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#ifndef HEX_LL_H
#define HEX_LL_H
enum hexkind {
HEX_KIND_MIXED = 0,
HEX_KIND_LOWER = 1,
};
#ifdef WITH_BREAKING_CHANGES
#define HEX_KIND_OID HEX_KIND_LOWER
#else
#define HEX_KIND_OID HEX_KIND_MIXED
#endif
extern const signed char hexval_table[256];
extern const signed char hexval_lc_table[256];
static inline unsigned int hexval(unsigned char c, enum hexkind kind)
{
return kind == HEX_KIND_MIXED ? hexval_table[c] : hexval_lc_table[c];
}
/*
* Convert two consecutive hexadecimal digits into a char. Return a
* negative value on error. Don't run over the end of short strings.
*/
static inline int hex2chr(const char *s, enum hexkind kind)
{
unsigned int val = hexval(s[0], kind);
return (val & ~0xf) ? val : (val << 4) | hexval(s[1], kind);
}
/*
* Read `len` pairs of hexadecimal digits from `hex` and write the
* values to `binary` as `len` bytes. Return 0 on success, or -1 if
* the input does not consist of hex digits).
*/
int hex_to_bytes(unsigned char *binary, const char *hex, size_t len, enum hexkind kind);
#endif
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