1 files changed, 12 insertions, 0 deletions
diff --git a/fitz/stm_buffer.c b/fitz/stm_buffer.c
index 7f9d521d..d70118e1 100644
--- a/fitz/stm_buffer.c
+++ b/fitz/stm_buffer.c
@@ -28,7 +28,12 @@ fz_buffer *
 fz_keep_buffer(fz_context *ctx, fz_buffer *buf)
 {
 	if (buf)
+	{
+		if (buf->refs == 1 && buf->cap > buf->len+1)
+			fz_resize_buffer(ctx, buf, buf->len);
 		buf->refs ++;
+	}
+
 	return buf;
 }
 
@@ -58,3 +63,10 @@ fz_grow_buffer(fz_context *ctx, fz_buffer *buf)
 {
 	fz_resize_buffer(ctx, buf, (buf->cap * 3) / 2);
 }
+
+void
+fz_trim_buffer(fz_context *ctx, fz_buffer *buf)
+{
+	if (buf->cap > buf->len+1)
+		fz_resize_buffer(ctx, buf, buf->len);
+}