Add Pl_Function -- a generic function pipeline

1 files changed, 39 insertions, 0 deletions

diff --git a/libqpdf/Pl_Function.cc b/libqpdf/Pl_Function.cc
new file mode 100644
index 00000000..32fcccf1
--- /dev/null
+++ b/libqpdf/Pl_Function.cc
@@ -0,0 +1,39 @@
+#include <qpdf/Pl_Function.hh>
+
+#include <qpdf/QUtil.hh>
+#include <errno.h>
+#include <stdexcept>
+
+Pl_Function::Members::Members(writer_t fn) :
+    fn(fn)
+{
+}
+
+Pl_Function::Pl_Function(char const* identifier, Pipeline* next, writer_t fn) :
+    Pipeline(identifier, next),
+    m(new Members(fn))
+{
+}
+
+Pl_Function::~Pl_Function()
+{
+    // Must be explicit and not inline -- see QPDF_DLL_CLASS in
+    // README-maintainer
+}
+
+void
+Pl_Function::write(unsigned char const* buf, size_t len)
+{
+    this->m->fn(buf, len);
+    if (getNext(true)) {
+        getNext()->write(buf, len);
+    }
+}
+
+void
+Pl_Function::finish()
+{
+    if (getNext(true)) {
+        getNext()->finish();
+    }
+}