upload android base code part3

android/art/compiler/linker/vector_output_stream.cc

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2013 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.
+ */
+
+#include "vector_output_stream.h"
+
+#include "base/logging.h"
+
+namespace art {
+
+VectorOutputStream::VectorOutputStream(const std::string& location, std::vector<uint8_t>* vector)
+    : OutputStream(location), offset_(vector->size()), vector_(vector) {}
+
+off_t VectorOutputStream::Seek(off_t offset, Whence whence) {
+  CHECK(whence == kSeekSet || whence == kSeekCurrent || whence == kSeekEnd) << whence;
+  off_t new_offset = 0;
+  switch (whence) {
+    case kSeekSet: {
+      new_offset = offset;
+      break;
+    }
+    case kSeekCurrent: {
+      new_offset = offset_ + offset;
+      break;
+    }
+    case kSeekEnd: {
+      new_offset = vector_->size() + offset;
+      break;
+    }
+  }
+  EnsureCapacity(new_offset);
+  offset_ = new_offset;
+  return offset_;
+}
+
+}  // namespace art