1 files changed, 59 insertions, 0 deletions
diff --git a/filter/filter.c b/filter/filter.c
new file mode 100644
index 00000000..8e28a532
--- /dev/null
+++ b/filter/filter.c
@@ -0,0 +1,59 @@
+#include <fitz.h>
+
+fz_error fz_kioneedin = {
+	.msg = {"<ioneedin>"},
+	.func = {"<process>"},
+	.file = {"filter.c"},
+    .line = 0,
+	.frozen = 1
+};
+
+fz_error fz_kioneedout = {
+	.msg = {"<ioneedout>"},
+	.func = {"<process>"},
+	.file = {"filter.c"},
+    .line = 0,
+	.frozen = 1
+};
+
+fz_error fz_kiodone = {
+	.msg = {"<iodone>"},
+	.func = {"<process>"},
+	.file = {"filter.c"},
+    .line = 0,
+	.frozen = 1
+};
+
+fz_error *
+fz_process(fz_filter *f, fz_buffer *in, fz_buffer *out)
+{
+	fz_error *reason;
+	unsigned char *oldrp;
+	unsigned char *oldwp;
+
+	assert(!out->eof);
+
+	oldrp = in->rp;
+	oldwp = out->wp;
+
+	reason = f->process(f, in, out);
+
+	assert(in->rp <= in->wp);
+	assert(out->wp <= out->ep);
+
+	f->consumed = in->rp > oldrp;
+	f->produced = out->wp > oldwp;
+	f->count += out->wp - oldwp;
+
+	if (reason != fz_ioneedin && reason != fz_ioneedout)
+		out->eof = 1;
+
+	return reason;
+}
+
+void
+fz_freefilter(fz_filter *f)
+{
+	f->free(f);
+}
+