diff --git a/CHANGES.md b/CHANGES.md
index 2316625..13df064 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,9 @@
 # Changes
 
+## Version 1.04
+- revart: https://github.com/suzukiplan/vgs-mml-compiler/pull/6
+- added: `vgsmml_compile_from_memory2` as a function without memory destruction
+
 ## Version 1.03
 - ensures duplicate memory of MML string: https://github.com/AmamiyaRinyuki/vgs-bgm-plugins/issues/1
 
diff --git a/src/vgsmml.c b/src/vgsmml.c
index a25cc7f..b970503 100644
--- a/src/vgsmml.c
+++ b/src/vgsmml.c
@@ -144,13 +144,14 @@ struct VgsBgmData* __stdcall vgsmml_compile_from_file(const char* path, struct V
     return result;
 }
 
+/* NOTE: YOU MUST SPECIFY THE NULL TERMINATED STRING TO THE DATA ARGUMENT */
 struct VgsBgmData* __stdcall vgsmml_compile_from_memory(void* data, size_t size, struct VgsMmlErrorInfo* err)
 {
     struct VgsBgmData* result;
     int nLine, cLine;
     int i;
     int* pos;
-    char* buf;
+    char* buf = (char*)data;
 
     if (NULL == err) {
         return NULL;
@@ -161,15 +162,12 @@ struct VgsBgmData* __stdcall vgsmml_compile_from_memory(void* data, size_t size,
         return NULL;
     }
 
-    /* ensures duplicate memory */
-    buf = (char*)malloc(size + 1);
-    if (NULL == buf) {
-        strcpy(err->message, "no memory");
-        err->code = VGSMML_ERR_NO_MEMORY;
+    /* memory check */
+    if ('\0' != buf[size - 1]) {
+        strcpy(err->message, "needed specify the \'\\0\' terminated string to the data argument.");
+        err->code = VGSMML_ERR_INVALID;
         return NULL;
     }
-    memcpy(buf, data, size);
-    buf[size] = '\0';
 
     /* count line */
     for (nLine = 1, i = 0; buf[i]; i++) {
@@ -180,7 +178,6 @@ struct VgsBgmData* __stdcall vgsmml_compile_from_memory(void* data, size_t size,
     if (NULL == (pos = (int*)malloc((nLine + 1) * sizeof(int)))) {
         strcpy(err->message, "no memory");
         err->code = VGSMML_ERR_NO_MEMORY;
-        free(buf);
         return NULL;
     }
 
@@ -207,6 +204,34 @@ struct VgsBgmData* __stdcall vgsmml_compile_from_memory(void* data, size_t size,
     /* execute next phase */
     result = phase3(buf, pos, err);
     free(pos);
+    return result;
+}
+
+/* compiles without memory destruction */
+struct VgsBgmData* __stdcall vgsmml_compile_from_memory2(const void* data, size_t size, struct VgsMmlErrorInfo* err)
+{
+    struct VgsBgmData* result;
+    char* buf;
+
+    if (NULL == err) {
+        return NULL;
+    }
+    if (NULL == data || size < 1) {
+        strcpy(err->message, "invalid data size");
+        err->code = VGSMML_ERR_INVALID;
+        return NULL;
+    }
+
+    buf = (char*)malloc(size + 1);
+    if (NULL == buf) {
+        strcpy(err->message, "no memory");
+        err->code = VGSMML_ERR_NO_MEMORY;
+        return NULL;
+    }
+    memcpy(buf, data, size);
+    buf[size] = '\0';
+
+    result = vgsmml_compile_from_memory(buf, size + 1, err);
     free(buf);
     return result;
 }
diff --git a/src/vgsmml.h b/src/vgsmml.h
index 0cc318d..1abde24 100644
--- a/src/vgsmml.h
+++ b/src/vgsmml.h
@@ -27,10 +27,12 @@ struct VgsMmlErrorInfo {
 #ifdef _WIN32
 struct VgsBgmData* __stdcall vgsmml_compile_from_file(const char* path, struct VgsMmlErrorInfo* err);
 struct VgsBgmData* __stdcall vgsmml_compile_from_memory(void* data, size_t size, struct VgsMmlErrorInfo* err);
+struct VgsBgmData* __stdcall vgsmml_compile_from_memory2(const void* data, size_t size, struct VgsMmlErrorInfo* err);
 void __stdcall vgsmml_free_bgm_data(struct VgsBgmData* data);
 #else
 struct VgsBgmData* vgsmml_compile_from_file(const char* path, struct VgsMmlErrorInfo* err);
 struct VgsBgmData* vgsmml_compile_from_memory(void* data, size_t size, struct VgsMmlErrorInfo* err);
+struct VgsBgmData* vgsmml_compile_from_memory2(const void* data, size_t size, struct VgsMmlErrorInfo* err);
 void vgsmml_free_bgm_data(struct VgsBgmData* data);
 #endif
 
diff --git a/test/test_memchk.c b/test/test_memchk.c
index e3ec26a..65a8769 100644
--- a/test/test_memchk.c
+++ b/test/test_memchk.c
@@ -7,8 +7,9 @@ int main(int argc, char* argv[])
     struct VgsMmlErrorInfo err;
     char foo[4];
     strcpy(foo, "foo");
-    if (NULL == vgsmml_compile_from_memory(foo, 3, &err) && VGSMML_ERR_SYNTAX_UNKNOWN == err.code && 1 == err.line) {
-        printf("%s (code=%d, line=%d)\n", err.message, err.code, err.line);
+    if (NULL == vgsmml_compile_from_memory(foo, 3, &err) && VGSMML_ERR_INVALID == err.code) {
+        puts(err.message);
+        puts("test succeed");
         return 0;
     }
     puts("test failed");