libio: remove ostream_append_sparse and fallback implementation

Instead of a separate append-sparse function, simply accept NULL
as an input for append. For both Unix and Win32, a fallback needs
to be implemented. For XFRM, we can just memset the input buffer
to zero, same for the libsquashfs data writer.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 6 insertions, 2 deletions

diff --git a/lib/io/src/xfrm/ostream.c b/lib/io/src/xfrm/ostream.c
index 79ed49a..e55e38c 100644
--- a/lib/io/src/xfrm/ostream.c
+++ b/lib/io/src/xfrm/ostream.c
@@ -82,10 +82,14 @@ static int xfrm_append(ostream_t *strm, const void *data, size_t size)
 		if (diff > size)
 			diff = size;
 
-		memcpy(xfrm->inbuf + xfrm->inbuf_used, data, diff);
+		if (data == NULL) {
+			memset(xfrm->inbuf + xfrm->inbuf_used, 0, diff);
+		} else {
+			memcpy(xfrm->inbuf + xfrm->inbuf_used, data, diff);
+			data = (const char *)data + diff;
+		}
 
 		xfrm->inbuf_used += diff;
-		data = (const char *)data + diff;
 		size -= diff;
 	}