README
¶
SPARTN Format Parsing Library for Go
Format specification: https://www.spartnformat.org/
TODO: Add Message definitions and deserialization methods (currently only frames)
TODO: Find some SPARTN data to test with - I have no idea if the CRC methods are correct
Documentation
¶
Index ¶
- Constants
- Variables
- func DeserializeFrameStart(r *bufio.Reader, frame *Frame) (frameHeader []byte, err error)
- func DeserializeMessageCRC(t MessageCRCType, r *bufio.Reader) (c uint32, err error)
- func DeserializePayloadDescriptionBlock(r *bufio.Reader, frame *Frame) (parsedBytes []byte, err error)
- type Frame
- type MessageCRCType
Constants ¶
View Source
const (
FramePreamble uint8 = 0x73
)
Variables ¶
View Source
var (
FrameHash *crc.Hash = crc.NewHash(&crc.Parameters{
Width: 8,
Polynomial: 0x09,
})
)
Functions ¶
func DeserializeFrameStart ¶
DeserializeFrameStart discards bytes from Reader only if CRC is valid.
func DeserializeMessageCRC ¶
func DeserializeMessageCRC(t MessageCRCType, r *bufio.Reader) (c uint32, err error)
Types ¶
type Frame ¶
type Frame struct {
Preamble uint8 // 8
MessageType uint8 // 7
PayloadLength uint16 // 10
EAF bool // 1
MessageCRCType MessageCRCType // 2
CRC uint8 // 4
MessageSubtype uint8 // 4
TimeTagType bool // 1
TimeTag uint32 // TimeTagType ? 16bits : 32bits
SolutionID uint8 // 7
SolutionProcessorID uint8 // 4
EncryptionID uint8 // 4
EncryptionSequenceNumber uint8 // 6
AuthenticationIndicator uint8 // 3
EmbeddedAuthenticationLength uint8 // 3
MessagePayload []byte // SizeOf MessageLength - padded
EmbeddedAuthenticationData []byte // SizeOf EmbeddedAuthenticationLength
MessageCRC uint32 // 8 - 32
}
Frame is used to encapsulate encoded SPARTN Messages, supplying encryption and authentication information.
type MessageCRCType ¶
type MessageCRCType uint8
const ( // TODD: Consider making these types so we only need one case statement (in Deserialization) CRC8CCITT MessageCRCType = 0 CRC16CCITT MessageCRCType = 1 CRC24Radix64 MessageCRCType = 2 CRC32CCITT MessageCRCType = 3 )
func (MessageCRCType) CalculateCRC ¶
func (t MessageCRCType) CalculateCRC(data []byte) (c uint32, err error)
Source Files
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