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