com.sshtools.util.TextConversionStream Maven / Gradle / Ivy
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/**
* Copyright 2003-2016 SSHTOOLS Limited. All Rights Reserved.
*
* For product documentation visit https://www.sshtools.com/
*
* This file is part of J2SSH Maverick.
*
* J2SSH Maverick is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* J2SSH Maverick is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with J2SSH Maverick. If not, see
* This class processes text data and corrects line endings according to the
* settings provided. Specifically you can set the input style to process so
* that lone \r and \n characters within a \r\n encoded file are written through
* without amendments (the SFTP protocol states that this must be the case when
* processing text files).
*
*
* @author Lee David Painter
*/
public class TextConversionStream extends FilterOutputStream {
/**
* This output style specifies that the text will have line endings set to
* the current system setting.
*/
public final static int TEXT_SYSTEM = 0;
/**
* This indicates a CRLF line ending combinarion and can be used for both
* input and output style parameters.
*/
public final static int TEXT_WINDOWS = 1;
/**
* This indicates a CRLF line ending combinarion and can be used for both
* input and output style parameters.
*/
public final static int TEXT_DOS = 1;
/*
* This indicates a CRLF line ending combinarion and can be used for both
* input and output style parameters.
*/
public final static int TEXT_CRLF = 1;
/**
* This indicates a LF line ending style and can be used for either input or
* output style parameters
*/
public final static int TEXT_UNIX = 2;
/**
* This indicates a single LF line ending style and can be used for either
* input or output style parameters
*/
public final static int TEXT_LF = 2;
/**
* This indicates a MAC line ending and can be used in either the input or
* output style parameters
*/
public final static int TEXT_MAC = 3;
/**
* This indicates a CR line ending style and can be used for either input or
* output style parameters
*/
public final static int TEXT_CR = 3;
/**
* This input style instructs the conversion to strip all line ending type
* characters and replace with the output style line ending
*/
public final static int TEXT_ALL = 4;
byte[] lineEnding;
String systemNL = System.getProperty("line.separator");
boolean stripCR;
boolean stripLF;
boolean stripCRLF;
boolean encounteredBinary = false;
boolean lastCharacterWasCR = false;
public TextConversionStream(int inputStyle, int outputStyle,
OutputStream out) {
super(out);
switch (inputStyle) {
case TEXT_CRLF: {
stripCR = false;
stripLF = false;
stripCRLF = true;
}
break;
case TEXT_CR: {
stripCR = true;
stripLF = false;
stripCRLF = false;
}
break;
case TEXT_LF: {
stripCR = false;
stripLF = true;
stripCRLF = false;
}
break;
case TEXT_ALL: {
stripCR = true;
stripLF = true;
stripCRLF = true;
}
break;
default: {
throw new IllegalArgumentException("Unknown text style: "
+ outputStyle);
}
}
switch (outputStyle) {
case TEXT_SYSTEM: {
lineEnding = systemNL.getBytes();
}
break;
case TEXT_CRLF: {
lineEnding = new byte[] { (byte) '\r', (byte) '\n' };
}
break;
case TEXT_CR: {
lineEnding = new byte[] { (byte) '\r' };
}
break;
case TEXT_LF: {
lineEnding = new byte[] { (byte) '\n' };
}
break;
case TEXT_ALL: {
throw new IllegalArgumentException(
"TEXT_ALL cannot be used for an output style");
}
default: {
throw new IllegalArgumentException("Unknown text style: "
+ outputStyle);
}
}
}
/**
* Check to see if binary data was encountered during the encoding process
*
* @return boolean
*/
public boolean hasBinary() {
return encounteredBinary;
}
public void write(int b) throws IOException {
write(new byte[] { (byte) b });
}
public void close() throws IOException {
if (lastCharacterWasCR && !stripCR)
out.write('\r');
super.close();
}
/**
*
* @param buf
* byte[]
* @param off
* int
* @param len
* int
* @param out
* OutputStream
* @throws IOException
*/
public void write(byte[] buf, int off, int len) throws IOException {
BufferedInputStream bin = new BufferedInputStream(
new ByteArrayInputStream(buf, off, len), 32768);
int b;
while ((b = bin.read()) != -1) {
if (b == '\r') {
if (stripCRLF) {
bin.mark(1);
int ch = bin.read();
if (ch == -1) {
lastCharacterWasCR = true;
break;
}
if (ch == '\n') {
// This is STYLE_RN do we output as is or replace with
// NL?
out.write(lineEnding);
} else {
// move the stream back and process a single CR
bin.reset();
if (stripCR) {
out.write(lineEnding);
} else
out.write(b);
}
} else {
// This is STYLE_R do we output as is or replace with NL?
if (stripCR)
out.write(lineEnding);
else
out.write(b);
}
} else if (b == '\n') {
// Are we processing between blocks and was the last character a
// CR
if (lastCharacterWasCR) {
out.write(lineEnding);
lastCharacterWasCR = false;
} else {
// This is STYLE_N do we output as is or replace with NL?
if (stripLF)
out.write(lineEnding);
else
out.write(b);
}
} else {
// Check for previous CR in stream
if (lastCharacterWasCR) {
if (stripCR) {
out.write(lineEnding);
} else
out.write(b);
}
// Not an EOL
if (b != 't' && b != '\f' && (b & 0xff) < 32) {
encounteredBinary = true;
}
out.write(b);
}
}
}
public static void main(String[] args) {
try {
TextConversionStream t = new TextConversionStream(TEXT_CRLF,
TEXT_CR, new FileOutputStream("C:\\TEXT.txt"));
t.write("1234567890\r".getBytes());
t.write("\n01234567890\r\n".getBytes());
t.write("\r\n12323445546657".getBytes());
t.write("21344356545656\r".getBytes());
t.close();
} catch (Exception e) {
System.out.println("RECIEVED IOException IN Ssh1Protocol.close:"
+ e.getMessage());
}
}
}