diff --git a/include_/bic.h b/include_/bic.h
new file mode 100644
index 0000000..48ea6a0
--- /dev/null
+++ b/include_/bic.h
@@ -0,0 +1,51 @@
+/**
+    Copyright (C) powturbo 2013-2023
+    GPL v2 License
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, write to the Free Software Foundation, Inc.,
+    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+    - homepage : https://sites.google.com/site/powturbo/
+    - github   : https://github.com/powturbo
+    - twitter  : https://twitter.com/powturbo
+    - email    : powturbo [_AT_] gmail [_DOT_] com
+**/
+//-- "Interpolative Coding" --------------------------------------------------------------
+#if defined(_MSC_VER) && (_MSC_VER < 1600)
+  #if !defined(_STDINT) && !defined(_MSC_STDINT_H_)
+typedef unsigned char      uint8_t;
+typedef unsigned short     uint16_t;
+typedef unsigned int       uint32_t;
+typedef unsigned long long uint64_t;
+  #endif
+#else
+#include <stdint.h>
+#endif
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+unsigned bicsenc32(uint32_t      *in, unsigned n, unsigned char *out);
+unsigned bicsdec32(unsigned char *in, unsigned n, uint32_t      *out);
+unsigned bicenc32( uint32_t      *in, unsigned n, unsigned char *out);
+unsigned bicdec32( unsigned char *in, unsigned n, uint32_t      *out);
+unsigned bicmenc32(uint32_t      *in, unsigned n, unsigned char *out);
+unsigned bicmdec32(unsigned char *in, unsigned n, uint32_t      *out);
+
+#ifdef __cplusplus
+}
+#endif
+