Partial/incremental decompression of clusters

src/bufdatastream.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2020 Veloman Yunkan
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
+ * NON-INFRINGEMENT.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ *
+ */
+
+#ifndef ZIM_BUFDATASTREAM_H
+#define ZIM_BUFDATASTREAM_H
+
+#include "idatastream.h"
+#include "debug.h"
+
+#include <string.h>
+
+namespace zim
+{
+
+class BufDataStream : public IDataStream
+{
+public: // functions
+  explicit BufDataStream(const char* data, size_t size)
+    : data_(data)
+    , size_(size)
+  {}
+
+protected:
+  void readImpl(void* buf, size_t nbytes) override;
+  Blob readBlobImpl(size_t size) override;
+
+
+private: // data
+  const char* data_;
+  size_t size_;
+};
+
+} // namespace zim
+
+#endif // ZIM_BUFDATASTREAM_H