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in `cc_binary_string()`, ticket #300 (#5 & #6), props Andre Maute; add other checks for length on processing encoding mode PDF417: fix out-of-bounds crash on overrunning string and codeword buffers by tripling size (convert to `short` instead of `int` to guard against too much stack), ticket #300 (#7 & #10), props Andre Maute; (TODO: add some checks instead to bail out earlier?) CODEONE: fix looping on latch crash in `c1_encode()`, ticket #300 (#8), props Andre Maute CODABLOCKF: fix crash on negative overflow of `columns` (`option_2`), ticket #300 (#9), props Andre Maute library: add `debug_print_escape()` helper for ZINT_DEBUG_PRINT