public PacketBufferScanner(byte[] buffer)
{
if (buffer.Length < PacketFormat.PacketHeaderLength + PacketFormat.PacketTrailerMinLength)
{
throw new PacketFormatException(buffer, buffer.Length, "Insufficient bytes to form a valid packet.");
}
int lastTabPosition = buffer.Length - 1 - PacketFormat.PacketTrailerMinLength;
HasChecksum = buffer[lastTabPosition] != PacketFormatDelimiters.Tab;
if (HasChecksum)
{
const int packetLength = PacketFormat.PacketHeaderLength + PacketFormat.OptionalChecksumLength + PacketFormat.PacketTrailerMinLength;
if (buffer.Length < packetLength)
{
throw new PacketFormatException(buffer, lastTabPosition, "Insufficient bytes to form a valid packet with checksum.");
}
VerifyChecksum(buffer);
}
HeaderContext = new PacketParseContext(buffer, 0, PacketFormat.PacketHeaderLength);
int trailerLength = HasChecksum
? PacketFormat.PacketTrailerMinLength + PacketFormat.OptionalChecksumLength
: PacketFormat.PacketTrailerMinLength;
int trailerStartPosition = HasChecksum
? buffer.Length - PacketFormat.PacketTrailerMinLength - PacketFormat.OptionalChecksumLength
: buffer.Length - PacketFormat.PacketTrailerMinLength;
TrailerContext = new PacketParseContext(buffer, trailerStartPosition, trailerLength);
int payloadSize = buffer.Length - PacketFormat.PacketHeaderLength - trailerLength;
PayloadContext = new PacketParseContext(buffer, PacketFormat.PacketHeaderLength, payloadSize);
}
public PacketBufferScanner([NotNull] byte[] buffer)
{
if (buffer.Length < PacketFormat.PacketHeaderLength + PacketFormat.PacketTrailerMinLength)
{
throw new PacketFormatException(buffer, buffer.Length, "Insufficient bytes to form a valid packet.");
}
int lastTabPosition = buffer.Length - 1 - PacketFormat.PacketTrailerMinLength;
HasChecksum = buffer[lastTabPosition] != PacketFormatDelimiters.Tab;
if (HasChecksum)
{
const int packetLength =
PacketFormat.PacketHeaderLength + PacketFormat.OptionalChecksumLength +
PacketFormat.PacketTrailerMinLength;
if (buffer.Length < packetLength)
{
throw new PacketFormatException(buffer, lastTabPosition,
"Insufficient bytes to form a valid packet with checksum.");
}
VerifyChecksum(buffer);
}
HeaderContext = new PacketParseContext(buffer, 0, PacketFormat.PacketHeaderLength);
int trailerLength = HasChecksum
? PacketFormat.PacketTrailerMinLength + PacketFormat.OptionalChecksumLength
: PacketFormat.PacketTrailerMinLength;
int trailerStartPosition = HasChecksum
? buffer.Length - PacketFormat.PacketTrailerMinLength - PacketFormat.OptionalChecksumLength
: buffer.Length - PacketFormat.PacketTrailerMinLength;
TrailerContext = new PacketParseContext(buffer, trailerStartPosition, trailerLength);
int payloadSize = buffer.Length - PacketFormat.PacketHeaderLength - trailerLength;
PayloadContext = new PacketParseContext(buffer, PacketFormat.PacketHeaderLength, payloadSize);
}
