mirror of https://github.com/jb55/nostril.git
70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
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static inline int char_to_hex(unsigned char *val, char c)
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{
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if (c >= '0' && c <= '9') {
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*val = c - '0';
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return 1;
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}
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if (c >= 'a' && c <= 'f') {
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*val = c - 'a' + 10;
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return 1;
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}
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if (c >= 'A' && c <= 'F') {
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*val = c - 'A' + 10;
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return 1;
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}
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return 0;
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}
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static inline int hex_decode(const char *str, size_t slen, void *buf, size_t bufsize)
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{
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unsigned char v1, v2;
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unsigned char *p = buf;
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while (slen > 1) {
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if (!char_to_hex(&v1, str[0]) || !char_to_hex(&v2, str[1]))
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return 0;
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if (!bufsize)
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return 0;
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*(p++) = (v1 << 4) | v2;
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str += 2;
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slen -= 2;
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bufsize--;
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}
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return slen == 0 && bufsize == 0;
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}
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static inline size_t hex_str_size(size_t bytes)
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{
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return 2 * bytes + 1;
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}
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static inline char hexchar(unsigned int val)
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{
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if (val < 10)
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return '0' + val;
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if (val < 16)
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return 'a' + val - 10;
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abort();
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}
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static inline int hex_encode(const void *buf, size_t bufsize, char *dest, size_t destsize)
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{
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size_t i;
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if (destsize < hex_str_size(bufsize)) {
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fprintf(stderr, "hexencode: destsize(%zu) < hex_str_size(%zu)\n", destsize, hex_str_size(bufsize));
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return 0;
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}
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for (i = 0; i < bufsize; i++) {
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unsigned int c = ((const unsigned char *)buf)[i];
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*(dest++) = hexchar(c >> 4);
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*(dest++) = hexchar(c & 0xF);
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}
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*dest = '\0';
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return 1;
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}
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