diff --git a/include/libg1m.h b/include/libg1m.h
index b080d0d..75228b6 100644
--- a/include/libg1m.h
+++ b/include/libg1m.h
@@ -92,6 +92,8 @@ int g1m_decode_mcsfile_head(g1m_mcshead_t *head,
 	uint_fast32_t filesize);
 int g1m_decode_mcsfile(g1m_mcsfile_t **handle,
 	const g1m_mcshead_t *head, g1m_buffer_t *buffer);
+int g1m_decode_mcsfile_data(g1m_mcsfile_t **handle,
+	const g1m_mcshead_t *head, const unsigned char *data, size_t size);
 
 /* open CAS head/file */
 int g1m_decode_casfile_head(g1m_mcshead_t *head,
diff --git a/include/libg1m/internals.h b/include/libg1m/internals.h
index 53f5e89..92a7664 100644
--- a/include/libg1m/internals.h
+++ b/include/libg1m/internals.h
@@ -145,4 +145,7 @@ uint32_t g1m_checksum32(void *mem, size_t size, uint32_t checksum);
 /* File buffer */
 int g1m_filebuffer_read(void *vcookie, unsigned char *buf, size_t size);
 
+/* Callbacks */
+int g1m_membuffer_read(void *cookie, unsigned char *dest, size_t size);
+
 #endif /* LIBG1M_INTERNALS_H */
diff --git a/include/libg1m/mcs.h b/include/libg1m/mcs.h
index dffe410..b430680 100644
--- a/include/libg1m/mcs.h
+++ b/include/libg1m/mcs.h
@@ -66,11 +66,15 @@ typedef struct g1m_mcs_cell_s {
 /* ************************************************************************** */
 /*  Main structures                                                           */
 /* ************************************************************************** */
+/* mcs file head flags */
+# define g1m_mcshead_complex 0x0001 /* is a complex variable */
+
 /* mcs file head */
 typedef struct g1m_mcshead_s {
 	/* file main information */
 	g1m_mcstype_t type;
 	char name[13]; int id;
+	unsigned int flags;
 
 	/* content size */
 	uint_fast32_t size;
diff --git a/src/decode/mcs.c b/src/decode/mcs.c
index c4fc5a5..3ff806c 100644
--- a/src/decode/mcs.c
+++ b/src/decode/mcs.c
@@ -686,7 +686,9 @@ int g1m_decode_mcsfile_head(g1m_mcshead_t *head,
 	/* save raw data */
 	head->_rawtype = raw_type;
 	memcpy(head->_group, groupname, 16);  head->_group[16] = 0;
-	memcpy(head->_dirname, dirname, 8);   head->_dirname[8] = 0;
+	if (dirname) {
+		memcpy(head->_dirname, dirname, 8);   head->_dirname[8] = 0;
+	} else memset(head->_dirname, 0, 9);
 
 	/* everything went well! */
 	return (0);
@@ -760,6 +762,29 @@ fail:
 	return (err);
 }
 
+/**
+ *	g1m_decode_mcsfile_data:
+ *	Decode a MCS file content from raw memory.
+ *
+ *	@arg	handle		the file handle.
+ *	@arg	head		the file head.
+ *	@arg	data		the buffer data.
+ *	@arg	size		the buffer size.
+ *	@return				the libg1m error.
+ */
+
+int g1m_decode_mcsfile_data(g1m_mcsfile_t **handle,
+	const g1m_mcshead_t *head, const unsigned char *data, size_t size)
+{
+	unsigned char *p = data;
+	g1m_buffer_t buffer = {
+		.cookie = p,
+		.read = g1m_membuffer_read
+	};
+
+	return (g1m_decode_mcsfile(handle, head, &buffer));
+}
+
 /* ************************************************************************** */
 /*  Main file function                                                        */
 /* ************************************************************************** */
diff --git a/src/utils/membuffer.c b/src/utils/membuffer.c
new file mode 100644
index 0000000..4a941d9
--- /dev/null
+++ b/src/utils/membuffer.c
@@ -0,0 +1,38 @@
+/* *****************************************************************************
+ * utils/membuffer.c -- memory to libg1m buffer utilities.
+ * Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
+ *
+ * This file is part of libg1m.
+ * libg1m is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3.0 of the License,
+ * or (at your option) any later version.
+ *
+ * libg1m is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with libg1m; if not, see <http://www.gnu.org/licenses/>.
+ * ************************************************************************** */
+#include <libg1m/internals.h>
+#include <string.h>
+
+/**
+ *	g1m_membuffer_read:
+ *	Read from a memory buffer.
+ *
+ *	@arg	vcookie		the cursor (uncasted)
+ *	@arg	dest		the destination buffer.
+ *	@arg	size		the size to read.
+ *	@return				the error, if any.
+ */
+
+int g1m_membuffer_read(void *vcookie, unsigned char *dest, size_t size)
+{
+	const unsigned char **p = (void*)vcookie;
+	memcpy(dest, *p, size);
+	*p += size;
+	return (0);
+}