[PATCH 1/2] bloblist: add api to get blob with size

[Raymond Mao]

bloblist_find function only returns the pointer of blob data,
which is fine for those self-describing data like FDT.
But as a common scenario, an interface is needed to retrieve both
the pointer and the size of the blob data.

Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
---
 common/bloblist.c  | 17 +++++++++++++++--
 include/bloblist.h | 18 ++++++++++++++++++
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/common/bloblist.c b/common/bloblist.c
index ec6ff7a5a9..efc1905da3 100644
--- a/common/bloblist.c
+++ b/common/bloblist.c
@@ -222,14 +222,27 @@ static int bloblist_ensurerec(uint tag, struct bloblist_rec **recp, int size,
 }
 
 void *bloblist_find(uint tag, int size)
+{
+	void *blob = NULL;
+	int blob_size;
+
+	blob = bloblist_get_blob(tag, &blob_size);
+
+	if (size && size != blob_size)
+		return NULL;
+
+	return blob;
+}
+
+void *bloblist_get_blob(uint tag, int *size)
 {
 	struct bloblist_rec *rec;
 
 	rec = bloblist_findrec(tag);
 	if (!rec)
 		return NULL;
-	if (size && size != rec->size)
-		return NULL;
+
+	*size = rec->size;
 
 	return (void *)rec + rec_hdr_size(rec);
 }
diff --git a/include/bloblist.h b/include/bloblist.h
index ff32d3fecf..a04c7c80be 100644
--- a/include/bloblist.h
+++ b/include/bloblist.h
@@ -250,6 +250,24 @@ static inline void *bloblist_check_magic(ulong addr)
 	return ptr;
 }
 
+#if CONFIG_IS_ENABLED(BLOBLIST)
+/**
+ * bloblist_get_blob() - Find a blob and get the size of it
+ *
+ * Searches the bloblist and returns the blob with the matching tag
+ *
+ * @tag:	Tag to search for (enum bloblist_tag_t)
+ * @size:	Size of the blob found
+ * Return: pointer to bloblist if found, or NULL if not found
+ */
+void *bloblist_get_blob(uint tag, int *size);
+#else
+static inline void *bloblist_get_blob(uint tag, int *size)
+{
+	return NULL;
+}
+#endif
+
 /**
  * bloblist_find() - Find a blob
  *
-- 
2.25.1