func (a *ADAM4000) GetConfig() error {
resp, err := a.comResF("$%02X2\r", a.address)
if err != nil {
return err
}
addr := make([]byte, 1)
typecode := make([]byte, 1)
baud := make([]byte, 1)
data := make([]byte, 1)
hex.Decode(addr, resp[1:3])
hex.Decode(typecode, resp[3:5])
hex.Decode(baud, resp[5:7])
hex.Decode(data, resp[7:9])
a.Address = addr[0]
a.InputRange = InputRangeCode(typecode[0])
a.BaudRate = BaudRateCode(baud[0])
fmt.Printf("%X\n", data)
a.Integration_time = data[0]&byte(1<<7) > 0
a.Checksum = data[0]&byte(1<<6) > 0
a.DataFormat = DataFormatCode(data[0] & byte(2))
if a.Address != a.address {
fmt.Printf("Warning: Configured address (%d) differs from connected address (%d), in init mode?\n", a.Address, a.address)
}
return nil
}
func (o *Commit) SetBytes(b []byte) (err error) {
o.Content = b
lines := bytes.Split(b, []byte{'\n'})
for i := range lines {
if len(lines[i]) > 0 {
split := bytes.SplitN(lines[i], []byte{' '}, 2)
switch string(split[0]) {
case "tree":
o.Tree = make([]byte, 20)
_, err = hex.Decode(o.Tree, split[1])
case "parent":
h := make([]byte, 20)
_, err = hex.Decode(h, split[1])
if err == nil {
o.Parents = append(o.Parents, h)
}
case "author":
o.Author = string(split[1])
case "committer":
o.Committer = string(split[1])
}
if err != nil {
return
}
} else {
o.Message = string(bytes.Join(append(lines[i+1:]), []byte{'\n'}))
break
}
}
return
}
func (c *Color) UnmarshalText(b []byte) (err error) {
s := string(b)
if s == "none" {
c.RGBA.R = 0x00
c.RGBA.G = 0x00
c.RGBA.B = 0x00
c.RGBA.A = 0x00
return nil
}
var buf [4]byte
switch len(b) {
case 6:
_, err = hex.Decode(buf[:3], b)
buf[3] = 0xFF
case 8:
_, err = hex.Decode(buf[:], b)
default:
return fmt.Errorf("Color.UnmarshalText: expected a hexadecimal string in the form RRGGBB or RRGGBBAA, or \"none\" (not %q)", s)
}
if err != nil {
return fmt.Errorf("Color.UnmarshalText: expected a hexadecimal string in the form RRGGBB or RRGGBBAA, or \"none\" (not %q)", s)
}
c.RGBA.R = buf[0]
c.RGBA.G = buf[1]
c.RGBA.B = buf[2]
c.RGBA.A = buf[3]
return nil
}
func parseColor(colors []string) []dmx.Color {
dmxcolors := make([]dmx.Color, 0, len(colors))
for _, color := range colors {
var data [1]byte
_, err := hex.Decode(data[:], []byte(color[:2]))
if err != nil {
panic(err)
}
r := data[0]
_, err = hex.Decode(data[:], []byte(color[2:4]))
if err != nil {
panic(err)
}
g := data[0]
_, err = hex.Decode(data[:], []byte(color[4:6]))
if err != nil {
panic(err)
}
b := data[0]
dmxcolors = append(dmxcolors, dmx.Color{r, g, b})
}
return dmxcolors
}
func (d *UUID) byte_set(uuid []byte) (err error) {
t_uuid := [16]byte{}
t_d := bytes.Split(uuid, []byte{'-'})
if len(t_d) != 5 {
return errors.New("not a uuid : [" + string(uuid) + "]")
}
if len(t_d[0]) != 8 {
return errors.New("not a uuid : [" + string(uuid) + "]")
}
_, err = hex.Decode(t_uuid[0:4], t_d[0])
if err != nil {
return
}
if len(t_d[1]) != 4 || len(t_d[2]) != 4 || len(t_d[3]) != 4 {
return errors.New("not a uuid : [" + string(uuid) + "]")
}
_, err = hex.Decode(t_uuid[4:6], t_d[1])
if err != nil {
return
}
_, err = hex.Decode(t_uuid[6:8], t_d[2])
if err != nil {
return
}
_, err = hex.Decode(t_uuid[8:10], t_d[3])
if err != nil {
return
}
if len(t_d[4]) != 12 {
return errors.New("not a uuid : [" + string(uuid) + "]")
}
_, err = hex.Decode(t_uuid[10:16], t_d[4])
if err != nil {
return
}
switch t_uuid[6] & 0xf0 {
case UUIDv1, UUIDv2, UUIDv3, UUIDv4, UUIDv5:
default:
return errors.New("unknown version : [" + string(uuid) + "]")
}
switch {
case (t_uuid[8] & 0x80) == UUID_NCS:
case (t_uuid[8] & 0xc0) == UUID_RFC:
case (t_uuid[8] & 0xe0) == UUID_MS:
case (t_uuid[8] & 0xe0) == UUID_UNUSED:
default:
err = errors.New("unknown variant : [" + string(uuid) + "]")
return
}
*d = UUID(t_uuid)
return nil
}
// Converts a string representation of a UUID into a UUID object.
func FromString(s string) (u UUID, e error) {
if len(s) != UUIDStringLen {
return nil, &BadUUIDStringError{"length is not 36 bytes: " + s}
}
// Make enough space for the storage.
u = make([]byte, UUIDByteLen)
s_byte := []byte(s)
var i int
var err error
i, err = hex.Decode(u[0:4], s_byte[0:8])
if err != nil || i != 4 {
return nil, &BadUUIDStringError{"Invalid first component: " + s}
}
if s_byte[8] != '-' {
return nil, &BadUUIDStringError{"Position 8 is not a dash: " + s}
}
i, err = hex.Decode(u[4:6], s_byte[9:13])
if err != nil || i != 2 {
return nil, &BadUUIDStringError{"Invalid second component: " + s}
}
if s_byte[13] != '-' {
return nil, &BadUUIDStringError{"Position 13 is not a dash: " + s}
}
i, err = hex.Decode(u[6:8], s_byte[14:18])
if err != nil || i != 2 {
return nil, &BadUUIDStringError{"Invalid third component: " + s}
}
if s_byte[18] != '-' {
return nil, &BadUUIDStringError{"Position 18 is not a dash: " + s}
}
i, err = hex.Decode(u[8:10], s_byte[19:23])
if err != nil || i != 2 {
return nil, &BadUUIDStringError{"Invalid fourth component: " + s}
}
if s_byte[23] != '-' {
return nil, &BadUUIDStringError{"Position 23 is not a dash: " + s}
}
i, err = hex.Decode(u[10:16], s_byte[24:36])
if err != nil || i != 6 {
return nil, &BadUUIDStringError{"Invalid fifth component: " + s}
}
if u[8]&0xc0 != 0x80 {
return nil, &BadUUIDStringError{"Reserved bits used: " + s}
}
return u, nil
}
// SetHex takes two hexidecimal strings and decodes them into the receiver.
func (p *Point) SetHex(x, y string) error {
if len(x) != 64 || len(y) != 64 {
return errors.New("invalid hex string length")
}
if _, err := hex.Decode(p.x[:], []byte(x)); err != nil {
return err
}
_, err := hex.Decode(p.y[:], []byte(y))
return err
}
// returns true if the sha256 hex password hash (of $name|$pass)
// stored at $basePath/$name/.password matches the user/pass
// arguements here.
func (a *authorizer) Authorized(name, pass string) bool {
nameCleaned := cleanUser(name)
// basically, if we detect any path manipulation stuff, bail
if len(nameCleaned) == 0 || nameCleaned != name || strings.Index(nameCleaned, "/") != -1 {
return false
}
passwordPath := path.Join(a.basePath, ".auth", nameCleaned)
expectedHashHex, err := ioutil.ReadFile(passwordPath)
if err != nil {
log.Print("reading password file failed: ", err)
return false
}
expectedHash := make([]byte, sha256.Size)
_, err = hex.Decode(expectedHash, expectedHashHex)
if err != nil {
log.Printf("%s: hex.Decode: %s\n", passwordPath, err)
return false
}
// hash the user supplied password
inputHash := sha256.New()
inputHash.Write([]byte(nameCleaned))
inputHash.Write([]byte("|"))
inputHash.Write([]byte(pass))
// and check if it matches the one on disk
return subtle.ConstantTimeCompare(expectedHash, inputHash.Sum(nil)) == 1
}
func (a authCookieSha1) HandleData(data []byte) ([]byte, AuthStatus) {
challenge := make([]byte, len(data)/2)
_, err := hex.Decode(challenge, data)
if err != nil {
return nil, AuthError
}
b := bytes.Split(challenge, []byte{' '})
if len(b) != 3 {
return nil, AuthError
}
context := b[0]
id := b[1]
svchallenge := b[2]
cookie := a.getCookie(context, id)
if cookie == nil {
return nil, AuthError
}
clchallenge := a.generateChallenge()
if clchallenge == nil {
return nil, AuthError
}
hash := sha1.New()
hash.Write(bytes.Join([][]byte{svchallenge, clchallenge, cookie}, []byte{':'}))
hexhash := make([]byte, 2*hash.Size())
hex.Encode(hexhash, hash.Sum(nil))
data = append(clchallenge, ' ')
data = append(data, hexhash...)
resp := make([]byte, 2*len(data))
hex.Encode(resp, data)
return resp, AuthOk
}
//NewSimpleSessionManager returns an instance of seven5.SessionManager.
//This keeps the sessions in memory, not on disk or database but does try to
//insure that sessions are stable across runs by encrypting the session ids
//with a key only the session manager knows. The key must be supplied in
//the environment variable SERVER_SESSION_KEY or this function panics. That
//key should be a 32 character hex string (see key2hex). If you pass nil
//as your generator, we are assuming that you will explicitly connect each
//user session via a call to Assign.
func NewSimpleSessionManager(g Generator) *SimpleSessionManager {
if os.Getenv("SERVER_SESSION_KEY") == "" {
log.Fatalf("unable to find environment variable SERVER_SESSION_KEY")
}
keyRaw := strings.TrimSpace(os.Getenv("SERVER_SESSION_KEY"))
if len(keyRaw) != aes.BlockSize*2 {
log.Fatalf("expected SERVER_SESSION_KEY length to be %d, but was %d", aes.BlockSize*2, len(keyRaw))
}
buf := make([]byte, aes.BlockSize)
l, err := hex.Decode(buf, []byte(keyRaw))
if err != nil {
log.Fatalf("Unable to decode SERVER_SESSION_KEY, maybe it's not in hex? %v", err)
}
if l != aes.BlockSize {
log.Fatalf("expected SERVER_SESSION_KEY decoded length to be %d, but was %d", aes.BlockSize, l)
}
key := buf[0:l]
result := &SimpleSessionManager{
out: make(chan *sessionPacket),
generator: g,
}
go handleSessionChecks(result.out, key)
return result
}
func copyBinary(sourceName, targetName, sourceDir, targetDir string) error {
source := filepath.Join(sourceDir, sourceName)
dest := filepath.Join(targetDir, targetName)
if _, err := os.Stat(source); err != nil {
if os.IsNotExist(err) {
return fmt.Errorf("missing file %s", source)
}
return err
}
if err := CopyFile(source, dest, 0755); err != nil {
return err
}
if b, err := ioutil.ReadFile(source + ".sha256"); err == nil {
if i := bytes.IndexRune(b, ' '); i > 0 {
b = b[:i]
}
expectedHash := make([]byte, hex.DecodedLen(len(b)))
if _, err := hex.Decode(expectedHash, b); err != nil {
return err
}
if err := hashCheck(dest, expectedHash, sha256.New()); err != nil {
return err
}
}
return nil
}
func DecodePrivateKeyString(privateKeyString string) [32]byte {
var privateKey [32]byte
_, err := hex.Decode(privateKey[:], []byte(privateKeyString))
checkFatal(err)
return privateKey
}
// ParseString converts an UUID in string form to object.
func ParseString(str string) (*UUID, error) {
text := []byte(str)
if len(text) < 32 {
return nil, errors.New("Invalid UUID: ", str)
}
uuid := new(UUID)
b := uuid.Bytes()
for _, byteGroup := range byteGroups {
if text[0] == '-' {
text = text[1:]
}
_, err := hex.Decode(b[:byteGroup/2], text[:byteGroup])
if err != nil {
return nil, err
}
text = text[byteGroup:]
b = b[byteGroup/2:]
}
return uuid, nil
}
// TODO: leverage a full functional UUID library
func UUIDToID(uuid string) (v ID, err error) {
text := []byte(uuid)
if len(text) < 32 {
err = log.Error("uuid: invalid UUID string: %s", text)
return
}
b := v[:]
for _, byteGroup := range byteGroups {
if text[0] == '-' {
text = text[1:]
}
_, err = hex.Decode(b[:byteGroup/2], text[:byteGroup])
if err != nil {
return
}
text = text[byteGroup:]
b = b[byteGroup/2:]
}
return
}
// Sign the given hex-endcoded hash checksum and return a Signature
// @@TODO Remove this -- undeeded
func (pk PrivateKey) SignSHA256(hexbytes []byte) (Signature, error) {
if hex.DecodedLen(len(hexbytes)) != sha256.Size {
return nil, ErrPrivateKeySHA256
}
// Decode hex bytes into raw bytes
decodedBytes := make([]byte, hex.DecodedLen(len(hexbytes)))
_, err := hex.Decode(decodedBytes, hexbytes)
if err != nil {
return nil, errors.Wrap(err, ErrPrivateKeySHA256)
}
// Get the rsa cryptokey for signing
cryptoKey, err := pk.GetCryptoKey()
if err != nil {
return nil, errors.Wrap(err, ErrPrivatKeySign)
}
// Compute the signature and return the results
rawSignature, err := rsa.SignPKCS1v15(rand.Reader, cryptoKey, crypto.SHA256, decodedBytes)
if err != nil {
return nil, errors.Wrap(err, ErrPrivatKeySign)
}
return Signature(rawSignature), nil
}
func NewMemoryDB(path string) (*MemoryDB, error) {
mem := NewEmptyMemoryDB()
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
r, err := gzip.NewReader(f)
if err != nil {
return nil, err
}
defer r.Close()
scanner := bufio.NewScanner(r)
for scanner.Scan() {
parts := strings.Split(scanner.Text(), ":")
var nodeid data.Hash256
if _, err := hex.Decode(nodeid[:], []byte(parts[0])); err != nil {
return nil, err
}
value, err := hex.DecodeString(parts[1])
if err != nil {
return nil, err
}
node, err := data.ReadPrefix(bytes.NewReader(value), nodeid)
if err != nil {
return nil, err
}
mem.nodes[nodeid] = node
}
if scanner.Err() != nil {
return nil, scanner.Err()
}
return mem, nil
}
func startTCP(cb func([]byte)) net.Listener {
listener, err := net.Listen("tcp", ":0")
if err != nil {
log.Fatal("Can't start:", err)
}
go func() {
for {
conn, _ := listener.Accept()
defer conn.Close()
go func() {
reader := bufio.NewReader(conn)
scanner := bufio.NewScanner(reader)
for scanner.Scan() {
encodedPayload := scanner.Bytes()
// Hex encoding always 2x number of bytes
decoded := make([]byte, len(encodedPayload)/2)
hex.Decode(decoded, encodedPayload)
cb(decoded)
}
}()
}
}()
return listener
}
//given a blob of text to decode, checks a few things and returns either
//the originally given unique id and true or "" and false.
func decryptSessionId(encryptedHex string, block cipher.Block) (string, bool) {
ciphertext := make([]byte, len(encryptedHex)/2)
l, err := hex.Decode(ciphertext, []byte(encryptedHex))
if err != nil {
log.Printf("unable to decode the hex bytes of session id (%s,%d): %v", encryptedHex, len(encryptedHex), err)
return "", false
}
iv := ciphertext[:aes.BlockSize]
stream := cipher.NewCTR(block, iv)
cleartext := make([]byte, l-len(iv))
stream.XORKeyStream(cleartext, ciphertext[aes.BlockSize:])
s := string(cleartext)
if !strings.HasPrefix(s, s5CookiePrefix) {
log.Printf("No cookie prefix found, probably keys changed")
return "", false
}
s = strings.TrimPrefix(s, s5CookiePrefix+":")
parts := strings.Split(s, ",")
if len(parts) != 2 {
log.Printf("Failed to understand parts of session id: %s", s)
return "", false
}
t, err := strconv.ParseInt(parts[1], 10, 64)
if err != nil {
log.Printf("Could not understand expiration time in session id: %s", s)
return "", false
}
expires := time.Unix(t, 0)
if expires.Before(time.Now()) {
return "", false
}
return parts[0], true
}
// Parse address from raw json data
func (a *Address) UnmarshalJSON(data []byte) error {
if len(data) > 2 && data[0] == '"' && data[len(data)-1] == '"' {
data = data[1 : len(data)-1]
}
if len(data) > 2 && data[0] == '0' && data[1] == 'x' {
data = data[2:]
}
if len(data) != 2*AddressLength {
return fmt.Errorf("Invalid address length, expected %d got %d bytes", 2*AddressLength, len(data))
}
n, err := hex.Decode(a[:], data)
if err != nil {
return err
}
if n != AddressLength {
return fmt.Errorf("Invalid address")
}
a.Set(HexToAddress(string(data)))
return nil
}
func readInput(mem *MemoryDB, path string) error {
f, err := os.Open(path)
if err != nil {
return err
}
defer f.Close()
r, err := gzip.NewReader(f)
if err != nil {
return err
}
defer r.Close()
scanner := bufio.NewScanner(r)
for scanner.Scan() {
parts := strings.Split(scanner.Text(), ":")
var nodeid data.Hash256
if _, err := hex.Decode(nodeid[:], []byte(parts[0])); err != nil {
return err
}
value, err := hex.DecodeString(parts[1])
if err != nil {
return err
}
node, err := data.ReadPrefix(bytes.NewReader(value), nodeid)
if err != nil {
return err
}
mem.nodes[nodeid] = node
}
return scanner.Err()
}
func main() {
var err error
argParse()
codec := collatejson.NewCodec(100)
out := make([]byte, 0, len(options.inp)*3+collatejson.MinBufferSize)
if options.encode {
out, err = codec.Encode([]byte(options.inp), out)
if err != nil {
log.Fatal(err)
}
hexout := make([]byte, len(out)*5)
n := hex.Encode(hexout, out)
fmt.Printf("in : %q\n", options.inp)
fmt.Printf("out: %q\n", string(out))
fmt.Printf("hex: %q\n", string(hexout[:n]))
} else if options.decode {
inpbs := make([]byte, len(options.inp)*5)
n, err := hex.Decode(inpbs, []byte(options.inp))
if err != nil {
log.Fatal(err)
}
fmt.Println(n, inpbs[:n])
out, err = codec.Decode([]byte(inpbs[:n]), out)
if err != nil {
log.Fatal(err)
}
fmt.Printf("in : %q\n", options.inp)
fmt.Printf("out: %q\n", string(out))
}
}
// Converting from our Magnet type to URL string.
func TestMagnetString(t *testing.T) {
hex.Decode(exampleMagnet.InfoHash[:], []byte("51340689c960f0778a4387aef9b4b52fd08390cd"))
s := exampleMagnet.String()
if s != exampleMagnetURI {
t.Fatalf("\nexpected:\n\t%q\nactual\n\t%q", exampleMagnetURI, s)
}
}
// Decode decodes the byte-reversed hexadecimal string encoding of a Hash to a
// destination.
func Decode(dst *Hash, src string) error {
// Return error if hash string is too long.
if len(src) > MaxHashStringSize {
return ErrHashStrSize
}
// Hex decoder expects the hash to be a multiple of two. When not, pad
// with a leading zero.
var srcBytes []byte
if len(src)%2 == 0 {
srcBytes = []byte(src)
} else {
srcBytes = make([]byte, 1+len(src))
srcBytes[0] = '0'
copy(srcBytes[1:], src)
}
// Hex decode the source bytes to a temporary destination.
var reversedHash Hash
_, err := hex.Decode(reversedHash[HashSize-hex.DecodedLen(len(srcBytes)):], srcBytes)
if err != nil {
return err
}
// Reverse copy from the temporary hash to destination. Because the
// temporary was zeroed, the written result will be correctly padded.
for i, b := range reversedHash[:HashSize/2] {
dst[i], dst[HashSize-1-i] = reversedHash[HashSize-1-i], b
}
return nil
}
func getShaFor(url string) ([]byte, error) {
res, err := http.Get(url + ".sha1")
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return nil, fmt.Errorf("HTTP Status: %d", res.StatusCode)
}
b, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
b = bytes.TrimSpace(b)
b = b[:40]
s := make([]byte, hex.DecodedLen(len(b)))
if _, err := hex.Decode(s, b); err != nil {
return nil, err
}
return s, nil
}
// Scan implements database/sql Scanner interface.
// It expectes EWKB with SRID 4326 (WGS 84).
func (p *PostGISPoint) Scan(value interface{}) error {
if value == nil {
*p = PostGISPoint{}
return nil
}
v, ok := value.([]byte)
if !ok {
return fmt.Errorf("pq_types: expected []byte, got %T (%v)", value, value)
}
ewkb := make([]byte, hex.DecodedLen(len(v)))
n, err := hex.Decode(ewkb, v)
if err != nil {
return err
}
var ewkbP ewkbPoint
err = binary.Read(bytes.NewReader(ewkb[:n]), binary.LittleEndian, &ewkbP)
if err != nil {
return err
}
if ewkbP.ByteOrder != 1 || ewkbP.WkbType != 0x20000001 || ewkbP.SRID != 4326 {
return fmt.Errorf("pq_types: unexpected ewkb %#v", ewkbP)
}
*p = ewkbP.Point
return nil
}
// Keeps reading shallows until a flush-pkt is found
func decodeShallow(p *Decoder) decoderStateFn {
if !bytes.HasPrefix(p.line, shallow) {
p.error("malformed shallow prefix, found %q... instead", p.line[:len(shallow)])
return nil
}
p.line = bytes.TrimPrefix(p.line, shallow)
if len(p.line) != hashSize {
p.error(fmt.Sprintf(
"malformed shallow hash: wrong length, expected 40 bytes, read %d bytes",
len(p.line)))
return nil
}
text := p.line[:hashSize]
var h plumbing.Hash
if _, err := hex.Decode(h[:], text); err != nil {
p.error("invalid hash text: %s", err)
return nil
}
p.data.Shallows = append(p.data.Shallows, h)
if ok := p.nextLine(); !ok {
return nil
}
if len(p.line) == 0 {
return nil // succesfull parse of the advertised-refs message
}
return decodeShallow
}
// UnmarshalText implements the encoding.TextUnmarshaler interface.
// Following formats are supported:
// "6ba7b810-9dad-11d1-80b4-00c04fd430c8",
// "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}",
// "urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8"
func (u *UUID) UnmarshalText(text []byte) (err error) {
if len(text) < 32 {
err = fmt.Errorf("uuid: invalid UUID string: %s", text)
return
}
if bytes.Equal(text[:9], urnPrefix) {
text = text[9:]
} else if text[0] == '{' {
text = text[1:]
}
b := u[:]
for _, byteGroup := range byteGroups {
if text[0] == '-' {
text = text[1:]
}
_, err = hex.Decode(b[:byteGroup/2], text[:byteGroup])
if err != nil {
return
}
text = text[byteGroup:]
b = b[byteGroup/2:]
}
return
}
func New(buf string) (*UATMsg, error) {
ret := new(UATMsg)
buf = strings.Trim(buf, "\r\n") // Remove newlines.
x := strings.Split(buf, ";") // We want to discard everything before the first ';'.
s := x[0]
// Only want "long" uplink messages.
if (len(s)-1)%2 != 0 || (len(s)-1)/2 != UPLINK_FRAME_DATA_BYTES {
return ret, errors.New(fmt.Sprintf("New UATMsg: short read (%d).", len(s)))
}
if s[0] != '+' { // Only want + ("Uplink") messages currently. - (Downlink) or messages that start with other are discarded.
return ret, errors.New("New UATMsg: expecting uplink frames.")
}
s = s[1:]
// Convert the hex string into a byte array.
frame := make([]byte, UPLINK_FRAME_DATA_BYTES)
hex.Decode(frame, []byte(s))
ret.msg = frame
return ret, nil
}
func parseInput(buf string) []byte {
buf = strings.Trim(buf, "\r\n") // Remove newlines.
x := strings.Split(buf, ";") // We want to discard everything before the first ';'.
if len(x) == 0 {
return nil
}
s := x[0]
if len(s) == 0 {
return nil
}
if s[0] != '+' {
return nil // Only want + ("Uplink") messages currently. - (Downlink) or messages that start with other are discarded.
}
s = s[1:]
if len(s)%2 != 0 { // Bad format.
return nil
}
if len(s)/2 != UPLINK_FRAME_DATA_BYTES {
fmt.Printf("UPLINK_FRAME_DATA_BYTES=%d, len(s)=%d\n", UPLINK_FRAME_DATA_BYTES, len(s))
// panic("Error")
return nil
}
// Now, begin converting the string into a byte array.
frame := make([]byte, UPLINK_FRAME_DATA_BYTES)
hex.Decode(frame, []byte(s))
return frame
}
func (m *Middleware) read(from io.Reader) {
reader := bufio.NewReader(from)
var line []byte
var e error
for {
if line, e = reader.ReadBytes('\n'); e != nil {
if e == io.EOF {
continue
} else {
break
}
}
buf := make([]byte, len(line)/2)
if _, err := hex.Decode(buf, line[:len(line)-1]); err != nil {
fmt.Fprintln(os.Stderr, "Failed to decode input payload", err, len(line))
}
if Settings.debug {
Debug("[MIDDLEWARE-MASTER] Received:", string(buf))
}
m.data <- buf
}
return
}