Initial commit

game_payload/src/utils.c

@@ -0,0 +1,30 @@
+#include <windows.h>
+
+#include <crc32.h>
+#include <err.h>
+
+#include <utils.h>
+
+uint32_t utils_file_crc32c(const char *filePath) {
+    HANDLE file = CreateFileA(filePath, FILE_READ_ACCESS, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+    if (!file) {
+        err_mb_a("Could not open file: %s", filePath);
+    }
+
+    LARGE_INTEGER fileSize;
+    GetFileSizeEx(file, &fileSize);
+
+    HANDLE hMap = CreateFileMappingA(file, NULL, PAGE_READONLY, 0, 0, NULL);
+    char *map = MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0);
+    if (!map) {
+        err_mb_a("Could not create file mapping for %s", filePath);
+    }
+
+    uint32_t crc = crc32c(0, (unsigned char*)map, fileSize.QuadPart);
+
+    UnmapViewOfFile(map);
+    CloseHandle(hMap);
+    CloseHandle(file);
+
+    return crc;
+}