Method parseIndex

src/parser/object-stream-parser.ts:107–142

* Parse the index section of the object stream. * Returns array of (objNum, offset) pairs.

()

   * Returns array of (objNum, offset) pairs.
   */
  private parseIndex(): ObjectStreamEntry[] {
    const result: ObjectStreamEntry[] = [];

    if (this.decodedData === null) {
      throw new ObjectParseError("Decoded data not parsed");
    }

    // Create scanner for the index portion only
    const indexData = this.decodedData.subarray(0, this.first);
    const scanner = new Scanner(indexData);
    const reader = new TokenReader(scanner);

    for (let i = 0; i < this.n; i++) {
      const objNumToken = reader.nextToken();
      const offsetToken = reader.nextToken();

      if (objNumToken.type !== "number") {
        throw new ObjectParseError(
          `Invalid object stream index at entry ${i}: expected object number, got ${objNumToken.type}`,
        );
      }

      if (offsetToken.type !== "number") {
        throw new ObjectParseError(
          `Invalid object stream index at entry ${i}: expected offset, got ${offsetToken.type}`,
        );
      }

      result.push({
        objNum: objNumToken.value,
        offset: offsetToken.value,
      });
    }

    return result;
  }

  /**
   * Get an object by its index within the stream.