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afc.go
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afc.go
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package libimobiledevice
import (
"bytes"
"encoding/hex"
"fmt"
)
const AfcServiceName = "com.apple.afc"
func NewAfcClient(innerConn InnerConn) *AfcClient {
return &AfcClient{
innerConn: innerConn,
}
}
type AfcClient struct {
innerConn InnerConn
packetNum uint64
}
func (c *AfcClient) newPacket(operation uint64, data, payload []byte) Packet {
c.packetNum++
pkt := &afcPacket{
operation: operation,
packetNum: c.packetNum,
entireLen: 40,
thisLen: 40,
}
if data != nil {
n := uint64(len(data))
pkt.entireLen += n
pkt.thisLen += n
}
if payload != nil {
pkt.entireLen += uint64(len(payload))
}
return pkt
}
func (c *AfcClient) Send(operation uint64, data, payload []byte) (err error) {
pkt := c.newPacket(operation, data, payload)
var raw []byte
if raw, err = pkt.Pack(); err != nil {
return fmt.Errorf("send packet (afc): %w", err)
}
buf := new(bytes.Buffer)
buf.Write(raw)
if data != nil {
debugLog(fmt.Sprintf("--> %s ...afc data...\n", pkt))
buf.Write(data)
} else {
debugLog(fmt.Sprintf("--> %s\n", pkt))
}
if err = c.innerConn.Write(buf.Bytes()); err != nil {
return fmt.Errorf("send packet (afc): %w", err)
}
if payload != nil {
if err = c.innerConn.Write(payload); err != nil {
return fmt.Errorf("send packet (afc): %w", err)
}
}
return
}
func (c *AfcClient) Receive() (respMsg *AfcMessage, err error) {
var bufHeader []byte
if bufHeader, err = c.innerConn.Read(40); err != nil {
return nil, fmt.Errorf("receive packet (afc): %w", err)
}
buffer := new(bytes.Buffer)
buffer.Write(bufHeader)
var respPkt *afcPacket
if respPkt, err = new(afcPacket).unpack(buffer); err != nil {
return nil, fmt.Errorf("receive packet (afc): %w", err)
}
respMsg = new(AfcMessage)
respMsg.Operation = respPkt.operation
buffer.Reset()
if respPkt.entireLen > 40 {
length := int(respPkt.entireLen - 40)
var bufDataAndPayload []byte
if bufDataAndPayload, err = c.innerConn.Read(length); err != nil {
return nil, fmt.Errorf("receive packet (afc): %w", err)
}
buffer.Write(bufDataAndPayload)
}
bufData := make([]byte, respPkt.thisLen-40)
if _, err = buffer.Read(bufData); err != nil {
return nil, fmt.Errorf("receive packet (afc buffer): %w", err)
}
respMsg.Data = bufData
respMsg.Payload = buffer.Bytes()
debugLog(fmt.Sprintf("<-- %s\n%s\n%s", respPkt, hex.Dump(respMsg.Data), hex.Dump(respMsg.Payload)))
return
}