添加项目文件。

Etw Syscall/libpeconv-master/tests/test_case3/checksum.cpp

@@ -0,0 +1,35 @@
+#include "checksum.h"
+
+inline DWORD rotl32a(DWORD x, DWORD n)
+{
+    return (x << n) | (x >> (32 - n));
+}
+
+inline char to_lower(char c)
+{
+    if (c >= 'A' && c <= 'Z') {
+        c = c - 'A' + 'a';
+    }
+    return c;
+}
+
+DWORD calc_checksum(BYTE *str, size_t buf_size, bool enable_tolower)
+{
+    if (str == NULL) return 0;
+
+    DWORD checksum = 0;
+    for (size_t i = 0; i < buf_size; i++) {
+        checksum = rotl32a(checksum, 7);
+        char c = str[i];
+        if (enable_tolower) {
+            c = to_lower(c);
+        }
+        checksum ^= c;
+    }
+    return checksum;
+}
+
+DWORD calc_checksum(char *str, bool enable_tolower)
+{
+    return calc_checksum((BYTE*)str, strlen(str), enable_tolower);
+}