finish rewrite (for old version)

Source/rewrite-hoc-clk/common/include/crc32.h

@@ -18,39 +18,7 @@
 #pragma once
 #include <stdio.h>
 #include <stdint.h>
-
-uint32_t crc32(const uint8_t *data, size_t length) {
-    uint32_t crc = 0xFFFFFFFF;
-    
-    for (size_t i = 0; i < length; i++) {
-        crc ^= data[i];
-        for (int j = 0; j < 8; j++) {
-            crc = (crc >> 1) ^ (0xEDB88320 & -(crc & 1));
-        }
-    }
-    return ~crc;
+namespace crc32 {
+    uint32_t crc32(const uint8_t *data, size_t length);
+    uint32_t checksum_file(const char *filename);
 }
-
-uint32_t checksum_file(const char *filename) {
-    FILE *file = fopen(filename, "rb");
-    if (!file) {
-        perror("[crc32] Error opening file");
-        return 0;
-    }
-    
-    uint8_t buffer[1024];
-    uint32_t crc = 0xFFFFFFFF;
-    size_t bytes_read;
-    
-    while ((bytes_read = fread(buffer, 1, sizeof(buffer), file)) > 0) {
-        for (size_t i = 0; i < bytes_read; i++) {
-            crc ^= buffer[i];
-            for (int j = 0; j < 8; j++) {
-                crc = (crc >> 1) ^ (0xEDB88320 & -(crc & 1));
-            }
-        }
-    }
-    
-    fclose(file);
-    return ~crc;
-}