gst/real/: Use GModule instead of using dlsym() directly. Fixes #430598.

Original commit message from CVS:
* gst/real/gstrealaudiodec.c: (gst_real_audio_dec_setcaps),
(gst_real_audio_dec_finalize):
* gst/real/gstrealaudiodec.h:
* gst/real/gstrealvideodec.c: (open_library), (close_library):
* gst/real/gstrealvideodec.h:
Use GModule instead of using dlsym() directly. Fixes #430598.

4 files changed, 85 insertions, 60 deletions

diff --git a/gst/real/gstrealaudiodec.c b/gst/real/gstrealaudiodec.c
index 3dba6512..ff169902 100644
--- a/gst/real/gstrealaudiodec.c
+++ b/gst/real/gstrealaudiodec.c
@@ -1,7 +1,7 @@
 /* GStreamer
  *
  * Copyright (C) 2006 Lutz Mueller <lutz@topfrose.de>
- *		 2006 Edward Hervey <bilboed@bilboed.com>
+ * Copyright (C) 2006 Edward Hervey <bilboed@bilboed.com>
  * 
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -25,7 +25,6 @@
 
 #include "gstrealaudiodec.h"
 
-#include <dlfcn.h>
 #include <string.h>
 
 GST_DEBUG_CATEGORY_STATIC (real_audio_dec_debug);
@@ -115,7 +114,7 @@ struct _GstRealAudioDec
   guint width, height, leaf_size;
 
   /* Hooks */
-  gpointer handle;
+  GModule *module;
   RealFunctions funcs;
 
   /* Used by the REAL library. */
@@ -169,6 +168,9 @@ gst_real_audio_dec_setcaps (GstPad * pad, GstCaps * caps)
 {
   GstRealAudioDec *dec = GST_REAL_AUDIO_DEC (GST_PAD_PARENT (pad));
   GstStructure *s = gst_caps_get_structure (caps, 0);
+  gpointer ra_close_codec, ra_decode, ra_free_decoder;
+  gpointer ra_open_codec2, ra_init_decoder, ra_set_flavor;
+  gpointer set_dll_access_path = NULL, ra_set_pwd = NULL;
   gchar *path;
   gint version, flavor, channels, rate, leaf_size, packet_size, width, height;
   guint16 res;
@@ -177,8 +179,9 @@ gst_real_audio_dec_setcaps (GstPad * pad, GstCaps * caps)
   const GValue *v;
   GstBuffer *buf = NULL;
   const gchar *name = gst_structure_get_name (s);
-  gpointer context = NULL, handle;
-  RealFunctions funcs;
+  GModule *module;
+  gpointer context = NULL;
+  RealFunctions funcs = { NULL, };
 
   if (!strcmp (name, "audio/x-sipro"))
     version = GST_REAL_AUDIO_DEC_VERSION_SIPR;
@@ -218,25 +221,34 @@ gst_real_audio_dec_setcaps (GstPad * pad, GstCaps * caps)
       goto unknown_version;
   }
 
-  handle = dlopen (path, RTLD_LAZY);
-  if (!handle)
+  module = g_module_open (path, G_MODULE_BIND_LAZY);
+
+  if (module == NULL)
     goto could_not_open;
-  funcs.RACloseCodec = dlsym (handle, "RACloseCodec");
-  funcs.RADecode = dlsym (handle, "RADecode");
-  funcs.RAFreeDecoder = dlsym (handle, "RAFreeDecoder");
-  funcs.RAOpenCodec2 = dlsym (handle, "RAOpenCodec2");
-  funcs.RAInitDecoder = dlsym (handle, "RAInitDecoder");
-  funcs.RASetFlavor = dlsym (handle, "RASetFlavor");
-  funcs.SetDLLAccessPath = dlsym (handle, "SetDLLAccessPath");
-  funcs.RASetPwd = dlsym (handle, "RASetPwd");
-  if (!(funcs.RACloseCodec && funcs.RADecode &&
-          funcs.RAFreeDecoder && funcs.RAOpenCodec2 &&
-          funcs.RAInitDecoder && funcs.RASetFlavor))
+
+  if (!g_module_symbol (module, "RACloseCodec", &ra_close_codec) ||
+      !g_module_symbol (module, "RADecode", &ra_decode) ||
+      !g_module_symbol (module, "RAFreeDecoder", &ra_free_decoder) ||
+      !g_module_symbol (module, "RAOpenCodec2", &ra_open_codec2) ||
+      !g_module_symbol (module, "RAInitDecoder", &ra_init_decoder) ||
+      !g_module_symbol (module, "RASetFlavor", &ra_set_flavor)) {
     goto could_not_load;
+  }
+
+  g_module_symbol (module, "RASetPwd", &ra_set_pwd);
 
-  if (funcs.SetDLLAccessPath)
+  if (g_module_symbol (module, "SetDLLAccessPath", &set_dll_access_path))
     funcs.SetDLLAccessPath (DEFAULT_PATH);
 
+  funcs.RACloseCodec = ra_close_codec;
+  funcs.RADecode = ra_decode;
+  funcs.RAFreeDecoder = ra_free_decoder;
+  funcs.RAOpenCodec2 = ra_open_codec2;
+  funcs.RAInitDecoder = ra_init_decoder;
+  funcs.RASetFlavor = ra_set_flavor;
+  funcs.RASetPwd = ra_set_pwd;
+  funcs.SetDLLAccessPath = set_dll_access_path;
+
   if ((res = funcs.RAOpenCodec2 (&context, NULL))) {
     GST_DEBUG_OBJECT (dec, "RAOpenCodec2() failed");
     goto could_not_initialize;
@@ -284,9 +296,9 @@ gst_real_audio_dec_setcaps (GstPad * pad, GstCaps * caps)
     dec->funcs.RAFreeDecoder (dec->context);
   }
   dec->context = context;
-  if (dec->handle)
-    dlclose (dec->handle);
-  dec->handle = handle;
+  if (dec->module)
+    g_module_close (dec->module);
+  dec->module = module;
   dec->funcs = funcs;
 
   return TRUE;
@@ -298,18 +310,19 @@ unknown_version:
   GST_DEBUG_OBJECT (dec, "Cannot handle version %i.", version);
   return FALSE;
 could_not_open:
-  GST_DEBUG_OBJECT (dec, "Could not open library '%s'.", path);
+  GST_DEBUG_OBJECT (dec, "Could not open library '%s': %s", path,
+      g_module_error ());
   return FALSE;
 could_not_load:
-  dlclose (handle);
-  GST_DEBUG_OBJECT (dec, "Could not load all symbols.");
+  g_module_close (module);
+  GST_DEBUG_OBJECT (dec, "Could not load all symbols: %s", g_module_error ());
   return FALSE;
 could_not_initialize:
   if (context) {
     funcs.RACloseCodec (context);
     funcs.RAFreeDecoder (context);
   }
-  dlclose (handle);
+  g_module_close (module);
   GST_DEBUG_OBJECT (dec, "Initialization of REAL driver failed (%i).", res);
   return FALSE;
 could_not_set_caps:
@@ -317,7 +330,7 @@ could_not_set_caps:
     funcs.RACloseCodec (context);
     funcs.RAFreeDecoder (context);
   }
-  dlclose (handle);
+  g_module_close (module);
   GST_DEBUG_OBJECT (dec, "Could not convince peer to accept caps.");
   return FALSE;
 }
@@ -377,9 +390,9 @@ gst_real_audio_dec_finalize (GObject * object)
     /*     dec->funcs.RAFreeDecoder (dec->context); */
     dec->context = NULL;
   }
-  if (dec->handle) {
-    dlclose (dec->handle);
-    dec->handle = NULL;
+  if (dec->module) {
+    g_module_close (dec->module);
+    dec->module = NULL;
   }
 
   if (dec->path_racook) {
diff --git a/gst/real/gstrealaudiodec.h b/gst/real/gstrealaudiodec.h
index b1f68641..3c6769c0 100644
--- a/gst/real/gstrealaudiodec.h
+++ b/gst/real/gstrealaudiodec.h
@@ -25,6 +25,7 @@
 #include <gst/audio/audio.h>
 
 G_BEGIN_DECLS
+
 #define GST_TYPE_REAL_AUDIO_DEC (gst_real_audio_dec_get_type())
 #define GST_REAL_AUDIO_DEC(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_REAL_AUDIO_DEC,GstRealAudioDec))
 #define GST_REAL_AUDIO_DEC_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_REAL_AUDIO_DEC,GstRealAudioDecClass))
@@ -32,9 +33,8 @@ G_BEGIN_DECLS
 typedef struct _GstRealAudioDec GstRealAudioDec;
 typedef struct _GstRealAudioDecClass GstRealAudioDecClass;
 
-GType
-gst_real_audio_dec_get_type (void)
-    G_GNUC_CONST;
+GType gst_real_audio_dec_get_type (void);
 
 G_END_DECLS
+
 #endif /* __GST_REAL_AUDIO_DEC_H__ */
diff --git a/gst/real/gstrealvideodec.c b/gst/real/gstrealvideodec.c
index 0e4c17f1..32b04ea7 100644
--- a/gst/real/gstrealvideodec.c
+++ b/gst/real/gstrealvideodec.c
@@ -1,7 +1,7 @@
 /* RealVideo wrapper plugin
  *
  * Copyright (C) 2005 Lutz Mueller <lutz@topfrose.de>
- *		 2006 Edward Hervey <bilboed@bilboed.com>
+ * Copyright (C) 2006 Edward Hervey <bilboed@bilboed.com>
  * 
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -25,7 +25,6 @@
 
 #include "gstrealvideodec.h"
 
-#include <dlfcn.h>
 #include <string.h>
 
 GST_DEBUG_CATEGORY_STATIC (realvideode_debug);
@@ -626,6 +625,8 @@ static gboolean
 open_library (GstRealVideoDec * dec, GstRealVideoDecHooks * hooks,
     GstRealVideoDecVersion version)
 {
+  gpointer rv_custom_msg, rv_free, rv_init, rv_transform;
+  GModule *module;
   gchar *path = NULL;
 
   GST_DEBUG_OBJECT (dec,
@@ -677,29 +678,34 @@ open_library (GstRealVideoDec * dec, GstRealVideoDecHooks * hooks,
       goto unknown_version;
   }
 
-  hooks->handle = dlopen (path, RTLD_LAZY);
-  if (!hooks->handle)
-    goto could_not_open;
-
-  /* First try opening legacy symbols */
-  hooks->custom_message = dlsym (hooks->handle, "RV20toYUV420CustomMessage");
-  hooks->free = dlsym (hooks->handle, "RV20toYUV420Free");
-  hooks->init = dlsym (hooks->handle, "RV20toYUV420Init");
-  hooks->transform = dlsym (hooks->handle, "RV20toYUV420Transform");
+  GST_LOG_OBJECT (dec, "Trying to open '%s'", path);
+  hooks->module = g_module_open (path, G_MODULE_BIND_LAZY);
 
-  if (!(hooks->custom_message && hooks->free && hooks->init
-          && hooks->transform)) {
-    /* Else try loading new symbols */
-    hooks->custom_message = dlsym (hooks->handle, "RV40toYUV420CustomMessage");
-    hooks->free = dlsym (hooks->handle, "RV40toYUV420Free");
-    hooks->init = dlsym (hooks->handle, "RV40toYUV420Init");
-    hooks->transform = dlsym (hooks->handle, "RV40toYUV420Transform");
+  if (hooks->module == NULL)
+    goto could_not_open;
 
-    if (!(hooks->custom_message && hooks->free && hooks->init
-            && hooks->transform))
-      goto could_not_load;
+  module = hooks->module;
+
+  /* First try opening legacy symbols, if that fails try loading new symbols */
+  if (g_module_symbol (module, "RV20toYUV420Init", &rv_init) &&
+      g_module_symbol (module, "RV20toYUV420Free", &rv_free) &&
+      g_module_symbol (module, "RV20toYUV420Transform", &rv_transform) &&
+      g_module_symbol (module, "RV20toYUV420CustomMessage", &rv_custom_msg)) {
+    GST_LOG_OBJECT (dec, "Loaded legacy symbols");
+  } else if (g_module_symbol (module, "RV40toYUV420Init", &rv_init) &&
+      g_module_symbol (module, "RV40toYUV420Free", &rv_free) &&
+      g_module_symbol (module, "RV40toYUV420Transform", &rv_transform) &&
+      g_module_symbol (module, "RV40toYUV420CustomMessage", &rv_custom_msg)) {
+    GST_LOG_OBJECT (dec, "Loaded new symbols");
+  } else {
+    goto could_not_load;
   }
 
+  hooks->init = rv_init;
+  hooks->free = rv_free;
+  hooks->transform = rv_transform;
+  hooks->custom_message = rv_custom_msg;
+
   return TRUE;
 
 no_known_libraries:
@@ -718,14 +724,15 @@ unknown_version:
 
 could_not_open:
   {
-    GST_ERROR_OBJECT (dec, "Could not open library '%s'.", path);
+    GST_ERROR_OBJECT (dec, "Could not open library '%s':%s", path,
+        g_module_error ());
     return FALSE;
   }
 
 could_not_load:
   {
     close_library (*hooks);
-    GST_ERROR_OBJECT (dec, "Could not load all symbols.");
+    GST_ERROR_OBJECT (dec, "Could not load all symbols: %s", g_module_error ());
     return FALSE;
   }
 }
@@ -736,8 +743,10 @@ close_library (GstRealVideoDecHooks hooks)
   if (hooks.context && hooks.free)
     hooks.free (hooks.context);
 
-  if (hooks.handle)
-    dlclose (hooks.handle);
+  if (hooks.module) {
+    g_module_close (hooks.module);
+    hooks.module = NULL;
+  }
 }
 
 static void
diff --git a/gst/real/gstrealvideodec.h b/gst/real/gstrealvideodec.h
index e7fbbd93..471e29c4 100644
--- a/gst/real/gstrealvideodec.h
+++ b/gst/real/gstrealvideodec.h
@@ -1,7 +1,7 @@
 /* GStreamer
  *
  * Copyright (C) 2006 Lutz Mueller <lutz@topfrose.de>
- *		 2006 Edward Hervey <bilboed@bilbod.com>
+ * Copyright (C) 2006 Edward Hervey <bilboed@bilbod.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ -43,7 +43,7 @@ enum _GstRealVideoDecVersion
 };
 
 typedef struct {
-  gpointer handle;
+  GModule *module;
 
   guint32 (*custom_message) (gpointer, gpointer);
   guint32 (*free) (gpointer);
@@ -91,4 +91,7 @@ struct _GstRealVideoDecClass
 GType gst_real_video_dec_get_type (void);
 
 G_END_DECLS
+
 #endif /* __GST_REAL_VIDEO_DEC_H__ */
+
+