Add support for loading parts with DataLocation.ON_DISK

k9mail/src/main/java/com/fsck/k9/mailstore/FileBackedBody.java

@@ -0,0 +1,60 @@
+package com.fsck.k9.mailstore;
+
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import com.fsck.k9.mail.Body;
+import com.fsck.k9.mail.MessagingException;
+import com.fsck.k9.mail.internet.RawDataBody;
+import com.fsck.k9.mail.internet.SizeAware;
+import org.apache.commons.io.IOUtils;
+
+
+public class FileBackedBody implements Body, SizeAware, RawDataBody {
+    private final File file;
+    private final String encoding;
+
+    public FileBackedBody(File file, String encoding) {
+        this.file = file;
+        this.encoding = encoding;
+    }
+
+    @Override
+    public InputStream getInputStream() throws MessagingException {
+        try {
+            return new FileInputStream(file);
+        } catch (FileNotFoundException e) {
+            throw new MessagingException("File not found", e);
+        }
+    }
+
+    @Override
+    public void setEncoding(String encoding) throws MessagingException {
+        throw new RuntimeException("not supported");
+    }
+
+    @Override
+    public void writeTo(OutputStream out) throws IOException, MessagingException {
+        InputStream in = getInputStream();
+        try {
+            IOUtils.copy(in, out);
+        } finally {
+            in.close();
+        }
+    }
+
+    @Override
+    public long getSize() {
+        return file.length();
+    }
+
+    @Override
+    public String getEncoding() {
+        return encoding;
+    }
+}

k9mail/src/main/java/com/fsck/k9/mailstore/LocalFolder.java

@@ -725,12 +725,18 @@ public class LocalFolder extends Folder<LocalMessage> implements Serializable {
             part.setBody(multipart);
             multipart.setPreamble(preamble);
             multipart.setEpilogue(epilogue);
-        } else if (dataLocation != DataLocation.MISSING) {
+        } else if (dataLocation == DataLocation.IN_DATABASE) {
             String encoding = cursor.getString(7);
             byte[] data = cursor.getBlob(10);
 
             Body body = new BinaryMemoryBody(data, encoding);
             part.setBody(body);
+        } else if (dataLocation == DataLocation.ON_DISK) {
+            String encoding = cursor.getString(7);
+
+            File file = localStore.getAttachmentFile(Long.toString(id));
+            Body body = new FileBackedBody(file, encoding);
+            part.setBody(body);
         }
     }