fs/squashfs: enable LZ4 compression support
The structure is identical to the existing compressor implementations,
trivially adding lz4 decompression to sqfs_decompress.
The changes were tested using a sandbox build. An LZ4 compressed
squashfs image was bound as a host block device.
Signed-off-by: David Oberhollenzer <goliath@infraroot.at>
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
diff --git a/fs/squashfs/sqfs_decompressor.c b/fs/squashfs/sqfs_decompressor.c
index 6b3e01c..cfd1153 100644
--- a/fs/squashfs/sqfs_decompressor.c
+++ b/fs/squashfs/sqfs_decompressor.c
@@ -18,6 +18,10 @@
#include <u-boot/zlib.h>
#endif
+#if IS_ENABLED(CONFIG_LZ4)
+#include <u-boot/lz4.h>
+#endif
+
#if IS_ENABLED(CONFIG_ZSTD)
#include <linux/zstd.h>
#endif
@@ -38,6 +42,10 @@
case SQFS_COMP_ZLIB:
break;
#endif
+#if IS_ENABLED(CONFIG_LZ4)
+ case SQFS_COMP_LZ4:
+ break;
+#endif
#if IS_ENABLED(CONFIG_ZSTD)
case SQFS_COMP_ZSTD:
ctxt->zstd_workspace = malloc(zstd_dctx_workspace_bound());
@@ -66,6 +74,10 @@
case SQFS_COMP_ZLIB:
break;
#endif
+#if IS_ENABLED(CONFIG_LZ4)
+ case SQFS_COMP_LZ4:
+ break;
+#endif
#if IS_ENABLED(CONFIG_ZSTD)
case SQFS_COMP_ZSTD:
free(ctxt->zstd_workspace);
@@ -139,6 +151,17 @@
break;
#endif
+#if IS_ENABLED(CONFIG_LZ4)
+ case SQFS_COMP_LZ4:
+ ret = LZ4_decompress_safe(source, dest, src_len, *dest_len);
+ if (ret < 0) {
+ printf("LZ4 decompression failed.\n");
+ return -EINVAL;
+ }
+
+ ret = 0;
+ break;
+#endif
#if IS_ENABLED(CONFIG_ZSTD)
case SQFS_COMP_ZSTD:
ret = sqfs_zstd_decompress(ctxt, dest, *dest_len, source, src_len);