Add functions to get and set GDAL and proj4 data dir paths

Author: jimmysoda

source/pdal/pdalc_config.cpp

@@ -13,6 +13,67 @@ namespace pdal
 {
 	namespace capi
 	{
+		std::ofstream pdalcConfigLog("pdalc_config.log");
+
+		void setenv(const char *name, const char *value)
+		{
+#if defined(_MSC_VER)
+			_putenv_s(name, value);
+#else
+			std::setenv(std::string(name + "=" + value).c_str());
+#endif
+		}
+
+		size_t PDALGetGdalDataPath(char *path, size_t size)
+		{
+			size_t length = 0;
+
+			if (path && size > 0)
+			{
+				path[0] = '\0';
+				path[size-1] = '\0';
+
+				std::string s = std::getenv("GDAL_DATA");
+				std::strncpy(path, s.c_str(), size - 1);
+				length = std::min(s.length(), size - 1);
+			}
+
+			return length;
+		}
+
+		size_t PDALGetProj4DataPath(char *path, size_t size)
+		{
+			size_t length = 0;
+
+			if (path && size > 0)
+			{
+				path[0] = '\0';
+				path[size-1] = '\0';
+
+				std::string s = std::getenv("PROJ_LIB");
+				std::strncpy(path, s.c_str(), size - 1);
+				length = std::min(s.length(), size - 1);
+			}
+
+			return length;
+		}
+
+		void PDALSetGdalDataPath(const char *path)
+		{
+			if (path)
+			{
+				setenv("GDAL_DATA", path);
+			}
+		}
+
+		void PDALSetProj4DataPath(const char *path)
+		{
+			if (path)
+			{
+				setenv("PROJ_LIB", path);
+			}
+		}
+
 		size_t PDALFullVersionString(char *version, size_t size)
 		{
 			size_t length = 0;

source/pdal/pdalc_config.h

@@ -23,6 +23,38 @@ namespace pdal
 #else
 #include <stdbool.h>
 #endif
+			/**
+			 * Retrieves the path to the GDAL data directory.
+			 * 
+			 * @param[out] path The buffer used to retrieve the path
+			 * @param size The size of the provided buffer
+			 * @return The size of the retrieved path
+			 */
+			PDALC_API size_t PDALGetGdalDataPath(char *path, size_t size);
+
+			/**
+			 * Retrieves the path to the proj4 data directory.
+			 * 
+			 * @param[out] path The buffer used to retrieve the path
+			 * @param size The size of the provided buffer
+			 * @return The size of the retrieved path
+			 */
+			PDALC_API size_t PDALGetProj4DataPath(char *path, size_t size);
+
+			/**
+			 * Sets the path to the GDAL data directory.
+			 * 
+			 * @oaram path The path to set
+			 */
+			PDALC_API void PDALSetGdalDataPath(const char *path);
+
+			/**
+			 * Sets the path to the proj4 data directory.
+			 * 
+			 * @oaram path The path to set
+			 */
+			PDALC_API void PDALSetProj4DataPath(const char *path);
+
 			/**
 			 * Retrieves the full PDAL version string.
 			 * The full version string includes the major version number, the minor version

tests/pdal/test_pdalc_config.c

@@ -14,6 +14,44 @@
 
 SUITE(test_pdalc_config);
 
+TEST testPDALGetSetGdalDataPath(void)
+{
+	char *original = getenv("GDAL_DATA");
+	char path[1024];
+	size_t size = PDALGetGdalDataPath(path, 1024);
+	ASSERT_STR_EQ(original, path);
+	ASSERT_EQ(strlen(path), size);
+
+	char *expected = "An arbitrary string set as the GDAL data path";
+	PDALSetGdalDataPath(expected);
+	size = PDALGetGdalDataPath(path, 1024);
+	ASSERT_STR_EQ(expected, path);
+	ASSERT_EQ(size, strlen(path));
+
+	PDALSetGdalDataPath(original);
+
+	PASS();
+}
+
+TEST testPDALGetSetProj4DataPath(void)
+{
+	char *original = getenv("PROJ_LIB");
+	char path[1024];
+	size_t size = PDALGetProj4DataPath(path, 1024);
+	ASSERT_STR_EQ(original, path);
+	ASSERT_EQ(size, strlen(path));
+
+	char *expected = "An arbitrary string set as the proj4 data path";
+	PDALSetProj4DataPath(expected);
+	size = PDALGetProj4DataPath(path, 1024);
+	ASSERT_STR_EQ(expected, path);
+	ASSERT_EQ(size, strlen(path));
+
+	PDALSetProj4DataPath(original);
+
+	PASS();
+}
+
 TEST testPDALVersionInfo(void)
 {
 	int versionInteger = PDALVersionInteger();
@@ -86,6 +124,8 @@ TEST testPDALPluginInstallPath(void)
 
 GREATEST_SUITE(test_pdalc_config)
 {
+	RUN_TEST(testPDALGetSetGdalDataPath);
+	RUN_TEST(testPDALGetSetProj4DataPath);
 	RUN_TEST(testPDALVersionInfo);
 	RUN_TEST(testPDALDebugInformation);
 	RUN_TEST(testPDALPluginInstallPath);