From 3a9c7749797697fd0943dd27810eb286c4d7a2ed Mon Sep 17 00:00:00 2001
From: Vic Lee <llyzs@163.com>
Date: Fri, 8 Jul 2011 14:28:52 +0800
Subject: [PATCH] libfreerdp-utils: add load_plugin module.

---
 CMakeLists.txt                      |  3 ++
 include/freerdp/utils/load_plugin.h | 25 ++++++++++
 libfreerdp-utils/CMakeLists.txt     |  3 ++
 libfreerdp-utils/load_plugin.c      | 74 +++++++++++++++++++++++++++++
 4 files changed, 105 insertions(+)
 create mode 100644 include/freerdp/utils/load_plugin.h
 create mode 100644 libfreerdp-utils/load_plugin.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index de2c6b8d3..464d00503 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,6 +56,9 @@ test_big_endian(BIG_ENDIAN)
 # Path to put keymaps
 set(FREERDP_KEYMAP_PATH "${CMAKE_INSTALL_PREFIX}/freerdp/keymaps")
 
+# Path to put plugins
+set(FREERDP_PLUGIN_PATH "${CMAKE_INSTALL_PREFIX}/lib/freerdp")
+
 # Include directories
 include_directories(${CMAKE_SOURCE_DIR})
 include_directories(${CMAKE_SOURCE_DIR}/include)
diff --git a/include/freerdp/utils/load_plugin.h b/include/freerdp/utils/load_plugin.h
new file mode 100644
index 000000000..a06c16959
--- /dev/null
+++ b/include/freerdp/utils/load_plugin.h
@@ -0,0 +1,25 @@
+/**
+ * FreeRDP: A Remote Desktop Protocol Client
+ * Plugin Loading Utils
+ *
+ * Copyright 2011 Vic Lee
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __LOAD_PLUGIN_UTILS_H
+#define __LOAD_PLUGIN_UTILS_H
+
+void* freerdp_load_plugin(const char* name, const char* entry_name);
+
+#endif /* __LOAD_PLUGIN_UTILS_H */
diff --git a/libfreerdp-utils/CMakeLists.txt b/libfreerdp-utils/CMakeLists.txt
index ad482dcc7..f8ad0d8c4 100644
--- a/libfreerdp-utils/CMakeLists.txt
+++ b/libfreerdp-utils/CMakeLists.txt
@@ -20,12 +20,15 @@
 set(FREERDP_UTILS_SRCS
 	blob.c
 	hexdump.c
+	load_plugin.c
 	memory.c
 	mutex.c
 	semaphore.c
 	stream.c
 	unicode.c)
 
+add_definitions(-DPLUGIN_PATH="${FREERDP_PLUGIN_PATH}")
+
 add_library(freerdp-utils SHARED ${FREERDP_UTILS_SRCS})
 
 set_target_properties(freerdp-utils PROPERTIES VERSION ${FREERDP_VERSION_FULL} SOVERSION ${FREERDP_VERSION})
diff --git a/libfreerdp-utils/load_plugin.c b/libfreerdp-utils/load_plugin.c
new file mode 100644
index 000000000..350d78841
--- /dev/null
+++ b/libfreerdp-utils/load_plugin.c
@@ -0,0 +1,74 @@
+/**
+ * FreeRDP: A Remote Desktop Protocol Client
+ * Plugin Loading Utils
+ *
+ * Copyright 2011 Vic Lee
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <freerdp/utils/load_plugin.h>
+
+#ifdef _WIN32
+
+#include <windows.h>
+#define DLOPEN(f) LoadLibrary(f)
+#define DLSYM(f, n) GetProcAddress(f, n)
+#define DLCLOSE(f) FreeLibrary(f)
+#define PATH_SEPARATOR '\\'
+#define PLUGIN_EXT "dll"
+
+#else
+
+#include <dlfcn.h>
+#include <unistd.h>
+#define DLOPEN(f) dlopen(f, RTLD_LOCAL | RTLD_LAZY)
+#define DLSYM(f, n) dlsym(f, n)
+#define DLCLOSE(f) dlclose(f)
+#define PATH_SEPARATOR '/'
+#define PLUGIN_EXT "so"
+
+#endif
+
+void* freerdp_load_plugin(const char* name, const char* entry_name)
+{
+	char path[255];
+	void* module;
+	void* entry;
+
+	if (strchr(name, PATH_SEPARATOR) == NULL)
+	{
+		snprintf(path, sizeof(path), PLUGIN_PATH "%c%s." PLUGIN_EXT, PATH_SEPARATOR, name);
+	}
+	else
+	{
+		strncpy(path, name, sizeof(path));
+	}
+
+	module = DLOPEN(path);
+	if (module == NULL)
+	{
+		printf("freerdp_load_plugin: failed to open %s.\n", path);
+		return NULL;
+	}
+	entry = DLSYM(module, entry_name);
+	if (entry == NULL)
+	{
+		printf("freerdp_load_plugin: failed to load %s.\n", path);
+		return NULL;
+	}
+	return entry;
+}