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Array type #28

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Array type #28

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016fc15
Add logic to decode signed integer.
dingpl716 Oct 20, 2018
25a8d3d
Merge pull request #1 from ArcBlock/decode-int
dingpl716 Oct 20, 2018
6dc022d
Add code to handle the case where the input data is not enough long t…
dingpl716 Oct 28, 2018
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18 changes: 18 additions & 0 deletions lib/abi/type_decoder.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -168,6 +168,11 @@ defmodule ABI.TypeDecoder do
decode_uint(data, size_in_bits)
end

@spec decode_type(ABI.FunctionSelector.type(), binary()) :: {any(), binary()}
defp decode_type({:int, size_in_bits}, data) do
decode_int(data, size_in_bits)
end

defp decode_type(:address, data), do: decode_bytes(data, 20, :left)

defp decode_type(:bool, data) do
Expand Down Expand Up @@ -204,6 +209,11 @@ defmodule ABI.TypeDecoder do
decode_type({:array, type, element_count}, rest)
end

defp decode_type({:array, _type, element_count}, data)
when element_count * 32 > byte_size(data) do
raise("The input binary data is not long enough to use to decode the array.")
end

defp decode_type({:array, _type, 0}, data), do: {[], data}

defp decode_type({:array, type, element_count}, data) do
Expand Down Expand Up @@ -260,6 +270,14 @@ defmodule ABI.TypeDecoder do
{value, rest}
end

@spec decode_int(binary(), integer()) :: {integer(), binary()}
defp decode_int(data, size_in_bits) do
total_bit_size = size_in_bits + ExthCrypto.Math.mod(256 - size_in_bits, 256)
<<value::integer-signed-big-size(total_bit_size), rest::binary>> = data

{value, rest}
end

@spec decode_bytes(binary(), integer(), atom()) :: {binary(), binary()}
def decode_bytes(data, size_in_bytes, padding_direction) do
# TODO: Create `unright_pad` repo, err, add to `ExthCrypto.Math`
Expand Down