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| author | chriseth <chris@ethereum.org> | 2018-02-22 22:32:18 +0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-02-22 22:32:18 +0800 |
| commit | 7d87aed5d0768575438f7b3866c4b0c0b730251e (patch) | |
| tree | 8c51f0fadd23caf9689a7b18c69d23a084e598a7 | |
| parent | 8fc9535d43df26001f7b34488d073c06fc4fd358 (diff) | |
| parent | 2ada9683dd54a10f61816814e79f15860f8feb2e (diff) | |
| download | dexon-solidity-7d87aed5d0768575438f7b3866c4b0c0b730251e.tar.gz dexon-solidity-7d87aed5d0768575438f7b3866c4b0c0b730251e.tar.zst dexon-solidity-7d87aed5d0768575438f7b3866c4b0c0b730251e.zip | |
Merge pull request #3552 from ethereum/chriseth-patch-1
ABI: Clarify padding direction.
| -rw-r--r-- | docs/abi-spec.rst | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/docs/abi-spec.rst b/docs/abi-spec.rst index f249bbcd..07c8e0ce 100644 --- a/docs/abi-spec.rst +++ b/docs/abi-spec.rst @@ -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. |