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/**
* Copyright (C) 2015 Topology LP
* 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
* THE AUTHORS OR COPYRIGHT HOLDERS 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.
*/
#ifndef CPPCODEC_PARSE_ERROR
#define CPPCODEC_PARSE_ERROR
#include <stdexcept>
#include <string>
namespace cppcodec {
namespace detail {
// <*stream> headers include a lot of code and noticeably increase compile times.
// The only thing we want from them really is a char-to-string conversion.
// That's easy to implement with many less lines of code, so let's do it ourselves.
template <int N>
static void uctoa(unsigned char n, char (&s)[N])
{
static_assert(N >= 4, "need at least 4 bytes to convert an unsigned char to string safely");
int i = sizeof(s) - 1;
int num_chars = 1;
s[i--] = '\0';
do { // generate digits in reverse order
s[i--] = n % 10 + '0'; // get next digit
++num_chars;
} while ((n /= 10) > 0); // delete it
if (num_chars == sizeof(s)) {
return;
}
for (i = 0; i < num_chars; ++i) { // move chars to front of string
s[i] = s[i + (sizeof(s) - num_chars)];
}
}
} // end namespace detail
class parse_error : public std::domain_error
{
public:
using std::domain_error::domain_error;
};
// Avoids memory allocation, so it can be used in constexpr functions.
class symbol_error : public parse_error
{
public:
symbol_error(char c)
: parse_error(symbol_error::make_error_message(c))
, m_symbol(c)
{
}
symbol_error(const symbol_error&) = default;
char symbol() const noexcept { return m_symbol; }
private:
static std::string make_error_message(char c)
{
char s[4];
detail::uctoa(*reinterpret_cast<unsigned char*>(&c), s);
return std::string("parse error: character [") + &(s[0]) + " '" + c + "'] out of bounds";
}
private:
char m_symbol;
};
class invalid_input_length : public parse_error
{
public:
using parse_error::parse_error;
};
class padding_error : public invalid_input_length
{
public:
padding_error()
: invalid_input_length("parse error: codec expects padded input string but padding was invalid")
{
}
padding_error(const padding_error&) = default;
};
} // namespace cppcodec
#endif // CPPCODEC_PARSE_ERROR
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