private void WriteHeader()
{
int expectedSize = 0x1000 - 4;
/* set protobuf header size */
FileContent[0] = (byte)(expectedSize >> 24);
FileContent[1] = (byte)(expectedSize >> 16);
FileContent[2] = (byte)(expectedSize >> 8);
FileContent[3] = (byte)(expectedSize >> 0);
/* first use one byte padding */
Header.Padding = new byte[1];
var stream = new MemoryStream();
var coder = new ProtoCoder();
byte[] dataPre = coder.Serialize <FileHeader>(Header);
/* then determine how many extra bytes to fill */
long padding = expectedSize - dataPre.Length;
Header.Padding = new byte[padding];
byte[] data = coder.Serialize <FileHeader>(Header);
Array.Copy(data, 0, FileContent, 4, data.Length);
}
private void ParseBuffer()
{
int protoBufLength = (FileContent[0] << 24) | (FileContent[1] << 16) | (FileContent[2] << 8) | FileContent[3];
if (protoBufLength > 0x10000)
{
throw new InvalidDataException();
}
byte[] protoBuf = new byte[protoBufLength];
int payloadStart = protoBufLength + 4;
int payloadLength = FileContent.Length - payloadStart;
byte[] payload = new byte[payloadLength];
Array.Copy(FileContent, 4, protoBuf, 0, protoBufLength);
Array.Copy(FileContent, protoBufLength + 4, payload, 0, payloadLength);
var coder = new ProtoCoder();
FileHeader header = coder.Deserialize <FileHeader>(protoBuf);
var prov = new SHA1CryptoServiceProvider();
var hash = prov.ComputeHash(payload);
HashCorrect = true;
if (!hash.SequenceEqual(header.Hash))
{
HashCorrect = false;
}
byte[] data = coder.Serialize(header);
HeaderLength = data.Length;
Audio = payload;
Header = header;
}
