 1 { |
| 27 | rd.off = len(rd.raw) |
| 28 | return -1, ErrInsufficientData |
| 29 | } |
| 30 | tmp := int8(rd.raw[rd.off]) |
| 31 | rd.off++ |
| 32 | return tmp, nil |
| 33 | } |
| 34 | |
| 35 | func (rd *realDecoder) getInt16() (int16, error) { |
| 36 | if rd.remaining() < 2 { |
| 37 | rd.off = len(rd.raw) |
| 38 | return -1, ErrInsufficientData |
| 39 | } |
| 40 | tmp := int16(binary.BigEndian.Uint16(rd.raw[rd.off:])) |
| 41 | rd.off += 2 |
| 42 | return tmp, nil |
| 43 | } |
| 44 | |
| 45 | func (rd *realDecoder) getInt32() (int32, error) { |
| 46 | if rd.remaining() < 4 { |
| 47 | rd.off = len(rd.raw) |
| 48 | return -1, ErrInsufficientData |
| 49 | } |
| 50 | tmp := int32(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 51 | rd.off += 4 |
| 52 | return tmp, nil |
| 53 | } |
| 54 | |
| 55 | func (rd *realDecoder) getInt64() (int64, error) { |
| 56 | if rd.remaining() < 8 { |
| 57 | rd.off = len(rd.raw) |
| 58 | return -1, ErrInsufficientData |
| 59 | } |
| 60 | tmp := int64(binary.BigEndian.Uint64(rd.raw[rd.off:])) |
| 61 | rd.off += 8 |
| 62 | return tmp, nil |
| 63 | } |
| 64 | |
| 65 | func (rd *realDecoder) getVarint() (int64, error) { |
| 66 | tmp, n := binary.Varint(rd.raw[rd.off:]) |
| 67 | if n == 0 { |
| 68 | rd.off = len(rd.raw) |
| 69 | return -1, ErrInsufficientData |
| 70 | } |
| 71 | if n < 0 { |
| 72 | rd.off -= n |
| 73 | return -1, errVarintOverflow |
| 74 | } |
| 75 | rd.off += n |
| 76 | return tmp, nil |
| 77 | } |
| 78 | |
kesavand | c71914f | 2022-03-25 11:19:03 +0530 | [diff] [blame^] | 79 | func (rd *realDecoder) getUVarint() (uint64, error) { |
| 80 | tmp, n := binary.Uvarint(rd.raw[rd.off:]) |
| 81 | if n == 0 { |
| 82 | rd.off = len(rd.raw) |
| 83 | return 0, ErrInsufficientData |
| 84 | } |
| 85 | |
| 86 | if n < 0 { |
| 87 | rd.off -= n |
| 88 | return 0, errUVarintOverflow |
| 89 | } |
| 90 | |
| 91 | rd.off += n |
| 92 | return tmp, nil |
| 93 | } |
| 94 | |
| 95 | func (rd *realDecoder) getFloat64() (float64, error) { |
| 96 | if rd.remaining() < 8 { |
| 97 | rd.off = len(rd.raw) |
| 98 | return -1, ErrInsufficientData |
| 99 | } |
| 100 | tmp := math.Float64frombits(binary.BigEndian.Uint64(rd.raw[rd.off:])) |
| 101 | rd.off += 8 |
| 102 | return tmp, nil |
| 103 | } |
| 104 | |
kesavand | 2cde658 | 2020-06-22 04:56:23 -0400 | [diff] [blame] | 105 | func (rd *realDecoder) getArrayLength() (int, error) { |
| 106 | if rd.remaining() < 4 { |
| 107 | rd.off = len(rd.raw) |
| 108 | return -1, ErrInsufficientData |
| 109 | } |
| 110 | tmp := int(int32(binary.BigEndian.Uint32(rd.raw[rd.off:]))) |
| 111 | rd.off += 4 |
| 112 | if tmp > rd.remaining() { |
| 113 | rd.off = len(rd.raw) |
| 114 | return -1, ErrInsufficientData |
| 115 | } else if tmp > 2*math.MaxUint16 { |
| 116 | return -1, errInvalidArrayLength |
| 117 | } |
| 118 | return tmp, nil |
| 119 | } |
| 120 | |
kesavand | c71914f | 2022-03-25 11:19:03 +0530 | [diff] [blame^] | 121 | func (rd *realDecoder) getCompactArrayLength() (int, error) { |
| 122 | n, err := rd.getUVarint() |
| 123 | if err != nil { |
| 124 | return 0, err |
| 125 | } |
| 126 | |
| 127 | if n == 0 { |
| 128 | return 0, nil |
| 129 | } |
| 130 | |
| 131 | return int(n) - 1, nil |
| 132 | } |
| 133 | |
kesavand | 2cde658 | 2020-06-22 04:56:23 -0400 | [diff] [blame] | 134 | func (rd *realDecoder) getBool() (bool, error) { |
| 135 | b, err := rd.getInt8() |
| 136 | if err != nil || b == 0 { |
| 137 | return false, err |
| 138 | } |
| 139 | if b != 1 { |
| 140 | return false, errInvalidBool |
| 141 | } |
| 142 | return true, nil |
| 143 | } |
| 144 | |
kesavand | c71914f | 2022-03-25 11:19:03 +0530 | [diff] [blame^] | 145 | func (rd *realDecoder) getEmptyTaggedFieldArray() (int, error) { |
| 146 | tagCount, err := rd.getUVarint() |
| 147 | if err != nil { |
| 148 | return 0, err |
| 149 | } |
| 150 | |
| 151 | // skip over any tagged fields without deserializing them |
| 152 | // as we don't currently support doing anything with them |
| 153 | for i := uint64(0); i < tagCount; i++ { |
| 154 | // fetch and ignore tag identifier |
| 155 | _, err := rd.getUVarint() |
| 156 | if err != nil { |
| 157 | return 0, err |
| 158 | } |
| 159 | length, err := rd.getUVarint() |
| 160 | if err != nil { |
| 161 | return 0, err |
| 162 | } |
| 163 | if _, err := rd.getRawBytes(int(length)); err != nil { |
| 164 | return 0, err |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | return 0, nil |
| 169 | } |
| 170 | |
kesavand | 2cde658 | 2020-06-22 04:56:23 -0400 | [diff] [blame] | 171 | // collections |
| 172 | |
| 173 | func (rd *realDecoder) getBytes() ([]byte, error) { |
| 174 | tmp, err := rd.getInt32() |
| 175 | if err != nil { |
| 176 | return nil, err |
| 177 | } |
| 178 | if tmp == -1 { |
| 179 | return nil, nil |
| 180 | } |
| 181 | |
| 182 | return rd.getRawBytes(int(tmp)) |
| 183 | } |
| 184 | |
| 185 | func (rd *realDecoder) getVarintBytes() ([]byte, error) { |
| 186 | tmp, err := rd.getVarint() |
| 187 | if err != nil { |
| 188 | return nil, err |
| 189 | } |
| 190 | if tmp == -1 { |
| 191 | return nil, nil |
| 192 | } |
| 193 | |
| 194 | return rd.getRawBytes(int(tmp)) |
| 195 | } |
| 196 | |
kesavand | c71914f | 2022-03-25 11:19:03 +0530 | [diff] [blame^] | 197 | func (rd *realDecoder) getCompactBytes() ([]byte, error) { |
| 198 | n, err := rd.getUVarint() |
| 199 | if err != nil { |
| 200 | return nil, err |
| 201 | } |
| 202 | |
| 203 | length := int(n - 1) |
| 204 | return rd.getRawBytes(length) |
| 205 | } |
| 206 | |
kesavand | 2cde658 | 2020-06-22 04:56:23 -0400 | [diff] [blame] | 207 | func (rd *realDecoder) getStringLength() (int, error) { |
| 208 | length, err := rd.getInt16() |
| 209 | if err != nil { |
| 210 | return 0, err |
| 211 | } |
| 212 | |
| 213 | n := int(length) |
| 214 | |
| 215 | switch { |
| 216 | case n < -1: |
| 217 | return 0, errInvalidStringLength |
| 218 | case n > rd.remaining(): |
| 219 | rd.off = len(rd.raw) |
| 220 | return 0, ErrInsufficientData |
| 221 | } |
| 222 | |
| 223 | return n, nil |
| 224 | } |
| 225 | |
| 226 | func (rd *realDecoder) getString() (string, error) { |
| 227 | n, err := rd.getStringLength() |
| 228 | if err != nil || n == -1 { |
| 229 | return "", err |
| 230 | } |
| 231 | |
| 232 | tmpStr := string(rd.raw[rd.off : rd.off+n]) |
| 233 | rd.off += n |
| 234 | return tmpStr, nil |
| 235 | } |
| 236 | |
| 237 | func (rd *realDecoder) getNullableString() (*string, error) { |
| 238 | n, err := rd.getStringLength() |
| 239 | if err != nil || n == -1 { |
| 240 | return nil, err |
| 241 | } |
| 242 | |
| 243 | tmpStr := string(rd.raw[rd.off : rd.off+n]) |
| 244 | rd.off += n |
| 245 | return &tmpStr, err |
| 246 | } |
| 247 | |
kesavand | c71914f | 2022-03-25 11:19:03 +0530 | [diff] [blame^] | 248 | func (rd *realDecoder) getCompactString() (string, error) { |
| 249 | n, err := rd.getUVarint() |
| 250 | if err != nil { |
| 251 | return "", err |
| 252 | } |
| 253 | |
| 254 | length := int(n - 1) |
| 255 | if length < 0 { |
| 256 | return "", errInvalidByteSliceLength |
| 257 | } |
| 258 | tmpStr := string(rd.raw[rd.off : rd.off+length]) |
| 259 | rd.off += length |
| 260 | return tmpStr, nil |
| 261 | } |
| 262 | |
| 263 | func (rd *realDecoder) getCompactNullableString() (*string, error) { |
| 264 | n, err := rd.getUVarint() |
| 265 | if err != nil { |
| 266 | return nil, err |
| 267 | } |
| 268 | |
| 269 | length := int(n - 1) |
| 270 | |
| 271 | if length < 0 { |
| 272 | return nil, err |
| 273 | } |
| 274 | |
| 275 | tmpStr := string(rd.raw[rd.off : rd.off+length]) |
| 276 | rd.off += length |
| 277 | return &tmpStr, err |
| 278 | } |
| 279 | |
| 280 | func (rd *realDecoder) getCompactInt32Array() ([]int32, error) { |
| 281 | n, err := rd.getUVarint() |
| 282 | if err != nil { |
| 283 | return nil, err |
| 284 | } |
| 285 | |
| 286 | if n == 0 { |
| 287 | return nil, nil |
| 288 | } |
| 289 | |
| 290 | arrayLength := int(n) - 1 |
| 291 | |
| 292 | ret := make([]int32, arrayLength) |
| 293 | |
| 294 | for i := range ret { |
| 295 | ret[i] = int32(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 296 | rd.off += 4 |
| 297 | } |
| 298 | return ret, nil |
| 299 | } |
| 300 | |
kesavand | 2cde658 | 2020-06-22 04:56:23 -0400 | [diff] [blame] | 301 | func (rd *realDecoder) getInt32Array() ([]int32, error) { |
| 302 | if rd.remaining() < 4 { |
| 303 | rd.off = len(rd.raw) |
| 304 | return nil, ErrInsufficientData |
| 305 | } |
| 306 | n := int(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 307 | rd.off += 4 |
| 308 | |
| 309 | if rd.remaining() < 4*n { |
| 310 | rd.off = len(rd.raw) |
| 311 | return nil, ErrInsufficientData |
| 312 | } |
| 313 | |
| 314 | if n == 0 { |
| 315 | return nil, nil |
| 316 | } |
| 317 | |
| 318 | if n < 0 { |
| 319 | return nil, errInvalidArrayLength |
| 320 | } |
| 321 | |
| 322 | ret := make([]int32, n) |
| 323 | for i := range ret { |
| 324 | ret[i] = int32(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 325 | rd.off += 4 |
| 326 | } |
| 327 | return ret, nil |
| 328 | } |
| 329 | |
| 330 | func (rd *realDecoder) getInt64Array() ([]int64, error) { |
| 331 | if rd.remaining() < 4 { |
| 332 | rd.off = len(rd.raw) |
| 333 | return nil, ErrInsufficientData |
| 334 | } |
| 335 | n := int(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 336 | rd.off += 4 |
| 337 | |
| 338 | if rd.remaining() < 8*n { |
| 339 | rd.off = len(rd.raw) |
| 340 | return nil, ErrInsufficientData |
| 341 | } |
| 342 | |
| 343 | if n == 0 { |
| 344 | return nil, nil |
| 345 | } |
| 346 | |
| 347 | if n < 0 { |
| 348 | return nil, errInvalidArrayLength |
| 349 | } |
| 350 | |
| 351 | ret := make([]int64, n) |
| 352 | for i := range ret { |
| 353 | ret[i] = int64(binary.BigEndian.Uint64(rd.raw[rd.off:])) |
| 354 | rd.off += 8 |
| 355 | } |
| 356 | return ret, nil |
| 357 | } |
| 358 | |
| 359 | func (rd *realDecoder) getStringArray() ([]string, error) { |
| 360 | if rd.remaining() < 4 { |
| 361 | rd.off = len(rd.raw) |
| 362 | return nil, ErrInsufficientData |
| 363 | } |
| 364 | n := int(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 365 | rd.off += 4 |
| 366 | |
| 367 | if n == 0 { |
| 368 | return nil, nil |
| 369 | } |
| 370 | |
| 371 | if n < 0 { |
| 372 | return nil, errInvalidArrayLength |
| 373 | } |
| 374 | |
| 375 | ret := make([]string, n) |
| 376 | for i := range ret { |
| 377 | str, err := rd.getString() |
| 378 | if err != nil { |
| 379 | return nil, err |
| 380 | } |
| 381 | |
| 382 | ret[i] = str |
| 383 | } |
| 384 | return ret, nil |
| 385 | } |
| 386 | |
| 387 | // subsets |
| 388 | |
| 389 | func (rd *realDecoder) remaining() int { |
| 390 | return len(rd.raw) - rd.off |
| 391 | } |
| 392 | |
| 393 | func (rd *realDecoder) getSubset(length int) (packetDecoder, error) { |
| 394 | buf, err := rd.getRawBytes(length) |
| 395 | if err != nil { |
| 396 | return nil, err |
| 397 | } |
| 398 | return &realDecoder{raw: buf}, nil |
| 399 | } |
| 400 | |
| 401 | func (rd *realDecoder) getRawBytes(length int) ([]byte, error) { |
| 402 | if length < 0 { |
| 403 | return nil, errInvalidByteSliceLength |
| 404 | } else if length > rd.remaining() { |
| 405 | rd.off = len(rd.raw) |
| 406 | return nil, ErrInsufficientData |
| 407 | } |
| 408 | |
| 409 | start := rd.off |
| 410 | rd.off += length |
| 411 | return rd.raw[start:rd.off], nil |
| 412 | } |
| 413 | |
| 414 | func (rd *realDecoder) peek(offset, length int) (packetDecoder, error) { |
| 415 | if rd.remaining() < offset+length { |
| 416 | return nil, ErrInsufficientData |
| 417 | } |
| 418 | off := rd.off + offset |
| 419 | return &realDecoder{raw: rd.raw[off : off+length]}, nil |
| 420 | } |
| 421 | |
| 422 | func (rd *realDecoder) peekInt8(offset int) (int8, error) { |
| 423 | const byteLen = 1 |
| 424 | if rd.remaining() < offset+byteLen { |
| 425 | return -1, ErrInsufficientData |
| 426 | } |
| 427 | return int8(rd.raw[rd.off+offset]), nil |
| 428 | } |
| 429 | |
| 430 | // stacks |
| 431 | |
| 432 | func (rd *realDecoder) push(in pushDecoder) error { |
| 433 | in.saveOffset(rd.off) |
| 434 | |
| 435 | var reserve int |
| 436 | if dpd, ok := in.(dynamicPushDecoder); ok { |
| 437 | if err := dpd.decode(rd); err != nil { |
| 438 | return err |
| 439 | } |
| 440 | } else { |
| 441 | reserve = in.reserveLength() |
| 442 | if rd.remaining() < reserve { |
| 443 | rd.off = len(rd.raw) |
| 444 | return ErrInsufficientData |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | rd.stack = append(rd.stack, in) |
| 449 | |
| 450 | rd.off += reserve |
| 451 | |
| 452 | return nil |
| 453 | } |
| 454 | |
| 455 | func (rd *realDecoder) pop() error { |
| 456 | // this is go's ugly pop pattern (the inverse of append) |
| 457 | in := rd.stack[len(rd.stack)-1] |
| 458 | rd.stack = rd.stack[:len(rd.stack)-1] |
| 459 | |
| 460 | return in.check(rd.off, rd.raw) |
| 461 | } |