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 --- fs/squashfs/sqfs_decompressor.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+)

diff --git a/fs/squashfs/sqfs_decompressor.c b/fs/squashfs/sqfs_decompressor.c index 6b3e01cdad..cfd1153fd7 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 @@ int sqfs_decompressor_init(struct squashfs_ctxt *ctxt) 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 @@ void sqfs_decompressor_cleanup(struct squashfs_ctxt *ctxt) 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 @@ int sqfs_decompress(struct squashfs_ctxt *ctxt, void *dest,

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);