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/*
  This file is part of libmicrohttpd
  Copyright (C) 2015 Karlson2k (Evgeny Grin)

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

/**
 * @file microhttpd/mhd_str.c
 * @brief  Functions implementations for string manipulating
 * @author Karlson2k (Evgeny Grin)
 */

#include "mhd_str.h"

#include "MHD_config.h"

#ifdef HAVE_STDBOOL_H
#include <stdbool.h>
#endif

#include "mhd_limits.h"

/*
 * Block of functions/macros that use US-ASCII charset as required by HTTP
 * standards. Not affected by current locale settings.
 */

#ifdef INLINE_FUNC
/**
 * Check whether character is lower case letter in US-ASCII
 * @param c character to check
 * @return non-zero if character is lower case letter, zero otherwise
 */
_MHD_inline _MHD_bool
isasciilower (char c)
{
  return c >= 'a' && c <= 'z';
}

/**
 * Check whether character is upper case letter in US-ASCII
 * @param c character to check
 * @return non-zero if character is upper case letter, zero otherwise
 */
_MHD_inline _MHD_bool
isasciiupper (char c)
{
  return c >= 'A' && c <= 'Z';
}

/**
 * Check whether character is letter in US-ASCII
 * @param c character to check
 * @return non-zero if character is letter in US-ASCII, zero otherwise
 */
_MHD_inline _MHD_bool
isasciialpha (char c)
{
  return isasciilower (c) || isasciiupper (c);
}

/**
 * Check whether character is decimal digit in US-ASCII
 * @param c character to check
 * @return non-zero if character is decimal digit, zero otherwise
 */
_MHD_inline _MHD_bool
isasciidigit (char c)
{
  return c >= '0' && c <= '9';
}

/**
 * Check whether character is hexadecimal digit in US-ASCII
 * @param c character to check
 * @return non-zero if character is decimal digit, zero otherwise
 */
_MHD_inline _MHD_bool
isasciixdigit (char c)
{
  return isasciidigit (c) ||
         (c >= 'A' && c <= 'F') ||
         (c >= 'a' && c <= 'f');
}

/**
 * Check whether character is decimal digit or letter in US-ASCII
 * @param c character to check
 * @return non-zero if character is decimal digit or letter, zero otherwise
 */
_MHD_inline _MHD_bool
isasciialmun (char c)
{
  return isasciialpha (c) || isasciidigit (c);
}

/**
 * Convert US-ASCII character to lower case.
 * If character is upper case letter in US-ASCII than it's converted to lower
 * case analog. If character is NOT upper case letter than it's returned
 * unmodified.
 * @param c character to convert
 * @return converted to lower case character
 */
_MHD_inline char
toasciilower (char c)
{
  return isasciiupper (c) ? (c - 'A' + 'a') : c;
}

/**
 * Convert US-ASCII character to upper case.
 * If character is lower case letter in US-ASCII than it's converted to upper
 * case analog. If character is NOT lower case letter than it's returned
 * unmodified.
 * @param c character to convert
 * @return converted to upper case character
 */
_MHD_inline char
toasciiupper (char c)
{
  return isasciilower (c) ? (c - 'a' + 'A') : c;
}

/**
 * Convert US-ASCII hexadecimal digit to its value.
 * @param c character to convert
 * @return value of hexadecimal digit or -1 if @ c is not hexadecimal digit
 */
_MHD_inline int
toxdigitvalue (char c)
{
  if (isasciidigit (c))
    return (unsigned char)(c - '0');
  if (c >= 'A' && c <= 'F')
    return (unsigned char)(c - 'A' + 10);
  if (c >= 'a' && c <= 'f')
    return (unsigned char)(c - 'a' + 10);

  return -1;
}
#else  /* !INLINE_FUNC */

/**
 * Checks whether character is lower case letter in US-ASCII
 * @param c character to check
 * @return boolean true if character is lower case letter,
 *         boolean false otherwise
 */
#define isasciilower(c) (((char)(c)) >= 'a' && ((char)(c)) <= 'z')

/**
 * Checks whether character is upper case letter in US-ASCII
 * @param c character to check
 * @return boolean true if character is upper case letter,
 *         boolean false otherwise
 */
#define isasciiupper(c) (((char)(c)) >= 'A' && ((char)(c)) <= 'Z')

/**
 * Checks whether character is letter in US-ASCII
 * @param c character to check
 * @return boolean true if character is letter, boolean false
 *         otherwise
 */
#define isasciialpha(c) (isasciilower(c) || isasciiupper(c))

/**
 * Check whether character is decimal digit in US-ASCII
 * @param c character to check
 * @return boolean true if character is decimal digit, boolean false
 *         otherwise
 */
#define isasciidigit(c) (((char)(c)) >= '0' && ((char)(c)) <= '9')

/**
 * Check whether character is hexadecimal digit in US-ASCII
 * @param c character to check
 * @return boolean true if character is hexadecimal digit,
 *         boolean false otherwise
 */
#define isasciixdigit(c) (isasciidigit((c)) || \
                          (((char)(c)) >= 'A' && ((char)(c)) <= 'F') || \
                          (((char)(c)) >= 'a' && ((char)(c)) <= 'f') )

/**
 * Check whether character is decimal digit or letter in US-ASCII
 * @param c character to check
 * @return boolean true if character is decimal digit or letter,
 *         boolean false otherwise
 */
#define isasciialmun(c) (isasciialpha(c) || isasciidigit(c))

/**
 * Convert US-ASCII character to lower case.
 * If character is upper case letter in US-ASCII than it's converted to lower
 * case analog. If character is NOT upper case letter than it's returned
 * unmodified.
 * @param c character to convert
 * @return converted to lower case character
 */
#define toasciilower(c) ((isasciiupper(c)) ? (((char)(c)) - 'A' + 'a') : ((char)(c)))

/**
 * Convert US-ASCII character to upper case.
 * If character is lower case letter in US-ASCII than it's converted to upper
 * case analog. If character is NOT lower case letter than it's returned
 * unmodified.
 * @param c character to convert
 * @return converted to upper case character
 */
#define toasciiupper(c) ((isasciilower(c)) ? (((char)(c)) - 'a' + 'A') : ((char)(c)))

/**
 * Convert US-ASCII hexadecimal digit to its value.
 * @param c character to convert
 * @return value of hexadecimal digit or -1 if @ c is not hexadecimal digit
 */
#define toxdigitvalue(c) ( isasciidigit(c) ? (int)(((char)(c)) - '0') : \
                           ( (((char)(c)) >= 'A' && ((char)(c)) <= 'F') ? \
                             (int)(((unsigned char)(c)) - 'A' + 10) : \
                             ( (((char)(c)) >= 'a' && ((char)(c)) <= 'f') ? \
                               (int)(((unsigned char)(c)) - 'a' + 10) : (int)(-1) )))
#endif /* !INLINE_FUNC */

/**
 * Check two string for equality, ignoring case of US-ASCII letters.
 * @param str1 first string to compare
 * @param str2 second string to compare
 * @return non-zero if two strings are equal, zero otherwise.
 */
int
MHD_str_equal_caseless_ (const char * str1, const char * str2)
{
  while (0 != (*str1))
    {
      const char c1 = *str1;
      const char c2 = *str2;
      if (c1 != c2 && toasciilower (c1) != toasciilower (c2))
        return 0;
      str1++;
      str2++;
    }
  return 0 == (*str2);
}


/**
 * Check two string for equality, ignoring case of US-ASCII letters and
 * checking not more than @a maxlen characters.
 * Compares up to first terminating null character, but not more than
 * first @a maxlen characters.
 * @param str1 first string to compare
 * @param str2 second string to compare
 * @param maxlen maximum number of characters to compare
 * @return non-zero if two strings are equal, zero otherwise.
 */
int
MHD_str_equal_caseless_n_ (const char * const str1, const char * const str2, size_t maxlen)
{
  for (size_t i = 0; i < maxlen; ++i)
    {
      const char c1 = str1[i];
      const char c2 = str2[i];
      if (0 == c2)
        return 0 == c1;
      if (c1 != c2 && toasciilower (c1) != toasciilower (c2))
        return 0;
    }
  return !0;
}

/**
 * Convert decimal US-ASCII digits in string to number in uint64_t.
 * Conversion stopped at first non-digit character.
 * @param str string to convert
 * @param out_val pointer to uint64_t to store result of conversion
 * @return non-zero number of characters processed on succeed,
 *         zero if no digit is found, resulting value is larger
 *         then possible to store in uint64_t or @a out_val is NULL
 */
size_t 
MHD_str_to_uint64_ (const char * str, uint64_t * out_val)
{
  const char * const start = str;
  uint64_t res;
  if (!str || !out_val || !isasciidigit(str[0]))
    return 0;

  res = 0;
  do
    {
      const int digit = (unsigned char)(*str) - '0';
      if ( (res > (UINT64_MAX / 10)) ||
           (res == (UINT64_MAX / 10) && digit > (UINT64_MAX % 10)) )
        return 0;

      res *= 10;
      res += digit;
      str++;
    } while (isasciidigit (*str));

  *out_val = res;
  return str - start;
}


/**
 * Convert not more then @a maxlen decimal US-ASCII digits in string to
 * number in uint64_t.
 * Conversion stopped at first non-digit character or after @a maxlen 
 * digits.
 * @param str string to convert
 * @param maxlen maximum number of characters to process
 * @param out_val pointer to uint64_t to store result of conversion
 * @return non-zero number of characters processed on succeed,
 *         zero if no digit is found, resulting value is larger
 *         then possible to store in uint64_t or @a out_val is NULL
 */
size_t
MHD_str_to_uint64_n_ (const char * str, size_t maxlen, uint64_t * out_val)
{
  uint64_t res;
  size_t i;
  if (!str || !maxlen || !out_val || !isasciidigit (str[0]))
    return 0;

  res = 0;
  i = 0;
  do
    {
      const int digit = (unsigned char)str[i] - '0';
      if ( (res > (UINT64_MAX / 10)) ||
           (res == (UINT64_MAX / 10) && digit > (UINT64_MAX % 10)) )
        return 0;

      res *= 10;
      res += digit;
      i++;      
    } while(i < maxlen && isasciidigit(str[i]));

  *out_val= res;
  return i;
}


/**
 * Convert hexadecimal US-ASCII digits in string to number in size_t.
 * Conversion stopped at first non-digit character.
 * @param str string to convert
 * @param out_val pointer to size_t to store result of conversion
 * @return non-zero number of characters processed on succeed, 
 *         zero if no digit is found, resulting value is larger
 *         then possible to store in size_t or @a out_val is NULL
 */
size_t
MHD_strx_to_sizet_ (const char * str, size_t * out_val)
{
  const char * const start = str;
  size_t res;
  int digit;
  if (!str || !out_val)
    return 0;

  res = 0;
  digit = toxdigitvalue (*str);
  while (digit >= 0)
    {
      if ( (res < (SIZE_MAX / 16)) ||
           (res == (SIZE_MAX / 16) && digit <= (SIZE_MAX % 16)) )
        {
          res *= 16;
          res += digit;
        }
      else
        return 0;
      str++;
      digit = toxdigitvalue (*str);
    }

  if (str - start > 0)
    *out_val = res;
  return str - start;
}


/**
 * Convert not more then @a maxlen hexadecimal US-ASCII digits in string
 * to number in size_t.
 * Conversion stopped at first non-digit character or after @a maxlen 
 * digits.
 * @param str string to convert
 * @param maxlen maximum number of characters to process
 * @param out_val pointer to size_t to store result of conversion
 * @param next_char pointer to store pointer to character next to last
 *                  converted digit, ignored if NULL
 * @return non-zero number of characters processed on succeed,
 *         zero if no digit is found, resulting value is larger
 *         then possible to store in size_t or @a out_val is NULL
 */
size_t
MHD_strx_to_sizet_n_ (const char * str, size_t maxlen, size_t * out_val)
{
  size_t i;
  size_t res;
  int digit;
  if (!str || !out_val)
    return 0;
  
  res = 0;
  i = 0;
  while (i < maxlen && (digit = toxdigitvalue (str[i])) >= 0)
    {
      if ( (res > (SIZE_MAX / 16)) ||
           (res == (SIZE_MAX / 16) && digit > (SIZE_MAX % 16)) )
        return 0;

      res *= 16;
      res += digit;
      i++;
    }

  if (i)
    *out_val = res;
  return i;
}