src/lib/hex-dec.c

/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "hex-dec.h"

void dec2hex(unsigned char *hexstr, uintmax_t dec, unsigned int hexstr_size)
{
    unsigned int i;

    for (i = 0; i < hexstr_size; i++) {
        unsigned int value = dec & 0x0f;
        if (value < 10)
            hexstr[hexstr_size-i-1] = value + '0';
        else
            hexstr[hexstr_size-i-1] = value - 10 + 'A';
        dec >>= 4;
    }
}

uintmax_t hex2dec(const unsigned char *data, unsigned int len)
{
    unsigned int i;
    uintmax_t value = 0;

    for (i = 0; i < len; i++) {
        value = value*0x10;
        if (data[i] >= '0' && data[i] <= '9')
            value += data[i]-'0';
        else if (data[i] >= 'A' && data[i] <= 'F')
            value += data[i]-'A' + 10;
        else if (data[i] >= 'a' && data[i] <= 'f')
            value += data[i]-'a' + 10;
        else
            return 0;
    }
    return value;
}