From 8130d50e3b5aa0235a133c3c5a3018ac01afb5e1 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Sat, 18 Jun 2022 13:38:36 -0400
Subject: Add C API to QPDFLogger

---
 libqpdf/qpdflogger-c.cc | 163 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 libqpdf/qpdflogger-c.cc

(limited to 'libqpdf/qpdflogger-c.cc')

diff --git a/libqpdf/qpdflogger-c.cc b/libqpdf/qpdflogger-c.cc
new file mode 100644
index 00000000..46fd9fba
--- /dev/null
+++ b/libqpdf/qpdflogger-c.cc
@@ -0,0 +1,163 @@
+#include <qpdf/qpdflogger-c.h>
+
+#include <qpdf/Pipeline.hh>
+#include <qpdf/QIntC.hh>
+#include <qpdf/QPDFLogger.hh>
+#include <functional>
+#include <memory>
+
+struct _qpdflogger_handle
+{
+    _qpdflogger_handle(std::shared_ptr<QPDFLogger> l);
+    ~_qpdflogger_handle() = default;
+
+    std::shared_ptr<QPDFLogger> l;
+};
+
+namespace
+{
+    class FunctionPipeline: public Pipeline
+    {
+      public:
+        FunctionPipeline(char const* identifier, qpdf_log_fn_t fn, void* udata);
+        virtual ~FunctionPipeline() = default;
+
+        virtual void write(unsigned char const* buf, size_t len) override;
+        virtual void finish() override;
+
+      private:
+        qpdf_log_fn_t fn;
+        void* udata;
+    };
+}; // namespace
+
+FunctionPipeline::FunctionPipeline(
+    char const* identifier, qpdf_log_fn_t fn, void* udata) :
+    Pipeline(identifier, nullptr),
+    fn(fn),
+    udata(udata)
+{
+}
+
+void
+FunctionPipeline::write(unsigned char const* buf, size_t len)
+{
+    fn(reinterpret_cast<char const*>(buf), QIntC::to_ulong(len), udata);
+}
+
+void
+FunctionPipeline::finish()
+{
+    // Nothing needed
+}
+
+_qpdflogger_handle::_qpdflogger_handle(std::shared_ptr<QPDFLogger> l) :
+    l(l)
+{
+}
+
+qpdflogger_handle
+qpdflogger_default_logger()
+{
+    return new _qpdflogger_handle(QPDFLogger::defaultLogger());
+}
+
+void
+qpdflogger_cleanup(qpdflogger_handle* l)
+{
+    delete *l;
+    *l = nullptr;
+}
+
+static void
+set_log_dest(
+    QPDFLogger* l,
+    std::function<void(std::shared_ptr<Pipeline>)> method,
+    qpdf_log_dest_e dest,
+    char const* identifier,
+    qpdf_log_fn_t fn,
+    void* udata)
+{
+    switch (dest) {
+    case qpdf_log_dest_default:
+        method(nullptr);
+        break;
+    case qpdf_log_dest_stdout:
+        method(l->standardOutput());
+        break;
+    case qpdf_log_dest_stderr:
+        method(l->standardError());
+        break;
+    case qpdf_log_dest_discard:
+        method(l->discard());
+        break;
+    case qpdf_log_dest_custom:
+        method(std::make_shared<FunctionPipeline>(identifier, fn, udata));
+        break;
+    }
+}
+
+static void
+set_log_dest(
+    QPDFLogger* l,
+    void (QPDFLogger::*method)(std::shared_ptr<Pipeline>),
+    qpdf_log_dest_e dest,
+    char const* identifier,
+    qpdf_log_fn_t fn,
+    void* udata)
+{
+    set_log_dest(
+        l,
+        std::bind(std::mem_fn(method), l, std::placeholders::_1),
+        dest,
+        identifier,
+        fn,
+        udata);
+}
+
+void
+qpdflogger_set_info(
+    qpdflogger_handle l, qpdf_log_dest_e dest, qpdf_log_fn_t fn, void* udata)
+{
+    set_log_dest(
+        l->l.get(), &QPDFLogger::setInfo, dest, "info logger", fn, udata);
+}
+
+void
+qpdflogger_set_warn(
+    qpdflogger_handle l, qpdf_log_dest_e dest, qpdf_log_fn_t fn, void* udata)
+{
+    set_log_dest(
+        l->l.get(), &QPDFLogger::setWarn, dest, "warn logger", fn, udata);
+}
+
+void
+qpdflogger_set_error(
+    qpdflogger_handle l, qpdf_log_dest_e dest, qpdf_log_fn_t fn, void* udata)
+{
+    set_log_dest(
+        l->l.get(), &QPDFLogger::setError, dest, "error logger", fn, udata);
+}
+
+void
+qpdflogger_set_save(
+    qpdflogger_handle l,
+    qpdf_log_dest_e dest,
+    qpdf_log_fn_t fn,
+    void* udata,
+    int only_if_not_set)
+{
+    auto method = std::bind(
+        std::mem_fn(&QPDFLogger::setSave),
+        l->l.get(),
+        std::placeholders::_1,
+        only_if_not_set);
+    set_log_dest(l->l.get(), method, dest, "save logger", fn, udata);
+}
+
+void
+qpdflogger_save_to_standard_output(qpdflogger_handle l, int only_if_not_set)
+{
+    qpdflogger_set_save(
+        l, qpdf_log_dest_stdout, nullptr, nullptr, only_if_not_set);
+}
-- 
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