khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame] | 1 | package sarama |
| 2 | |
| 3 | import ( |
| 4 | "encoding/binary" |
| 5 | "math" |
| 6 | ) |
| 7 | |
khenaidoo | d948f77 | 2021-08-11 17:49:24 -0400 | [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 | errUnsupportedTaggedFields = PacketDecodingError{"non-empty tagged fields are not supported yet"} |
| 16 | ) |
khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame] | 17 | |
| 18 | type realDecoder struct { |
| 19 | raw []byte |
| 20 | off int |
| 21 | stack []pushDecoder |
| 22 | } |
| 23 | |
| 24 | // primitives |
| 25 | |
| 26 | func (rd *realDecoder) getInt8() (int8, error) { |
| 27 | if rd.remaining() < 1 { |
| 28 | rd.off = len(rd.raw) |
| 29 | return -1, ErrInsufficientData |
| 30 | } |
| 31 | tmp := int8(rd.raw[rd.off]) |
| 32 | rd.off++ |
| 33 | return tmp, nil |
| 34 | } |
| 35 | |
| 36 | func (rd *realDecoder) getInt16() (int16, error) { |
| 37 | if rd.remaining() < 2 { |
| 38 | rd.off = len(rd.raw) |
| 39 | return -1, ErrInsufficientData |
| 40 | } |
| 41 | tmp := int16(binary.BigEndian.Uint16(rd.raw[rd.off:])) |
| 42 | rd.off += 2 |
| 43 | return tmp, nil |
| 44 | } |
| 45 | |
| 46 | func (rd *realDecoder) getInt32() (int32, error) { |
| 47 | if rd.remaining() < 4 { |
| 48 | rd.off = len(rd.raw) |
| 49 | return -1, ErrInsufficientData |
| 50 | } |
| 51 | tmp := int32(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 52 | rd.off += 4 |
| 53 | return tmp, nil |
| 54 | } |
| 55 | |
| 56 | func (rd *realDecoder) getInt64() (int64, error) { |
| 57 | if rd.remaining() < 8 { |
| 58 | rd.off = len(rd.raw) |
| 59 | return -1, ErrInsufficientData |
| 60 | } |
| 61 | tmp := int64(binary.BigEndian.Uint64(rd.raw[rd.off:])) |
| 62 | rd.off += 8 |
| 63 | return tmp, nil |
| 64 | } |
| 65 | |
| 66 | func (rd *realDecoder) getVarint() (int64, error) { |
| 67 | tmp, n := binary.Varint(rd.raw[rd.off:]) |
| 68 | if n == 0 { |
| 69 | rd.off = len(rd.raw) |
| 70 | return -1, ErrInsufficientData |
| 71 | } |
| 72 | if n < 0 { |
| 73 | rd.off -= n |
| 74 | return -1, errVarintOverflow |
| 75 | } |
| 76 | rd.off += n |
| 77 | return tmp, nil |
| 78 | } |
| 79 | |
khenaidoo | d948f77 | 2021-08-11 17:49:24 -0400 | [diff] [blame] | 80 | func (rd *realDecoder) getUVarint() (uint64, error) { |
| 81 | tmp, n := binary.Uvarint(rd.raw[rd.off:]) |
| 82 | if n == 0 { |
| 83 | rd.off = len(rd.raw) |
| 84 | return 0, ErrInsufficientData |
| 85 | } |
| 86 | |
| 87 | if n < 0 { |
| 88 | rd.off -= n |
| 89 | return 0, errUVarintOverflow |
| 90 | } |
| 91 | |
| 92 | rd.off += n |
| 93 | return tmp, nil |
| 94 | } |
| 95 | |
khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame] | 96 | func (rd *realDecoder) getArrayLength() (int, error) { |
| 97 | if rd.remaining() < 4 { |
| 98 | rd.off = len(rd.raw) |
| 99 | return -1, ErrInsufficientData |
| 100 | } |
| 101 | tmp := int(int32(binary.BigEndian.Uint32(rd.raw[rd.off:]))) |
| 102 | rd.off += 4 |
| 103 | if tmp > rd.remaining() { |
| 104 | rd.off = len(rd.raw) |
| 105 | return -1, ErrInsufficientData |
| 106 | } else if tmp > 2*math.MaxUint16 { |
| 107 | return -1, errInvalidArrayLength |
| 108 | } |
| 109 | return tmp, nil |
| 110 | } |
| 111 | |
khenaidoo | d948f77 | 2021-08-11 17:49:24 -0400 | [diff] [blame] | 112 | func (rd *realDecoder) getCompactArrayLength() (int, error) { |
| 113 | n, err := rd.getUVarint() |
| 114 | if err != nil { |
| 115 | return 0, err |
| 116 | } |
| 117 | |
| 118 | if n == 0 { |
| 119 | return 0, nil |
| 120 | } |
| 121 | |
| 122 | return int(n) - 1, nil |
| 123 | } |
| 124 | |
khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame] | 125 | func (rd *realDecoder) getBool() (bool, error) { |
| 126 | b, err := rd.getInt8() |
| 127 | if err != nil || b == 0 { |
| 128 | return false, err |
| 129 | } |
| 130 | if b != 1 { |
| 131 | return false, errInvalidBool |
| 132 | } |
| 133 | return true, nil |
| 134 | } |
| 135 | |
khenaidoo | d948f77 | 2021-08-11 17:49:24 -0400 | [diff] [blame] | 136 | func (rd *realDecoder) getEmptyTaggedFieldArray() (int, error) { |
| 137 | tagCount, err := rd.getUVarint() |
| 138 | if err != nil { |
| 139 | return 0, err |
| 140 | } |
| 141 | |
| 142 | if tagCount != 0 { |
| 143 | return 0, errUnsupportedTaggedFields |
| 144 | } |
| 145 | |
| 146 | return 0, nil |
| 147 | } |
| 148 | |
khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame] | 149 | // collections |
| 150 | |
| 151 | func (rd *realDecoder) getBytes() ([]byte, error) { |
| 152 | tmp, err := rd.getInt32() |
| 153 | if err != nil { |
| 154 | return nil, err |
| 155 | } |
| 156 | if tmp == -1 { |
| 157 | return nil, nil |
| 158 | } |
| 159 | |
| 160 | return rd.getRawBytes(int(tmp)) |
| 161 | } |
| 162 | |
| 163 | func (rd *realDecoder) getVarintBytes() ([]byte, error) { |
| 164 | tmp, err := rd.getVarint() |
| 165 | if err != nil { |
| 166 | return nil, err |
| 167 | } |
| 168 | if tmp == -1 { |
| 169 | return nil, nil |
| 170 | } |
| 171 | |
| 172 | return rd.getRawBytes(int(tmp)) |
| 173 | } |
| 174 | |
khenaidoo | d948f77 | 2021-08-11 17:49:24 -0400 | [diff] [blame] | 175 | func (rd *realDecoder) getCompactBytes() ([]byte, error) { |
| 176 | n, err := rd.getUVarint() |
| 177 | if err != nil { |
| 178 | return nil, err |
| 179 | } |
| 180 | |
| 181 | length := int(n - 1) |
| 182 | return rd.getRawBytes(length) |
| 183 | } |
| 184 | |
khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame] | 185 | func (rd *realDecoder) getStringLength() (int, error) { |
| 186 | length, err := rd.getInt16() |
| 187 | if err != nil { |
| 188 | return 0, err |
| 189 | } |
| 190 | |
| 191 | n := int(length) |
| 192 | |
| 193 | switch { |
| 194 | case n < -1: |
| 195 | return 0, errInvalidStringLength |
| 196 | case n > rd.remaining(): |
| 197 | rd.off = len(rd.raw) |
| 198 | return 0, ErrInsufficientData |
| 199 | } |
| 200 | |
| 201 | return n, nil |
| 202 | } |
| 203 | |
| 204 | func (rd *realDecoder) getString() (string, error) { |
| 205 | n, err := rd.getStringLength() |
| 206 | if err != nil || n == -1 { |
| 207 | return "", err |
| 208 | } |
| 209 | |
| 210 | tmpStr := string(rd.raw[rd.off : rd.off+n]) |
| 211 | rd.off += n |
| 212 | return tmpStr, nil |
| 213 | } |
| 214 | |
| 215 | func (rd *realDecoder) getNullableString() (*string, error) { |
| 216 | n, err := rd.getStringLength() |
| 217 | if err != nil || n == -1 { |
| 218 | return nil, err |
| 219 | } |
| 220 | |
| 221 | tmpStr := string(rd.raw[rd.off : rd.off+n]) |
| 222 | rd.off += n |
| 223 | return &tmpStr, err |
| 224 | } |
| 225 | |
khenaidoo | d948f77 | 2021-08-11 17:49:24 -0400 | [diff] [blame] | 226 | func (rd *realDecoder) getCompactString() (string, error) { |
| 227 | n, err := rd.getUVarint() |
| 228 | if err != nil { |
| 229 | return "", err |
| 230 | } |
| 231 | |
| 232 | length := int(n - 1) |
| 233 | |
| 234 | tmpStr := string(rd.raw[rd.off : rd.off+length]) |
| 235 | rd.off += length |
| 236 | return tmpStr, nil |
| 237 | } |
| 238 | |
| 239 | func (rd *realDecoder) getCompactNullableString() (*string, error) { |
| 240 | n, err := rd.getUVarint() |
| 241 | if err != nil { |
| 242 | return nil, err |
| 243 | } |
| 244 | |
| 245 | length := int(n - 1) |
| 246 | |
| 247 | if length < 0 { |
| 248 | return nil, err |
| 249 | } |
| 250 | |
| 251 | tmpStr := string(rd.raw[rd.off : rd.off+length]) |
| 252 | rd.off += length |
| 253 | return &tmpStr, err |
| 254 | } |
| 255 | |
| 256 | func (rd *realDecoder) getCompactInt32Array() ([]int32, error) { |
| 257 | n, err := rd.getUVarint() |
| 258 | if err != nil { |
| 259 | return nil, err |
| 260 | } |
| 261 | |
| 262 | if n == 0 { |
| 263 | return nil, nil |
| 264 | } |
| 265 | |
| 266 | arrayLength := int(n) - 1 |
| 267 | |
| 268 | ret := make([]int32, arrayLength) |
| 269 | |
| 270 | for i := range ret { |
| 271 | ret[i] = int32(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 272 | rd.off += 4 |
| 273 | } |
| 274 | return ret, nil |
| 275 | } |
| 276 | |
khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame] | 277 | func (rd *realDecoder) getInt32Array() ([]int32, error) { |
| 278 | if rd.remaining() < 4 { |
| 279 | rd.off = len(rd.raw) |
| 280 | return nil, ErrInsufficientData |
| 281 | } |
| 282 | n := int(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 283 | rd.off += 4 |
| 284 | |
| 285 | if rd.remaining() < 4*n { |
| 286 | rd.off = len(rd.raw) |
| 287 | return nil, ErrInsufficientData |
| 288 | } |
| 289 | |
| 290 | if n == 0 { |
| 291 | return nil, nil |
| 292 | } |
| 293 | |
| 294 | if n < 0 { |
| 295 | return nil, errInvalidArrayLength |
| 296 | } |
| 297 | |
| 298 | ret := make([]int32, n) |
| 299 | for i := range ret { |
| 300 | ret[i] = int32(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 301 | rd.off += 4 |
| 302 | } |
| 303 | return ret, nil |
| 304 | } |
| 305 | |
| 306 | func (rd *realDecoder) getInt64Array() ([]int64, error) { |
| 307 | if rd.remaining() < 4 { |
| 308 | rd.off = len(rd.raw) |
| 309 | return nil, ErrInsufficientData |
| 310 | } |
| 311 | n := int(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 312 | rd.off += 4 |
| 313 | |
| 314 | if rd.remaining() < 8*n { |
| 315 | rd.off = len(rd.raw) |
| 316 | return nil, ErrInsufficientData |
| 317 | } |
| 318 | |
| 319 | if n == 0 { |
| 320 | return nil, nil |
| 321 | } |
| 322 | |
| 323 | if n < 0 { |
| 324 | return nil, errInvalidArrayLength |
| 325 | } |
| 326 | |
| 327 | ret := make([]int64, n) |
| 328 | for i := range ret { |
| 329 | ret[i] = int64(binary.BigEndian.Uint64(rd.raw[rd.off:])) |
| 330 | rd.off += 8 |
| 331 | } |
| 332 | return ret, nil |
| 333 | } |
| 334 | |
| 335 | func (rd *realDecoder) getStringArray() ([]string, error) { |
| 336 | if rd.remaining() < 4 { |
| 337 | rd.off = len(rd.raw) |
| 338 | return nil, ErrInsufficientData |
| 339 | } |
| 340 | n := int(binary.BigEndian.Uint32(rd.raw[rd.off:])) |
| 341 | rd.off += 4 |
| 342 | |
| 343 | if n == 0 { |
| 344 | return nil, nil |
| 345 | } |
| 346 | |
| 347 | if n < 0 { |
| 348 | return nil, errInvalidArrayLength |
| 349 | } |
| 350 | |
| 351 | ret := make([]string, n) |
| 352 | for i := range ret { |
| 353 | str, err := rd.getString() |
| 354 | if err != nil { |
| 355 | return nil, err |
| 356 | } |
| 357 | |
| 358 | ret[i] = str |
| 359 | } |
| 360 | return ret, nil |
| 361 | } |
| 362 | |
| 363 | // subsets |
| 364 | |
| 365 | func (rd *realDecoder) remaining() int { |
| 366 | return len(rd.raw) - rd.off |
| 367 | } |
| 368 | |
| 369 | func (rd *realDecoder) getSubset(length int) (packetDecoder, error) { |
| 370 | buf, err := rd.getRawBytes(length) |
| 371 | if err != nil { |
| 372 | return nil, err |
| 373 | } |
| 374 | return &realDecoder{raw: buf}, nil |
| 375 | } |
| 376 | |
| 377 | func (rd *realDecoder) getRawBytes(length int) ([]byte, error) { |
| 378 | if length < 0 { |
| 379 | return nil, errInvalidByteSliceLength |
| 380 | } else if length > rd.remaining() { |
| 381 | rd.off = len(rd.raw) |
| 382 | return nil, ErrInsufficientData |
| 383 | } |
| 384 | |
| 385 | start := rd.off |
| 386 | rd.off += length |
| 387 | return rd.raw[start:rd.off], nil |
| 388 | } |
| 389 | |
| 390 | func (rd *realDecoder) peek(offset, length int) (packetDecoder, error) { |
| 391 | if rd.remaining() < offset+length { |
| 392 | return nil, ErrInsufficientData |
| 393 | } |
| 394 | off := rd.off + offset |
| 395 | return &realDecoder{raw: rd.raw[off : off+length]}, nil |
| 396 | } |
| 397 | |
Scott Baker | 8461e15 | 2019-10-01 14:44:30 -0700 | [diff] [blame] | 398 | func (rd *realDecoder) peekInt8(offset int) (int8, error) { |
| 399 | const byteLen = 1 |
| 400 | if rd.remaining() < offset+byteLen { |
| 401 | return -1, ErrInsufficientData |
| 402 | } |
| 403 | return int8(rd.raw[rd.off+offset]), nil |
| 404 | } |
| 405 | |
khenaidoo | ac63710 | 2019-01-14 15:44:34 -0500 | [diff] [blame] | 406 | // stacks |
| 407 | |
| 408 | func (rd *realDecoder) push(in pushDecoder) error { |
| 409 | in.saveOffset(rd.off) |
| 410 | |
| 411 | var reserve int |
| 412 | if dpd, ok := in.(dynamicPushDecoder); ok { |
| 413 | if err := dpd.decode(rd); err != nil { |
| 414 | return err |
| 415 | } |
| 416 | } else { |
| 417 | reserve = in.reserveLength() |
| 418 | if rd.remaining() < reserve { |
| 419 | rd.off = len(rd.raw) |
| 420 | return ErrInsufficientData |
| 421 | } |
| 422 | } |
| 423 | |
| 424 | rd.stack = append(rd.stack, in) |
| 425 | |
| 426 | rd.off += reserve |
| 427 | |
| 428 | return nil |
| 429 | } |
| 430 | |
| 431 | func (rd *realDecoder) pop() error { |
| 432 | // this is go's ugly pop pattern (the inverse of append) |
| 433 | in := rd.stack[len(rd.stack)-1] |
| 434 | rd.stack = rd.stack[:len(rd.stack)-1] |
| 435 | |
| 436 | return in.check(rd.off, rd.raw) |
| 437 | } |