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authorLei Zhang <thestig@chromium.org>2015-10-09 13:51:05 -0700
committerLei Zhang <thestig@chromium.org>2015-10-09 13:51:05 -0700
commit3acb1ef909a22368507ed13817c4988c818e3aee (patch)
treec5fcef7a3f30562c2bfc6118c818eb120211687c /third_party/base/stl_util.h
parentfd751f28cecce61ab36038799043639d570e0b26 (diff)
downloadpdfium-3acb1ef909a22368507ed13817c4988c818e3aee.tar.xz
Sanitize CJBig2_SymbolDict's memory usage.chromium/2534chromium/2533chromium/2532
- Use std::vector<JBig2ArithCtx> instead of storing pointers to arrays. - Make CJBig2_SymbolDict's members private with accessors. - Use std::vector<JBig2ArithCtx> in related places. - Steal Chromium's vector_as_array() and use it as an adaptor as needed. BUG=514891 R=tsepez@chromium.org Review URL: https://codereview.chromium.org/1388203003 .
Diffstat (limited to 'third_party/base/stl_util.h')
-rw-r--r--third_party/base/stl_util.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/third_party/base/stl_util.h b/third_party/base/stl_util.h
new file mode 100644
index 0000000000..fcbe5882a2
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+++ b/third_party/base/stl_util.h
@@ -0,0 +1,27 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PDFIUM_THIRD_PARTY_BASE_STL_UTIL_H_
+#define PDFIUM_THIRD_PARTY_BASE_STL_UTIL_H_
+
+#include <vector>
+
+namespace pdfium {
+
+// To treat a possibly-empty vector as an array, use these functions.
+// If you know the array will never be empty, you can use &*v.begin()
+// directly, but that is undefined behaviour if |v| is empty.
+template <typename T>
+inline T* vector_as_array(std::vector<T>* v) {
+ return v->empty() ? nullptr : &*v->begin();
+}
+
+template <typename T>
+inline const T* vector_as_array(const std::vector<T>* v) {
+ return v->empty() ? nullptr : &*v->begin();
+}
+
+} // namespace pdfium
+
+#endif // PDFIUM_THIRD_PARTY_BASE_STL_UTIL_H_