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-rwxr-xr-xgfx/angle/src/common/MemoryBuffer.cpp80
1 files changed, 80 insertions, 0 deletions
diff --git a/gfx/angle/src/common/MemoryBuffer.cpp b/gfx/angle/src/common/MemoryBuffer.cpp
new file mode 100755
index 000000000..e7a3fb4a2
--- /dev/null
+++ b/gfx/angle/src/common/MemoryBuffer.cpp
@@ -0,0 +1,80 @@
+//
+// Copyright (c) 2014 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 "common/MemoryBuffer.h"
+
+#include <algorithm>
+#include <cstdlib>
+
+#include "common/debug.h"
+
+namespace rx
+{
+
+MemoryBuffer::MemoryBuffer()
+ : mSize(0),
+ mData(NULL)
+{
+}
+
+MemoryBuffer::~MemoryBuffer()
+{
+ free(mData);
+ mData = NULL;
+}
+
+bool MemoryBuffer::resize(size_t size)
+{
+ if (size == 0)
+ {
+ free(mData);
+ mData = NULL;
+ mSize = 0;
+ return true;
+ }
+
+ if (size == mSize)
+ {
+ return true;
+ }
+
+ // Only reallocate if the size has changed.
+ uint8_t *newMemory = reinterpret_cast<uint8_t*>(malloc(sizeof(uint8_t) * size));
+ if (newMemory == NULL)
+ {
+ return false;
+ }
+
+ if (mData)
+ {
+ // Copy the intersection of the old data and the new data
+ std::copy(mData, mData + std::min(mSize, size), newMemory);
+ free(mData);
+ }
+
+ mData = newMemory;
+ mSize = size;
+
+ return true;
+}
+
+size_t MemoryBuffer::size() const
+{
+ return mSize;
+}
+
+const uint8_t *MemoryBuffer::data() const
+{
+ return mData;
+}
+
+uint8_t *MemoryBuffer::data()
+{
+ ASSERT(mData);
+ return mData;
+}
+
+}