Implement bulk read and writes for Bluetooth sockets.

Before: 0.1 kB/s
After: 100 kB/s
(in my java BT speed test app)

1 files changed, 39 insertions, 3 deletions

diff --git a/core/java/android/bluetooth/BluetoothInputStream.java b/core/java/android/bluetooth/BluetoothInputStream.java
index ceae70c586d3..e6f501c9b69f 100644
--- a/core/java/android/bluetooth/BluetoothInputStream.java
+++ b/core/java/android/bluetooth/BluetoothInputStream.java
@@ -24,7 +24,6 @@ import java.io.InputStream;
  *
  * Used to write to a Bluetooth socket.
  *
- * TODO: Implement bulk writes (instead of one byte at a time).
  * @hide
  */
 /*package*/ final class BluetoothInputStream extends InputStream {
@@ -54,9 +53,46 @@ import java.io.InputStream;
      * @return the byte read or -1 if the end of stream has been reached.
      * @throws IOException
      *             if the stream is closed or another IOException occurs.
-     * @since Android 1.0
+     * @since Android 1.5
      */
     public int read() throws IOException {
-        return mSocket.readNative();
+        byte b[] = new byte[1];
+        int ret = mSocket.readNative(b, 0, 1);
+        if (ret == 1) {
+            return (int)b[0];
+        } else {
+            return -1;
+        }
+    }
+
+    /**
+     * Reads at most {@code length} bytes from this stream and stores them in
+     * the byte array {@code b} starting at {@code offset}.
+     *
+     * @param b
+     *            the byte array in which to store the bytes read.
+     * @param offset
+     *            the initial position in {@code buffer} to store the bytes
+     *            read from this stream.
+     * @param length
+     *            the maximum number of bytes to store in {@code b}.
+     * @return the number of bytes actually read or -1 if the end of the stream
+     *         has been reached.
+     * @throws IndexOutOfBoundsException
+     *             if {@code offset < 0} or {@code length < 0}, or if
+     *             {@code offset + length} is greater than the length of
+     *             {@code b}.
+     * @throws IOException
+     *             if the stream is closed or another IOException occurs.
+     * @since Android 1.5
+     */
+    public int read(byte[] b, int offset, int length) throws IOException {
+        if (b == null) {
+            throw new NullPointerException("byte array is null");
+        }
+        if ((offset | length) < 0 || length > b.length - offset) {
+            throw new ArrayIndexOutOfBoundsException("invalid offset or length");
+        }
+        return mSocket.readNative(b, offset, length);
     }
 }