Crash processing a simple vector of int [TS] v=2.0.4

[leanmendoza]

Hey, I'm having a reproducible trouble when I build a vector of int and then I try to read it. I don't understand if I'm doing something wrong of if it's a builder problem, because the the reader it seems to work fine with other buffer generated in C++.

   const fbb = builder()
    fbb.startVector()
    fbb.addInt(50)
    fbb.addInt(51)
    fbb.addInt(52)
    fbb.addInt(53)
    fbb.end()

    const serializedBuffer = fbb.finish()
// At this point serializedBuffer is Uint8Array(7) [50, 51, 52, 53, 4, 88, 1]

    const ref = toReference(serializedBuffer.buffer)
    console.log(ref.length()).toBe(4)
    console.log(ref.get(0).intValue()) // prints 50
    console.log(ref.get(1).intValue()) // prints 51
    console.log(ref.get(2).intValue()) // prints 52
    console.log(ref.get(3).intValue()) // CRASH HERE (should print 53)

The crash detail:

Trying a similar code in C++ it works fine

    flexbuffers::Builder fbb;

    fbb.Vector([&]() {

        fbb.Int(50);
        fbb.Int(51);
        fbb.Int(52);
        fbb.Int(53);
    });

    fbb.Finish();

    const std::vector<uint8_t> buffer = fbb.GetBuffer();
    print_buffer(buffer);
// This print the following vector: [4 50 51 52 53 4 4 4 4 8 40 1]

And if I try to parse this buffer it works fine in typescript

    const cppSerializedBuffer = new UInt8Array([4, 50, 51, 52, 53, 4, 4, 4, 4, 8, 40, 1])
    const ref = toReference(cppSerializedBuffer.buffer)
    console.log(ref.length()).toBe(4)
    console.log(ref.get(0).intValue()) // prints 50
    console.log(ref.get(1).intValue()) // prints 51
    console.log(ref.get(2).intValue()) // prints 52
    console.log(ref.get(3).intValue()) // prints 53
// works fine, and it doesn't crash

[dbaileychess]

Thanks for the report.

@bjornharrtell Can you take a look?

[gonpombo8]

any news on this ? @dbaileychess
Thanks in advance 😄

[gonpombo8]

😢 @bjornharrtell @dbaileychess

[bjornharrtell]

I don't think I've used the one element at a time API, perhaps that is why I've not been hit by this problem.

[dbaileychess]

Sorry, I haven't use TS or flexbuffers myself, so I didn't investigate this.

// At this point serializedBuffer is Uint8Array(7) [50, 51, 52, 53, 4, 88, 1]

Shouldn't there be a 4 as the first item in the TS case? And it is missing the rest of the type values (4) for items 51, 52 and 53. So there appears to be some issue with the flexbuffer builder addInt()

[bjornharrtell]

Ah didn't notice it was flexbuffers.. that is also a part I have never used. 😬

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