public int getProgramLen() {
        return stubBytes == null ? 0 : stubBytes.length;
    }
Returns the length (in bytes) of the DOS
program.
<p>
In other words:
<code>e_lfanew() - SIZEOF_DOS_HEADER</code>

@return  the length (in bytes)
Ghidra/Features/Base/src/main/java/ghidra/app/util/bin/format/mz/DOSHeader.java