org.lealone.plugins.mysql.server.util.StreamUtil Maven / Gradle / Ivy
/*
* Copyright 1999-2012 Alibaba Group.
*
* 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.
*/
package org.lealone.plugins.mysql.server.util;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* @author xianmao.hexm 2011-5-5 下午09:34:11
*/
public final class StreamUtil {
private static final long NULL_LENGTH = -1;
private static final byte[] EMPTY_BYTES = new byte[0];
public static void read(InputStream in, byte[] b, int offset, int length) throws IOException {
for (int got = 0; length > 0;) {
got = in.read(b, offset, length);
if (got < 0) {
throw new EOFException();
}
offset += got;
length -= got;
}
}
public static byte read(InputStream in) throws IOException {
int got = in.read();
if (got < 0) {
throw new EOFException();
}
return (byte) (got & 0xff);
}
public static int readUB2(InputStream in) throws IOException {
byte[] b = new byte[2];
read(in, b, 0, b.length);
int i = b[0] & 0xff;
i |= (b[1] & 0xff) << 8;
return i;
}
public static int readUB3(InputStream in) throws IOException {
byte[] b = new byte[3];
read(in, b, 0, b.length);
int i = b[0] & 0xff;
i |= (b[1] & 0xff) << 8;
i |= (b[2] & 0xff) << 16;
return i;
}
public static int readInt(InputStream in) throws IOException {
byte[] b = new byte[4];
read(in, b, 0, b.length);
int i = b[0] & 0xff;
i |= (b[1] & 0xff) << 8;
i |= (b[2] & 0xff) << 16;
i |= (b[3] & 0xff) << 24;
return i;
}
public static float readFloat(InputStream in) throws IOException {
return Float.intBitsToFloat(readInt(in));
}
public static long readUB4(InputStream in) throws IOException {
byte[] b = new byte[4];
read(in, b, 0, b.length);
long l = b[0] & 0xff;
l |= (long) (b[1] & 0xff) << 8;
l |= (long) (b[2] & 0xff) << 16;
l |= (long) (b[3] & 0xff) << 24;
return l;
}
public static long readLong(InputStream in) throws IOException {
byte[] b = new byte[8];
read(in, b, 0, b.length);
long l = b[0] & 0xff;
l |= (long) (b[1] & 0xff) << 8;
l |= (long) (b[2] & 0xff) << 16;
l |= (long) (b[3] & 0xff) << 24;
l |= (long) (b[4] & 0xff) << 32;
l |= (long) (b[5] & 0xff) << 40;
l |= (long) (b[6] & 0xff) << 48;
l |= (long) (b[7] & 0xff) << 56;
return l;
}
public static double readDouble(InputStream in) throws IOException {
return Double.longBitsToDouble(readLong(in));
}
public static byte[] readWithLength(InputStream in) throws IOException {
int length = (int) readLength(in);
if (length <= 0) {
return EMPTY_BYTES;
}
byte[] b = new byte[length];
read(in, b, 0, b.length);
return b;
}
public static void write(OutputStream out, byte b) throws IOException {
out.write(b & 0xff);
}
public static void writeUB2(OutputStream out, int i) throws IOException {
byte[] b = new byte[2];
b[0] = (byte) (i & 0xff);
b[1] = (byte) (i >>> 8);
out.write(b);
}
public static void writeUB3(OutputStream out, int i) throws IOException {
byte[] b = new byte[3];
b[0] = (byte) (i & 0xff);
b[1] = (byte) (i >>> 8);
b[2] = (byte) (i >>> 16);
out.write(b);
}
public static void writeInt(OutputStream out, int i) throws IOException {
byte[] b = new byte[4];
b[0] = (byte) (i & 0xff);
b[1] = (byte) (i >>> 8);
b[2] = (byte) (i >>> 16);
b[3] = (byte) (i >>> 24);
out.write(b);
}
public static void writeFloat(OutputStream out, float f) throws IOException {
writeInt(out, Float.floatToIntBits(f));
}
public static void writeUB4(OutputStream out, long l) throws IOException {
byte[] b = new byte[4];
b[0] = (byte) (l & 0xff);
b[1] = (byte) (l >>> 8);
b[2] = (byte) (l >>> 16);
b[3] = (byte) (l >>> 24);
out.write(b);
}
public static void writeLong(OutputStream out, long l) throws IOException {
byte[] b = new byte[8];
b[0] = (byte) (l & 0xff);
b[1] = (byte) (l >>> 8);
b[2] = (byte) (l >>> 16);
b[3] = (byte) (l >>> 24);
b[4] = (byte) (l >>> 32);
b[5] = (byte) (l >>> 40);
b[6] = (byte) (l >>> 48);
b[7] = (byte) (l >>> 56);
out.write(b);
}
public static void writeDouble(OutputStream out, double d) throws IOException {
writeLong(out, Double.doubleToLongBits(d));
}
public static long readLength(InputStream in) throws IOException {
int length = in.read();
if (length < 0)
throw new EOFException();
switch (length) {
case 251:
return NULL_LENGTH;
case 252:
return readUB2(in);
case 253:
return readUB3(in);
case 254:
return readLong(in);
default:
return length;
}
}
public static void writeLength(OutputStream out, long length) throws IOException {
if (length < 251) {
out.write((byte) length);
} else if (length < 0x10000L) {
out.write((byte) 252);
writeUB2(out, (int) length);
} else if (length < 0x1000000L) {
out.write((byte) 253);
writeUB3(out, (int) length);
} else {
out.write((byte) 254);
writeLong(out, length);
}
}
public static void writeWithNull(OutputStream out, byte[] src) throws IOException {
out.write(src);
out.write((byte) 0);
}
public static void writeWithLength(OutputStream out, byte[] src) throws IOException {
int length = src.length;
if (length < 251) {
out.write((byte) length);
} else if (length < 0x10000L) {
out.write((byte) 252);
writeUB2(out, length);
} else if (length < 0x1000000L) {
out.write((byte) 253);
writeUB3(out, length);
} else {
out.write((byte) 254);
writeLong(out, length);
}
out.write(src);
}
}
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