116 lines
3.5 KiB
Java
116 lines
3.5 KiB
Java
/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
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/*
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Copyright (c) 2002-2015 ymnk, JCraft,Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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3. The names of the authors may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
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INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package com.jcraft.jsch;
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public class Packet{
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private static Random random=null;
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static void setRandom(Random foo){ random=foo;}
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Buffer buffer;
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byte[] ba4=new byte[4];
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public Packet(Buffer buffer){
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this.buffer=buffer;
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}
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public void reset(){
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buffer.index=5;
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}
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void padding(int bsize){
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int len=buffer.index;
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int pad=(-len)&(bsize-1);
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if(pad<bsize){
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pad+=bsize;
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}
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len=len+pad-4;
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ba4[0]=(byte)(len>>>24);
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ba4[1]=(byte)(len>>>16);
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ba4[2]=(byte)(len>>>8);
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ba4[3]=(byte)(len);
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System.arraycopy(ba4, 0, buffer.buffer, 0, 4);
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buffer.buffer[4]=(byte)pad;
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synchronized(random){
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random.fill(buffer.buffer, buffer.index, pad);
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}
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buffer.skip(pad);
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//buffer.putPad(pad);
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/*
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for(int i=0; i<buffer.index; i++){
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System.err.print(Integer.toHexString(buffer.buffer[i]&0xff)+":");
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}
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System.err.println("");
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*/
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}
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int shift(int len, int bsize, int mac){
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int s=len+5+9;
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int pad=(-s)&(bsize-1);
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if(pad<bsize)pad+=bsize;
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s+=pad;
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s+=mac;
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s+=32; // margin for deflater; deflater may inflate data
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/**/
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if(buffer.buffer.length<s+buffer.index-5-9-len){
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byte[] foo=new byte[s+buffer.index-5-9-len];
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System.arraycopy(buffer.buffer, 0, foo, 0, buffer.buffer.length);
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buffer.buffer=foo;
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}
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/**/
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//if(buffer.buffer.length<len+5+9)
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// System.err.println("buffer.buffer.length="+buffer.buffer.length+" len+5+9="+(len+5+9));
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//if(buffer.buffer.length<s)
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// System.err.println("buffer.buffer.length="+buffer.buffer.length+" s="+(s));
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System.arraycopy(buffer.buffer,
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len+5+9,
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buffer.buffer, s, buffer.index-5-9-len);
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buffer.index=10;
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buffer.putInt(len);
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buffer.index=len+5+9;
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return s;
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}
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void unshift(byte command, int recipient, int s, int len){
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System.arraycopy(buffer.buffer,
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s,
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buffer.buffer, 5+9, len);
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buffer.buffer[5]=command;
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buffer.index=6;
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buffer.putInt(recipient);
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buffer.putInt(len);
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buffer.index=len+5+9;
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}
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Buffer getBuffer(){
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return buffer;
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}
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}
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