Add java.nio.Buffer helper methods.
Bug: 124338141
Test: Boot and observe no core platform api warnings from opengl
(cherry picked from commit f5480bdcdd27e492a9858599664c74e16a46a961)
Change-Id: I4680418398f0708c26c0124b418a2ccb1094a038
Merged-In: I6db85f6084dd620e08568dbdeea0d10efb20a84f
diff --git a/include/nativehelper/JNIHelp.h b/include/nativehelper/JNIHelp.h
index 3076678..bab5dd5 100644
--- a/include/nativehelper/JNIHelp.h
+++ b/include/nativehelper/JNIHelp.h
@@ -122,6 +122,48 @@
MODULE_API jlong jniGetOwnerIdFromFileDescriptor(C_JNIEnv* env, jobject fileDescriptor);
/*
+ * Gets the managed heap array backing a java.nio.Buffer instance.
+ *
+ * Returns nullptr if there is no array backing.
+ *
+ * This method performs a JNI call to java.nio.NIOAccess.getBaseArray().
+ */
+MODULE_API jarray jniGetNioBufferBaseArray(C_JNIEnv* env, jobject nioBuffer);
+
+/*
+ * Gets the offset in bytes from the start of the managed heap array backing the buffer.
+ *
+ * Returns 0 if there is no array backing.
+ *
+ * This method performs a JNI call to java.nio.NIOAccess.getBaseArrayOffset().
+ */
+MODULE_API jint jniGetNioBufferBaseArrayOffset(C_JNIEnv* env, jobject nioBuffer);
+
+/*
+ * Gets field information from a java.nio.Buffer instance.
+ *
+ * Reads the |position|, |limit|, and |elementSizeShift| fields from the buffer instance.
+ *
+ * Returns the |address| field of the java.nio.Buffer instance which is only valid (non-zero) when
+ * the buffer is backed by a direct buffer.
+ */
+MODULE_API jlong jniGetNioBufferFields(C_JNIEnv* env,
+ jobject nioBuffer,
+ /*out*/jint* position,
+ /*out*/jint* limit,
+ /*out*/jint* elementSizeShift);
+
+/*
+ * Gets the current position from a java.nio.Buffer as a pointer to memory in a fixed buffer.
+ *
+ * Returns 0 if |nioBuffer| is not backed by a direct buffer.
+ *
+ * This method reads the |address|, |position|, and |elementSizeShift| fields from the
+ * java.nio.Buffer instance to calculate the pointer address for the current position.
+ */
+MODULE_API jlong jniGetNioBufferPointer(C_JNIEnv* env, jobject nioBuffer);
+
+/*
* Returns the reference from a java.lang.ref.Reference.
*/
MODULE_API jobject jniGetReferent(C_JNIEnv* env, jobject ref);
@@ -196,6 +238,24 @@
return jniGetOwnerIdFromFileDescriptor(&env->functions, fileDescriptor);
}
+inline jarray jniGetNioBufferBaseArray(JNIEnv* env, jobject nioBuffer) {
+ return jniGetNioBufferBaseArray(&env->functions, nioBuffer);
+}
+
+inline jint jniGetNioBufferBaseArrayOffset(JNIEnv* env, jobject nioBuffer) {
+ return jniGetNioBufferBaseArrayOffset(&env->functions, nioBuffer);
+}
+
+inline jlong jniGetNioBufferFields(JNIEnv* env, jobject nioBuffer,
+ jint* position, jint* limit, jint* elementSizeShift) {
+ return jniGetNioBufferFields(&env->functions, nioBuffer,
+ position, limit, elementSizeShift);
+}
+
+inline jlong jniGetNioBufferPointer(JNIEnv* env, jobject nioBuffer) {
+ return jniGetNioBufferPointer(&env->functions, nioBuffer);
+}
+
inline jobject jniGetReferent(JNIEnv* env, jobject ref) {
return jniGetReferent(&env->functions, ref);
}