Initial commit of font compression code into public project.

src/com/google/typography/font/compression/Command.java

@@ -0,0 +1,72 @@
+// Copyright 2011 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package com.google.typography.font.compression;
+
+import com.google.common.io.ByteStreams;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/**
+ * This is a simple wrapper to run a commandline as a pipe. It's not
+ * particularly efficient, robust, or featureful.
+ */
+public class Command {
+
+  private class StreamConsumer extends Thread {
+    private final InputStream is;
+    private byte[] result = null;
+
+    public StreamConsumer(InputStream is) {
+      this.is = is;
+    }
+
+    @Override
+    public void run() {
+      try {
+        result = ByteStreams.toByteArray(is);
+      } catch (IOException e) {
+        // TODO: handle this well
+      }
+    }
+
+    public byte[] getResult() {
+      return result;
+    }
+  }
+
+  private final ProcessBuilder processBuilder;
+
+  public Command(String[] args) {
+    processBuilder = new ProcessBuilder(args);
+  }
+
+  public CommandResult execute(byte[] input) throws CommandException {
+    Process process;
+    try {
+      process = processBuilder.start();
+    } catch (IOException e) {
+      throw new CommandException("exec failed");
+    }
+    StreamConsumer sc = new StreamConsumer(process.getInputStream());
+    sc.start();
+    OutputStream stdin = process.getOutputStream();
+    try {
+      stdin.write(input);
+      stdin.close();
+    } catch (IOException e) {
+      throw new CommandException("error writing input");
+    }
+    try {
+      process.waitFor();
+      sc.join();
+    } catch (InterruptedException e) {
+      throw new CommandException("interrupted");
+    }
+    return new CommandResult(sc.getResult());
+  }
+}
+