52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
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/*
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* Copyright (c) 2025 Lucas Gabriel Vuotto <lucas@lgv5.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <ctype.h>
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#include <string.h>
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#include "bt.h"
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static inline unsigned int xdigittonum(char c);
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static inline unsigned int
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xdigittonum(char c)
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{
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return c >= 'a' ? c - 'a' + 10 : c >= 'A' ? c - 'A' + 10 : c - '0';
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}
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int
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btih_parse(struct btih *btih, const char *s)
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{
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const unsigned char *us = s;
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struct btih h;
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size_t i;
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if (strlen(s) != 2 * BTIH_LEN)
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return 0;
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for (i = 0; i < BTIH_LEN; i++) {
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if (!isxdigit(us[2 * i]) || !isxdigit(us[2 * i + 1]))
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return 0;
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h.hash[i] = (xdigittonum(s[2 * i]) << 4) |
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xdigittonum(s[2 * i + 1]);
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}
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memcpy(btih, &h, sizeof(h));
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return 1;
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}
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