add jamcrc

src/plugin_jamcrc.c

@@ -0,0 +1,69 @@
+#include <stdbool.h>
+#include "checksum.h"
+
+static void init_crc32_tab(void);
+static bool crc_tab32_init = false;
+static uint32_t	crc_tab32[256];
+
+static void init_crc32_tab(void) {
+
+    uint32_t i;
+    uint32_t j;
+    uint32_t crc;
+
+    for (i = 0; i < 256; i++) {
+        crc = i;
+        for (j = 0; j < 8; j++) {
+            if (crc & 0x00000001L) {
+                crc = (crc >> 1) ^ CRC_POLY_32;
+            }
+            else {
+                crc = crc >> 1;
+            }
+        }
+        crc_tab32[i] = crc;
+    }
+    crc_tab32_init = true;
+}
+
+const char* checkbrute_format()
+{
+    return "JAMCRC";
+}
+
+const char* checkbrute_version()
+{
+    return "0.1";
+}
+
+uint32_t checkbrute_hash32(unsigned char* data, size_t size)
+{
+    uint32_t crc;
+    uint32_t tmp;
+    uint32_t long_c;
+    const unsigned char *ptr;
+    size_t a;
+
+    if (!crc_tab32_init)
+        init_crc32_tab();
+
+    crc = CRC_START_32;
+    ptr = data;
+
+    if (ptr != NULL)
+        for (a = 0; a < size; a++) {
+            long_c = 0x000000FFL & (uint32_t)*ptr;
+            tmp = crc ^ long_c;
+            crc = (crc >> 8) ^ crc_tab32[tmp & 0xff];
+            ptr++;
+        }
+
+    crc ^= 0x00000000L;
+
+    return crc & 0xffffffffL;
+}
+
+int checkbrute_hashsz()
+{
+    return 4;
+}