Add test to validate jpeg parse

samples/CMakeLists.txt

@@ -14,6 +14,7 @@ set(SAMPLES
     iptceasy.cpp
     iptcprint.cpp
     iptctest.cpp
+    jpegparsetest.cpp
     key-test.cpp
     largeiptc-test.cpp
     mmap-test.cpp

samples/jpegparsetest.cpp

@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Sample program to dump the XMP packet of an image
+
+#include <exiv2/exiv2.hpp>
+#include <exiv2/image_types.hpp>
+#include <iostream>
+
+int main(int argc, char* const argv[]) {
+  try {
+    if (argc != 2) {
+      std::cout << "Usage: " << argv[0] << " file\n";
+      return EXIT_FAILURE;
+    }
+
+    auto image = Exiv2::ImageFactory::open(argv[1]);
+    if (image->imageType() == Exiv2::ImageType::jpeg) {
+      Exiv2::JpegImage* jpegImage = dynamic_cast<Exiv2::JpegImage*>(image.get());
+      jpegImage->readMetadata();
+      std::cout << "Number of color components: " << jpegImage->numColorComponents() << "\n";
+      std::cout << "Encoding process: " << jpegImage->encodingProcess() << "\n";
+    }
+
+    return EXIT_SUCCESS;
+  } catch (Exiv2::Error& e) {
+    std::cout << "Caught Exiv2 exception '" << e << "'\n";
+    return EXIT_FAILURE;
+  }
+}

tests/bash_tests/test_jpegparse.py

@@ -0,0 +1,13 @@
+# -*- coding: utf-8 -*-
+
+import system_tests
+
+class TestExifIPTCXmpTagOutput(metaclass=system_tests.CaseMeta):
+    url = "https://github.com/Exiv2/exiv2/pull/2279"
+
+    # Test extraction of jpeg specific metadata
+    filename = "$data_path/exiv2-fujifilm-finepix-s2pro.jpg"
+    commands = ["$jpegparsetest $filename"]
+    stderr = [""] * len(commands)
+    stdout = ["""Number of color components: 3\nEncoding process: Baseline DCT, Huffman coding\n"""]
+    retval = [0] * len(commands)

tests/suite.conf

@@ -35,6 +35,7 @@ tiff_test: ${ENV:exiv2_path}/tiff-test
 largeiptc_test: ${ENV:exiv2_path}/largeiptc-test
 easyaccess_test: ${ENV:exiv2_path}/easyaccess-test
 taglist: ${ENV:exiv2_path}/taglist
+jpegparsetest: ${ENV:exiv2_path}/jpegparsetest
 
 [variables]
 kerOffsetOutOfRange: Offset out of range