diff --git a/lib/cryptopp/License.txt b/lib/cryptopp/License.txt
new file mode 100644
index 0000000..e2a30d9
--- /dev/null
+++ b/lib/cryptopp/License.txt
@@ -0,0 +1,83 @@
+Compilation Copyright (c) 1995-2019 by Wei Dai.  All rights reserved.
+This copyright applies only to this software distribution package
+as a compilation, and does not imply a copyright on any particular
+file in the package.
+
+All individual files in this compilation are placed in the public domain by
+Wei Dai and other contributors.
+
+I would like to thank the following authors for placing their works into
+the public domain:
+
+Joan Daemen - 3way.cpp
+Leonard Janke - cast.cpp, seal.cpp
+Steve Reid - cast.cpp
+Phil Karn - des.cpp
+Andrew M. Kuchling - md2.cpp, md4.cpp
+Colin Plumb - md5.cpp
+Seal Woods - rc6.cpp
+Chris Morgan - rijndael.cpp
+Paulo Baretto - rijndael.cpp, skipjack.cpp, square.cpp
+Richard De Moliner - safer.cpp
+Matthew Skala - twofish.cpp
+Kevin Springle - camellia.cpp, shacal2.cpp, ttmac.cpp, whrlpool.cpp, ripemd.cpp
+Ronny Van Keer - sha3.cpp
+Aumasson, Neves, Wilcox-O'Hearn and Winnerlein - blake2.cpp, blake2b_simd.cpp, blake2s_simd.cpp
+Aaram Yun - aria.cpp, aria_simd.cpp
+Han Lulu, Markku-Juhani O. Saarinen - sm4.cpp sm4_simd.cpp
+Daniel J. Bernstein, Jack Lloyd - chacha.cpp, chacha_simd.cpp, chacha_avx.cpp
+Andrew Moon - ed25519, x25519, donna_32.cpp, donna_64.cpp, donna_sse.cpp
+
+The Crypto++ Library uses portions of Andy Polyakov's CRYPTOGAMS for Poly1305
+scalar multiplication, aes_armv4.S, sha1_armv4.S and sha256_armv4.S. CRYPTOGAMS
+is dual licensed with a permissive BSD-style license. The CRYPTOGAMS license is
+reproduced below.
+
+The Crypto++ Library uses portions of Jack Lloyd's Botan for ChaCha SSE2 and
+AVX. Botan placed the code in public domain for Crypto++ to use.
+
+The Crypto++ Library (as a compilation) is currently licensed under the Boost
+Software License 1.0 (http://www.boost.org/users/license.html).
+
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+CRYPTOGAMS License
+
+Copyright (c) 2006-2017, CRYPTOGAMS by <appro@openssl.org>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+* Redistributions of source code must retain copyright notices,
+  this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the following
+  disclaimer in the documentation and/or other materials
+  provided with the distribution.
+* Neither the name of the CRYPTOGAMS nor the names of its copyright
+  holder and contributors may be used to endorse or promote products
+  derived from this software without specific prior written permission.
diff --git a/lib/cryptopp/readme.md b/lib/cryptopp/readme.md
new file mode 100644
index 0000000..860fe15
--- /dev/null
+++ b/lib/cryptopp/readme.md
@@ -0,0 +1 @@
+Part of https://github.com/weidai11/cryptopp will be copied here, but I cannot find "the proper part" so far.
diff --git a/lib/cryptopp/zlibutil_cryptopp.cpp b/lib/cryptopp/zlibutil_cryptopp.cpp
new file mode 100644
index 0000000..eead4af
--- /dev/null
+++ b/lib/cryptopp/zlibutil_cryptopp.cpp
@@ -0,0 +1,47 @@
+#include <stdio.h>
+
+#include "../zlib/zlib.h"
+#include <cryptopp/zdeflate.h>
+#include <cryptopp/zinflate.h>
+
+extern "C" int cryptopp_deflate(
+	unsigned char *dest,
+	size_t *destLen,
+	const unsigned char *source,
+	size_t sourceLen,
+	int level
+){
+	CryptoPP::Deflator zipper(NULL,level,CryptoPP::Deflator::DEFAULT_LOG2_WINDOW_SIZE,false);
+	//zipper.Put(source,sourceLen);
+	zipper.Put2(source,sourceLen,1,true);
+	//zipper.MessageEnd(); // Put2 already sends MessageEnd, so this line will cause double-call (?)
+	size_t avail = zipper.MaxRetrievable();
+	if(!avail)return Z_NEED_DICT; // ???
+	if(avail>*destLen)return Z_BUF_ERROR;
+	*destLen = avail;
+	zipper.Get(dest,avail);
+	return 0;
+}
+
+extern "C" int cryptopp_inflate(
+	unsigned char *dest,
+	size_t *destLen,
+	const unsigned char *source,
+	size_t sourceLen
+){
+	CryptoPP::Inflator zipper;
+	try{
+		//zipper.Put(source,sourceLen);
+		zipper.Put2(source,sourceLen,1,true);
+		//zipper.MessageEnd();
+	}catch(CryptoPP::Inflator::BadBlockErr){
+		return Z_DATA_ERROR;
+	}catch(CryptoPP::Inflator::BadDistanceErr){
+		return Z_DATA_ERROR;
+	}
+	size_t avail = zipper.MaxRetrievable();
+	if(avail>*destLen)return Z_BUF_ERROR;
+	*destLen = avail;
+	zipper.Get(dest,avail);
+	return 0;
+}
diff --git a/lib/xorshift.c b/lib/xorshift.c
new file mode 100644
index 0000000..e06a579
--- /dev/null
+++ b/lib/xorshift.c
@@ -0,0 +1,33 @@
+#include <limits.h>
+#include "xorshift.h"
+
+//I hope (sizeof(val)*CHAR_BIT-(rot)) will be precalculated in compilation.
+//#define lrotr(val,rot) (( (val)<<(sizeof(val)*CHAR_BIT-(rot)) )|( (val)>>(rot) ))
+#define lrotl(val,rot) (( (val)<<(rot) )|( (val)>>(sizeof(val)*CHAR_BIT-(rot)) ))
+
+static unsigned int x = 123456789;
+static unsigned int y = 362436069;
+static unsigned int z = 521288629;
+static unsigned int w = 88675123; 
+
+unsigned int xor_rand(){
+	unsigned int t;
+	t=x^(x<<11);
+	x=y;y=z;z=w;
+	return w=(w^(w>>19)) ^ (t^(t>>8));
+}
+
+// http://d.hatena.ne.jp/gintenlabo/20100930/1285859540
+void xor_srand(unsigned int seed){
+#if 1
+	x^=seed;
+	y^=lrotl(seed,17);
+	z^=lrotl(seed,31);
+	w^=lrotl(seed,18);
+#else
+	x^=lrotl(seed,14);
+	y^=lrotl(seed,31);
+	z^=lrotl(seed,13);
+	w^=seed;
+#endif
+}
diff --git a/lib/xorshift.h b/lib/xorshift.h
new file mode 100644
index 0000000..3503e25
--- /dev/null
+++ b/lib/xorshift.h
@@ -0,0 +1,15 @@
+#ifndef _XORSHIFT_H_
+#define _XORSHIFT_H_
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+unsigned int xor_rand();
+void xor_srand(unsigned int seed);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/xutil.c b/lib/xutil.c
new file mode 100644
index 0000000..05911ce
--- /dev/null
+++ b/lib/xutil.c
@@ -0,0 +1,101 @@
+#include "../compat.h"
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include "xutil.h"
+
+unsigned long long int read64(const void *p){
+	const unsigned char *x=(const unsigned char*)p;
+	return x[0]|(x[1]<<8)|(x[2]<<16)|((unsigned int)x[3]<<24)|( (unsigned long long int)(x[4]|(x[5]<<8)|(x[6]<<16)|((unsigned int)x[7]<<24)) <<32);
+}
+
+#if 0
+//write32 is now defined in lzmasdk.c.
+unsigned int read32(const void *p){
+	const unsigned char *x=(const unsigned char*)p;
+	return x[0]|(x[1]<<8)|(x[2]<<16)|((unsigned int)x[3]<<24);
+}
+#endif
+
+unsigned int read24(const void *p){
+	const unsigned char *x=(const unsigned char*)p;
+	return x[0]|(x[1]<<8)|(x[2]<<16);
+}
+
+unsigned short read16(const void *p){
+	const unsigned char *x=(const unsigned char*)p;
+	return x[0]|(x[1]<<8);
+}
+
+void write64(void *p, const unsigned long long int n){
+	unsigned char *x=(unsigned char*)p;
+	x[0]=n&0xff,x[1]=(n>>8)&0xff,x[2]=(n>>16)&0xff,x[3]=(n>>24)&0xff,
+	x[4]=(n>>32)&0xff,x[5]=(n>>40)&0xff,x[6]=(n>>48)&0xff,x[7]=(n>>56)&0xff;
+}
+
+#if 0
+//write32 is now defined in lzmasdk.c.
+void write32(void *p, const unsigned int n){
+	unsigned char *x=(unsigned char*)p;
+	x[0]=n&0xff,x[1]=(n>>8)&0xff,x[2]=(n>>16)&0xff,x[3]=(n>>24)&0xff;
+}
+#endif
+
+void write24(void *p, const unsigned int n){
+	unsigned char *x=(unsigned char*)p;
+	x[0]=n&0xff,x[1]=(n>>8)&0xff,x[2]=(n>>16)&0xff;
+}
+
+void write16(void *p, const unsigned short n){
+	unsigned char *x=(unsigned char*)p;
+	x[0]=n&0xff,x[1]=(n>>8)&0xff;
+}
+
+unsigned long long int read64be(const void *p){
+	const unsigned char *x=(const unsigned char*)p;
+	return x[7]|(x[6]<<8)|(x[5]<<16)|((unsigned int)x[4]<<24)|( (unsigned long long int)(x[3]|(x[2]<<8)|(x[1]<<16)|((unsigned int)x[0]<<24)) <<32);
+}
+
+unsigned int read32be(const void *p){
+	const unsigned char *x=(const unsigned char*)p;
+	return x[3]|(x[2]<<8)|(x[1]<<16)|((unsigned int)x[0]<<24);
+}
+
+unsigned int read24be(const void *p){
+	const unsigned char *x=(const unsigned char*)p;
+	return x[2]|(x[1]<<8)|(x[0]<<16);
+}
+
+unsigned short read16be(const void *p){
+	const unsigned char *x=(const unsigned char*)p;
+	return x[1]|(x[0]<<8);
+}
+
+void write64be(void *p, const unsigned long long int n){
+	unsigned char *x=(unsigned char*)p;
+	x[7]=n&0xff,x[6]=(n>>8)&0xff,x[5]=(n>>16)&0xff,x[4]=(n>>24)&0xff,
+	x[3]=(n>>32)&0xff,x[2]=(n>>40)&0xff,x[1]=(n>>48)&0xff,x[0]=(n>>56)&0xff;
+}
+
+void write32be(void *p, const unsigned int n){
+	unsigned char *x=(unsigned char*)p;
+	x[3]=n&0xff,x[2]=(n>>8)&0xff,x[1]=(n>>16)&0xff,x[0]=(n>>24)&0xff;
+}
+
+void write24be(void *p, const unsigned int n){
+	unsigned char *x=(unsigned char*)p;
+	x[2]=n&0xff,x[1]=(n>>8)&0xff,x[0]=(n>>16)&0xff;
+}
+
+void write16be(void *p, const unsigned short n){
+	unsigned char *x=(unsigned char*)p;
+	x[1]=n&0xff,x[0]=(n>>8)&0xff;
+}
+
+char* myfgets(char *buf,int n,FILE *fp){ //accepts LF/CRLF
+	char *ret=fgets(buf,n,fp);
+	if(!ret)return NULL;
+	if(strlen(buf)&&buf[strlen(buf)-1]=='\n')buf[strlen(buf)-1]=0;
+	if(strlen(buf)&&buf[strlen(buf)-1]=='\r')buf[strlen(buf)-1]=0;
+	return ret;
+}
diff --git a/lib/xutil.h b/lib/xutil.h
new file mode 100644
index 0000000..b48b9d9
--- /dev/null
+++ b/lib/xutil.h
@@ -0,0 +1,68 @@
+#ifndef _XUTIL_H_
+#define _XUTIL_H_
+
+#ifdef __cplusplus
+extern "C"{
+#endif
+
+#include <stdio.h>
+#include <stdbool.h>
+
+unsigned long long read64(const void *p);
+unsigned int read32(const void *p);
+unsigned int read24(const void *p);
+unsigned short read16(const void *p);
+
+void write64(void *p, const unsigned long long n);
+void write32(void *p, const unsigned int n);
+void write24(void *p, const unsigned int n);
+void write16(void *p, const unsigned short n);
+
+unsigned long long read64be(const void *p);
+unsigned int read32be(const void *p);
+unsigned int read24be(const void *p);
+unsigned short read16be(const void *p);
+
+void write64be(void *p, const unsigned long long n);
+void write32be(void *p, const unsigned int n);
+void write24be(void *p, const unsigned int n);
+void write16be(void *p, const unsigned short n);
+
+//accepts LF/CRLF
+char* myfgets(char *buf,int n,FILE *fp);
+
+void msleep(int msec);
+int strchrindex(const char *s, const int c, const int idx);
+unsigned int txt2bin(const char *src, unsigned char *dst, unsigned int len);
+
+size_t _FAT_directory_mbstoucs2(unsigned short* dst, const unsigned char* src, size_t len);
+size_t mbstoucs2(unsigned short* dst, const unsigned char* src);
+size_t _FAT_directory_ucs2tombs(unsigned char* dst, const unsigned short* src, size_t len);
+size_t ucs2tombs(unsigned char* dst, const unsigned short* src);
+
+void NullMemory(void* buf, unsigned int n);
+int memcmp_fast(const void *x,const void *y,unsigned int n);
+
+void *_memmem(const void *s1, size_t siz1, const void *s2, size_t siz2);
+void *_memstr(const void *s1, const char *s2, size_t siz1);
+
+int makedir(const char *_dir);
+bool wildmatch(const char *pattern, const char *compare);
+
+enum{
+	wildmode_string,
+	wildmode_samedir,
+	wildmode_recursive,
+};
+
+bool matchwildcard(const char *wildcard, const char *string);
+bool matchwildcard2(const char *wildcard, const char *string, const int iMode);
+
+bool fixpath(const char *src, char *dest);
+const char* mybasename(const char *src);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/lib/zlibutil.c b/lib/zlibutil.c
index f6ee591..cbc5918 100644
--- a/lib/zlibutil.c
+++ b/lib/zlibutil.c
@@ -10,6 +10,43 @@
 #include "lzma.h"
 //#include "zlib-ng/zlib-ng.h"
 
+// gzip flag byte
+#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
+#define HEAD_CRC     0x02 /* bit 1 set: header CRC present */
+#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
+#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
+#define COMMENT      0x10 /* bit 4 set: file comment present */
+#define RESERVED     0xE0 /* bits 5..7: reserved */
+
+int read_gz_header_generic(unsigned char *data, int size, int *extra_off, int *extra_len){
+	int method, flags, n, len;
+	if(size < 2) return 0;
+	if(data[0] != 0x1f || data[1] != 0x8b) return 0;
+	if(size < 4) return 0;
+	method = data[2];
+	flags  = data[3];
+	if(method != Z_DEFLATED || (flags & RESERVED)) return 0;
+	n = 4 + 6; // Skip 6 bytes
+	*extra_off = n + 2;
+	*extra_len = 0;
+	if(flags & EXTRA_FIELD){
+		if(size < n + 2) return 0;
+		len = data[n]|(data[n+1]<<8);
+		n += 2;
+		*extra_off = n;
+		*extra_len = len;
+		if(size < n + len) return 0;
+		n += len;
+	}
+	if(flags & ORIG_NAME) while(n < size && data[n++]);
+	if(flags & COMMENT) while(n < size && data[n++]);
+	if(flags & HEAD_CRC){
+		if(n + 2 > size) return 0;
+		n += 2;
+	}
+	return n;
+}
+
 static inline void write32be(void *p, const unsigned int n){
 	unsigned char *x=(unsigned char*)p;
 	x[3]=n&0xff,x[2]=(n>>8)&0xff,x[1]=(n>>16)&0xff,x[0]=(n>>24)&0xff;
diff --git a/lib/zlibutil.h b/lib/zlibutil.h
index 3e796e5..8b7e0cc 100644
--- a/lib/zlibutil.h
+++ b/lib/zlibutil.h
@@ -8,6 +8,8 @@ extern "C"{
 #include <stdio.h>
 #include "zlib/zlib.h"
 
+int read_gz_header_generic(unsigned char *data, int size, int *extra_off, int *extra_len);
+
 enum{
 	DEFLATE_ZLIB = 0,
 	DEFLATE_7ZIP,
@@ -17,6 +19,7 @@ enum{
 	DEFLATE_LIBDEFLATE,
 	DEFLATE_ZLIBNG,
 	DEFLATE_IGZIP,
+	DEFLATE_CRYPTOPP,
 };
 
 typedef struct{
@@ -157,6 +160,21 @@ int igzip_inflate(
 	size_t sourceLen
 );
 
+int cryptopp_deflate(
+	unsigned char *dest,
+	size_t *destLen,
+	const unsigned char *source,
+	size_t sourceLen,
+	int level
+);
+
+int cryptopp_inflate(
+	unsigned char *dest,
+	size_t *destLen,
+	const unsigned char *source,
+	size_t sourceLen
+);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/lib/zlibutil_cryptopp.c b/lib/zlibutil_cryptopp.c
new file mode 100644
index 0000000..5ba2472
--- /dev/null
+++ b/lib/zlibutil_cryptopp.c
@@ -0,0 +1,21 @@
+ #include <stdio.h>
+ 
+#if !CRYPTOPP
+int cryptopp_deflate(
+	unsigned char *dest,
+	size_t *destLen,
+	const unsigned char *source,
+	size_t sourceLen,
+	int level
+){
+	return -1;
+}
+int cryptopp_inflate(
+	unsigned char *dest,
+	size_t *destLen,
+	const unsigned char *source,
+	size_t sourceLen
+){
+	return -1;
+}
+#endif
diff --git a/lib/zlibutil_igzip.c b/lib/zlibutil_igzip.c
index 8a3fc0c..6158281 100644
--- a/lib/zlibutil_igzip.c
+++ b/lib/zlibutil_igzip.c
@@ -1,7 +1,7 @@
 #include "isa-l/include/igzip_lib.h"
 #include <stdlib.h> // malloc/free
 
-int level_size_buf[10] = {
+int igzip_level_size_buf[10] = {
 #ifdef ISAL_DEF_LVL0_DEFAULT
 	ISAL_DEF_LVL0_DEFAULT,
 #else
@@ -74,7 +74,7 @@ int igzip_deflate(
 	z.flush = FULL_FLUSH;
 	z.gzip_flag = 0;
 	z.level = level-1;
-	z.level_buf_size = level_size_buf[z.level];
+	z.level_buf_size = igzip_level_size_buf[z.level];
 	z.level_buf = malloc(z.level_buf_size);
 	z.end_of_stream = 1;
 
diff --git a/lib/zlibutil_zlibng.c b/lib/zlibutil_zlibng.c
index 228f875..3cf5396 100644
--- a/lib/zlibutil_zlibng.c
+++ b/lib/zlibutil_zlibng.c
@@ -8,7 +8,7 @@ int zlibng_deflate(
 	size_t sourceLen,
 	int level
 ){
-#ifdef FEOS
+#if defined(NOZLIBNG)
 	return -1;
 #else
 	zng_stream z;
@@ -45,7 +45,7 @@ int zlibng_inflate(
 	const unsigned char *source,
 	size_t sourceLen
 ){
-#ifdef FEOS
+#if defined(NOZLIBNG)
 	return -1;
 #else
 	zng_stream z;