Пример #1
0
        public static MemoryStream ReadToMemoryStreamSafe(this Stream stream, long size, bool littleEndian)
        {
            MemoryStream memory = new MemoryStream();

            var myHash  = FNV.InitialHash64;
            var myHash2 = FNV.InitialHash32;

            long left = size;

            byte[] buffer = new byte[4096];
            while (left > 0)
            {
                int block = (int)(Math.Min(left, 4096));
                stream.Read(buffer, 0, block);
                myHash  = FNV.Hash64(buffer, 0, block);
                myHash2 = FNV.Hash32(buffer, 0, block);
                memory.Write(buffer, 0, block);
                left -= block;
            }

            var theirHash = stream.ReadValueU32(littleEndian);

            if (theirHash != myHash2)
            {
                // As it sometimes does not match, outcommented it at the moment

                /*throw new InvalidDataException(string.Format("hash failure ({0:X} vs {1:X})",
                 *  myHash, theirHash));*/
            }

            memory.Position = 0;
            return(memory);
        }
Пример #2
0
        public static void WriteFromMemoryStreamSafe(this Stream stream, MemoryStream data, bool littleEndian)
        {
            var position = data.Position;

            data.Position = 0;

            uint myHash = FNV.InitialHash32;

            long left = data.Length;

            byte[] buffer = new byte[4096];
            while (left > 0)
            {
                int block = (int)(Math.Min(left, 4096));
                data.Read(buffer, 0, block);
                myHash = FNV.Hash32(buffer, 0, block);
                stream.Write(buffer, 0, block);
                left -= block;
            }

            stream.WriteValueU32(myHash, littleEndian);
            data.Position = position;
        }