1 files changed, 59 insertions, 0 deletions
diff --git a/fs/squashfs/sqfs_decompressor.c b/fs/squashfs/sqfs_decompressor.c
new file mode 100644
index 0000000000..09ca6cf6d0
--- /dev/null
+++ b/fs/squashfs/sqfs_decompressor.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Bootlin
+ *
+ * Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
+ */
+
+#include <errno.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#if IS_ENABLED(CONFIG_ZLIB)
+#include <u-boot/zlib.h>
+#endif
+
+#include "sqfs_decompressor.h"
+#include "sqfs_filesystem.h"
+#include "sqfs_utils.h"
+
+#if IS_ENABLED(CONFIG_ZLIB)
+static void zlib_decompression_status(int ret)
+{
+	switch (ret) {
+	case Z_BUF_ERROR:
+		printf("Error: 'dest' buffer is not large enough.\n");
+		break;
+	case Z_DATA_ERROR:
+		printf("Error: corrupted compressed data.\n");
+		break;
+	case Z_MEM_ERROR:
+		printf("Error: insufficient memory.\n");
+		break;
+	}
+}
+#endif
+
+int sqfs_decompress(u16 comp_type, void *dest, unsigned long *dest_len,
+		    void *source, u32 lenp)
+{
+	int ret = 0;
+
+	switch (comp_type) {
+#if IS_ENABLED(CONFIG_ZLIB)
+	case SQFS_COMP_ZLIB:
+		ret = uncompress(dest, dest_len, source, lenp);
+		if (ret) {
+			zlib_decompression_status(ret);
+			return -EINVAL;
+		}
+
+		break;
+#endif
+	default:
+		printf("Error: unknown compression type.\n");
+		return -EINVAL;
+	}
+
+	return ret;
+}