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Implement algorithm::hex_lower as lower-case alternative to algorithm::hex

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This commit is contained in:
Nigel Stewart
2016-01-31 19:08:45 +10:00
committed by Nigel Stewart
parent 205f5ff4bb
commit d558476f41
1 changed files with 76 additions and 28 deletions
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56
include/boost/algorithm/hex.hpp
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@ -54,12 +54,12 @@ namespace detail {
/// \cond DOXYGEN_HIDE
template <typename T, typename OutputIterator>
OutputIterator encode_one ( T val, OutputIterator out ) {
OutputIterator encode_one ( T val, OutputIterator out, const char * hexDigits ) {
const std::size_t num_hex_digits = 2 * sizeof ( T );
char res [ num_hex_digits ];
char *p = res + num_hex_digits;
for ( std::size_t i = 0; i < num_hex_digits; ++i, val >>= 4 )
*--p = "0123456789ABCDEF" [ val & 0x0F ];
*--p = hexDigits [ val & 0x0F ];
return std::copy ( res, res + num_hex_digits, out );
}
@ -148,7 +148,24 @@ template <typename InputIterator, typename OutputIterator>
typename boost::enable_if<boost::is_integral<typename detail::hex_iterator_traits<InputIterator>::value_type>, OutputIterator>::type
hex ( InputIterator first, InputIterator last, OutputIterator out ) {
for ( ; first != last; ++first )
out = detail::encode_one ( *first, out );
out = detail::encode_one ( *first, out, "0123456789ABCDEF" );
return out;
}
/// \fn hex_lower ( InputIterator first, InputIterator last, OutputIterator out )
/// \brief Converts a sequence of integral types into a lower case hexadecimal sequence of characters.
///
/// \param first The start of the input sequence
/// \param last One past the end of the input sequence
/// \param out An output iterator to the results into
/// \return The updated output iterator
/// \note Based on the MySQL function of the same name
template <typename InputIterator, typename OutputIterator>
typename boost::enable_if<boost::is_integral<typename detail::hex_iterator_traits<InputIterator>::value_type>, OutputIterator>::type
hex_lower ( InputIterator first, InputIterator last, OutputIterator out ) {
for ( ; first != last; ++first )
out = detail::encode_one ( *first, out, "0123456789abcdef" );
return out;
}
@ -164,10 +181,27 @@ template <typename T, typename OutputIterator>
typename boost::enable_if<boost::is_integral<T>, OutputIterator>::type
hex ( const T *ptr, OutputIterator out ) {
while ( *ptr )
out = detail::encode_one ( *ptr++, out );
out = detail::encode_one ( *ptr++, out, "0123456789ABCDEF" );
return out;
}
/// \fn hex_lower ( const T *ptr, OutputIterator out )
/// \brief Converts a sequence of integral types into a lower case hexadecimal sequence of characters.
///
/// \param ptr A pointer to a 0-terminated sequence of data.
/// \param out An output iterator to the results into
/// \return The updated output iterator
/// \note Based on the MySQL function of the same name
template <typename T, typename OutputIterator>
typename boost::enable_if<boost::is_integral<T>, OutputIterator>::type
hex_lower ( const T *ptr, OutputIterator out ) {
while ( *ptr )
out = detail::encode_one ( *ptr++, out, "0123456789abcdef" );
return out;
}
/// \fn hex ( const Range &r, OutputIterator out )
/// \brief Converts a sequence of integral types into a hexadecimal sequence of characters.
///
@ -182,6 +216,20 @@ hex ( const Range &r, OutputIterator out ) {
}
/// \fn hex_lower ( const Range &r, OutputIterator out )
/// \brief Converts a sequence of integral types into a lower case hexadecimal sequence of characters.
///
/// \param r The input range
/// \param out An output iterator to the results into
/// \return The updated output iterator
/// \note Based on the MySQL function of the same name
template <typename Range, typename OutputIterator>
typename boost::enable_if<boost::is_integral<typename detail::hex_iterator_traits<typename Range::iterator>::value_type>, OutputIterator>::type
hex_lower ( const Range &r, OutputIterator out ) {
return hex_lower (boost::begin(r), boost::end(r), out);
}
/// \fn unhex ( InputIterator first, InputIterator last, OutputIterator out )
/// \brief Converts a sequence of hexadecimal characters into a sequence of integers.
///