Invalid value for negative int from eth_call

[wafcio]

Invalid value for negative int from eth_call

[wafcio]

Bug found, solution:

In line https://github.com/q9f/eth.rb/blob/main/lib/eth/abi/decoder.rb#L109

i = u >= 2 ** (type.sub_type.to_i - 1) ? (u - 2 ** type.sub_type.to_i) : u

gem removes 111..111 mask of datatype size. Unfortunately from RPC each value is saved on 256 bits, so it should look like this:

i = u >= 2 ** (type.sub_type.to_i - 1) ? (u - 2 ** 256) : u

[q9f]

Thanks for reporting. Unfortunately, the ABI submodule is 8 years old, and I'm currently in the process of rewriting this completely.

I might be able to publish a test case and a patch for this bug meanwhile. Stay tuned.

there is also another test case failing currently in https://github.com/q9f/eth.rb/blob/main/spec/eth/abi_spec.rb#L354