1 files changed, 83 insertions, 0 deletions
diff --git a/webapp/django/contrib/gis/gdal/libgdal.py b/webapp/django/contrib/gis/gdal/libgdal.py
new file mode 100644
index 0000000000..bf8933dffb
--- /dev/null
+++ b/webapp/django/contrib/gis/gdal/libgdal.py
@@ -0,0 +1,83 @@
+import os, sys
+from ctypes import c_char_p, CDLL
+from ctypes.util import find_library
+from django.contrib.gis.gdal.error import OGRException
+
+# Custom library path set?
+try:
+    from django.conf import settings
+    lib_path = settings.GDAL_LIBRARY_PATH
+except (AttributeError, EnvironmentError, ImportError):
+    lib_path = None
+
+if lib_path:
+    lib_names = None
+elif os.name == 'nt':
+    # Windows NT shared library
+    lib_names = ['gdal15']
+elif os.name == 'posix':
+    # *NIX library names.
+    lib_names = ['gdal', 'gdal1.5.0']
+else:
+    raise OGRException('Unsupported OS "%s"' % os.name)
+
+# Using the ctypes `find_library` utility  to find the 
+# path to the GDAL library from the list of library names.
+if lib_names:
+    for lib_name in lib_names:
+        lib_path = find_library(lib_name)
+        if not lib_path is None: break
+        
+if lib_path is None:
+    raise OGRException('Could not find the GDAL library (tried "%s"). '
+                       'Try setting GDAL_LIBRARY_PATH in your settings.' % 
+                       '", "'.join(lib_names))
+
+# This loads the GDAL/OGR C library
+lgdal = CDLL(lib_path)
+
+# On Windows, the GDAL binaries have some OSR routines exported with 
+# STDCALL, while others are not.  Thus, the library will also need to 
+# be loaded up as WinDLL for said OSR functions that require the 
+# different calling convention.
+if os.name == 'nt':
+    from ctypes import WinDLL
+    lwingdal = WinDLL(lib_name)
+
+def std_call(func):
+    """
+    Returns the correct STDCALL function for certain OSR routines on Win32
+    platforms.
+    """
+    if os.name == 'nt':
+        return lwingdal[func]
+    else:
+        return lgdal[func]
+
+#### Version-information functions. ####
+
+# Returns GDAL library version information with the given key.
+_version_info = std_call('GDALVersionInfo')
+_version_info.argtypes = [c_char_p]
+_version_info.restype = c_char_p
+
+def gdal_version():
+    "Returns only the GDAL version number information."
+    return _version_info('RELEASE_NAME')
+
+def gdal_full_version(): 
+    "Returns the full GDAL version information."
+    return _version_info('')
+
+def gdal_release_date(date=False): 
+    """
+    Returns the release date in a string format, e.g, "2007/06/27".
+    If the date keyword argument is set to True, a Python datetime object
+    will be returned instead.
+    """
+    from datetime import date as date_type
+    rel = _version_info('RELEASE_DATE')
+    yy, mm, dd = map(int, (rel[0:4], rel[4:6], rel[6:8]))
+    d = date_type(yy, mm, dd)
+    if date: return d
+    else: return d.strftime('%Y/%m/%d')