diff -r 000000000000 -r 6474c204b198 gfx/angle/src/compiler/preprocessor/Input.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/angle/src/compiler/preprocessor/Input.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,54 @@
+//
+// Copyright (c) 2011 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#include "Input.h"
+
+#include <algorithm>
+#include <cassert>
+#include <cstring>
+
+namespace pp
+{
+
+Input::Input() : mCount(0), mString(0)
+{
+}
+
+Input::Input(size_t count, const char* const string[], const int length[]) :
+    mCount(count),
+    mString(string)
+{
+    mLength.reserve(mCount);
+    for (size_t i = 0; i < mCount; ++i)
+    {
+        int len = length ? length[i] : -1;
+        mLength.push_back(len < 0 ? std::strlen(mString[i]) : len);
+    }
+}
+
+size_t Input::read(char* buf, size_t maxSize)
+{
+    size_t nRead = 0;
+    while ((nRead < maxSize) && (mReadLoc.sIndex < mCount))
+    {
+        size_t size = mLength[mReadLoc.sIndex] - mReadLoc.cIndex;
+        size = std::min(size, maxSize);
+        std::memcpy(buf + nRead, mString[mReadLoc.sIndex] + mReadLoc.cIndex, size);
+        nRead += size;
+        mReadLoc.cIndex += size;
+
+        // Advance string if we reached the end of current string.
+        if (mReadLoc.cIndex == mLength[mReadLoc.sIndex])
+        {
+            ++mReadLoc.sIndex;
+            mReadLoc.cIndex = 0;
+        }
+    }
+    return nRead;
+}
+
+}  // namespace pp
+