Bugs in pdf2json

[leocstone]

Hello,

I recently discovered 3 separate inputs that can cause pdf2json to crash (with different stack traces). On Windows 10, one causes a stack buffer overrun exception in pdf2json.exe, one causes the same exception in ntdll.dll, and one causes a stack overflow exception. Please find example inputs attached. Tested with the following command line:
pdf2json.exe /dev/null
inputs.zip