Add ability to initialize Pl_Function with a C-style function

2 files changed, 68 insertions, 0 deletions

diff --git a/libtests/pl_function.cc b/libtests/pl_function.cc
index 101ec02e..2829671b 100644
--- a/libtests/pl_function.cc
+++ b/libtests/pl_function.cc
@@ -5,6 +5,38 @@
 #include <qpdf/Pl_String.hh>
 #include <iostream>
 
+namespace
+{
+    struct Count
+    {
+        int count{0};
+    };
+} // namespace
+
+int
+f(unsigned char const* data, size_t len, void* udata)
+{
+    auto c = reinterpret_cast<Count*>(udata);
+    ++c->count;
+    std::cout << "got " << data << "(" << len << ")" << std::endl;
+    if (c->count == 3) {
+        return 1;
+    }
+    return 0;
+}
+
+int
+g(char const* data, size_t len, void* udata)
+{
+    auto c = reinterpret_cast<Count*>(udata);
+    ++c->count;
+    std::cout << "signed got " << data << "(" << len << ")" << std::endl;
+    if (c->count == 2) {
+        return 2;
+    }
+    return 0;
+}
+
 int
 main(int argc, char* argv[])
 {
@@ -23,5 +55,32 @@ main(int argc, char* argv[])
     p2.finish();
     assert(s == "c2FsYWQ=");
 
+    Count c;
+    Pl_Function p3("c-function", nullptr, f, &c);
+    p3 << "one";
+    p3 << "two";
+    try {
+        p3 << "three";
+        assert(false);
+    } catch (std::runtime_error& e) {
+        std::cout << "three threw " << e.what() << std::endl;
+    }
+    p3 << "four";
+    p3.finish();
+    assert(c.count == 4);
+
+    c.count = 0;
+    Pl_Function p4("c-function", nullptr, g, &c);
+    p4 << "potato";
+    try {
+        p4 << "salad";
+        assert(false);
+    } catch (std::runtime_error& e) {
+        std::cout << "salad threw " << e.what() << std::endl;
+    }
+    p4 << "quack";
+    p4.finish();
+    assert(c.count == 3);
+
     return 0;
 }
diff --git a/libtests/qtest/pl_function/exp b/libtests/qtest/pl_function/exp
index fd2ea1bc..930240d9 100644
--- a/libtests/qtest/pl_function/exp
+++ b/libtests/qtest/pl_function/exp
@@ -1,2 +1,11 @@
 p1: 6: potato
 p2: 5: salad
+got one(3)
+got two(3)
+got three(5)
+three threw c-function function returned code 1
+got four(4)
+signed got potato(6)
+signed got salad(5)
+salad threw c-function function returned code 2
+signed got quack(5)