40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
#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
|