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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
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src/main/java/org/gjt/convert/binhex/BinHex4InputStream.java Executable file
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/*
JBinHex
Copyright (C) 2000, Erwin Bolwidt <ejb@klomp.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package org.gjt.convert.binhex;
import java.util.*;
import java.io.*;
/**
This class completely decodes a BinHex4 file in three parts: the header,
the data fork and the resource fork.
By default, all the InputStream-derived methods work on the data fork. With
the methods <code>useDataFork</code> and <code>useResourceFork</code> the caller
can select from which fork this stream will read. However, because this stream
obtains the BinHex4 file through a stream, one can only read the forks in the
order that they are in the BinHex4 file, which is: first the data fork, then
the resource fork. A future version of this class that obtains it's data from
a RandomAccessFile may be able to switch to reading from data and resource
fork at any time.
<p>
Lacks something that translates between Unicode and the Mac character
set to deal with foreign characters in filenames, types and creators.
Anyone who has such a thing under a GPL license is invited to send it to me.
@author Erwin Bolwidt
*/
public class BinHex4InputStream extends InputStream {
private final static int stateBeforeHeader = 0;
private final static int stateInDataFork = 1;
private final static int stateInResourceFork = 2;
private final static int stateError = 3;
/**
Representation of a BinHex4 header section.
*/
public static class Header
{
/**
The name that this file had before encoding in BinHex4. The bytes
represent characters in the Macintosh character set.
*/
byte[] fileName;
/**
The version of this file. Usually 0. This is a special feature of
the Macintosh file system that is, to my knowledge, infrequently
used.
*/
int version;
/**
Four bytes containing the file type. The bytes represent
characters in the Macintosh character set.
*/
byte[] type;
/**
Four bytes containing the creator type. The bytes represent
characters in the Macintosh character set.
*/
byte[] creator;
/**
Macintosh file system file info flags
*/
int flags;
/**
Length of the data fork.<p>
A java long even though it's only 32 bits in the file because I
don't know if it's signed or unsigned in the file.
*/
long dataLength;
/**
Length of the resource fork.<p>
A java long even though it's only 32 bits in the file because I
don't know if it's signed or unsigned in the file.
*/
long resourceLength;
/**
Reads a header from a completely 8-bit clean BinHex4-Hqx8 stream.
(No RLE coding allowed)
*/
public Header(InputStream in) throws IOException
{
int szFileName = in.read();
if(szFileName == -1)
throw new EOFException("In Hqx header");
fileName = new byte[szFileName];
if(in.read(fileName) != szFileName)
throw new EOFException("In Hqx header");
version = in.read();
if(version == -1)
throw new EOFException("In Hqx header");
type = new byte[4];
if(in.read(type) != 4)
throw new EOFException("In Hqx header");
creator = new byte[4];
if(in.read(creator) != 4)
throw new EOFException("In Hqx header");
flags = read16bits(in);
dataLength = read32bits(in);
resourceLength = read32bits(in);
}
/**
Returns the name this file had before encoding in BinHex.
<p>
Since I've found no trace of a Macintosh character set converted
to/from Unicode, this method converts using the locale-default
character converter. This will usually only work well if your
character set is ASCII for character codes 0-127.
If anyone can send a converter for Mac characters to Unicode, I'll
put that in here.
*/
public String getFileName()
{
return new String(fileName);
}
/**
Returns the type that this file had before encoding in BinHex.
<p>
Since I've found no trace of a Macintosh character set converted
to/from Unicode, this method converts using the locale-default
character converter. This will usually only work well if your
character set is ASCII for character codes 0-127.
If anyone can send a converter for Mac characters to Unicode, I'll
put that in here.
*/
public String getType()
{
return new String(type);
}
/**
Returns the creator that this file had before encoding in BinHex.
<p>
Since I've found no trace of a Macintosh character set converted
to/from Unicode, this method converts using the locale-default
character converter. This will usually only work well if your
character set is ASCII for character codes 0-127.
If anyone can send a converter for Mac characters to Unicode, I'll
put that in here.
*/
public String getCreator()
{
return new String(creator);
}
/**
Returns the version that this file had before encoding in BinHex.
*/
public int getVersion()
{
return version;
}
/**
Returns the file info flags that this file had before encoding in BinHex.
*/
public int getFlags()
{
return flags;
}
/**
Returns the length of the data fork.
*/
public long getDataLength()
{
return dataLength;
}
/**
Returns the length of the resource fork.
*/
public long getResourceLength()
{
return resourceLength;
}
/**
Returns the content of this header in a single informational String.
*/
public String toString()
{
return "BinHex4InputStream.Header[\nfileName = " + new String(fileName)
+ "\nversion = " + version + "\ntype = " + new String(type)
+ "\ncreator = " + new String(creator) + "\nflags = " + flags
+ "\ndataLength = " + dataLength + "\nresourceLength = " + resourceLength
+ "\n]";
}
}
/**
Constructs a BinHex4InputStream from a stream that is a source of 7-bit
Hqx7 encoded data. This is the typical use for files fetched from the
Internet or through e-mail.
*/
public BinHex4InputStream(InputStream source)
{
hqxIn = new RLE_CRCInputStream(source);
}
/**
Constructs a BinHex4InputStream from a stream that is either a source
of 7-bit Hqx7 encoded data or of pure 8-bit data in Hqx8 format. The
flag eightBit tells this class what to expect.
@param source
the data source
@param eightBit
if true, the data source must supply 8-bit data in Hqx8 format.
If false, the data source must supply 7-bit data in Hqx7 format.
*/
public BinHex4InputStream(InputStream source, boolean eightBit)
{
hqxIn = new RLE_CRCInputStream(source, eightBit);
}
/**
Returns the header section of this BinHex file in a Header object.
*/
public Header getHeader() throws IOException
{
if(header == null)
readHeader();
return header;
}
private void readHeader() throws IOException
{
try {
if(streamState != stateBeforeHeader)
throw new IOException("Wrong stream state, cannot read the header now.");
hqxIn.resetCRC();
header = new Header(hqxIn);
checkDataCRC();
switchState(stateInDataFork);
} catch(IOException e)
{
switchState(stateError);
throw e;
}
}
private void switchState(int newState)
{
if((header == null && newState != stateError) || streamState == stateError)
throw new IllegalStateException(
"Cannot switch state with header == null or in errorState");
if(newState == stateInDataFork)
{
bytesLeftInFork = header.dataLength;
hqxIn.resetCRC();
hardEndOfFork = false;
seenEndOfFork = false;
}
else if(newState == stateInResourceFork)
{
bytesLeftInFork = header.resourceLength;
hqxIn.resetCRC();
hardEndOfFork = false;
seenEndOfFork = false;
}
streamState = newState;
}
/**
Switch reading from the data fork. All methods derived from InputStream
will apply to the data fork. This method cannot be called after any
method has thrown an IOException, or after useResourceFork has been called.
*/
public void useDataFork() throws IOException
{
if(streamState == stateError)
throw new IOException("Stream is already in error state");
else if(streamState == stateBeforeHeader)
readHeader();
else if(streamState == stateInResourceFork)
throw new IOException(
"Sorry, no random access. Cannot switch back from "
+ "resource to data fork.");
else if(streamState != stateInDataFork)
throw new IllegalStateException("Stream is in unknown state.");
}
/**
Swtich to reading from the resource fork. All methods derived from
InputStream will apply to the resource fork. This method cannot be
called after any method has thrown an IOException.
*/
public void useResourceFork() throws IOException
{
if(streamState == stateError)
throw new IOException("Stream is already in error state");
else if(streamState == stateBeforeHeader)
readHeader();
if(streamState == stateInDataFork)
{
skipToEndOfFork();
switchState(stateInResourceFork);
}
else if(streamState != stateInResourceFork)
throw new IllegalStateException("Stream is in unexpected state.");
}
public int read() throws IOException
{
if(streamState == stateBeforeHeader)
useDataFork();
if(seenEndOfFork)
{
// If this method is called a second time AFTER a -1, the
// caller must know for itself and be ready to get an EOFException.
// So set seenEOF to false again, and nextDecodedByte will throw
// one of these.
seenEndOfFork = false;
return -1;
} else if(hardEndOfFork)
throw new EOFException("End of fork");
if(bytesLeftInFork == 0)
{
hardEndOfFork = true;
return -1;
}
int b = hqxIn.read();
if(b == -1)
throw new EOFException("Physical end-of-file before end of fork");
bytesLeftInFork--;
if(bytesLeftInFork == 0)
{
// The fork was completely read, now check the fork's CRC
checkDataCRC();
}
return b;
}
public int read(byte[] b) throws IOException
{
return read(b, 0, b.length);
}
public int read(byte[] b, int off, int len) throws IOException
{
if(seenEndOfFork)
{
// If this method is called a second time AFTER a -1, the
// caller must know for itself and be ready to get an EOFException.
// So set seenEOF to false again, and nextDecodedByte will throw
// one of these.
seenEndOfFork = false;
return -1;
} else if(hardEndOfFork)
throw new EOFException("End of fork");
if(bytesLeftInFork == 0)
{
hardEndOfFork = true;
return -1;
}
if(len == 0)
return 0;
int toRead = (len > bytesLeftInFork) ? (int)bytesLeftInFork : len;
int r = hqxIn.read(b, off, toRead);
if(r <= 0)
throw new EOFException("Physical end-of-file before end of fork");
bytesLeftInFork -= r;
if(bytesLeftInFork <= 0)
{
// The fork was completely read, now check the fork's CRC
checkDataCRC();
}
return r;
}
private void checkDataCRC() throws IOException
{
int calculatedCRC = hqxIn.getCRC();
int readCRC = read16bits(hqxIn);
if(calculatedCRC != readCRC)
throw new IOException("Incorrect CRC (calculated:"+calculatedCRC+" != file:"+readCRC+")");
}
private void skipToEndOfFork() throws IOException
{
skip(bytesLeftInFork);
}
private static long read32bits(InputStream in) throws IOException
{
long res = 0;
for(int i = 0; i < 4; i++)
{
int v = in.read();
if(v == -1)
throw new EOFException("Unexpected");
res = (res << 8) | v;
}
return res;
}
private static int read16bits(InputStream in) throws IOException
{
int fl1 = in.read();
if(fl1 == -1)
throw new EOFException("Unexpected");
int fl2 = in.read();
if(fl2 == -1)
throw new EOFException("Unexpected");
return (fl1 << 8) | fl2;
}
public static void main(String[] args)
{
try {
BinHex4InputStream in = new BinHex4InputStream(System.in);
System.err.println(in.getHeader());
byte[] buf = new byte[1024];
System.err.println("Starting to convert");
while(true)
{
int r = in.read(buf);
if(r <= 0)
return;
System.out.write(buf, 0, r);
}
} catch(IOException e)
{
e.printStackTrace();
}
}
/**
One of three states: before header, in data fork, or in resource fork.
*/
private int streamState = stateBeforeHeader;
/**
How many bytes are left to read in the current fork; only valid when
streamState != beforeHeader
*/
private long bytesLeftInFork;
/**
The header of the BinHex4 file; only available when streamState != beforeHeader
*/
private Header header;
/**
The input stream, conveniently cast to type RLE_CRCInputStream so the CRC
related methods can be easily called.
*/
private RLE_CRCInputStream hqxIn;
/**
read(byte[]) sets this if it cannot return -1 immediately. Read calls
must return -1 and set this flag to false when they find this flag true.
*/
private boolean seenEndOfFork;
/**
Hard end of fork. If somebody reads from this stream after they've been
returned a -1, which means seenEndOfFork == false and hardEndOfFork == true,
then they get an EOFException.
*/
private boolean hardEndOfFork;
}

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/*
JBinHex
Copyright (C) 2000, Erwin Bolwidt <ejb@klomp.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package org.gjt.convert.binhex;
import java.util.*;
import java.io.*;
import java.net.*;
/**
Command line program to decode binhex files from the harddisk or from
the web.
It accepts the following command line parameters:</P>
<MENU>
<LI>Either <CODE>-u &lt;url&gt;</CODE> or <CODE>-f &lt;file&gt;</CODE>
to specify the source BinHexed file. If neither of those options
is present, <CODE>DeBinHex</CODE> reads <CODE>stdin</CODE>.
<LI><CODE>-d</CODE> to decode the data fork. It will be put in
the file with the name that came from the BinHex header.
<LI><CODE>-df &lt;filename&gt;</CODE> to decode the data fork
to the named file instead of the name that came from the BinHex
header.
<LI><CODE>-r</CODE> to decode the resource fork. It will be put
in the file with the name that came from the BinHex header, with
the extension &quot;<CODE>.resource</CODE>&quot; appended to
it.
<LI><CODE>-rf &lt;filename&gt;</CODE> to decode the resource
fork to the named file instead of the name that came from the
BinHex header.
<LI>Both <CODE>-d</CODE>/<CODE>-df</CODE> options and <CODE>-r</CODE>/<CODE>-rf</CODE>
may be present at the same time. If none of these options is
present, <CODE>DeBinHex</CODE> will decode the data fork as if
the <CODE>-d</CODE> options was specified.
<LI><CODE>-h</CODE> to only show the header of the BinHex file
on <CODE>stdout</CODE>. The decoding options are ignored.
</MENU>
@author Erwin Bolwidt
*/
public class DeBinHex
{
public static void main(String[] args) throws Exception
{
String inFile = findValueOption("-f", args);
InputStream binhexIn = System.in;
if(inFile != null)
binhexIn = new FileInputStream(inFile);
else
{
String urlString = findValueOption("-u", args);
if(urlString != null)
{
URL url = new URL(urlString);
binhexIn = url.openConnection().getInputStream();
}
}
if(findOption("-h", args))
{
action(binhexIn, true, false, null, false, null);
return;
}
String dataFile = null;
String resourceFile = null;
boolean doData = false;
boolean doResource = false;
if((dataFile = findValueOption("-df", args)) != null)
doData = true;
if(findOption("-d", args))
doData = true;
if((resourceFile = findValueOption("-rf", args)) != null)
doResource = true;
if(findOption("-r", args))
doResource = true;
if(!doResource && !doData)
// The user didn't specify anything to do, so let's do the data
// fork.
doData = true;
action(binhexIn, false, doData, dataFile, doResource, resourceFile);
}
private static String findValueOption(String name, String[] args)
{
for(int i = 0; i < args.length; i++)
{
if(args[i].equals(name))
{
if(i + 1 < args.length)
return args[i+1];
else
throw new RuntimeException(
"Cannot use option that needs an argument "
+ "as the last option");
}
}
return null;
}
private static boolean findOption(String name, String[] args)
{
for(int i = 0; i < args.length; i++)
{
if(args[i].equals(name))
return true;
}
return false;
}
public static void action(
InputStream binhexIn, boolean justHeader,
boolean doData, String dataOut,
boolean doResource, String resourceOut) throws IOException
{
BinHex4InputStream binhex;
binhex = new BinHex4InputStream(binhexIn);
if(justHeader)
{
System.out.println(binhex.getHeader());
return;
}
String fileName = binhex.getHeader().getFileName();
if(doData && dataOut == null)
dataOut = fileName;
if(doResource && resourceOut == null)
resourceOut = fileName.concat(".resource");
if(doData)
{
FileOutputStream out = new FileOutputStream(dataOut);
try {
pump(binhex, out);
} finally {
out.close();
}
}
if(doResource)
{
FileOutputStream out = new FileOutputStream(resourceOut);
binhex.useResourceFork();
try {
pump(binhex, out);
} finally {
out.close();
}
}
}
private static void pump(InputStream in, OutputStream out) throws IOException
{
byte[] buf = new byte[1024];
while(true)
{
int r = in.read(buf);
if(r <= 0)
return;
out.write(buf, 0, r);
}
}
}

363
src/main/java/org/gjt/convert/binhex/Hqx7_to_Hqx8InputStream.java Executable file
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/*
JBinHex
Copyright (C) 2000, Erwin Bolwidt <ejb@klomp.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package org.gjt.convert.binhex;
import java.util.*;
import java.io.*;
/**
Converts a 7-bit encoded binhex4.0 data stream to a 8-bit encoded
data stream. The 8-bit stream still needs to be split in a data and
a resource fork, and still needs to have any Run-Length Encoded (RLE)
sequences expanded.
<p>
This class does not (yet) support segmented files. It
is however very liberal about whitespace: any is allowed. So you could cat
all segmented files together and remove the "--- end of part NN ---" and
the beginning-of-next-part identifier "---" lines from the resulting file
before decoding.
@author Erwin Bolwidt
*/
public class Hqx7_to_Hqx8InputStream extends FilterInputStream {
final static String validChars
= "!\"#$%&'()*+,-012345689@ABCDEFGHIJKLMNPQRSTUVXYZ[`"
+ "abcdefhijklmpqr";
final static String binhexHeaderId = "(This file must be converted with BinHex";
/**
Although encoded in 7-bit, each value only represents 6 bits. This
is because not all 7-bit values can be used since they may have special
meanings to the underlying transport mechanism. Compare Hqx7 with Base64,
they have the same design goals although Base64 probably achieves them
better.
*/
final static byte[] sixBitTable = new byte[256];
final static byte invalidEntry = (byte)64;
/**
The size of the streambuffer. Could be anything that's not too small.
Bigger sizes probably improve performance, up to a point.
*/
final static int sz_streamBuf = 1024;
/**
Initializes six-bit table from the validChars string.
*/
static {
// An assertion to see if nobody mistakenly changed the validChars
// string. This whole class wouldn't work if they had.
if(validChars.length() != 64)
throw new IllegalStateException(
"Incorrect class, the static validChars entry should "
+ "be 64 characters long.");
for(int i = 0; i < sixBitTable.length; i++)
{
// 64 is the 'invalid character' value
sixBitTable[i] = invalidEntry;
}
// Now give every valid character the 6-bit
for(int i = 0, l = validChars.length(); i < l; i++)
{
sixBitTable[validChars.charAt(i)] = (byte)i;
}
}
/**
Constructs a Hqx7_to_Hqx8InputStream that reads from the supplied source
and converts that source to 8-bit Hqx8 without RLE expansion.
*/
public Hqx7_to_Hqx8InputStream(InputStream source)
{
super(source);
}
private void skipHeader() throws IOException
{
int b, c = nextStreamByte();
while(true)
{
for(int i = 0, l = binhexHeaderId.length(); c != -1; c = nextStreamByte(), i++)
{
if(i == l) {
skipHeaderAfterId();
return;
}
if(c != binhexHeaderId.charAt(i))
// Try again at the next line.
break;
}
if(c == -1)
throw new EOFException("Couldn't find start of Hqx7 part");
do {
b = nextStreamByte();
if(b == -1)
throw new EOFException("Couldn't find start of Hqx7 part");
} while(b != '\n' && b != '\r');
c = nextStreamByte();
// Allow MS-DOS type linebreaks too
if(c == '\n' && b == '\r')
c = nextStreamByte();
}
}
private void skipHeaderAfterId() throws IOException
{
int b;
do {
b = nextStreamByte();
if(b == -1)
throw new EOFException("Couldn't find start of Hqx7 part");
} while(b != '\n' && b != '\r');
do {
b = nextStreamByte();
if(b == -1)
throw new EOFException("Couldn't find start of Hqx7 part");
} while(b != ':' && Character.isWhitespace((char)b));
if(b != ':')
throw new EOFException("Invalid start of Hqx7 part, no : right after id line");
}
/**
Internal method to get the next physical byte from the superclass
stream, while keeping buffering consistent.
@return
the byte that was read, or -1 if end-of-file was encountered for
the first time. Any subsequent read throws an EOFException.
@exception EOFException
thrown when this method is called after it returned -1 once.
*/
private int nextStreamByte() throws IOException
{
if(sbFilled == -1)
throw new EOFException("End of file already reached.");
if(sbIndex < sbFilled)
{
// Debug line
// System.err.print((char)streamBuffer[sbIndex]);
// Take care to return no sign-extended numbers, hence the & 0xff
return ((int)streamBuffer[sbIndex++]) & 0xff;
}
sbFilled = super.read(streamBuffer, 0, streamBuffer.length);
if(sbFilled <= 0)
{
sbFilled = -1;
// Debug line
// new Exception().printStackTrace();
return sbFilled;
}
sbIndex = 0;
// Debug line
// System.err.print((char)streamBuffer[sbIndex]);
// Take care to return no sign-extended numbers, hence the & 0xff
return ((int)streamBuffer[sbIndex++]) & 0xff;
}
private int next6bits() throws IOException
{
if(hardEOF)
throw new EOFException(
"All Hqx7 data was read and a soft EOF was already "
+ "reported with a -1 return to read().");
int b;
do {
b = nextStreamByte();
// True end-of-file is not allowed, a Hqx7 always ends earlier
// with a : character.
if(b == -1)
throw new EOFException(
"EOF reached before closing : character. "
+ "Possible data corruption.");
// The high bit could have been used as a parity bit. Better be sure.
b &= 0x7f;
// The : character terminates the stream
if(b == ':') {
hardEOF = true;
return -1;
}
} while(Character.isWhitespace((char)b));
int v = sixBitTable[b];
if(v == invalidEntry)
throw new IOException(
"Illegal character in Hqx7 stream encountered, "
+ "possible data corruption. ('" + (char)b + "')");
return v;
}
private int nextDecodedByte() throws IOException
{
while(bitsLeft < 8)
{
int bits = next6bits();
if(bits == -1)
return -1;
bitBuffer = (bitBuffer << 6) | bits;
bitsLeft += 6;
}
// Taking 8 bits out.
bitsLeft -= 8;
// Incidentally, the bitBuffer value also needs a shift of the number
// of bits left after taking 8 bits out.
return (bitBuffer >>> bitsLeft) & 0xff;
}
public int read() throws IOException
{
if(!headerDone)
{
skipHeader();
headerDone = true;
}
if(seenEOF)
{
// If this method is called a second time AFTER a -1, the
// caller must know for itself and be ready to get an EOFException.
// So set seenEOF to false again, and nextDecodedByte will throw
// one of these.
seenEOF = false;
return -1;
}
return nextDecodedByte();
}
public int read(byte[] b) throws IOException
{
return read(b, 0, b.length);
}
public int read(byte[] b, int off, int len) throws IOException
{
if(!headerDone)
{
skipHeader();
headerDone = true;
}
if(seenEOF)
{
// If this method is called a second time AFTER a -1, the
// caller must know for itself and be ready to get an EOFException.
// So set seenEOF to false again, and nextDecodedByte will throw
// one of these.
seenEOF = false;
return -1;
}
for(int i = off, max = off+len; i < max; i++)
{
int t = nextDecodedByte();
if(t == -1) {
if(i == off)
// No data read yet, so safe to return -1
return -1;
seenEOF = true;
return i - off;
}
b[i] = (byte)t;
}
return len;
}
public static void main(String[] args)
{
try {
InputStream in = new Hqx7_to_Hqx8InputStream(System.in);
byte[] buf = new byte[1024];
System.err.println("Starting to convert");
while(true)
{
int r = in.read(buf);
if(r <= 0)
return;
System.out.write(buf, 0, r);
}
} catch(IOException e)
{
e.printStackTrace();
}
}
/**
A buffer for a maximum of two times six bits.
*/
private int bitBuffer;
/**
How many bits are left in the bitBuffer.
*/
private int bitsLeft;
/**
Bytes that were read from the stream but not all yet processed.
*/
private byte[] streamBuffer = new byte[sz_streamBuf];
/**
The next byte in the stream buffer to process.
*/
private int sbIndex = 0;
/**
How many bytes in the buffer are stream data; the buffer could
be longer than that.
*/
private int sbFilled = 0;
/**
The read(byte[], int, int) call cannot immediately signal eof with a -1
when it sees it, since it may already have read some data. So it sets
this flag, which it checks the next time it is called.
*/
private boolean seenEOF = false;
/**
This flag is set by next6bits after it's seen a : delimiter. Any time
thereafter that next6bits is called, it will throw EOFException.
*/
private boolean hardEOF = false;
/**
This flag is true when the header has been read
*/
private boolean headerDone = false;
}

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src/main/java/org/gjt/convert/binhex/RLE_CRCInputStream.java Executable file
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/*
JBinHex
Copyright (C) 2000, Erwin Bolwidt <ejb@klomp.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package org.gjt.convert.binhex;
import java.util.*;
import java.io.*;
/**
Decodes Run-length encoding LE from a 8-bit BinHex stream and calculates
CRCs (Cyclic Redundancy Check) from the decoded bytes as it passes them to
the caller.
@author Erwin Bolwidt
*/
public class RLE_CRCInputStream extends FilterInputStream {
/**
The size of the streambuffer. Could be anything that's not too small.
Bigger sizes probably improve performance, up to a point.
*/
final static int sz_streamBuf = 1024;
/**
This character signals that the previous character must be repeated
a number of times (Run-Length Encoding), unless the character after
it is 0, in which case it simply means the literal 0x90 character.
*/
final static int rleChar = 0x90;
/**
Constructs a RLE_CRCInputStream from a stream that is a source of 7-bit
Hqx7 encoded data. This is the typical use for files fetched from the
Internet or through e-mail. Internally, a Hqx7_to_Hqx8InputStream is
created to translate from 7-bit to 8-bit format before passing the data
through this stream.
*/
public RLE_CRCInputStream(InputStream source)
{
super(new Hqx7_to_Hqx8InputStream(source));
}
/**
Constructs a RLE_CRCInputStream from a stream that is either a source
of 7-bit Hqx7 encoded data or of pure 8-bit data in Hqx8 format. The
flag eightBit tells this class what to expect.
@param source
the data source
@param eightBit
if true, the data source must supply 8-bit data in Hqx8 format.
If false, the data source must supply 7-bit data in Hqx7 format.
*/
public RLE_CRCInputStream(InputStream source, boolean eightBit)
{
super(eightBit ? source : new Hqx7_to_Hqx8InputStream(source));
}
/**
Internal method to get the next physical byte from the superclass
stream, while keeping buffering consistent.
@return
the byte that was read, or -1 if end-of-file was encountered for
the first time. Any subsequent read throws an EOFException.
@exception EOFException
thrown when this method is called after it returned -1 once.
*/
private int nextStreamByte() throws IOException
{
if(sbFilled == -1)
throw new EOFException("End of file already reached.");
if(sbIndex < sbFilled)
// Take care to return no sign-extended numbers, hence the & 0xff
return ((int)streamBuffer[sbIndex++]) & 0xff;
sbFilled = super.read(streamBuffer, 0, streamBuffer.length);
if(sbFilled <= 0)
{
sbFilled = -1;
return sbFilled;
}
sbIndex = 0;
// Take care to return no sign-extended numbers, hence the & 0xff
return ((int)streamBuffer[sbIndex++]) & 0xff;
}
private int nextDecodedByte() throws IOException
{
// Check if we're still busy expanding a run-length-encoding.
// No reads are necessary in that case.
if(inRLE)
{
// Being 'inRLE' means we should repeat 'lastByte' for 'rleRepeat'
// times, until rleRepeat is 0.
if(--rleRepeat <= 0)
inRLE = false;
// lastByte remains the same
updateCRC(lastByte);
return lastByte;
}
// Read from the stream
int b = nextStreamByte();
if(b == -1)
{
// Invalidate lastByte
lastByte = -1;
return -1;
}
// Check if it's the start of a run-length-encoding.
// RLE's need special handling.
if(b == rleChar)
{
// Start of RLE
int c = nextStreamByte();
if(c == -1)
throw new EOFException(
"Corrupted Hqx8 stream, EOF just after a "
+ "0x90 RLE char.");
if(c == 0)
{
// No RLE, just a single 0x90 character
// lastByte must be set, because 0x90 could itself be
// subject to RLE expansion.
lastByte = rleChar;
updateCRC(rleChar);
return rleChar;
}
// Repeat minus two because: the first one was when it
// the byte was returned normally, and the second time is now.
rleRepeat = c - 2;
if(rleRepeat > 0)
inRLE = true;
// lastByte remains the same
updateCRC(lastByte);
return lastByte;
}
else
{
// Plain old straight data passing through. Do remember this
// as the lastByte though, because the next character could
// be the RLE char which means that _this_ character needs
// to be repeated.
lastByte = b;
updateCRC(b);
return b;
}
}
private void updateCRC(int b)
{
// This is from Peter Lewis' article. It's probably very inefficient
// so if anyone can give me a better version, I'd be much obliged.
boolean temp;
for(int i = 0 ; i < 8; i++)
{
temp = (calculatedCRC & 0x8000) != 0;
calculatedCRC = (calculatedCRC << 1) | (b >> 7);
if(temp)
calculatedCRC ^= 0x1021;
b = (b << 1) & 0xff;
}
}
/**
Resets the calculated CRC to zero. If your file contains multiple sections,
as the BinHex4 format does, you must reset it before switching to a new
section if you want to calculate CRCs for that section.
*/
public void resetCRC()
{
calculatedCRC = 0;
}
/**
Returns the CRC calculated over the data that was read since the beginning
of the stream or since the last call to resetCRC.
Must only be called after all the data was read in a section, because
the CRC is updated as if two extra 0 bytes were read. This is dictated
by the BinHex4 protocol.
*/
public int getCRC()
{
updateCRC(0);
updateCRC(0);
return calculatedCRC & 0xffff;
}
public int read() throws IOException
{
if(seenEOF)
{
// If this method is called a second time AFTER a -1, the
// caller must know for itself and be ready to get an EOFException.
// So set seenEOF to false again, and nextDecodedByte will throw
// one of these.
seenEOF = false;
return -1;
}
return nextDecodedByte();
}
public int read(byte[] b) throws IOException
{
return read(b, 0, b.length);
}
public int read(byte[] b, int off, int len) throws IOException
{
if(seenEOF)
{
// If this method is called a second time AFTER a -1, the
// caller must know for itself and be ready to get an EOFException.
// So set seenEOF to false again, and nextDecodedByte will throw
// one of these.
seenEOF = false;
return -1;
}
for(int i = off, max = off+len; i < max; i++)
{
int t = nextDecodedByte();
if(t == -1) {
if(i == off)
// No data read yet, so safe to return -1
return -1;
seenEOF = true;
return i - off;
}
b[i] = (byte)t;
}
return len;
}
public static void main(String[] args)
{
try {
InputStream in = new RLE_CRCInputStream(System.in);
byte[] buf = new byte[1024];
System.err.println("Starting to convert");
while(true)
{
int r = in.read(buf);
if(r <= 0)
return;
System.out.write(buf, 0, r);
}
} catch(IOException e)
{
e.printStackTrace();
}
}
/**
True if private method nextDecodedByte is still repeating a character
that was part of a Run-Length Encoding sequence.
*/
private boolean inRLE;
/**
The last byte that was returned by nextDecodedByte. When nextDecodedByte
encounters a RLE-repeat code, it repeats this character a number of times.
*/
private int lastByte;
/**
If inRLE is true, then nextDecodedByte will return the byte
<code>lastByte</code> another <code>rleRepeat</code> times.
*/
private int rleRepeat;
/**
Bytes that were read from the stream but not all yet processed.
*/
private byte[] streamBuffer = new byte[sz_streamBuf];
/**
The next byte in the stream buffer to process.
*/
private int sbIndex = 0;
/**
How many bytes in the buffer are stream data; the buffer could
be longer than that.
*/
private int sbFilled = 0;
/**
The read(byte[], int, int) call cannot immediately signal eof with a -1
when it sees it, since it may already have read some data. So it sets
this flag, which it checks the next time it is called.
*/
private boolean seenEOF = false;
/**
The CRC value that is being calculated.
*/
private int calculatedCRC;
}