cryptix.util.mime
Class Base64InputStream
FilterInputStream
cryptix.util.mime.Base64InputStream
public class Base64InputStream
extends FilterInputStream
This class implements a BASE64 Character stream encoder as specified
in RFC1521, part of the MIME specification as published by the Internet
Engineering Task Force (IETF).
Unlike other encoding schemes there is nothing in this encoding that
indicates where a buffer starts or ends. In other words, the encoded
text simply starts at the first line and ends with the last one.
Copyright © 1995-1997
Systemics Ltd on behalf of the
Cryptix Development Team.
All rights reserved.
$Revision: 1.1.1.1 $
- FH
- Raif S. Naffah
- Cryptix 2.2.2
cryptix.mime.Base64OutputStream
, cryptix.mime.Base64
Base64InputStream(InputStream is) - Create a Base64InputStream with no checksum.
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Base64InputStream(InputStream is, Checksum checksum, int length) - Creates a Base64InputStream that uses the given checksum.
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Base64InputStream(InputStream is, boolean check) - If check is true then look for and check a PGP-style checksum
immediately after the base64 portion.
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int | available() - Returns the number of bytes that can be guaranteed to be read from this
input stream without blocking.
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void | close()
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void | mark(int readlimit) - Does nothing, since this class does not support mark/reset.
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boolean | markSupported() - Tests if this input stream supports the
mark and
reset methods of InputStream, which it does not.
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int | read() - Parse input in fours, producing three bytes to outBuf.
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int | read(byte[] buffer, int offset, int length)
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void | reset() - Always throws an IOException, since this class does not support mark/reset.
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long | skip(long n) - Skips over and discards n bytes of data from the
input stream.
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CONV_OTHER
(package private) static final int CONV_OTHER
- -3
CONV_PAD
(package private) static final int CONV_PAD
- -2
CONV_WHITE
(package private) static final int CONV_WHITE
- -1
Base64InputStream
public Base64InputStream(InputStream is)
Create a Base64InputStream with no checksum.
Base64InputStream
public Base64InputStream(InputStream is,
Checksum checksum,
int length)
Creates a Base64InputStream that uses the given checksum.
The checksum will be length bytes long, where
0 <= length <= 8.
Base64InputStream
public Base64InputStream(InputStream is,
boolean check)
If check is true then look for and check a PGP-style checksum
immediately after the base64 portion.
PRZ24
available
public int available()
throws IOException
Returns the number of bytes that can be guaranteed to be read from this
input stream without blocking. For a Base64InputStream, this is sometimes
0 even when data is available, because we do not read ahead far enough to
determine whether the next character is the start of the checksum.
close
public void close()
throws IOException
mark
public void mark(int readlimit)
Does nothing, since this class does not support mark/reset.
markSupported
public boolean markSupported()
Tests if this input stream supports the mark
and
reset
methods of InputStream, which it does not.
false
, since this class does not support the
mark
and reset
methods.
read
public int read()
throws IOException
Parse input in fours, producing three bytes to outBuf. Should only
see whitespace or illegal characters on a quadruplet boundary.
When using a checksum, wait for a "=" as the first character of
a quadruplet; read sufficient quadruplets for
crcLength
bytes, and compare with our crc. If the end of the stream is reached
at a bad spot, throw EOFException.
If we get the first illegal character on a four byte boundary, return
-1 (Java EOF convention). Iff the underlying input stream is an
instanceof
PushbackInputStream, the illegal character
will be pushed back.
java.io.PushbackInputStream
read
public int read(byte[] buffer,
int offset,
int length)
throws IOException
reset
public void reset()
throws IOException
Always throws an IOException, since this class does not support mark/reset.
skip
public long skip(long n)
throws IOException
Skips over and discards n bytes of data from the
input stream. The skip
method may, for a variety of
reasons, end up skipping over some smaller number of bytes,
possibly 0. The actual number of bytes skipped is returned.
n
- the number of bytes to be skipped.
- the actual number of bytes skipped.