Decommision src_common prior to reintroducing it for files common between eth and plugins

src/uint_common.h

@@ -0,0 +1,35 @@
+/*******************************************************************************
+ *   Ledger Ethereum App
+ *   (c) 2016-2019 Ledger
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ ********************************************************************************/
+
+// Adapted from https://github.com/calccrypto/uint256_t
+
+#ifndef _UINT_COMMON_H_
+#define _UINT_COMMON_H_
+
+#include <stdint.h>
+
+#define UPPER_P(x) x->elements[0]
+#define LOWER_P(x) x->elements[1]
+#define UPPER(x)   x.elements[0]
+#define LOWER(x)   x.elements[1]
+
+void write_u64_be(uint8_t *const buffer, uint64_t value);
+void read_u64_be(const uint8_t *const in, uint64_t *const out);
+uint64_t readUint64BE(const uint8_t *const buffer);
+void reverseString(char *const str, uint32_t length);
+
+#endif  //_UINT_COMMON_H_