1 /* BlockOutputStream.java -- 2 Copyright (C) 2003, 2004 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package gnu.java.net.protocol.ftp; 40 41 import java.io.IOException; 42 import java.io.OutputStream; 43 44 /** 45 * A DTP output stream that implements the FTP block transfer mode. 46 * 47 * @author Chris Burdess (dog@gnu.org) 48 */ 49 class BlockOutputStream 50 extends DTPOutputStream 51 { 52 53 static final byte RECORD = -128; // 0x80 54 static final byte EOF = 64; // 0x40 55 BlockOutputStream(DTP dtp, OutputStream out)56 BlockOutputStream(DTP dtp, OutputStream out) 57 { 58 super(dtp, out); 59 } 60 write(int c)61 public void write(int c) 62 throws IOException 63 { 64 if (transferComplete) 65 { 66 return; 67 } 68 byte[] buf = new byte[] 69 { 70 RECORD, /* record descriptor */ 71 0x00, 0x01, /* one byte */ 72 (byte) c /* the byte */ 73 }; 74 out.write(buf, 0, 4); 75 } 76 write(byte[] b)77 public void write(byte[] b) 78 throws IOException 79 { 80 write(b, 0, b.length); 81 } 82 write(byte[] b, int off, int len)83 public void write(byte[] b, int off, int len) 84 throws IOException 85 { 86 if (transferComplete) 87 { 88 return; 89 } 90 byte[] buf = new byte[len + 3]; 91 buf[0] = RECORD; /* record descriptor */ 92 buf[1] = (byte) ((len & 0x00ff) >> 8); /* high byte of bytecount */ 93 buf[2] = (byte) (len & 0xff00); /* low byte of bytecount */ 94 System.arraycopy(b, off, buf, 3, len); 95 out.write(buf, 0, len); 96 } 97 close()98 public void close() 99 throws IOException 100 { 101 byte[] buf = new byte[] 102 { 103 EOF, /* eof descriptor */ 104 0x00, 0x00 /* no bytes */ 105 }; 106 out.write(buf, 0, 3); 107 super.close(); 108 } 109 110 } 111