added okio buffer for write thread

usbserial/build.gradle

@@ -36,6 +36,7 @@ android {
 
     dependencies {
         implementation 'com.annimon:stream:1.2.1'
+        implementation 'com.squareup.okio:okio:2.1.0'
     }
 
     createJar.dependsOn(deleteJar, build)

usbserial/src/main/java/com/felhr/usbserial/SerialBuffer.java

@@ -1,19 +1,19 @@
 package com.felhr.usbserial;
 
-import java.nio.BufferOverflowException;
 import java.nio.ByteBuffer;
 import java.util.Arrays;
 
+import okio.Buffer;
+
 public class SerialBuffer
 {
-    public static final int DEFAULT_READ_BUFFER_SIZE = 16 * 1024;
+    static final int DEFAULT_READ_BUFFER_SIZE = 16 * 1024;
-    public static final int DEFAULT_WRITE_BUFFER_SIZE = 16 * 1024;
     private ByteBuffer readBuffer;
     private SynchronizedBuffer writeBuffer;
-    private byte[] readBuffer_compatible; // Read buffer for android < 4.2
+    private byte[] readBufferCompatible; // Read buffer for android < 4.2
     private boolean debugging = false;
 
-    public SerialBuffer(boolean version)
+    SerialBuffer(boolean version)
     {
         writeBuffer = new SynchronizedBuffer();
         if(version)
@@ -22,7 +22,7 @@ public class SerialBuffer
 
         }else
         {
-            readBuffer_compatible = new byte[DEFAULT_READ_BUFFER_SIZE];
+            readBufferCompatible = new byte[DEFAULT_READ_BUFFER_SIZE];
         }
     }
 
@@ -34,21 +34,7 @@ public class SerialBuffer
         debugging = value;
     }
 
-    public void putReadBuffer(ByteBuffer data)
+    ByteBuffer getReadBuffer()
-    {
-        synchronized(this)
-        {
-            try
-            {
-                readBuffer.put(data);
-            }catch(BufferOverflowException e)
-            {
-                // TO-DO
-            }
-        }
-    }
-
-    public ByteBuffer getReadBuffer()
     {
         synchronized(this)
         {
@@ -57,7 +43,7 @@ public class SerialBuffer
     }
 
 
-    public byte[] getDataReceived()
+    byte[] getDataReceived()
     {
         synchronized(this)
         {
@@ -70,7 +56,7 @@ public class SerialBuffer
         }
     }
 
-    public void clearReadBuffer()
+    void clearReadBuffer()
     {
         synchronized(this)
         {
@@ -78,68 +64,50 @@ public class SerialBuffer
         }
     }
 
-    public byte[] getWriteBuffer()
+    byte[] getWriteBuffer()
     {
         return writeBuffer.get();
     }
 
-    public void putWriteBuffer(byte[]data)
+    void putWriteBuffer(byte[]data)
     {
         writeBuffer.put(data);
     }
 
 
-    public void resetWriteBuffer()
+    byte[] getBufferCompatible()
     {
-        writeBuffer.reset();
+        return readBufferCompatible;
     }
 
-    public byte[] getBufferCompatible()
+    byte[] getDataReceivedCompatible(int numberBytes)
     {
-        return readBuffer_compatible;
+        return Arrays.copyOfRange(readBufferCompatible, 0, numberBytes);
-    }
-
-    public byte[] getDataReceivedCompatible(int numberBytes)
-    {
-        byte[] tempBuff = Arrays.copyOfRange(readBuffer_compatible, 0, numberBytes);
-        return tempBuff;
     }
 
     private class SynchronizedBuffer
     {
-        private byte[] buffer;
+        private Buffer buffer;
-        private int position;
 
-        public SynchronizedBuffer()
+        SynchronizedBuffer()
         {
-            this.buffer = new byte[DEFAULT_WRITE_BUFFER_SIZE];
+            this.buffer = new Buffer();
-            position = -1;
         }
 
-        public synchronized void put(byte[] src)
+        synchronized void put(byte[] src)
         {
             if(src == null || src.length == 0) return;
-            if(position == -1)
+
-                position = 0;
             if(debugging)
                 UsbSerialDebugger.printLogPut(src, true);
-            if(position + src.length > DEFAULT_WRITE_BUFFER_SIZE - 1) //Checking bounds. Source data does not fit in buffer
+
-            {
+            buffer.write(src);
-                if(position < DEFAULT_WRITE_BUFFER_SIZE)
-                    System.arraycopy(src, 0, buffer, position, DEFAULT_WRITE_BUFFER_SIZE - position);
-                position = DEFAULT_WRITE_BUFFER_SIZE;
             notify();
-            }else // Source data fits in buffer
-            {
-                System.arraycopy(src, 0, buffer, position, src.length);
-                position += src.length;
-                notify();
-            }
         }
 
-        public synchronized byte[] get()
+        synchronized byte[] get()
         {
-            if(position == -1)
+            if(buffer.size() > 0)
             {
                 try
                 {
@@ -149,17 +117,13 @@ public class SerialBuffer
                     e.printStackTrace();
                 }
             }
-            if(position <= -1 ) return new byte[0];
+
-            byte[] dst =  Arrays.copyOfRange(buffer, 0, position);
+            byte[] dst = buffer.readByteArray();
+
             if(debugging)
                 UsbSerialDebugger.printLogGet(dst, true);
-            position = -1;
-            return dst;
-        }
 
-        public synchronized void reset()
+            return dst;
-        {
-            position = -1;
         }
     }
 

usbserial/src/main/java/com/felhr/usbserial/UsbSerialDevice.java

@@ -544,7 +544,6 @@ public abstract class UsbSerialDevice implements UsbSerialInterface
         {
             writeThread.stopWriteThread();
             writeThread = null;
-            serialBuffer.resetWriteBuffer();
         }
     }
 

usbserial/src/main/java/com/felhr/usbserial/UsbSpiDevice.java

@@ -208,7 +208,6 @@ public abstract class UsbSpiDevice implements UsbSpiInterface
         {
             writeThread.stopWriteThread();
             writeThread = null;
-            serialBuffer.resetWriteBuffer();
         }
     }