From b0f054e600bd07f540ac0a081dd8b5a8cc561617 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Thu, 8 Sep 2022 16:38:36 -0400
Subject: Add ability to initialize Pl_Function with a C-style function

---
 libtests/pl_function.cc | 59 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

(limited to 'libtests/pl_function.cc')

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;
 }
-- 
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