AAPT2: Fix windows unicode path issues

Mingw64 was being difficult, so instead of defining a wmain entrypoint,
the command line parameters are parsed manually using built-in Windows
methods that support Unicode. The results are converted to UTF8 and
handled just like the rest of the linux/mac version of the code.

This also removes dependencies on std::istream in favour of a
FileInputStream which calls the appropriate unicode version of
open to read a file.

No speed regressions found on Linux or MacOS.

Bug: 62336414
Bug: 63830502
Test: manual
Change-Id: I597da51e33729ed1b98bf246e7e773337fd3fee8

1 files changed, 50 insertions, 0 deletions

diff --git a/tools/aapt2/io/StringInputStream.cpp b/tools/aapt2/io/StringInputStream.cpp
new file mode 100644
index 000000000000..51a18a7d8a9f
--- /dev/null
+++ b/tools/aapt2/io/StringInputStream.cpp
@@ -0,0 +1,50 @@
+/*
+ * 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/StringInputStream.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_) {
+    count = offset_;
+  }
+  offset_ -= count;
+}
+
+size_t StringInputStream::ByteCount() const {
+  return offset_;
+}
+
+}  // namespace io
+}  // namespace aapt