Merge pull request #10 from ethstorage/opblob

support optimism blob

contracts/BlobStorageManager.sol

@@ -5,7 +5,8 @@ import "@openzeppelin/contracts/access/Ownable.sol";
 
 enum DecodeType {
     RawData,
-    PaddingPer31Bytes
+    PaddingPer31Bytes,
+    OptimismCompact
 }
 
 interface IEthStorageContract {
@@ -84,7 +85,7 @@ contract BlobStorageManager is Ownable {
             return (new bytes(0), false);
         }
 
-        bytes memory data = storageContract.get(keyToChunks[key][chunkId], DecodeType.PaddingPer31Bytes, 0, length);
+        bytes memory data = storageContract.get(keyToChunks[key][chunkId], DecodeType.OptimismCompact, 0, length);
         return (data, true);
     }
 
@@ -99,7 +100,7 @@ contract BlobStorageManager is Ownable {
         for (uint256 chunkId = 0; chunkId < chunkNum; chunkId++) {
             bytes32 chunkKey = keyToChunks[key][chunkId];
             uint256 length = storageContract.size(chunkKey);
-            storageContract.get(chunkKey, DecodeType.PaddingPer31Bytes, 0, length);
+            storageContract.get(chunkKey, DecodeType.OptimismCompact, 0, length);
 
             assembly {
                 returndatacopy(add(add(concatenatedData, offset), 0x20), 0x40, length)

contracts/ERC5018.sol

@@ -4,8 +4,9 @@ pragma solidity ^0.8.0;
 import "./IERC5018.sol";
 import "./LargeStorageManager.sol";
 import "./BlobStorageManager.sol";
+import "./ISemver.sol";
 
-contract ERC5018 is IERC5018, LargeStorageManager, BlobStorageManager {
+contract ERC5018 is LargeStorageManager, BlobStorageManager, IERC5018, ISemver {
 
     enum StorageMode {
         Uninitialized,
@@ -20,6 +21,12 @@ contract ERC5018 is IERC5018, LargeStorageManager, BlobStorageManager {
         address storageAddress
     ) LargeStorageManager(slotLimit) BlobStorageManager(maxChunkSize, storageAddress) {}
 
+    /// @notice Semantic version.
+    /// @custom:semver 1.0.0
+    function version() public pure virtual returns (string memory) {
+        return "1.0.0";
+    }
+
     function getStorageMode(bytes memory name) public view returns (StorageMode) {
         return storageModes[keccak256(name)];
     }

contracts/ISemver.sol

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+/// @title ISemver
+/// @notice ISemver is a simple contract for ensuring that contracts are
+///         versioned using semantic versioning.
+interface ISemver {
+    /// @notice Getter for the semantic version of the contract. This is not
+    ///         meant to be used onchain but instead meant to be used by offchain
+    ///         tooling.
+    /// @return Semver contract version as a string.
+    function version() external view returns (string memory);
+}