1 files changed, 50 insertions, 0 deletions
diff --git a/fitz/filt_copy.c b/fitz/filt_copy.c
new file mode 100644
index 00000000..f6a00ec0
--- /dev/null
+++ b/fitz/filt_copy.c
@@ -0,0 +1,50 @@
+#include "fitz_base.h"
+#include "fitz_stream.h"
+
+typedef struct fz_copyfilter_s fz_copyfilter;
+
+struct fz_copyfilter_s
+{
+	fz_filter super;
+};
+
+fz_error
+fz_newcopyfilter(fz_filter **fp)
+{
+    FZ_NEWFILTER(fz_copyfilter, f, copyfilter);
+    return fz_okay;
+}
+
+void
+fz_dropcopyfilter(fz_filter *f)
+{
+}
+
+fz_error
+fz_processcopyfilter(fz_filter *filter, fz_buffer *in, fz_buffer *out)
+{
+    fz_copyfilter *f = (fz_copyfilter*)filter;
+    int n;
+
+    while (1)
+    {
+	if (in->rp + 1 > in->wp)
+	{
+	    if (in->eof)
+		return fz_iodone;
+	    return fz_ioneedin;
+	}
+
+	if (out->wp + 1 > out->ep)
+	    return fz_ioneedout;
+
+	n = MIN(in->wp - in->rp, out->ep - out->wp);
+	if (n)
+	{
+	    memcpy(out->wp, in->rp, n);
+	    in->rp += n;
+	    out->wp += n;
+	}
+    }
+}
+