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Merge pull request #3552 from ethereum/chriseth-patch-1

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ABI: Clarify padding direction.
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chriseth 2018-02-22 15:32:18 +01:00 committed by GitHub
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@ -155,15 +155,15 @@ on the type of ``X`` being
``enc(X) = enc(enc_utf8(X))``, i.e. ``X`` is utf-8 encoded and this value is interpreted as of ``bytes`` type and encoded further. Note that the length used in this subsequent encoding is the number of bytes of the utf-8 encoded string, not its number of characters.
- ``uint<M>``: ``enc(X)`` is the big-endian encoding of ``X``, padded on the higher-order (left) side with zero-bytes such that the length is a multiple of 32 bytes.
- ``uint<M>``: ``enc(X)`` is the big-endian encoding of ``X``, padded on the higher-order (left) side with zero-bytes such that the length is 32 bytes.
- ``address``: as in the ``uint160`` case
- ``int<M>``: ``enc(X)`` is the big-endian two's complement encoding of ``X``, padded on the higher-order (left) side with ``0xff`` for negative ``X`` and with zero bytes for positive ``X`` such that the length is a multiple of 32 bytes.
- ``int<M>``: ``enc(X)`` is the big-endian two's complement encoding of ``X``, padded on the higher-order (left) side with ``0xff`` for negative ``X`` and with zero bytes for positive ``X`` such that the length is 32 bytes.
- ``bool``: as in the ``uint8`` case, where ``1`` is used for ``true`` and ``0`` for ``false``
- ``fixed<M>x<N>``: ``enc(X)`` is ``enc(X * 10**N)`` where ``X * 10**N`` is interpreted as a ``int256``.
- ``fixed``: as in the ``fixed128x19`` case
- ``ufixed<M>x<N>``: ``enc(X)`` is ``enc(X * 10**N)`` where ``X * 10**N`` is interpreted as a ``uint256``.
- ``ufixed``: as in the ``ufixed128x19`` case
- ``bytes<M>``: ``enc(X)`` is the sequence of bytes in ``X`` padded with zero-bytes to a length of 32.
- ``bytes<M>``: ``enc(X)`` is the sequence of bytes in ``X`` padded with trailing zero-bytes to a length of 32 bytes.
Note that for any ``X``, ``len(enc(X))`` is a multiple of 32.