[PATCH v3 3/4] fs/squashfs: add support for LZO decompression

[Joao Marcos Costa]

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 at bootlin.com>
---
Changes in v3:
	- Change commit message.
Changes in v2:
	- Change commit message.
 fs/squashfs/sqfs_decompressor.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/fs/squashfs/sqfs_decompressor.c b/fs/squashfs/sqfs_decompressor.c
index 8fdaaa853c..f57d7e2626 100644
--- 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
@@ -27,6 +32,10 @@ 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;
@@ -51,6 +60,10 @@ 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;
@@ -102,6 +115,18 @@ int sqfs_decompress(u16 comp_type, void *dest, unsigned long *dest_len,
 	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);
-- 
2.17.1