defaultenv: use a compressed version when embedded in barebox

enable it only if a compression is enabled
support gzip, bzip2 and lzo

you will be able to choose which compression to use

-rw-r--r--  1 root root    8436 Dec 15 01:35 barebox_default_env
-rw-r--r--  1 root root    2782 Dec 15 01:35 barebox_default_env.bz2
-rw-r--r--  1 root root    2691 Dec 15 01:38 barebox_default_env.gz
-rw-r--r--  1 root root    3262 Dec 15 01:38 barebox_default_env.lzo

with using gzip and the default env we can save 5.6KiB (5,745 bytes)
with using bzip2 and the default env we can save 5.5KiB (5,654 bytes)
with using lzo and the default env we can save 5.1KiB (5,174 bytes)

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 27 insertions, 2 deletions

diff --git a/common/startup.c b/common/startup.c
index 13783fb27a..180fdc3599 100644
--- a/common/startup.c
+++ b/common/startup.c
@@ -64,10 +64,35 @@ static void display_meminfo(void)
 #ifdef CONFIG_DEFAULT_ENVIRONMENT
 #include <generated/barebox_default_env.h>
 
+#ifdef CONFIG_DEFAULT_ENVIRONMENT_COMPRESSED
+#include <uncompress.h>
+void *defaultenv;
+#else
+#define defaultenv default_environment
+#endif
+
 static int register_default_env(void)
 {
-	add_mem_device("defaultenv", (unsigned long)default_environment,
-		       sizeof(default_environment),
+#ifdef CONFIG_DEFAULT_ENVIRONMENT_COMPRESSED
+	int ret;
+	void *tmp;
+
+	tmp = xzalloc(default_environment_size);
+	memcpy(tmp, default_environment, default_environment_size);
+
+	defaultenv = xzalloc(default_environment_uncompress_size);
+
+	ret = uncompress(tmp, default_environment_size, NULL, NULL,
+			 defaultenv, NULL, uncompress_err_stdout);
+
+	free(tmp);
+
+	if (ret)
+		return ret;
+#endif
+
+	add_mem_device("defaultenv", (unsigned long)defaultenv,
+		       default_environment_uncompress_size,
 		       IORESOURCE_MEM_WRITEABLE);
 	return 0;
 }