Updated

mirai-core/src/main/java/net/mamoe/mirai/MiraiServer.java

@@ -28,7 +28,7 @@ import java.util.concurrent.ExecutionException;
  *
  * @author NaturalHG
  */
-public class MiraiServer {
+public final class MiraiServer {
     private static MiraiServer instance;
 
     public static MiraiServer getInstance() {

mirai-core/src/main/java/net/mamoe/mirai/message/defaults/Image.kt

@@ -2,6 +2,8 @@ package net.mamoe.mirai.message.defaults
 
 import net.mamoe.mirai.message.Message
 import net.mamoe.mirai.message.MessageId
+import net.mamoe.mirai.network.packet.cutTail
+import net.mamoe.mirai.network.packet.md5
 import java.awt.image.BufferedImage
 import java.io.*
 import java.net.URL
@@ -54,4 +56,12 @@ class Image : Message {
         }
         return this.imageID == another.imageID
     }
+
+    companion object {
+        fun getImageID(filename: String): ByteArray = md5(filename).cutTail(1)
+    }
+}
+
+fun main() {
+    println(0xB0)
 }
\ No newline at end of file

mirai-core/src/main/java/net/mamoe/mirai/network/packet/ClientPacket.kt

@@ -244,4 +244,14 @@ fun DataOutputStream.writeVarByteArray(byteArray: ByteArray) {
 
 fun DataOutputStream.writeVarString(str: String) {
     this.writeVarByteArray(str.toByteArray())
+}
+
+fun DataOutputStream.writeVarShort(short: Int) {
+    this.writeByte(0x02)
+    this.writeShort(short)
+}
+
+fun DataOutputStream.writeVarInt(int: Int) {
+    this.writeByte(0x04)
+    this.writeInt(int)
 }
\ No newline at end of file

mirai-core/src/main/java/net/mamoe/mirai/network/packet/image/ClientGetGroupImageIDPacket.kt

+package net.mamoe.mirai.network.packet.image
+
+import net.mamoe.mirai.network.packet.*
+import net.mamoe.mirai.utils.writeProtoInt
+import java.awt.image.BufferedImage
+
+/**
+ * 查询群消息的 image id.
+ * That is, 查询服务器上是否有这个图片, 有就返回 id, 没有就需要上传
+ *
+ * @author Him188moe
+ */
+@PacketId("03 88")
+@ExperimentalUnsignedTypes
+class ClientGetGroupImageIDPacket(
+        val bot: Long,
+        val sessionKey: ByteArray,
+        val group: Long,
+        val image: BufferedImage
+) : ClientPacket() {
+    override fun encode() {
+        this.writeRandom(2)
+
+        this.writeQQ(bot)
+        this.writeHex("04 00 00 00 01 01 01 00 00 68 20 00 00 00 00 00 00 00 00")
+        this.encryptAndWrite(sessionKey) {
+            it.writeHex("00 00 00 07 00 00 00 5E 08 01 12 03 98 01 01 10 01 1A")
+            it.writeHex("5A")
+            it.writeHex("08")
+            it.writeProtoInt(group)
+            it.writeHex("08")
+            it.writeProtoInt(image.height)
+        }
+    }
+}
\ No newline at end of file

mirai-core/src/main/java/net/mamoe/mirai/utils/CharImageConverter.java

@@ -8,9 +8,10 @@ import java.util.concurrent.Callable;
 
 /**
  * Convert IMAGE into Chars that could shows in terminal
+ *
  * @author NaturalHG
  */
-public class CharImageConverter implements Callable<String> {
+public final class CharImageConverter implements Callable<String> {
 
     /**
      * width should depends on the width of the terminal
@@ -19,74 +20,73 @@ public class CharImageConverter implements Callable<String> {
     private int width;
     private double ignoreRate;
 
-    public CharImageConverter(BufferedImage image, int width){
-        this(image,width,0.95);
+    public CharImageConverter(BufferedImage image, int width) {
+        this(image, width, 0.95);
     }
 
-    public CharImageConverter(BufferedImage image, int width, double ignoreRate){
+    public CharImageConverter(BufferedImage image, int width, double ignoreRate) {
         this.image = image;
         this.width = width;
         this.ignoreRate = ignoreRate;
     }
 
     @Override
-    public String call(){
-       /*
-       * resize Image
-       * */
-        int newHeight = (int)(this.image.getHeight() * (((double)width) /this.image.getWidth()));
+    public String call() {
+        /*
+         * resize Image
+         * */
+        int newHeight = (int) (this.image.getHeight() * (((double) width) / this.image.getWidth()));
         Image tmp = image.getScaledInstance(width, newHeight, Image.SCALE_SMOOTH);
         BufferedImage dimg = new BufferedImage(width, newHeight, BufferedImage.TYPE_INT_ARGB);
         Graphics2D g2d = dimg.createGraphics();
         g2d.drawImage(tmp, 0, 0, null);
         this.image = dimg;
 
-       int background = this.gray(image.getRGB(0,0));
+        int background = gray(image.getRGB(0, 0));
 
-       StringBuilder builder = new StringBuilder();
+        StringBuilder builder = new StringBuilder();
 
-       List<StringBuilder> lines = new ArrayList<>(this.image.getHeight());
+        List<StringBuilder> lines = new ArrayList<>(this.image.getHeight());
 
-       int minXPos = this.width;
-       int maxXPos = 0;
+        int minXPos = this.width;
+        int maxXPos = 0;
 
-       for (int y = 0; y < image.getHeight(); y++) {
-           StringBuilder builderLine = new StringBuilder();
-           for (int x = 0; x < image.getWidth(); x++) {
-               int gray = this.gray(image.getRGB(x, y));
-               if (grayCompare(gray, background)) {
-                   builderLine.append(" ");
-               } else {
-                   builderLine.append("#");
-                   if (x < minXPos) {
-                       minXPos = x;
-                   }
-                   if (x > maxXPos) {
-                       maxXPos = x;
-                   }
-               }
-           }
-           if (builderLine.toString().isBlank()) {
-               continue;
-           }
-           lines.add(builderLine);
-       }
-        for (int i=0;i<lines.size();++i) {
-            builder.append(lines.get(i).substring(minXPos, maxXPos)).append("\n");
+        for (int y = 0; y < image.getHeight(); y++) {
+            StringBuilder builderLine = new StringBuilder();
+            for (int x = 0; x < image.getWidth(); x++) {
+                int gray = gray(image.getRGB(x, y));
+                if (grayCompare(gray, background)) {
+                    builderLine.append(" ");
+                } else {
+                    builderLine.append("#");
+                    if (x < minXPos) {
+                        minXPos = x;
+                    }
+                    if (x > maxXPos) {
+                        maxXPos = x;
+                    }
+                }
+            }
+            if (builderLine.toString().isBlank()) {
+                continue;
+            }
+            lines.add(builderLine);
         }
-       return builder.toString();
+        for (StringBuilder line : lines) {
+            builder.append(line.substring(minXPos, maxXPos)).append("\n");
+        }
+        return builder.toString();
     }
 
-    private int gray(int rgb) {
+    private static int gray(int rgb) {
         int R = (rgb & 0xff0000) >> 16;
         int G = (rgb & 0x00ff00) >> 8;
         int B = rgb & 0x0000ff;
-        int gray = (R * 30 + G * 59 + B * 11 + 50) / 100;
         return (R * 30 + G * 59 + B * 11 + 50) / 100;
     }
 
-    public boolean grayCompare(int g1, int g2){
-        return ((double)Math.min(g1,g2)/Math.max(g1,g2)) >= ignoreRate;
+    public boolean grayCompare(int g1, int g2) {
+        return ((double) Math.min(g1, g2) / Math.max(g1, g2)) >= ignoreRate;
     }
 
 }

mirai-core/src/main/java/net/mamoe/mirai/utils/ProtocolBuff.kt

@@ -15,13 +15,13 @@ import java.io.DataOutputStream
  * TODO improve
  */
 @ExperimentalUnsignedTypes
-fun DataOutputStream.writeProtoFixedInt(int: Int) {
-    if (int == 128) {
+fun DataOutputStream.writeProtoFixedInt(int: Long) {
+    if (int == 0xFFL) {
         this.writeShort(0x80_01)//unsigned//1000000010000001
         return
     }
-    this.writeByte(int.rem(128) + 128)
-    this.writeByte(int / 128)
+    this.writeByte((int.rem(0xFF) + 0xFF).toInt())
+    this.writeByte((int / 0xFF).toInt())
 }
 
 /**
@@ -30,9 +30,9 @@ fun DataOutputStream.writeProtoFixedInt(int: Int) {
  * TODO improve
  */
 @ExperimentalUnsignedTypes
-fun DataOutputStream.writeProtoInt(int: Int) {
-    if (int < 128) {
-        this.writeByte(int and 0xFF)//10000000
+fun DataOutputStream.writeProtoInt(int: Long) {
+    if (int < 0xFF) {
+        this.writeByte((int and 0xFF).toInt())//10000000
         return
     }
     this.writeProtoFixedInt(int)