printing of default decompression parameters

glymur/lib/openjp2.py

@@ -201,6 +201,13 @@ class DecompressionParametersType(ctypes.Structure):
         # maximum number of tiles
         ("flags",             ctypes.c_uint32)]
 
+    def __str__(self):
+        msg = "{0}:\n".format(self.__class__)
+        for field_name, _ in self._fields_:
+            msg += "    {0}: {1}\n".format(
+                field_name, getattr(self, field_name))
+        return msg
+
 
 class CompressionParametersType(ctypes.Structure):
     """Compression parameters.

glymur/test/fixtures.py

@@ -900,3 +900,22 @@ goodstuff_with_full_header = r"""Codestream:
         Step size:  [(0, 8), (0, 9), (0, 9), (0, 10), (0, 9), (0, 9), (0, 10), (0, 9), (0, 9), (0, 10), (0, 9), (0, 9), (0, 10), (0, 9), (0, 9), (0, 10)]
     SOD marker segment @ (164, 0)
     EOC marker segment @ (115218, 0)"""
+
+decompression_parameters_type = """<class 'glymur.lib.openjp2.DecompressionParametersType'>:
+    cp_reduce: 0
+    cp_layer: 0
+    infile: b''
+    outfile: b''
+    decod_format: -1
+    cod_format: -1
+    DA_x0: 0
+    DA_x1: 0
+    DA_y0: 0
+    DA_y1: 0
+    m_verbose: 0
+    tile_index: 0
+    nb_tile_to_decode: 0
+    jpwl_correct: 0
+    jpwl_exp_comps: 0
+    jpwl_max_tiles: 0
+    flags: 0"""

glymur/test/test_printing.py

@@ -32,12 +32,13 @@ import lxml.etree as ET
 import glymur
 from glymur import Jp2k, command_line
 from . import fixtures
-from .fixtures import OPJ_DATA_ROOT, opj_data_file
-from .fixtures import WARNING_INFRASTRUCTURE_ISSUE, WARNING_INFRASTRUCTURE_MSG
-from .fixtures import text_gbr_27, text_gbr_33, text_gbr_34
+from .fixtures import (
+        OPJ_DATA_ROOT, opj_data_file,
+        WARNING_INFRASTRUCTURE_ISSUE, WARNING_INFRASTRUCTURE_MSG,
+        WINDOWS_TMP_FILE_MSG, text_gbr_27, text_gbr_33, text_gbr_34
+)
 
-
-@unittest.skipIf(os.name == "nt", "Temporary file issue on window.")
+@unittest.skipIf(os.name == "nt", WINDOWS_TMP_FILE_MSG)
 class TestPrinting(unittest.TestCase):
     """Tests for verifying how printing works."""
     def setUp(self):
@@ -617,6 +618,24 @@ class TestPrinting(unittest.TestCase):
 
         self.assertEqual(actual, expected)
 
+@unittest.skipIf(re.match('1|2.0', glymur.version.openjpeg_version),
+                 "Requires openjpeg 2.1.0 or higher")
+class TestPrintingOpenjp2(unittest.TestCase):
+    """Tests for verifying how printing works on openjp2 library structures."""
+    def setUp(self):
+        self.jp2file = glymur.data.nemo()
+
+    def tearDown(self):
+        pass
+
+    def test_decompression_parameters(self):
+        """printing DecompressionParametersType"""
+        dparams = glymur.lib.openjp2.set_default_decoder_parameters()
+        with patch('sys.stdout', new=StringIO()) as fake_out:
+            print(dparams)
+            actual = fake_out.getvalue().strip()
+        expected = fixtures.decompression_parameters_type
+        self.assertEqual(actual, expected)
 
 @unittest.skipIf(OPJ_DATA_ROOT is None,
                  "OPJ_DATA_ROOT environment variable not set")