Implements a 32-bit CRC hash algorithm compatible with Zip etc.
Crc32 should only be used for backward compatibility with older file formats and algorithms. It is not secure enough for new applications. If you need to call multiple times for the same data either use the HashAlgorithm interface or remember that the result of one Compute call needs to be ~ (XOR) before being passed in as the seed for the next Compute call.
Inheritance: System.Security.Cryptography.HashAlgorithm
Example #1
0
        public Boolean check(Boolean action)
        {

            List<string> filessimilartemp = new List<string>();
            this.dirssimilar = new List<string>();
            this.dirsdelete = new List<string>();
            this.dirscreate = new List<string>();
            this.filescreate = new List<string>();
            this.filesdelete = new List<string>();
            this.filesmodify = new List<string>();
            this.filessimilar = new List<string>();

            Console.WriteLine("#################### CHECK DIR SIMILAR ###########################");
            foreach(var item in  this.ldirs.Intersect((IEnumerable<string>)this.lserverdirs))
            {
                this.dirssimilar.Add(item);
            }
            Console.WriteLine("#################### CHECK DIR TO CREATE ###########################");
            foreach (var item in this.lserverdirs.Except(this.dirssimilar))
            {
                this.dirscreate.Add(item);
            }
            Console.WriteLine("#################### CHECK DIR TO REMOVE ###########################");
            foreach (var item in this.ldirs.Except(this.dirssimilar))
            {
                this.dirsdelete.Add(item);
            }
            Console.WriteLine("#################### CHECK File SIMILAR ###########################");
            foreach (var item in this.lfiles.Intersect((IEnumerable<string>)this.lserverfiles))
            {
                this.filessimilar.Add(item);
            }
            Console.WriteLine("#################### CHECK DIR TO CREATE ###########################");
            foreach (var item in this.lserverfiles.Except(this.filessimilar))
            {
                this.filescreate.Add(item);
            }
            Console.WriteLine("#################### CHECK DIR TO REMOVE ###########################");
            foreach (var item in this.lfiles.Except(this.filessimilar))
            {
                this.filesdelete.Add(item);
            }
            Console.WriteLine("#################### CHECK Files TO Modify ###########################");
            foreach (var item in filessimilar)
            {
                int index = this.lserverfiles.IndexOf(item);
                String CRC = String.Empty;
                CRC = this.lserverfilesCrc.ElementAt(index);

                Crc32 crc32 = new Crc32();
                String hash = String.Empty;

                using (FileStream fs = File.Open(this.repoModsDir+item, FileMode.Open))
                {
                    foreach (byte b in crc32.ComputeHash(fs)) hash += b.ToString("x2").ToLower();
                }
                
                hash = hash.ToUpper();
                CRC = CRC.PadLeft(8, '0');

                if (hash == CRC)
                {
                    //Ok
                }
                else
                {
                    Console.WriteLine("ERREUR CRC : " + hash + " : " + CRC);
                    this.filesmodify.Add(item);
                    filessimilartemp.Add(item);
                }
            }

            foreach (var item in filessimilartemp)
            {
                this.filessimilar.Remove(item);
            }

            if (action)
            {
                Console.WriteLine("#################### Action #######################################");
                foreach (var item in this.dirscreate)
                {
                    Directory.CreateDirectory(this.repoModsDir + item);
                }
                foreach (var item in this.filesdelete)
                {
                    Console.WriteLine("# FILE : DELETE : " + item);
                    File.Delete(this.repoModsDir + item);
                }
                this.dirsdelete.Sort();
                this.dirsdelete.Reverse();
                foreach (var item in dirsdelete)
                {
                    Console.WriteLine("# DIR : DELETE : " + item);
                    Directory.Delete(this.repoModsDir + item);
                }

                foreach (var item in this.filescreate)
                {
                    // Get the object used to communicate with the server.
                    WebClient request = new WebClient();
                    // This example assumes the FTP site uses anonymous logon.
                    request.Credentials = new NetworkCredential(this.ftpUser, this.ftpPassword);
                    byte[] newFileData = request.DownloadData(this.ftpUrl + this.basedir + "mods/"+item);
                    FileStream newfile = new FileStream(this.repoModsDir+item, System.IO.FileMode.Create, System.IO.FileAccess.Write);
                    newfile.Write(newFileData, 0, newFileData.Length);
                    newfile.Close();
                }

                foreach (var item in this.filesmodify)
                {
                    File.Delete(this.repoModsDir + item);
                    //Download
                    // Get the object used to communicate with the server.
                    using(WebClient request = new WebClient()){
                        // This example assumes the FTP site uses anonymous logon.
                        request.Credentials = new NetworkCredential(this.ftpUser, this.ftpPassword);
                        byte[] newFileData = request.DownloadData(this.ftpUrl + this.basedir + "mods/" + item);
                        FileStream newfile = new FileStream(this.repoModsDir + item, System.IO.FileMode.Create, System.IO.FileAccess.Write);
                        newfile.Write(newFileData, 0, newFileData.Length);
                        newfile.Close();
                    }
                }
                
            }

            if ((dirsdelete.Count + dirscreate.Count + filescreate.Count + filesdelete.Count + filesmodify.Count) > 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }
        private void WriteFile(string file)
        {
            var hash = new byte[0];
            var crcFile = $"{file}.crc";

            if (Path.GetExtension(file) == ".bak")
                crcFile = Path.ChangeExtension(file, ".crc.bak");

            using (var fs = File.OpenWrite(file))
            using (var writer = new BinaryWriter(fs))
            {
                writer.Write(1); // File Format
                if ((Int32) this._worldData["mnVersion"] != -1)
                    writer.Write((Int32) this._worldData["mnVersion"]);
                else writer.Write(4);
                writer.Write((string) this._worldData["mName"]);
                writer.Write((Int32) this._worldData["mnWorldSeed"]);
                writer.Write((Single) this._worldData["mrGravity"]);
                writer.Write((Single) this._worldData["mrMovementSpeed"]);
                writer.Write((Single) this._worldData["mrJumpSpeed"]);
                writer.Write((Single) this._worldData["mrMaxFallingSpeed"]);
                writer.Write((Int32) this._worldData["meGameMode"]);
                writer.Write((string) this._worldData["mInjectionSet"]);
                writer.Write((Int32) this._worldData["mnResourceLevel"]);
                writer.Write((Int32) this._worldData["mnPowerLevel"]);
                writer.Write((Int32) this._worldData["mnConveyorLevel"]);
                writer.Write((Int32) this._worldData["mnDayLevel"]);
                writer.Write((Int32) this._worldData["meDeathEffect"]);
                writer.Write((Int64) this._worldData["mSpawnX"]);
                writer.Write((Int64) this._worldData["mSpawnY"]);
                writer.Write((Int64) this._worldData["mSpawnZ"]);
                writer.Write((Boolean) this._worldData["mbIntroCompleted"]);
                writer.Write((Int32) this._worldData["mnMobLevel"]);
                writer.Write((Boolean) this._worldData["mbTutorialCompleted"]);
                writer.Write((Boolean) this._worldData["mbRushMode"]);
                writer.Write((Single) this._worldData["mrWorldTimePlayed"]);
                writer.Write((Int32) this._worldData["mnSharedResearchMode"]);
                writer.Write((Single) this._worldData["mrCurrentTimeOfDay"]);
                writer.Write((Int64) this._worldData["mCPHCoordX"]);
                writer.Write((Int64) this._worldData["mCPHCoordY"]);
                writer.Write((Int64) this._worldData["mCPHCoordZ"]);
                writer.Write((Boolean) this._worldData["mbFlatland"]);
                writer.Write((Boolean) this._worldData["mbCarePackage"]);
            }

            using (var fs = File.OpenRead(file))
            {
                var crc = new Crc32(3988292384u, 4294967295u);
                hash = crc.ComputeHash(fs);
            }

            using (var fs = File.Open(crcFile, FileMode.OpenOrCreate))
            using (var writer = new StreamWriter(fs))
            {
                for (var i = 0; i < hash.Length; i++)
                {
                    writer.Write(hash[i].ToString("X2").ToLower());
                }
            }
        }
        private void GetFileInformation(Uri uri, string fullPath, string[] currentContentStatus)
        {
            Crc32 crc32 = new Crc32();
            String hash = String.Empty;
            try
            {
                FileStream fs = File.Open(fullPath, FileMode.Open);
                foreach (byte b in crc32.ComputeHash(fs))
                {
                    hash += b.ToString("x2").ToLower();
                }
                fs.Close();

                bool newVersion = hash.Equals(currentContentStatus.Last());
                FileInfo savedFile = new FileInfo(fullPath);
                StreamWriter sw = new StreamWriter(fullPath + ".stat");
                sw.Write(uri + " " + savedFile.LastWriteTimeUtc.ToShortTimeString() + " " + newVersion + " " + hash);
                sw.Close();

            }
            catch (Exception exc)
            {
                this.logger.Error(exc.Message);
            }
        }
Example #4
0
        // Yrittää lukea tiedoston muistiin ja korvaa/lisää siihen Image-olioon tallennetut DPI-arvot
        public List<byte> readFile(Image image)
        {
            List<byte> binaryFile = new List<byte>();
            try
            {
                using (BinaryReader binReader = new BinaryReader(File.Open(image.Path, FileMode.Open)))
                {
                    long pos = 0;
                    long length = binReader.BaseStream.Length;
                    List<byte> byteBuffer = new List<byte>();
                    List<byte> pHYs = Encoding.ASCII.GetBytes("pHYs").ToList<byte>();
                    List<byte> IDAT = Encoding.ASCII.GetBytes("IDAT").ToList<byte>();
                    bool dpiReplaced = false;
                    while (pos < length)
                    {
                        byte B = binReader.ReadByte();
                        binaryFile.Add(B);

                        if (!dpiReplaced)
                        {
                            byteBuffer.Add(B);
                            while (byteBuffer.Count > 4) byteBuffer.RemoveAt(0);

                            if (byteBuffer.SequenceEqual(pHYs))
                            {
                                binReader.ReadBytes(9 + 4);
                                pos += sizeof(byte) * (9 + 4);

                                List<byte> data = new List<byte>();
                                data.AddRange(image.GetDpmByteList("x"));
                                data.AddRange(image.GetDpmByteList("y"));
                                data.Add(image.GetUnitAsByte());

                                binaryFile.AddRange(data);

                                Crc32 crc32 = new Crc32();
                                binaryFile.AddRange(crc32.ComputeHash(new MemoryStream(data.ToArray())));

                                dpiReplaced = true;
                            }
                            else if (byteBuffer.SequenceEqual(IDAT))
                            {
                                List<byte> data = new List<byte>();
                                data.AddRange(image.GetDpmByteList("x"));
                                data.AddRange(image.GetDpmByteList("y"));
                                data.Add(image.GetUnitAsByte());

                                List<byte> physChunk = new List<byte>();

                                byte[] size = BitConverter.GetBytes(9);
                                if (BitConverter.IsLittleEndian) Array.Reverse(size);

                                physChunk.AddRange(size);
                                physChunk.AddRange(pHYs);
                                physChunk.AddRange(data);

                                Crc32 crc32 = new Crc32();
                                physChunk.AddRange(crc32.ComputeHash(new MemoryStream(data.ToArray())));

                                binaryFile.InsertRange(binaryFile.Count - 8, physChunk);
                                dpiReplaced = true;
                            }
                        }

                        pos += sizeof(byte);
                    }
                }
            }
            catch { return null; }

            return binaryFile;
        }
Example #5
0
 // Token: 0x060008BC RID: 2236 RVA: 0x0000D331 File Offset: 0x0000B531
 public static uint Compute(uint seed, byte[] buffer)
 {
     return(Crc32.Compute(3988292384U, seed, buffer));
 }
Example #6
0
 // Token: 0x060008BD RID: 2237 RVA: 0x0000D33F File Offset: 0x0000B53F
 public static uint Compute(uint polynomial, uint seed, byte[] buffer)
 {
     return(~Crc32.CalculateHash(Crc32.InitializeTable(polynomial), seed, buffer, 0, buffer.Length));
 }
Example #7
0
 // Token: 0x060008BB RID: 2235 RVA: 0x0000D328 File Offset: 0x0000B528
 public static uint Compute(byte[] buffer)
 {
     return(Crc32.Compute(uint.MaxValue, buffer));
 }
Example #8
0
 // Token: 0x060008B9 RID: 2233 RVA: 0x0000D316 File Offset: 0x0000B516
 protected override byte[] HashFinal()
 {
     return(Crc32.UInt32ToBigEndianBytes(~this.hash));
 }
Example #9
0
 // Token: 0x060008B8 RID: 2232 RVA: 0x0000D2FA File Offset: 0x0000B4FA
 protected override void HashCore(byte[] array, int ibStart, int cbSize)
 {
     this.hash = Crc32.CalculateHash(this.table, this.hash, array, ibStart, cbSize);
 }
Example #10
0
 // Token: 0x060008B6 RID: 2230 RVA: 0x0004AD14 File Offset: 0x00048F14
 public Crc32(uint polynomial, uint seed)
 {
     this.table = Crc32.InitializeTable(polynomial);
     this.hash  = seed;
     this.seed  = seed;
 }
Example #11
0
File: Form1.cs Project: Abitech/m3o
        private string ComputeHash(string path)
        {
            Crc32 crc32 = new Crc32();
            String hash = String.Empty;

            using (FileStream fs = File.Open(path, FileMode.Open))
            {
                foreach (byte b in crc32.ComputeHash(fs))
                {
                    hash += b.ToString("x2").ToLower();
                }
            }

            return hash;
        }