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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
parent a09963bf93
commit cc1392cae6
1 changed files with 76 additions and 28 deletions
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104
include/boost/algorithm/hex.hpp
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@ -1,9 +1,9 @@
/*
/*
Copyright (c) Marshall Clow 2011-2012.
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Thanks to Nevin for his comments/help.
*/
@ -13,7 +13,7 @@
*/
/// \file hex.hpp
/// \brief Convert sequence of integral types into a sequence of hexadecimal
/// \brief Convert sequence of integral types into a sequence of hexadecimal
/// characters and back. Based on the MySQL functions HEX and UNHEX
/// \author Marshall Clow
@ -33,17 +33,17 @@
namespace boost { namespace algorithm {
/*!
\struct hex_decode_error
\brief Base exception class for all hex decoding errors
/*!
\struct hex_decode_error
\brief Base exception class for all hex decoding errors
*/ /*!
\struct non_hex_input
\struct non_hex_input
\brief Thrown when a non-hex value (0-9, A-F) encountered when decoding.
Contains the offending character
*/ /*!
\struct not_enough_input
*/ /*!
\struct not_enough_input
\brief Thrown when the input sequence unexpectedly ends
*/
struct hex_decode_error : virtual boost::exception, virtual std::exception {};
struct not_enough_input : virtual hex_decode_error {};
@ -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 );
}
@ -106,12 +106,12 @@ namespace detail {
typedef T value_type;
};
template <typename Iterator>
template <typename Iterator>
bool iter_end ( Iterator current, Iterator last ) { return current == last; }
template <typename T>
bool ptr_end ( const T* ptr, const T* /*end*/ ) { return *ptr == '\0'; }
// What can we assume here about the inputs?
// is std::iterator_traits<InputIterator>::value_type always 'char' ?
// Could it be wchar_t, say? Does it matter?
@ -124,11 +124,11 @@ namespace detail {
// Need to make sure that we get can read that many chars here.
for ( std::size_t i = 0; i < 2 * sizeof ( T ); ++i, ++first ) {
if ( pred ( first, last ))
if ( pred ( first, last ))
BOOST_THROW_EXCEPTION (not_enough_input ());
res = ( 16 * res ) + hex_char_to_int (*first);
}
*out = res;
return ++out;
}
@ -138,7 +138,7 @@ namespace detail {
/// \fn hex ( InputIterator first, InputIterator last, OutputIterator out )
/// \brief Converts a sequence of integral types into a 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
@ -148,14 +148,31 @@ 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;
}
/// \fn hex ( const T *ptr, OutputIterator out )
/// \brief Converts a sequence of integral types into a 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
@ -164,13 +181,30 @@ 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.
///
///
/// \param r The input range
/// \param out An output iterator to the results into
/// \return The updated output iterator
@ -182,9 +216,23 @@ 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.
///
///
/// \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
@ -200,7 +248,7 @@ OutputIterator unhex ( InputIterator first, InputIterator last, OutputIterator o
/// \fn unhex ( const T *ptr, OutputIterator out )
/// \brief Converts a sequence of hexadecimal characters into a sequence of integers.
///
///
/// \param ptr A pointer to a null-terminated input sequence.
/// \param out An output iterator to the results into
/// \return The updated output iterator
@ -218,7 +266,7 @@ OutputIterator unhex ( const T *ptr, OutputIterator out ) {
/// \fn OutputIterator unhex ( const Range &r, OutputIterator out )
/// \brief Converts a sequence of hexadecimal characters into a sequence of integers.
///
///
/// \param r The input range
/// \param out An output iterator to the results into
/// \return The updated output iterator
@ -231,7 +279,7 @@ OutputIterator unhex ( const Range &r, OutputIterator out ) {
/// \fn String hex ( const String &input )
/// \brief Converts a sequence of integral types into a hexadecimal sequence of characters.
///
///
/// \param input A container to be converted
/// \return A container with the encoded text
template<typename String>
@ -244,7 +292,7 @@ String hex ( const String &input ) {
/// \fn String unhex ( const String &input )
/// \brief Converts a sequence of hexadecimal characters into a sequence of characters.
///
///
/// \param input A container to be converted
/// \return A container with the decoded text
template<typename String>