segfault on OS X Mojave

[kousu]

I'm getting a segfault if I use GenericMultipleBarcodeReader. I'm on OS X Mojave and I installed zxing-cpp from brew.

It triggers on this image:

$ zxing --search-multi code.png 
Segmentation fault: 11

It does not trigger on this image:

$ zxing --search-multi table.png 
decoding failed

( I discovered this while trying to use the python wrapper: lubo/zxinglight#5 )

It seems like for some reason the thing ..compiled..wrong?? It's crashing in GenericMultipleBarcodeReader::translateResultPoints(). The disassembly is showing that it's trying to execute %rdi=*((void*)0x18) which doesn't make any sense.

$ lldb -- zxing --search-multi code.png 
(lldb) target create "zxing"
Current executable set to 'zxing' (x86_64).
(lldb) settings set -- target.run-args  "--search-multi" "code.png"
(lldb) run
Process 15820 launched: '/usr/local/bin/zxing' (x86_64)
Process 15820 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x18)
    frame #0: 0x00000001000483af zxing`zxing::multi::GenericMultipleBarcodeReader::translateResultPoints(zxing::Ref<zxing::Result>, int, int) + 249
zxing`zxing::multi::GenericMultipleBarcodeReader::translateResultPoints:
->  0x1000483af <+249>: movq   0x18, %rdi
    0x1000483b7 <+257>: cmpq   0x20, %rdi
    0x1000483bf <+265>: je     0x1000483dc               ; <+294>
    0x1000483c1 <+267>: movq   $0x0, (%rdi)
Target 0: (zxing) stopped.
(lldb)
(lldb) bt
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x18)
  * frame #0: 0x00000001000483af zxing`zxing::multi::GenericMultipleBarcodeReader::translateResultPoints(zxing::Ref<zxing::Result>, int, int) + 249
    frame #1: 0x00000001000478ef zxing`zxing::multi::GenericMultipleBarcodeReader::doDecodeMultiple(zxing::Ref<zxing::BinaryBitmap>, zxing::DecodeHints, std::__1::vector<zxing::Ref<zxing::Result>, std::__1::allocator<zxing::Ref<zxing::Result> > >&, int, int, int) + 315
    frame #2: 0x00000001000476c0 zxing`zxing::multi::GenericMultipleBarcodeReader::decodeMultiple(zxing::Ref<zxing::BinaryBitmap>, zxing::DecodeHints) + 116
    frame #3: 0x000000010001fc16 zxing`decode_multi(zxing::Ref<zxing::BinaryBitmap>, zxing::DecodeHints) + 123
    frame #4: 0x000000010001fea2 zxing`read_image(zxing::Ref<zxing::LuminanceSource>, bool, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >) + 450
    frame #5: 0x0000000100022251 zxing`main + 2747
    frame #6: 0x00007fff5c2b0ed9 libdyld.dylib`start + 1
    frame #7: 0x00007fff5c2b0ed9 libdyld.dylib`start + 1

[kousu]

Hmm. I built from master just now and instead see:

$ ./zxing -v code.png 
Hybrid binarizer succeeded: 
    {2-3}LZ7BDOso7qsr7cs0MV5NDQPYxEVeCMxsupw5zFGQf4GBn3u+nOcRjmKZT6UZO886fmqy/i6NTuUlc+otO6ZlpvXEVc0Dfvw1G+2s/zKElUi552dZv8bDvP88q89DmylL4bu6mtzTUKaDr+GI4WgoTZ
Global binarizer succeeded: 
    {2-3}LZ7BDOso7qsr7cs0MV5NDQPYxEVeCMxsupw5zFGQf4GBn3u+nOcRjmKZT6UZO886fmqy/i6NTuUlc+otO6ZlpvXEVc0Dfvw1G+2s/zKElUi552dZv8bDvP88q89DmylL4bu6mtzTUKaDr+GI4WgoTZ
$ ./zxing -v --search-multi code.png 
Hybrid binarizer failed: zxing::IllegalArgumentException: This luminance source does not support cropping.
Global binarizer failed: zxing::IllegalArgumentException: This luminance source does not support cropping.

[Benjamin-Dobell]

It's not binary compatible, but have you looked into https://github.com/nu-book/zxing-cpp?

I'm very seriously considering deprecating this repository because their port is an fresh idiomatic port to C++, rather than the attempted 1-to-1 Java to C++ port that exists here.

[kousu]

Ah, no I hadn't seen that. I found yours because it's what the python and brew versions use.

I also found https://github.com/dlbeer/quirc/ which is interesting: it's written in a minimalist BSD style, but it still comes with both encoding, decoding, and even webcam support (on OpenBSD and Linux, no Darwin 😢 )