Next moves the iterator forward, returning true if there a KSUID was found, or false if the iterator as reached the end of the set it was created from.
()
| 270 | // Next moves the iterator forward, returning true if there a KSUID was found, |
| 271 | // or false if the iterator as reached the end of the set it was created from. |
| 272 | func (it *CompressedSetIter) Next() bool { |
| 273 | if it.seqlength != 0 { |
| 274 | value := incr128(it.lastValue) |
| 275 | it.KSUID = value.ksuid(it.timestamp) |
| 276 | it.seqlength-- |
| 277 | it.lastValue = value |
| 278 | return true |
| 279 | } |
| 280 | |
| 281 | if it.offset == len(it.content) { |
| 282 | return false |
| 283 | } |
| 284 | |
| 285 | b := it.content[it.offset] |
| 286 | it.offset++ |
| 287 | |
| 288 | const mask = rawKSUID | timeDelta | payloadDelta | payloadRange |
| 289 | tag := int(b) & mask |
| 290 | cnt := int(b) & ^mask |
| 291 | |
| 292 | switch tag { |
| 293 | case rawKSUID: |
| 294 | off0 := it.offset |
| 295 | off1 := off0 + byteLength |
| 296 | |
| 297 | copy(it.KSUID[:], it.content[off0:off1]) |
| 298 | |
| 299 | it.offset = off1 |
| 300 | it.timestamp = it.KSUID.Timestamp() |
| 301 | it.lastValue = uint128Payload(it.KSUID) |
| 302 | |
| 303 | case timeDelta: |
| 304 | off0 := it.offset |
| 305 | off1 := off0 + cnt |
| 306 | off2 := off1 + payloadLengthInBytes |
| 307 | |
| 308 | it.timestamp += varint32(it.content[off0:off1]) |
| 309 | |
| 310 | binary.BigEndian.PutUint32(it.KSUID[:timestampLengthInBytes], it.timestamp) |
| 311 | copy(it.KSUID[timestampLengthInBytes:], it.content[off1:off2]) |
| 312 | |
| 313 | it.offset = off2 |
| 314 | it.lastValue = uint128Payload(it.KSUID) |
| 315 | |
| 316 | case payloadDelta: |
| 317 | off0 := it.offset |
| 318 | off1 := off0 + cnt |
| 319 | |
| 320 | delta := varint128(it.content[off0:off1]) |
| 321 | value := add128(it.lastValue, delta) |
| 322 | |
| 323 | it.KSUID = value.ksuid(it.timestamp) |
| 324 | it.offset = off1 |
| 325 | it.lastValue = value |
| 326 | |
| 327 | case payloadRange: |
| 328 | off0 := it.offset |
| 329 | off1 := off0 + cnt |