1 files changed, 100 insertions, 0 deletions
diff --git a/tools/aapt2/io/StringStream.cpp b/tools/aapt2/io/StringStream.cpp
new file mode 100644
index 000000000000..4ca04a8c7477
--- /dev/null
+++ b/tools/aapt2/io/StringStream.cpp
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2017 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 "io/StringStream.h"
+
+using ::android::StringPiece;
+
+namespace aapt {
+namespace io {
+
+StringInputStream::StringInputStream(const StringPiece& str) : str_(str), offset_(0u) {
+}
+
+bool StringInputStream::Next(const void** data, size_t* size) {
+  if (offset_ == str_.size()) {
+    return false;
+  }
+
+  *data = str_.data() + offset_;
+  *size = str_.size() - offset_;
+  offset_ = str_.size();
+  return true;
+}
+
+void StringInputStream::BackUp(size_t count) {
+  if (count > offset_) {
+    offset_ = 0u;
+  } else {
+    offset_ -= count;
+  }
+}
+
+size_t StringInputStream::ByteCount() const {
+  return offset_;
+}
+
+size_t StringInputStream::TotalSize() const {
+  return str_.size();
+}
+
+StringOutputStream::StringOutputStream(std::string* str, size_t buffer_capacity)
+    : str_(str),
+      buffer_capacity_(buffer_capacity),
+      buffer_offset_(0u),
+      buffer_(new char[buffer_capacity]) {
+}
+
+StringOutputStream::~StringOutputStream() {
+  Flush();
+}
+
+bool StringOutputStream::Next(void** data, size_t* size) {
+  if (buffer_offset_ == buffer_capacity_) {
+    FlushImpl();
+  }
+
+  *data = buffer_.get() + buffer_offset_;
+  *size = buffer_capacity_ - buffer_offset_;
+  buffer_offset_ = buffer_capacity_;
+  return true;
+}
+
+void StringOutputStream::BackUp(size_t count) {
+  if (count > buffer_offset_) {
+    buffer_offset_ = 0u;
+  } else {
+    buffer_offset_ -= count;
+  }
+}
+
+size_t StringOutputStream::ByteCount() const {
+  return str_->size() + buffer_offset_;
+}
+
+void StringOutputStream::Flush() {
+  if (buffer_offset_ != 0u) {
+    FlushImpl();
+  }
+}
+
+void StringOutputStream::FlushImpl() {
+  str_->append(buffer_.get(), buffer_offset_);
+  buffer_offset_ = 0u;
+}
+
+}  // namespace io
+}  // namespace aapt