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diff --git a/src/dictzip-input-stream.h b/src/dictzip-input-stream.h
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+/*
+ * dictzip-input-stream.h: dictzip GIO stream reader
+ *
+ * Copyright (c) 2013, Přemysl Janouch <p.janouch@gmail.com>
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#ifndef DICTZIP_INPUT_STREAM_H
+#define DICTZIP_INPUT_STREAM_H
+
+/** Random-access dictzip reader. */
+typedef struct dictzip_input_stream          DictzipInputStream;
+typedef struct dictzip_input_stream_class    DictzipInputStreamClass;
+typedef struct dictzip_input_stream_private  DictzipInputStreamPrivate;
+
+/* GObject boilerplate. */
+#define DICTZIP_TYPE_INPUT_STREAM  (dictzip_input_stream_get_type ())
+#define DICTZIP_INPUT_STREAM(obj) \
+	(G_TYPE_CHECK_INSTANCE_CAST ((obj), \
+	DICTZIP_TYPE_INPUT_STREAM, DictzipInputStream))
+#define DICTZIP_IS_INPUT_STREAM(obj) \
+	(G_TYPE_CHECK_INSTANCE_TYPE ((obj), \
+	DICTZIP_TYPE_INPUT_STREAM))
+#define DICTZIP_INPUT_STREAM_CLASS(klass) \
+	(G_TYPE_CHECK_CLASS_CAST ((klass), \
+	DICTZIP_TYPE_INPUT_STREAM, DictzipInputStreamClass))
+#define DICTZIP_IS_INPUT_STREAM_CLASS(klass) \
+	(G_TYPE_CHECK_CLASS_TYPE ((klass), \
+	DICTZIP_TYPE_INPUT_STREAM))
+#define DICTZIP_INPUT_STREAM_GET_CLASS(obj) \
+	(G_TYPE_INSTANCE_GET_CLASS ((obj), \
+	DICTZIP_TYPE_INPUT_STREAM, DictzipInputStreamClass))
+
+// --- Errors ------------------------------------------------------------------
+
+typedef enum {
+	DICTZIP_ERROR_NOT_SEEKABLE,        //!< Underlying stream isn't seekable
+	DICTZIP_ERROR_INVALID_HEADER       //!< Error occured while parsing header
+} DictzipError;
+
+#define DICTZIP_ERROR  (dictzip_error_quark ())
+
+GQuark dictzip_error_quark (void);
+
+// --- DictzipInputStream ------------------------------------------------------
+
+struct dictzip_input_stream
+{
+	GFilterInputStream parent_instance;
+	DictzipInputStreamPrivate *priv;
+};
+
+struct dictzip_input_stream_class
+{
+	GFilterInputStreamClass parent_class;
+};
+
+GType dictzip_input_stream_get_type (void);
+DictzipInputStream *dictzip_input_stream_new
+	(GInputStream *base_stream, GError **error);
+GFileInfo *dictzip_input_stream_get_file_info (DictzipInputStream *self);
+
+
+#endif /* ! DICTZIP_INPUT_STREAM_H */