public List <SharpChainBlock> ReadBlocks(bool checkConsistency = true, bool CopyEx = false, int start = 0, int length = 0, bool SanityCheck = false) // Read Blocks in the Blockchain { string filename = this.Database; List <SharpChainBlock> blocks = new List <SharpChainBlock>(); if (!File.Exists(this.Database)) { return(blocks); } string consist_prev_hash = "0000000000000000000000000000000000000000000000000000000000000000"; // Genesis hash, 64 0's var newFile = filename; if (CopyEx) { newFile = filename + "-copy-" + Guid.NewGuid().ToString(); File.Copy(filename, newFile); } using (FileStream fs = File.Open(newFile, FileMode.Open)) { if (fs != null) { byte[] testarr = new byte[(int)fs.Length]; int posOffset = 0; UInt32 _magic; int count = 0; int _dataLen = 0; int _time = 0; int _olength = 0; string _dataS = ""; string _owner = ""; string _PrevHash = ""; string _BlockHash = ""; byte[] hash_gen = new byte[99999]; fs.Read(testarr, 0, (int)fs.Length); var len = testarr.Length; var max = start > 0 ? length + start : len; for (int i = 0; i < testarr.Length; i++) { if (i >= start && i <= max) { hash_gen[i] = testarr[i]; int testtt = (i + _dataLen) - posOffset; if (i - posOffset == 0) // MAGIC { _magic = BitConverter.ToUInt32(testarr, i); } else if (i - posOffset == 1 && i != 1) { _magic = BitConverter.ToUInt32(testarr, i); } else if (i - posOffset == 5) { _time = BitConverter.ToInt32(testarr, i); } else if (i - posOffset == 9) // Data Length { _dataLen = BitConverter.ToInt32(testarr, i); } else if (i - posOffset >= 13 && i - posOffset < (13 + _dataLen)) { _dataS += System.Text.Encoding.UTF8.GetString(new[] { testarr[i] }); } else if (i - posOffset > (13 + _dataLen) - 1 && i - posOffset < ((13 + _dataLen) + 64)) // Previous Hash { _PrevHash += System.Text.Encoding.UTF8.GetString(new[] { testarr[i] }); } else if (i - posOffset > ((13 + _dataLen) + 64) - 1 && i - posOffset < (((13 + _dataLen) + 64) + 64)) //Block Hash { _BlockHash += System.Text.Encoding.UTF8.GetString(new[] { testarr[i] }); } else if (i - posOffset > (((13 + _dataLen) + 64) + 64) - 1 && i - posOffset < (((13 + _dataLen) + 64) + 64) + 1) //Block Hash { _olength = testarr[i]; } else if (i - posOffset > (((13 + _dataLen) + 64) + 64) + 3 && i - posOffset < (((13 + _dataLen) + 64) + 64) + 3 + _olength + 1) { _owner += System.Text.Encoding.UTF8.GetString(new[] { testarr[i] }); } else if (i - posOffset > (((13 + _dataLen) + 64) + 64) + 3 + _olength + 1 || i >= fs.Length - 1) { count++; posOffset = i; // Check validation // Compute SharpChain Hash string currentHash = SharpChainHash.ComputeHash(_time, _PrevHash, _dataS, _owner, SHA256_Master); bool Inconsistent = false; if (currentHash != _BlockHash && i != 0 && checkConsistency) { Console.WriteLine("Found inconsistency with data!..."); Console.WriteLine("Found " + currentHash + " but expected " + _BlockHash); Console.WriteLine("*********************"); Console.WriteLine("INCONSISTENT @ BLOCK " + Convert.ToString(count - 1)); Console.WriteLine("DATA '" + _dataS + "' is unreliable!"); Console.WriteLine("*********************"); Console.WriteLine("Chain has been broken! "); Console.WriteLine(""); Console.WriteLine(""); Console.WriteLine(""); Inconsistent = true; if (SanityCheck) { return(null); } } if (consist_prev_hash != _PrevHash && i != 0 && checkConsistency) { Console.WriteLine("Found inconsistency with data!..."); Console.WriteLine("Found " + _PrevHash + " but expected " + consist_prev_hash); Console.WriteLine("*********************"); Console.WriteLine("INCONSISTENT @ BLOCK " + Convert.ToString(count - 1)); Console.WriteLine("DATA '" + _dataS + "' is unreliable!"); Console.WriteLine("*********************"); Console.WriteLine("Chain has been broken! "); Console.WriteLine(""); Console.WriteLine(""); Console.WriteLine(""); Inconsistent = true; consist_prev_hash = _PrevHash; if (SanityCheck) { return(null); } } else { consist_prev_hash = currentHash; } if (Inconsistent == false && checkConsistency) { Console.WriteLine("Found expected Hash " + consist_prev_hash); Console.WriteLine("*********************"); Console.WriteLine("CONSISTENT @ BLOCK " + Convert.ToString(count - 1)); Console.WriteLine("DATA '" + _dataS + "' is reliable!"); Console.WriteLine("*********************"); Console.WriteLine("Chain has not yet been broken! "); Console.WriteLine(""); Console.WriteLine(""); Console.WriteLine(""); } SharpChainBlock block = new SharpChainBlock(_time, currentHash, _PrevHash, _dataS, filename, _owner, Inconsistent, SharpChainIndex.IndexOf(this, currentHash, true)); block.Height = count - 1; blocks.Add(block); _dataLen = 0; _dataS = null; _PrevHash = null; _BlockHash = null; _owner = null; _olength = 0; if (i >= fs.Length - 1) { break; } } } else { posOffset = i; } } fs.Flush(); fs.Close(); } else { Console.WriteLine("Could not open SharpChain file!"); } } if (checkConsistency) { if (blocks.Count > 0) { if (blocks[blocks.Count - 1].Inconsistent == false) { Console.WriteLine("Found no inconsistencies!"); } } } if (CopyEx) { if (File.Exists(newFile)) { File.Delete(newFile); } } return(blocks); }
} // Is Database Inconsistent public string GenerateHash(string SHA256_Master) // Generate The Hash { return(SharpChainHash.ComputeHash(this.TimeStamp, this.Hash.PreviousValue, this.Hash.Value, this.Owner, SHA256_Master)); }