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encoder_amf0.go
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encoder_amf0.go
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package amf
import (
"encoding/binary"
"io"
"reflect"
)
// amf0 polymorphic router
func (e *Encoder) EncodeAmf0(w io.Writer, val interface{}) (int, error) {
if val == nil {
return e.EncodeAmf0Null(w, true)
}
v := reflect.ValueOf(val)
if !v.IsValid() {
return e.EncodeAmf0Null(w, true)
}
switch v.Kind() {
case reflect.String:
str := v.String()
if len(str) <= AMF0_STRING_MAX {
return e.EncodeAmf0String(w, str, true)
} else {
return e.EncodeAmf0LongString(w, str, true)
}
case reflect.Bool:
return e.EncodeAmf0Boolean(w, v.Bool(), true)
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return e.EncodeAmf0Number(w, float64(v.Int()), true)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return e.EncodeAmf0Number(w, float64(v.Uint()), true)
case reflect.Float32, reflect.Float64:
return e.EncodeAmf0Number(w, float64(v.Float()), true)
case reflect.Array, reflect.Slice:
length := v.Len()
arr := make(Array, length)
for i := 0; i < length; i++ {
arr[i] = v.Index(int(i)).Interface()
}
return e.EncodeAmf0StrictArray(w, arr, true)
case reflect.Map:
obj, ok := val.(Object)
if ok != true {
return 0, Error("encode amf0: unable to create object from map")
}
return e.EncodeAmf0Object(w, obj, true)
}
if _, ok := val.(TypedObject); ok {
return 0, Error("encode amf0: unsupported type typed object")
}
return 0, Error("encode amf0: unsupported type %s", v.Type())
}
// marker: 1 byte 0x00
// format: 8 byte big endian float64
func (e *Encoder) EncodeAmf0Number(w io.Writer, val float64, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_NUMBER_MARKER); err != nil {
return
}
n += 1
}
err = binary.Write(w, binary.BigEndian, &val)
if err != nil {
return
}
n += 8
return
}
// marker: 1 byte 0x01
// format: 1 byte, 0x00 = false, 0x01 = true
func (e *Encoder) EncodeAmf0Boolean(w io.Writer, val bool, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_BOOLEAN_MARKER); err != nil {
return
}
n += 1
}
var m int
buf := make([]byte, 1)
if val {
buf[0] = AMF0_BOOLEAN_TRUE
} else {
buf[0] = AMF0_BOOLEAN_FALSE
}
m, err = w.Write(buf)
if err != nil {
return
}
n += m
return
}
// marker: 1 byte 0x02
// format:
// - 2 byte big endian uint16 header to determine size
// - n (size) byte utf8 string
func (e *Encoder) EncodeAmf0String(w io.Writer, val string, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_STRING_MARKER); err != nil {
return
}
n += 1
}
var m int
length := uint16(len(val))
err = binary.Write(w, binary.BigEndian, length)
if err != nil {
return n, Error("encode amf0: unable to encode string length: %s", err)
}
n += 2
m, err = w.Write([]byte(val))
if err != nil {
return n, Error("encode amf0: unable to encode string value: %s", err)
}
n += m
return
}
// marker: 1 byte 0x03
// format:
// - loop encoded string followed by encoded value
// - terminated with empty string followed by 1 byte 0x09
func (e *Encoder) EncodeAmf0Object(w io.Writer, val Object, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_OBJECT_MARKER); err != nil {
return
}
n += 1
}
var m int
for k, v := range val {
m, err = e.EncodeAmf0String(w, k, false)
if err != nil {
return n, Error("encode amf0: unable to encode object key: %s", err)
}
n += m
m, err = e.EncodeAmf0(w, v)
if err != nil {
return n, Error("encode amf0: unable to encode object value: %s", err)
}
n += m
}
m, err = e.EncodeAmf0String(w, "", false)
if err != nil {
return n, Error("encode amf0: unable to encode object empty string: %s", err)
}
n += m
err = WriteMarker(w, AMF0_OBJECT_END_MARKER)
if err != nil {
return n, Error("encode amf0: unable to object end marker: %s", err)
}
n += 1
return
}
// marker: 1 byte 0x05
// no additional data
func (e *Encoder) EncodeAmf0Null(w io.Writer, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_NULL_MARKER); err != nil {
return
}
n += 1
}
return
}
// marker: 1 byte 0x06
// no additional data
func (e *Encoder) EncodeAmf0Undefined(w io.Writer, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_UNDEFINED_MARKER); err != nil {
return
}
n += 1
}
return
}
// marker: 1 byte 0x08
// format:
// - 4 byte big endian uint32 with length of associative array
// - normal object format:
// - loop encoded string followed by encoded value
// - terminated with empty string followed by 1 byte 0x09
func (e *Encoder) EncodeAmf0EcmaArray(w io.Writer, val Object, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_ECMA_ARRAY_MARKER); err != nil {
return
}
n += 1
}
var m int
length := uint32(len(val))
err = binary.Write(w, binary.BigEndian, length)
if err != nil {
return n, Error("encode amf0: unable to encode ecma array length: %s", err)
}
n += 4
m, err = e.EncodeAmf0Object(w, val, false)
if err != nil {
return n, Error("encode amf0: unable to encode ecma array object: %s", err)
}
n += m
return
}
// marker: 1 byte 0x0a
// format:
// - 4 byte big endian uint32 to determine length of associative array
// - n (length) encoded values
func (e *Encoder) EncodeAmf0StrictArray(w io.Writer, val Array, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_STRICT_ARRAY_MARKER); err != nil {
return
}
n += 1
}
var m int
length := uint32(len(val))
err = binary.Write(w, binary.BigEndian, length)
if err != nil {
return n, Error("encode amf0: unable to encode strict array length: %s", err)
}
n += 4
for _, v := range val {
m, err = e.EncodeAmf0(w, v)
if err != nil {
return n, Error("encode amf0: unable to encode strict array element: %s", err)
}
n += m
}
return
}
// marker: 1 byte 0x0c
// format:
// - 4 byte big endian uint32 header to determine size
// - n (size) byte utf8 string
func (e *Encoder) EncodeAmf0LongString(w io.Writer, val string, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_LONG_STRING_MARKER); err != nil {
return
}
n += 1
}
var m int
length := uint32(len(val))
err = binary.Write(w, binary.BigEndian, length)
if err != nil {
return n, Error("encode amf0: unable to encode long string length: %s", err)
}
n += 4
m, err = w.Write([]byte(val))
if err != nil {
return n, Error("encode amf0: unable to encode long string value: %s", err)
}
n += m
return
}
// marker: 1 byte 0x0d
// no additional data
func (e *Encoder) EncodeAmf0Unsupported(w io.Writer, encodeMarker bool) (n int, err error) {
if encodeMarker {
if err = WriteMarker(w, AMF0_UNSUPPORTED_MARKER); err != nil {
return
}
n += 1
}
return
}
// marker: 1 byte 0x11
func (e *Encoder) EncodeAmf0Amf3Marker(w io.Writer) error {
return WriteMarker(w, AMF0_ACMPLUS_OBJECT_MARKER)
}