typia/lib/internal/_ProtobufReader.mjs.map

Superfast runtime validators with only one line

{"version":3,"file":"_ProtobufReader.mjs","names":[],"sources":["../../src/internal/_ProtobufReader.ts"],"sourcesContent":["import { ProtobufWire } from \"@typia/interface\";\nimport { Singleton } from \"@typia/utils\";\n\n/// @reference https://github.com/piotr-oles/as-proto/blob/main/packages/as-proto/assembly/internal/FixedReader.ts\nexport class _ProtobufReader {\n  /** Read buffer */\n  private buf: Uint8Array;\n\n  /** Read buffer pointer. */\n  private ptr: number;\n\n  /** DataView for buffer. */\n  private view: DataView;\n\n  /** Current length-delimited boundary. */\n  private end: number;\n\n  public constructor(buf: Uint8Array) {\n    this.buf = buf;\n    this.ptr = 0;\n    this.view = new DataView(buf.buffer, buf.byteOffset, buf.byteLength);\n    this.end = buf.length;\n  }\n\n  public index(): number {\n    return this.ptr;\n  }\n\n  public size(): number {\n    return this.end;\n  }\n\n  public uint32(): number {\n    return this.varint32() >>> 0;\n  }\n\n  public int32(): number {\n    return this.varint32();\n  }\n\n  public sint32(): number {\n    const value: number = this.varint32();\n    return (value >>> 1) ^ -(value & 1);\n  }\n\n  public uint64(): bigint {\n    return this.varint64();\n  }\n\n  public int64(): bigint {\n    return BigInt.asIntN(64, this.varint64());\n  }\n\n  public sint64(): bigint {\n    const value = this.varint64();\n    return (value >> BigInt(0x01)) ^ -(value & BigInt(0x01));\n  }\n\n  public bool(): boolean {\n    return this.varint32() !== 0;\n  }\n\n  public float(): number {\n    return this.view.getFloat32(this.take(4), true);\n  }\n\n  public double(): number {\n    return this.view.getFloat64(this.take(8), true);\n  }\n\n  public bytes(): Uint8Array {\n    return this.atomic(() => {\n      const length: number = this.uint32();\n      const from: number = this.take(length);\n      return this.buf.subarray(from, from + length);\n    });\n  }\n\n  public string(): string {\n    const bytes: Uint8Array = this.bytes();\n    const decoder: TextDecoder = utf8.get();\n    try {\n      return decoder.decode(bytes);\n    } catch {\n      throw error(\"invalid UTF-8 string.\");\n    }\n  }\n\n  public fork(): number {\n    return this.atomic(() => {\n      const previous: number = this.end;\n      const length: number = this.uint32();\n      this.validate(length);\n      this.end = this.ptr + length;\n      return previous;\n    });\n  }\n\n  public close(previous: number): void {\n    if (this.ptr !== this.end) throw error(\"buffer overflow.\");\n    this.end = previous;\n  }\n\n  /** Advance by exactly `length` bytes, for every length including zero. */\n  public skip(length: number): void {\n    this.take(length);\n  }\n\n  /**\n   * Advance by exactly one varint, which carries no length prefix.\n   *\n   * A varint terminates at its first byte without the continuation bit, and may\n   * occupy no more than {@link VARINT_MAX_BYTES}. Its tenth byte is bounded\n   * twice over, by {@link lastVarintByte}: it may neither continue into an\n   * eleventh byte nor carry payload above bit 63. Skipping is where that is\n   * easiest to get wrong, because this path discards the bytes it reads and so\n   * never notices a value it could not have represented. Relaxing either bound\n   * here would accept a varint that `varint32` and `varint64` reject, making\n   * the limit depend on which method happens to consume the value.\n   */\n  public skipVarint(): void {\n    this.atomic(() => {\n      for (let i: number = 1; i < VARINT_MAX_BYTES; ++i)\n        if ((this.u8() & 0x80) === 0) return;\n      this.lastVarintByte();\n    });\n  }\n\n  public skipType(wireType: ProtobufWire): void {\n    this.atomic(() => {\n      switch (wireType) {\n        case ProtobufWire.VARIANT:\n          this.skipVarint();\n          break;\n        case ProtobufWire.I64:\n          this.skip(8);\n          break;\n        case ProtobufWire.LEN:\n          this.skip(this.uint32());\n          break;\n        case ProtobufWire.START_GROUP:\n          while ((wireType = this.uint32() & 0x07) !== ProtobufWire.END_GROUP)\n            this.skipType(wireType);\n          break;\n        case ProtobufWire.I32:\n          this.skip(4);\n          break;\n        default:\n          throw error(`invalid wire type ${wireType} at offset ${this.ptr}.`);\n      }\n    });\n  }\n\n  private varint32(): number {\n    let loaded: number;\n    let value: number;\n\n    value = (loaded = this.u8()) & 0x7f;\n    if (loaded < 0x80) return value;\n\n    value |= ((loaded = this.u8()) & 0x7f) << 7;\n    if (loaded < 0x80) return value;\n\n    value |= ((loaded = this.u8()) & 0x7f) << 14;\n    if (loaded < 0x80) return value;\n\n    value |= ((loaded = this.u8()) & 0x7f) << 21;\n    if (loaded < 0x80) return value;\n\n    value |= ((loaded = this.u8()) & 0xf) << 28;\n    if (loaded < 0x80) return value;\n\n    // increment position until there is no continuation bit, or until this read\n    // reaches VARINT_MAX_BYTES and the value can hold no further bits\n    if (this.u8() < 0x80) return value;\n    if (this.u8() < 0x80) return value;\n    if (this.u8() < 0x80) return value;\n    if (this.u8() < 0x80) return value;\n    this.lastVarintByte();\n    return value;\n  }\n\n  private varint64(): bigint {\n    let loaded: bigint;\n    let value: bigint;\n\n    value = (loaded = this.u8n()) & BigInt(0x7f);\n    if (loaded < BigInt(0x80)) return value;\n\n    value |= ((loaded = this.u8n()) & BigInt(0x7f)) << BigInt(7);\n    if (loaded < BigInt(0x80)) return value;\n\n    value |= ((loaded = this.u8n()) & BigInt(0x7f)) << BigInt(14);\n    if (loaded < BigInt(0x80)) return value;\n\n    value |= ((loaded = this.u8n()) & BigInt(0x7f)) << BigInt(21);\n    if (loaded < BigInt(0x80)) return value;\n\n    value |= ((loaded = this.u8n()) & BigInt(0x7f)) << BigInt(28);\n    if (loaded < BigInt(0x80)) return value;\n\n    value |= ((loaded = this.u8n()) & BigInt(0x7f)) << BigInt(35);\n    if (loaded < BigInt(0x80)) return value;\n\n    value |= ((loaded = this.u8n()) & BigInt(0x7f)) << BigInt(42);\n    if (loaded < BigInt(0x80)) return value;\n\n    value |= ((loaded = this.u8n()) & BigInt(0x7f)) << BigInt(49);\n    if (loaded < BigInt(0x80)) return value;\n\n    value |= ((loaded = this.u8n()) & BigInt(0x7f)) << BigInt(56);\n    if (loaded < BigInt(0x80)) return value;\n\n    value |= BigInt(this.lastVarintByte()) << BigInt(63);\n    return BigInt.asUintN(64, value);\n  }\n\n  /**\n   * Read the only byte whose varint payload is limited to bit 63.\n   *\n   * Two distinct faults meet on this byte, and each is named for what it is. A\n   * continuation bit means the varint would occupy an eleventh byte, which no\n   * 64-bit value can reach. Any other payload bit means the varint terminates\n   * within its ten bytes but carries a value bit above 63. Reporting the second\n   * as a length fault would tell the caller something untrue about a payload\n   * that is exactly ten bytes long.\n   */\n  private lastVarintByte(): number {\n    const loaded: number = this.u8();\n    if ((loaded & 0x80) !== 0)\n      throw error(`varint exceeds ${VARINT_MAX_BYTES} bytes.`);\n    if (loaded > 0x01) throw error(`varint exceeds ${VARINT_MAX_BITS} bits.`);\n    return loaded;\n  }\n\n  private u8(): number {\n    return this.view.getUint8(this.take(1));\n  }\n\n  private u8n(): bigint {\n    return BigInt(this.u8());\n  }\n\n  private take(length: number): number {\n    this.validate(length);\n    const from: number = this.ptr;\n    this.ptr += length;\n    return from;\n  }\n\n  private atomic<T>(closure: () => T): T {\n    const index: number = this.ptr;\n    const end: number = this.end;\n    try {\n      return closure();\n    } catch (thrown) {\n      this.ptr = index;\n      this.end = end;\n      throw thrown;\n    }\n  }\n\n  private validate(length: number): void {\n    if (\n      Number.isSafeInteger(length) === false ||\n      length < 0 ||\n      length > this.size() - this.ptr\n    )\n      throw error(\"buffer overflow.\");\n  }\n}\n\n/**\n * Builds every fault this reader raises, so each one names typia as its source.\n *\n * Every decode error a caller can see must be attributable, and the prefix is\n * what attributes it. Composing it here rather than at each throw keeps a new\n * fault from silently shipping without it.\n */\nconst error = (message: string): Error =>\n  new Error(`Error on typia.protobuf.decode(): ${message}`);\n\n/**\n * The most bytes a varint may occupy: a 64-bit value in seven-bit groups.\n *\n * Every path reads no further than its tenth byte and accepts only bit 63 from\n * that byte. This constant keeps the loop-driven skip path on the same limit.\n */\nconst VARINT_MAX_BYTES = 10;\n\n/**\n * The widest value a varint may carry: the 64-bit Protocol Buffer wire domain.\n *\n * The tenth byte reaches only bit 63, so a payload bit above it belongs to no\n * representable value. 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