From 39d27b62457329d49ab02e43ba267b2574f2c9d6 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 11 May 2023 16:45:40 +0530
Subject: [PATCH] Restore suppression of informational log messages from PoDoFo

---
 src/calibre/utils/podofo/podofo.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/calibre/utils/podofo/podofo.cpp b/src/calibre/utils/podofo/podofo.cpp
index 4be6c410b9..ba9216b390 100644
--- a/src/calibre/utils/podofo/podofo.cpp
+++ b/src/calibre/utils/podofo/podofo.cpp
@@ -7,11 +7,20 @@
 using namespace PoDoFo;
 
 #include "global.h"
+#include <iostream>
 
 PyObject *pdf::Error = NULL;
 
 static char podofo_doc[] = "Wrapper for the PoDoFo PDF library";
 
+static void
+pdf_log_message(PdfLogSeverity logSeverity, const std::string_view& msg) {
+    if (logSeverity == PdfLogSeverity::Error || logSeverity == PdfLogSeverity::Warning) {
+        const char *level = logSeverity == PdfLogSeverity::Error ? "ERROR" : "WARNING";
+        std::cerr << "PoDoFo" << level << ": " << msg << std::endl;
+    }
+}
+
 static int
 exec_module(PyObject *m) {
     if (PyType_Ready(&pdf::PDFDocType) < 0) return -1;
@@ -23,6 +32,8 @@ exec_module(PyObject *m) {
 
     Py_INCREF(&pdf::PDFDocType);
     PyModule_AddObject(m, "PDFDoc", (PyObject *)&pdf::PDFDocType);
+
+    PdfCommon::SetLogMessageCallback(pdf_log_message);
 	return 0;
 }