Create a Math Library to Combine Pyth Prices in Solidity

target_chains/ethereum/sdk/rust/PythUtilis.rs

@@ -0,0 +1,34 @@
+pragma solidity ^0.8.0;
+
+library PythUtils {
+    /// @notice Converts a Pyth price to a uint256 with a target number of decimals
+    /// @param price The Pyth price
+    /// @param expo The Pyth price exponent
+    /// @param targetDecimals The target number of decimals
+    /// @return The price as a uint256
+    /// @dev Function will lose precision if targetDecimals is less than the Pyth price decimals.
+    /// This method will truncate any digits that cannot be represented by the targetDecimals.
+    /// e.g. If the price is 0.000123 and the targetDecimals is 2, the result will be 0
+
+    function convertToUint(
+        int256 price,
+        int32 expo,
+        uint8 targetDecimals
+    ) internal pure returns (uint256) {
+        if (price < 0 || expo > 0 || expo < -255) {
+            revert();
+        }
+
+        uint8 priceDecimals = uint8(uint32(-1 * expo));
+
+        if (targetDecimals >= priceDecimals) {
+            return
+                uint(uint256(price)) *
+                10 ** uint32(targetDecimals - priceDecimals);
+        } else {
+            return
+                uint(uint256(price)) /
+                10 ** uint32(priceDecimals - targetDecimals);
+        }
+    }
+}

target_chains/ethereum/sdk/solidity/PythUtils.sol

@@ -31,4 +31,4 @@ library PythUtils {
                 10 ** uint32(priceDecimals - targetDecimals);
         }
     }
-}
+}