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/*** Copyright (C) 2001-2025 Zabbix SIA**** This program is free software: you can redistribute it and/or modify it under the terms of** the GNU Affero General Public License as published by the Free Software Foundation, version 3.**** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.** See the GNU Affero General Public License for more details.**** You should have received a copy of the GNU Affero General Public License along with this program.** If not, see <https://www.gnu.org/licenses/>.**//****************************************************************************** * * * Purpose: converts ASCII hex digit string to binary representation (byte * * string) * * * * Parameters: * * p_hex - [IN] null-terminated input string * * buf - [OUT] output buffer * * buf_len - [IN] output buffer size * * * * Return value: * * Number of bytes written into 'buf' on successful conversion. * * -1 - an error occurred. * * * * Comments: * * In case of error incomplete useless data may be written into 'buf'. * * * ******************************************************************************/int zbx_hex2bin(const unsigned char *p_hex, unsigned char *buf, int buf_len){ unsigned char *q = buf; int len = 0; while ('\0' != *p_hex) { if (0 != isxdigit(*p_hex) && 0 != isxdigit(*(p_hex + 1)) && buf_len > len) { unsigned char hi = *p_hex & 0x0f; unsigned char lo; if ('9' < *p_hex++) hi = (unsigned char)(hi + 9u); lo = *p_hex & 0x0f; if ('9' < *p_hex++) lo = (unsigned char)(lo + 9u); *q++ = (unsigned char)(hi << 4 | lo); len++; } else return -1; }