Change AdbFilterInputStream.read not to wait for more data

The previous AdbFilterInputStream.read function was always waiting for
buffer to fill, even if this meant to block for a long time. Now it checks
if the next read will block. The one case it still could block, when
reading a 0xd (carriage return) is not expected to occur for interactive
output (at least as the last character of some input).
This removes the need for a separate executeShellRaw method.

src/se/vidstige/jadb/AdbFilterInputStream.java

@@ -31,6 +31,11 @@ public int read(byte[] buffer, int offset, int length) throws IOException {
             if (b == -1) return n == 0 ? -1 : n;
             buffer[offset + n] = (byte) b;
             n++;
+
+            // Return as soon as no more data is available (and at least one byte was read)
+            if (in.available() <= 0) {
+                return n;
+            }
         }
         return n;
     }

src/se/vidstige/jadb/JadbDevice.java

@@ -71,41 +71,23 @@ public State getState() throws IOException, JadbException {
         return state;
     }
 
-    /** Execute a shell command with raw output.
-     *
-     * This function differs from executeShell in that no buffering and newline filtering is performed.
-     *
-     * Especially the buffering may be an issue if the output of an ongoing command should be displayed,
-     * e.g. the output of running logcat.
+    /** Execute a shell command.
      *
-     * @param command main command.
-     * @param args arguments to the commands
+     * @param command main command to run. E.g. "ls"
+     * @param args arguments to the command.
      * @return combined stdout/stderr stream.
      * @throws IOException
      * @throws JadbException
      */
-    public InputStream executeShellRaw(String command, String... args) throws IOException, JadbException {
+    public InputStream executeShell(String command, String... args) throws IOException, JadbException {
         Transport transport = getTransport();
         StringBuilder shellLine = new StringBuilder(command);
         for (String arg : args) {
             shellLine.append(" ");
             shellLine.append(Bash.quote(arg));
         }
         send(transport, "shell:" + shellLine.toString());
-        return transport.getInputStream();
-    }
-
-    /** Execute a shell command.
-     *
-     * @param command main command.
-     * @param args arguments to the commands
-     * @return combined stdout/stderr stream.
-     * @throws IOException
-     * @throws JadbException
-     */
-    public InputStream executeShell(String command, String... args) throws IOException, JadbException {
-        InputStream inputStream = executeShellRaw(command, args);
-    	return new AdbFilterInputStream(new BufferedInputStream(inputStream));
+        return new AdbFilterInputStream(new BufferedInputStream(transport.getInputStream()));
     }
 
     /**