Changes to support smaller email tombstone apk size

This reduces the tombstone down by 100K

A follow-on cl will remove the unused resources from the tombstone build

Bug: 17414014
Change-Id: I5d38811b17a5273ec726e750ab123e10e36cee04

1 files changed, 123 insertions, 0 deletions

diff --git a/provider_src/com/android/email/mail/store/imap/ImapTempFileLiteral.java b/provider_src/com/android/email/mail/store/imap/ImapTempFileLiteral.java
new file mode 100644
index 000000000..4feccc760
--- /dev/null
+++ b/provider_src/com/android/email/mail/store/imap/ImapTempFileLiteral.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.email.mail.store.imap;
+
+import com.android.email.FixedLengthInputStream;
+import com.android.emailcommon.Logging;
+import com.android.emailcommon.TempDirectory;
+import com.android.emailcommon.utility.Utility;
+import com.android.mail.utils.LogUtils;
+
+import org.apache.commons.io.IOUtils;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/**
+ * Subclass of {@link ImapString} used for literals backed by a temp file.
+ */
+public class ImapTempFileLiteral extends ImapString {
+    /* package for test */ final File mFile;
+
+    /** Size is purely for toString() */
+    private final int mSize;
+
+    /* package */  ImapTempFileLiteral(FixedLengthInputStream stream) throws IOException {
+        mSize = stream.getLength();
+        mFile = File.createTempFile("imap", ".tmp", TempDirectory.getTempDirectory());
+
+        // Unfortunately, we can't really use deleteOnExit(), because temp filenames are random
+        // so it'd simply cause a memory leak.
+        // deleteOnExit() simply adds filenames to a static list and the list will never shrink.
+        // mFile.deleteOnExit();
+        OutputStream out = new FileOutputStream(mFile);
+        IOUtils.copy(stream, out);
+        out.close();
+    }
+
+    /**
+     * Make sure we delete the temp file.
+     *
+     * We should always be calling {@link ImapResponse#destroy()}, but it's here as a last resort.
+     */
+    @Override
+    protected void finalize() throws Throwable {
+        try {
+            destroy();
+        } finally {
+            super.finalize();
+        }
+    }
+
+    @Override
+    public InputStream getAsStream() {
+        checkNotDestroyed();
+        try {
+            return new FileInputStream(mFile);
+        } catch (FileNotFoundException e) {
+            // It's probably possible if we're low on storage and the system clears the cache dir.
+            LogUtils.w(Logging.LOG_TAG, "ImapTempFileLiteral: Temp file not found");
+
+            // Return 0 byte stream as a dummy...
+            return new ByteArrayInputStream(new byte[0]);
+        }
+    }
+
+    @Override
+    public String getString() {
+        checkNotDestroyed();
+        try {
+            byte[] bytes = IOUtils.toByteArray(getAsStream());
+            // Prevent crash from OOM; we've seen this, but only rarely and not reproducibly
+            if (bytes.length > ImapResponseParser.LITERAL_KEEP_IN_MEMORY_THRESHOLD) {
+                throw new IOException();
+            }
+            return Utility.fromAscii(bytes);
+        } catch (IOException e) {
+            LogUtils.w(Logging.LOG_TAG, "ImapTempFileLiteral: Error while reading temp file", e);
+            return "";
+        }
+    }
+
+    @Override
+    public void destroy() {
+        try {
+            if (!isDestroyed() && mFile.exists()) {
+                mFile.delete();
+            }
+        } catch (RuntimeException re) {
+            // Just log and ignore.
+            LogUtils.w(Logging.LOG_TAG, "Failed to remove temp file: " + re.getMessage());
+        }
+        super.destroy();
+    }
+
+    @Override
+    public String toString() {
+        return String.format("{%d byte literal(file)}", mSize);
+    }
+
+    public boolean tempFileExistsForTest() {
+        return mFile.exists();
+    }
+}