/*
* Copyright (c) 2014, Tuan PM
* Email: tuanpm@live.com
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "utils.h"


uint8_t ICACHE_FLASH_ATTR UTILS_IsIPV4 (int8_t *str)
{
	uint8_t segs = 0;   /* Segment count. */
	uint8_t chcnt = 0;  /* Character count within segment. */
	uint8_t accum = 0;  /* Accumulator for segment. */
    /* Catch NULL pointer. */
    if (str == 0)
        return 0;
    /* Process every character in string. */

    while (*str != '\0') {
        /* Segment changeover. */

        if (*str == '.') {
            /* Must have some digits in segment. */
            if (chcnt == 0)
                return 0;
            /* Limit number of segments. */
            if (++segs == 4)
                return 0;
            /* Reset segment values and restart loop. */
            chcnt = accum = 0;
            str++;
            continue;
        }

        /* Check numeric. */
        if ((*str < '0') || (*str > '9'))
            return 0;

        /* Accumulate and check segment. */

        if ((accum = accum * 10 + *str - '0') > 255)
            return 0;
        /* Advance other segment specific stuff and continue loop. */

        chcnt++;
        str++;
    }

    /* Check enough segments and enough characters in last segment. */

    if (segs != 3)
        return 0;
    if (chcnt == 0)
        return 0;
    /* Address okay. */

    return 1;
}
uint8_t ICACHE_FLASH_ATTR UTILS_StrToIP(const int8_t* str, void *ip)
{

	    /* The count of the number of bytes processed. */
	    int i;
	    /* A pointer to the next digit to process. */
	    const char * start;

	    start = str;
	    for (i = 0; i < 4; i++) {
	        /* The digit being processed. */
	        char c;
	        /* The value of this byte. */
	        int n = 0;
	        while (1) {
	            c = * start;
	            start++;
	            if (c >= '0' && c <= '9') {
	                n *= 10;
	                n += c - '0';
	            }
	            /* We insist on stopping at "." if we are still parsing
	               the first, second, or third numbers. If we have reached
	               the end of the numbers, we will allow any character. */
	            else if ((i < 3 && c == '.') || i == 3) {
	                break;
	            }
	            else {
	                return 0;
	            }
	        }
	        if (n >= 256) {
	            return 0;
	        }
	        ((uint8_t*)ip)[i] = n;
	    }
	    return 1;

}
uint32_t ICACHE_FLASH_ATTR UTILS_Atoh(const int8_t *s)
{
	uint32_t value = 0, digit;
	int8_t c;
	
	while((c = *s++)){
		if('0' <= c && c <= '9')
			digit = c - '0';
		else if('A' <= c && c <= 'F')
			digit = c - 'A' + 10;
		else if('a' <= c && c<= 'f')
			digit = c - 'a' + 10;
		else break;
		
		value = (value << 4) | digit;
	}
	
	return value;
}