com.sun.faces.io.Base64InputStream Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of javax.faces Show documentation
Show all versions of javax.faces Show documentation
This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
/*
* Copyright (c) 2004, Mikael Grev, MiG InfoCom AB. (base64 @ miginfocom . com)
* All rights reserved.
*/
package com.sun.faces.io;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
/**
* A slight spin on the standard ByteArrayInputStream. This
* one accepts only a Base64 encoded String in the constructor argument
* which decodes into a byte[] to be read from by
* other stream.
*/
public class Base64InputStream extends InputStream {
private static final int[] IA = new int[256];
private static final char[] CA =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
.toCharArray();
static {
Arrays.fill(IA, -1);
for (int i = 0, iS = CA.length; i < iS; i++) {
IA[CA[i]] = i;
}
IA['='] = 0;
}
/**
* An array of bytes that was provided
* by the creator of the stream. Elements buf[0]
* through buf[count-1] are the
* only bytes that can ever be read from the
* stream; element buf[pos] is
* the next byte to be read.
*/
protected byte buf[];
/**
* The index of the next character to read from the input stream buffer.
* This value should always be nonnegative
* and not larger than the value of count.
* The next byte to be read from the input stream buffer
* will be buf[pos].
*/
protected int pos;
/**
* The currently marked position in the stream.
* ByteArrayInputStream objects are marked at position zero by
* default when constructed. They may be marked at another
* position within the buffer by the mark() method.
* The current buffer position is set to this point by the
* reset() method.
*
* If no mark has been set, then the value of mark is the offset
* passed to the constructor (or 0 if the offset was not supplied).
*
* @since JDK1.1
*/
protected int mark = 0;
/**
* The index one greater than the last valid character in the input
* stream buffer.
* This value should always be nonnegative
* and not larger than the length of buf.
* It is one greater than the position of
* the last byte within buf that
* can ever be read from the input stream buffer.
*/
protected int count;
/**
* Creates a Base64InputStream.
*
* @param encodedString the Base64 encoded String
*/
public Base64InputStream(String encodedString) {
this.buf = decode(encodedString);
this.pos = 0;
this.count = buf.length;
}
/**
* Reads the next byte of data from this input stream. The value
* byte is returned as an int in the range
* 0 to 255. If no byte is available
* because the end of the stream has been reached, the value
* -1 is returned.
*
* This read method
* cannot block.
*
* @return the next byte of data, or -1 if the end of the
* stream has been reached.
*/
@Override
public int read() {
return (pos < count) ? (buf[pos++] & 0xff) : -1;
}
/**
* Reads up to len bytes of data into an array of bytes
* from this input stream.
* If pos equals count,
* then -1 is returned to indicate
* end of file. Otherwise, the number k
* of bytes read is equal to the smaller of
* len and count-pos.
* If k is positive, then bytes
* buf[pos] through buf[pos+k-1]
* are copied into b[off] through
* b[off+k-1] in the manner performed
* by System.arraycopy. The
* value k is added into pos
* and k is returned.
*
* This read method cannot block.
*
* @param b the buffer into which the data is read.
* @param off the start offset of the data.
* @param len the maximum number of bytes read.
*
* @return the total number of bytes read into the buffer, or
* -1 if there is no more data because the end of
* the stream has been reached.
*/
@Override
public int read(byte b[], int off, int len) {
if (b == null) {
throw new NullPointerException();
} else if ((off < 0) || (off > b.length) || (len < 0) ||
((off + len) > b.length) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
}
if (pos >= count) {
return -1;
}
if (pos + len > count) {
len = count - pos;
}
if (len <= 0) {
return 0;
}
System.arraycopy(buf, pos, b, off, len);
pos += len;
return len;
}
/**
* Skips n bytes of input from this input stream. Fewer
* bytes might be skipped if the end of the input stream is reached.
* The actual number k
* of bytes to be skipped is equal to the smaller
* of n and count-pos.
* The value k is added into pos
* and k is returned.
*
* @param n the number of bytes to be skipped.
*
* @return the actual number of bytes skipped.
*/
@Override
public long skip(long n) {
if (pos + n > count) {
n = count - pos;
}
if (n < 0) {
return 0;
}
pos += n;
return n;
}
/**
* Returns the number of bytes that can be read from this input
* stream without blocking.
* The value returned is
* count - pos,
* which is the number of bytes remaining to be read from the input buffer.
*
* @return the number of bytes that can be read from the input stream
* without blocking.
*/
@Override
public int available() {
return count - pos;
}
/**
* Tests if this InputStream supports mark/reset. The
* markSupported method of ByteArrayInputStream
* always returns true.
*
* @since JDK1.1
*/
@Override
public boolean markSupported() {
return true;
}
/**
* Set the current marked position in the stream.
* ByteArrayInputStream objects are marked at position zero by
* default when constructed. They may be marked at another
* position within the buffer by this method.
*
* If no mark has been set, then the value of the mark is the
* offset passed to the constructor (or 0 if the offset was not
* supplied).
*
* Note: The readAheadLimit for this class
* has no meaning.
*
* @since JDK1.1
*/
@Override
public void mark(int readAheadLimit) {
mark = pos;
}
/**
* Resets the buffer to the marked position. The marked position
* is 0 unless another position was marked or an offset was specified
* in the constructor.
*/
@Override
public void reset() {
pos = mark;
}
/**
* Closing a ByteArrayInputStream has no effect. The methods in
* this class can be called after the stream has been closed without
* generating an IOException.
*
*/
@Override
public void close() throws IOException {
}
/**
* Base64 decodes the source string. NOTE: This method doesn't
* consider line breaks
* @param source a Base64 encoded string
* @return the bytes of the decode process
*/
private byte[] decode(String source) {
// Check special case
int sLen = source.length();
if (sLen == 0) {
return new byte[0];
}
int sIx = 0, eIx =
sLen - 1; // Start and end index after trimming.
// Trim illegal chars from start
while (sIx < eIx && IA[source.charAt(sIx) & 0xff] < 0) {
sIx++;
}
// Trim illegal chars from end
while (eIx > 0 && IA[source.charAt(eIx) & 0xff] < 0)
eIx--;
// get the padding count (=) (0, 1 or 2)
int pad = source.charAt(eIx) == '='
? (source.charAt(eIx - 1) == '=' ? 2 : 1)
: 0; // Count '=' at end.
int cCnt = eIx - sIx
+ 1; // Content count including possible separators
int sepCnt =
sLen > 76 ? (source.charAt(76) == '\r' ? cCnt / 78 : 0) << 1 : 0;
int len = ((cCnt - sepCnt) * 6 >> 3)
- pad; // The number of decoded bytes
byte[] dArr =
new byte[len]; // Preallocate byte[] of exact length
// Decode all but the last 0 - 2 bytes.
int d = 0;
for (int eLen = (len / 3) * 3; d < eLen;) {
// Assemble three bytes into an int from four "valid" characters.
int i = IA[source.charAt(sIx++)] << 18
| IA[source.charAt(sIx++)] << 12
| IA[source.charAt(sIx++)] << 6
| IA[source.charAt(sIx++)];
// Add the bytes
dArr[d++] = (byte) (i >> 16);
dArr[d++] = (byte) (i >> 8);
dArr[d++] = (byte) i;
}
if (d < len) {
// Decode last 1-3 bytes (incl '=') into 1-3 bytes
int i = 0;
for (int j = 0; sIx <= eIx - pad; j++)
i |= IA[source.charAt(sIx++)] << (18 - j * 6);
for (int r = 16; d < len; r -= 8)
dArr[d++] = (byte) (i >> r);
}
return dArr;
}
// Test Case: com.sun.faces.io.TestIO
} // END Base64InputStream