DNF90 服务端与启动器完整源码（含 GM 工具功能增强）

服务端（Go）： - GM 塞背包/带属性装备发放：在线角色推送 op14 增量物品行，背包实时刷新，无需回角色选择界面 - GM 改金币/改等级：去掉在线拒绝，落库后推送 op14 钱包/op37 等级状态，在线实时刷新 - 等级端点统一切换到新版 GMSetCharacterLevel（自带在线刷新） - 无限/锁死疲劳模式 + 燃烧疲劳：每房间消耗 2 点、打怪与通关经验双倍 - 燃烧疲劳开关时给所有在线角色推送系统提示（op12 mode 0） - 深渊史诗掉率：GM 全局倍率 + 城镇增益药剂窗口倍率，真实接入掉落结算启动器（Python/JS）： - 标题栏自绘、窗口 1204x717、禁止拖拽改大小、仅最小化/关闭 - GM 工具：疲劳与燃烧、深渊史诗掉率、拍卖行上架（单一定价对齐） - 拍卖行上架前端对齐服务端单一价格语义，修复 400 报错
2026-11-04 14:31:55 +08:00
commit 645b64fe21
@@ -0,0 +1,172 @@
+package protocol
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+)
+
+// MaxPacketBodySize 是旧 packet 协议默认 body 上限。
+const MaxPacketBodySize uint32 = 1024 * 1024
+
+// 旧 packet 协议解析错误。
+var (
+	ErrPacketBodyTooLarge = errors.New("protocol packet body is too large")
+	ErrInvalidPacketFlag  = errors.New("protocol packet flag is invalid")
+)
+
+// Packet 是旧 gateway packet 线协议的内存表示。
+type Packet struct {
+	PacketID   int32
+	MsgID      uint32
+	Compressed bool
+	Body       []byte
+}
+
+// ReadPacket 从 reader 读取旧 packet。
+func ReadPacket(r io.Reader, maxBodySize uint32) (Packet, error) {
+	maxBodySize = normMaxPacketBody(maxBodySize)
+	var header [13]byte
+	if _, err := io.ReadFull(r, header[:]); err != nil {
+		return Packet{}, err
+	}
+
+	bodySize := binary.LittleEndian.Uint32(header[0:4])
+	if bodySize > maxBodySize {
+		return Packet{}, fmt.Errorf("%w: %d", ErrPacketBodyTooLarge, bodySize)
+	}
+
+	body := make([]byte, bodySize)
+	if bodySize > 0 {
+		if _, err := io.ReadFull(r, body); err != nil {
+			return Packet{}, err
+		}
+	}
+
+	compressed, err := decodeCompressedFlag(header[12])
+	if err != nil {
+		return Packet{}, err
+	}
+	return Packet{
+		PacketID:   packetIDFromWire(binary.LittleEndian.Uint32(header[4:8])),
+		MsgID:      binary.LittleEndian.Uint32(header[8:12]),
+		Compressed: compressed,
+		Body:       body,
+	}, nil
+}
+
+// WritePacket 把旧 packet 写入 writer。
+func WritePacket(w io.Writer, pkt Packet) error {
+	bodySize := len(pkt.Body)
+	if bodySize > int(MaxPacketBodySize) || uint64(bodySize) > uint64(^uint32(0)) {
+		return fmt.Errorf("%w: %d", ErrPacketBodyTooLarge, bodySize)
+	}
+	var header [13]byte
+	binary.LittleEndian.PutUint32(header[0:4], uint32(bodySize))
+	binary.LittleEndian.PutUint32(header[4:8], packetIDToWire(pkt.PacketID))
+	binary.LittleEndian.PutUint32(header[8:12], pkt.MsgID)
+	if pkt.Compressed {
+		header[12] = 1
+	}
+
+	if bodySize == 0 {
+		return writeFull(w, header[:])
+	}
+	return writeFullBuffers(w, header[:], pkt.Body)
+}
+
+func normMaxPacketBody(maxBodySize uint32) uint32 {
+	if maxBodySize == 0 {
+		return MaxPacketBodySize
+	}
+	return maxBodySize
+}
+
+func decodeCompressedFlag(flag byte) (bool, error) {
+	switch flag {
+	case 0:
+		return false, nil
+	case 1:
+		return true, nil
+	default:
+		return false, fmt.Errorf("%w: compressed=%d", ErrInvalidPacketFlag, flag)
+	}
+}
+
+func writeFull(w io.Writer, data []byte) error {
+	for len(data) > 0 {
+		n, err := w.Write(data)
+		if err != nil {
+			return err
+		}
+		if n <= 0 {
+			return io.ErrShortWrite
+		}
+		data = data[n:]
+	}
+	return nil
+}
+
+func writeFullBuffers(w io.Writer, parts ...[]byte) error {
+	total := 0
+	var scratch [4][]byte
+	buffers := net.Buffers(scratch[:0])
+	for _, part := range parts {
+		if len(part) == 0 {
+			continue
+		}
+		total += len(part)
+		buffers = append(buffers, part)
+	}
+	if total == 0 {
+		return nil
+	}
+	if _, ok := w.(net.Conn); !ok {
+		return writeFullParts(w, parts...)
+	}
+	written, err := buffers.WriteTo(w)
+	if err != nil {
+		return err
+	}
+	if written == int64(total) {
+		return nil
+	}
+	if written < 0 || written > int64(total) {
+		return io.ErrShortWrite
+	}
+	return writeBufRemainder(w, int(written), parts...)
+}
+
+func writeFullParts(w io.Writer, parts ...[]byte) error {
+	for _, part := range parts {
+		if len(part) == 0 {
+			continue
+		}
+		if err := writeFull(w, part); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func writeBufRemainder(w io.Writer, written int, parts ...[]byte) error {
+	for _, part := range parts {
+		if len(part) == 0 {
+			continue
+		}
+		if written >= len(part) {
+			written -= len(part)
+			continue
+		}
+		if written > 0 {
+			part = part[written:]
+			written = 0
+		}
+		if err := writeFull(w, part); err != nil {
+			return err
+		}
+	}
+	return nil
+}