#ifndef PurgeableBuffer_h
#define PurgeableBuffer_h
#include <wtf/Noncopyable.h>
#include <wtf/Vector.h>
namespace WebCore {
class PurgeableBuffer : Noncopyable {
public:
static PurgeableBuffer* create(const char* data, size_t);
static PurgeableBuffer* create(const Vector<char>& v) { return create(v.data(), v.size()); }
~PurgeableBuffer();
const char* data() const;
size_t size() const { return m_size; }
enum PurgePriority { PurgeLast, PurgeMiddle, PurgeFirst, PurgeDefault = PurgeMiddle };
PurgePriority purgePriority() const { return m_purgePriority; }
void setPurgePriority(PurgePriority);
bool isPurgeable() const { return m_state != NonVolatile; }
bool wasPurged() const;
bool makePurgeable(bool purgeable);
private:
PurgeableBuffer(char* data, size_t);
char* m_data;
size_t m_size;
PurgePriority m_purgePriority;
enum State { NonVolatile, Volatile, Purged };
mutable State m_state;
};
#if !PLATFORM(DARWIN) || defined(BUILDING_ON_TIGER) || PLATFORM(QT) || PLATFORM(GTK)
inline PurgeableBuffer* PurgeableBuffer::create(const char*, size_t) { return 0; }
inline PurgeableBuffer::~PurgeableBuffer() { }
inline const char* PurgeableBuffer::data() const { return 0; }
inline void PurgeableBuffer::setPurgePriority(PurgePriority) { }
inline bool PurgeableBuffer::wasPurged() const { return false; }
inline bool PurgeableBuffer::makePurgeable(bool) { return false; }
#endif
}
#endif