1 files changed, 117 insertions, 0 deletions
diff --git a/gfx/gl/GLLibraryLoader.cpp b/gfx/gl/GLLibraryLoader.cpp
new file mode 100644
index 000000000..801ffe37c
--- /dev/null
+++ b/gfx/gl/GLLibraryLoader.cpp
@@ -0,0 +1,117 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GLLibraryLoader.h"
+
+#include "nsDebug.h"
+
+#ifdef WIN32
+#include <windows.h>
+#endif
+
+namespace mozilla {
+namespace gl {
+
+bool
+GLLibraryLoader::OpenLibrary(const char* library)
+{
+    PRLibSpec lspec;
+    lspec.type = PR_LibSpec_Pathname;
+    lspec.value.pathname = library;
+
+    mLibrary = PR_LoadLibraryWithFlags(lspec, PR_LD_LAZY | PR_LD_LOCAL);
+    if (!mLibrary)
+        return false;
+
+    return true;
+}
+
+bool
+GLLibraryLoader::LoadSymbols(const SymLoadStruct* firstStruct,
+                             bool tryplatform,
+                             const char* prefix,
+                             bool warnOnFailure)
+{
+    return LoadSymbols(mLibrary,
+                       firstStruct,
+                       tryplatform ? mLookupFunc : nullptr,
+                       prefix,
+                       warnOnFailure);
+}
+
+PRFuncPtr
+GLLibraryLoader::LookupSymbol(PRLibrary* lib,
+                              const char* sym,
+                              PlatformLookupFunction lookupFunction)
+{
+    PRFuncPtr res = 0;
+
+    // try finding it in the library directly, if we have one
+    if (lib) {
+        res = PR_FindFunctionSymbol(lib, sym);
+    }
+
+    // then try looking it up via the lookup symbol
+    if (!res && lookupFunction) {
+        res = lookupFunction(sym);
+    }
+
+    // finally just try finding it in the process
+    if (!res) {
+        PRLibrary* leakedLibRef;
+        res = PR_FindFunctionSymbolAndLibrary(sym, &leakedLibRef);
+    }
+
+    return res;
+}
+
+bool
+GLLibraryLoader::LoadSymbols(PRLibrary* lib,
+                             const SymLoadStruct* firstStruct,
+                             PlatformLookupFunction lookupFunction,
+                             const char* prefix,
+                             bool warnOnFailure)
+{
+    char sbuf[MAX_SYMBOL_LENGTH * 2];
+    int failCount = 0;
+
+    const SymLoadStruct* ss = firstStruct;
+    while (ss->symPointer) {
+        *ss->symPointer = 0;
+
+        for (int i = 0; i < MAX_SYMBOL_NAMES; i++) {
+            if (ss->symNames[i] == nullptr)
+                break;
+
+            const char* s = ss->symNames[i];
+            if (prefix && *prefix != 0) {
+                strcpy(sbuf, prefix);
+                strcat(sbuf, ss->symNames[i]);
+                s = sbuf;
+            }
+
+            PRFuncPtr p = LookupSymbol(lib, s, lookupFunction);
+            if (p) {
+                *ss->symPointer = p;
+                break;
+            }
+        }
+
+        if (*ss->symPointer == 0) {
+            if (warnOnFailure) {
+                printf_stderr("Can't find symbol '%s'.\n", ss->symNames[0]);
+            }
+
+            failCount++;
+        }
+
+        ss++;
+    }
+
+    return failCount == 0 ? true : false;
+}
+
+} /* namespace gl */
+} /* namespace mozilla */
+