Method findEndStream

src/parser/indirect-object-parser.ts:310–349

* Scan forward from startPos looking for the "endstream" keyword. * Returns the stream data length (excluding any EOL before endstream), * or -1 if not found.

(startPos: number)

   * or -1 if not found.
   */
  private findEndStream(startPos: number): number {
    const bytes = this.scanner.bytes;
    const len = bytes.length;

    // "endstream" as byte values
    const sig = [0x65, 0x6e, 0x64, 0x73, 0x74, 0x72, 0x65, 0x61, 0x6d];
    const sigLen = sig.length;

    for (let i = startPos; i <= len - sigLen; i++) {
      let match = true;

      for (let j = 0; j < sigLen; j++) {
        if (bytes[i + j] !== sig[j]) {
          match = false;
          break;
        }
      }

      if (match) {
        // Found "endstream" at position i.
        // Strip the optional EOL that precedes it (part of stream framing,
        // not stream data — per PDF spec 7.3.8.1).
        let end = i;

        if (end > startPos && bytes[end - 1] === LF) {
          end--;

          if (end > startPos && bytes[end - 1] === CR) {
            end--;
          }
        } else if (end > startPos && bytes[end - 1] === CR) {
          end--;
        }

        return end - startPos;
      }
    }

    return -1;
  }

  /**
   * Resolve the /Length value from the stream dict.