1 files changed, 106 insertions, 0 deletions
diff --git a/fs/cramfs/uncompress.c b/fs/cramfs/uncompress.c
new file mode 100644
index 0000000..170832a
--- /dev/null
+++ b/fs/cramfs/uncompress.c
@@ -0,0 +1,106 @@
+/*
+ * uncompress.c
+ *
+ * Copyright (C) 1999 Linus Torvalds
+ * Copyright (C) 2000-2002 Transmeta Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * cramfs interfaces to the uncompression library. There's really just
+ * three entrypoints:
+ *
+ *  - cramfs_uncompress_init() - called to initialize the thing.
+ *  - cramfs_uncompress_exit() - tell me when you're done
+ *  - cramfs_uncompress_block() - uncompress a block.
+ *
+ * NOTE NOTE NOTE! The uncompression is entirely single-threaded. We
+ * only have one stream, and we'll initialize it only once even if it
+ * then is used by multiple filesystems.
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <watchdog.h>
+#include <zlib.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_JFFS2)
+
+static z_stream stream;
+
+#define ZALLOC_ALIGNMENT	16
+
+static void *zalloc (void *x, unsigned items, unsigned size)
+{
+	void *p;
+
+	size *= items;
+	size = (size + ZALLOC_ALIGNMENT - 1) & ~(ZALLOC_ALIGNMENT - 1);
+
+	p = malloc (size);
+
+	return (p);
+}
+
+static void zfree (void *x, void *addr, unsigned nb)
+{
+	free (addr);
+}
+
+/* Returns length of decompressed data. */
+int cramfs_uncompress_block (void *dst, void *src, int srclen)
+{
+	int err;
+
+	inflateReset (&stream);
+
+	stream.next_in = src;
+	stream.avail_in = srclen;
+
+	stream.next_out = dst;
+	stream.avail_out = 4096 * 2;
+
+	err = inflate (&stream, Z_FINISH);
+
+	if (err != Z_STREAM_END)
+		goto err;
+	return stream.total_out;
+
+      err:
+	/*printf ("Error %d while decompressing!\n", err); */
+	/*printf ("%p(%d)->%p\n", src, srclen, dst); */
+	return -1;
+}
+
+int cramfs_uncompress_init (void)
+{
+	int err;
+
+	stream.zalloc = zalloc;
+	stream.zfree = zfree;
+	stream.next_in = 0;
+	stream.avail_in = 0;
+
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+	stream.outcb = (cb_func) WATCHDOG_RESET;
+#else
+	stream.outcb = Z_NULL;
+#endif /* CONFIG_HW_WATCHDOG */
+
+	err = inflateInit (&stream);
+	if (err != Z_OK) {
+		printf ("Error: inflateInit2() returned %d\n", err);
+		return -1;
+	}
+
+	return 0;
+}
+
+int cramfs_uncompress_exit (void)
+{
+	inflateEnd (&stream);
+	return 0;
+}
+
+#endif /* CFG_FS_CRAMFS */