45 lines
954 B
C
45 lines
954 B
C
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/*
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* Copyright 2016 Google Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but without any warranty; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <lib.h>
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#include <string.h>
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size_t hexstrtobin(const char *str, uint8_t *buf, size_t len)
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{
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size_t count, ptr = 0;
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uint8_t byte;
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for (byte = count = 0; str && *str; str++) {
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uint8_t c = *str;
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if (!isxdigit(c))
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continue;
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if (isdigit(c))
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c -= '0';
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else
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c = tolower(c) - 'a' + 10;
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byte <<= 4;
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byte |= c;
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if (++count > 1) {
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if (ptr >= len)
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return ptr;
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buf[ptr++] = byte;
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byte = count = 0;
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}
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}
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return ptr;
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}
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