Diff: MaximInterfaceCore/HexString.cpp

Revision:

8:5ea891c7d1a1

Child:

10:947d3f44e0a0

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MaximInterfaceCore/HexString.cpp	Mon Sep 16 11:13:37 2019 -0500
@@ -0,0 +1,86 @@
+/*******************************************************************************
+* Copyright (C) Maxim Integrated Products, Inc., All Rights Reserved.
+*
+* Permission is hereby granted, free of charge, to any person obtaining a
+* copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,
+* and/or sell copies of the Software, and to permit persons to whom the
+* Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+* OTHER DEALINGS IN THE SOFTWARE.
+*
+* Except as contained in this notice, the name of Maxim Integrated
+* Products, Inc. shall not be used except as stated in the Maxim Integrated
+* Products, Inc. Branding Policy.
+*
+* The mere transfer of this software does not imply any licenses
+* of trade secrets, proprietary technology, copyrights, patents,
+* trademarks, maskwork rights, or any other form of intellectual
+* property whatsoever. Maxim Integrated Products, Inc. retains all
+* ownership rights.
+*******************************************************************************/
+
+#include <cctype>
+#include <cstdio>
+#include <cstdlib>
+#include "HexString.hpp"
+
+namespace MaximInterfaceCore {
+
+using std::string;
+using std::vector;
+
+static const int charsPerByte = 2;
+
+string toHexString(span<const uint_least8_t> byteArray) {
+  string hexString;
+  hexString.reserve(byteArray.size() * charsPerByte);
+  for (span<const uint_least8_t>::index_type i = 0; i < byteArray.size(); ++i) {
+    char hexBuf[charsPerByte + 1];
+    std::sprintf(hexBuf, "%2.2X", byteArray[i] & 0xFF);
+    hexString.append(hexBuf, charsPerByte);
+  }
+  return hexString;
+}
+
+Optional<vector<uint_least8_t> >
+fromHexString(const string & hexString) {
+  Optional<vector<uint_least8_t> > byteArray = vector<uint_least8_t>();
+  byteArray->reserve(hexString.size() / charsPerByte);
+  char hexBuf[charsPerByte + 1];
+  char * const hexBufEnd = hexBuf + charsPerByte;
+  *hexBufEnd = '\0';
+  char * hexBufIt = hexBuf;
+  for (string::const_iterator hexStringIt = hexString.begin(),
+                              hexStringEnd = hexString.end();
+       hexStringIt != hexStringEnd; ++hexStringIt) {
+    if (!std::isspace(*hexStringIt)) {
+      *hexBufIt = *hexStringIt;
+      if (++hexBufIt == hexBufEnd) {
+        char * hexBufParseEnd;
+        byteArray->push_back(static_cast<uint_least8_t>(
+            std::strtoul(hexBuf, &hexBufParseEnd, 16)));
+        if (hexBufParseEnd != hexBufEnd) {
+          break;
+        }
+        hexBufIt = hexBuf;
+      }
+    }
+  }
+  if (hexBufIt != hexBuf) {
+    byteArray.reset();
+  }
+  return byteArray;
+}
+
+} // namespace MaximInterfaceCore