Reworked configuration testing to look at both openjp2 and openjpeg.

glymur/lib/openjp2.py

@@ -1,6 +1,9 @@
 """
 Wraps individual functions in openjp2 library.
 """
+import ctypes
+import platform
+from ctypes.util import find_library
 
 
 def _glymurrc_fname():
@@ -23,19 +26,46 @@ def _glymurrc_fname():
         fname = os.path.join(confdir, 'glymurrc')
         if os.path.exists(fname):
             return fname
-        else:
-            msg = "Configuration file '{0}' does not exist.".format(confdir)
-            warnings.warn(msg, UserWarning)
 
     # didn't find a configuration file.
     return None
 
 
-def _config():
-    """Read configuration file.
+def _get_openjpeg_config():
+    libopenjpeg_path = find_library('openjpeg')
+    
+    # If we could not find it, then look in some likely locations.
+    if libopenjpeg_path is None:
+        if platform.system() == 'Darwin':
+            path = '/opt/local/lib/libopenjpeg.dylib'
+            if os.path.exists(path):
+                libopenjpeg_path = path
+        elif os.name == 'nt':
+            path = os.path.join('C:\\', 'Program files', 'OpenJPEG 1.5',
+                                'bin', 'openjpeg.dll')
+            if os.path.exists(path):
+                libopenjpeg_path = path
 
-    Based on matplotlib.
-    """
+    try:
+        if os.name == "nt":
+            _OPENJPEG = ctypes.windll.LoadLibrary(libopenjpeg_path)
+        else:    
+            _OPENJPEG = ctypes.CDLL(libopenjpeg_path)
+    except OSError:
+        _OPENJPEG = None
+        
+    if _OPENJPEG is not None:
+        # Must be at least 1.5.0
+        _OPENJPEG.opj_version.restype = ctypes.c_char_p
+        v = _OPENJPEG.opj_version()
+        v = v.decode('utf-8')
+        major, minor, patch = v.split('.')
+        if minor != '5':
+            _OPENJPEG = None
+    return _OPENJPEG
+
+
+def _get_openjp2_config():
     filename = _glymurrc_fname()
     if filename is not None:
         # Read the configuration file for the library location.
@@ -44,7 +74,6 @@ def _config():
         libopenjp2_path = parser.get('library', 'openjp2')
     else:
         # No help from the config file, try to find it ourselves.
-        from ctypes.util import find_library
         libopenjp2_path = find_library('openjp2')
 
     if libopenjp2_path is None:
@@ -60,6 +89,13 @@ def _config():
     return _OPENJP2
 
 
+def _config():
+    """Read configuration file.
+    """
+    _OPENJP2 = _get_openjp2_config()
+    _OPENJPEG = _get_openjpeg_config()
+    return _OPENJP2, _OPENJPEG
+
 def _get_configdir():
     """Return string representing the configuration directory.
 
@@ -73,7 +109,6 @@ def _get_configdir():
     if 'HOME' in os.environ:
         return os.path.join(os.environ['HOME'], '.config', 'glymur')
 
-import ctypes
 import os
 import warnings
 
@@ -85,7 +120,12 @@ else:
     from configparser import ConfigParser
     from configparser import NoOptionError
 
-_OPENJP2 = _config()
+_OPENJP2, _OPENJPEG = _config()
+if _OPENJP2 is None and _OPENJPEG is None:
+    msg = "Neither the glymur configuration file could not be located "
+    msg += "nor could openjpeg 1.5.1 be located.  Glymur can only "
+    msg += "operate under extremely degraded conditions."
+    warnings.warn(msg, UserWarning)
 
 import numpy as np
 

glymur/test/__init__.py

@@ -1,5 +1,6 @@
 from .test_callbacks import TestCallbacks as callbacks
 from .test_codestream import TestCodestream as codestream
+from .test_config import TestSuite as config
 from .test_jp2k import TestJp2k as jp2k
 from .test_jp2k_15 import TestSuite as jp2k15
 from .test_icc import TestICC as icc

glymur/test/test_config.py

@@ -1,3 +1,7 @@
+"""These tests are for edge cases where OPENJPEG does not exist, but 
+OPENJP2 may be present in some form or other.
+"""
+
 import imp
 import os
 import sys
@@ -16,21 +20,33 @@ from glymur import Jp2k
 from glymur.lib import openjp2 as opj2
 
 
+@unittest.skip("Cannot work when both OPENJPEG and OPENJP2 are both present.")
+@unittest.skipIf(glymur.lib.openjp2._OPENJP2 is None,
+                 "Needs openjp2 library first before these tests make sense.")
 @unittest.skipIf(sys.hexversion < 0x03020000,
                  "Uses features introduced in 3.2.")
-class TestJp2k(unittest.TestCase):
+class TestSuite(unittest.TestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        # Monkey patch the package so as to ignore OPENJPEG if it exists.
+        cls.openjpeg = glymur.lib.openjpeg._OPENJPEG
+        glymur.lib.openjp2._OPENJPEG = None
+
+    @classmethod
+    def tearDownClass(cls):
+        # Restore OPENJPEG
+        glymur.lib.openjpeg._OPENJPEG = cls.openjpeg
+
     def setUp(self):
-        self.jp2file = pkg_resources.resource_filename(glymur.__name__,
-                                                       "data/nemo.jp2")
         imp.reload(glymur)
         imp.reload(glymur.lib.openjp2)
+        self.jp2file = glymur.data.nemo()
 
     def tearDown(self):
         imp.reload(glymur)
         imp.reload(glymur.lib.openjp2)
 
-    @unittest.skipIf(glymur.lib.openjp2._OPENJP2 is None,
-                     "Needs openjp2 library first.")
     def test_config_file_via_environ(self):
         """Verify that we can read a configuration file set via environ var."""
         with tempfile.TemporaryDirectory() as tdir: