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|
package pulseaudio
import (
"encoding/binary"
"fmt"
"io"
)
type tagType byte
const (
invalidTag tagType = 0
stringTag tagType = 't'
stringNullTag tagType = 'N'
uint32Tag tagType = 'L'
uint8Tag tagType = 'B'
uint64Tag tagType = 'R'
int64Tag tagType = 'r'
sampleSpecTag tagType = 'a'
arbitraryTag tagType = 'x'
trueTag tagType = '1'
falseTag tagType = '0'
timeTag tagType = 'T'
usecTag tagType = 'U'
channelMapTag tagType = 'm'
cvolumeTag tagType = 'v'
propListTag tagType = 'P'
volumeTag tagType = 'V'
formatInfoTag tagType = 'f'
)
func (t tagType) String() string {
switch t {
case invalidTag:
return "invalidTag"
case stringTag:
return "stringTag"
case stringNullTag:
return "stringNullTag"
case uint32Tag:
return "uint32Tag"
case uint8Tag:
return "uint8Tag"
case uint64Tag:
return "uint64Tag"
case int64Tag:
return "int64Tag"
case sampleSpecTag:
return "sampleSpecTag"
case arbitraryTag:
return "arbitraryTag"
case trueTag:
return "trueTag"
case falseTag:
return "falseTag"
case timeTag:
return "timeTag"
case usecTag:
return "usecTag"
case channelMapTag:
return "channelMapTag"
case cvolumeTag:
return "cvolumeTag"
case propListTag:
return "propListTag"
case volumeTag:
return "volumeTag"
case formatInfoTag:
return "formatInfoTag"
default:
return fmt.Sprintf("UnknownValue(%d)", t)
}
}
type binaryReader interface {
readFrom(r io.Reader, c *Client) error
}
func bwrite(w io.Writer, data ...interface{}) error {
for _, v := range data {
if propList, ok := v.(map[string]string); ok {
err := bwrite(w, propListTag)
if err != nil {
return err
}
for k, v := range propList {
if v == "" {
continue
}
l := uint32(len(v) + 1) // +1 for null at the end of string
err := bwrite(w,
stringTag, []byte(k), byte(0),
uint32Tag, l,
arbitraryTag, l,
[]byte(v), byte(0),
)
if err != nil {
return err
}
}
err = bwrite(w, stringNullTag)
if err != nil {
return err
}
continue
}
if cvolume, ok := v.(cvolume); ok {
arr := []uint32(cvolume)
err := bwrite(w, cvolumeTag, byte(len(arr)), arr)
if err != nil {
return err
}
continue
}
if err := binary.Write(w, binary.BigEndian, v); err != nil {
return err
}
}
return nil
}
func bread(r io.Reader, data ...interface{}) error {
nullString := false
for _, v := range data {
if nullString {
nullString = false
continue
}
t, ok := v.(tagType)
if ok {
var tt tagType
if err := binary.Read(r, binary.BigEndian, &tt); err != nil {
return err
}
// if we get a null string, we want to skip the next data reading cycle, as the string will be initialized as empty
// and we want to exit this cycle, as we now know it's a null string. That's why we have the weird bool flag, to
// essentially "continue" twice.
if tt == stringNullTag {
nullString = true
continue
}
if tt != t {
return fmt.Errorf("Protcol error: Got type %s but expected %s", tt, t)
}
continue
}
sptr, ok := v.(*string)
if ok {
buf := make([]byte, 1024) // max string length i guess.
i := 0
for {
_, err := r.Read(buf[i : i+1])
if err != nil {
return err
}
if buf[i] == 0 {
*sptr = string(buf[:i])
break
} else {
if i > len(buf) {
return fmt.Errorf("String is too long (max %d bytes)", len(buf))
}
i++
}
}
continue
}
propList, ok := v.(*map[string]string)
if ok {
*propList = make(map[string]string)
err := bread(r, propListTag)
if err != nil {
return err
}
for {
var t tagType
if err = bread(r, &t); err != nil {
return err
}
if t == stringNullTag {
// end of the proplist.
break
}
if t != stringTag {
return fmt.Errorf("Protcol error: Got type %s but expected %s", t, stringTag)
}
var k, v string
var l1, l2 uint32
if err = bread(r,
&k,
uint32Tag, &l1,
arbitraryTag, &l2,
&v,
); err != nil {
return err
}
if len(v) != int(l1-1) || len(v) != int(l2-1) {
return fmt.Errorf("Protocol error: Proplist value length mismatch (len %d, arb len %d, value len %d)",
l1, l2, len(v))
}
(*propList)[k] = v
}
continue
}
rdr, ok := v.(io.ReaderFrom)
if ok {
if _, err := rdr.ReadFrom(r); err != nil {
return err
}
continue
}
bptr, ok := v.(*bool)
if ok {
var tt tagType
if err := binary.Read(r, binary.BigEndian, &tt); err != nil {
return err
}
if tt == trueTag {
*bptr = true
} else if tt == falseTag {
*bptr = false
} else {
return fmt.Errorf("Protcol error: Got type %s but expected boolean true or false", tt)
}
continue
}
if err := binary.Read(r, binary.BigEndian, v); err != nil {
return err
}
}
return nil
}
|
