func parseColumnType(buf *bytes.Buffer) (columnInfo, error) {
var result columnInfo
b, err := buf.ReadByte()
//fmt.Printf("% X \n", buf.Bytes())
if err != nil {
return result, err
}
ctype := columnType(b)
result.columnType = ctype
// So what follows might be the most useless switch statement in the world. Even the default clause is useless as it will never get executed, unless I really did something wrong.
switch ctype & 0x30 {
case 0x16:
//Zero-length token, nothing to do
case 0x30:
//Above is the same as:
//case NULLTYPE, INT1TYPE, BITTYPE, INT2TYPE, INT4TYPE, DATETIM4TYPE, FLT4TYPE, MONEY4TYPE, MONEYTYPE, DATETIMETYPE, FLT8TYPE, INT8TYPE:
// Nothing to do for these, length is contained within type
case 0x20:
// Variable-length token, length is contained in value
case 0x0:
// Variable count token,
default:
panic(fmt.Sprintf("unknown column type: %x", b))
}
return result, nil
}
func (t *tScreen) parseFunctionKey(buf *bytes.Buffer) (bool, bool) {
b := buf.Bytes()
partial := false
for e, k := range t.keycodes {
esc := []byte(e)
if (len(esc) == 1) && (esc[0] == '\x1b') {
continue
}
if bytes.HasPrefix(b, esc) {
// matched
var r rune
if len(esc) == 1 {
r = rune(b[0])
}
mod := k.mod
if t.escaped {
mod |= ModAlt
t.escaped = false
}
ev := NewEventKey(k.key, r, mod)
t.PostEvent(ev)
for i := 0; i < len(esc); i++ {
buf.ReadByte()
}
return true, true
}
if bytes.HasPrefix(esc, b) {
partial = true
}
}
return partial, false
}
func decodeNextDictFrom(buffer *bytes.Buffer) (Dict, error) {
initial, err := buffer.ReadByte()
if initial != 'd' || err != nil {
panic("How is this not a dictionary?")
}
result := make(Dict, 0)
AccumulateItems:
for {
nextByte, err := buffer.ReadByte()
switch {
case err != nil:
return nil, err
case nextByte == 'e':
break AccumulateItems
default:
buffer.UnreadByte()
key, err := decodeNextStringFrom(buffer)
if err != nil {
return nil, err
}
value, err := decodeNextFrom(buffer)
if err != nil {
return nil, err
}
result[key] = value
}
}
return result, nil
}
func decodeNextFrom(buffer *bytes.Buffer) (Bencodable, error) {
nextByte, err := buffer.ReadByte()
if err != nil {
return nil, err
}
buffer.UnreadByte()
var result Bencodable
switch nextByte {
case 'i':
result, err = decodeNextIntFrom(buffer)
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
result, err = decodeNextStringFrom(buffer)
case 'l':
result, err = decodeNextListFrom(buffer)
case 'd':
result, err = decodeNextDictFrom(buffer)
default:
err = errors.New(fmt.Sprintf(
"Unexpected initial byte in bencoded data: %v",
strconv.Quote(string(nextByte))))
}
if err != nil {
return nil, err
}
return result, nil
}
func decodeNextListFrom(buffer *bytes.Buffer) (List, error) {
initial, err := buffer.ReadByte()
if initial != 'l' || err != nil {
panic("How is this not a list?")
}
result := make(List, 0)
AccumulateItems:
for {
nextByte, err := buffer.ReadByte()
switch {
case err != nil:
return nil, err
case nextByte == 'e':
break AccumulateItems
default:
buffer.UnreadByte()
value, err := decodeNextFrom(buffer)
if err != nil {
return nil, err
}
result = append(result, value)
}
}
return result, nil
}
// Skip will skip the next field we don't want to read.
func Skip(buf *bytes.Buffer, kind byte) {
switch kind {
case Number, Datetime, Long, Ulong:
Next(buf, 8)
case String:
// length of a string includes the 0 at the end, but not the size
l := int(Pack.Uint32(Next(buf, 4)))
Next(buf, l)
case Object, Array:
// the encoded length includes the 4 bytes for the size
l := int(Pack.Uint32(Next(buf, 4)))
if l < 4 {
panic(NewBsonError("Object or Array should at least be 4 bytes long"))
}
Next(buf, l-4)
case Binary:
// length of a binary doesn't include the subtype
l := int(Pack.Uint32(Next(buf, 4)))
Next(buf, l+1)
case Boolean:
buf.ReadByte()
case Int:
Next(buf, 4)
case Null:
// no op
default:
panic(NewBsonError("unexpected kind %v for skip", kind))
}
}
func parseMeta(buf *bytes.Buffer, repo string) {
var name string
pack := map[string]string{}
pack["REPO"] = repo
_, _ = buf.ReadByte()
for {
key, err := buf.ReadBytes('%')
if err == io.EOF {
break
}
key = bytes.Trim(key, "%")
values, _ := buf.ReadBytes('%')
values = bytes.Trim(values, "%")
values = bytes.Replace(values, []byte("\n"), []byte(" "), -1)
values = bytes.Trim(values, " ")
if string(key) == "NAME" {
name = string(values)
}
pack[string(key)] = string(values)
}
v, _ := packages[name]
if v != nil {
printf("%s exists\n", name)
}
packages[name] = pack
}
func parse(r io.Reader) (*Match, error) {
cmd := exec.Command("pdftotext", "-q", "-enc", "UTF-8", "-eol", "unix", "-layout", "-", "-")
cmd.Stdin = r
stdout := new(bytes.Buffer)
cmd.Stdout = stdout
stderr := new(bytes.Buffer)
cmd.Stderr = stderr
err := cmd.Run()
if err != nil {
return nil, err
}
m := new(Match)
m.Results = make(map[Division][]Result)
for {
if err := parsePage(stdout, m); err != nil {
return nil, err
}
if _, err := stdout.ReadByte(); err == io.EOF {
return m, nil
} else {
stdout.UnreadByte()
}
}
}
// decodeTrack will decode a single track from the supplied buffer,
// and return it.
// The buffer is forwarded to the end of the track data.
// If not more tracks can be found io.EOF will be returned.
func decodeTrack(r *bytes.Buffer) (*Track, error) {
t := &Track{}
// Read track header
th := trackHeader{}
err := binary.Read(r, binary.BigEndian, &th)
if err != nil {
return nil, err
}
t.Instrument.ID = th.ID
err = t.Instrument.decodeName(r, int(th.NameLen))
if err != nil {
return nil, err
}
// Read beats
t.Steps = make([]Step, SpliceTrackLength)
for i := range t.Steps {
c, err := r.ReadByte()
if err != nil {
return nil, err
}
t.Steps[i] = Step(c)
}
return t, nil
}
// Skip will skip a field we don't want to read
func Skip(buf *bytes.Buffer, kind byte) {
switch kind {
case Number:
buf.Next(8)
case String:
// length of a string includes the 0 at the end, but not the size
l := int(Pack.Uint32(buf.Next(4)))
buf.Next(l)
case Object, Array:
// the encoded length includes the 4 bytes for the size
l := int(Pack.Uint32(buf.Next(4)))
if l < 4 {
panic(NewBsonError("Object or Array should at least be 4 bytes long"))
}
buf.Next(l - 4)
case Binary:
// length of a binary doesn't include the subtype
l := int(Pack.Uint32(buf.Next(4)))
buf.Next(l + 1)
case Boolean:
buf.ReadByte()
case Datetime:
buf.Next(8)
case Int:
buf.Next(4)
case Long:
buf.Next(8)
case Ulong:
buf.Next(8)
case Null:
// no op
default:
panic(NewBsonError("don't know how to skip kind %v yet", kind))
}
}
// TestGetPasswd_Err tests errors are properly handled from getch()
func TestGetPasswd_Err(t *testing.T) {
var inBuffer *bytes.Buffer
getch = func() (byte, error) {
b, err := inBuffer.ReadByte()
if err != nil {
return 13, err
}
if b == 'z' {
return 'z', fmt.Errorf("Forced error; byte returned should not be considered accurate.")
}
return b, nil
}
defer func() { getch = defaultGetCh }()
for input, expectedPassword := range map[string]string{"abc": "abc", "abzc": "ab"} {
inBuffer = bytes.NewBufferString(input)
p, err := GetPasswdMasked()
if string(p) != expectedPassword {
t.Errorf("Expected %q but got %q instead.", expectedPassword, p)
}
if err == nil {
t.Errorf("Expected error to be returned.")
}
}
}
// ReadFrame reads an entire frame into memory.
func ReadFrame(r io.Reader) (f Frame, err error) {
headBuffer := new(bytes.Buffer)
_, err = io.CopyN(headBuffer, r, frameHeadSize)
if err != nil {
return
}
if headBuffer.Bytes()[0]&0x80 == 0 {
// Data
df := DataFrame{}
err = readBinary(headBuffer, &df.StreamID, &df.Flags)
if err != nil {
return
}
df.Data, err = readData(r)
f = df
} else {
// Control
cf := ControlFrame{}
headBuffer.ReadByte()
headBuffer.ReadByte() // skip version word
err = readBinary(headBuffer, &cf.Type, &cf.Flags)
if err != nil {
return
}
cf.Data, err = readData(r)
f = cf
}
return
}
func readNextByteAsBool(buffer *bytes.Buffer) bool {
switch byte, _ := buffer.ReadByte(); byte {
case 0x01:
return true
}
return false
}
func (ev *AuthEvent) Decode(buffer *bytes.Buffer) (err error) {
ev.User, err = DecodeStringValue(buffer)
if nil != err {
return err
}
// ev.Mac, err = DecodeStringValue(buffer)
// if nil != err {
// return err
// }
ev.RunId, err = DecodeInt64Value(buffer)
if nil != err {
return err
}
ev.Index, err = DecodeInt64Value(buffer)
if nil != err {
return err
}
ev.IV, err = DecodeUInt64Value(buffer)
if nil != err {
return err
}
ev.EncryptMethod, err = buffer.ReadByte()
if nil != err {
return err
}
//no need to decode Rand, since it's useless
return err
}
func getByte(buff *bytes.Buffer) byte {
v, err := buff.ReadByte()
if err != nil {
panic(err)
}
return v
}
// readFrame reads an entire frame into memory
func readFrame(r io.Reader) (f frame, err error) {
headBuffer := new(bytes.Buffer)
_, err = io.CopyN(headBuffer, r, 5)
if err != nil {
return
}
if headBuffer.Bytes()[0]&0x80 == 0 {
// Data
df := dataFrame{}
err = readBinary(headBuffer, &df.stream, &df.flags)
if err != nil {
return
}
df.data, err = readData(r)
f = df
} else {
// Control
cf := controlFrame{}
headBuffer.ReadByte() // FIXME skip version word
headBuffer.ReadByte()
err = readBinary(headBuffer, &cf.kind, &cf.flags)
if err != nil {
return
}
cf.data, err = readData(r)
f = cf
}
return
}
func read_amf0(r *bytes.Buffer) interface{} {
data_type, _ := r.ReadByte()
switch data_type {
case 0x0:
return read_amf0_number(r)
case 0x1:
return read_amf0_bool(r)
case 0x2:
return read_amf0_string(r)
case 0x3:
return read_amf0_object(r)
case 0x5: //null
return nil
case 0x6: //undefined
return nil
case 0x11: //change to amf3
return read_amf3(r)
default:
fmt.Printf("#unknown type:0x%x\n", data_type)
panic("unknwo type")
}
return nil
}
func assertReadMsg(t *testing.T, s *bytes.Buffer, m *testMsg) {
ty, id, name, wait, size, err := ReadMsg(s)
if err != nil && err != io.EOF {
t.Fatalf("ReadMsg() failed: %v", err.Error())
}
if ty != m.t {
t.Fatalf("ReadMsg() ty = \"%v\", expected \"%v\"", ty, m.t)
}
if id != m.id {
t.Fatalf("ReadMsg() id = \"%v\", expected \"%v\"", id, m.id)
}
if name != m.name {
t.Fatalf("ReadMsg() name = \"%v\", expected \"%v\"", name, m.name)
}
if int(wait) != m.wait {
t.Fatalf("ReadMsg() wait = %v, expected %v", wait, m.wait)
}
if int(size) != m.size {
t.Fatalf("ReadMsg() size = %v, expected %v", size, m.size)
}
// Read payload
if m.t != MsgTypeProtocolError {
for i := 0; i != m.size; i++ {
if b, err := s.ReadByte(); err != nil {
t.Fatalf("ReadMsg() failed to read payload: %v", err.Error())
} else if b != kPayloadByte {
t.Fatalf("ReadMsg() => '%c', expected '%c'", b, kPayloadByte)
}
}
}
}
func (header *commentHeader) read(buffer *bytes.Buffer) {
b, _ := buffer.ReadByte()
if b != 3 {
panic(fmt.Sprintf("Header type == %d, expected type == 3.", b))
}
if string(buffer.Next(6)) != "vorbis" {
panic("vorbis string not found in comment header")
}
var length uint32
binary.Read(buffer, binary.LittleEndian, &length)
header.Vendor_string = string(buffer.Next(int(length)))
binary.Read(buffer, binary.LittleEndian, &length)
header.User_comments = make([]string, length)
for i := range header.User_comments {
binary.Read(buffer, binary.LittleEndian, &length)
header.User_comments[i] = string(buffer.Next(int(length)))
}
framing, _ := buffer.ReadByte()
header.Framing = (framing & 0x1) != 0
if !header.Framing {
panic("Framing bit not set in comment header")
}
}
// DecodeULEB128 decodes an unsigned Little Endian Base 128
// represented number.
func DecodeULEB128(buf *bytes.Buffer) (uint64, uint32) {
var (
result uint64
shift uint64
length uint32
)
if buf.Len() == 0 {
return 0, 0
}
for {
b, err := buf.ReadByte()
if err != nil {
panic("Could not parse ULEB128 value")
}
length++
result |= uint64((uint(b) & 0x7f) << shift)
// If high order bit is 1.
if b&0x80 == 0 {
break
}
shift += 7
}
return result, length
}
// DecodeSLEB128 decodes a signed Little Endian Base 128
// represented number.
func DecodeSLEB128(buf *bytes.Buffer) (int64, uint32) {
var (
b byte
err error
result int64
shift uint64
length uint32
)
if buf.Len() == 0 {
return 0, 0
}
for {
b, err = buf.ReadByte()
if err != nil {
panic("Could not parse SLEB128 value")
}
length++
result |= int64((int64(b) & 0x7f) << shift)
shift += 7
if b&0x80 == 0 {
break
}
}
if (shift < 8*uint64(length)) && (b&0x40 > 0) {
result |= -(1 << shift)
}
return result, length
}
func ByteRWerExample() {
FOREND:
for {
fmt.Println("请输入要通过WriteByte写入的一个ASCII字符（b：返回上级；q：退出）：")
var ch byte
fmt.Scanf("%c\n", &ch)
switch ch {
case 'b':
fmt.Println("返回上级菜单！")
break FOREND
case 'q':
fmt.Println("程序退出！")
os.Exit(0)
default:
buffer := new(bytes.Buffer)
err := buffer.WriteByte(ch)
if err == nil {
fmt.Println("写入一个字节成功！准备读取该字节……")
newCh, _ := buffer.ReadByte()
fmt.Printf("读取的字节：%c\n", newCh)
} else {
fmt.Println("写入错误")
}
}
}
}
// parsePacket publishes event according to data parsed
func (n *Driver) parsePacket(buf *bytes.Buffer) {
for buf.Len() > 0 {
b, _ := buf.ReadByte()
switch b {
case CodeEx:
n.Publish(n.Event("extended"), nil)
case CodeSignalQuality:
ret, _ := buf.ReadByte()
n.Publish(n.Event("signal"), ret)
case CodeAttention:
ret, _ := buf.ReadByte()
n.Publish(n.Event("attention"), ret)
case CodeMeditation:
ret, _ := buf.ReadByte()
n.Publish(n.Event("meditation"), ret)
case CodeBlink:
ret, _ := buf.ReadByte()
n.Publish(n.Event("blink"), ret)
case CodeWave:
buf.Next(1)
var ret = make([]byte, 2)
buf.Read(ret)
n.Publish(n.Event("wave"), int16(ret[0])<<8|int16(ret[1]))
case CodeAsicEEG:
ret := make([]byte, 25)
i, _ := buf.Read(ret)
if i == 25 {
n.Publish(n.Event("eeg"), n.parseEEG(ret))
}
}
}
}
func (header *idHeader) read(buffer *bytes.Buffer) {
b, _ := buffer.ReadByte()
if b != 1 {
panic(fmt.Sprintf("Header type == %d, expected type == 1.", b))
}
if string(buffer.Next(6)) != "vorbis" {
panic("vorbis string not found in id header")
}
binary.Read(buffer, binary.LittleEndian, &header.idHeaderFixed)
var block_sizes uint8
binary.Read(buffer, binary.LittleEndian, &block_sizes)
header.Blocksize_0 = int(1 << (block_sizes & 0x0f))
header.Blocksize_1 = int(1 << ((block_sizes & 0xf0) >> 4))
var framing uint8
binary.Read(buffer, binary.LittleEndian, &framing)
if framing != 1 {
panic("Id header not properly framed")
}
if header.Version != 0 {
panic(fmt.Sprintf("Unexpected version number in id header: %d", header.Version))
}
if header.Channels == 0 {
panic("Channels set to zero in id header")
}
if header.Sample_rate == 0 {
panic("Sample rate set to zero in id header")
}
if header.Blocksize_0 != 64 &&
header.Blocksize_0 != 128 &&
header.Blocksize_0 != 256 &&
header.Blocksize_0 != 512 &&
header.Blocksize_0 != 1024 &&
header.Blocksize_0 != 2048 &&
header.Blocksize_0 != 4096 &&
header.Blocksize_0 != 8192 {
panic(fmt.Sprintf("Invalid block 0 size: %d", header.Blocksize_0))
}
if header.Blocksize_1 != 64 &&
header.Blocksize_1 != 128 &&
header.Blocksize_1 != 256 &&
header.Blocksize_1 != 512 &&
header.Blocksize_1 != 1024 &&
header.Blocksize_1 != 2048 &&
header.Blocksize_1 != 4096 &&
header.Blocksize_1 != 8192 {
panic(fmt.Sprintf("Invalid block 1 size: %d", header.Blocksize_1))
}
if header.Blocksize_0 > header.Blocksize_1 {
panic(fmt.Sprintf("Block 0 size > block 1 size: %d > %d", header.Blocksize_0, header.Blocksize_1))
}
if buffer.Len() > 0 {
// TODO: Shouldn't be anything leftover, log a warning?
}
}
func (c *Compressor) decode(buf *bytes.Buffer) []float64 {
head, _ := buf.ReadByte()
var pred int64
if (head & 0x80) != 0 {
pred = c.pred2.Prediction()
} else {
pred = c.pred1.Prediction()
}
nzb := (head & 0x70) >> 4
if nzb > 3 {
nzb++
}
dst := make([]byte, 8-nzb)
// FIXME: errors
buf.Read(dst)
diff := c.ToLong(dst)
actual := pred ^ diff
c.pred1.Update(actual)
c.pred2.Update(actual)
var ret []float64
ret = append(ret, math.Float64frombits(uint64(actual)))
if (head & 0x08) != 0 {
pred = c.pred2.Prediction()
} else {
pred = c.pred1.Prediction()
}
nzb = head & 0x07
if nzb > 3 {
nzb++
}
dst = make([]byte, 8-nzb)
// FIXME: errors
buf.Read(dst)
diff = c.ToLong(dst)
if nzb == 7 && diff == 0 {
return ret
}
actual = pred ^ diff
c.pred1.Update(actual)
c.pred2.Update(actual)
return append(ret, math.Float64frombits(uint64(actual)))
}
func read_amf0_type_number(r *bytes.Buffer) float64 {
data_type, _ := r.ReadByte()
if data_type != 0x0 {
panic("wrong data type")
}
return read_amf0_number(r)
}
func read_amf0_type_string(r *bytes.Buffer) string {
data_type, _ := r.ReadByte()
if data_type != 0x2 {
panic("wrong data type")
}
return read_amf0_string(r)
}
func readCString(buf *bytes.Buffer) string {
out := bytes.NewBuffer([]byte{})
var c byte
for c, _ = buf.ReadByte(); c != 0; c, _ = buf.ReadByte() {
out.WriteByte(c)
}
return out.String()
}
func readUint16(b *bytes.Buffer) (uint16, error) {
var i uint16 = 0
var n byte = 0
n, _ = b.ReadByte()
i |= uint16(n)
n, _ = b.ReadByte()
i |= uint16(n) << 8
return i, nil
}
func (t *tScreen) scanInput(buf *bytes.Buffer, expire bool) {
for {
b := buf.Bytes()
if len(b) == 0 {
buf.Reset()
return
}
partials := 0
if part, comp := t.parseRune(buf); comp {
continue
} else if part {
partials++
}
if part, comp := t.parseFunctionKey(buf); comp {
continue
} else if part {
partials++
}
// Only parse mouse records if this term claims to have
// mouse support
if t.ti.Mouse != "" {
if part, comp := t.parseXtermMouse(buf); comp {
continue
} else if part {
partials++
}
if part, comp := t.parseSgrMouse(buf); comp {
continue
} else if part {
partials++
}
}
if partials == 0 || expire {
// Nothing was going to match, or we timed out
// waiting for more data -- just deliver the characters
// to the app & let them sort it out. Possibly we should only
// do this for control characters such like ESC.
by, _ := buf.ReadByte()
ev := NewEventKey(KeyRune, rune(by), ModNone)
t.PostEvent(ev)
continue
}
// well we have some partial data, wait until we get
// some more
break
}
}
