HexString.cpp

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00032 
00033 #include <cctype>
00034 #include <cstdio>
00035 #include <cstdlib>
00036 #include "HexString.hpp"
00037 
00038 namespace MaximInterfaceCore {
00039 
00040 static const int charsPerByte = 2;
00041 
00042 std::string toHexString(span<const uint_least8_t> byteArray) {
00043   std::string hexString;
00044   hexString.reserve(byteArray.size() * charsPerByte);
00045   for (span<const uint_least8_t>::index_type i = 0; i < byteArray.size(); ++i) {
00046     char hexBuf[charsPerByte + 1];
00047     std::sprintf(hexBuf, "%2.2X", byteArray[i] & 0xFF);
00048     hexString.append(hexBuf, charsPerByte);
00049   }
00050   return hexString;
00051 }
00052 
00053 Optional<std::vector<uint_least8_t> >
00054 fromHexString(span<const char> hexString) {
00055   Optional<std::vector<uint_least8_t> > byteArray =
00056       std::vector<uint_least8_t>();
00057   byteArray->reserve(hexString.size() / charsPerByte);
00058   char hexBuf[charsPerByte + 1];
00059   char * const hexBufEnd = hexBuf + charsPerByte;
00060   *hexBufEnd = '\0';
00061   char * hexBufIt = hexBuf;
00062   for (span<const char>::iterator hexStringIt = hexString.begin(),
00063                                   hexStringEnd = hexString.end();
00064        hexStringIt != hexStringEnd; ++hexStringIt) {
00065     if (!(std::isspace(*hexStringIt) || *hexStringIt == '\0')) {
00066       *hexBufIt = *hexStringIt;
00067       if (++hexBufIt == hexBufEnd) {
00068         char * hexBufParseEnd;
00069         byteArray->push_back(static_cast<uint_least8_t>(
00070             std::strtoul(hexBuf, &hexBufParseEnd, 16)));
00071         if (hexBufParseEnd != hexBufEnd) {
00072           break;
00073         }
00074         hexBufIt = hexBuf;
00075       }
00076     }
00077   }
00078   if (hexBufIt != hexBuf) {
00079     byteArray.reset();
00080   }
00081   return byteArray;
00082 }
00083 
00084 } // namespace MaximInterfaceCore