fs/squashfs: add support for LZO decompression

Add call to lzo's lzo1x_decompress_safe() into sqfs_decompress().

U-Boot's LZO sources may still have some unsolved issues that could make the
decompression crash when dealing with fragmented files, so those should be
avoided. The "-no-fragments" option can be passed to mksquashfs.

Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>

diff --git a/fs/squashfs/sqfs_decompressor.c b/fs/squashfs/sqfs_decompressor.c
index 9457ee5..d69ddb2 100644 (file)
--- a/fs/squashfs/sqfs_decompressor.c
+++ b/fs/squashfs/sqfs_decompressor.c
@@ -9,6 +9,11 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+
+#if IS_ENABLED(CONFIG_LZO)
+#include <linux/lzo.h>
+#endif
+
 #if IS_ENABLED(CONFIG_ZLIB)
 #include <u-boot/zlib.h>
 #endif
@@ -25,6 +30,10 @@ int sqfs_decompressor_init(struct squashfs_ctxt *ctxt)
        u16 comp_type = get_unaligned_le16(&ctxt->sblk->compression);
 
        switch (comp_type) {
+#if IS_ENABLED(CONFIG_LZO)
+       case SQFS_COMP_LZO:
+               break;
+#endif
 #if IS_ENABLED(CONFIG_ZLIB)
        case SQFS_COMP_ZLIB:
                break;
@@ -49,6 +58,10 @@ void sqfs_decompressor_cleanup(struct squashfs_ctxt *ctxt)
        u16 comp_type = get_unaligned_le16(&ctxt->sblk->compression);
 
        switch (comp_type) {
+#if IS_ENABLED(CONFIG_LZO)
+       case SQFS_COMP_LZO:
+               break;
+#endif
 #if IS_ENABLED(CONFIG_ZLIB)
        case SQFS_COMP_ZLIB:
                break;
@@ -101,6 +114,18 @@ int sqfs_decompress(struct squashfs_ctxt *ctxt, void *dest,
        int ret = 0;
 
        switch (comp_type) {
+#if IS_ENABLED(CONFIG_LZO)
+       case SQFS_COMP_LZO: {
+               size_t lzo_dest_len = *dest_len;
+               ret = lzo1x_decompress_safe(source, src_len, dest, &lzo_dest_len);
+               if (ret) {
+                       printf("LZO decompression failed. Error code: %d\n", ret);
+                       return -EINVAL;
+               }
+
+               break;
+       }
+#endif
 #if IS_ENABLED(CONFIG_ZLIB)
        case SQFS_COMP_ZLIB:
                ret = uncompress(dest, dest_len, source, src_len);