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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.nio.BufferOverflowException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.CharBuffer;
import java.nio.DoubleBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.LongBuffer;
import java.nio.ShortBuffer;
public class Main {
public static void main(String[] args) {
ByteBuffer buf = ByteBuffer.allocateDirect(16);
System.out.println("Direct byte buffer has array: " + buf.hasArray());
intFloatTest();
basicShortTest();
primTest();
}
/*
* Create a buffer and fiddle with it.
*/
public static void basicShortTest() {
ByteBuffer directBuf = ByteBuffer.allocateDirect(64);
//ByteBuffer directBuf = ByteBuffer.allocateDirect(65);
ShortBuffer shortBuf = directBuf.asShortBuffer();
short[] myShorts = {
1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007,
1008, 1009, 1010, 1011, 1012, 1013, 1014, 1015,
1016, 1017, 1018, 1019, 1020, 1021, 1022, 1023,
1024, 1025, 1026, 1027, 1028, 1029, 1030, 1031
};
shortBuf.position(0);
shortBuf.put(myShorts, 0, 32); // should work
shortBuf.position(0);
shortBuf.put(myShorts, 16, 16); // should work
shortBuf.put(myShorts, 16, 16); // advance to end
try {
shortBuf.put(myShorts, 0, 1); // should fail
System.err.println("ERROR: out-of-bounds put succeeded\n");
} catch (BufferOverflowException boe) {
System.out.println("Got expected buffer overflow exception");
}
try {
shortBuf.position(0);
shortBuf.put(myShorts, 0, 33); // should fail
System.err.println("ERROR: out-of-bounds put succeeded\n");
} catch (IndexOutOfBoundsException ioobe) {
System.out.println("Got expected out-of-bounds exception");
}
try {
shortBuf.position(16);
shortBuf.put(myShorts, 0, 17); // should fail
System.err.println("ERROR: out-of-bounds put succeeded\n");
} catch (BufferOverflowException boe) {
System.out.println("Got expected buffer overflow exception");
}
}
/*
* Try this with either floats or ints; ints fail with
* BufferOverflowException, floats work.
*
* From http://code.google.com/p/android/issues/detail?id=1585 .
*/
public static void intFloatTest() {
ByteBuffer direct = ByteBuffer.allocateDirect(100);
direct.order(ByteOrder.nativeOrder());
IntBuffer int1 = direct.asIntBuffer();
int data[] = new int[25];
//FloatBuffer int1 = direct.asFloatBuffer();
//float data[] = new float[25];
int1.clear ();
int1.put (data);
int1.position (0);
int1.clear ();
int1.put (data);
int1.position (0);
}
/*
* Exercise all "view buffer" classes, in both byte orders.
*/
public static void primTest() {
ByteBuffer directBuf = ByteBuffer.allocateDirect(36);
directBuf.order(ByteOrder.BIG_ENDIAN);
storeValues(directBuf);
for (int i = 0; i < 36; i++) {
directBuf.put(i, (byte) 0xcc);
}
directBuf.order(ByteOrder.LITTLE_ENDIAN);
storeValues(directBuf);
}
static void storeValues(ByteBuffer directBuf) {
directBuf.position(0);
ShortBuffer shortBuf = directBuf.asShortBuffer();
CharBuffer charBuf = directBuf.asCharBuffer();
IntBuffer intBuf = directBuf.asIntBuffer();
FloatBuffer floatBuf = directBuf.asFloatBuffer();
LongBuffer longBuf = directBuf.asLongBuffer();
DoubleBuffer doubleBuf = directBuf.asDoubleBuffer();
final byte byteValue = -5;
final short shortValue = -1234;
final char charValue = 49200;
final int intValue = 0x12345678;
final float floatValue = 3.14159f;
final long longValue = 0x1122334455667788L;
final double doubleValue = Double.MIN_VALUE;
if (directBuf.put(1, byteValue).get(1) != byteValue) {
throw new RuntimeException("byte get/store failed");
}
if (shortBuf.put(1, shortValue).get(1) != shortValue) {
throw new RuntimeException("short get/store failed");
}
if (charBuf.put(2, charValue).get(2) != charValue) {
throw new RuntimeException("char get/store failed");
}
if (intBuf.put(2, intValue).get(2) != intValue) {
throw new RuntimeException("int get/store failed");
}
if (floatBuf.put(3, floatValue).get(3) != floatValue) {
throw new RuntimeException("float get/store failed");
}
if (longBuf.put(2, longValue).get(2) != longValue) {
throw new RuntimeException("long get/store failed");
}
if (doubleBuf.put(3, doubleValue).get(3) != doubleValue) {
throw new RuntimeException("double get/store failed");
}
directBuf.position(0);
char[] outBuf = new char[directBuf.limit() * 2];
for (int i = 0; i < directBuf.limit(); i++) {
byte b = directBuf.get();
outBuf[i*2] = hexChar((byte) ((b >> 4) & 0x0f));
outBuf[i*2+1] = hexChar((byte) (b & 0x0f));
}
System.out.println(new String(outBuf));
}
static char hexChar(byte b) {
if (b < 10) {
return (char) ('0' + b);
} else {
return (char) ('a' + b - 10);
}
}
}
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