Added cpl error codes to errcheck functions

GDAL raster methods return different error codes from the vector
API.

django/contrib/gis/gdal/error.py

@@ -42,14 +42,34 @@ OGRERR_DICT = {
 }
 OGRERR_NONE = 0
 
+# CPL Error Codes
+# http://www.gdal.org/cpl__error_8h.html
+CPLERR_DICT = {
+    1: (GDALException, 'AppDefined'),
+    2: (GDALException, 'OutOfMemory'),
+    3: (GDALException, 'FileIO'),
+    4: (GDALException, 'OpenFailed'),
+    5: (GDALException, 'IllegalArg'),
+    6: (GDALException, 'NotSupported'),
+    7: (GDALException, 'AssertionFailed'),
+    8: (GDALException, 'NoWriteAccess'),
+    9: (GDALException, 'UserInterrupt'),
+    10: (GDALException, 'ObjectNull'),
+}
+CPLERR_NONE = 0
 
-def check_err(code):
-    "Checks the given OGRERR, and raises an exception where appropriate."
 
-    if code == OGRERR_NONE:
+def check_err(code, cpl=False):
+    """
+    Checks the given CPL/OGRERR, and raises an exception where appropriate.
+    """
+    err_none = CPLERR_NONE if cpl else OGRERR_NONE
+    err_dict = CPLERR_DICT if cpl else OGRERR_DICT
+
+    if code == err_none:
         return
-    elif code in OGRERR_DICT:
-        e, msg = OGRERR_DICT[code]
+    elif code in err_dict:
+        e, msg = err_dict[code]
         raise e(msg)
     else:
-        raise OGRException('Unknown error code: "%s"' % code)
+        raise GDALException('Unknown error code: "%s"' % code)

django/contrib/gis/gdal/prototypes/errcheck.py

@@ -22,12 +22,12 @@ def ptr_byref(args, offset=-1):
 
 
 ### String checking Routines ###
-def check_const_string(result, func, cargs, offset=None):
+def check_const_string(result, func, cargs, offset=None, cpl=False):
     """
     Similar functionality to `check_string`, but does not free the pointer.
     """
     if offset:
-        check_err(result)
+        check_err(result, cpl=cpl)
         ptr = ptr_byref(cargs, offset)
         return ptr.value
     else:
@@ -101,20 +101,20 @@ def check_srs(result, func, cargs):
 
 
 ### Other error-checking routines ###
-def check_arg_errcode(result, func, cargs):
+def check_arg_errcode(result, func, cargs, cpl=False):
     """
     The error code is returned in the last argument, by reference.
     Check its value with `check_err` before returning the result.
     """
-    check_err(arg_byref(cargs))
+    check_err(arg_byref(cargs), cpl=cpl)
     return result
 
 
-def check_errcode(result, func, cargs):
+def check_errcode(result, func, cargs, cpl=False):
     """
     Check the error code returned (c_int).
     """
-    check_err(result)
+    check_err(result, cpl=cpl)
 
 
 def check_pointer(result, func, cargs):

django/contrib/gis/gdal/prototypes/generation.py

@@ -2,8 +2,8 @@
  This module contains functions that generate ctypes prototypes for the
  GDAL routines.
 """
-
 from ctypes import c_char_p, c_double, c_int, c_void_p
+from functools import partial
 from django.contrib.gis.gdal.prototypes.errcheck import (
     check_arg_errcode, check_errcode, check_geom, check_geom_offset,
     check_pointer, check_srs, check_str_arg, check_string, check_const_string)
@@ -13,12 +13,12 @@ class gdal_char_p(c_char_p):
     pass
 
 
-def double_output(func, argtypes, errcheck=False, strarg=False):
+def double_output(func, argtypes, errcheck=False, strarg=False, cpl=False):
     "Generates a ctypes function that returns a double value."
     func.argtypes = argtypes
     func.restype = c_double
     if errcheck:
-        func.errcheck = check_arg_errcode
+        func.errcheck = partial(check_arg_errcode, cpl=cpl)
     if strarg:
         func.errcheck = check_str_arg
     return func
@@ -66,7 +66,7 @@ def srs_output(func, argtypes):
     return func
 
 
-def const_string_output(func, argtypes, offset=None, decoding=None):
+def const_string_output(func, argtypes, offset=None, decoding=None, cpl=False):
     func.argtypes = argtypes
     if offset:
         func.restype = c_int
@@ -74,7 +74,7 @@ def const_string_output(func, argtypes, offset=None, decoding=None):
         func.restype = c_char_p
 
     def _check_const(result, func, cargs):
-        res = check_const_string(result, func, cargs, offset=offset)
+        res = check_const_string(result, func, cargs, offset=offset, cpl=cpl)
         if res and decoding:
             res = res.decode(decoding)
         return res
@@ -112,7 +112,7 @@ def string_output(func, argtypes, offset=-1, str_result=False, decoding=None):
     return func
 
 
-def void_output(func, argtypes, errcheck=True):
+def void_output(func, argtypes, errcheck=True, cpl=False):
     """
     For functions that don't only return an error code that needs to
     be examined.
@@ -123,7 +123,7 @@ def void_output(func, argtypes, errcheck=True):
         # `errcheck` keyword may be set to False for routines that
         # return void, rather than a status code.
         func.restype = c_int
-        func.errcheck = check_errcode
+        func.errcheck = partial(check_errcode, cpl=cpl)
     else:
         func.restype = None
 

django/contrib/gis/gdal/prototypes/raster.py

@@ -3,6 +3,8 @@ This module houses the ctypes function prototypes for GDAL DataSource (raster)
 related data structures.
 """
 from ctypes import c_char_p, c_double, c_int, c_void_p, POINTER
+from functools import partial
+
 from django.contrib.gis.gdal.libgdal import lgdal
 from django.contrib.gis.gdal.prototypes.generation import (const_string_output,
     double_output, int_output, void_output, voidptr_output)
@@ -11,6 +13,11 @@ from django.contrib.gis.gdal.prototypes.generation import (const_string_output,
 # http://gdal.org/gdal_8h.html
 # http://gdal.org/gdalwarper_8h.html
 
+# Prepare partial functions that use cpl error codes
+void_output = partial(void_output, cpl=True)
+const_string_output = partial(const_string_output, cpl=True)
+double_output = partial(double_output, cpl=True)
+
 ### Raster Driver Routines ###
 register_all = void_output(lgdal.GDALAllRegister, [])
 get_driver = voidptr_output(lgdal.GDALGetDriver, [c_int])