Add FLAC.

tests/crc32.c

@@ -0,0 +1,53 @@
+/*
+ * This file is part of the Aaru Data Preservation Suite.
+ * Copyright (c) 2019-2022 Natalia Portillo.
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of the
+ * License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+#include <stdint.h>
+
+#define CRC32_ISO_POLY 0xEDB88320
+#define CRC32_ISO_SEED 0xFFFFFFFF
+
+    uint32_t crc32_data(const uint8_t* data, uint32_t len)
+    {
+        uint32_t localHashInt = CRC32_ISO_SEED;
+        uint32_t localTable[256];
+        int      i, j;
+
+        for(i = 0; i < 256; i++)
+        {
+            uint32_t entry = (uint32_t)i;
+
+            for(j = 0; j < 8; j++)
+                if((entry & 1) == 1) entry = (entry >> 1) ^ CRC32_ISO_POLY;
+                else
+                    entry >>= 1;
+
+            localTable[i] = entry;
+        }
+
+        for(i = 0; i < len; i++) localHashInt = (localHashInt >> 8) ^ localTable[data[i] ^ (localHashInt & 0xff)];
+
+        localHashInt ^= CRC32_ISO_SEED;
+
+        return localHashInt;
+    }
+#ifdef __cplusplus
+}
+#endif