Index: uspace/app/gunzip/Makefile
===================================================================
--- uspace/app/gunzip/Makefile	(revision 83b7f4d0e2775446c94394f1ea7f0544e6c78154)
+++ uspace/app/gunzip/Makefile	(revision 83b7f4d0e2775446c94394f1ea7f0544e6c78154)
@@ -0,0 +1,38 @@
+#
+# Copyright (c) 2017 Jiri Svoboda
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# - Redistributions of source code must retain the above copyright
+#   notice, this list of conditions and the following disclaimer.
+# - Redistributions in binary form must reproduce the above copyright
+#   notice, this list of conditions and the following disclaimer in the
+#   documentation and/or other materials provided with the distribution.
+# - The name of the author may not be used to endorse or promote products
+#   derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+
+USPACE_PREFIX = ../..
+BINARY = gunzip
+
+EXTRA_CFLAGS += -I$(LIBCOMPRESS_PREFIX)
+LIBS = $(LIBCOMPRESS_PREFIX)/libcompress.a
+
+SOURCES = \
+	gunzip.c
+
+include $(USPACE_PREFIX)/Makefile.common
Index: uspace/app/gunzip/gunzip.c
===================================================================
--- uspace/app/gunzip/gunzip.c	(revision 83b7f4d0e2775446c94394f1ea7f0544e6c78154)
+++ uspace/app/gunzip/gunzip.c	(revision 83b7f4d0e2775446c94394f1ea7f0544e6c78154)
@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2017 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup gunzip
+ * @{
+ */
+/** @file
+ */
+
+#include <errno.h>
+#include <gzip.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
+{
+	int rc;
+	void *data, *ddata;
+	size_t size, dsize;
+	size_t nread, nwr;
+	long len;
+	FILE *f, *wf;
+
+	if (argc != 3) {
+		printf("syntax: gunzip <src.gz> <dest>\n");
+		return 1;
+	}
+
+	f = fopen(argv[1], "rb");
+	if (f == NULL) {
+		printf("Error opening '%s'\n", argv[1]);
+		return 1;
+	}
+
+	rc = fseek(f, 0, SEEK_END);
+	if (rc != 0) {
+		printf("Error determining size of '%s'\n", argv[1]);
+		fclose(f);
+		return 1;
+	}
+
+	len = ftell(f);
+	if (len < 0) {
+		printf("Error determining size of '%s'\n", argv[1]);
+		fclose(f);
+		return 1;
+	}
+
+	rc = fseek(f, 0, SEEK_SET);
+	if (rc != 0) {
+		printf ("Error rewinding '%s'\n", argv[1]);
+		fclose(f);
+		return 1;
+	}
+
+	data = malloc(len);
+	if (data == NULL) {
+		printf("Error allocating %ld bytes.\n", len);
+		fclose(f);
+		return 1;
+	}
+
+	nread = fread(data, 1, len, f);
+	if (nread != (size_t)len) {
+		printf("Error reading '%s'\n", argv[1]);
+		fclose(f);
+		return 1;
+	}
+
+	fclose(f);
+
+	size = (size_t) len;
+
+	rc = gzip_expand(data, size, &ddata, &dsize);
+	if (rc != EOK) {
+		printf("Error decompressing data.\n");
+		return 1;
+	}
+
+	wf = fopen(argv[2], "wb");
+	if (wf == NULL) {
+		printf("Error creating file '%s'\n", argv[2]);
+		return 1;
+	}
+
+	nwr = fwrite(ddata, 1, dsize, wf);
+	if (nwr != dsize) {
+		printf("Error writing '%s'\n", argv[2]);
+		fclose(wf);
+		return 1;
+	}
+
+	if (fclose(wf) != 0) {
+		printf("Error writing '%s'\n", argv[2]);
+		return 1;
+	}
+
+	return 0;
+}
+
+/** @}
+ */