Apache Commons Codec Source Code
Apache Commons Codec library
provides implementations of common encoders and decoders such as Base64, Hex,
Phonetic and URLs.
Apache Commons Codec Source Code files are provided in both binary packge (commons-codec-3.15-bin.zip) and source package (commons-codec-3.15-src.zip). You can download them at Apache Commons Codec Website.
Apache Commons Codec Source Code has no dependencies. You can compile it to generate your own version of Apache Commons Codec JAR file.
The source code of Apache Commons Codec 1.15 is provided below:
✍: FYIcenter
⏎ org/apache/commons/codec/net/QuotedPrintableCodec.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.codec.net;
import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.nio.charset.IllegalCharsetNameException;
import java.nio.charset.StandardCharsets;
import java.nio.charset.UnsupportedCharsetException;
import java.util.BitSet;
import org.apache.commons.codec.BinaryDecoder;
import org.apache.commons.codec.BinaryEncoder;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.StringDecoder;
import org.apache.commons.codec.StringEncoder;
import org.apache.commons.codec.binary.StringUtils;
/**
* Codec for the Quoted-Printable section of <a href="http://www.ietf.org/rfc/rfc1521.txt">RFC 1521</a>.
* <p>
* The Quoted-Printable encoding is intended to represent data that largely consists of octets that correspond to
* printable characters in the ASCII character set. It encodes the data in such a way that the resulting octets are
* unlikely to be modified by mail transport. If the data being encoded are mostly ASCII text, the encoded form of the
* data remains largely recognizable by humans. A body which is entirely ASCII may also be encoded in Quoted-Printable
* to ensure the integrity of the data should the message pass through a character- translating, and/or line-wrapping
* gateway.
* </p>
* <p>
* Note:
* </p>
* <p>
* Depending on the selected {@code strict} parameter, this class will implement a different set of rules of the
* quoted-printable spec:
* </p>
* <ul>
* <li>{@code strict=false}: only rules #1 and #2 are implemented</li>
* <li>{@code strict=true}: all rules #1 through #5 are implemented</li>
* </ul>
* <p>
* Originally, this class only supported the non-strict mode, but the codec in this partial form could already be used
* for certain applications that do not require quoted-printable line formatting (rules #3, #4, #5), for instance
* Q codec. The strict mode has been added in 1.10.
* </p>
* <p>
* This class is immutable and thread-safe.
* </p>
*
* @see <a href="http://www.ietf.org/rfc/rfc1521.txt">RFC 1521 MIME (Multipurpose Internet Mail Extensions) Part One:
* Mechanisms for Specifying and Describing the Format of Internet Message Bodies </a>
*
* @since 1.3
*/
public class QuotedPrintableCodec implements BinaryEncoder, BinaryDecoder, StringEncoder, StringDecoder {
/**
* The default Charset used for string decoding and encoding.
*/
private final Charset charset;
/**
* Indicates whether soft line breaks shall be used during encoding (rule #3-5).
*/
private final boolean strict;
/**
* BitSet of printable characters as defined in RFC 1521.
*/
private static final BitSet PRINTABLE_CHARS = new BitSet(256);
private static final byte ESCAPE_CHAR = '=';
private static final byte TAB = 9;
private static final byte SPACE = 32;
private static final byte CR = 13;
private static final byte LF = 10;
/**
* Safe line length for quoted printable encoded text.
*/
private static final int SAFE_LENGTH = 73;
// Static initializer for printable chars collection
static {
// alpha characters
for (int i = 33; i <= 60; i++) {
PRINTABLE_CHARS.set(i);
}
for (int i = 62; i <= 126; i++) {
PRINTABLE_CHARS.set(i);
}
PRINTABLE_CHARS.set(TAB);
PRINTABLE_CHARS.set(SPACE);
}
/**
* Default constructor, assumes default Charset of {@link StandardCharsets#UTF_8}
*/
public QuotedPrintableCodec() {
this(StandardCharsets.UTF_8, false);
}
/**
* Constructor which allows for the selection of the strict mode.
*
* @param strict
* if {@code true}, soft line breaks will be used
* @since 1.10
*/
public QuotedPrintableCodec(final boolean strict) {
this(StandardCharsets.UTF_8, strict);
}
/**
* Constructor which allows for the selection of a default Charset.
*
* @param charset
* the default string Charset to use.
* @since 1.7
*/
public QuotedPrintableCodec(final Charset charset) {
this(charset, false);
}
/**
* Constructor which allows for the selection of a default Charset and strict mode.
*
* @param charset
* the default string Charset to use.
* @param strict
* if {@code true}, soft line breaks will be used
* @since 1.10
*/
public QuotedPrintableCodec(final Charset charset, final boolean strict) {
this.charset = charset;
this.strict = strict;
}
/**
* Constructor which allows for the selection of a default Charset.
*
* @param charsetName
* the default string Charset to use.
* @throws UnsupportedCharsetException
* If no support for the named Charset is available
* in this instance of the Java virtual machine
* @throws IllegalArgumentException
* If the given charsetName is null
* @throws IllegalCharsetNameException
* If the given Charset name is illegal
*
* @since 1.7 throws UnsupportedCharsetException if the named Charset is unavailable
*/
public QuotedPrintableCodec(final String charsetName)
throws IllegalCharsetNameException, IllegalArgumentException, UnsupportedCharsetException {
this(Charset.forName(charsetName), false);
}
/**
* Encodes byte into its quoted-printable representation.
*
* @param b
* byte to encode
* @param buffer
* the buffer to write to
* @return The number of bytes written to the {@code buffer}
*/
private static final int encodeQuotedPrintable(final int b, final ByteArrayOutputStream buffer) {
buffer.write(ESCAPE_CHAR);
final char hex1 = Utils.hexDigit(b >> 4);
final char hex2 = Utils.hexDigit(b);
buffer.write(hex1);
buffer.write(hex2);
return 3;
}
/**
* Return the byte at position {@code index} of the byte array and
* make sure it is unsigned.
*
* @param index
* position in the array
* @param bytes
* the byte array
* @return the unsigned octet at position {@code index} from the array
*/
private static int getUnsignedOctet(final int index, final byte[] bytes) {
int b = bytes[index];
if (b < 0) {
b = 256 + b;
}
return b;
}
/**
* Write a byte to the buffer.
*
* @param b
* byte to write
* @param encode
* indicates whether the octet shall be encoded
* @param buffer
* the buffer to write to
* @return the number of bytes that have been written to the buffer
*/
private static int encodeByte(final int b, final boolean encode,
final ByteArrayOutputStream buffer) {
if (encode) {
return encodeQuotedPrintable(b, buffer);
}
buffer.write(b);
return 1;
}
/**
* Checks whether the given byte is whitespace.
*
* @param b
* byte to be checked
* @return {@code true} if the byte is either a space or tab character
*/
private static boolean isWhitespace(final int b) {
return b == SPACE || b == TAB;
}
/**
* Encodes an array of bytes into an array of quoted-printable 7-bit characters. Unsafe characters are escaped.
* <p>
* This function implements a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in
* RFC 1521 and is suitable for encoding binary data and unformatted text.
*
* @param printable
* bitset of characters deemed quoted-printable
* @param bytes
* array of bytes to be encoded
* @return array of bytes containing quoted-printable data
*/
public static final byte[] encodeQuotedPrintable(final BitSet printable, final byte[] bytes) {
return encodeQuotedPrintable(printable, bytes, false);
}
/**
* Encodes an array of bytes into an array of quoted-printable 7-bit characters. Unsafe characters are escaped.
* <p>
* Depending on the selection of the {@code strict} parameter, this function either implements the full ruleset
* or only a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in
* RFC 1521 and is suitable for encoding binary data and unformatted text.
*
* @param printable
* bitset of characters deemed quoted-printable
* @param bytes
* array of bytes to be encoded
* @param strict
* if {@code true} the full ruleset is used, otherwise only rule #1 and rule #2
* @return array of bytes containing quoted-printable data
* @since 1.10
*/
public static final byte[] encodeQuotedPrintable(BitSet printable, final byte[] bytes, final boolean strict) {
if (bytes == null) {
return null;
}
if (printable == null) {
printable = PRINTABLE_CHARS;
}
final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
if (strict) {
int pos = 1;
// encode up to buffer.length - 3, the last three octets will be treated
// separately for simplification of note #3
for (int i = 0; i < bytes.length - 3; i++) {
final int b = getUnsignedOctet(i, bytes);
if (pos < SAFE_LENGTH) {
// up to this length it is safe to add any byte, encoded or not
pos += encodeByte(b, !printable.get(b), buffer);
} else {
// rule #3: whitespace at the end of a line *must* be encoded
encodeByte(b, !printable.get(b) || isWhitespace(b), buffer);
// rule #5: soft line break
buffer.write(ESCAPE_CHAR);
buffer.write(CR);
buffer.write(LF);
pos = 1;
}
}
// rule #3: whitespace at the end of a line *must* be encoded
// if we would do a soft break line after this octet, encode whitespace
int b = getUnsignedOctet(bytes.length - 3, bytes);
boolean encode = !printable.get(b) || (isWhitespace(b) && pos > SAFE_LENGTH - 5);
pos += encodeByte(b, encode, buffer);
// note #3: '=' *must not* be the ultimate or penultimate character
// simplification: if < 6 bytes left, do a soft line break as we may need
// exactly 6 bytes space for the last 2 bytes
if (pos > SAFE_LENGTH - 2) {
buffer.write(ESCAPE_CHAR);
buffer.write(CR);
buffer.write(LF);
}
for (int i = bytes.length - 2; i < bytes.length; i++) {
b = getUnsignedOctet(i, bytes);
// rule #3: trailing whitespace shall be encoded
encode = !printable.get(b) || (i > bytes.length - 2 && isWhitespace(b));
encodeByte(b, encode, buffer);
}
} else {
for (final byte c : bytes) {
int b = c;
if (b < 0) {
b = 256 + b;
}
if (printable.get(b)) {
buffer.write(b);
} else {
encodeQuotedPrintable(b, buffer);
}
}
}
return buffer.toByteArray();
}
/**
* Decodes an array quoted-printable characters into an array of original bytes. Escaped characters are converted
* back to their original representation.
* <p>
* This function fully implements the quoted-printable encoding specification (rule #1 through rule #5) as
* defined in RFC 1521.
*
* @param bytes
* array of quoted-printable characters
* @return array of original bytes
* @throws DecoderException
* Thrown if quoted-printable decoding is unsuccessful
*/
public static final byte[] decodeQuotedPrintable(final byte[] bytes) throws DecoderException {
if (bytes == null) {
return null;
}
final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
for (int i = 0; i < bytes.length; i++) {
final int b = bytes[i];
if (b == ESCAPE_CHAR) {
try {
// if the next octet is a CR we have found a soft line break
if (bytes[++i] == CR) {
continue;
}
final int u = Utils.digit16(bytes[i]);
final int l = Utils.digit16(bytes[++i]);
buffer.write((char) ((u << 4) + l));
} catch (final ArrayIndexOutOfBoundsException e) {
throw new DecoderException("Invalid quoted-printable encoding", e);
}
} else if (b != CR && b != LF) {
// every other octet is appended except for CR & LF
buffer.write(b);
}
}
return buffer.toByteArray();
}
/**
* Encodes an array of bytes into an array of quoted-printable 7-bit characters. Unsafe characters are escaped.
* <p>
* Depending on the selection of the {@code strict} parameter, this function either implements the full ruleset
* or only a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in
* RFC 1521 and is suitable for encoding binary data and unformatted text.
*
* @param bytes
* array of bytes to be encoded
* @return array of bytes containing quoted-printable data
*/
@Override
public byte[] encode(final byte[] bytes) {
return encodeQuotedPrintable(PRINTABLE_CHARS, bytes, strict);
}
/**
* Decodes an array of quoted-printable characters into an array of original bytes. Escaped characters are converted
* back to their original representation.
* <p>
* This function fully implements the quoted-printable encoding specification (rule #1 through rule #5) as
* defined in RFC 1521.
*
* @param bytes
* array of quoted-printable characters
* @return array of original bytes
* @throws DecoderException
* Thrown if quoted-printable decoding is unsuccessful
*/
@Override
public byte[] decode(final byte[] bytes) throws DecoderException {
return decodeQuotedPrintable(bytes);
}
/**
* Encodes a string into its quoted-printable form using the default string Charset. Unsafe characters are escaped.
* <p>
* Depending on the selection of the {@code strict} parameter, this function either implements the full ruleset
* or only a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in
* RFC 1521 and is suitable for encoding binary data and unformatted text.
*
* @param sourceStr
* string to convert to quoted-printable form
* @return quoted-printable string
* @throws EncoderException
* Thrown if quoted-printable encoding is unsuccessful
*
* @see #getCharset()
*/
@Override
public String encode(final String sourceStr) throws EncoderException {
return this.encode(sourceStr, getCharset());
}
/**
* Decodes a quoted-printable string into its original form using the specified string Charset. Escaped characters
* are converted back to their original representation.
*
* @param sourceStr
* quoted-printable string to convert into its original form
* @param sourceCharset
* the original string Charset
* @return original string
* @throws DecoderException
* Thrown if quoted-printable decoding is unsuccessful
* @since 1.7
*/
public String decode(final String sourceStr, final Charset sourceCharset) throws DecoderException {
if (sourceStr == null) {
return null;
}
return new String(this.decode(StringUtils.getBytesUsAscii(sourceStr)), sourceCharset);
}
/**
* Decodes a quoted-printable string into its original form using the specified string Charset. Escaped characters
* are converted back to their original representation.
*
* @param sourceStr
* quoted-printable string to convert into its original form
* @param sourceCharset
* the original string Charset
* @return original string
* @throws DecoderException
* Thrown if quoted-printable decoding is unsuccessful
* @throws UnsupportedEncodingException
* Thrown if Charset is not supported
*/
public String decode(final String sourceStr, final String sourceCharset)
throws DecoderException, UnsupportedEncodingException {
if (sourceStr == null) {
return null;
}
return new String(decode(StringUtils.getBytesUsAscii(sourceStr)), sourceCharset);
}
/**
* Decodes a quoted-printable string into its original form using the default string Charset. Escaped characters are
* converted back to their original representation.
*
* @param sourceStr
* quoted-printable string to convert into its original form
* @return original string
* @throws DecoderException
* Thrown if quoted-printable decoding is unsuccessful. Thrown if Charset is not supported.
* @see #getCharset()
*/
@Override
public String decode(final String sourceStr) throws DecoderException {
return this.decode(sourceStr, this.getCharset());
}
/**
* Encodes an object into its quoted-printable safe form. Unsafe characters are escaped.
*
* @param obj
* string to convert to a quoted-printable form
* @return quoted-printable object
* @throws EncoderException
* Thrown if quoted-printable encoding is not applicable to objects of this type or if encoding is
* unsuccessful
*/
@Override
public Object encode(final Object obj) throws EncoderException {
if (obj == null) {
return null;
} else if (obj instanceof byte[]) {
return encode((byte[]) obj);
} else if (obj instanceof String) {
return encode((String) obj);
} else {
throw new EncoderException("Objects of type " +
obj.getClass().getName() +
" cannot be quoted-printable encoded");
}
}
/**
* Decodes a quoted-printable object into its original form. Escaped characters are converted back to their original
* representation.
*
* @param obj
* quoted-printable object to convert into its original form
* @return original object
* @throws DecoderException
* Thrown if the argument is not a {@code String} or {@code byte[]}. Thrown if a failure
* condition is encountered during the decode process.
*/
@Override
public Object decode(final Object obj) throws DecoderException {
if (obj == null) {
return null;
} else if (obj instanceof byte[]) {
return decode((byte[]) obj);
} else if (obj instanceof String) {
return decode((String) obj);
} else {
throw new DecoderException("Objects of type " +
obj.getClass().getName() +
" cannot be quoted-printable decoded");
}
}
/**
* Gets the default Charset name used for string decoding and encoding.
*
* @return the default Charset name
* @since 1.7
*/
public Charset getCharset() {
return this.charset;
}
/**
* Gets the default Charset name used for string decoding and encoding.
*
* @return the default Charset name
*/
public String getDefaultCharset() {
return this.charset.name();
}
/**
* Encodes a string into its quoted-printable form using the specified Charset. Unsafe characters are escaped.
* <p>
* Depending on the selection of the {@code strict} parameter, this function either implements the full ruleset
* or only a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in
* RFC 1521 and is suitable for encoding binary data and unformatted text.
*
* @param sourceStr
* string to convert to quoted-printable form
* @param sourceCharset
* the Charset for sourceStr
* @return quoted-printable string
* @since 1.7
*/
public String encode(final String sourceStr, final Charset sourceCharset) {
if (sourceStr == null) {
return null;
}
return StringUtils.newStringUsAscii(this.encode(sourceStr.getBytes(sourceCharset)));
}
/**
* Encodes a string into its quoted-printable form using the specified Charset. Unsafe characters are escaped.
* <p>
* Depending on the selection of the {@code strict} parameter, this function either implements the full ruleset
* or only a subset of quoted-printable encoding specification (rule #1 and rule #2) as defined in
* RFC 1521 and is suitable for encoding binary data and unformatted text.
*
* @param sourceStr
* string to convert to quoted-printable form
* @param sourceCharset
* the Charset for sourceStr
* @return quoted-printable string
* @throws UnsupportedEncodingException
* Thrown if the Charset is not supported
*/
public String encode(final String sourceStr, final String sourceCharset) throws UnsupportedEncodingException {
if (sourceStr == null) {
return null;
}
return StringUtils.newStringUsAscii(encode(sourceStr.getBytes(sourceCharset)));
}
}
⏎ org/apache/commons/codec/net/QuotedPrintableCodec.java
Or download all of them as a single archive file:
File name: commons-codec-1.15-sources.jar File size: 364441 bytes Release date: 2020-09-01 Download
⇒ Download and Install commons-codec-1.15-bin.zip
2020-06-28, 105645👍, 1💬
