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authorGreg Hysen <greg.hysen@gmail.com>2018-07-14 05:13:16 +0800
committerGreg Hysen <greg.hysen@gmail.com>2018-07-18 21:50:58 +0800
commit9f74feb3475b14ebdf2a0b312856fc927f91b6ab (patch)
tree111d36532509023603a81ff62d06bc086c0ae86b /packages/contracts/src/2.0.0
parente2fb49a8f871fd4b631bb01bb641c632b7c19435 (diff)
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Removed receiverData and `onReceive` callback from ERC721 proxy.
Diffstat (limited to 'packages/contracts/src/2.0.0')
-rw-r--r--packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol94
1 files changed, 21 insertions, 73 deletions
diff --git a/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol b/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol
index 1f9958b43..a56c41adb 100644
--- a/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol
+++ b/packages/contracts/src/2.0.0/protocol/AssetProxy/ERC721Proxy.sol
@@ -83,19 +83,15 @@ contract ERC721Proxy is
// WARNING: The ABIv2 specification allows additional padding between
// the Params and Data section. This will result in a larger
// offset to assetData.
-
+
// Asset data itself is encoded as follows:
//
// | Area | Offset | Length | Contents |
// |----------|--------|---------|-------------------------------------|
// | Header | 0 | 4 | function selector |
- // | Params | | 3 * 32 | function parameters: |
+ // | Params | | 2 * 32 | function parameters: |
// | | 4 | 12 + 20 | 1. token address |
// | | 36 | | 2. tokenId |
- // | | 68 | | 3. offset to receiverData (*) |
- // | Data | | | receiverData: |
- // | | 100 | 32 | receiverData Length |
- // | | 132 | ** | receiverData Contents |
// We construct calldata for the `token.safeTransferFrom` ABI.
// The layout of this calldata is in the table below.
@@ -103,14 +99,10 @@ contract ERC721Proxy is
// | Area | Offset | Length | Contents |
// |----------|--------|---------|-------------------------------------|
// | Header | 0 | 4 | function selector |
- // | Params | | 4 * 32 | function parameters: |
+ // | Params | | 3 * 32 | function parameters: |
// | | 4 | | 1. from |
// | | 36 | | 2. to |
// | | 68 | | 3. tokenId |
- // | | 100 | | 4. offset to receiverData (*) |
- // | Data | | | receiverData: |
- // | | 132 | 32 | receiverData Length |
- // | | 164 | ** | receiverData Contents |
// There exists only 1 of each token.
// require(amount == 1, "INVALID_AMOUNT")
@@ -122,76 +114,32 @@ contract ERC721Proxy is
mstore(96, 0)
revert(0, 100)
}
-
- // Require assetData to be at least 132 bytes
- let offset := calldataload(4)
- if lt(calldataload(add(offset, 4)), 132) {
- // Revert with `Error("LENGTH_GREATER_THAN_131_REQUIRED")`
- mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
- mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
- mstore(64, 0x000000204c454e4754485f475245415445525f5448414e5f3133315f52455155)
- mstore(96, 0x4952454400000000000000000000000000000000000000000000000000000000)
- revert(0, 100)
- }
-
- /////// Setup State ///////
- // `cdStart` is the start of the calldata for
- // `token.safeTransferFrom` (equal to free memory ptr).
- let cdStart := mload(64)
- // `dataAreaLength` is the total number of words
- // needed to store `receiverData`
- // As-per the ABI spec, this value is padded up to
- // the nearest multiple of 32,
- // and includes 32-bytes for length.
- // It's calculated as folows:
- // - Unpadded length in bytes = `mload(receiverData) + 32`
- // - Add 31 to convert rounding down to rounding up.
- // Combined with the previous and this is `63`.
- // - Round down to nearest multiple of 32 by clearing
- // bits 0x1F. This is done with `and` and a mask.
/////// Setup Header Area ///////
// This area holds the 4-byte `transferFromSelector`.
// Any trailing data in transferFromSelector will be
// overwritten in the next `mstore` call.
- mstore(cdStart, 0xb88d4fde00000000000000000000000000000000000000000000000000000000)
+ mstore(0, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
/////// Setup Params Area ///////
- // Each parameter is padded to 32-bytes.
- // The entire Params Area is 128 bytes.
- // Notes:
- // 1. A 20-byte mask is applied to addresses
- // to zero-out the unused bytes.
- // 2. The offset to `receiverData` is the length
- // of the Params Area (128 bytes).
-
- let length := calldataload(add(offset, 136))
- let token := calldataload(add(offset, 40))
-
- // Round length up to multiple of 32
- length := and(add(length, 31), 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE0)
-
- // Copy `from` and `to`
- calldatacopy(add(cdStart, 4), 36, 64)
-
- // TokenId
- mstore(add(cdStart, 68), calldataload(add(offset, 72)))
-
- // Offset to receiverData
- mstore(add(cdStart, 100), 128)
-
- // receiverData (including length)
- calldatacopy(add(cdStart, 132), add(offset, 136), add(length, 32))
-
- /////// Call `token.safeTransferFrom` using the calldata ///////
+ // We copy the fields `from` and `to` in bulk
+ // from our own calldata to the new calldata.
+ calldatacopy(4, 36, 64)
+
+ // Copy `tokenId` field from our own calldata to the new calldata.
+ let assetDataOffset := calldataload(4)
+ calldatacopy(68, add(assetDataOffset, 72), 32)
+
+ /////// Call `token.transferFrom` using the calldata ///////
+ let token := calldataload(add(assetDataOffset, 40))
let success := call(
- gas, // forward all gas
- token, // call address of token contract
- 0, // don't send any ETH
- cdStart, // pointer to start of input
- add(length, 164), // length of input
- 0, // write output to null
- 0 // output size is 0 bytes
+ gas, // forward all gas
+ token, // call address of token contract
+ 0, // don't send any ETH
+ 0, // pointer to start of input
+ 100, // length of input
+ 0, // write output to null
+ 0 // output size is 0 bytes
)
if success {
return(0, 0)