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disktelemetry.go
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disktelemetry.go
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package irsdk
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"unsafe"
"github.com/leonb/irsdk-go/utils"
)
type TelemetryReader struct {
data io.ReadSeeker
header *utils.Header
subHeader *utils.DiskSubHeader
sessionData *SessionData
varHeaders []*utils.VarHeader
dataPoints []*TelemetryData
}
// Read is a temporary function
func (tr *TelemetryReader) Read() error {
// header, err := tr.GetHeader()
// if err != nil {
// return err
// }
// fmt.Printf("%+v\n", header)
// subHeader, err := tr.GetsubHeader()
// if err != nil {
// return err
// }
// fmt.Printf("%+v\n", subHeader)
// sessionData, err := tr.GetSessionData()
// if err != nil {
// return err
// }
// fmt.Printf("%+v\n", sessionData)
// varHeader, err := tr.GetVarHeader()
// if err != nil {
// return err
// }
datapoints, err := tr.GetAllDataPoints()
if err != nil {
return err
}
for _, dp := range datapoints {
fmt.Println(dp.OnPitRoad)
}
last := len(datapoints) - 1
fmt.Printf("%+v\n", datapoints[last])
return nil
}
// GetHeader memoizes the ReadHeader function
func (tr *TelemetryReader) GetHeader() (*utils.Header, error) {
var err error
if tr.header == nil {
tr.header, err = tr.ReadHeader()
return tr.header, err
}
return tr.header, err
}
// ReadHeader tries to read the main header from the file
func (tr *TelemetryReader) ReadHeader() (*utils.Header, error) {
header := &utils.Header{}
// Create byte slice big enough for header data
size := binary.Size(header)
b := make([]byte, size)
// Jump to right position in file
startByte := 0
tr.data.Seek(int64(startByte), 0) // 0 = relative to the origin of the file
// Read data from file into byteslice
_, err := tr.data.Read(b)
if err != nil {
return nil, err
}
// Create a pointer to the bytes
bPtr := uintptr(unsafe.Pointer(&b[0]))
// Point header struct to the location of the bytes
header = (*utils.Header)(unsafe.Pointer(bPtr))
return header, nil
}
// GetHeader memoizes the ReadSubHeader function
func (tr *TelemetryReader) GetsubHeader() (*utils.DiskSubHeader, error) {
var err error
if tr.subHeader == nil {
tr.subHeader, err = tr.ReadSubHeader()
return tr.subHeader, err
}
return tr.subHeader, err
}
// ReadSubHeader reads the second header specialiy for telemtry data saved to
// .ibt files
func (tr *TelemetryReader) ReadSubHeader() (*utils.DiskSubHeader, error) {
header, err := tr.GetHeader()
if err != nil {
return nil, err
}
subHeader := &utils.DiskSubHeader{}
headerSize := binary.Size(header)
subHeaderSize := binary.Size(subHeader)
startByte := headerSize
// Create byte slice big enough for subHeader data
b := make([]byte, subHeaderSize)
// Jump to right position in file
tr.data.Seek(int64(startByte), 0) // 0 = relative to the origin of the file
// Read data from file into byteslice
_, err = tr.data.Read(b)
if err != nil {
return nil, err
}
// Create a pointer to the bytes
bPtr := uintptr(unsafe.Pointer(&b[0]))
// Point subHeader struct to the location of the bytes
subHeader = (*utils.DiskSubHeader)(unsafe.Pointer(bPtr))
return subHeader, nil
}
// GetSessionData memoizes the ReadSubHeader function
func (tr *TelemetryReader) GetSessionData() (*SessionData, error) {
var err error
if tr.sessionData == nil {
tr.sessionData, err = tr.ReadSessionData()
return tr.sessionData, err
}
return tr.sessionData, err
}
func (tr *TelemetryReader) ReadSessionData() (*SessionData, error) {
header, err := tr.GetHeader()
if err != nil {
return nil, err
}
// Copied from GetSessionInfoStr()
startByte := header.SessionInfoOffset
sessionSize := header.SessionInfoLen
// Create byte slice big enough for subHeader data
b := make([]byte, sessionSize)
// Jump to right position in file
tr.data.Seek(int64(startByte), 0) // 0 = relative to the origin of the file
// Read data from file into byteslice
_, err = tr.data.Read(b)
if err != nil {
return nil, err
}
if b == nil {
return nil, nil
}
// Copied from GetRawSessionData()
sep := []byte("\n...")
pieces := bytes.Split(b, sep)
if len(pieces) == 0 {
return nil, ErrEmptySessionData
}
if pieces[0] == nil {
return nil, ErrEmptySessionData
}
b = bytesToUtf8(pieces[0])
fmt.Printf("%v\n", b)
return NewSessionDataFromBytes(b)
}
// GetVarHeaders memoizes the ReadHeader function
func (tr *TelemetryReader) GetVarHeaders() ([]*utils.VarHeader, error) {
var err error
if tr.varHeaders == nil {
tr.varHeaders, err = tr.ReadVarHeaders()
return tr.varHeaders, err
}
return tr.varHeaders, err
}
// ReadVarHeaders reads the second header specialiy for telemtry data saved to
// .ibt files
func (tr *TelemetryReader) ReadVarHeaders() ([]*utils.VarHeader, error) {
header, err := tr.GetHeader()
if err != nil {
return nil, err
}
varHeader := &utils.VarHeader{}
startByte := int64(header.VarHeaderOffset)
varHeaderSize := binary.Size(varHeader)
numVars := int(header.NumVars)
varHeaders := make([]*utils.VarHeader, numVars)
// Jump to right position in file
tr.data.Seek(startByte, 0) // 0 = relative to the origin of the file
for i := 0; i < numVars; i++ {
// Create byte slice big enough for varHeader data
b := make([]byte, varHeaderSize)
// Read data from file into byteslice
_, err = tr.data.Read(b)
if err != nil {
return nil, err
}
// Create a pointer to the bytes
bPtr := uintptr(unsafe.Pointer(&b[0]))
// Point varHeader struct to the location of the bytes
vh := (*utils.VarHeader)(unsafe.Pointer(bPtr))
varHeaders[i] = vh
}
return varHeaders, nil
}
// GetVarBufs memoizes the ReadHeader function
func (tr *TelemetryReader) GetAllDataPoints() ([]*TelemetryData, error) {
var err error
if tr.dataPoints == nil {
tr.dataPoints, err = tr.ReadAllDataPoints()
return tr.dataPoints, err
}
return tr.dataPoints, err
}
// ReadAllDataPoints reads all datapoints (TelemetrydDat) from the file / memmap
func (tr *TelemetryReader) ReadAllDataPoints() ([]*TelemetryData, error) {
// diskSubHeader.sessionRecordCount should have the total number of
// telemetrydatapoints
//
// David Tucker wrote: Hmm, maybe this has a clue, it looks like there is an
// additional sessionRecordCount parameter tacked onto the YAML session
// string when writing out the .ibt file. My code seems to blow away the sub
// header sessionRecordCount and always uses the YAML version...
sessionRecordCount := 0
datapoints := make([]*TelemetryData, sessionRecordCount)
i := 0
for {
td, err := tr.ReadDataPointN(i)
if err != nil {
return nil, err
}
if td == nil {
// End of data: get out of while-loop
break
}
datapoints = append(datapoints, td)
i = i + 1
}
return datapoints, nil
}
// ReadDataPointN reads a specific datapoint (TelemetryData)
func (tr *TelemetryReader) ReadDataPointN(i int) (*TelemetryData, error) {
header, err := tr.GetHeader()
if err != nil {
return nil, err
}
latest := header.GetLatestVarBufN()
startByte := int(header.VarBuf[latest].BufOffset)
varBufSize := int(header.BufLen)
// Create byte slice big enough for telemetrydata
b := make([]byte, varBufSize)
// Get offset to jump to
offset := i * varBufSize
// Jump to right position in file
tr.data.Seek(int64(startByte+offset), 0) // 0 = relative to the origin of the file
// // Read data from file into byteslice
n, err := tr.data.Read(b)
if err != nil && err != io.EOF {
return nil, err
}
if n <= 0 {
return nil, nil
}
// Create new datapoint
td := NewTelemetryData()
// Loop through all headers and parse data/bytes
varHeaders, _ := tr.GetVarHeaders()
for _, varHeader := range varHeaders {
err = td.addVarHeaderData(varHeader, b)
if err != nil {
return nil, err
}
}
return td, nil
}
// NewTelemetryReader intializes a new TelemetryReader object based on an
// io.ReadSeeker
func NewTelemetryReader(data io.ReadSeeker) *TelemetryReader {
return &TelemetryReader{
data: data,
}
}