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kernel: lib: Add convert functions for hex strings and binary arrays

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Move duplicate hex2bin and add bin2hex function so that application can
use the functions and avoid code duplication.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>
This commit is contained in:
Joakim Andersson 2019-05-28 13:20:35 +02:00 • committed by Carles Cufí
commit 7a93e948a9
9 changed files with 161 additions and 140 deletions
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51
include/sys/util.h
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@ -18,6 +18,7 @@
#include <zephyr/types.h>
#include <stdbool.h>
#include <stddef.h>
/* Helper to pass a int as a pointer or vice-versa. */
#define POINTER_TO_UINT(x) ((uintptr_t) (x))
@ -122,6 +123,56 @@ static inline s64_t arithmetic_shift_right(s64_t value, u8_t shift)
return (value >> shift) | (sign_ext << (64 - shift));
}
/**
* @brief Convert a single character into a hexadecimal nibble.
*
* @param[in] c The character to convert
* @param x The address of storage for the converted number.
*
* @return Zero on success or (negative) error code otherwise.
*/
int char2hex(char c, u8_t *x);
/**
* @brief Convert a single hexadecimal nibble into a character.
*
* @param[in] c The number to convert
* @param x The address of storage for the converted character.
*
* @return Zero on success or (negative) error code otherwise.
*/
int hex2char(u8_t x, char *c);
/**
* @brief Convert a binary array into string representation.
*
* @param[in] buf The binary array to convert
* @param[in] buflen The length of the binary array to convert
* @param[out] hex Address of where to store the string representation.
* @param[in] hexlen Size of the storage area for string representation.
*
* @return The length of the converted string, or 0 if an error occurred.
*/
size_t bin2hex(const u8_t *buf, size_t buflen, char *hex, size_t hexlen);
/*
* Convert hex string to byte string
* Return number of bytes written to buf, or 0 on error
* @return The length of the converted array, or 0 if an error occurred.
*/
/**
* @brief Convert a hexadecimal string into a binary array.
*
* @param[in] hex The hexadecimal string to convert
* @param[in] hexlen The length of the hexadecimal string to convert.
* @param[out] buf Address of where to store the binary data
* @param[in] buflen Size of the storage area for binary data
*
* @return The length of the binary array , or 0 if an error occurred.
*/
size_t hex2bin(const char *hex, size_t hexlen, u8_t *buf, size_t buflen);
#endif /* !_ASMLANGUAGE */
/* KB, MB, GB */