Function LLVMFuzzerTestOneInput

fuzzing/fuzz_parser.cpp:88–142

extern "C"
int
LLVMFuzzerTestOneInput(
        const uint8_t* data, size_t size)
{
    if(size<=5)
        return 0;

    FuzzHelper fh;

    // set parse options
    fh.opt.allow_comments=!!(data[0]&0x1);
    fh.opt.allow_trailing_commas=!!(data[0]&0x2);
    fh.opt.allow_invalid_utf8=!!(data[0]&0x4);
    fh.opt.max_depth= (data[0]>>3);

    // select memory strategy to use
    const int strategy=data[1] & 0x3;

    // select number precision to use
    const int precision=((data[1] & 0xC) >> 2) % 3;
    fh.opt.numbers = static_cast<number_precision>(precision);

    // memory limits
    fh.memlimit1=data[2]*256+data[3];
    fh.memlimit2=data[4]*256+data[5];

    data+=6;
    size-=6;

    //set the json string to parse
    fh.jsontext=string_view{
            reinterpret_cast<const char*>(
                data), size};
    try
    {
        switch(strategy) {
        case 0:
            fh.useDefault();
            break;
        case 1:
            fh.useMonotonic();
            break;
        case 2:
            fh.useLocalBuffer();
            break;
        case 3:
            fh.useDynLess();
            break;
        }
    }
    catch(...)
    {
    }
    return 0;
}