Set the result pointer after swapping buffers.

In the CCITTFaxDecode filter, the result pointer was reset before
swapping the buffers, so each line was copied to the output buffer only
after decoding the following line. This was leading to a duplication of
the first line and a missing last line.

1 files changed, 3 insertions, 2 deletions

diff --git a/fitz/filt_faxd.c b/fitz/filt_faxd.c
index 5da826ae..714629e7 100644
--- a/fitz/filt_faxd.c
+++ b/fitz/filt_faxd.c
@@ -625,14 +625,15 @@ eol:
 	if (fax->rp < fax->wp)
 		return p - buf;
 
-	fax->rp = fax->dst;
-	fax->wp = fax->dst + fax->stride;
 
 	tmp = fax->ref;
 	fax->ref = fax->dst;
 	fax->dst = tmp;
 	memset(fax->dst, 0, fax->stride);
 
+	fax->rp = fax->dst;
+	fax->wp = fax->dst + fax->stride;
+
 	fax->stage = SNORMAL;
 	fax->c = 0;
 	fax->a = -1;