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/* -*- 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
#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);
}
}