[libbluray-devel] win32: get JRE library location from registry

[hpi1]

libbluray | branch: master | hpi1 <hpi1 at anonymous.org> | Fri Dec 13 20:30:55 2013 +0200| [fc45ef64b518882b3e5820fc9cf874a2931d8b21] | committer: npzacs

win32: get JRE library location from registry

> http://git.videolan.org/gitweb.cgi/libbluray.git/?a=commit;h=fc45ef64b518882b3e5820fc9cf874a2931d8b21
---

 src/libbluray/bdj/bdj.c |   84 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/src/libbluray/bdj/bdj.c b/src/libbluray/bdj/bdj.c
index fdd25c0..7ee0fd2 100644
--- a/src/libbluray/bdj/bdj.c
+++ b/src/libbluray/bdj/bdj.c
@@ -42,8 +42,85 @@
 #include <stdlib.h>
 #include <string.h>
 
+#ifdef _WIN32
+#include <windows.h>
+#include <winreg.h>
+#endif
+
 typedef jint (JNICALL * fptr_JNI_CreateJavaVM) (JavaVM **pvm, void **penv,void *args);
 
+#if defined(_WIN32) && !defined(HAVE_BDJ_J2ME)
+static void *_load_jvm_win32(const char **p_java_home)
+{
+    static const char *java_home = NULL;
+
+    wchar_t buf_loc[4096] = L"SOFTWARE\\JavaSoft\\Java Runtime Environment\\";
+    wchar_t buf_vers[128];
+
+    char strbuf[256];
+
+    LONG r;
+    DWORD lType;
+    DWORD dSize = sizeof(buf_vers);
+    HKEY hkey;
+
+    r = RegOpenKeyExW(HKEY_LOCAL_MACHINE, buf_loc, 0, KEY_READ, &hkey);
+    if (r != ERROR_SUCCESS) {
+        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Error opening registry key SOFTWARE\\JavaSoft\\Java Runtime Environment\\");
+        return NULL;
+    }
+
+    r = RegQueryValueExW(hkey, L"CurrentVersion", NULL, &lType, (LPBYTE)buf_vers, &dSize);
+    RegCloseKey(hkey);
+    if (r != ERROR_SUCCESS) {
+        BD_DEBUG(DBG_BDJ | DBG_CRIT, "CurrentVersion registry value not found");
+        return NULL;
+    }
+
+    if (debug_mask & DBG_BDJ) {
+        WideCharToMultiByte(CP_UTF8, 0, buf_vers, -1, strbuf, sizeof(strbuf), NULL, NULL);
+        BD_DEBUG(DBG_BDJ, "JRE version: %s\n", strbuf);
+    }
+    wcscat(buf_loc, buf_vers);
+
+    dSize = sizeof(buf_loc);
+    r = RegOpenKeyExW(HKEY_LOCAL_MACHINE, buf_loc, 0, KEY_READ, &hkey);
+    if (r != ERROR_SUCCESS) {
+        BD_DEBUG(DBG_BDJ | DBG_CRIT, "Error opening JRE version-specific registry key");
+        return NULL;
+    }
+
+    r = RegQueryValueExW(hkey, L"JavaHome", NULL, &lType, (LPBYTE)buf_loc, &dSize);
+
+    if (r == ERROR_SUCCESS) {
+        /* do not fail even if not found */
+        WideCharToMultiByte(CP_UTF8, 0, buf_loc, -1, strbuf, sizeof(strbuf), NULL, NULL);
+        *p_java_home = java_home = str_dup(strbuf);
+        BD_DEBUG(DBG_BDJ, "JavaHome: %s\n", strbuf);
+    }
+
+    dSize = sizeof(buf_loc);
+    r = RegQueryValueExW(hkey, L"RuntimeLib", NULL, &lType, (LPBYTE)buf_loc, &dSize);
+    RegCloseKey(hkey);
+
+    if (r != ERROR_SUCCESS) {
+        BD_DEBUG(DBG_BDJ | DBG_CRIT, "RuntimeLib registry value not found");
+        return NULL;
+    }
+
+    void *result = LoadLibraryW(buf_loc);
+
+    WideCharToMultiByte(CP_UTF8, 0, buf_loc, -1, strbuf, sizeof(strbuf), NULL, NULL);
+    if (!result) {
+        BD_DEBUG(DBG_BDJ | DBG_CRIT, "can't open library '%s'\n", strbuf);
+    } else {
+        BD_DEBUG(DBG_BDJ, "Using JRE library %s\n", strbuf);
+    }
+
+    return result;
+}
+#endif
+
 static void *_jvm_dlopen(const char *java_home, const char *jvm_dir, const char *jvm_lib)
 {
     if (java_home) {
@@ -92,6 +169,13 @@ static void *_load_jvm(const char **p_java_home)
         return _jvm_dlopen(java_home, jvm_dir, jvm_lib);
     }
 
+#if defined(_WIN32) && !defined(HAVE_BDJ_J2ME)
+    handle = _load_jvm_win32(p_java_home);
+    if (handle) {
+        return handle;
+    }
+#endif
+
     BD_DEBUG(DBG_BDJ | DBG_CRIT, "JAVA_HOME not set, trying default locations\n");
 
     /* try our pre-defined locations */