/*
 * Spdylay - SPDY Library
 *
 * Copyright (c) 2012 Tatsuhiro Tsujikawa
 *
 * 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.
 */
#include "util.h"

#include <cstdio>

namespace spdylay {

namespace util {

const std::string DEFAULT_STRIP_CHARSET("\r\n\t ");

bool isAlpha(const char c)
{
  return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z');
}

bool isDigit(const char c)
{
  return '0' <= c && c <= '9';
}

bool isHexDigit(const char c)
{
  return isDigit(c) || ('A' <= c && c <= 'F') || ('a' <= c && c <= 'f');
}

bool inRFC3986UnreservedChars(const char c)
{
  static const char unreserved[] = { '-', '.', '_', '~' };
  return isAlpha(c) || isDigit(c) ||
    std::find(&unreserved[0], &unreserved[4], c) != &unreserved[4];
}

std::string percentEncode(const unsigned char* target, size_t len)
{
  std::string dest;
  for(size_t i = 0; i < len; ++i) {
    if(inRFC3986UnreservedChars(target[i])) {
      dest += target[i];
    } else {
      char temp[4];
      snprintf(temp, sizeof(temp), "%%%02X", target[i]);
      dest.append(temp);
      //dest.append(fmt("%%%02X", target[i]));
    }
  }
  return dest;
}

std::string percentEncode(const std::string& target)
{
  return percentEncode(reinterpret_cast<const unsigned char*>(target.c_str()),
                       target.size());
}

std::string percentDecode
(std::string::const_iterator first, std::string::const_iterator last)
{
  std::string result;
  for(; first != last; ++first) {
    if(*first == '%') {
      if(first+1 != last && first+2 != last &&
         isHexDigit(*(first+1)) && isHexDigit(*(first+2))) {
        std::string numstr(first+1, first+3);
        result += strtol(numstr.c_str(), 0, 16);
        first += 2;
      } else {
        result += *first;
      }
    } else {
      result += *first;
    }
  }
  return result;
}

} // namespace util

} // namespace spdylay