+++ /dev/null
-/*\r
- * Copyright 2001-2004 The Apache Software Foundation.\r
- * \r
- * Licensed under the Apache License, Version 2.0 (the "License");\r
- * you may not use this file except in compliance with the License.\r
- * You may obtain a copy of the License at\r
- * \r
- * http://www.apache.org/licenses/LICENSE-2.0\r
- * \r
- * Unless required by applicable law or agreed to in writing, software\r
- * distributed under the License is distributed on an "AS IS" BASIS,\r
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
- * See the License for the specific language governing permissions and\r
- * limitations under the License.\r
- */ \r
-\r
-package org.apache.commons.codec.binary;\r
-\r
-import org.apache.commons.codec.BinaryDecoder;\r
-import org.apache.commons.codec.BinaryEncoder;\r
-import org.apache.commons.codec.DecoderException;\r
-import org.apache.commons.codec.EncoderException;\r
-\r
-/**\r
- * Provides Base64 encoding and decoding as defined by RFC 2045.\r
- * \r
- * <p>This class implements section <cite>6.8. Base64 Content-Transfer-Encoding</cite> \r
- * from RFC 2045 <cite>Multipurpose Internet Mail Extensions (MIME) Part One: \r
- * Format of Internet Message Bodies</cite> by Freed and Borenstein.</p> \r
- *\r
- * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045</a>\r
- * @author Apache Software Foundation\r
- * @since 1.0-dev\r
- * @version $Id$\r
- */\r
-public class Base64 implements BinaryEncoder, BinaryDecoder {\r
-\r
- /**\r
- * Chunk size per RFC 2045 section 6.8.\r
- * \r
- * <p>The {@value} character limit does not count the trailing CRLF, but counts \r
- * all other characters, including any equal signs.</p>\r
- * \r
- * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 6.8</a>\r
- */\r
- static final int CHUNK_SIZE = 76;\r
-\r
- /**\r
- * Chunk separator per RFC 2045 section 2.1.\r
- * \r
- * @see <a href="http://www.ietf.org/rfc/rfc2045.txt">RFC 2045 section 2.1</a>\r
- */\r
- static final byte[] CHUNK_SEPARATOR = "\r\n".getBytes();\r
-\r
- /**\r
- * The base length.\r
- */\r
- static final int BASELENGTH = 255;\r
-\r
- /**\r
- * Lookup length.\r
- */\r
- static final int LOOKUPLENGTH = 64;\r
-\r
- /**\r
- * Used to calculate the number of bits in a byte.\r
- */\r
- static final int EIGHTBIT = 8;\r
-\r
- /**\r
- * Used when encoding something which has fewer than 24 bits.\r
- */\r
- static final int SIXTEENBIT = 16;\r
-\r
- /**\r
- * Used to determine how many bits data contains.\r
- */\r
- static final int TWENTYFOURBITGROUP = 24;\r
-\r
- /**\r
- * Used to get the number of Quadruples.\r
- */\r
- static final int FOURBYTE = 4;\r
-\r
- /**\r
- * Used to test the sign of a byte.\r
- */\r
- static final int SIGN = -128;\r
- \r
- /**\r
- * Byte used to pad output.\r
- */\r
- static final byte PAD = (byte) '=';\r
-\r
- // Create arrays to hold the base64 characters and a \r
- // lookup for base64 chars\r
- private static byte[] base64Alphabet = new byte[BASELENGTH];\r
- private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];\r
-\r
- // Populating the lookup and character arrays\r
- static {\r
- for (int i = 0; i < BASELENGTH; i++) {\r
- base64Alphabet[i] = (byte) -1;\r
- }\r
- for (int i = 'Z'; i >= 'A'; i--) {\r
- base64Alphabet[i] = (byte) (i - 'A');\r
- }\r
- for (int i = 'z'; i >= 'a'; i--) {\r
- base64Alphabet[i] = (byte) (i - 'a' + 26);\r
- }\r
- for (int i = '9'; i >= '0'; i--) {\r
- base64Alphabet[i] = (byte) (i - '0' + 52);\r
- }\r
-\r
- base64Alphabet['+'] = 62;\r
- base64Alphabet['/'] = 63;\r
-\r
- for (int i = 0; i <= 25; i++) {\r
- lookUpBase64Alphabet[i] = (byte) ('A' + i);\r
- }\r
-\r
- for (int i = 26, j = 0; i <= 51; i++, j++) {\r
- lookUpBase64Alphabet[i] = (byte) ('a' + j);\r
- }\r
-\r
- for (int i = 52, j = 0; i <= 61; i++, j++) {\r
- lookUpBase64Alphabet[i] = (byte) ('0' + j);\r
- }\r
-\r
- lookUpBase64Alphabet[62] = (byte) '+';\r
- lookUpBase64Alphabet[63] = (byte) '/';\r
- }\r
-\r
- private static boolean isBase64(byte octect) {\r
- if (octect == PAD) {\r
- return true;\r
- } else if (base64Alphabet[octect] == -1) {\r
- return false;\r
- } else {\r
- return true;\r
- }\r
- }\r
-\r
- /**\r
- * Tests a given byte array to see if it contains\r
- * only valid characters within the Base64 alphabet.\r
- *\r
- * @param arrayOctect byte array to test\r
- * @return true if all bytes are valid characters in the Base64\r
- * alphabet or if the byte array is empty; false, otherwise\r
- */\r
- public static boolean isArrayByteBase64(byte[] arrayOctect) {\r
-\r
- arrayOctect = discardWhitespace(arrayOctect);\r
-\r
- int length = arrayOctect.length;\r
- if (length == 0) {\r
- // shouldn't a 0 length array be valid base64 data?\r
- // return false;\r
- return true;\r
- }\r
- for (int i = 0; i < length; i++) {\r
- if (!isBase64(arrayOctect[i])) {\r
- return false;\r
- }\r
- }\r
- return true;\r
- }\r
-\r
- /**\r
- * Encodes binary data using the base64 algorithm but\r
- * does not chunk the output.\r
- *\r
- * @param binaryData binary data to encode\r
- * @return Base64 characters\r
- */\r
- public static byte[] encodeBase64(byte[] binaryData) {\r
- return encodeBase64(binaryData, false);\r
- }\r
-\r
- /**\r
- * Encodes binary data using the base64 algorithm and chunks\r
- * the encoded output into 76 character blocks\r
- *\r
- * @param binaryData binary data to encode\r
- * @return Base64 characters chunked in 76 character blocks\r
- */\r
- public static byte[] encodeBase64Chunked(byte[] binaryData) {\r
- return encodeBase64(binaryData, true);\r
- }\r
-\r
-\r
- /**\r
- * Decodes an Object using the base64 algorithm. This method\r
- * is provided in order to satisfy the requirements of the\r
- * Decoder interface, and will throw a DecoderException if the\r
- * supplied object is not of type byte[].\r
- *\r
- * @param pObject Object to decode\r
- * @return An object (of type byte[]) containing the \r
- * binary data which corresponds to the byte[] supplied.\r
- * @throws DecoderException if the parameter supplied is not\r
- * of type byte[]\r
- */\r
- public Object decode(Object pObject) throws DecoderException {\r
- if (!(pObject instanceof byte[])) {\r
- throw new DecoderException("Parameter supplied to Base64 decode is not a byte[]");\r
- }\r
- return decode((byte[]) pObject);\r
- }\r
-\r
- /**\r
- * Decodes a byte[] containing containing\r
- * characters in the Base64 alphabet.\r
- *\r
- * @param pArray A byte array containing Base64 character data\r
- * @return a byte array containing binary data\r
- */\r
- public byte[] decode(byte[] pArray) {\r
- return decodeBase64(pArray);\r
- }\r
-\r
- /**\r
- * Encodes binary data using the base64 algorithm, optionally\r
- * chunking the output into 76 character blocks.\r
- *\r
- * @param binaryData Array containing binary data to encode.\r
- * @param isChunked if isChunked is true this encoder will chunk\r
- * the base64 output into 76 character blocks\r
- * @return Base64-encoded data.\r
- */\r
- public static byte[] encodeBase64(byte[] binaryData, boolean isChunked) {\r
- int lengthDataBits = binaryData.length * EIGHTBIT;\r
- int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;\r
- int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;\r
- byte encodedData[] = null;\r
- int encodedDataLength = 0;\r
- int nbrChunks = 0;\r
-\r
- if (fewerThan24bits != 0) {\r
- //data not divisible by 24 bit\r
- encodedDataLength = (numberTriplets + 1) * 4;\r
- } else {\r
- // 16 or 8 bit\r
- encodedDataLength = numberTriplets * 4;\r
- }\r
-\r
- // If the output is to be "chunked" into 76 character sections, \r
- // for compliance with RFC 2045 MIME, then it is important to \r
- // allow for extra length to account for the separator(s)\r
- if (isChunked) {\r
-\r
- nbrChunks =\r
- (CHUNK_SEPARATOR.length == 0 ? 0 : (int) Math.ceil((float) encodedDataLength / CHUNK_SIZE));\r
- encodedDataLength += nbrChunks * CHUNK_SEPARATOR.length;\r
- }\r
-\r
- encodedData = new byte[encodedDataLength];\r
-\r
- byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;\r
-\r
- int encodedIndex = 0;\r
- int dataIndex = 0;\r
- int i = 0;\r
- int nextSeparatorIndex = CHUNK_SIZE;\r
- int chunksSoFar = 0;\r
-\r
- //log.debug("number of triplets = " + numberTriplets);\r
- for (i = 0; i < numberTriplets; i++) {\r
- dataIndex = i * 3;\r
- b1 = binaryData[dataIndex];\r
- b2 = binaryData[dataIndex + 1];\r
- b3 = binaryData[dataIndex + 2];\r
-\r
- //log.debug("b1= " + b1 +", b2= " + b2 + ", b3= " + b3);\r
-\r
- l = (byte) (b2 & 0x0f);\r
- k = (byte) (b1 & 0x03);\r
-\r
- byte val1 =\r
- ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);\r
- byte val2 =\r
- ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);\r
- byte val3 =\r
- ((b3 & SIGN) == 0) ? (byte) (b3 >> 6) : (byte) ((b3) >> 6 ^ 0xfc);\r
-\r
- encodedData[encodedIndex] = lookUpBase64Alphabet[val1];\r
- //log.debug( "val2 = " + val2 );\r
- //log.debug( "k4 = " + (k<<4) );\r
- //log.debug( "vak = " + (val2 | (k<<4)) );\r
- encodedData[encodedIndex + 1] =\r
- lookUpBase64Alphabet[val2 | (k << 4)];\r
- encodedData[encodedIndex + 2] =\r
- lookUpBase64Alphabet[(l << 2) | val3];\r
- encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];\r
-\r
- encodedIndex += 4;\r
-\r
- // If we are chunking, let's put a chunk separator down.\r
- if (isChunked) {\r
- // this assumes that CHUNK_SIZE % 4 == 0\r
- if (encodedIndex == nextSeparatorIndex) {\r
- System.arraycopy(\r
- CHUNK_SEPARATOR,\r
- 0,\r
- encodedData,\r
- encodedIndex,\r
- CHUNK_SEPARATOR.length);\r
- chunksSoFar++;\r
- nextSeparatorIndex =\r
- (CHUNK_SIZE * (chunksSoFar + 1)) + \r
- (chunksSoFar * CHUNK_SEPARATOR.length);\r
- encodedIndex += CHUNK_SEPARATOR.length;\r
- }\r
- }\r
- }\r
-\r
- // form integral number of 6-bit groups\r
- dataIndex = i * 3;\r
-\r
- if (fewerThan24bits == EIGHTBIT) {\r
- b1 = binaryData[dataIndex];\r
- k = (byte) (b1 & 0x03);\r
- //log.debug("b1=" + b1);\r
- //log.debug("b1<<2 = " + (b1>>2) );\r
- byte val1 =\r
- ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);\r
- encodedData[encodedIndex] = lookUpBase64Alphabet[val1];\r
- encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];\r
- encodedData[encodedIndex + 2] = PAD;\r
- encodedData[encodedIndex + 3] = PAD;\r
- } else if (fewerThan24bits == SIXTEENBIT) {\r
-\r
- b1 = binaryData[dataIndex];\r
- b2 = binaryData[dataIndex + 1];\r
- l = (byte) (b2 & 0x0f);\r
- k = (byte) (b1 & 0x03);\r
-\r
- byte val1 =\r
- ((b1 & SIGN) == 0) ? (byte) (b1 >> 2) : (byte) ((b1) >> 2 ^ 0xc0);\r
- byte val2 =\r
- ((b2 & SIGN) == 0) ? (byte) (b2 >> 4) : (byte) ((b2) >> 4 ^ 0xf0);\r
-\r
- encodedData[encodedIndex] = lookUpBase64Alphabet[val1];\r
- encodedData[encodedIndex + 1] =\r
- lookUpBase64Alphabet[val2 | (k << 4)];\r
- encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];\r
- encodedData[encodedIndex + 3] = PAD;\r
- }\r
-\r
- if (isChunked) {\r
- // we also add a separator to the end of the final chunk.\r
- if (chunksSoFar < nbrChunks) {\r
- System.arraycopy(\r
- CHUNK_SEPARATOR,\r
- 0,\r
- encodedData,\r
- encodedDataLength - CHUNK_SEPARATOR.length,\r
- CHUNK_SEPARATOR.length);\r
- }\r
- }\r
-\r
- return encodedData;\r
- }\r
-\r
- /**\r
- * Decodes Base64 data into octects\r
- *\r
- * @param base64Data Byte array containing Base64 data\r
- * @return Array containing decoded data.\r
- */\r
- public static byte[] decodeBase64(byte[] base64Data) {\r
- // RFC 2045 requires that we discard ALL non-Base64 characters\r
- base64Data = discardNonBase64(base64Data);\r
-\r
- // handle the edge case, so we don't have to worry about it later\r
- if (base64Data.length == 0) {\r
- return new byte[0];\r
- }\r
-\r
- int numberQuadruple = base64Data.length / FOURBYTE;\r
- byte decodedData[] = null;\r
- byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;\r
-\r
- // Throw away anything not in base64Data\r
-\r
- int encodedIndex = 0;\r
- int dataIndex = 0;\r
- {\r
- // this sizes the output array properly - rlw\r
- int lastData = base64Data.length;\r
- // ignore the '=' padding\r
- while (base64Data[lastData - 1] == PAD) {\r
- if (--lastData == 0) {\r
- return new byte[0];\r
- }\r
- }\r
- decodedData = new byte[lastData - numberQuadruple];\r
- }\r
- \r
- for (int i = 0; i < numberQuadruple; i++) {\r
- dataIndex = i * 4;\r
- marker0 = base64Data[dataIndex + 2];\r
- marker1 = base64Data[dataIndex + 3];\r
- \r
- b1 = base64Alphabet[base64Data[dataIndex]];\r
- b2 = base64Alphabet[base64Data[dataIndex + 1]];\r
- \r
- if (marker0 != PAD && marker1 != PAD) {\r
- //No PAD e.g 3cQl\r
- b3 = base64Alphabet[marker0];\r
- b4 = base64Alphabet[marker1];\r
- \r
- decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);\r
- decodedData[encodedIndex + 1] =\r
- (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));\r
- decodedData[encodedIndex + 2] = (byte) (b3 << 6 | b4);\r
- } else if (marker0 == PAD) {\r
- //Two PAD e.g. 3c[Pad][Pad]\r
- decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);\r
- } else if (marker1 == PAD) {\r
- //One PAD e.g. 3cQ[Pad]\r
- b3 = base64Alphabet[marker0];\r
- \r
- decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);\r
- decodedData[encodedIndex + 1] =\r
- (byte) (((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));\r
- }\r
- encodedIndex += 3;\r
- }\r
- return decodedData;\r
- }\r
- \r
- /**\r
- * Discards any whitespace from a base-64 encoded block.\r
- *\r
- * @param data The base-64 encoded data to discard the whitespace\r
- * from.\r
- * @return The data, less whitespace (see RFC 2045).\r
- */\r
- static byte[] discardWhitespace(byte[] data) {\r
- byte groomedData[] = new byte[data.length];\r
- int bytesCopied = 0;\r
- \r
- for (int i = 0; i < data.length; i++) {\r
- switch (data[i]) {\r
- case (byte) ' ' :\r
- case (byte) '\n' :\r
- case (byte) '\r' :\r
- case (byte) '\t' :\r
- break;\r
- default:\r
- groomedData[bytesCopied++] = data[i];\r
- }\r
- }\r
-\r
- byte packedData[] = new byte[bytesCopied];\r
-\r
- System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);\r
-\r
- return packedData;\r
- }\r
-\r
- /**\r
- * Discards any characters outside of the base64 alphabet, per\r
- * the requirements on page 25 of RFC 2045 - "Any characters\r
- * outside of the base64 alphabet are to be ignored in base64\r
- * encoded data."\r
- *\r
- * @param data The base-64 encoded data to groom\r
- * @return The data, less non-base64 characters (see RFC 2045).\r
- */\r
- static byte[] discardNonBase64(byte[] data) {\r
- byte groomedData[] = new byte[data.length];\r
- int bytesCopied = 0;\r
-\r
- for (int i = 0; i < data.length; i++) {\r
- if (isBase64(data[i])) {\r
- groomedData[bytesCopied++] = data[i];\r
- }\r
- }\r
-\r
- byte packedData[] = new byte[bytesCopied];\r
-\r
- System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);\r
-\r
- return packedData;\r
- }\r
-\r
-\r
- // Implementation of the Encoder Interface\r
-\r
- /**\r
- * Encodes an Object using the base64 algorithm. This method\r
- * is provided in order to satisfy the requirements of the\r
- * Encoder interface, and will throw an EncoderException if the\r
- * supplied object is not of type byte[].\r
- *\r
- * @param pObject Object to encode\r
- * @return An object (of type byte[]) containing the \r
- * base64 encoded data which corresponds to the byte[] supplied.\r
- * @throws EncoderException if the parameter supplied is not\r
- * of type byte[]\r
- */\r
- public Object encode(Object pObject) throws EncoderException {\r
- if (!(pObject instanceof byte[])) {\r
- throw new EncoderException(\r
- "Parameter supplied to Base64 encode is not a byte[]");\r
- }\r
- return encode((byte[]) pObject);\r
- }\r
-\r
- /**\r
- * Encodes a byte[] containing binary data, into a byte[] containing\r
- * characters in the Base64 alphabet.\r
- *\r
- * @param pArray a byte array containing binary data\r
- * @return A byte array containing only Base64 character data\r
- */\r
- public byte[] encode(byte[] pArray) {\r
- return encodeBase64(pArray, false);\r
- }\r
-\r
-}\r
git://scientific.zcu.cz / jra1mw.git / commitdiff