1 files changed, 80 insertions, 0 deletions
diff --git a/mozglue/android/SharedMemNatives.cpp b/mozglue/android/SharedMemNatives.cpp
new file mode 100644
index 0000000000..f38a2274b3
--- /dev/null
+++ b/mozglue/android/SharedMemNatives.cpp
@@ -0,0 +1,80 @@
+/* -*- Mode: c++; c-basic-offset: 2; tab-width: 20; indent-tabs-mode: nil; -*-
+ * 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 <errno.h>
+#include <jni.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include "mozilla/Sprintf.h"
+
+extern "C" {
+
+JNIEXPORT
+void JNICALL
+Java_org_mozilla_gecko_media_SampleBuffer_nativeReadFromDirectBuffer(
+    JNIEnv* jenv, jclass, jobject src, jlong dest, jint offset, jint size) {
+  uint8_t* from = static_cast<uint8_t*>(jenv->GetDirectBufferAddress(src));
+  if (from == nullptr) {
+    jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+                   "Null direct buffer");
+    return;
+  }
+
+  void* to = reinterpret_cast<void*>(dest);
+  if (to == nullptr) {
+    jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+                   "Null shared memory buffer");
+    return;
+  }
+
+  memcpy(to, from + offset, size);
+}
+
+JNIEXPORT
+void JNICALL
+Java_org_mozilla_gecko_media_SampleBuffer_nativeWriteToDirectBuffer(
+    JNIEnv* jenv, jclass, jlong src, jobject dest, jint offset, jint size) {
+  uint8_t* from = reinterpret_cast<uint8_t*>(src);
+  if (from == nullptr) {
+    jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+                   "Null shared memory buffer");
+    return;
+  }
+
+  void* to = jenv->GetDirectBufferAddress(dest);
+  if (to == nullptr) {
+    jenv->ThrowNew(jenv->FindClass("java/lang/NullPointerException"),
+                   "Null direct buffer");
+    return;
+  }
+
+  memcpy(to, from + offset, size);
+}
+
+JNIEXPORT
+jlong JNICALL Java_org_mozilla_gecko_mozglue_SharedMemory_map(JNIEnv* env,
+                                                              jobject jobj,
+                                                              jint fd,
+                                                              jint length) {
+  void* address = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+  if (address == MAP_FAILED) {
+    char msg[128];
+    SprintfLiteral(msg, "mmap failed. errno=%d", errno);
+    env->ThrowNew(env->FindClass("java/lang/NullPointerException"), msg);
+    return 0;
+  }
+  return jlong(address);
+}
+
+JNIEXPORT
+void JNICALL Java_org_mozilla_gecko_mozglue_SharedMemory_unmap(JNIEnv* env,
+                                                               jobject jobj,
+                                                               jlong address,
+                                                               jint size) {
+  munmap((void*)address, (size_t)size);
+}
+}