Fix binary handles reading in multiples of 8192

src/main/java/dan200/computercraft/core/apis/handles/BinaryReadableHandle.java

@@ -1,3 +1,9 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2018. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
 package dan200.computercraft.core.apis.handles;
 
 import com.google.common.collect.ObjectArrays;
@@ -80,26 +86,29 @@ public class BinaryReadableHandle extends HandleGeneric
                         }
                         else
                         {
+                            // Read the initial set of characters, failing if none are read.
                             ByteBuffer buffer = ByteBuffer.allocate( BUFFER_SIZE );
-
                             int read = m_reader.read( buffer );
                             if( read < 0 ) return null;
-                            int totalRead = read;
 
                             // If we failed to read "enough" here, let's just abort
-                            if( totalRead >= count || read < BUFFER_SIZE )
+                            if( read >= count || read < BUFFER_SIZE )
                             {
                                 return new Object[] { Arrays.copyOf( buffer.array(), read ) };
                             }
 
                             // Build up an array of ByteBuffers. Hopefully this means we can perform less allocation
                             // than doubling up the buffer each time.
+                            int totalRead = read;
                             List<ByteBuffer> parts = new ArrayList<>( 4 );
                             parts.add( buffer );
-                            while( totalRead < count && read >= BUFFER_SIZE )
+                            while( read >= BUFFER_SIZE && totalRead < count )
                             {
-                                buffer = ByteBuffer.allocate( BUFFER_SIZE );
+                                buffer = ByteBuffer.allocate( Math.min( BUFFER_SIZE, count - totalRead ) );
-                                totalRead += read = m_reader.read( buffer );
+                                read = m_reader.read( buffer );
+                                if( read < 0 ) break;
+
+                                totalRead += read;
                                 parts.add( buffer );
                             }
 

src/main/java/dan200/computercraft/core/apis/handles/BinaryWritableHandle.java

@@ -1,3 +1,9 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2018. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
 package dan200.computercraft.core.apis.handles;
 
 import com.google.common.collect.ObjectArrays;

src/main/java/dan200/computercraft/core/apis/handles/EncodedReadableHandle.java

@@ -1,3 +1,9 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2018. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
 package dan200.computercraft.core.apis.handles;
 
 import dan200.computercraft.api.lua.ILuaContext;
@@ -102,6 +108,7 @@ public class EncodedReadableHandle extends HandleGeneric
                 close();
                 return null;
             case 3:
+                // read
                 checkOpen();
                 try
                 {
@@ -127,19 +134,20 @@ public class EncodedReadableHandle extends HandleGeneric
 
                         // Read the initial set of characters, failing if none are read.
                         int read = m_reader.read( buffer, 0, Math.min( buffer.length, count ) );
-                        if( read == -1 ) return null;
+                        if( read < 0 ) return null;
 
                         StringBuilder out = new StringBuilder( read );
-                        count -= read;
+                        int totalRead = read;
                         out.append( buffer, 0, read );
 
                         // Otherwise read until we either reach the limit or we no longer consume
                         // the full buffer.
-                        while( read >= BUFFER_SIZE && count > 0 )
+                        while( read >= BUFFER_SIZE && totalRead < count )
                         {
-                            read = m_reader.read( buffer, 0, Math.min( BUFFER_SIZE, count ) );
+                            read = m_reader.read( buffer, 0, Math.min( BUFFER_SIZE, count - totalRead ) );
-                            if( read == -1 ) break;
+                            if( read < 0 ) break;
-                            count -= read;
+
+                            totalRead += read;
                             out.append( buffer, 0, read );
                         }
 

src/main/java/dan200/computercraft/core/apis/handles/EncodedWritableHandle.java

@@ -1,3 +1,9 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2018. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
 package dan200.computercraft.core.apis.handles;
 
 import dan200.computercraft.api.lua.ILuaContext;

src/main/java/dan200/computercraft/core/apis/handles/HandleGeneric.java

@@ -1,3 +1,9 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2018. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
 package dan200.computercraft.core.apis.handles;
 
 import dan200.computercraft.api.lua.ILuaObject;

src/test/java/dan200/computercraft/core/apis/ObjectWrapper.java

@@ -54,6 +54,17 @@ public class ObjectWrapper implements ILuaContext
         }
     }
 
+    @SuppressWarnings( "unchecked" )
+    public <T> T callOf( String name, Object... args ) throws LuaException
+    {
+        return (T) call( name, args )[0];
+    }
+
+    public <T> T callOf( Class<T> klass, String name, Object... args ) throws LuaException
+    {
+        return klass.cast( call( name, args )[0] );
+    }
+
     @Nonnull
     @Override
     public Object[] pullEvent( @Nullable String filter )

src/test/java/dan200/computercraft/core/apis/handles/BinaryReadableHandleTest.java

@@ -0,0 +1,68 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2018. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.core.apis.handles;
+
+import dan200.computercraft.api.lua.LuaException;
+import dan200.computercraft.core.apis.ObjectWrapper;
+import org.junit.Test;
+
+import java.util.Arrays;
+
+import static org.junit.Assert.assertEquals;
+
+public class BinaryReadableHandleTest
+{
+    @Test
+    public void testReadChar() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 5 );
+        assertEquals( 'A', (int) wrapper.callOf( Integer.class, "read" ) );
+    }
+
+    @Test
+    public void testReadShortComplete() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 10 );
+        assertEquals( 5, wrapper.<byte[]>callOf( "read", 5 ).length );
+    }
+
+    @Test
+    public void testReadShortPartial() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 5 );
+        assertEquals( 5, wrapper.<byte[]>callOf( "read", 10 ).length );
+    }
+
+
+    @Test
+    public void testReadLongComplete() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 10000 );
+        assertEquals( 9000, wrapper.<byte[]>callOf( "read", 9000 ).length );
+    }
+
+    @Test
+    public void testReadLongPartial() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 10000 );
+        assertEquals( 10000, wrapper.<byte[]>callOf( "read", 11000 ).length );
+    }
+
+    @Test
+    public void testReadLongPartialSmaller() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 1000 );
+        assertEquals( 1000, wrapper.<byte[]>callOf( "read", 11000 ).length );
+    }
+
+    private static ObjectWrapper fromLength( int length )
+    {
+        byte[] input = new byte[length];
+        Arrays.fill( input, (byte) 'A' );
+        return new ObjectWrapper( new BinaryReadableHandle( new ArrayByteChannel( input ) ) );
+    }
+}

src/test/java/dan200/computercraft/core/apis/handles/EncodedReadableHandleTest.java

@@ -0,0 +1,70 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2018. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+
+package dan200.computercraft.core.apis.handles;
+
+import dan200.computercraft.api.lua.LuaException;
+import dan200.computercraft.core.apis.ObjectWrapper;
+import org.junit.Test;
+
+import java.io.BufferedReader;
+import java.io.CharArrayReader;
+import java.util.Arrays;
+
+import static org.junit.Assert.assertEquals;
+
+public class EncodedReadableHandleTest
+{
+    @Test
+    public void testReadChar() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 5 );
+        assertEquals( "A", wrapper.callOf( "read" ) );
+    }
+
+    @Test
+    public void testReadShortComplete() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 10 );
+        assertEquals( "AAAAA", wrapper.callOf( "read", 5 ) );
+    }
+
+    @Test
+    public void testReadShortPartial() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 5 );
+        assertEquals( "AAAAA", wrapper.callOf( "read", 10 ) );
+    }
+
+
+    @Test
+    public void testReadLongComplete() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 10000 );
+        assertEquals( 9000, wrapper.<String>callOf( "read", 9000 ).length() );
+    }
+
+    @Test
+    public void testReadLongPartial() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 10000 );
+        assertEquals( 10000, wrapper.<String>callOf( "read", 11000 ).length() );
+    }
+
+    @Test
+    public void testReadLongPartialSmaller() throws LuaException
+    {
+        ObjectWrapper wrapper = fromLength( 1000 );
+        assertEquals( 1000, wrapper.<String>callOf( "read", 11000 ).length() );
+    }
+
+    private static ObjectWrapper fromLength( int length )
+    {
+        char[] input = new char[length];
+        Arrays.fill( input, 'A' );
+        return new ObjectWrapper( new EncodedReadableHandle( new BufferedReader( new CharArrayReader( input ) ) ) );
+    }
+}