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/*
* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.github.scribejava.core.java8;
import java.io.FilterOutputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Objects;
/**
* This class consists exclusively of static methods for obtaining encoders and decoders for the Base64 encoding scheme.
* The implementation of this class supports the following types of Base64 as specified in
* RFC 4648 and
* RFC 2045.
*
*
* - Basic
*
* Uses "The Base64 Alphabet" as specified in Table 1 of RFC 4648 and RFC 2045 for encoding and decoding operation. The
* encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters
* outside the base64 alphabet.
*
* - URL and Filename safe
*
* Uses the "URL and Filename safe Base64 Alphabet" as specified in Table 2 of RFC 4648 for encoding and decoding. The
* encoder does not add any line feed (line separator) character. The decoder rejects data that contains characters
* outside the base64 alphabet.
*
* - MIME
*
* Uses the "The Base64 Alphabet" as specified in Table 1 of RFC 2045 for encoding and decoding operation. The encoded
* output must be represented in lines of no more than 76 characters each and uses a carriage return {@code '\r'}
* followed immediately by a linefeed {@code '\n'} as the line separator. No line separator is added to the end of the
* encoded output. All line separators or other characters not found in the base64 alphabet table are ignored in
* decoding operation.
*
*
*
* Unless otherwise noted, passing a {@code null} argument to a method of this class will cause a {@link java.lang.NullPointerException
* NullPointerException} to be thrown.
*
* @author Xueming Shen
* @since 1.8
*/
public class Base64 {
private Base64() {
}
/**
* Returns a {@link Encoder} that encodes using the
* Basic type base64 encoding scheme.
*
* @return A Base64 encoder.
*/
public static Encoder getEncoder() {
return Encoder.RFC4648;
}
/**
* Returns a {@link Encoder} that encodes using the
* URL and Filename safe type base64 encoding scheme.
*
* @return A Base64 encoder.
*/
public static Encoder getUrlEncoder() {
return Encoder.RFC4648_URLSAFE;
}
/**
* Returns a {@link Encoder} that encodes using the
* MIME type base64 encoding scheme.
*
* @return A Base64 encoder.
*/
public static Encoder getMimeEncoder() {
return Encoder.RFC2045;
}
/**
* Returns a {@link Encoder} that encodes using the
* MIME type base64 encoding scheme with specified line length and line separators.
*
* @param lineLength the length of each output line (rounded down to nearest multiple of 4). If
* {@code lineLength <= 0} the output will not be separated in lines
* @param lineSeparator the line separator for each output line
*
* @return A Base64 encoder.
*
* @throws IllegalArgumentException if {@code lineSeparator} includes any character of "The Base64 Alphabet" as
* specified in Table 1 of RFC 2045.
*/
public static Encoder getMimeEncoder(int lineLength, byte[] lineSeparator) {
Objects.requireNonNull(lineSeparator);
int[] base64 = Decoder.FROM_BASE_64;
for (byte b : lineSeparator) {
if (base64[b & 0xff] != -1) {
throw new IllegalArgumentException(
"Illegal base64 line separator character 0x" + Integer.toString(b, 16));
}
}
if (lineLength <= 0) {
return Encoder.RFC4648;
}
return new Encoder(false, lineSeparator, lineLength >> 2 << 2, true);
}
/**
* Returns a {@link Decoder} that decodes using the
* Basic type base64 encoding scheme.
*
* @return A Base64 decoder.
*/
public static Decoder getDecoder() {
return Decoder.RFC4648;
}
/**
* Returns a {@link Decoder} that decodes using the
* URL and Filename safe type base64 encoding scheme.
*
* @return A Base64 decoder.
*/
public static Decoder getUrlDecoder() {
return Decoder.RFC4648_URLSAFE;
}
/**
* Returns a {@link Decoder} that decodes using the
* MIME type base64 decoding scheme.
*
* @return A Base64 decoder.
*/
public static Decoder getMimeDecoder() {
return Decoder.RFC2045;
}
/**
* This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648
* and RFC 2045.
*
*
* Instances of {@link Encoder} class are safe for use by multiple concurrent threads.
*
*
* Unless otherwise noted, passing a {@code null} argument to a method of this class will cause a
* {@link java.lang.NullPointerException NullPointerException} to be thrown.
*
* @see Decoder
* @since 1.8
*/
public static class Encoder {
private final byte[] newline;
private final int linemax;
private final boolean isURL;
private final boolean doPadding;
/**
* This array is a lookup table that translates 6-bit positive integer index values into their "Base64 Alphabet"
* equivalents as specified in "Table 1: The Base64 Alphabet" of RFC 2045 (and RFC 4648).
*/
private static final char[] TO_BASE_64 = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
/**
* It's the lookup table for "URL and Filename safe Base64" as specified in Table 2 of the RFC 4648, with the
* '+' and '/' changed to '-' and '_'. This table is used when BASE64_URL is specified.
*/
private static final char[] TO_BASE_64_URL = {
'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '-', '_'
};
private static final int MIMELINEMAX = 76;
private static final byte[] CRLF = new byte[]{'\r', '\n'};
static final Encoder RFC4648 = new Encoder(false, null, -1, true);
static final Encoder RFC4648_URLSAFE = new Encoder(true, null, -1, true);
static final Encoder RFC2045 = new Encoder(false, CRLF, MIMELINEMAX, true);
private Encoder(boolean isURL, byte[] newline, int linemax, boolean doPadding) {
this.isURL = isURL;
this.newline = newline;
this.linemax = linemax;
this.doPadding = doPadding;
}
private int outLength(int srclen) {
int len;
if (doPadding) {
len = 4 * ((srclen + 2) / 3);
} else {
int n = srclen % 3;
len = 4 * (srclen / 3) + (n == 0 ? 0 : n + 1);
}
if (linemax > 0) // line separators
{
len += (len - 1) / linemax * newline.length;
}
return len;
}
/**
* Encodes all bytes from the specified byte array into a newly-allocated byte array using the {@link Base64}
* encoding scheme. The returned byte array is of the length of the resulting bytes.
*
* @param src the byte array to encode
* @return A newly-allocated byte array containing the resulting encoded bytes.
*/
public byte[] encode(byte[] src) {
int len = outLength(src.length); // dst array size
byte[] dst = new byte[len];
int ret = encode0(src, 0, src.length, dst);
if (ret != dst.length) {
return Arrays.copyOf(dst, ret);
}
return dst;
}
/**
* Encodes all bytes from the specified byte array using the {@link Base64} encoding scheme, writing the
* resulting bytes to the given output byte array, starting at offset 0.
*
*
* It is the responsibility of the invoker of this method to make sure the output byte array {@code dst} has
* enough space for encoding all bytes from the input byte array. No bytes will be written to the output byte
* array if the output byte array is not big enough.
*
* @param src the byte array to encode
* @param dst the output byte array
* @return The number of bytes written to the output byte array
*
* @throws IllegalArgumentException if {@code dst} does not have enough space for encoding all input bytes.
*/
public int encode(byte[] src, byte[] dst) {
int len = outLength(src.length); // dst array size
if (dst.length < len) {
throw new IllegalArgumentException(
"Output byte array is too small for encoding all input bytes");
}
return encode0(src, 0, src.length, dst);
}
/**
* Encodes the specified byte array into a String using the {@link Base64} encoding scheme.
*
*
* This method first encodes all input bytes into a base64 encoded byte array and then constructs a new String
* by using the encoded byte array and the {@link java.nio.charset.StandardCharsets#ISO_8859_1
* ISO-8859-1} charset.
*
*
* In other words, an invocation of this method has exactly the same effect as invoking
* {@code new String(encode(src), StandardCharsets.ISO_8859_1)}.
*
* @param src the byte array to encode
* @return A String containing the resulting Base64 encoded characters
*/
@SuppressWarnings("deprecation")
public String encodeToString(byte[] src) {
byte[] encoded = encode(src);
return new String(encoded, 0, 0, encoded.length);
}
/**
* Encodes all remaining bytes from the specified byte buffer into a newly-allocated ByteBuffer using the
* {@link Base64} encoding scheme.
*
* Upon return, the source buffer's position will be updated to its limit; its limit will not have been changed.
* The returned output buffer's position will be zero and its limit will be the number of resulting encoded
* bytes.
*
* @param buffer the source ByteBuffer to encode
* @return A newly-allocated byte buffer containing the encoded bytes.
*/
public ByteBuffer encode(ByteBuffer buffer) {
int len = outLength(buffer.remaining());
byte[] dst = new byte[len];
int ret;
if (buffer.hasArray()) {
ret = encode0(buffer.array(),
buffer.arrayOffset() + buffer.position(),
buffer.arrayOffset() + buffer.limit(),
dst);
buffer.position(buffer.limit());
} else {
byte[] src = new byte[buffer.remaining()];
buffer.get(src);
ret = encode0(src, 0, src.length, dst);
}
if (ret != dst.length) {
dst = Arrays.copyOf(dst, ret);
}
return ByteBuffer.wrap(dst);
}
/**
* Wraps an output stream for encoding byte data using the {@link Base64} encoding scheme.
*
*
* It is recommended to promptly close the returned output stream after use, during which it will flush all
* possible leftover bytes to the underlying output stream. Closing the returned output stream will close the
* underlying output stream.
*
* @param os the output stream.
* @return the output stream for encoding the byte data into the specified Base64 encoded format
*/
public OutputStream wrap(OutputStream os) {
Objects.requireNonNull(os);
return new EncOutputStream(os, isURL ? TO_BASE_64_URL : TO_BASE_64,
newline, linemax, doPadding);
}
/**
* Returns an encoder instance that encodes equivalently to this one, but without adding any padding character
* at the end of the encoded byte data.
*
*
* The encoding scheme of this encoder instance is unaffected by this invocation. The returned encoder instance
* should be used for non-padding encoding operation.
*
* @return an equivalent encoder that encodes without adding any padding character at the end
*/
public Encoder withoutPadding() {
if (!doPadding) {
return this;
}
return new Encoder(isURL, newline, linemax, false);
}
private int encode0(byte[] src, int off, int end, byte[] dst) {
char[] base64 = isURL ? TO_BASE_64_URL : TO_BASE_64;
int sp = off;
int slen = (end - off) / 3 * 3;
int sl = off + slen;
if (linemax > 0 && slen > linemax / 4 * 3) {
slen = linemax / 4 * 3;
}
int dp = 0;
while (sp < sl) {
int sl0 = Math.min(sp + slen, sl);
for (int sp0 = sp, dp0 = dp; sp0 < sl0;) {
int bits = (src[sp0++] & 0xff) << 16
| (src[sp0++] & 0xff) << 8
| (src[sp0++] & 0xff);
dst[dp0++] = (byte) base64[(bits >>> 18) & 0x3f];
dst[dp0++] = (byte) base64[(bits >>> 12) & 0x3f];
dst[dp0++] = (byte) base64[(bits >>> 6) & 0x3f];
dst[dp0++] = (byte) base64[bits & 0x3f];
}
int dlen = (sl0 - sp) / 3 * 4;
dp += dlen;
sp = sl0;
if (dlen == linemax && sp < end) {
for (byte b : newline) {
dst[dp++] = b;
}
}
}
if (sp < end) { // 1 or 2 leftover bytes
int b0 = src[sp++] & 0xff;
dst[dp++] = (byte) base64[b0 >> 2];
if (sp == end) {
dst[dp++] = (byte) base64[(b0 << 4) & 0x3f];
if (doPadding) {
dst[dp++] = '=';
dst[dp++] = '=';
}
} else {
int b1 = src[sp++] & 0xff;
dst[dp++] = (byte) base64[(b0 << 4) & 0x3f | (b1 >> 4)];
dst[dp++] = (byte) base64[(b1 << 2) & 0x3f];
if (doPadding) {
dst[dp++] = '=';
}
}
}
return dp;
}
}
/**
* This class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648
* and RFC 2045.
*
*
* The Base64 padding character {@code '='} is accepted and interpreted as the end of the encoded byte data, but is
* not required. So if the final unit of the encoded byte data only has two or three Base64 characters (without the
* corresponding padding character(s) padded), they are decoded as if followed by padding character(s). If there is
* a padding character present in the final unit, the correct number of padding character(s) must be present,
* otherwise {@code IllegalArgumentException} ( {@code IOException} when reading from a Base64 stream) is thrown
* during decoding.
*
*
* Instances of {@link Decoder} class are safe for use by multiple concurrent threads.
*
*
* Unless otherwise noted, passing a {@code null} argument to a method of this class will cause a
* {@link java.lang.NullPointerException NullPointerException} to be thrown.
*
* @see Encoder
* @since 1.8
*/
public static class Decoder {
private final boolean isURL;
private final boolean isMIME;
/**
* Lookup table for decoding unicode characters drawn from the "Base64 Alphabet" (as specified in Table 1 of RFC
* 2045) into their 6-bit positive integer equivalents. Characters that are not in the Base64 alphabet but fall
* within the bounds of the array are encoded to -1.
*
*/
private static final int[] FROM_BASE_64 = new int[256];
static {
Arrays.fill(FROM_BASE_64, -1);
for (int i = 0; i < Encoder.TO_BASE_64.length; i++) {
FROM_BASE_64[Encoder.TO_BASE_64[i]] = i;
}
FROM_BASE_64['='] = -2;
}
/**
* Lookup table for decoding "URL and Filename safe Base64 Alphabet" as specified in Table2 of the RFC 4648.
*/
private static final int[] FROM_BASE_64_URL = new int[256];
static {
Arrays.fill(FROM_BASE_64_URL, -1);
for (int i = 0; i < Encoder.TO_BASE_64_URL.length; i++) {
FROM_BASE_64_URL[Encoder.TO_BASE_64_URL[i]] = i;
}
FROM_BASE_64_URL['='] = -2;
}
static final Decoder RFC4648 = new Decoder(false, false);
static final Decoder RFC4648_URLSAFE = new Decoder(true, false);
static final Decoder RFC2045 = new Decoder(false, true);
private Decoder(boolean isURL, boolean isMIME) {
this.isURL = isURL;
this.isMIME = isMIME;
}
/**
* Decodes all bytes from the input byte array using the {@link Base64} encoding scheme, writing the results
* into a newly-allocated output byte array. The returned byte array is of the length of the resulting bytes.
*
* @param src the byte array to decode
*
* @return A newly-allocated byte array containing the decoded bytes.
*
* @throws IllegalArgumentException if {@code src} is not in valid Base64 scheme
*/
public byte[] decode(byte[] src) {
byte[] dst = new byte[outLength(src, 0, src.length)];
int ret = decode0(src, 0, src.length, dst);
if (ret != dst.length) {
dst = Arrays.copyOf(dst, ret);
}
return dst;
}
/**
* Decodes a Base64 encoded String into a newly-allocated byte array using the {@link Base64} encoding scheme.
*
*
* An invocation of this method has exactly the same effect as invoking
* {@code decode(src.getBytes(StandardCharsets.ISO_8859_1))}
*
* @param src the string to decode
*
* @return A newly-allocated byte array containing the decoded bytes.
*
* @throws IllegalArgumentException if {@code src} is not in valid Base64 scheme
*/
public byte[] decode(String src) {
return decode(src.getBytes(StandardCharsets.ISO_8859_1));
}
/**
* Decodes all bytes from the input byte array using the {@link Base64} encoding scheme, writing the results
* into the given output byte array, starting at offset 0.
*
*
* It is the responsibility of the invoker of this method to make sure the output byte array {@code dst} has
* enough space for decoding all bytes from the input byte array. No bytes will be be written to the output byte
* array if the output byte array is not big enough.
*
*
* If the input byte array is not in valid Base64 encoding scheme then some bytes may have been written to the
* output byte array before IllegalargumentException is thrown.
*
* @param src the byte array to decode
* @param dst the output byte array
*
* @return The number of bytes written to the output byte array
*
* @throws IllegalArgumentException if {@code src} is not in valid Base64 scheme, or {@code dst} does not have
* enough space for decoding all input bytes.
*/
public int decode(byte[] src, byte[] dst) {
int len = outLength(src, 0, src.length);
if (dst.length < len) {
throw new IllegalArgumentException(
"Output byte array is too small for decoding all input bytes");
}
return decode0(src, 0, src.length, dst);
}
/**
* Decodes all bytes from the input byte buffer using the {@link Base64} encoding scheme, writing the results
* into a newly-allocated ByteBuffer.
*
*
* Upon return, the source buffer's position will be updated to its limit; its limit will not have been changed.
* The returned output buffer's position will be zero and its limit will be the number of resulting decoded
* bytes
*
*
* {@code IllegalArgumentException} is thrown if the input buffer is not in valid Base64 encoding scheme. The
* position of the input buffer will not be advanced in this case.
*
* @param buffer the ByteBuffer to decode
*
* @return A newly-allocated byte buffer containing the decoded bytes
*
* @throws IllegalArgumentException if {@code src} is not in valid Base64 scheme.
*/
public ByteBuffer decode(ByteBuffer buffer) {
int pos0 = buffer.position();
try {
byte[] src;
int sp;
int sl;
if (buffer.hasArray()) {
src = buffer.array();
sp = buffer.arrayOffset() + buffer.position();
sl = buffer.arrayOffset() + buffer.limit();
buffer.position(buffer.limit());
} else {
src = new byte[buffer.remaining()];
buffer.get(src);
sp = 0;
sl = src.length;
}
byte[] dst = new byte[outLength(src, sp, sl)];
return ByteBuffer.wrap(dst, 0, decode0(src, sp, sl, dst));
} catch (IllegalArgumentException iae) {
buffer.position(pos0);
throw iae;
}
}
/**
* Returns an input stream for decoding {@link Base64} encoded byte stream.
*
*
* The {@code read} methods of the returned {@code InputStream} will throw {@code IOException} when reading
* bytes that cannot be decoded.
*
*
* Closing the returned input stream will close the underlying input stream.
*
* @param is the input stream
*
* @return the input stream for decoding the specified Base64 encoded byte stream
*/
public InputStream wrap(InputStream is) {
Objects.requireNonNull(is);
return new DecInputStream(is, isURL ? FROM_BASE_64_URL : FROM_BASE_64, isMIME);
}
private int outLength(byte[] src, int sp, int sl) {
int[] base64 = isURL ? FROM_BASE_64_URL : FROM_BASE_64;
int paddings = 0;
int len = sl - sp;
if (len == 0) {
return 0;
}
if (len < 2) {
if (isMIME && base64[0] == -1) {
return 0;
}
throw new IllegalArgumentException(
"Input byte[] should at least have 2 bytes for base64 bytes");
}
if (isMIME) {
// scan all bytes to fill out all non-alphabet. a performance
// trade-off of pre-scan or Arrays.copyOf
int n = 0;
while (sp < sl) {
int b = src[sp++] & 0xff;
if (b == '=') {
len -= sl - sp + 1;
break;
}
b = base64[b];
if (b == -1) {
n++;
}
}
len -= n;
} else {
if (src[sl - 1] == '=') {
paddings++;
if (src[sl - 2] == '=') {
paddings++;
}
}
}
if (paddings == 0 && (len & 0x3) != 0) {
paddings = 4 - (len & 0x3);
}
return 3 * ((len + 3) / 4) - paddings;
}
private int decode0(byte[] src, int sp, int sl, byte[] dst) {
int[] base64 = isURL ? FROM_BASE_64_URL : FROM_BASE_64;
int dp = 0;
int bits = 0;
int shiftto = 18; // pos of first byte of 4-byte atom
while (sp < sl) {
int b = src[sp++] & 0xff;
b = base64[b];
if (b < 0) {
if (b == -2) { // padding byte '='
// = shiftto==18 unnecessary padding
// x= shiftto==12 a dangling single x
// x to be handled together with non-padding case
// xx= shiftto==6&&sp==sl missing last =
// xx=y shiftto==6 last is not =
if (shiftto == 6 && (sp == sl || src[sp++] != '=')
|| shiftto == 18) {
throw new IllegalArgumentException(
"Input byte array has wrong 4-byte ending unit");
}
break;
}
if (isMIME) // skip if for rfc2045
{
continue;
} else {
throw new IllegalArgumentException(
"Illegal base64 character "
+ Integer.toString(src[sp - 1], 16));
}
}
bits |= b << shiftto;
shiftto -= 6;
if (shiftto < 0) {
dst[dp++] = (byte) (bits >> 16);
dst[dp++] = (byte) (bits >> 8);
dst[dp++] = (byte) (bits);
shiftto = 18;
bits = 0;
}
}
// reached end of byte array or hit padding '=' characters.
switch (shiftto) {
case 6:
dst[dp++] = (byte) (bits >> 16);
break;
case 0:
dst[dp++] = (byte) (bits >> 16);
dst[dp++] = (byte) (bits >> 8);
break;
case 12:
// dangling single "x", incorrectly encoded.
throw new IllegalArgumentException(
"Last unit does not have enough valid bits");
default:
break;
}
// anything left is invalid, if is not MIME.
// if MIME, ignore all non-base64 character
while (sp < sl) {
if (isMIME && base64[src[sp++]] < 0) {
continue;
}
throw new IllegalArgumentException(
"Input byte array has incorrect ending byte at " + sp);
}
return dp;
}
}
/*
* An output stream for encoding bytes into the Base64.
*/
private static class EncOutputStream extends FilterOutputStream {
private int leftover;
private int b0;
private int b1;
private int b2;
private boolean closed;
private final char[] base64; // byte->base64 mapping
private final byte[] newline; // line separator, if needed
private final int linemax;
private final boolean doPadding;// whether or not to pad
private int linepos;
EncOutputStream(OutputStream os, char[] base64,
byte[] newline, int linemax, boolean doPadding) {
super(os);
this.base64 = base64;
this.newline = newline;
this.linemax = linemax;
this.doPadding = doPadding;
}
@Override
public void write(int b) throws IOException {
byte[] buf = new byte[1];
buf[0] = (byte) (b & 0xff);
write(buf, 0, 1);
}
private void checkNewline() throws IOException {
if (linepos == linemax) {
out.write(newline);
linepos = 0;
}
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
if (closed) {
throw new IOException("Stream is closed");
}
if (off < 0 || len < 0 || off + len > b.length) {
throw new ArrayIndexOutOfBoundsException();
}
if (len == 0) {
return;
}
if (leftover != 0) {
if (leftover == 1) {
b1 = b[off++] & 0xff;
len--;
if (len == 0) {
leftover++;
return;
}
}
b2 = b[off++] & 0xff;
len--;
checkNewline();
out.write(base64[b0 >> 2]);
out.write(base64[(b0 << 4) & 0x3f | (b1 >> 4)]);
out.write(base64[(b1 << 2) & 0x3f | (b2 >> 6)]);
out.write(base64[b2 & 0x3f]);
linepos += 4;
}
int nBits24 = len / 3;
leftover = len - (nBits24 * 3);
while (nBits24-- > 0) {
checkNewline();
int bits = (b[off++] & 0xff) << 16
| (b[off++] & 0xff) << 8
| (b[off++] & 0xff);
out.write(base64[(bits >>> 18) & 0x3f]);
out.write(base64[(bits >>> 12) & 0x3f]);
out.write(base64[(bits >>> 6) & 0x3f]);
out.write(base64[bits & 0x3f]);
linepos += 4;
}
if (leftover == 1) {
b0 = b[off++] & 0xff;
} else if (leftover == 2) {
b0 = b[off++] & 0xff;
b1 = b[off++] & 0xff;
}
}
@Override
public void close() throws IOException {
if (!closed) {
closed = true;
if (leftover == 1) {
checkNewline();
out.write(base64[b0 >> 2]);
out.write(base64[(b0 << 4) & 0x3f]);
if (doPadding) {
out.write('=');
out.write('=');
}
} else if (leftover == 2) {
checkNewline();
out.write(base64[b0 >> 2]);
out.write(base64[(b0 << 4) & 0x3f | (b1 >> 4)]);
out.write(base64[(b1 << 2) & 0x3f]);
if (doPadding) {
out.write('=');
}
}
leftover = 0;
out.close();
}
}
}
/*
* An input stream for decoding Base64 bytes
*/
private static class DecInputStream extends InputStream {
private final InputStream is;
private final boolean isMIME;
private final int[] base64; // base64 -> byte mapping
private int bits; // 24-bit buffer for decoding
private int nextin = 18; // next available "off" in "bits" for input;
// -> 18, 12, 6, 0
private int nextout = -8; // next available "off" in "bits" for output;
// -> 8, 0, -8 (no byte for output)
private boolean eof;
private boolean closed;
private final byte[] sbBuf = new byte[1];
DecInputStream(InputStream is, int[] base64, boolean isMIME) {
this.is = is;
this.base64 = base64;
this.isMIME = isMIME;
}
@Override
public int read() throws IOException {
return read(sbBuf, 0, 1) == -1 ? -1 : sbBuf[0] & 0xff;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
if (closed) {
throw new IOException("Stream is closed");
}
if (eof && nextout < 0) // eof and no leftover
{
return -1;
}
if (off < 0 || len < 0 || len > b.length - off) {
throw new IndexOutOfBoundsException();
}
int oldOff = off;
if (nextout >= 0) { // leftover output byte(s) in bits buf
do {
if (len == 0) {
return off - oldOff;
}
b[off++] = (byte) (bits >> nextout);
len--;
nextout -= 8;
} while (nextout >= 0);
bits = 0;
}
while (len > 0) {
int v = is.read();
if (v == -1) {
eof = true;
if (nextin != 18) {
if (nextin == 12) {
throw new IOException("Base64 stream has one un-decoded dangling byte.");
}
// treat ending xx/xxx without padding character legal.
// same logic as v == '=' below
b[off++] = (byte) (bits >> (16));
len--;
if (nextin == 0) { // only one padding byte
if (len == 0) { // no enough output space
bits >>= 8; // shift to lowest byte
nextout = 0;
} else {
b[off++] = (byte) (bits >> 8);
}
}
}
if (off == oldOff) {
return -1;
} else {
return off - oldOff;
}
}
if (v == '=') { // padding byte(s)
// = shiftto==18 unnecessary padding
// x= shiftto==12 dangling x, invalid unit
// xx= shiftto==6 && missing last '='
// xx=y or last is not '='
if (nextin == 18 || nextin == 12
|| nextin == 6 && is.read() != '=') {
throw new IOException("Illegal base64 ending sequence:" + nextin);
}
b[off++] = (byte) (bits >> (16));
len--;
if (nextin == 0) { // only one padding byte
if (len == 0) { // no enough output space
bits >>= 8; // shift to lowest byte
nextout = 0;
} else {
b[off++] = (byte) (bits >> 8);
}
}
eof = true;
break;
}
v = base64[v];
if (v == -1) {
if (isMIME) // skip if for rfc2045
{
continue;
} else {
throw new IOException("Illegal base64 character "
+ Integer.toString(v, 16));
}
}
bits |= v << nextin;
if (nextin == 0) {
nextin = 18; // clear for next
nextout = 16;
while (nextout >= 0) {
b[off++] = (byte) (bits >> nextout);
len--;
nextout -= 8;
if (len == 0 && nextout >= 0) { // don't clean "bits"
return off - oldOff;
}
}
bits = 0;
} else {
nextin -= 6;
}
}
return off - oldOff;
}
@Override
public int available() throws IOException {
if (closed) {
throw new IOException("Stream is closed");
}
return is.available(); // TBD:
}
@Override
public void close() throws IOException {
if (!closed) {
closed = true;
is.close();
}
}
}
}