From 610aa5dd9601780da068b031434099da612d7932 Mon Sep 17 00:00:00 2001
From: Dmitry Isaenko <developer.su@gmail.com>
Date: Fri, 9 Dec 2022 05:37:31 +0300
Subject: [PATCH] 1. Start moving to 'InFileStreamProducer' entity to simplify
 work with [inside-NCA]-[in-pfs0/romfs]-[sub-files] that could be located
 inside encrypted or not encrypted sections. This approach will allow us to
 map filesystem to/as 'enough-informed' objects that could perform actions on
 content without pre-extraction. For example decompress NSO0 'ELF' sections
 from the inside PFS0 that is located inside NCA3 that is located inside
 XCI/NSP. 2. Add NSO0 support. Add NSO0 decompressor/extractor 3. Add logo
 draft sketch, update dependencies, add LZ4 libs deps, add final identifier in
 some places

---
 README.md                                     |   7 +-
 pom.xml                                       |  17 +-
 src/main/java/libKonogonka/Converter.java     |   4 +
 src/main/java/libKonogonka/RainbowDump.java   |   8 +-
 .../NPDM/ACI0/FSAccessHeaderProvider.java     |  20 +-
 .../libKonogonka/Tools/NPDM/NPDMProvider.java |  38 +--
 .../libKonogonka/Tools/NSO/NSO0Provider.java  | 204 ++++++++++++++++
 .../libKonogonka/Tools/NSO/NSO0Unpacker.java  | 221 ++++++++++++++++++
 .../libKonogonka/Tools/NSO/SegmentHeader.java |  49 ++++
 .../Tools/NSO/SegmentHeaderRelative.java      |  43 ++++
 .../Tools/PFS0/IPFS0Provider.java             |   7 +
 .../libKonogonka/Tools/PFS0/PFS0Provider.java |  26 +++
 .../ctraes/InFileStreamProducer.java          | 119 ++++++++++
 .../RomFsDecrypted/NSODecompressTest.java     |  43 ++++
 .../libKonogonka/RomFsDecrypted/NSOTest.java  | 129 ++++++++++
 15 files changed, 894 insertions(+), 41 deletions(-)
 create mode 100644 src/main/java/libKonogonka/Tools/NSO/NSO0Provider.java
 create mode 100644 src/main/java/libKonogonka/Tools/NSO/NSO0Unpacker.java
 create mode 100644 src/main/java/libKonogonka/Tools/NSO/SegmentHeader.java
 create mode 100644 src/main/java/libKonogonka/Tools/NSO/SegmentHeaderRelative.java
 create mode 100644 src/main/java/libKonogonka/ctraes/InFileStreamProducer.java
 create mode 100644 src/test/java/libKonogonka/RomFsDecrypted/NSODecompressTest.java
 create mode 100644 src/test/java/libKonogonka/RomFsDecrypted/NSOTest.java

diff --git a/README.md b/README.md
index 45eaa7f..2d269d1 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# libKonogonka
+<img src="misc/logo.svg" title="" alt="libKonogonka" data-align="center">
 
 ![License](https://img.shields.io/badge/License-GPLv3-blue.svg) [![Build Status](https://ci.redrise.ru/api/badges/desu/libKonogonka/status.svg)](https://ci.redrise.ru/desu/libKonogonka)
 
@@ -13,10 +13,13 @@ You can get this application from independent source location: [https://git.redr
 [GNU General Public License v3 or higher](https://git.redrise.ru/desu/libKonogonka/LICENSE)
 
 ### Used libraries & resources
+
 * [Bouncy Castle](https://www.bouncycastle.org/) for Java.
 * [Java-XTS-AES](https://github.com/horrorho/Java-XTS-AES) by horrorho with minimal changes.
+* [lz4-java](https://github.com/lz4/lz4-java) 
+
+#### Thanks
 
-#### Thanks 
 * Switch brew wiki
 * Original ScriesM software
 * roothorick, [shchmue](https://github.com/shchmue/), He, other Team AtlasNX discord members for their advices, notes and examples!
diff --git a/pom.xml b/pom.xml
index 521eaeb..07d03de 100644
--- a/pom.xml
+++ b/pom.xml
@@ -15,7 +15,7 @@
         <inceptionYear>2022</inceptionYear>
         <organization>
             <name>Dmitry Isaenko</name>
-            <url>https://developersu.blogspot.com/</url>
+            <url>https://redrise.ru/</url>
         </organization>
 
         <licenses>
@@ -67,28 +67,33 @@
             <dependency>
                 <groupId>org.apache.logging.log4j</groupId>
                 <artifactId>log4j-core</artifactId>
-                <version>2.18.0</version>
+                <version>2.19.0</version>
                 <scope>compile</scope>
             </dependency>
             <!-- testing -->
             <dependency>
                 <groupId>org.junit.jupiter</groupId>
                 <artifactId>junit-jupiter-engine</artifactId>
-                <version>5.5.2</version>
+                <version>5.9.0</version>
                 <scope>test</scope>
             </dependency>
             <dependency>
                 <groupId>org.junit.jupiter</groupId>
                 <artifactId>junit-jupiter-api</artifactId>
-                <version>5.5.2</version>
+                <version>5.9.0</version>
                 <scope>test</scope>
             </dependency>
             <dependency>
                 <groupId>org.junit.jupiter</groupId>
                 <artifactId>junit-jupiter-params</artifactId>
-                <version>5.5.2</version>
+                <version>5.9.0</version>
                 <scope>test</scope>
             </dependency>
+            <dependency>
+                <groupId>org.lz4</groupId>
+                <artifactId>lz4-pure-java</artifactId>
+                <version>1.8.0</version>
+            </dependency>
         </dependencies>
         <build>
             <finalName>${project.artifactId}-${project.version}-${maven.build.timestamp}</finalName>
@@ -111,7 +116,7 @@
                         </execution>
                     </executions>
                 </plugin>
-<!-- UNCOMMENT WHEN LEARN HOW TO MAKE NORMAL DOCS
+<!-- UNCOMMENT ONCE LEARN HOW TO MAKE NORMAL DOCS
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-javadoc-plugin</artifactId>
diff --git a/src/main/java/libKonogonka/Converter.java b/src/main/java/libKonogonka/Converter.java
index 8672384..20935f4 100644
--- a/src/main/java/libKonogonka/Converter.java
+++ b/src/main/java/libKonogonka/Converter.java
@@ -56,6 +56,10 @@ public class Converter {
         return sb.toString();
     }
 
+    public static String intToBinaryString(int value){
+        return String.format("%32s", Integer.toBinaryString( value )).replace(' ', '0')+" | "+value;
+    }
+
     public static String longToOctString(long value){
         return String.format("%64s", Long.toBinaryString( value )).replace(' ', '0');
     }
diff --git a/src/main/java/libKonogonka/RainbowDump.java b/src/main/java/libKonogonka/RainbowDump.java
index 3a812db..dba4ffb 100644
--- a/src/main/java/libKonogonka/RainbowDump.java
+++ b/src/main/java/libKonogonka/RainbowDump.java
@@ -41,7 +41,7 @@ public class RainbowDump {
 
     private static StringBuilder stringBuilder;
     public static void hexDumpUTF8(byte[] byteArray){
-        stringBuilder = new StringBuilder();
+        stringBuilder = new StringBuilder(" -- RainbowDump --\n");
         if (byteArray == null || byteArray.length == 0)
             return;
 
@@ -106,11 +106,11 @@ public class RainbowDump {
         System.out.print(new String(byteArray, StandardCharsets.UTF_8)+"\n");
     }
 
-    public static void octDumpInt(int value){
-        System.out.println(String.format("%32s", Integer.toBinaryString( value )).replace(' ', '0')+" | "+value);
+    public static void binDumpInt(int value){
+        log.debug(Converter.intToBinaryString(value));
     }
 
-    public static void octDumpLong(long value){
+    public static void binDumpLong(long value){
         System.out.println(String.format("%64s", Long.toBinaryString( value )).replace(' ', '0')+" | "+value);
     }
 
diff --git a/src/main/java/libKonogonka/Tools/NPDM/ACI0/FSAccessHeaderProvider.java b/src/main/java/libKonogonka/Tools/NPDM/ACI0/FSAccessHeaderProvider.java
index da69d0e..114fe69 100644
--- a/src/main/java/libKonogonka/Tools/NPDM/ACI0/FSAccessHeaderProvider.java
+++ b/src/main/java/libKonogonka/Tools/NPDM/ACI0/FSAccessHeaderProvider.java
@@ -27,14 +27,14 @@ import java.util.Arrays;
  * */
 public class FSAccessHeaderProvider {
 
-    private byte version;
-    private byte[] padding;
-    private long permissionsBitmask;
-    private int dataSize;
-    private int contentOwnIdSectionSize;
-    private int dataNownerSizes;
-    private int saveDataOwnSectionSize;
-    private byte[] unknownData;
+    private final byte version;
+    private final byte[] padding;
+    private final long permissionsBitmask;
+    private final int dataSize;
+    private final int contentOwnIdSectionSize;
+    private final int dataOwnerSizes;
+    private final int saveDataOwnSectionSize;
+    private final byte[] unknownData;
 
     public FSAccessHeaderProvider(byte[] bytes) {
         version = bytes[0];
@@ -42,7 +42,7 @@ public class FSAccessHeaderProvider {
         permissionsBitmask = Converter.getLElong(bytes, 0x4);
         dataSize = Converter.getLEint(bytes, 0xC);
         contentOwnIdSectionSize = Converter.getLEint(bytes, 0x10);
-        dataNownerSizes = Converter.getLEint(bytes, 0x14);
+        dataOwnerSizes = Converter.getLEint(bytes, 0x14);
         saveDataOwnSectionSize = Converter.getLEint(bytes, 0x18);
         unknownData = Arrays.copyOfRange(bytes, 0x1C, bytes.length);
     }
@@ -52,7 +52,7 @@ public class FSAccessHeaderProvider {
     public long getPermissionsBitmask() { return permissionsBitmask; }
     public int getDataSize() { return dataSize; }
     public int getContentOwnIdSectionSize() { return contentOwnIdSectionSize; }
-    public int getDataNownerSizes() { return dataNownerSizes; }
+    public int getDataNownerSizes() { return dataOwnerSizes; }
     public int getSaveDataOwnSectionSize() { return saveDataOwnSectionSize; }
     public byte[] getUnknownData() { return unknownData; }
 }
diff --git a/src/main/java/libKonogonka/Tools/NPDM/NPDMProvider.java b/src/main/java/libKonogonka/Tools/NPDM/NPDMProvider.java
index 3005060..8511370 100644
--- a/src/main/java/libKonogonka/Tools/NPDM/NPDMProvider.java
+++ b/src/main/java/libKonogonka/Tools/NPDM/NPDMProvider.java
@@ -32,26 +32,26 @@ import static libKonogonka.Converter.*;
 
 public class NPDMProvider extends ASuperInFileProvider {
 
-    private String magicNum;
-    private byte[] reserved1;
-    private byte MMUFlags;
-    private byte reserved2;
-    private byte mainThreadPrio;
-    private byte mainThreadCoreNum;
-    private byte[] reserved3;
-    private int personalMmHeapSize;     // safe-to-store
-    private int version;                // safe?
-    private long mainThreadStackSize;    // TODO: check if safe
-    private String titleName;
-    private byte[] productCode;
-    private byte[] reserved4;
-    private int aci0offset;            // originally 4-bytes (u-int)
-    private int aci0size;              // originally 4-bytes (u-int)
-    private int acidOffset;            // originally 4-bytes (u-int)
-    private int acidSize;              // originally 4-bytes (u-int)
+    private final String magicNum;
+    private final byte[] reserved1;
+    private final byte MMUFlags;
+    private final byte reserved2;
+    private final byte mainThreadPrio;
+    private final byte mainThreadCoreNum;
+    private final byte[] reserved3;
+    private final int personalMmHeapSize;     // safe-to-store
+    private final int version;                // safe?
+    private final long mainThreadStackSize;    // TODO: check if safe
+    private final String titleName;
+    private final byte[] productCode;
+    private final byte[] reserved4;
+    private final int aci0offset;            // originally 4-bytes (u-int)
+    private final int aci0size;              // originally 4-bytes (u-int)
+    private final int acidOffset;            // originally 4-bytes (u-int)
+    private final int acidSize;              // originally 4-bytes (u-int)
 
-    private ACI0Provider aci0;
-    private ACIDProvider acid;
+    private final ACI0Provider aci0;
+    private final ACIDProvider acid;
 
     public NPDMProvider(PipedInputStream pis) throws Exception{
         byte[] mainBuf = new byte[0x80];
diff --git a/src/main/java/libKonogonka/Tools/NSO/NSO0Provider.java b/src/main/java/libKonogonka/Tools/NSO/NSO0Provider.java
new file mode 100644
index 0000000..0c9fba7
--- /dev/null
+++ b/src/main/java/libKonogonka/Tools/NSO/NSO0Provider.java
@@ -0,0 +1,204 @@
+/*
+    Copyright 2018-2022 Dmitry Isaenko
+     
+    This file is part of libKonogonka.
+
+    libKonogonka 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 3 of the License, or
+    (at your option) any later version.
+
+    libKonogonka 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 libKonogonka.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package libKonogonka.Tools.NSO;
+
+import libKonogonka.Converter;
+import libKonogonka.RainbowDump;
+import libKonogonka.ctraes.InFileStreamProducer;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+
+import static libKonogonka.Converter.getLEint;
+
+public class NSO0Provider {
+    private final static Logger log = LogManager.getLogger(NSO0Provider.class);
+
+    private final InFileStreamProducer producer;
+
+    private String magic;
+    private int version;
+    private byte[] upperReserved;
+    private int flags;
+    private SegmentHeader textSegmentHeader;
+    private int moduleNameOffset;   // note: could be unsigned int; consider 'long'
+    private SegmentHeader rodataSegmentHeader;
+    private int moduleNameSize;
+    private SegmentHeader dataSegmentHeader;
+    private int bssSize;            // note: could be unsigned int; consider 'long'
+    private byte[] moduleId;
+    private int textCompressedSize;
+    private int rodataCompressedSize;
+    private int dataCompressedSize;
+    private byte[] bottomReserved;
+    private SegmentHeaderRelative _api_infoRelative;
+    private SegmentHeaderRelative _dynstrRelative;
+    private SegmentHeaderRelative _dynsymRelative;
+    private byte[] textHash;
+    private byte[] rodataHash;
+    private byte[] dataHash;
+
+    /* Encrypted */
+    public NSO0Provider(InFileStreamProducer producer) throws Exception {
+        this.producer = producer;
+        try (BufferedInputStream stream = producer.produce()){
+            byte[] knownStartingBytes = new byte[0x100];
+            if (0x100 != stream.read(knownStartingBytes))
+                throw new Exception("Reading stream suddenly ended while trying to read starting 0x100 bytes");
+            parse(knownStartingBytes);
+        }
+    }
+
+    /* Not Encrypted */
+    public NSO0Provider(File file) throws Exception{
+        this(file, 0);
+    }
+    public NSO0Provider(File file, long offsetPosition) throws Exception {
+        this.producer = new InFileStreamProducer(file, offsetPosition);
+        try (BufferedInputStream stream = producer.produce()){
+            if (offsetPosition != stream.skip(offsetPosition))
+                throw new Exception("Can't skip bytes prior NSO0 offset");
+
+            byte[] knownStartingBytes = new byte[0x100];
+            if (0x100 != stream.read(knownStartingBytes))
+                throw new Exception("Reading stream suddenly ended while trying to read starting 0x100 bytes");
+            parse(knownStartingBytes);
+        }
+    }
+    private void parse(byte[] knownStartingBytes) throws Exception{
+        this.magic = new String(knownStartingBytes, 0x0, 0x4, StandardCharsets.US_ASCII);
+        if (! magic.equals("NSO0")){
+            throw new Exception("Bad magic");
+        }
+
+        this.version = getLEint(knownStartingBytes, 0x4);
+        this.upperReserved = Arrays.copyOfRange(knownStartingBytes, 0x8, 0xC);
+        this.flags = getLEint(knownStartingBytes, 0xC);
+        this.textSegmentHeader = new SegmentHeader(knownStartingBytes, 0x10);
+        this.moduleNameOffset = Converter.getLEint(knownStartingBytes, 0x1C);
+        this.rodataSegmentHeader = new SegmentHeader(knownStartingBytes, 0x20);
+        this.moduleNameSize = Converter.getLEint(knownStartingBytes, 0x2C);
+        this.dataSegmentHeader = new SegmentHeader(knownStartingBytes, 0x30);
+        this.bssSize = Converter.getLEint(knownStartingBytes, 0x3C);
+        this.moduleId = Arrays.copyOfRange(knownStartingBytes, 0x40, 0x60);
+        this.textCompressedSize = Converter.getLEint(knownStartingBytes, 0x60);
+        this.rodataCompressedSize = Converter.getLEint(knownStartingBytes, 0x64);
+        this.dataCompressedSize = Converter.getLEint(knownStartingBytes, 0x68);
+        this.bottomReserved = Arrays.copyOfRange(knownStartingBytes, 0x6C, 0x88);
+        this._api_infoRelative = new SegmentHeaderRelative(knownStartingBytes, 0x88);
+        this._dynstrRelative = new SegmentHeaderRelative(knownStartingBytes, 0x90);
+        this._dynsymRelative = new SegmentHeaderRelative(knownStartingBytes, 0x98);
+        this.textHash = Arrays.copyOfRange(knownStartingBytes, 0xA0, 0xC0);
+        this.rodataHash = Arrays.copyOfRange(knownStartingBytes, 0xC0, 0xE0);
+        this.dataHash = Arrays.copyOfRange(knownStartingBytes, 0xE0, 0x100);
+    }
+
+    public void exportAsDecompressedNSO0(String saveToLocation) throws Exception{
+        NSO0Unpacker.unpack(this, producer, saveToLocation);
+    }
+
+    /* API */
+    public String getMagic() { return magic; }
+    public int getVersion() {return version; }
+    public byte[] getUpperReserved() { return upperReserved; }
+    public int getFlags() { return flags; }
+    public boolean isTextCompressFlag(){ return (flags & 0b000001) == 1; }
+    public boolean isRoCompressFlag(){ return (flags & 0b000010) >> 1 == 1; }
+    public boolean isDataCompressFlag(){ return (flags & 0b000100 ) >> 2 == 1; }
+    public boolean isTextHashFlag(){ return (flags & 0b001000 ) >> 3 == 1; }
+    public boolean isRoHashFlag(){ return (flags & 0b010000 ) >> 4 == 1; }
+    public boolean isDataHashFlag(){ return (flags & 0b100000 ) >> 5 == 1; }
+    public SegmentHeader getTextSegmentHeader() { return textSegmentHeader; }
+    public int getModuleNameOffset() { return moduleNameOffset; }
+    public SegmentHeader getRodataSegmentHeader() { return rodataSegmentHeader; }
+    public int getModuleNameSize() { return moduleNameSize; }
+    public SegmentHeader getDataSegmentHeader() { return dataSegmentHeader; }
+    public int getBssSize() { return bssSize; }
+    public byte[] getModuleId() { return moduleId; }
+    public int getTextCompressedSize() { return textCompressedSize; }
+    public int getRodataCompressedSize() { return rodataCompressedSize; }
+    public int getDataCompressedSize() { return dataCompressedSize; }
+    public byte[] getBottomReserved() { return bottomReserved; }
+    public SegmentHeaderRelative get_api_infoRelative() { return _api_infoRelative; }
+    public SegmentHeaderRelative get_dynstrRelative() { return _dynstrRelative; }
+    public SegmentHeaderRelative get_dynsymRelative() { return _dynsymRelative; }
+    public byte[] getTextHash() { return textHash; }
+    public byte[] getRodataHash() { return rodataHash; }
+    public byte[] getDataHash() { return dataHash; }
+
+    public void printDebug(){
+        log.debug(".:: NSO0 Provider ::.\n" +
+                " ============================================================= \n" +
+                "Magic \"NSO0\"                                     " + magic + "\n" +
+                "Version (always 0)                               " + version + "\n" +
+                "Reserved                                         " + Converter.byteArrToHexString(upperReserved) + "\n" +
+                "Flags                                            " + Converter.intToBinaryString(flags)  + "\n" +
+                "  |- 0.   .text Compress                         " + isTextCompressFlag() + "\n" +
+                "  |- 1.   .rodata Compress                       " + isRoCompressFlag() + "\n" +
+                "  |- 2.   .data Compress                         " + isDataCompressFlag() + "\n" +
+                "  |- 3.   .text Hash                             " + isTextHashFlag() + "\n" +
+                "  |- 4.   .rodata Hash                           " + isRoHashFlag() + "\n" +
+                "  |- 5.   .data Hash                             " + isDataHashFlag() + "\n" +
+                "                                     +++\n"+
+                "SegmentHeader for .text\n" +
+                "    |-  File Offset - - - - - - - - - - - - - -  "+ RainbowDump.formatDecHexString(textSegmentHeader.getSegmentOffset()) + "\n" +
+                "    |-  Memory Offset - - - - - - - - - - - - -  "+ RainbowDump.formatDecHexString(textSegmentHeader.getMemoryOffset()) + "\n" +
+                "    |-  Size As Decompressed  - - - - - - - - -  "+ RainbowDump.formatDecHexString(textSegmentHeader.getSizeAsDecompressed()) + "\n" +
+                "ModuleNameOffset (calculated by sizeof(header))  " + RainbowDump.formatDecHexString(moduleNameOffset) + "\n" +
+                "                                     +++\n"+
+                "SegmentHeader for .rodata\n" +
+                "    |-  File Offset - - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(rodataSegmentHeader.getSegmentOffset()) + "\n" +
+                "    |-  Memory Offset - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(rodataSegmentHeader.getMemoryOffset()) + "\n" +
+                "    |-  Size As Decompressed  - - - - - - - - -  " + RainbowDump.formatDecHexString(rodataSegmentHeader.getSizeAsDecompressed()) + "\n" +
+                "ModuleNameSize                                   " + RainbowDump.formatDecHexString(moduleNameSize) + "\n" +
+                "                                     +++\n"+
+                "SegmentHeader for .data\n" +
+                "    |-  File Offset - - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(dataSegmentHeader.getSegmentOffset()) + "\n" +
+                "    |-  Memory Offset - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(dataSegmentHeader.getMemoryOffset()) + "\n" +
+                "    |-  Size As Decompressed  - - - - - - - - -  " + RainbowDump.formatDecHexString(dataSegmentHeader.getSizeAsDecompressed()) + "\n" +
+                "  .bss Size                                      " + RainbowDump.formatDecHexString(bssSize) + "\n" + // Block Started by Symbol
+                "Module ID (aka Build ID)                         " + Converter.byteArrToHexString(moduleId) + "\n" +
+                "  .text Size (compressed)                        " + RainbowDump.formatDecHexString(textCompressedSize) + "\n" +
+                "  .rodata Size (compressed)                      " + RainbowDump.formatDecHexString(rodataCompressedSize) + "\n" +
+                "  .data Size (compressed)                        " + RainbowDump.formatDecHexString(dataCompressedSize) + "\n" +
+                "Reserved                                         " + Converter.byteArrToHexString(bottomReserved) + "\n" +
+                "                                     xxx\n"+
+                "SegmentHeaderRelative for .api_info\n" +
+                "    |-  Offset  - - - - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(_api_infoRelative.getOffset()) + "\n" +
+                "    |-  Size  - - - - - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(_api_infoRelative.getSize()) + "\n" +
+                "                                     xxx\n"+
+                "SegmentHeaderRelative for .dynstr\n" +
+                "    |-  Offset  - - - - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(_dynstrRelative.getOffset()) + "\n" +
+                "    |-  Size  - - - - - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(_dynstrRelative.getSize()) + "\n" +
+                "                                     xxx\n"+
+                "SegmentHeaderRelative for .dynsym\n" +
+                "    |-  Offset  - - - - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(_dynsymRelative.getOffset()) + "\n" +
+                "    |-  Size  - - - - - - - - - - - - - - - - -  " + RainbowDump.formatDecHexString(_dynsymRelative.getSize()) + "\n" +
+                "                                     xxx\n"+
+                ".text decompressed' SHA-256 hash                 " + Converter.byteArrToHexString(textHash) + "\n" +
+                ".rodata decompressed' SHA-256 hash               " + Converter.byteArrToHexString(rodataHash) + "\n" +
+                ".data decompressed' SHA-256 hash                 " + Converter.byteArrToHexString(dataHash) + "\n" +
+                " ============================================================= "
+        );
+    }
+}
diff --git a/src/main/java/libKonogonka/Tools/NSO/NSO0Unpacker.java b/src/main/java/libKonogonka/Tools/NSO/NSO0Unpacker.java
new file mode 100644
index 0000000..1e61e66
--- /dev/null
+++ b/src/main/java/libKonogonka/Tools/NSO/NSO0Unpacker.java
@@ -0,0 +1,221 @@
+/*
+    Copyright 2018-2022 Dmitry Isaenko
+     
+    This file is part of libKonogonka.
+
+    libKonogonka 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 3 of the License, or
+    (at your option) any later version.
+
+    libKonogonka 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 libKonogonka.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package libKonogonka.Tools.NSO;
+
+import libKonogonka.ctraes.InFileStreamProducer;
+import net.jpountz.lz4.LZ4Factory;
+import net.jpountz.lz4.LZ4SafeDecompressor;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.RandomAccessFile;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+
+public class NSO0Unpacker {
+    private static final String DECOMPRESSED_FILE_NAME = "main_decompressed";
+    private final MessageDigest digest = MessageDigest.getInstance("SHA-256");
+
+    private NSO0Provider provider;
+    private InFileStreamProducer producer;
+
+    private byte[] _textDecompressedSection;
+    private byte[] _rodataDecompressedSection;
+    private byte[] _dataDecompressedSection;
+    private byte[] header;
+    private int textFileOffsetNew;
+    private int rodataFileOffsetNew;
+    private int dataFileOffsetNew;
+
+    private NSO0Unpacker() throws NoSuchAlgorithmException { }
+
+    public static void unpack(NSO0Provider provider, InFileStreamProducer producer, String saveToLocation) throws Exception{
+        if (! provider.isTextCompressFlag() && ! provider.isRoCompressFlag() && ! provider.isDataCompressFlag())
+            throw new Exception("This file is not compressed");
+
+        NSO0Unpacker instance = new NSO0Unpacker();
+        instance.provider = provider;
+        instance.producer = producer;
+
+        instance.decompressSections();
+        instance.validateHashes();
+        instance.makeHeader();
+        instance.writeFile(saveToLocation);
+    }
+
+    private void decompressSections() throws Exception{
+        decompressTextSection();
+        decompressRodataSection();
+        decompressDataSection();
+    }
+    private void decompressTextSection() throws Exception{
+        if (provider.isTextCompressFlag())
+            _textDecompressedSection = decompressSection(provider.getTextSegmentHeader(), provider.getTextCompressedSize());
+        else
+            _textDecompressedSection = duplicateSection(provider.getTextSegmentHeader());
+    }
+    private void decompressRodataSection() throws Exception{
+        if (provider.isRoCompressFlag())
+            _rodataDecompressedSection = decompressSection(provider.getRodataSegmentHeader(), provider.getRodataCompressedSize());
+        else
+            _rodataDecompressedSection = duplicateSection(provider.getRodataSegmentHeader());
+    }
+    private void decompressDataSection() throws Exception{
+        if (provider.isDataCompressFlag())
+            _dataDecompressedSection = decompressSection(provider.getDataSegmentHeader(), provider.getDataCompressedSize());
+        else
+            _dataDecompressedSection = duplicateSection(provider.getDataSegmentHeader());
+    }
+
+    private byte[] decompressSection(SegmentHeader segmentHeader, int compressedSectionSize) throws Exception{
+        try (BufferedInputStream stream = producer.produce()) {
+            int sectionDecompressedSize = segmentHeader.getSizeAsDecompressed();
+
+            byte[] compressed = new byte[compressedSectionSize];
+            if (segmentHeader.getSegmentOffset() != stream.skip(segmentHeader.getSegmentOffset()))
+                throw new Exception("Failed to skip " + segmentHeader.getSegmentOffset() + " bytes till section");
+
+            if (compressedSectionSize != stream.read(compressed))
+                throw new Exception("Failed to read entire section");
+
+            LZ4Factory factory = LZ4Factory.fastestInstance();
+            LZ4SafeDecompressor decompressor = factory.safeDecompressor();
+            byte[] restored = new byte[sectionDecompressedSize];
+            int decompressedLength = decompressor.decompress(compressed, 0, compressedSectionSize, restored, 0);
+
+            if (decompressedLength != sectionDecompressedSize)
+                throw new Exception("Decompression failure. Expected vs. actual decompressed sizes mismatch: " +
+                        decompressedLength + " / " + sectionDecompressedSize);
+            return restored;
+        }
+    }
+
+    private byte[] duplicateSection(SegmentHeader segmentHeader) throws Exception{
+        try (BufferedInputStream stream = producer.produce()) {
+            int size = segmentHeader.getSizeAsDecompressed();
+
+            byte[] sectionContent = new byte[size];
+            if (segmentHeader.getSegmentOffset() != stream.skip(segmentHeader.getSegmentOffset()))
+                throw new Exception("Failed to skip " + segmentHeader.getSegmentOffset() + " bytes till section");
+
+            if (size != stream.read(sectionContent))
+                throw new Exception("Failed to read entire section");
+
+            return sectionContent;
+        }
+    }
+
+    private void validateHashes() throws Exception{
+        if ( ! Arrays.equals(provider.getTextHash(), digest.digest(_textDecompressedSection)) ) {
+            throw new Exception(".text hash mismatch for .text section");
+        }
+        if ( ! Arrays.equals(provider.getRodataHash(), digest.digest(_rodataDecompressedSection)) ) {
+            throw new Exception(".rodata hash mismatch for .text section");
+        }
+        if ( ! Arrays.equals(provider.getDataHash(), digest.digest(_dataDecompressedSection)) ) {
+            throw new Exception(".data hash mismatch for .text section");
+        }
+    }
+
+    private void makeHeader() throws Exception{
+        try (BufferedInputStream stream = producer.produce()) {
+            byte[] headerBytes = new byte[0x100];
+
+            if (0x100 != stream.read(headerBytes))
+                throw new Exception("Unable to read initial 0x100 bytes needed for export.");
+/*  Simplified for computing however made hard for updating. Consider removing.
+            ByteBuffer resultingHeader = ByteBuffer.wrap(headerBytes).order(ByteOrder.LITTLE_ENDIAN);
+            ((Buffer) resultingHeader).position(0xC);
+            resultingHeader.putInt(provider.getFlags() & 0b111000)
+                    .putInt(provider.getTextSegmentHeader().getMemoryOffset()+0x100);
+            ((Buffer) resultingHeader).position(0x1C);
+            resultingHeader.putInt(0x100)
+                    .putInt(provider.getRodataSegmentHeader().getMemoryOffset()+0x100);
+            ((Buffer) resultingHeader).position(0x2C);
+            resultingHeader.putInt(0)
+                    .putInt(provider.getDataSegmentHeader().getMemoryOffset()+0x100);
+            ((Buffer) resultingHeader).position(0x60);
+            resultingHeader.putInt(provider.getTextSegmentHeader().getSizeAsDecompressed())
+                    .putInt(provider.getRodataSegmentHeader().getSizeAsDecompressed())
+                    .putInt(provider.getDataSegmentHeader().getSizeAsDecompressed());
+            ((Buffer) resultingHeader).flip();
+
+            header = resultingHeader.array();
+*/
+
+            textFileOffsetNew = provider.getTextSegmentHeader().getMemoryOffset()+0x100;
+            rodataFileOffsetNew = provider.getRodataSegmentHeader().getMemoryOffset()+0x100;
+            dataFileOffsetNew = provider.getDataSegmentHeader().getMemoryOffset()+0x100;
+
+            ByteBuffer resultingHeader = ByteBuffer.allocate(0x100).order(ByteOrder.LITTLE_ENDIAN);
+            resultingHeader.put("NSO0".getBytes(StandardCharsets.US_ASCII))
+                    .putInt(provider.getVersion())
+                    .put(provider.getUpperReserved())
+                    .putInt(provider.getFlags() & 0b111000)
+                    .putInt(textFileOffsetNew)
+                    .putInt(provider.getTextSegmentHeader().getMemoryOffset())
+                    .putInt(provider.getTextSegmentHeader().getSizeAsDecompressed())
+                    .putInt(0x100)
+                    .putInt(rodataFileOffsetNew)
+                    .putInt(provider.getRodataSegmentHeader().getMemoryOffset())
+                    .putInt(provider.getRodataSegmentHeader().getSizeAsDecompressed())
+                    .putInt(0)
+                    .putInt(dataFileOffsetNew)
+                    .putInt(provider.getDataSegmentHeader().getMemoryOffset())
+                    .putInt(provider.getDataSegmentHeader().getSizeAsDecompressed())
+                    .putInt(provider.getBssSize())
+                    .put(provider.getModuleId())
+                    .putInt(provider.getTextSegmentHeader().getSizeAsDecompressed())
+                    .putInt(provider.getRodataSegmentHeader().getSizeAsDecompressed())
+                    .putInt(provider.getDataSegmentHeader().getSizeAsDecompressed())
+                    .put(provider.getBottomReserved())
+                    .putInt(provider.get_api_infoRelative().getOffset())
+                    .putInt(provider.get_api_infoRelative().getSize())
+                    .putInt(provider.get_dynstrRelative().getOffset())
+                    .putInt(provider.get_dynstrRelative().getSize())
+                    .putInt(provider.get_dynsymRelative().getOffset())
+                    .putInt(provider.get_dynsymRelative().getSize())
+                    .put(provider.getTextHash())
+                    .put(provider.getRodataHash())
+                    .put(provider.getDataHash());
+
+            header = resultingHeader.array();
+        }
+    }
+
+    private void writeFile(String saveToLocation) throws Exception{
+        File location = new File(saveToLocation);
+        location.mkdirs();
+
+        try (RandomAccessFile raf = new RandomAccessFile(saveToLocation+File.separator+DECOMPRESSED_FILE_NAME,
+                "rw")){
+            raf.write(header);
+            raf.seek(textFileOffsetNew);
+            raf.write(_textDecompressedSection);
+            raf.seek(rodataFileOffsetNew);
+            raf.write(_rodataDecompressedSection);
+            raf.seek(dataFileOffsetNew);
+            raf.write(_dataDecompressedSection);
+        }
+    }
+}
diff --git a/src/main/java/libKonogonka/Tools/NSO/SegmentHeader.java b/src/main/java/libKonogonka/Tools/NSO/SegmentHeader.java
new file mode 100644
index 0000000..bb97e13
--- /dev/null
+++ b/src/main/java/libKonogonka/Tools/NSO/SegmentHeader.java
@@ -0,0 +1,49 @@
+/*
+    Copyright 2018-2022 Dmitry Isaenko
+     
+    This file is part of libKonogonka.
+
+    libKonogonka 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 3 of the License, or
+    (at your option) any later version.
+
+    libKonogonka 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 libKonogonka.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package libKonogonka.Tools.NSO;
+
+import libKonogonka.Converter;
+
+public class SegmentHeader {
+    private final int segmentOffset;
+    private final int memoryOffset;
+    private final int sizeAsDecompressed;
+
+    SegmentHeader(byte[] data){
+        this(data, 0);
+    }
+
+    SegmentHeader(byte[] data, int fromOffset){
+        this.segmentOffset = Converter.getLEint(data, fromOffset);
+        this.memoryOffset = Converter.getLEint(data, fromOffset+4);
+        this.sizeAsDecompressed = Converter.getLEint(data, fromOffset+8);
+    }
+
+    public int getSegmentOffset() {
+        return segmentOffset;
+    }
+
+    public int getMemoryOffset() {
+        return memoryOffset;
+    }
+
+    public int getSizeAsDecompressed() {
+        return sizeAsDecompressed;
+    }
+}
diff --git a/src/main/java/libKonogonka/Tools/NSO/SegmentHeaderRelative.java b/src/main/java/libKonogonka/Tools/NSO/SegmentHeaderRelative.java
new file mode 100644
index 0000000..e4ce826
--- /dev/null
+++ b/src/main/java/libKonogonka/Tools/NSO/SegmentHeaderRelative.java
@@ -0,0 +1,43 @@
+/*
+    Copyright 2018-2022 Dmitry Isaenko
+     
+    This file is part of libKonogonka.
+
+    libKonogonka 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 3 of the License, or
+    (at your option) any later version.
+
+    libKonogonka 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 libKonogonka.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package libKonogonka.Tools.NSO;
+
+import libKonogonka.Converter;
+
+public class SegmentHeaderRelative {
+    private final int offset;
+    private final int size;
+
+    SegmentHeaderRelative(byte[] data){
+        this(data, 0);
+    }
+
+    SegmentHeaderRelative(byte[] data, int fromOffset){
+        this.offset = Converter.getLEint(data, fromOffset);
+        this.size = Converter.getLEint(data, fromOffset+4);
+    }
+
+    public int getOffset() {
+        return offset;
+    }
+
+    public int getSize() {
+        return size;
+    }
+}
diff --git a/src/main/java/libKonogonka/Tools/PFS0/IPFS0Provider.java b/src/main/java/libKonogonka/Tools/PFS0/IPFS0Provider.java
index 0a78532..834ca60 100644
--- a/src/main/java/libKonogonka/Tools/PFS0/IPFS0Provider.java
+++ b/src/main/java/libKonogonka/Tools/PFS0/IPFS0Provider.java
@@ -19,7 +19,9 @@
 package libKonogonka.Tools.PFS0;
 
 import libKonogonka.Tools.ISuperProvider;
+import libKonogonka.ctraes.InFileStreamProducer;
 
+import java.io.FileNotFoundException;
 import java.util.LinkedList;
 
 public interface IPFS0Provider extends ISuperProvider {
@@ -32,5 +34,10 @@ public interface IPFS0Provider extends ISuperProvider {
     PFS0subFile[] getPfs0subFiles();
 
     void printDebug();
+
+    InFileStreamProducer getStreamProducer(String subFileName) throws FileNotFoundException;
+
+    InFileStreamProducer getStreamProducer(int subFileNumber);
+
     LinkedList<byte[]> getPfs0SHA256hashes();
 }
diff --git a/src/main/java/libKonogonka/Tools/PFS0/PFS0Provider.java b/src/main/java/libKonogonka/Tools/PFS0/PFS0Provider.java
index 94f5eaa..806ef93 100644
--- a/src/main/java/libKonogonka/Tools/PFS0/PFS0Provider.java
+++ b/src/main/java/libKonogonka/Tools/PFS0/PFS0Provider.java
@@ -23,6 +23,7 @@ import libKonogonka.RainbowDump;
 import libKonogonka.Tools.NCA.NCASectionTableBlock.SuperBlockPFS0;
 import libKonogonka.ctraes.AesCtrBufferedInputStream;
 import libKonogonka.ctraes.AesCtrDecryptSimple;
+import libKonogonka.ctraes.InFileStreamProducer;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -294,6 +295,31 @@ public class PFS0Provider implements IPFS0Provider{
         return true;
     }
 
+    @Override
+    public InFileStreamProducer getStreamProducer(String subFileName) throws FileNotFoundException {
+        for (int i = 0; i < pfs0subFiles.length; i++) {
+            if (pfs0subFiles[i].getName().equals(subFileName))
+                return getStreamProducer(i);
+        }
+        throw new FileNotFoundException("No file with such name exists: "+subFileName);
+    }
+    @Override
+    public InFileStreamProducer getStreamProducer(int subFileNumber) {
+        PFS0subFile subFile = pfs0subFiles[subFileNumber];
+        long subFileOffset = subFile.getOffset() + mediaStartOffset * 0x200 + rawBlockDataStart;
+
+        if (encrypted) {
+            return new InFileStreamProducer(file,
+                    pfs0subFiles[subFileNumber].getSize(),
+                    ncaOffset,
+                    subFileOffset,
+                    decryptor,
+                    mediaStartOffset,
+                    mediaEndOffset);
+        }
+        return new InFileStreamProducer(file, offsetPositionInFile, subFileOffset);
+    }
+
     /**
      * @deprecated
      * */
diff --git a/src/main/java/libKonogonka/ctraes/InFileStreamProducer.java b/src/main/java/libKonogonka/ctraes/InFileStreamProducer.java
new file mode 100644
index 0000000..8876f1e
--- /dev/null
+++ b/src/main/java/libKonogonka/ctraes/InFileStreamProducer.java
@@ -0,0 +1,119 @@
+/*
+    Copyright 2018-2022 Dmitry Isaenko
+     
+    This file is part of libKonogonka.
+
+    libKonogonka 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 3 of the License, or
+    (at your option) any later version.
+
+    libKonogonka 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 libKonogonka.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package libKonogonka.ctraes;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.nio.file.Files;
+
+// TODO: rework, simplify
+public class InFileStreamProducer {
+    private final boolean encrypted;
+    private final long size;
+
+    private final File file;
+    private final long initialOffset;
+    private long subOffset;
+    private AesCtrDecryptSimple decryptor;
+    private long mediaStartOffset;
+    private long mediaEndOffset;
+
+    public InFileStreamProducer(
+            File file,
+            long size,
+            long initialOffset,
+            long subOffset,
+            AesCtrDecryptSimple decryptor,
+            long mediaStartOffset,
+            long mediaEndOffset
+    ){
+        this.encrypted = (decryptor != null);
+        this.file = file;
+        this.size = size;
+        this.initialOffset = initialOffset;
+        this.subOffset = subOffset;
+        this.decryptor = decryptor;
+        this.mediaStartOffset = mediaStartOffset;
+        this.mediaEndOffset = mediaEndOffset;
+    }
+    public InFileStreamProducer(File file, long size, long initialOffset, long subOffset){
+        this.encrypted = false;
+        this.file = file;
+        this.size = size;
+        this.initialOffset = 0;
+        this.subOffset = initialOffset+subOffset;
+    }
+    public InFileStreamProducer(File file, long size){
+        this.encrypted = false;
+        this.file = file;
+        this.size = size;
+        this.initialOffset = 0;
+        this.subOffset = 0;
+    }
+    public InFileStreamProducer(File file, long size, long subOffset){
+        this.encrypted = false;
+        this.file = file;
+        this.size = size;
+        this.initialOffset = 0;
+        this.subOffset = subOffset;
+    }
+
+    public BufferedInputStream produce() throws Exception{
+        if (encrypted) {
+            return produceAesCtr();
+        }
+        return produceNotEncrypted();
+    }
+    private AesCtrBufferedInputStream produceAesCtr() throws Exception{
+        decryptor.reset();
+        AesCtrBufferedInputStream stream = new AesCtrBufferedInputStream(
+                decryptor,
+                initialOffset,
+                mediaStartOffset,
+                mediaEndOffset,
+                Files.newInputStream(file.toPath()));
+        if (subOffset != stream.skip(subOffset))
+            throw new Exception("Unable to skip offset: " + subOffset);
+        return stream;
+    }
+    private BufferedInputStream produceNotEncrypted() throws Exception{
+        BufferedInputStream stream = new BufferedInputStream(Files.newInputStream(file.toPath()));
+        if (subOffset != stream.skip(subOffset))
+            throw new Exception("Unable to skip offset: " + subOffset);
+        return stream;
+    }
+
+    public InFileStreamProducer getSuccessor(long subOffset, long size){
+        this.subOffset = subOffset;
+        return new InFileStreamProducer(file, size, initialOffset, subOffset, decryptor, mediaStartOffset, mediaEndOffset);
+    }
+
+    public boolean isEncrypted() {
+        return encrypted;
+    }
+
+    public long getSize() {
+        return size;
+    }
+
+    @Override
+    public String toString(){
+        return file.getName();
+    }
+}
diff --git a/src/test/java/libKonogonka/RomFsDecrypted/NSODecompressTest.java b/src/test/java/libKonogonka/RomFsDecrypted/NSODecompressTest.java
new file mode 100644
index 0000000..7139bba
--- /dev/null
+++ b/src/test/java/libKonogonka/RomFsDecrypted/NSODecompressTest.java
@@ -0,0 +1,43 @@
+/*
+    Copyright 2018-2022 Dmitry Isaenko
+     
+    This file is part of libKonogonka.
+
+    libKonogonka 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 3 of the License, or
+    (at your option) any later version.
+
+    libKonogonka 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 libKonogonka.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package libKonogonka.RomFsDecrypted;
+
+import libKonogonka.Tools.NSO.NSO0Provider;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.io.File;
+
+public class NSODecompressTest {
+    private static final String ncaExtractedFileLocation = "./FilesForTests/NSO0/main";
+    private static final String ncaExtractedFileLocationDec = "./FilesForTests/NSO0/main_d";
+
+    @Disabled
+    @DisplayName("NSO0 Decompression test")
+    @Test
+    void nso0DecompressionTest() throws Exception {
+        NSO0Provider nso0Provider = new NSO0Provider(new File(ncaExtractedFileLocation));
+        //nso0Provider.exportAsDecompressedNSO0("./FilesForTests/NSO0");
+        nso0Provider.printDebug();
+
+        NSO0Provider nso0Provider1 = new NSO0Provider(new File(ncaExtractedFileLocationDec));
+        nso0Provider1.printDebug();
+    }
+}
diff --git a/src/test/java/libKonogonka/RomFsDecrypted/NSOTest.java b/src/test/java/libKonogonka/RomFsDecrypted/NSOTest.java
new file mode 100644
index 0000000..bf6b276
--- /dev/null
+++ b/src/test/java/libKonogonka/RomFsDecrypted/NSOTest.java
@@ -0,0 +1,129 @@
+/*
+    Copyright 2018-2022 Dmitry Isaenko
+     
+    This file is part of libKonogonka.
+
+    libKonogonka 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 3 of the License, or
+    (at your option) any later version.
+
+    libKonogonka 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 libKonogonka.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package libKonogonka.RomFsDecrypted;
+
+import libKonogonka.KeyChainHolder;
+import libKonogonka.RainbowDump;
+import libKonogonka.Tools.NCA.NCAProvider;
+import libKonogonka.Tools.NSO.NSO0Provider;
+import libKonogonka.Tools.PFS0.IPFS0Provider;
+import libKonogonka.Tools.PFS0.PFS0subFile;
+import libKonogonka.ctraes.AesCtrDecryptSimple;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.io.*;
+import java.nio.file.Files;
+
+public class NSOTest {
+    private static final String keysFileLocation = "./FilesForTests/prod.keys";
+    private static final String xci_header_keyFileLocation = "./FilesForTests/xci_header_key.txt";
+    private static final String ncaFileLocation = "./FilesForTests/nso_container.nca";
+    private static KeyChainHolder keyChainHolder;
+    private static NCAProvider ncaProvider;
+
+
+    @Disabled
+    @DisplayName("NSO0 test")
+    @Test
+    void nso0Test() throws Exception{
+        BufferedReader br = new BufferedReader(new FileReader(xci_header_keyFileLocation));
+        String keyValue = br.readLine();
+        br.close();
+
+        if (keyValue == null)
+            throw new Exception("Unable to retrieve xci_header_key");
+
+        keyValue = keyValue.trim();
+        keyChainHolder = new KeyChainHolder(keysFileLocation, keyValue);
+
+        ncaProvider = new NCAProvider(new File(ncaFileLocation), keyChainHolder.getRawKeySet());
+
+        pfs0Validation();
+
+        nso0Validation();
+        // AesCtrBufferedInputStreamTest();
+    }
+
+    void pfs0Validation() throws Exception{
+        for (byte i = 0; i < 4; i++){
+            System.out.println("..:: TEST SECTION #"+i+" ::..");
+            if (ncaProvider.getSectionBlock(i).getFsType() == 1 &&
+                    ncaProvider.getSectionBlock(i).getHashType() == 2 &&
+                    ncaProvider.getSectionBlock(i).getCryptoType() == 3){
+                ncaProvider.getNCAContentProvider(i).getPfs0().printDebug();
+                ncaProvider.getSectionBlock(i).printDebug();
+                return;
+            }
+        }
+    }
+
+    long ACBISoffsetPosition;
+    long ACBISmediaStartOffset;
+    long ACBISmediaEndOffset;
+
+    long offsetPosition;
+
+
+    void nso0Validation() throws Exception{
+        File nca = new File(ncaFileLocation);
+        PFS0subFile[] subfiles = ncaProvider.getNCAContentProvider(0).getPfs0().getPfs0subFiles();
+
+        offsetPosition = ncaProvider.getTableEntry0().getMediaStartOffset()*0x200 +
+                ncaProvider.getNCAContentProvider(0).getPfs0().getRawFileDataStart();
+        System.out.println("\t=============================================================");
+        System.out.println("\tNCA SIZE:                         "+ RainbowDump.formatDecHexString(nca.length()));
+        System.out.println("\tPFS0 Offset(get)                  "+RainbowDump.formatDecHexString(ncaProvider.getSectionBlock0().getSuperBlockPFS0().getPfs0offset()));
+        System.out.println("\tPFS0 MediaStart (* 0x200)         "+RainbowDump.formatDecHexString(ncaProvider.getTableEntry0().getMediaStartOffset()*0x200));
+        System.out.println("\tPFS0 MediaEnd (* 0x200)           "+RainbowDump.formatDecHexString(ncaProvider.getTableEntry0().getMediaEndOffset()*0x200));
+        System.out.println("\tPFS0 Offset+MediaBlockStart:      "+RainbowDump.formatDecHexString(offsetPosition));
+        System.out.println("\tRAW  Offset:                      "+RainbowDump.formatDecHexString(ncaProvider.getNCAContentProvider(0).getPfs0().getRawFileDataStart()));
+        System.out.println("\tHashTableSize:                    "+RainbowDump.formatDecHexString(ncaProvider.getSectionBlock0().getSuperBlockPFS0().getHashTableSize()));
+        for (PFS0subFile subFile : subfiles){
+            System.out.println("\n\tEntry Name:                       "+subFile.getName());
+            System.out.println("\tEntry Offset:                     "+RainbowDump.formatDecHexString(subFile.getOffset()));
+            System.out.println("\tEntry Size:                       "+RainbowDump.formatDecHexString(subFile.getSize()));
+        }
+        System.out.println("\t=============================================================");
+
+        ACBISoffsetPosition = 0;
+        ACBISmediaStartOffset = ncaProvider.getTableEntry0().getMediaStartOffset();
+        ACBISmediaEndOffset = ncaProvider.getTableEntry0().getMediaEndOffset();
+
+        AesCtrDecryptSimple decryptSimple = new AesCtrDecryptSimple(
+                ncaProvider.getDecryptedKey2(),
+                ncaProvider.getSectionBlock0().getSectionCTR(),
+                ncaProvider.getTableEntry0().getMediaStartOffset() * 0x200);
+
+        IPFS0Provider pfs0Provider = ncaProvider.getNCAContentProvider(0).getPfs0();
+
+        NSO0Provider nso0Provider = new NSO0Provider(pfs0Provider.getStreamProducer(0));
+        nso0Provider.printDebug();
+
+        // NPDMProvider npdmProvider = new NPDMProvider(pfs0Provider.getProviderSubFilePipedInpStream(1));
+
+        System.out.println("__--++ SDK VERSION ++--__\n"
+                +ncaProvider.getSdkVersion()[3]
+                +"."+ncaProvider.getSdkVersion()[2]
+                +"."+ncaProvider.getSdkVersion()[1]
+                +"."+ncaProvider.getSdkVersion()[0]);
+
+    }
+}