package cn.org.hentai.jtt1078.util;
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import java.util.Arrays;
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/**
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* Created by matrixy on 2018-06-15.
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*/
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public class ByteHolder
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{
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int offset = 0;
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int size = 0;
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byte[] buffer = null;
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public ByteHolder(int bufferSize)
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{
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System.out.print("ByteHolder(bufferSize:"+bufferSize+")");
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this.buffer = new byte[bufferSize];
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}
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public int size()
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{
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return this.size;
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}
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public void write(byte[] data)
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{
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write(data, 0, data.length);
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}
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public void write(byte[] data, int offset, int length)
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{
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while (this.offset + length >= buffer.length)
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throw new RuntimeException(String.format("exceed the max buffer size, max length: %d, data length: %d", buffer.length, length));
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// 复制一下内容
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System.arraycopy(data, offset, buffer, this.offset, length);
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this.offset += length;
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this.size += length;
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}
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public byte[] array()
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{
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return array(this.size);
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}
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public byte[] array(int length)
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{
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return Arrays.copyOf(this.buffer, length);
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}
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public void write(byte b)
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{
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this.buffer[offset++] = b;
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this.size += 1;
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}
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public void sliceInto(byte[] dest, int length)
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{
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//System.out.println();
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System.arraycopy(this.buffer, 0, dest, 0, length);
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// 往前挪length个位
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System.arraycopy(this.buffer, length, this.buffer, 0, this.size - length);
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this.offset -= length;
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this.size -= length;
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}
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public void slice(int length)
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{
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// 往前挪length个位
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System.arraycopy(this.buffer, length, this.buffer, 0, this.size - length);
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this.offset -= length;
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this.size -= length;
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}
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public byte get(int position)
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{
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return this.buffer[position];
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}
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public void clear()
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{
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this.offset = 0;
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this.size = 0;
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}
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public int getInt(int offset)
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{
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return ByteUtils.getInt(this.buffer, offset, 4);
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}
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public int getShort(int position)
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{
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int h = this.buffer[position] & 0xff;
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int l = this.buffer[position + 1] & 0xff;
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return ((h << 8) | l) & 0xffff;
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}
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}
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