1 files changed, 93 insertions, 0 deletions

diff --git a/xbmc/utils/auto_buffer.h b/xbmc/utils/auto_buffer.h
new file mode 100644
index 0000000..066b6f8
--- /dev/null
+++ b/xbmc/utils/auto_buffer.h
@@ -0,0 +1,93 @@
+/*
+ *  Copyright (C) 2013-2018 Team Kodi
+ *  This file is part of Kodi - https://kodi.tv
+ *
+ *  SPDX-License-Identifier: GPL-2.0-or-later
+ *  See LICENSES/README.md for more information.
+ */
+
+#pragma once
+
+#include <stddef.h> // for size_t
+
+namespace XUTILS
+{
+
+  class auto_buffer
+  {
+  public:
+    /**
+     * Create buffer with zero size
+     */
+    auto_buffer(void) = default;
+    /**
+     * Create buffer with specified size
+     * @param size of created buffer
+     */
+    explicit auto_buffer(size_t size);
+    ~auto_buffer();
+
+    /**
+     * Allocate specified size for buffer, discarding current buffer content
+     * @param size of buffer to allocate
+     * @return reference to itself
+     */
+    auto_buffer& allocate(size_t size);
+    /**
+     * Resize current buffer to new size. Buffer will be extended or truncated at the end.
+     * @param newSize of buffer
+     * @return reference to itself
+     */
+    auto_buffer& resize(size_t newSize);
+    /**
+     * Reset buffer to zero size
+     * @return reference to itself
+     */
+    auto_buffer& clear(void);
+
+    /**
+     * Get pointer to buffer content
+     * @return pointer to buffer content or NULL if buffer is zero size
+     */
+    inline char* get(void) { return static_cast<char*>(p); }
+    /**
+     * Get constant pointer to buffer content
+     * @return constant pointer to buffer content
+     */
+    inline const char* get(void) const { return static_cast<char*>(p); }
+    /**
+     * Get size of the buffer
+     * @return size of the buffer
+     */
+    inline size_t size(void) const { return s; }
+    /**
+     * Get size of the buffer
+     * @return size of the buffer
+     */
+    inline size_t length(void) const { return s; }
+
+    /**
+     * Attach malloc'ed pointer to the buffer, discarding current buffer content
+     * Pointer must be acquired by malloc() or realloc().
+     * Pointer will be automatically freed on destroy of the buffer.
+     * @param pointer to attach
+     * @param size of new memory region pointed by pointer
+     * @return reference to itself
+     */
+    auto_buffer& attach(void* pointer, size_t size);
+    /**
+     * Detach current buffer content from the buffer, reset buffer to zero size
+     * Caller is responsible to free memory by calling free() for returned pointer
+     * when pointer in not needed anymore
+     * @return detached from buffer pointer to content
+     */
+    void* detach(void);
+
+  private:
+    auto_buffer(const auto_buffer& other) = delete; // disallow copy constructor
+    auto_buffer& operator=(const auto_buffer& other) = delete; // disallow assignment
+
+    void* p = 0;
+    size_t s = 0;
+  };
+}