#if !(UNITY_IOS || UNITY_IPHONE)
using System;
using System.Runtime.InteropServices;
using UnityEngine;
using System.Collections.Generic;
using System.IO;


#if (UNITY_WSA_8_1 || UNITY_WP_8_1 || UNITY_WINRT_8_1) && !UNITY_EDITOR
 using File = UnityEngine.Windows.File;
#else
using File = System.IO.File;
#endif

#if NETFX_CORE
#if UNITY_WSA_10_0
		using System.IO.IsolatedStorage;
		using static System.IO.Directory;
		using static System.IO.File;
		using static System.IO.FileStream;
#endif
#endif


public class lzma
{

    //if you want to be able to call the functions: get7zinfo, get7zSize, decode2Buffer from a thread set this string before to the Application.persistentDataPath !
    public static string persitentDataPath = "";

#if !(UNITY_WSA || UNITY_WP_8_1) || UNITY_EDITOR

    internal static int[] props = new int[7];
    internal static bool defaultsSet = false;

    //0 = level, /* 0 <= level <= 9, default = 5 */
    //1 = dictSize, /* use (1 << N) or (3 << N). 4 KB < dictSize <= 128 MB */
    //2 = lc, /* 0 <= lc <= 8, default = 3  */
    //3 = lp, /* 0 <= lp <= 4, default = 0  */
    //4 = pb, /* 0 <= pb <= 4, default = 2  */
    //5 = fb,  /* 5 <= fb <= 273, default = 32 */
    //6 = numThreads /* 1 or 2, default = 2 */

    //A function that sets the compression properties for the lzma compressor. Will affect the lzma alone file and the lzma buffer compression.
    //A simple usage of this function is to call it only with the 1st parameter that sets the compression level: setProps(9);
    //
    //Multithread safe advice: call this function before starting any thread operations !!!
    public static void setProps(int level = 5, int dictSize = 16777216, int lc = 3, int lp = 0, int pb = 2, int fb = 32, int numThreads = 2)
    {
        defaultsSet = true;
        props[0] = level;
        props[1] = dictSize;
        props[2] = lc;
        props[3] = lp;
        props[4] = pb;
        props[5] = fb;
        props[6] = numThreads;
    }
#endif


#if (UNITY_WEBGL) && !UNITY_EDITOR

#if (!UNITY_WEBGL)
			[DllImport("__Internal")]
			public static extern int lsetPermissions(string filePath, string _user, string _group, string _other);
			[DllImport("__Internal")]
			private static extern int decompress7zip(string filePath, string exctractionPath, bool fullPaths,  string entry, IntPtr progress, IntPtr FileBuffer, int FileBufferLength);
#endif

		[DllImport("__Internal")]
		private static extern int decompress7zip2(string filePath, string exctractionPath, bool fullPaths, string entry, IntPtr progress, IntPtr FileBuffer, int FileBufferLength);
		[DllImport("__Internal")]
		private static extern int _getSize(string filePath, string tempPath, IntPtr FileBuffer, int FileBufferLength);
		[DllImport("__Internal")]
		internal static extern int lzmaUtil(bool encode, string inPath, string outPath, IntPtr Props);
		[DllImport("__Internal")]
		internal static extern int decode2Buf(string filePath, string entry,  IntPtr buffer, IntPtr FileBuffer, int FileBufferLength);
		[DllImport("__Internal")]
		internal static extern void _releaseBuffer(IntPtr buffer);	
		[DllImport("__Internal")]
		internal static extern IntPtr Lzma_Compress( IntPtr buffer, int bufferLength, bool makeHeader, ref int v, IntPtr Props);
		[DllImport("__Internal")]
		internal static extern int Lzma_Uncompress( IntPtr buffer, int bufferLength, int uncompressedSize,  IntPtr outbuffer,bool useHeader);
#endif

#if UNITY_5_4_OR_NEWER
#if (UNITY_ANDROID || UNITY_STANDALONE_LINUX) && (!UNITY_EDITOR || UNITY_EDITOR_LINUX)
		private const string libname = "lzma";
#elif UNITY_EDITOR || UNITY_STANDALONE_WIN 
    private const string libname = "liblzma";
#endif
#else
#if (UNITY_ANDROID || UNITY_STANDALONE_LINUX) && !UNITY_EDITOR
		private const string libname = "lzma";
#endif
#if UNITY_EDITOR || UNITY_STANDALONE_WIN 
		private const string libname = "liblzma";
#endif
#endif

#if UNITY_EDITOR || UNITY_STANDALONE_WIN ||  UNITY_ANDROID || UNITY_STANDALONE_LINUX
#if ( UNITY_STANDALONE_LINUX || UNITY_ANDROID ||  UNITY_EDITOR_LINUX) && !UNITY_EDITOR_WIN
			//set permissions of a file in user, group, other. Each string should contain any or all chars of "rwx".
			//returns 0 on success
			[DllImport(libname, EntryPoint = "lsetPermissions")]
			internal static extern int lsetPermissions(string filePath, string _user, string _group, string _other);
#endif
    [DllImport(libname, EntryPoint = "decompress7zip")]
    internal static extern int decompress7zip(string filePath, string exctractionPath, bool fullPaths, string entry, IntPtr progress, IntPtr FileBuffer, int FileBufferLength);
    [DllImport(libname, EntryPoint = "decompress7zip2")]
    internal static extern int decompress7zip2(string filePath, string exctractionPath, bool fullPaths, string entry, IntPtr progress, IntPtr FileBuffer, int FileBufferLength);
    [DllImport(libname, EntryPoint = "_getSize")]
    internal static extern int _getSize(string filePath, string tempPath, IntPtr FileBuffer, int FileBufferLength);
    [DllImport(libname, EntryPoint = "lzmaUtil")]
    internal static extern int lzmaUtil(bool encode, string inPath, string outPath, IntPtr Props);
    [DllImport(libname, EntryPoint = "decode2Buf")]
    internal static extern int decode2Buf(string filePath, string entry, IntPtr buffer, IntPtr FileBuffer, int FileBufferLength);
    [DllImport(libname, EntryPoint = "_releaseBuffer")]
    internal static extern void _releaseBuffer(IntPtr buffer);
    [DllImport(libname, EntryPoint = "Lzma_Compress")]
    internal static extern IntPtr Lzma_Compress(IntPtr buffer, int bufferLength, bool makeHeader, ref int v, IntPtr Props);
    [DllImport(libname, EntryPoint = "Lzma_Uncompress")]
    internal static extern int Lzma_Uncompress(IntPtr buffer, int bufferLength, int uncompressedSize, IntPtr outbuffer, bool useHeader);
#endif

#if (UNITY_WP_8_1 || UNITY_WSA) && !UNITY_EDITOR
#if UNITY_WSA_10_0
            [DllImport("liblzma", EntryPoint = "decompress7zip")]
			internal static extern int decompress7zip(string filePath, string exctractionPath, bool fullPaths,  string entry, IntPtr progress, IntPtr FileBuffer, int FileBufferLength);
#endif
		[DllImport("liblzma", EntryPoint = "decompress7zip2")]
		internal static extern int decompress7zip2(string filePath, string exctractionPath, bool fullPaths, string entry, IntPtr progress, IntPtr FileBuffer, int FileBufferLength);
		[DllImport("liblzma", EntryPoint = "_getSize")]
		internal static extern int _getSize(string filePath, string tempPath, IntPtr FileBuffer, int FileBufferLength);
		[DllImport("liblzma", EntryPoint = "decode2Buf")]
		internal static extern int decode2Buf(string filePath, string entry,  IntPtr buffer, IntPtr FileBuffer, int FileBufferLength);
		[DllImport("liblzma", EntryPoint = "Lzma_Uncompress")]
		internal static extern int Lzma_Uncompress( IntPtr buffer, int bufferLength, int uncompressedSize, IntPtr outbuffer,bool useHeader);
#endif


    // set permissions of a file in user, group, other.
    // Each string should contain any or all chars of "rwx".
    // returns 0 on success
    public static int setFilePermissions(string filePath, string _user, string _group, string _other)
    {
#if (UNITY_STANDALONE_LINUX || UNITY_ANDROID ||  UNITY_EDITOR_LINUX) && !UNITY_EDITOR_WIN
			return lsetPermissions(filePath, _user, _group, _other);
#else
        return -1;
#endif
    }

    // An integer variable to store the total number of files in a 7z archive, excluding the folders.
    public static int trueTotalFiles = 0;

    //ERROR CODES:
    //  1 : OK
    //	2 : Could not find requested file in archive
    // -1 : Could not open input(7z) file
    // -2 : Decoder doesn't support this archive
    // -3 : Can not allocate memory
    // -4 : CRC error of 7z file
    // -5 : Unknown error
    // -6 : Can not open output file (usually when the path to write to, is invalid)
    // -7 : Can not write output file
    // -8 : Can not close output file

    //The most common use of this library is to download a 7z file in your Application.persistentDataPath directory
    //and decompress it in a folder that you want.

    //int lz=lzma.doDecompress7zip(Application.persistentDataPath+"/myCompresedFile.7z",Application.persistentDataPath+"/myUncompressedFiles/");

    //WSA8.1 does not support large files.

    //filePath			: the full path to the archive, including the archives name. (/myPath/myArchive.7z)
    //exctractionPath	: the path in where you want your files to be extracted
    //progress          : a single item integer array to get the progress of the extracted files (use this function when calling from a separate thread, otherwise call the 2nd implementation)
    //                  : (for ios this integer is not properly updated. So we use the lzma.getProgressCount() function to get the progress. See example.)
    //largeFiles		: set this to true if you are extracting files larger then 30-40 Mb. It is slower though but prevents crashing your app when extracting large files!
    //fullPaths			: set this to true if you want to keep the folder structure of the 7z file.
    //entry				: set the name of a single file file you want to extract from your archive. If the file resides in a folder, the full path should be added.
    //					   (for example  game/meshes/small/table.mesh )
    //FileBuffer		: A buffer that holds a 7zip file. When assigned the function will decompress from this buffer and will ignore the filePath. (Linux, iOS, Android, MacOSX)
    //use this function from a separate thread to get the progress  of the extracted files in the referenced 'progress' integer.
    //
    public static int doDecompress7zip(string filePath, string exctractionPath, int[] progress, bool largeFiles = false, bool fullPaths = false, string entry = null, byte[] FileBuffer = null)
    {

        int res = 0;
        GCHandle ibuf = GCHandle.Alloc(progress, GCHandleType.Pinned);

#if (UNITY_ANDROID || UNITY_STANDALONE_LINUX || UNITY_EDITOR) && !UNITY_EDITOR_WIN

		if(FileBuffer != null) {
			GCHandle fbuf = GCHandle.Alloc(FileBuffer, GCHandleType.Pinned);
			
				
			if (largeFiles){
				res = decompress7zip(null, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject() , fbuf.AddrOfPinnedObject(), FileBuffer.Length);
			}else{
				res =  decompress7zip2(null, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject() , fbuf.AddrOfPinnedObject(), FileBuffer.Length);
			}
				fbuf.Free(); ibuf.Free(); return res;
		} else {
			if (largeFiles){
				res = decompress7zip(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject() , IntPtr.Zero, 0);
				ibuf.Free(); return res;
			}else{
				res = decompress7zip2(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject() , IntPtr.Zero, 0);
				ibuf.Free(); return res;
			}
		}
		
#endif

#if (!UNITY_WSA && !UNITY_WEBGL && !UNITY_STANDALONE_LINUX && !UNITY_ANDROID) || UNITY_EDITOR_WIN || UNITY_WSA_10_0
        if (largeFiles)
        {
            res = decompress7zip(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), IntPtr.Zero, 0);
            ibuf.Free(); return res;
        }
        else
        {
            res = decompress7zip2(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), IntPtr.Zero, 0);
            ibuf.Free(); return res;
        }
#endif

#if (UNITY_WSA_8_1 || UNITY_WP_8_1 || UNITY_WINRT_8_1 || UNITY_WEBGL) && !UNITY_EDITOR
			res = decompress7zip2(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), IntPtr.Zero, 0);
			ibuf.Free(); return res;
#endif
    }

    //same as above only the progress integer is a local variable.
    //use this when you don't want to get the progress of the extracted files and when not calling the function from a separate thread.
    public static int doDecompress7zip(string filePath, string exctractionPath, bool largeFiles = false, bool fullPaths = false, string entry = null, byte[] FileBuffer = null)
    {
        //make a check if the last '/' exists at the end of the exctractionPath and add it if it is missing
        if (@exctractionPath.Substring(@exctractionPath.Length - 1, 1) != "/") { @exctractionPath += "/"; }

        int[] progress = new int[1];
        GCHandle ibuf = GCHandle.Alloc(progress, GCHandleType.Pinned);
        int res = 0;

#if (UNITY_ANDROID || UNITY_STANDALONE_LINUX || UNITY_EDITOR) && !UNITY_EDITOR_WIN
		if(FileBuffer != null) {
			GCHandle fbuf = GCHandle.Alloc(FileBuffer, GCHandleType.Pinned);
			
			
			if (largeFiles){
				res = decompress7zip(null, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), fbuf.AddrOfPinnedObject(), FileBuffer.Length);
			}else{
				res = decompress7zip2(null, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), fbuf.AddrOfPinnedObject(), FileBuffer.Length);
			}
				fbuf.Free(); ibuf.Free(); return res;
		} else {
			if (largeFiles){
				res = decompress7zip(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), IntPtr.Zero, 0);
				ibuf.Free(); return res;
			}else{
				res = decompress7zip2(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), IntPtr.Zero, 0);
				ibuf.Free(); return res;
			}
		}
#endif

#if (!UNITY_WSA && !UNITY_WEBGL && !UNITY_STANDALONE_LINUX && !UNITY_ANDROID) || UNITY_EDITOR_WIN || UNITY_WSA_10_0
        if (largeFiles)
        {
            res = decompress7zip(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), IntPtr.Zero, 0);
            ibuf.Free(); return res;
        }
        else
        {
            res = decompress7zip2(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), IntPtr.Zero, 0);
            ibuf.Free(); return res;
        }
#endif

#if (UNITY_WSA_8_1 || UNITY_WP_8_1 || UNITY_WINRT_8_1 || UNITY_WEBGL) && !UNITY_EDITOR
			res = decompress7zip2(@filePath, @exctractionPath, fullPaths, entry, ibuf.AddrOfPinnedObject(), IntPtr.Zero, 0);
			ibuf.Free(); return res;
#endif
    }


#if !(UNITY_WSA || UNITY_WP_8_1) || UNITY_EDITOR
    //ERROR CODES (for both encode/decode LzmaUtil functions):
    //   1 : OK
    // -10 : Can not read input file
    // -11 : Can not write output file
    // -12 : Can not allocate memory
    // -13 : Data error

    //This function encodes a single archive in lzma alone format.
    //inPath	: the file to be encoded. (use full path + file name)
    //outPath	: the .lzma file that will be produced. (use full path + file name)
    //
    //You can set the compression properties by calling the setProps function before.
    //setProps(9) for example will set compression evel to highest level.
    public static int LzmaUtilEncode(string inPath, string outPath)
    {
        if (!defaultsSet) setProps();
        GCHandle prps = GCHandle.Alloc(props, GCHandleType.Pinned);
        int res = lzmaUtil(true, @inPath, @outPath, prps.AddrOfPinnedObject());
        prps.Free();
        return res;
    }


    //This function decodes a single archive in lzma alone format.
    //inPath	: the .lzma file that will be decoded. (use full path + file name)
    //outPath	: the decoded file. (use full path + file name)
    public static int LzmaUtilDecode(string inPath, string outPath)
    {
        return lzmaUtil(false, @inPath, @outPath, IntPtr.Zero);
    }

#endif

    //Lists get filled with filenames (including path if the file is in a folder) and uncompressed file sizes
    public static List<string> ninfo = new List<string>();//filenames
    public static List<long> sinfo = new List<long>();//file sizes

    //this function fills the ArrayLists with the filenames and file sizes that are in the 7zip file
    //returns			: the total size in bytes of the files in the 7z archive 
    //
    //filePath			: the full path to the archive, including the archives name. (/myPath/myArchive.7z)
    //tempPath			: (optional) a temp path that will be used to write the files info (otherwise the path of the 7z archive will be used)
    //					: this is useful when your 7z archive resides in a read only location.
    //					: the tempPath should be in this form: 'dir/dir/myTempLog' with no slash in the end. The last name will be used as the log's filename.
    //FileBuffer		: A buffer that holds a 7zip file. When assigned the function will read from this buffer and will ignore the filePath. (Linux, iOS, Android, MacOSX)
    //
    //trueTotalFiles is an integer variable to store the total number of files in a 7z archive, excluding the folders.
    public static long get7zInfo(string filePath, string tempPath = null, byte[] FileBuffer = null)
    {

        ninfo.Clear(); sinfo.Clear();
        trueTotalFiles = 0;
        int res = -1;
        string logPath = "";

#if !NETFX_CORE
        if (@tempPath == null)
        {
            if (persitentDataPath.Length > 0) logPath = @persitentDataPath + "/sevenZip.log"; else logPath = @Application.persistentDataPath + "/sevenZip.log";
        }
        else { logPath = @tempPath; }
#endif
        //for WSA, logPath should always be: Application.persistentDataPath + "/sevenZip.log"; 
#if NETFX_CORE
#if UNITY_WSA_10_0
				if(persitentDataPath.Length>0) logPath = @persitentDataPath + "/sevenZip.log"; else  logPath = @Application.persistentDataPath + "/sevenZip.log";
#endif
#if UNITY_WSA_8_1 || UNITY_WP_8_1 || UNITY_WINRT_8_1
				if(persitentDataPath.Length>0) logPath = @persitentDataPath + "/sevenZip.log"; else  logPath = @UnityEngine.Windows.Directory.localFolder + "/sevenZip.log";
#endif
#endif

        if (File.Exists(logPath + ".txt")) File.Delete(logPath + ".txt");

#if (UNITY_ANDROID || UNITY_STANDALONE_LINUX || UNITY_EDITOR) && !UNITY_EDITOR_WIN
          if(FileBuffer != null) {
                GCHandle fbuf = GCHandle.Alloc(FileBuffer, GCHandleType.Pinned);
                res = _getSize(null, logPath,  fbuf.AddrOfPinnedObject(), FileBuffer.Length);
                fbuf.Free();
            }else {
                res = _getSize(@filePath, logPath,  IntPtr.Zero, 0);
            }
#else
        res = _getSize(@filePath, logPath, IntPtr.Zero, 0);
#endif

        if (res == -1) { /*Debug.Log("Input file not found.");*/ return -1; }

        if (!File.Exists(logPath + ".txt")) {/* Debug.Log("Info file not found.");*/ return -3; }

#if !NETFX_CORE
        StreamReader r = new StreamReader(logPath + ".txt");
#endif
#if NETFX_CORE
#if UNITY_WSA_10_0
			IsolatedStorageFile ipath = IsolatedStorageFile.GetUserStoreForApplication();
			StreamReader r = new StreamReader(new IsolatedStorageFileStream("sevenZip.log.txt", FileMode.Open, ipath));
#endif
#if UNITY_WSA_8_1 || UNITY_WP_8_1 || UNITY_WINRT_8_1
			var data = UnityEngine.Windows.File.ReadAllBytes(logPath + ".txt");
			string ss = System.Text.Encoding.UTF8.GetString(data,0,data.Length);
			StringReader r = new StringReader(ss);
#endif
#endif

        string line;
        string[] rtt;
        long t = 0, sum = 0;

        while ((line = r.ReadLine()) != null)
        {
            rtt = line.Split('|');
            ninfo.Add(rtt[0]);
            long.TryParse(rtt[1], out t);
            sum += t;
            sinfo.Add(t);
            if (t > 0) trueTotalFiles++;
        }

#if !NETFX_CORE
        r.Close();
#endif
        r.Dispose();
        File.Delete(logPath + ".txt");

        return sum;
    }


    //this function returns the uncompressed file size of a given file in the 7z archive if specified,
    //otherwise it will return the total uncompressed size of all the files in the archive.
    //
    //If you don't fill the filePath parameter it will assume that the get7zInfo function has already been called.
    //
    //
    //filePath			: the full path to the archive, including the archives name. (/myPath/myArchive.7z)
    // 					: if you call the function with filePath as null, it will try to find file sizes from the last call.
    //fileName 			: the file name we want to get the file size (if it resides in a folder add the folder path also)
    //tempPath			: (optional) a temp path that will be used to write the files info (otherwise the path of the 7z archive will be used)
    //					: this is useful when your 7z archive resides in a read only location.
    //					: the tempPath should be in this form: 'dir/dir/myTempLog' with no slash in the end. The last name will be used as the log's filename.
    //FileBuffer		: A buffer that holds a 7zip file. When assigned the function will read from this buffer and will ignore the filePath. (Linux, iOS, Android, MacOSX)
    public static long get7zSize(string filePath = null, string fileName = null, string tempPath = null, byte[] FileBuffer = null)
    {

        if (filePath != null)
        {
            if (get7zInfo(@filePath, @tempPath, FileBuffer) < 0) { return -1; }
        }

        if (ninfo == null)
        {
            if (ninfo.Count == 0) { return -1; }
        }

        long sum = 0;

        if (fileName != null)
        {
            for (int i = 0; i < ninfo.Count; i++)
            {
                if (ninfo[i].ToString() == fileName)
                {
                    return (long)sinfo[i];
                }
            }
        }
        else
        {
            for (int i = 0; i < ninfo.Count; i++)
            {
                sum += (long)sinfo[i];
            }
            return sum;
        }
        return -1;//nothing was found
    }



    //A function to decode a specific archive in a 7z archive to a byte buffer
    //
    //filePath		: the full path to the 7z archive 
    //entry			: the file name to decode to a buffer. If the file resides in a folder, the full path should be used.
    //tempPath		: (optional) a temp path that will be used to write the files info (otherwise the path of the 7z archive will be used)
    //				: this is useful when your 7z archive resides in a read only location.
    //				: the tempPath should be in this form: 'dir/dir/myTempLog' with no slash in the end. The last name will be used as the log's filename.
    //FileBuffer	: A buffer that holds a 7zip file. When assigned the function will read from this buffer and will ignore the filePath. (Linux, iOS, Android, MacOSX)
    public static byte[] decode2Buffer(string filePath, string entry, string tempPath = null, byte[] FileBuffer = null)
    {
        int bufs = (int)get7zSize(@filePath, entry, @tempPath, FileBuffer);
        if (bufs <= 0) return null;//entry error or it does not exist
        byte[] nb = new byte[bufs];
        int res = 0;

        GCHandle dec2buf = GCHandle.Alloc(nb, GCHandleType.Pinned);

#if (UNITY_ANDROID || UNITY_STANDALONE_LINUX || UNITY_EDITOR) && !UNITY_EDITOR_WIN
          if(FileBuffer != null) {
                GCHandle fbuf = GCHandle.Alloc(FileBuffer, GCHandleType.Pinned);
                res = decode2Buf(null, entry, dec2buf.AddrOfPinnedObject(), fbuf.AddrOfPinnedObject(), FileBuffer.Length);
                fbuf.Free();
            }else {
                res = decode2Buf(@filePath, entry, dec2buf.AddrOfPinnedObject(), IntPtr.Zero, 0);
            }
#else
        res = decode2Buf(@filePath, entry, dec2buf.AddrOfPinnedObject(), IntPtr.Zero, 0);
#endif

        dec2buf.Free();
        if (res == 1) { return nb; }
        else { nb = null; return null; }

    }

#if !(UNITY_WSA || UNITY_WP_8_1) || UNITY_EDITOR

    //This function encodes inBuffer to lzma alone format into the outBuffer provided.
    //The buffer can be saved also into a file and can be opened by applications that opens the lzma alone format.
    //This buffer can be uncompressed by the decompressBuffer function.
    //Returns true if success
    //if makeHeader==false then the lzma 13 bytes header will not be added to the buffer.
    //
    //You can set the compression properties by calling the setProps function before.
    //setProps(9) for example will set compression level to the highest level.
    //
    public static bool compressBuffer(byte[] inBuffer, ref byte[] outBuffer, bool makeHeader = true)
    {

        if (!defaultsSet) setProps();
        GCHandle prps = GCHandle.Alloc(props, GCHandleType.Pinned);

        GCHandle cbuf = GCHandle.Alloc(inBuffer, GCHandleType.Pinned);
        IntPtr ptr;

        int res = 0;

        ptr = Lzma_Compress(cbuf.AddrOfPinnedObject(), inBuffer.Length, makeHeader, ref res, prps.AddrOfPinnedObject());

        cbuf.Free(); prps.Free();

        if (res == 0 || ptr == IntPtr.Zero) { _releaseBuffer(ptr); return false; }

        Array.Resize(ref outBuffer, res);
        Marshal.Copy(ptr, outBuffer, 0, res);

        _releaseBuffer(ptr);

        return true;
    }


    //same as the above function, only it compresses a part of the input buffer.
    //
    //inBufferPartialLength: the size of the input buffer that should be compressed
    //inBufferPartialIndex:  the offset of the input buffer from where the compression will start
    //
    public static bool compressBufferPartial(byte[] inBuffer, int inBufferPartialIndex, int inBufferPartialLength, ref byte[] outBuffer, bool makeHeader = true)
    {
        if (inBufferPartialIndex + inBufferPartialLength > inBuffer.Length) return false;

        if (!defaultsSet) setProps();
        GCHandle prps = GCHandle.Alloc(props, GCHandleType.Pinned);
        GCHandle cbuf = GCHandle.Alloc(inBuffer, GCHandleType.Pinned);

        IntPtr ptr;
        IntPtr ptrPartial;

        int res = 0;

        ptrPartial = new IntPtr(cbuf.AddrOfPinnedObject().ToInt64() + inBufferPartialIndex);

        ptr = Lzma_Compress(ptrPartial, inBufferPartialLength, makeHeader, ref res, prps.AddrOfPinnedObject());

        cbuf.Free();

        if (res == 0 || ptr == IntPtr.Zero) { _releaseBuffer(ptr); return false; }

        Array.Resize(ref outBuffer, res);
        Marshal.Copy(ptr, outBuffer, 0, res);

        _releaseBuffer(ptr);

        return true;
    }


    //same as compressBufferPartial, only this function will compress the data into a fixed size buffer
    //the compressed size is returned so you can manipulate it at will.
    public static int compressBufferPartialFixed(byte[] inBuffer, int inBufferPartialIndex, int inBufferPartialLength, ref byte[] outBuffer, bool safe = true, bool makeHeader = true)
    {
        if (inBufferPartialIndex + inBufferPartialLength > inBuffer.Length) return 0;

        if (!defaultsSet) setProps();
        GCHandle prps = GCHandle.Alloc(props, GCHandleType.Pinned);
        GCHandle cbuf = GCHandle.Alloc(inBuffer, GCHandleType.Pinned);

        IntPtr ptr;
        IntPtr ptrPartial;

        int res = 0;

        ptrPartial = new IntPtr(cbuf.AddrOfPinnedObject().ToInt64() + inBufferPartialIndex);

        ptr = Lzma_Compress(ptrPartial, inBufferPartialLength, makeHeader, ref res, prps.AddrOfPinnedObject());

        cbuf.Free();

        if (res == 0 || ptr == IntPtr.Zero) { _releaseBuffer(ptr); return 0; }

        //if the compressed buffer is larger then the fixed size buffer we use:
        //1. then write only the data that fit in it.
        //2. or we return 0. 
        //It depends on if we set the safe flag to true or not.
        if (res > outBuffer.Length)
        {
            if (safe) { _releaseBuffer(ptr); return 0; } else { res = outBuffer.Length; }
        }

        Marshal.Copy(ptr, outBuffer, 0, res);

        _releaseBuffer(ptr);

        return res;
    }


    //same as the compressBuffer function, only this function will put the result in a fixed size buffer to avoid memory allocations.
    //the compressed size is returned so you can manipulate it at will.
    public static int compressBufferFixed(byte[] inBuffer, ref byte[] outBuffer, bool safe = true, bool makeHeader = true)
    {

        if (!defaultsSet) setProps();
        GCHandle prps = GCHandle.Alloc(props, GCHandleType.Pinned);

        GCHandle cbuf = GCHandle.Alloc(inBuffer, GCHandleType.Pinned);
        IntPtr ptr;

        int res = 0;

        ptr = Lzma_Compress(cbuf.AddrOfPinnedObject(), inBuffer.Length, makeHeader, ref res, prps.AddrOfPinnedObject());

        cbuf.Free(); prps.Free();
        if (res == 0 || ptr == IntPtr.Zero) { _releaseBuffer(ptr); return 0; }

        //if the compressed buffer is larger then the fixed size buffer we use:
        //1. then write only the data that fit in it.
        //2. or we return 0. 
        //It depends on if we set the safe flag to true or not.
        if (res > outBuffer.Length)
        {
            if (safe) { _releaseBuffer(ptr); return 0; } else { res = outBuffer.Length; }
        }

        Marshal.Copy(ptr, outBuffer, 0, res);

        _releaseBuffer(ptr);

        return res;
    }

#endif





    //This function will decompress a compressed asset bundle.
    //It finds the magic number of the lzma format and extracts from there.
    //
    //inBuffer:		the buffer that stores a compressed asset bundle.
    //outBuffer:	a referenced buffer where the asset bundle will be uncompressed.
    //The error codes
    /*
        OK 0
		
        ERROR_DATA 1
        ERROR_MEM 2
        ERROR_UNSUPPORTED 4
        ERROR_PARAM 5
        ERROR_INPUT_EOF 6
        ERROR_OUTPUT_EOF 7
        ERROR_FAIL 11
        ERROR_THREAD 12
    */
    public static int decompressAssetBundle(byte[] inBuffer, ref byte[] outbuffer)
    {

        int offset = 0;

        for (int i = 0; i < inBuffer.Length; i++)
        {
            if (i > 1024) break;
            if (inBuffer[i] == 0x5d)
            {
                if (inBuffer[i + 1] == 0x00)
                {
                    if (inBuffer[i + 2] == 0x00)
                    {
                        if (inBuffer[i + 3] == 0x08)
                        {
                            offset = i; break;
                        }
                    }
                }
            }
        }

        if (offset == 0 || offset > 1024) return 4;

        GCHandle cbuf = GCHandle.Alloc(inBuffer, GCHandleType.Pinned);
        IntPtr ptrBundle = new IntPtr(cbuf.AddrOfPinnedObject().ToInt64() + offset);
        int uncompressedSize = (int)BitConverter.ToUInt64(inBuffer, offset + 5);
        if (uncompressedSize < 0) { cbuf.Free(); return 4; }
        Array.Resize(ref outbuffer, uncompressedSize);
        GCHandle obuf = GCHandle.Alloc(outbuffer, GCHandleType.Pinned);

        int res = Lzma_Uncompress(ptrBundle, inBuffer.Length - offset, uncompressedSize, obuf.AddrOfPinnedObject(), true);

        cbuf.Free();
        obuf.Free();

        //if(res!=0){/*Debug.Log("ERROR: "+res.ToString());*/ return res; }

        return res;
    }


    /*
	//this will decompress an lzma alone format file.
	public static  int decompressLzmaAlone(string inFile,  string outFile){

		if(File.Exists(inFile)) {
			var inBuffer = File.ReadAllBytes(inFile);

			int offset = 0;
		
			for(int i=0; i<inBuffer.Length; i++) {
				if(i>16) break;
				if(inBuffer[i] == 0x5d) {
					if(inBuffer[i+1] == 0x00) {
						if(inBuffer[i+2] == 0x00) {
							if(inBuffer[i+3] == 0x00) {
								offset = i;  break; 
							}
						}
					}
				}
			}
		
			if(offset>16) {  inBuffer=null; return 4; }

			GCHandle cbuf = GCHandle.Alloc(inBuffer, GCHandleType.Pinned);
			IntPtr ptrBundle = new IntPtr(cbuf.AddrOfPinnedObject().ToInt64() + offset);
			int uncompressedSize = (int)BitConverter.ToUInt64(inBuffer,offset+5);
			if(uncompressedSize<0) { cbuf.Free(); return 4; }
			byte[] outBuffer = new byte[uncompressedSize];
			GCHandle obuf = GCHandle.Alloc(outBuffer, GCHandleType.Pinned);
		
			int res = Lzma_Uncompress(ptrBundle, inBuffer.Length-offset, uncompressedSize, obuf.AddrOfPinnedObject(), true);

			cbuf.Free();
			obuf.Free();

			File.WriteAllBytes(outFile, outBuffer);

			Array.Resize(ref outBuffer, 0);
			Array.Resize(ref inBuffer, 0);

			outBuffer = null;
			inBuffer = null;

			GC.Collect();

			return res;	
		} else {
			return -1;
		}	
	}
	*/


    //This function decompresses an lzma compressed byte buffer.
    //If the useHeader flag is false you have to provide the uncompressed size of the buffer via the customLength integer.
    //if res==0 operation was successful
    //The error codes
    /*
        OK 0
		
        ERROR_DATA 1
        ERROR_MEM 2
        ERROR_UNSUPPORTED 4
        ERROR_PARAM 5
        ERROR_INPUT_EOF 6
        ERROR_OUTPUT_EOF 7
        ERROR_FAIL 11
        ERROR_THREAD 12
        */
    public static int decompressBuffer(byte[] inBuffer, ref byte[] outbuffer, bool useHeader = true, int customLength = 0)
    {

        GCHandle cbuf = GCHandle.Alloc(inBuffer, GCHandleType.Pinned);
        int uncompressedSize = 0;

        //if the lzma header will be used to extract the uncompressed size of the buffer. If the buffer does not have a header 
        //provide the known uncompressed size through the customLength integer.
        if (useHeader) uncompressedSize = (int)BitConverter.ToUInt64(inBuffer, 5); else uncompressedSize = customLength;

        Array.Resize(ref outbuffer, uncompressedSize);

        GCHandle obuf = GCHandle.Alloc(outbuffer, GCHandleType.Pinned);

        int res = Lzma_Uncompress(cbuf.AddrOfPinnedObject(), inBuffer.Length, uncompressedSize, obuf.AddrOfPinnedObject(), useHeader);

        cbuf.Free();
        obuf.Free();

        //if(res!=0){/*Debug.Log("ERROR: "+res.ToString());*/ return res; }

        return res;
    }

    public static byte[] decompressBuffer(byte[] inBuffer, bool useHeader = true, int customLength = 0)
    {

        GCHandle cbuf = GCHandle.Alloc(inBuffer, GCHandleType.Pinned);
        int uncompressedSize = 0;

        //if the lzma header will be used to extract the uncompressed size of the buffer. If the buffer does not have a header 
        //provide the known uncompressed size through the customLength integer.
        if (useHeader) uncompressedSize = (int)BitConverter.ToUInt64(inBuffer, 5); else uncompressedSize = customLength;

        byte[] outbuffer = new byte[uncompressedSize];

        GCHandle obuf = GCHandle.Alloc(outbuffer, GCHandleType.Pinned);

        int res = Lzma_Uncompress(cbuf.AddrOfPinnedObject(), inBuffer.Length, uncompressedSize, obuf.AddrOfPinnedObject(), useHeader);

        cbuf.Free();
        obuf.Free();

        if (res != 0) {/*Debug.Log("ERROR: "+res.ToString());*/ return null; }

        return outbuffer;
    }


    //same as above function. Only this one outputs to a buffer of fixed which size isn't resized to avoid memory allocations.
    //The fixed buffer should have a size that will be able to hold the incoming decompressed data.
    //returns the uncompressed size.
    public static int decompressBufferFixed(byte[] inBuffer, ref byte[] outbuffer, bool safe = true, bool useHeader = true, int customLength = 0)
    {

        int uncompressedSize = 0;

        //if the lzma header will be used to extract the uncompressed size of the buffer. If the buffer does not have a header 
        //provide the known uncompressed size through the customLength integer.
        if (useHeader) uncompressedSize = (int)BitConverter.ToUInt64(inBuffer, 5); else uncompressedSize = customLength;

        //Check if the uncompressed size is bigger then the size of the fixed buffer. Then:
        //1. write only the data that fit in it.
        //2. or return a negative number. 
        //It depends on if we set the safe flag to true or not.
        if (uncompressedSize > outbuffer.Length)
        {
            if (safe) return -101; else uncompressedSize = outbuffer.Length;
        }

        GCHandle cbuf = GCHandle.Alloc(inBuffer, GCHandleType.Pinned);
        GCHandle obuf = GCHandle.Alloc(outbuffer, GCHandleType.Pinned);

        int res = Lzma_Uncompress(cbuf.AddrOfPinnedObject(), inBuffer.Length, uncompressedSize, obuf.AddrOfPinnedObject(), useHeader);

        cbuf.Free();
        obuf.Free();

        if (res != 0) {/*Debug.Log("ERROR: "+res.ToString());*/ return -res; }

        return uncompressedSize;
    }

}
#endif