feat: add address abi decoding

src/abi/abiDecode.cpp

@@ -121,3 +121,14 @@ ResultCode iotex::abi::decode::decodeString(const char* pData, size_t size, Iote
 
 	return ResultCode::SUCCESS;
 }
+
+iotex::ResultCode iotex::abi::decode::decodeAddress(const char data[64], char out[ETH_ADDRESS_C_STRING_SIZE])
+{
+	// The address is encoded as a uint160
+	// Ie. big-endian encoding padded on the higher-order (left) side with zero-bytes such that the length is 32 bytes.
+	out[ETH_ADDRESS_C_STRING_SIZE-1] = 0;
+	const char* pStart = data + 24;	// 12 padding bytes
+	memcpy(out, pStart, ETH_ADDRESS_C_STRING_SIZE - 1);
+
+	return ResultCode::SUCCESS;
+}

src/abi/abiDecode.h

@@ -90,6 +90,7 @@ bool decodeBool(const char data[64]);
 iotex::ResultCode decodeUintGeneric(const char* pData, size_t uintSize, uint64_t* out);
 iotex::ResultCode decodeIntGeneric(const char* pData, size_t uintSize, int64_t* out);
 iotex::ResultCode decodeString(const char* pData, size_t size, IotexString& out);
+iotex::ResultCode decodeAddress(const char data[64], char out[ETH_ADDRESS_C_STRING_SIZE]);
 
 template<uint8_t size>
 ResultCode decodeUint(const char* pData, size_t dataSize, uint64_t* out)

tests/CMakeLists.txt

@@ -42,6 +42,8 @@ set (IOTEX_UNIT_TESTS_SOURCES
     src/abi/abiTests.cpp
     src/abi/decode/abiDecodeUintTests.cpp
     src/abi/decode/abiDecodeIntTests.cpp
+    src/abi/decode/abiDecodeStringTests.cpp
+    src/abi/decode/abiDecodeAddressTests.cpp
     src/contract/contractTests.cpp
     src/contract/xrc20ContractTests.cpp
     src/account/accountTests_Execution.cpp

tests/src/abi/decode/abiDecodeAddressTests.cpp

@@ -0,0 +1,27 @@
+#include <gtest/gtest.h>
+#include <gmock/gmock.h>
+
+#include "abi/abiDecode.h"
+#include "contract/contract.h"
+#include "signer/signer.h"
+
+using namespace std;
+using namespace testing;
+using namespace iotex;
+using namespace iotex::abi::decode;
+
+class AbiDecodeAddressTests : public Test
+{
+    void SetUp() override {}
+
+    void TearDown() override {}
+};
+
+TEST_F(AbiDecodeAddressTests, DecodesCorrectly)
+{
+    const char encoded[] = "00000000000000000000000019e7e376e7c213b7e7e7e46cc70a5dd086daff2a";
+    char decoded[ETH_ADDRESS_C_STRING_SIZE];
+    ResultCode res = decodeAddress(encoded, decoded);
+    ASSERT_EQ(ResultCode::SUCCESS, res);
+    ASSERT_STREQ("19e7e376e7c213b7e7e7e46cc70a5dd086daff2a", decoded);
+}