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/* Copyright [2009 - 2019] Exegin Technologies Limited. All rights reserved. */
#include "zigbee.h"
/*FUNCTION:-------------------------------------------------------------------
* NAME
* char_is_space
* DESCRIPTION
* Checks if character is one of the standard white-space characters:
*
* ' ' (0x20) space (SPC)
* '\t' (0x09) horizontal tab (TAB)
* '\n' (0x0a) newline (LF)
* '\v' (0x0b) vertical tab (VT)
* '\f' (0x0c) feed (FF)
* '\r' (0x0d) carriage return (CR)
*
* PARAMETERS
* none
* RETURNS
* none
*----------------------------------------------------------------------------
*/
static bool
char_is_space(uint8_t c)
{
bool rc;
switch (c) {
case 0x09: /* '\t' */
case 0x0a: /* '\n' */
case 0x0b: /* '\v' */
case 0x0c: /* '\f' */
case 0x0d: /* '\r' */
case 0x20: /* ' ' */
rc = true;
break;
default:
rc = false;
break;
} /* switch */
return (rc);
} /* char_is_space */
/*FUNCTION:------------------------------------------------------
* NAME
* zb_hex_str_to_bin
* DESCRIPTION
* A helper for parsing hex strings to binary blobs.
*
* Parses a hexadecimal string into memory. Will skip over
* separator characters. Will stop when maxlen bytes
* have been written, or a NULL character is encountered.
* PARAMETERS
* str ; Input string.
* out ; Output pointer.
* maxlen ; Size of memory that can be written to.
* RETURNS
* int ; Number of bytes written.
*---------------------------------------------------------------
*/
int
zb_hex_str_to_bin(const char *string, void *out, unsigned int maxlen)
{
unsigned int i = 0;
const uint8_t *str = (const uint8_t *)string;
char c;
if (!str) {
return 0;
}
while (i < maxlen) {
if (*str == 0U) {
return (int)i;
}
/* Ignore separators and whitespace. */
c = (char)*str;
if (char_is_space(*str) || (c == ':') || (c == '-') || (c == ',')) {
str++;
continue;
}
/* Convert first nibble. */
if ((c >= 'a') && (c <= 'f')) {
((uint8_t *)out)[i] = (*str - (uint8_t)'a' + 10U) << 4;
}
else if ((c >= 'A') && (c <= 'F')) {
((uint8_t *)out)[i] = (*str - (uint8_t)'A' + 10U) << 4;
}
else if ((c >= '0') && (c <= '9')) {
((uint8_t *)out)[i] = ((uint8_t)(*str - (uint8_t)'0')) << 4;
}
else { /* Invalid nibble */
return -1;
}
str++;
if (*str == 0U) {
return (int)i;
}
/* Ignore separators and whitespace. */
c = (char)*str;
if (char_is_space(*str) || (c == ':') || (c == '-') || (c == ',')) {
str++;
continue;
}
/* Convert the second nibble. */
if ((c >= 'a') && (c <= 'f')) {
((uint8_t *)out)[i] |= (*str - (uint8_t)'a' + 10U);
}
else if ((c >= 'A') && (c <= 'F')) {
((uint8_t *)out)[i] |= (*str - (uint8_t)'A' + 10U);
}
else if ((c >= '0') && (c <= '9')) {
((uint8_t *)out)[i] |= (*str - (uint8_t)'0');
}
else { /* Invalid nibble */
return -1;
}
str++;
i++;
} /* while */
/* Done */
return (int)i;
} /* zb_hex_str_to_bin */
/*FUNCTION:------------------------------------------------------
* NAME
* zb_hex_bin_to_str
* DESCRIPTION
* Convert an array of bytes to a null terminated string of
* hex. For an array of length bytes, without delimiters the
* buffer must be at least 2 * length + 1 . With delimiters
* add the number of delimiters.
* PARAMETERS
* output buffer to store string, WARNING must be at
* least: 2 * length + 1 + #delimiters in length!
* data data to convert
* length number of bytes of data to convert
* delimiter character to use as a delimiter
* interval space between delimiters or zero for none
* RETURNS
* output string length
*---------------------------------------------------------------
*/
unsigned int
zb_hex_bin_to_str(const uint8_t *in_data, unsigned int in_len, char *out_str, unsigned int max_len,
const char delimiter, unsigned int interval)
{
unsigned int i, j;
const char *hex = "0123456789abcdef";
/* FIXME */
if (max_len == 0U) {
return 0;
}
j = 0;
for (i = 0; i < in_len; i++) {
if ((interval != 0U) && (i != 0U) && ((i % interval) == 0U)) {
if ((j + 2U) > max_len) {
out_str[0] = (char)0;
return 0;
}
out_str[j++] = delimiter;
}
if ((j + 3U) > max_len) {
out_str[0] = (char)0;
return 0;
}
out_str[j++] = hex[(in_data[i] >> 4) & 0x0fU];
out_str[j++] = hex[in_data[i] & 0x0fU];
} /* for */
out_str[j] = (char)0;
return j;
} /* zb_hex_bin_to_str */
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