pma: wip: forgot checksum.h

rust/ares_pma/c-src/lib/checksum.h

@@ -0,0 +1,66 @@
+/*
+ * Library: libcrc
+ * File:    include/checksum.h (herein src/includes/checksum.h)
+ * Author:  Lammert Bies
+ *
+ * This file is licensed under the MIT License as stated below
+ *
+ * Copyright (c) 1999-2016 Lammert Bies
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * -----------
+ * Accessed in 2023 by Alex Shelkovnykov on behalf of Tlon Corporation from
+ * https://github.com/lammertb/libcrc/tree/v2.0.
+ *
+ * Description
+ * -----------
+ * The headerfile src/includes/checksum.h contains the definitions and
+ * prototypes for routines that can be used to calculate several kinds of
+ * checksums.
+ */
+
+#ifndef DEF_LIBCRC_CHECKSUM_H
+#define DEF_LIBCRC_CHECKSUM_H
+
+#include <stdint.h>
+
+/*
+ * #define CRC_POLY_xxxx
+ *
+ * The constants of the form CRC_POLY_xxxx define the polynomials for some well
+ * known CRC calculations.
+ */
+#define CRC_POLY_32   0xEDB88320L
+
+/*
+ * #define CRC_START_xxxx
+ *
+ * The constants of the form CRC_START_xxxx define the values that are used for
+ * initialization of a CRC value for common used calculation methods.
+ */
+#define CRC_START_32  0xFFFFFFFFL
+
+/*
+ * Prototype list of global functions
+ */
+uint32_t  crc_32(const unsigned char *input_str, size_t num_bytes);
+uint32_t  update_crc_32(uint32_t crc, unsigned char c);
+
+#endif  // DEF_LIBCRC_CHECKSUM_H