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Mica net is a net framework.
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Copyright 2020 t-io
Licensed under the Apache License, Version 2.0 (the "License");
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package org.tio.utils.hutool;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.Objects;
/**
* 代码移植自blade
* 快速缓冲，将数据存放在缓冲集中，取代以往的单一数组
*
* @author biezhi、looly、L.cm
* @since 1.0
*/
public class FastByteBuffer {
/**
* 一个缓冲区的最小字节数
*/
private final int minChunkLen;
/**
* 缓冲集
*/
private byte[][] buffers = new byte[16][];
/**
* 缓冲数
*/
private int buffersCount;
/**
* 当前缓冲索引
*/
private int currentBufferIndex = -1;
/**
* 当前缓冲
*/
private byte[] currentBuffer;
/**
* 当前缓冲偏移量
*/
private int offset;
/**
* 缓冲字节数
*/
private int size;
public FastByteBuffer() {
this.minChunkLen = 1024;
}
public FastByteBuffer(int size) {
this.minChunkLen = Math.abs(size);
}
/**
* 分配下一个缓冲区，不会小于1024
*
* @param newSize 理想缓冲区字节数
*/
private void needNewBuffer(int newSize) {
int delta = newSize - size;
int newBufferSize = Math.max(minChunkLen, delta);
currentBufferIndex++;
currentBuffer = new byte[newBufferSize];
offset = 0;
// add buffer
if (currentBufferIndex >= buffers.length) {
int newLen = buffers.length << 1;
byte[][] newBuffers = new byte[newLen][];
System.arraycopy(buffers, 0, newBuffers, 0, buffers.length);
buffers = newBuffers;
}
buffers[currentBufferIndex] = currentBuffer;
buffersCount++;
}
/**
* 向快速缓冲加入数据
*
* @param array 数据
* @param off 偏移量
* @param len 字节数
* @return 快速缓冲自身 @see FastByteBuffer
*/
public FastByteBuffer append(byte[] array, int off, int len) {
int end = off + len;
if ((off < 0) || (len < 0) || (end > array.length)) {
throw new IndexOutOfBoundsException();
}
if (len == 0) {
return this;
}
int newSize = size + len;
int remaining = len;
if (currentBuffer != null) {
// first try to fill current buffer
int part = Math.min(remaining, currentBuffer.length - offset);
System.arraycopy(array, end - remaining, currentBuffer, offset, part);
remaining -= part;
offset += part;
size += part;
}
if (remaining > 0) {
// still some data left
// ask for new buffer
needNewBuffer(newSize);
// then copy remaining
// but this time we are sure that it will fit
int part = Math.min(remaining, currentBuffer.length - offset);
System.arraycopy(array, end - remaining, currentBuffer, offset, part);
offset += part;
size += part;
}
return this;
}
/**
* 向快速缓冲加入数据
*
* @param buffer 数据
* @return 快速缓冲自身 @see FastByteBuffer
*/
public FastByteBuffer append(ByteBuffer buffer) {
return append(buffer.array());
}
/**
* 向快速缓冲加入数据
*
* @param array 数据
* @return 快速缓冲自身 @see FastByteBuffer
*/
public FastByteBuffer append(byte[] array) {
return append(array, 0, array.length);
}
/**
* 向快速缓冲加入一个字节
*
* @param element 一个字节的数据
* @return 快速缓冲自身 @see FastByteBuffer
*/
public FastByteBuffer append(byte element) {
if ((currentBuffer == null) || (offset == currentBuffer.length)) {
needNewBuffer(size + 1);
}
currentBuffer[offset] = element;
offset++;
size++;
return this;
}
/**
* 将另一个快速缓冲加入到自身
*
* @param buff 快速缓冲
* @return 快速缓冲自身 @see FastByteBuffer
*/
public FastByteBuffer append(FastByteBuffer buff) {
if (buff.size == 0) {
return this;
}
for (int i = 0; i < buff.currentBufferIndex; i++) {
append(buff.buffers[i]);
}
append(buff.currentBuffer, 0, buff.offset);
return this;
}
/**
* 写出一个 boolean 值，true 为 1，false 为 0
*
* @param value boolean value
* @return FastByteBuffer
*/
public FastByteBuffer writeBoolean(boolean value) {
return writeByte(value ? 1 : 0);
}
/**
* 写出一个byte类型的数据
*
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeByte(int value) {
return this.append((byte) value);
}
/**
* 写出 short，大端模式
*
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeShortBE(int value) {
byte[] bytes = new byte[2];
bytes[0] = (byte) (value >>> 8);
bytes[1] = (byte) (value);
return this.append(bytes, 0, 2);
}
/**
* 写出 short，小端模式
*
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeShortLE(int value) {
byte[] bytes = new byte[2];
bytes[0] = (byte) (value);
bytes[1] = (byte) (value >>> 8);
return this.append(bytes, 0, 2);
}
/**
* 写出 3 个字节，大端模式
*
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeMediumBE(int value) {
byte[] bytes = new byte[3];
bytes[0] = (byte) (value >>> 16);
bytes[1] = (byte) (value >>> 8);
bytes[2] = (byte) (value);
return this.append(bytes, 0, 3);
}
/**
* 写出 3 个字节，小端模式
*
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeMediumLE(int value) {
byte[] bytes = new byte[3];
bytes[0] = (byte) (value);
bytes[1] = (byte) (value >>> 8);
bytes[2] = (byte) (value >>> 16);
return this.append(bytes, 0, 3);
}
/**
* 写出 4 个字节，大端模式
*
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeIntBE(long value) {
byte[] bytes = new byte[4];
bytes[0] = (byte) (value >>> 24);
bytes[1] = (byte) (value >>> 16);
bytes[2] = (byte) (value >>> 8);
bytes[3] = (byte) (value);
return this.append(bytes, 0, 4);
}
/**
* 写出 4 个字节，小端模式
*
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeIntLE(long value) {
byte[] bytes = new byte[4];
bytes[0] = (byte) (value);
bytes[1] = (byte) (value >>> 8);
bytes[2] = (byte) (value >>> 16);
bytes[3] = (byte) (value >>> 24);
return this.append(bytes, 0, 4);
}
/**
* 写出 8 个字节，大端模式
*
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeLongBE(long value) {
byte[] bytes = new byte[8];
bytes[0] = (byte) (value >>> 56);
bytes[1] = (byte) (value >>> 48);
bytes[2] = (byte) (value >>> 40);
bytes[3] = (byte) (value >>> 32);
bytes[4] = (byte) (value >>> 24);
bytes[5] = (byte) (value >>> 16);
bytes[6] = (byte) (value >>> 8);
bytes[7] = (byte) value;
return this.append(bytes, 0, 8);
}
/**
* 写出 8 个字节，小端模式
*
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeLongLE(long value) {
byte[] bytes = new byte[8];
bytes[0] = (byte) value;
bytes[1] = (byte) (value >>> 8);
bytes[2] = (byte) (value >>> 16);
bytes[3] = (byte) (value >>> 24);
bytes[4] = (byte) (value >>> 32);
bytes[5] = (byte) (value >>> 40);
bytes[6] = (byte) (value >>> 48);
bytes[7] = (byte) (value >>> 56);
return this.append(bytes, 0, 8);
}
/**
* 写出单精度浮点
*
* @param value value
* @return FastByteBuffer
*/
public FastByteBuffer writeFloatBE(float value) {
return writeIntBE(Float.floatToRawIntBits(value));
}
/**
* 写出单精度浮点
*
* @param value value
* @return FastByteBuffer
*/
public FastByteBuffer writeFloatLE(float value) {
return writeIntLE(Float.floatToRawIntBits(value));
}
/**
* 写出双精度浮点
*
* @param value value
* @return FastByteBuffer
*/
public FastByteBuffer writeDoubleBE(double value) {
return writeLongBE(Double.doubleToRawLongBits(value));
}
/**
* 写出双精度浮点
*
* @param value value
* @return FastByteBuffer
*/
public FastByteBuffer writeDoubleLE(double value) {
return writeLongLE(Double.doubleToRawLongBits(value));
}
/**
* 写出一个bytes类型的数据
*
* @param bytes 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer writeBytes(byte[] bytes) {
return this.append(bytes, 0, bytes.length);
}
/**
* 写出一个bytes类型的数据
*
* @param bytes 待写出数值
* @param off off
* @param len len
* @return FastByteBuffer
*/
public FastByteBuffer writeBytes(byte[] bytes, int off, int len) {
return this.append(bytes, off, len);
}
/**
* 写可变长度整数
*
* @param num num
* @return FastByteBuffer
*/
public FastByteBuffer writeVarLengthInt(int num) {
do {
int digit = num % 128;
num /= 128;
if (num > 0) {
digit |= 0x80;
}
this.append((byte) digit);
} while (num > 0);
return this;
}
/**
* 写出文本
*
* @param text 文本
*/
public void writeString(String text) {
writeString(text, StandardCharsets.UTF_8);
}
/**
* 写出文本
*
* @param text 文本
* @param charset charset
*/
public void writeString(String text, String charset) {
writeString(text, Charset.forName(charset));
}
/**
* 写出文本
*
* @param text 文本
* @param charset charset
*/
public void writeString(String text, Charset charset) {
append(Objects.requireNonNull(text).getBytes(charset));
}
/**
* 设定指定位置的字节
*
* @param index index
* @param value value
* @return FastByteBuffer
*/
public FastByteBuffer setByte(int index, int value) {
if ((index >= size) || (index < 0)) {
throw new IndexOutOfBoundsException();
}
int ndx = 0;
while (true) {
byte[] b = buffers[ndx];
if (index < b.length) {
b[index] = (byte) value;
return this;
}
ndx++;
index -= b.length;
}
}
/**
* 设置 boolean 值，true 为 1，false 为 0
*
* @param index index
* @param value boolean value
* @return FastByteBuffer
*/
public FastByteBuffer setBoolean(int index, boolean value) {
return setByte(index, value ? 1 : 0);
}
/**
* 写出 short，大端模式
*
* @param index index
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer setShortBE(int index, int value) {
byte[] bytes = new byte[2];
bytes[0] = (byte) (value >>> 8);
bytes[1] = (byte) (value);
return this.setBytes(index, bytes, 0, 2);
}
/**
* 写出 short，小端模式
*
* @param index index
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer setShortLE(int index, int value) {
byte[] bytes = new byte[2];
bytes[0] = (byte) (value);
bytes[1] = (byte) (value >>> 8);
return this.setBytes(index, bytes, 0, 2);
}
/**
* 写出 3 个字节，大端模式
*
* @param index index
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer setMediumBE(int index, int value) {
byte[] bytes = new byte[3];
bytes[0] = (byte) (value >>> 16);
bytes[1] = (byte) (value >>> 8);
bytes[2] = (byte) (value);
return this.setBytes(index, bytes, 0, 3);
}
/**
* 写出 3 个字节，小端模式
*
* @param index index
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer setMediumLE(int index, int value) {
byte[] bytes = new byte[3];
bytes[0] = (byte) (value);
bytes[1] = (byte) (value >>> 8);
bytes[2] = (byte) (value >>> 16);
return this.setBytes(index, bytes, 0, 3);
}
/**
* 写出 4 个字节，大端模式
*
* @param index index
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer setIntBE(int index, long value) {
byte[] bytes = new byte[4];
bytes[0] = (byte) (value >>> 24);
bytes[1] = (byte) (value >>> 16);
bytes[2] = (byte) (value >>> 8);
bytes[3] = (byte) (value);
return this.setBytes(index, bytes, 0, 4);
}
/**
* 写出 4 个字节，小端模式
*
* @param index index
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer setIntLE(int index, long value) {
byte[] bytes = new byte[4];
bytes[0] = (byte) (value);
bytes[1] = (byte) (value >>> 8);
bytes[2] = (byte) (value >>> 16);
bytes[3] = (byte) (value >>> 24);
return this.setBytes(index, bytes, 0, 4);
}
/**
* 写出 8 个字节，大端模式
*
* @param index index
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer setLongBE(int index, long value) {
byte[] bytes = new byte[8];
bytes[0] = (byte) (value >>> 56);
bytes[1] = (byte) (value >>> 48);
bytes[2] = (byte) (value >>> 40);
bytes[3] = (byte) (value >>> 32);
bytes[4] = (byte) (value >>> 24);
bytes[5] = (byte) (value >>> 16);
bytes[6] = (byte) (value >>> 8);
bytes[7] = (byte) value;
return this.setBytes(index, bytes, 0, 8);
}
/**
* 写出 8 个字节，小端模式
*
* @param index index
* @param value 待写出数值
* @return FastByteBuffer
*/
public FastByteBuffer setLongLE(int index, long value) {
byte[] bytes = new byte[8];
bytes[0] = (byte) value;
bytes[1] = (byte) (value >>> 8);
bytes[2] = (byte) (value >>> 16);
bytes[3] = (byte) (value >>> 24);
bytes[4] = (byte) (value >>> 32);
bytes[5] = (byte) (value >>> 40);
bytes[6] = (byte) (value >>> 48);
bytes[7] = (byte) (value >>> 56);
return this.setBytes(index, bytes, 0, 8);
}
/**
* 写出单精度浮点
*
* @param index index
* @param value value
* @return FastByteBuffer
*/
public FastByteBuffer setFloatBE(int index, float value) {
return setIntBE(index, Float.floatToRawIntBits(value));
}
/**
* 写出单精度浮点
*
* @param index index
* @param value value
* @return FastByteBuffer
*/
public FastByteBuffer setFloatLE(int index, float value) {
return setIntLE(index, Float.floatToRawIntBits(value));
}
/**
* 写出双精度浮点
*
* @param index index
* @param value value
* @return FastByteBuffer
*/
public FastByteBuffer setDoubleBE(int index, double value) {
return setLongBE(index, Double.doubleToRawLongBits(value));
}
/**
* 写出双精度浮点
*
* @param index index
* @param value value
* @return FastByteBuffer
*/
public FastByteBuffer setDoubleLE(int index, double value) {
return setLongLE(index, Double.doubleToRawLongBits(value));
}
/**
* 设置指定 index 的 byte
*
* @param index index
* @param src src
* @return FastByteBuffer
*/
public FastByteBuffer setBytes(int index, byte[] src) {
return setBytes(index, src, 0, src.length);
}
/**
* 设置字节
*
* @param index index
* @param src src
* @param srcIndex srcIndex
* @param length length
* @return FastByteBuffer
*/
public FastByteBuffer setBytes(int index, byte[] src, int srcIndex, int length) {
if ((index >= size) || (index < 0)) {
throw new IndexOutOfBoundsException();
}
int ndx = 0;
while (true) {
byte[] buffer = buffers[ndx];
int bufferLength = buffer.length;
index = Math.max(index, 0);
if (index < bufferLength) {
if ((index + length) < bufferLength) {
System.arraycopy(src, srcIndex, buffer, index, length);
return this;
} else {
System.arraycopy(src, srcIndex, buffer, index, bufferLength - index);
length = index + length - bufferLength;
}
}
ndx++;
index -= bufferLength;
}
}
public int size() {
return size;
}
public boolean isEmpty() {
return size == 0;
}
/**
* 当前缓冲位于缓冲区的索引位
*
* @return {@link #currentBufferIndex}
*/
public int index() {
return currentBufferIndex;
}
public int offset() {
return offset;
}
/**
* 根据索引位返回缓冲集中的缓冲
*
* @param index 索引位
* @return 缓冲
*/
public byte[] array(int index) {
return buffers[index];
}
/**
* 重置，用于复用
*
* @return FastByteBuffer
*/
public FastByteBuffer reset() {
size = 0;
offset = 0;
currentBufferIndex = -1;
currentBuffer = null;
buffersCount = 0;
return this;
}
/**
* 返回快速缓冲中的数据
*
* @return 快速缓冲中的数据
*/
public byte[] toArray() {
int pos = 0;
byte[] array = new byte[size];
if (currentBufferIndex == -1) {
return array;
}
for (int i = 0; i < currentBufferIndex; i++) {
int len = buffers[i].length;
System.arraycopy(buffers[i], 0, array, pos, len);
pos += len;
}
System.arraycopy(buffers[currentBufferIndex], 0, array, pos, offset);
return array;
}
/**
* 返回快速缓冲中的数据
*
* @param start 逻辑起始位置
* @param len 逻辑字节长
* @return 快速缓冲中的数据
*/
public byte[] toArray(int start, int len) {
int remaining = len;
int pos = 0;
byte[] array = new byte[len];
if (len == 0) {
return array;
}
int i = 0;
while (start >= buffers[i].length) {
start -= buffers[i].length;
i++;
}
while (i < buffersCount) {
byte[] buf = buffers[i];
int c = Math.min(buf.length - start, remaining);
System.arraycopy(buf, start, array, pos, c);
pos += c;
remaining -= c;
if (remaining == 0) {
break;
}
start = 0;
i++;
}
return array;
}
/**
* 转换成数组
*
* @return ByteBuffer
*/
public ByteBuffer toBuffer() {
return ByteBuffer.wrap(this.toArray());
}
/**
* 根据索引位返回一个字节
*
* @param index 索引位
* @return 一个字节
*/
public byte get(int index) {
if ((index >= size) || (index < 0)) {
throw new IndexOutOfBoundsException();
}
int ndx = 0;
while (true) {
byte[] b = buffers[ndx];
if (index < b.length) {
return b[index];
}
ndx++;
index -= b.length;
}
}
}