diff --git a/TurboPFor-Integer-Compression/lib/idx.h b/TurboPFor-Integer-Compression/lib/idx.h
new file mode 100644
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+++ b/TurboPFor-Integer-Compression/lib/idx.h
@@ -0,0 +1,53 @@
+/**
+    Copyright (C) powturbo 2013-2023
+    SPDX-License-Identifier: 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
+**/
+
+//    "Integer Compression" header for idxcr/idxqry
+#include <stdint.h>
+
+#define BLK_DIDNUM (128+1)  //  Block size 128 + 1 (1 stored in skips)
+
+                            //              compressed size for 62 GB clueweb09.sorted
+                            // Defaut is bitpackv/bitunpackv    18 GB
+//#define _TURBOPFOR        // for compact version              12 GB
+
+  #ifdef _TURBOPFOR
+//#define SKIP_S 6
+#define SKIP_SIZE 2         // always no implicit skip.
+  #else
+//#define SKIP_S 5
+#define SKIP_SIZE 2         // no implicit skips
+//#define SKIP_SIZE 1       //    implicit skips
+  #endif
+#define SKIP_M ((1<<SKIP_S)-1)
+
+  #ifdef _WIN32
+#define __off64_t _off64_t
+  #endif
+//-------------------------- Mapping term id <-> posting offset in file ----------------------------------
+typedef struct { uint8_t offseth; uint32_t offsetl; } __attribute__ ((packed)) tmap_t;   // 40 bits offsets -> 1 Terabyte
+
+#define TIDMAPSET(_t_, _ofs_) { (_t_)->offseth = (_ofs_)>>32; (_t_)->offsetl = (_ofs_) & 0xffffffff; }
+//#define TIDMAPGET(_t_) ((__off64_t)(_t_)->offseth << 32 | (_t_)->offsetl)
+#define TIDMAPGET(_t_) ((unsigned long long)(_t_)->offseth << 32 | (_t_)->offsetl)
+#define TIDMAP(_fdm_, _tid_) ({ unsigned char *_bp = _fdm_; tmap_t *_t = (tmap_t *)&_bp[(_tid_)*sizeof(tmap_t)]; TIDMAPGET(_t); })