Fix client crash and implement quest loading

Fixed client crashes caused by handleMsgMhfEnumeratePrice and handleMsgMhfEnumerateRanking
wherein the server's response didn't contain enough data, causing the client to read uninitalized memory.

Implemented quest loading handlers GetFile, WaitStageBinary, and UnlockStage, as well as correcting the IssueLogkey handler.

network/mhfpacket/msg_sys_get_file.go

@@ -5,8 +5,21 @@ import (
 	"github.com/Andoryuuta/byteframe"
 )
 
+type scenarioFileIdentifer struct {
+	Unk0 uint8
+	Unk1 uint32
+	Unk2 uint8
+	Unk3 uint8
+}
+
 // MsgSysGetFile represents the MSG_SYS_GET_FILE
-type MsgSysGetFile struct{}
+type MsgSysGetFile struct {
+	AckHandle         uint32
+	IsScenario        bool
+	FilenameLength    uint8
+	Filename          string
+	ScenarioIdentifer scenarioFileIdentifer
+}
 
 // Opcode returns the ID associated with this packet type.
 func (m *MsgSysGetFile) Opcode() network.PacketID {
@@ -15,10 +28,23 @@ func (m *MsgSysGetFile) Opcode() network.PacketID {
 
 // Parse parses the packet from binary
 func (m *MsgSysGetFile) Parse(bf *byteframe.ByteFrame) error {
-	panic("Not implemented")
+	m.AckHandle = bf.ReadUint32()
+	m.IsScenario = bf.ReadBool()
+	if m.IsScenario {
+		m.ScenarioIdentifer = scenarioFileIdentifer{
+			bf.ReadUint8(),
+			bf.ReadUint32(),
+			bf.ReadUint8(),
+			bf.ReadUint8(),
+		}
+	} else {
+		m.FilenameLength = bf.ReadUint8()
+		m.Filename = string(bf.ReadBytes(uint(m.FilenameLength)))
+	}
+	return nil
 }
 
 // Build builds a binary packet from the current data.
 func (m *MsgSysGetFile) Build(bf *byteframe.ByteFrame) error {
 	panic("Not implemented")
-}
+}