/** * .功能： md5加密，如果加密失败，返回null 时间： 2015-7-9上午11:35:25 作者： lyf */ public static final String md5(String str) { try { MessageDigest md = MessageDigest.getInstance("MD5"); md.update(str.getBytes()); byte b[] = md.digest(); int i; StringBuffer buf = new StringBuffer(""); for (int offset = 0; offset < b.length; offset++) { i = b[offset]; if (i < 0) i += 256; if (i < 16) buf.append("0"); buf.append(Integer.toHexString(i)); } return buf.toString(); } catch (NoSuchAlgorithmException e) { System.out.println(e); } return null; } /** * java base 64 加密的方法 * @param str * @return */ public static final String base64Encode(String str) { byte[] b = null; String s = null; try { b = str.getBytes("utf-8"); } catch (Exception e) { e.printStackTrace(); } if (b != null) { s = Base64.encodeBytes(b); } return s; } /** * java的 base64 解密算法 * @param param * @return param */ public static String base64Decode(String param) { byte[] b = null; String result = null; if (param != null) { try { b = Base64.decode(param); result = new String(b, "utf-8"); } catch (Exception e) { e.printStackTrace(); } } return result; } /** * SHA-1 加密 * @param arg0 * @return */ public static final String sha1(String arg0) { try { MessageDigest digest = java.security.MessageDigest .getInstance("SHA-1"); digest.update(arg0.getBytes()); byte messageDigest[] = digest.digest(); // Create Hex String StringBuffer hexString = new StringBuffer(); // 字节数组转换为 十六进制 数 for (int i = 0; i < messageDigest.length; i++) { String shaHex = Integer.toHexString(messageDigest[i] & 0xFF); if (shaHex.length() < 2) { hexString.append(0); } hexString.append(shaHex); } return hexString.toString(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); return null; } } /** * SHA 加密 * @param decript * @return */ public static final String SHA(String decript) { try { MessageDigest digest = java.security.MessageDigest .getInstance("SHA"); digest.update(decript.getBytes()); byte messageDigest[] = digest.digest(); // Create Hex String StringBuffer hexString = new StringBuffer(); // 字节数组转换为 十六进制 数 for (int i = 0; i < messageDigest.length; i++) { String shaHex = Integer.toHexString(messageDigest[i] & 0xFF); if (shaHex.length() < 2) { hexString.append(0); } hexString.append(shaHex); } return hexString.toString(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); return null; } }
上文使用到的base64这个类如下：
package com.kuanyu.utils.core; public class Base64 { /* ******** P U B L I C F I E L D S ******** */ /** No options specified. Value is zero. */ public final static int NO_OPTIONS = 0; /** Specify encoding in first bit. Value is one. */ public final static int ENCODE = 1; /** Specify decoding in first bit. Value is zero. */ public final static int DECODE = 0; /** Specify that data should be gzip-compressed in second bit. Value is two. */ public final static int GZIP = 2; /** * Specify that gzipped data should <em>not</em> be automatically gunzipped. */ public final static int DONT_GUNZIP = 4; /** Do break lines when encoding. Value is 8. */ public final static int DO_BREAK_LINES = 8; /** * Encode using Base64-like encoding that is URL- and Filename-safe as * described in Section 4 of RFC3548: <a * href="http://www.faqs.org/rfcs/rfc3548.html" * >http://www.faqs.org/rfcs/rfc3548.html</a>. It is important to note that * data encoded this way is <em>not</em> officially valid Base64, or at the * very least should not be called Base64 without also specifying that is * was encoded using the URL- and Filename-safe dialect. */ public final static int URL_SAFE = 16; /** * Encode using the special "ordered" dialect of Base64 described here: <a * href="http://www.faqs.org/qa/rfcc-1940.html">http://www.faqs.org/qa/rfcc- * 1940.html</a>. */ public final static int ORDERED = 32; /* ******** P R I V A T E F I E L D S ******** */ /** Maximum line length (76) of Base64 output. */ private final static int MAX_LINE_LENGTH = 76; /** The equals sign (=) as a byte. */ private final static byte EQUALS_SIGN = (byte) '='; /** The new line character (\n) as a byte. */ private final static byte NEW_LINE = (byte) '\n'; /** Preferred encoding. */ private final static String PREFERRED_ENCODING = "US-ASCII"; private final static byte WHITE_SPACE_ENC = -5; // Indicates white space in // encoding private final static byte EQUALS_SIGN_ENC = -1; // Indicates equals sign in // encoding /* ******** S T A N D A R D B A S E 6 4 A L P H A B E T ******** */ /** The 64 valid Base64 values. */ /* * Host platform me be something funny like EBCDIC, so we hardcode these * values. */ private final static byte[] _STANDARD_ALPHABET = { (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) '+', (byte) '/' }; /** * Translates a Base64 value to either its 6-bit reconstruction value or a * negative number indicating some other meaning. **/ private final static byte[] _STANDARD_DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 0 - 8 -5, -5, // Whitespace: Tab and Linefeed -9, -9, // Decimal 11 - 12 -5, // Whitespace: Carriage Return -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - // 26 -9, -9, -9, -9, -9, // Decimal 27 - 31 -5, // Whitespace: Space -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 62, // Plus sign at decimal 43 -9, -9, -9, // Decimal 44 - 46 63, // Slash at decimal 47 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine -9, -9, -9, // Decimal 58 - 60 -1, // Equals sign at decimal 61 -9, -9, -9, // Decimal 62 - 64 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through // 'N' 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' // through 'Z' -9, -9, -9, -9, -9, -9, // Decimal 91 - 96 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' // through 'm' 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' // through 'z' -9, -9, -9, -9, -9 // Decimal 123 - 127 , -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 128 - // 139 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 140 - // 152 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 153 - // 165 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 166 - // 178 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 179 - // 191 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 192 - // 204 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 205 - // 217 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 218 - // 230 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 231 - // 243 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9 // Decimal 244 - 255 }; /* ******** U R L S A F E B A S E 6 4 A L P H A B E T ******** */ /** * Used in the URL- and Filename-safe dialect described in Section 4 of * RFC3548: <a * href="http://www.faqs.org/rfcs/rfc3548.html">http://www.faqs.org * /rfcs/rfc3548.html</a>. Notice that the last two bytes become "hyphen" * and "underscore" instead of "plus" and "slash." */ private final static byte[] _URL_SAFE_ALPHABET = { (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) '-', (byte) '_' }; /** * Used in decoding URL- and Filename-safe dialects of Base64. */ private final static byte[] _URL_SAFE_DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 0 - 8 -5, -5, // Whitespace: Tab and Linefeed -9, -9, // Decimal 11 - 12 -5, // Whitespace: Carriage Return -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - // 26 -9, -9, -9, -9, -9, // Decimal 27 - 31 -5, // Whitespace: Space -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 -9, // Plus sign at decimal 43 -9, // Decimal 44 62, // Minus sign at decimal 45 -9, // Decimal 46 -9, // Slash at decimal 47 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // Numbers zero through nine -9, -9, -9, // Decimal 58 - 60 -1, // Equals sign at decimal 61 -9, -9, -9, // Decimal 62 - 64 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, // Letters 'A' through // 'N' 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, // Letters 'O' // through 'Z' -9, -9, -9, -9, // Decimal 91 - 94 63, // Underscore at decimal 95 -9, // Decimal 96 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, // Letters 'a' // through 'm' 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, // Letters 'n' // through 'z' -9, -9, -9, -9, -9 // Decimal 123 - 127 , -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 128 - // 139 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 140 - // 152 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 153 - // 165 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 166 - // 178 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 179 - // 191 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 192 - // 204 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 205 - // 217 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 218 - // 230 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 231 - // 243 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9 // Decimal 244 - 255 }; /* ******** O R D E R E D B A S E 6 4 A L P H A B E T ******** */ /** * I don't get the point of this technique, but someone requested it, and it * is described here: <a * href="http://www.faqs.org/qa/rfcc-1940.html">http:// * www.faqs.org/qa/rfcc-1940.html</a>. */ private final static byte[] _ORDERED_ALPHABET = { (byte) '-', (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7', (byte) '8', (byte) '9', (byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D', (byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', (byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L', (byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', (byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T', (byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', (byte) 'Y', (byte) 'Z', (byte) '_', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', (byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j', (byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', (byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r', (byte) 's', (byte) 't', (byte) 'u', (byte) 'v', (byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z' }; /** * Used in decoding the "ordered" dialect of Base64. */ private final static byte[] _ORDERED_DECODABET = { -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 0 - 8 -5, -5, // Whitespace: Tab and Linefeed -9, -9, // Decimal 11 - 12 -5, // Whitespace: Carriage Return -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 14 - // 26 -9, -9, -9, -9, -9, // Decimal 27 - 31 -5, // Whitespace: Space -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 33 - 42 -9, // Plus sign at decimal 43 -9, // Decimal 44 0, // Minus sign at decimal 45 -9, // Decimal 46 -9, // Slash at decimal 47 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, // Numbers zero through nine -9, -9, -9, // Decimal 58 - 60 -1, // Equals sign at decimal 61 -9, -9, -9, // Decimal 62 - 64 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, // Letters 'A' // through 'M' 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, // Letters 'N' // through 'Z' -9, -9, -9, -9, // Decimal 91 - 94 37, // Underscore at decimal 95 -9, // Decimal 96 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, // Letters 'a' // through 'm' 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, // Letters 'n' // through 'z' -9, -9, -9, -9, -9 // Decimal 123 - 127 , -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 128 // - 139 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 140 - // 152 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 153 - // 165 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 166 - // 178 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 179 - // 191 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 192 - // 204 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 205 - // 217 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 218 - // 230 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, // Decimal 231 - // 243 -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9, -9 // Decimal 244 - 255 }; /* ******** D E T E R M I N E W H I C H A L H A B E T ******** */ /** * Returns one of the _SOMETHING_ALPHABET byte arrays depending on the * options specified. It's possible, though silly, to specify ORDERED * <b>and</b> URLSAFE in which case one of them will be picked, though there * is no guarantee as to which one will be picked. */ private final static byte[] getAlphabet(int options) { if ((options & URL_SAFE) == URL_SAFE) { return _URL_SAFE_ALPHABET; } else if ((options & ORDERED) == ORDERED) { return _ORDERED_ALPHABET; } else { return _STANDARD_ALPHABET; } } // end getAlphabet /** * Returns one of the _SOMETHING_DECODABET byte arrays depending on the * options specified. It's possible, though silly, to specify ORDERED and * URL_SAFE in which case one of them will be picked, though there is no * guarantee as to which one will be picked. */ private final static byte[] getDecodabet(int options) { if ((options & URL_SAFE) == URL_SAFE) { return _URL_SAFE_DECODABET; } else if ((options & ORDERED) == ORDERED) { return _ORDERED_DECODABET; } else { return _STANDARD_DECODABET; } } // end getAlphabet /** Defeats instantiation. */ private Base64() { } /* ******** E N C O D I N G M E T H O D S ******** */ /** * Encodes up to the first three bytes of array <var>threeBytes</var> and * returns a four-byte array in Base64 notation. The actual number of * significant bytes in your array is given by <var>numSigBytes</var>. The * array <var>threeBytes</var> needs only be as big as * <var>numSigBytes</var>. Code can reuse a byte array by passing a * four-byte array as <var>b4</var>. * * @param b4 * A reusable byte array to reduce array instantiation * @param threeBytes * the array to convert * @param numSigBytes * the number of significant bytes in your array * @return four byte array in Base64 notation. * @since 1.5.1 */ private static byte[] encode3to4(byte[] b4, byte[] threeBytes, int numSigBytes, int options) { encode3to4(threeBytes, 0, numSigBytes, b4, 0, options); return b4; } // end encode3to4 /** * <p> * Encodes up to three bytes of the array <var>source</var> and writes the * resulting four Base64 bytes to <var>destination</var>. The source and * destination arrays can be manipulated anywhere along their length by * specifying <var>srcOffset</var> and <var>destOffset</var>. This method * does not check to make sure your arrays are large enough to accomodate * <var>srcOffset</var> + 3 for the <var>source</var> array or * <var>destOffset</var> + 4 for the <var>destination</var> array. The * actual number of significant bytes in your array is given by * <var>numSigBytes</var>. * </p> * <p> * This is the lowest level of the encoding methods with all possible * parameters. * </p> * * @param source * the array to convert * @param srcOffset * the index where conversion begins * @param numSigBytes * the number of significant bytes in your array * @param destination * the array to hold the conversion * @param destOffset * the index where output will be put * @return the <var>destination</var> array * @since 1.3 */ private static byte[] encode3to4(byte[] source, int srcOffset, int numSigBytes, byte[] destination, int destOffset, int options) { byte[] ALPHABET = getAlphabet(options); // 1 2 3 // 01234567890123456789012345678901 Bit position // --------000000001111111122222222 Array position from threeBytes // --------| || || || | Six bit groups to index ALPHABET // >>18 >>12 >> 6 >> 0 Right shift necessary // 0x3f 0x3f 0x3f Additional AND // Create buffer with zero-padding if there are only one or two // significant bytes passed in the array. // We have to shift left 24 in order to flush out the 1's that appear // when Java treats a value as negative that is cast from a byte to an // int. int inBuff = (numSigBytes > 0 ? ((source[srcOffset] << 24) >>> 8) : 0) | (numSigBytes > 1 ? ((source[srcOffset + 1] << 24) >>> 16) : 0) | (numSigBytes > 2 ? ((source[srcOffset + 2] << 24) >>> 24) : 0); switch (numSigBytes) { case 3: destination[destOffset] = ALPHABET[(inBuff >>> 18)]; destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f]; destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f]; destination[destOffset + 3] = ALPHABET[(inBuff) & 0x3f]; return destination; case 2: destination[destOffset] = ALPHABET[(inBuff >>> 18)]; destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f]; destination[destOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3f]; destination[destOffset + 3] = EQUALS_SIGN; return destination; case 1: destination[destOffset] = ALPHABET[(inBuff >>> 18)]; destination[destOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3f]; destination[destOffset + 2] = EQUALS_SIGN; destination[destOffset + 3] = EQUALS_SIGN; return destination; default: return destination; } // end switch } // end encode3to4 /** * Performs Base64 encoding on the <code>raw</code> ByteBuffer, writing it * to the <code>encoded</code> ByteBuffer. This is an experimental feature. * Currently it does not pass along any options (such as * {@link #DO_BREAK_LINES} or {@link #GZIP}. * * @param raw * input buffer * @param encoded * output buffer * @since 2.3 */ public static void encode(java.nio.ByteBuffer raw, java.nio.ByteBuffer encoded) { byte[] raw3 = new byte[3]; byte[] enc4 = new byte[4]; while (raw.hasRemaining()) { int rem = Math.min(3, raw.remaining()); raw.get(raw3, 0, rem); Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS); encoded.put(enc4); } // end input remaining } /** * Performs Base64 encoding on the <code>raw</code> ByteBuffer, writing it * to the <code>encoded</code> CharBuffer. This is an experimental feature. * Currently it does not pass along any options (such as * {@link #DO_BREAK_LINES} or {@link #GZIP}. * * @param raw * input buffer * @param encoded * output buffer * @since 2.3 */ public static void encode(java.nio.ByteBuffer raw, java.nio.CharBuffer encoded) { byte[] raw3 = new byte[3]; byte[] enc4 = new byte[4]; while (raw.hasRemaining()) { int rem = Math.min(3, raw.remaining()); raw.get(raw3, 0, rem); Base64.encode3to4(enc4, raw3, rem, Base64.NO_OPTIONS); for (int i = 0; i < 4; i++) { encoded.put((char) (enc4[i] & 0xFF)); } } // end input remaining } /** * Serializes an object and returns the Base64-encoded version of that * serialized object. * * <p> * As of v 2.3, if the object cannot be serialized or there is another * error, the method will throw an java.io.IOException. <b>This is new to * v2.3!</b> In earlier versions, it just returned a null value, but in * retrospect that's a pretty poor way to handle it. * </p> * * The object is not GZip-compressed before being encoded. * * @param serializableObject * The object to encode * @return The Base64-encoded object * @throws java.io.IOException * if there is an error * @throws NullPointerException * if serializedObject is null * @since 1.4 */ public static String encodeObject(java.io.Serializable serializableObject) throws java.io.IOException { return encodeObject(serializableObject, NO_OPTIONS); } // end encodeObject /** * Serializes an object and returns the Base64-encoded version of that * serialized object. * * <p> * As of v 2.3, if the object cannot be serialized or there is another * error, the method will throw an java.io.IOException. <b>This is new to * v2.3!</b> In earlier versions, it just returned a null value, but in * retrospect that's a pretty poor way to handle it. * </p> * * The object is not GZip-compressed before being encoded. * <p> * Example options: * * <pre> * GZIP: gzip-compresses object before encoding it. * DO_BREAK_LINES: break lines at 76 characters * </pre> * <p> * Example: <code>encodeObject( myObj, Base64.GZIP )</code> or * <p> * Example: * <code>encodeObject( myObj, Base64.GZIP | Base64.DO_BREAK_LINES )</code> * * @param serializableObject * The object to encode * @param options * Specified options * @return The Base64-encoded object * @see Base64#GZIP * @see Base64#DO_BREAK_LINES * @throws java.io.IOException * if there is an error * @since 2.0 */ public static String encodeObject(java.io.Serializable serializableObject, int options) throws java.io.IOException { if (serializableObject == null) { throw new NullPointerException("Cannot serialize a null object."); } // end if: null // Streams java.io.ByteArrayOutputStream baos = null; java.io.OutputStream b64os = null; java.util.zip.GZIPOutputStream gzos = null; java.io.ObjectOutputStream oos = null; try { // ObjectOutputStream -> (GZIP) -> Base64 -> ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream(); b64os = new Base64.OutputStream(baos, ENCODE | options); if ((options & GZIP) != 0) { // Gzip gzos = new java.util.zip.GZIPOutputStream(b64os); oos = new java.io.ObjectOutputStream(gzos); } else { // Not gzipped oos = new java.io.ObjectOutputStream(b64os); } oos.writeObject(serializableObject); } // end try catch (java.io.IOException e) { // Catch it and then throw it immediately so that // the finally{} block is called for cleanup. throw e; } // end catch finally { try { oos.close(); } catch (Exception e) { } try { gzos.close(); } catch (Exception e) { } try { b64os.close(); } catch (Exception e) { } try { baos.close(); } catch (Exception e) { } } // end finally // Return value according to relevant encoding. try { return new String(baos.toByteArray(), PREFERRED_ENCODING); } // end try catch (java.io.UnsupportedEncodingException uue) { // Fall back to some Java default return new String(baos.toByteArray()); } // end catch } // end encode /** * Encodes a byte array into Base64 notation. Does not GZip-compress data. * * @param source * The data to convert * @return The data in Base64-encoded form * @throws NullPointerException * if source array is null * @since 1.4 */ public static String encodeBytes(byte[] source) { // Since we're not going to have the GZIP encoding turned on, // we're not going to have an java.io.IOException thrown, so // we should not force the user to have to catch it. String encoded = null; try { encoded = encodeBytes(source, 0, source.length, NO_OPTIONS); } catch (java.io.IOException ex) { assert false : ex.getMessage(); } // end catch assert encoded != null; return encoded; } // end encodeBytes /** * Encodes a byte array into Base64 notation. * <p> * Example options: * * <pre> * GZIP: gzip-compresses object before encoding it. * DO_BREAK_LINES: break lines at 76 characters * <i>Note: Technically, this makes your encoding non-compliant.</i> * </pre> * <p> * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or * <p> * Example: * <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code> * * * <p> * As of v 2.3, if there is an error with the GZIP stream, the method will * throw an java.io.IOException. <b>This is new to v2.3!</b> In earlier * versions, it just returned a null value, but in retrospect that's a * pretty poor way to handle it. * </p> * * * @param source * The data to convert * @param options * Specified options * @return The Base64-encoded data as a String * @see Base64#GZIP * @see Base64#DO_BREAK_LINES * @throws java.io.IOException * if there is an error * @throws NullPointerException * if source array is null * @since 2.0 */ public static String encodeBytes(byte[] source, int options) throws java.io.IOException { return encodeBytes(source, 0, source.length, options); } // end encodeBytes /** * Encodes a byte array into Base64 notation. Does not GZip-compress data. * * <p> * As of v 2.3, if there is an error, the method will throw an * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it * just returned a null value, but in retrospect that's a pretty poor way to * handle it. * </p> * * * @param source * The data to convert * @param off * Offset in array where conversion should begin * @param len * Length of data to convert * @return The Base64-encoded data as a String * @throws NullPointerException * if source array is null * @throws IllegalArgumentException * if source array, offset, or length are invalid * @since 1.4 */ public static String encodeBytes(byte[] source, int off, int len) { // Since we're not going to have the GZIP encoding turned on, // we're not going to have an java.io.IOException thrown, so // we should not force the user to have to catch it. String encoded = null; try { encoded = encodeBytes(source, off, len, NO_OPTIONS); } catch (java.io.IOException ex) { assert false : ex.getMessage(); } // end catch assert encoded != null; return encoded; } // end encodeBytes /** * Encodes a byte array into Base64 notation. * <p> * Example options: * * <pre> * GZIP: gzip-compresses object before encoding it. * DO_BREAK_LINES: break lines at 76 characters * <i>Note: Technically, this makes your encoding non-compliant.</i> * </pre> * <p> * Example: <code>encodeBytes( myData, Base64.GZIP )</code> or * <p> * Example: * <code>encodeBytes( myData, Base64.GZIP | Base64.DO_BREAK_LINES )</code> * * * <p> * As of v 2.3, if there is an error with the GZIP stream, the method will * throw an java.io.IOException. <b>This is new to v2.3!</b> In earlier * versions, it just returned a null value, but in retrospect that's a * pretty poor way to handle it. * </p> * * * @param source * The data to convert * @param off * Offset in array where conversion should begin * @param len * Length of data to convert * @param options * Specified options * @return The Base64-encoded data as a String * @see Base64#GZIP * @see Base64#DO_BREAK_LINES * @throws java.io.IOException * if there is an error * @throws NullPointerException * if source array is null * @throws IllegalArgumentException * if source array, offset, or length are invalid * @since 2.0 */ public static String encodeBytes(byte[] source, int off, int len, int options) throws java.io.IOException { byte[] encoded = encodeBytesToBytes(source, off, len, options); // Return value according to relevant encoding. try { return new String(encoded, PREFERRED_ENCODING); } // end try catch (java.io.UnsupportedEncodingException uue) { return new String(encoded); } // end catch } // end encodeBytes /** * Similar to {@link #encodeBytes(byte[])} but returns a byte array instead * of instantiating a String. This is more efficient if you're working with * I/O streams and have large data sets to encode. * * * @param source * The data to convert * @return The Base64-encoded data as a byte[] (of ASCII characters) * @throws NullPointerException * if source array is null * @since 2.3.1 */ public static byte[] encodeBytesToBytes(byte[] source) { byte[] encoded = null; try { encoded = encodeBytesToBytes(source, 0, source.length, Base64.NO_OPTIONS); } catch (java.io.IOException ex) { assert false : "IOExceptions only come from GZipping, which is turned off: " + ex.getMessage(); } return encoded; } /** * Similar to {@link #encodeBytes(byte[], int, int, int)} but returns a byte * array instead of instantiating a String. This is more efficient if you're * working with I/O streams and have large data sets to encode. * * * @param source * The data to convert * @param off * Offset in array where conversion should begin * @param len * Length of data to convert * @param options * Specified options * @return The Base64-encoded data as a String * @see Base64#GZIP * @see Base64#DO_BREAK_LINES * @throws java.io.IOException * if there is an error * @throws NullPointerException * if source array is null * @throws IllegalArgumentException * if source array, offset, or length are invalid * @since 2.3.1 */ public static byte[] encodeBytesToBytes(byte[] source, int off, int len, int options) throws java.io.IOException { if (source == null) { throw new NullPointerException("Cannot serialize a null array."); } // end if: null if (off < 0) { throw new IllegalArgumentException("Cannot have negative offset: " + off); } // end if: off < 0 if (len < 0) { throw new IllegalArgumentException("Cannot have length offset: " + len); } // end if: len < 0 if (off + len > source.length) { throw new IllegalArgumentException( String.format( "Cannot have offset of %d and length of %d with array of length %d", off, len, source.length)); } // end if: off < 0 // Compress? if ((options & GZIP) != 0) { java.io.ByteArrayOutputStream baos = null; java.util.zip.GZIPOutputStream gzos = null; Base64.OutputStream b64os = null; try { // GZip -> Base64 -> ByteArray baos = new java.io.ByteArrayOutputStream(); b64os = new Base64.OutputStream(baos, ENCODE | options); gzos = new java.util.zip.GZIPOutputStream(b64os); gzos.write(source, off, len); gzos.close(); } // end try catch (java.io.IOException e) { // Catch it and then throw it immediately so that // the finally{} block is called for cleanup. throw e; } // end catch finally { try { gzos.close(); } catch (Exception e) { } try { b64os.close(); } catch (Exception e) { } try { baos.close(); } catch (Exception e) { } } // end finally return baos.toByteArray(); } // end if: compress // Else, don't compress. Better not to use streams at all then. else { boolean breakLines = (options & DO_BREAK_LINES) != 0; // int len43 = len * 4 / 3; // byte[] outBuff = new byte[ ( len43 ) // Main 4:3 // + ( (len % 3) > 0 ? 4 : 0 ) // Account for padding // + (breakLines ? ( len43 / MAX_LINE_LENGTH ) : 0) ]; // New lines // Try to determine more precisely how big the array needs to be. // If we get it right, we don't have to do an array copy, and // we save a bunch of memory. int encLen = (len / 3) * 4 + (len % 3 > 0 ? 4 : 0); // Bytes needed // for actual // encoding if (breakLines) { encLen += encLen / MAX_LINE_LENGTH; // Plus extra newline // characters } byte[] outBuff = new byte[encLen]; int d = 0; int e = 0; int len2 = len - 2; int lineLength = 0; for (; d < len2; d += 3, e += 4) { encode3to4(source, d + off, 3, outBuff, e, options); lineLength += 4; if (breakLines && lineLength >= MAX_LINE_LENGTH) { outBuff[e + 4] = NEW_LINE; e++; lineLength = 0; } // end if: end of line } // en dfor: each piece of array if (d < len) { encode3to4(source, d + off, len - d, outBuff, e, options); e += 4; } // end if: some padding needed // Only resize array if we didn't guess it right. if (e <= outBuff.length - 1) { // If breaking lines and the last byte falls right at // the line length (76 bytes per line), there will be // one extra byte, and the array will need to be resized. // Not too bad of an estimate on array size, I'd say. byte[] finalOut = new byte[e]; System.arraycopy(outBuff, 0, finalOut, 0, e); // System.err.println("Having to resize array from " + // outBuff.length + " to " + e ); return finalOut; } else { // System.err.println("No need to resize array."); return outBuff; } } // end else: don't compress } // end encodeBytesToBytes /* ******** D E C O D I N G M E T H O D S ******** */ /** * Decodes four bytes from array <var>source</var> and writes the resulting * bytes (up to three of them) to <var>destination</var>. The source and * destination arrays can be manipulated anywhere along their length by * specifying <var>srcOffset</var> and <var>destOffset</var>. This method * does not check to make sure your arrays are large enough to accomodate * <var>srcOffset</var> + 4 for the <var>source</var> array or * <var>destOffset</var> + 3 for the <var>destination</var> array. This * method returns the actual number of bytes that were converted from the * Base64 encoding. * <p> * This is the lowest level of the decoding methods with all possible * parameters. * </p> * * * @param source * the array to convert * @param srcOffset * the index where conversion begins * @param destination * the array to hold the conversion * @param destOffset * the index where output will be put * @param options * alphabet type is pulled from this (standard, url-safe, * ordered) * @return the number of decoded bytes converted * @throws NullPointerException * if source or destination arrays are null * @throws IllegalArgumentException * if srcOffset or destOffset are invalid or there is not enough * room in the array. * @since 1.3 */ private static int decode4to3(byte[] source, int srcOffset, byte[] destination, int destOffset, int options) { // Lots of error checking and exception throwing if (source == null) { throw new NullPointerException("Source array was null."); } // end if if (destination == null) { throw new NullPointerException("Destination array was null."); } // end if if (srcOffset < 0 || srcOffset + 3 >= source.length) { throw new IllegalArgumentException( String.format( "Source array with length %d cannot have offset of %d and still process four bytes.", source.length, srcOffset)); } // end if if (destOffset < 0 || destOffset + 2 >= destination.length) { throw new IllegalArgumentException( String.format( "Destination array with length %d cannot have offset of %d and still store three bytes.", destination.length, destOffset)); } // end if byte[] DECODABET = getDecodabet(options); // Example: Dk== if (source[srcOffset + 2] == EQUALS_SIGN) { // Two ways to do the same thing. Don't know which way I like best. // int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 // ) // | ( ( DECODABET[ source[ srcOffset + 1] ] << 24 ) >>> 12 ); int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18) | ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12); destination[destOffset] = (byte) (outBuff >>> 16); return 1; } // Example: DkL= else if (source[srcOffset + 3] == EQUALS_SIGN) { // Two ways to do the same thing. Don't know which way I like best. // int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 // ) // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ); int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18) | ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12) | ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6); destination[destOffset] = (byte) (outBuff >>> 16); destination[destOffset + 1] = (byte) (outBuff >>> 8); return 2; } // Example: DkLE else { // Two ways to do the same thing. Don't know which way I like best. // int outBuff = ( ( DECODABET[ source[ srcOffset ] ] << 24 ) >>> 6 // ) // | ( ( DECODABET[ source[ srcOffset + 1 ] ] << 24 ) >>> 12 ) // | ( ( DECODABET[ source[ srcOffset + 2 ] ] << 24 ) >>> 18 ) // | ( ( DECODABET[ source[ srcOffset + 3 ] ] << 24 ) >>> 24 ); int outBuff = ((DECODABET[source[srcOffset]] & 0xFF) << 18) | ((DECODABET[source[srcOffset + 1]] & 0xFF) << 12) | ((DECODABET[source[srcOffset + 2]] & 0xFF) << 6) | ((DECODABET[source[srcOffset + 3]] & 0xFF)); destination[destOffset] = (byte) (outBuff >> 16); destination[destOffset + 1] = (byte) (outBuff >> 8); destination[destOffset + 2] = (byte) (outBuff); return 3; } } // end decodeToBytes /** * Low-level access to decoding ASCII characters in the form of a byte * array. <strong>Ignores GUNZIP option, if it's set.</strong> This is not * generally a recommended method, although it is used internally as part of * the decoding process. Special case: if len = 0, an empty array is * returned. Still, if you need more speed and reduced memory footprint (and * aren't gzipping), consider this method. * * @param source * The Base64 encoded data * @return decoded data * @since 2.3.1 */ public static byte[] decode(byte[] source) throws java.io.IOException { byte[] decoded = null; // try { decoded = decode(source, 0, source.length, Base64.NO_OPTIONS); // } catch( java.io.IOException ex ) { // assert false : // "IOExceptions only come from GZipping, which is turned off: " + // ex.getMessage(); // } return decoded; } /** * Low-level access to decoding ASCII characters in the form of a byte * array. <strong>Ignores GUNZIP option, if it's set.</strong> This is not * generally a recommended method, although it is used internally as part of * the decoding process. Special case: if len = 0, an empty array is * returned. Still, if you need more speed and reduced memory footprint (and * aren't gzipping), consider this method. * * @param source * The Base64 encoded data * @param off * The offset of where to begin decoding * @param len * The length of characters to decode * @param options * Can specify options such as alphabet type to use * @return decoded data * @throws java.io.IOException * If bogus characters exist in source data * @since 1.3 */ public static byte[] decode(byte[] source, int off, int len, int options) throws java.io.IOException { // Lots of error checking and exception throwing if (source == null) { throw new NullPointerException("Cannot decode null source array."); } // end if if (off < 0 || off + len > source.length) { throw new IllegalArgumentException( String.format( "Source array with length %d cannot have offset of %d and process %d bytes.", source.length, off, len)); } // end if if (len == 0) { return new byte[0]; } else if (len < 4) { throw new IllegalArgumentException( "Base64-encoded string must have at least four characters, but length specified was " + len); } // end if byte[] DECODABET = getDecodabet(options); int len34 = len * 3 / 4; // Estimate on array size byte[] outBuff = new byte[len34]; // Upper limit on size of output int outBuffPosn = 0; // Keep track of where we're writing byte[] b4 = new byte[4]; // Four byte buffer from source, eliminating // white space int b4Posn = 0; // Keep track of four byte input buffer int i = 0; // Source array counter byte sbiDecode = 0; // Special value from DECODABET for (i = off; i < off + len; i++) { // Loop through source sbiDecode = DECODABET[source[i] & 0xFF]; // White space, Equals sign, or legit Base64 character // Note the values such as -5 and -9 in the // DECODABETs at the top of the file. if (sbiDecode >= WHITE_SPACE_ENC) { if (sbiDecode >= EQUALS_SIGN_ENC) { b4[b4Posn++] = source[i]; // Save non-whitespace if (b4Posn > 3) { // Time to decode? outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn, options); b4Posn = 0; // If that was the equals sign, break out of 'for' loop if (source[i] == EQUALS_SIGN) { break; } // end if: equals sign } // end if: quartet built } // end if: equals sign or better } // end if: white space, equals sign or better else { // There's a bad input character in the Base64 stream. throw new java.io.IOException( String.format( "Bad Base64 input character decimal %d in array position %d", ((int) source[i]) & 0xFF, i)); } // end else: } // each input character byte[] out = new byte[outBuffPosn]; System.arraycopy(outBuff, 0, out, 0, outBuffPosn); return out; } // end decode /** * Decodes data from Base64 notation, automatically detecting * gzip-compressed data and decompressing it. * * @param s * the string to decode * @return the decoded data * @throws java.io.IOException * If there is a problem * @since 1.4 */ public static byte[] decode(String s) throws java.io.IOException { return decode(s, NO_OPTIONS); } /** * Decodes data from Base64 notation, automatically detecting * gzip-compressed data and decompressing it. * * @param s * the string to decode * @param options * encode options such as URL_SAFE * @return the decoded data * @throws java.io.IOException * if there is an error * @throws NullPointerException * if <tt>s</tt> is null * @since 1.4 */ public static byte[] decode(String s, int options) throws java.io.IOException { if (s == null) { throw new NullPointerException("Input string was null."); } // end if byte[] bytes; try { bytes = s.getBytes(PREFERRED_ENCODING); } // end try catch (java.io.UnsupportedEncodingException uee) { bytes = s.getBytes(); } // end catch // </change> // Decode bytes = decode(bytes, 0, bytes.length, options); // Check to see if it's gzip-compressed // GZIP Magic Two-Byte Number: 0x8b1f (35615) boolean dontGunzip = (options & DONT_GUNZIP) != 0; if ((bytes != null) && (bytes.length >= 4) && (!dontGunzip)) { int head = ((int) bytes[0] & 0xff) | ((bytes[1] << 8) & 0xff00); if (java.util.zip.GZIPInputStream.GZIP_MAGIC == head) { java.io.ByteArrayInputStream bais = null; java.util.zip.GZIPInputStream gzis = null; java.io.ByteArrayOutputStream baos = null; byte[] buffer = new byte[2048]; int length = 0; try { baos = new java.io.ByteArrayOutputStream(); bais = new java.io.ByteArrayInputStream(bytes); gzis = new java.util.zip.GZIPInputStream(bais); while ((length = gzis.read(buffer)) >= 0) { baos.write(buffer, 0, length); } // end while: reading input // No error? Get new bytes. bytes = baos.toByteArray(); } // end try catch (java.io.IOException e) { e.printStackTrace(); // Just return originally-decoded bytes } // end catch finally { try { baos.close(); } catch (Exception e) { } try { gzis.close(); } catch (Exception e) { } try { bais.close(); } catch (Exception e) { } } // end finally } // end if: gzipped } // end if: bytes.length >= 2 return bytes; } // end decode /** * Attempts to decode Base64 data and deserialize a Java Object within. * Returns <tt>null</tt> if there was an error. * * @param encodedObject * The Base64 data to decode * @return The decoded and deserialized object * @throws NullPointerException * if encodedObject is null * @throws java.io.IOException * if there is a general error * @throws ClassNotFoundException * if the decoded object is of a class that cannot be found by * the JVM * @since 1.5 */ public static Object decodeToObject(String encodedObject) throws java.io.IOException, java.lang.ClassNotFoundException { return decodeToObject(encodedObject, NO_OPTIONS, null); } /** * Attempts to decode Base64 data and deserialize a Java Object within. * Returns <tt>null</tt> if there was an error. If <tt>loader</tt> is not * null, it will be the class loader used when deserializing. * * @param encodedObject * The Base64 data to decode * @param options * Various parameters related to decoding * @param loader * Optional class loader to use in deserializing classes. * @return The decoded and deserialized object * @throws NullPointerException * if encodedObject is null * @throws java.io.IOException * if there is a general error * @throws ClassNotFoundException * if the decoded object is of a class that cannot be found by * the JVM * @since 2.3.4 */ public static Object decodeToObject(String encodedObject, int options, final ClassLoader loader) throws java.io.IOException, java.lang.ClassNotFoundException { // Decode and gunzip if necessary byte[] objBytes = decode(encodedObject, options); java.io.ByteArrayInputStream bais = null; java.io.ObjectInputStream ois = null; Object obj = null; try { bais = new java.io.ByteArrayInputStream(objBytes); // If no custom class loader is provided, use Java's builtin OIS. if (loader == null) { ois = new java.io.ObjectInputStream(bais); } // end if: no loader provided // Else make a customized object input stream that uses // the provided class loader. else { ois = new java.io.ObjectInputStream(bais) { @Override public Class<?> resolveClass( java.io.ObjectStreamClass streamClass) throws java.io.IOException, ClassNotFoundException { Class<?> c = Class.forName(streamClass.getName(), false, loader); if (c == null) { return super.resolveClass(streamClass); } else { return c; // Class loader knows of this class. } // end else: not null } // end resolveClass }; // end ois } // end else: no custom class loader obj = ois.readObject(); } // end try catch (java.io.IOException e) { throw e; // Catch and throw in order to execute finally{} } // end catch catch (java.lang.ClassNotFoundException e) { throw e; // Catch and throw in order to execute finally{} } // end catch finally { try { bais.close(); } catch (Exception e) { } try { ois.close(); } catch (Exception e) { } } // end finally return obj; } // end decodeObject /** * Convenience method for encoding data to a file. * * <p> * As of v 2.3, if there is a error, the method will throw an * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it * just returned false, but in retrospect that's a pretty poor way to handle * it. * </p> * * @param dataToEncode * byte array of data to encode in base64 form * @param filename * Filename for saving encoded data * @throws java.io.IOException * if there is an error * @throws NullPointerException * if dataToEncode is null * @since 2.1 */ public static void encodeToFile(byte[] dataToEncode, String filename) throws java.io.IOException { if (dataToEncode == null) { throw new NullPointerException("Data to encode was null."); } // end iff Base64.OutputStream bos = null; try { bos = new Base64.OutputStream( new java.io.FileOutputStream(filename), Base64.ENCODE); bos.write(dataToEncode); } // end try catch (java.io.IOException e) { throw e; // Catch and throw to execute finally{} block } // end catch: java.io.IOException finally { try { bos.close(); } catch (Exception e) { } } // end finally } // end encodeToFile /** * Convenience method for decoding data to a file. * * <p> * As of v 2.3, if there is a error, the method will throw an * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it * just returned false, but in retrospect that's a pretty poor way to handle * it. * </p> * * @param dataToDecode * Base64-encoded data as a string * @param filename * Filename for saving decoded data * @throws java.io.IOException * if there is an error * @since 2.1 */ public static void decodeToFile(String dataToDecode, String filename) throws java.io.IOException { Base64.OutputStream bos = null; try { bos = new Base64.OutputStream( new java.io.FileOutputStream(filename), Base64.DECODE); bos.write(dataToDecode.getBytes(PREFERRED_ENCODING)); } // end try catch (java.io.IOException e) { throw e; // Catch and throw to execute finally{} block } // end catch: java.io.IOException finally { try { bos.close(); } catch (Exception e) { } } // end finally } // end decodeToFile /** * Convenience method for reading a base64-encoded file and decoding it. * * <p> * As of v 2.3, if there is a error, the method will throw an * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it * just returned false, but in retrospect that's a pretty poor way to handle * it. * </p> * * @param filename * Filename for reading encoded data * @return decoded byte array * @throws java.io.IOException * if there is an error * @since 2.1 */ public static byte[] decodeFromFile(String filename) throws java.io.IOException { byte[] decodedData = null; Base64.InputStream bis = null; try { // Set up some useful variables java.io.File file = new java.io.File(filename); byte[] buffer = null; int length = 0; int numBytes = 0; // Check for size of file if (file.length() > Integer.MAX_VALUE) { throw new java.io.IOException( "File is too big for this convenience method (" + file.length() + " bytes)."); } // end if: file too big for int index buffer = new byte[(int) file.length()]; // Open a stream bis = new Base64.InputStream(new java.io.BufferedInputStream( new java.io.FileInputStream(file)), Base64.DECODE); // Read until done while ((numBytes = bis.read(buffer, length, 4096)) >= 0) { length += numBytes; } // end while // Save in a variable to return decodedData = new byte[length]; System.arraycopy(buffer, 0, decodedData, 0, length); } // end try catch (java.io.IOException e) { throw e; // Catch and release to execute finally{} } // end catch: java.io.IOException finally { try { bis.close(); } catch (Exception e) { } } // end finally return decodedData; } // end decodeFromFile /** * Convenience method for reading a binary file and base64-encoding it. * * <p> * As of v 2.3, if there is a error, the method will throw an * java.io.IOException. <b>This is new to v2.3!</b> In earlier versions, it * just returned false, but in retrospect that's a pretty poor way to handle * it. * </p> * * @param filename * Filename for reading binary data * @return base64-encoded string * @throws java.io.IOException * if there is an error * @since 2.1 */ public static String encodeFromFile(String filename) throws java.io.IOException { String encodedData = null; Base64.InputStream bis = null; try { // Set up some useful variables java.io.File file = new java.io.File(filename); byte[] buffer = new byte[Math.max((int) (file.length() * 1.4 + 1), 40)]; // Need max() for math on small files (v2.2.1); Need // +1 for a few corner cases (v2.3.5) int length = 0; int numBytes = 0; // Open a stream bis = new Base64.InputStream(new java.io.BufferedInputStream( new java.io.FileInputStream(file)), Base64.ENCODE); // Read until done while ((numBytes = bis.read(buffer, length, 4096)) >= 0) { length += numBytes; } // end while // Save in a variable to return encodedData = new String(buffer, 0, length, Base64.PREFERRED_ENCODING); } // end try catch (java.io.IOException e) { throw e; // Catch and release to execute finally{} } // end catch: java.io.IOException finally { try { bis.close(); } catch (Exception e) { } } // end finally return encodedData; } // end encodeFromFile /** * Reads <tt>infile</tt> and encodes it to <tt>outfile</tt>. * * @param infile * Input file * @param outfile * Output file * @throws java.io.IOException * if there is an error * @since 2.2 */ public static void encodeFileToFile(String infile, String outfile) throws java.io.IOException { String encoded = Base64.encodeFromFile(infile); java.io.OutputStream out = null; try { out = new java.io.BufferedOutputStream( new java.io.FileOutputStream(outfile)); out.write(encoded.getBytes("US-ASCII")); // Strict, 7-bit output. } // end try catch (java.io.IOException e) { throw e; // Catch and release to execute finally{} } // end catch finally { try { out.close(); } catch (Exception ex) { } } // end finally } // end encodeFileToFile /** * Reads <tt>infile</tt> and decodes it to <tt>outfile</tt>. * * @param infile * Input file * @param outfile * Output file * @throws java.io.IOException * if there is an error * @since 2.2 */ public static void decodeFileToFile(String infile, String outfile) throws java.io.IOException { byte[] decoded = Base64.decodeFromFile(infile); java.io.OutputStream out = null; try { out = new java.io.BufferedOutputStream( new java.io.FileOutputStream(outfile)); out.write(decoded); } // end try catch (java.io.IOException e) { throw e; // Catch and release to execute finally{} } // end catch finally { try { out.close(); } catch (Exception ex) { } } // end finally } // end decodeFileToFile /* ******** I N N E R C L A S S I N P U T S T R E A M ******** */ /** * A {@link Base64.InputStream} will read data from another * <tt>java.io.InputStream</tt>, given in the constructor, and encode/decode * to/from Base64 notation on the fly. * * @see Base64 * @since 1.3 */ public static class InputStream extends java.io.FilterInputStream { private boolean encode; // Encoding or decoding private int position; // Current position in the buffer private byte[] buffer; // Small buffer holding converted data private int bufferLength; // Length of buffer (3 or 4) private int numSigBytes; // Number of meaningful bytes in the buffer private int lineLength; private boolean breakLines; // Break lines at less than 80 characters private int options; // Record options used to create the stream. private byte[] decodabet; // Local copies to avoid extra method calls /** * Constructs a {@link Base64.InputStream} in DECODE mode. * * @param in * the <tt>java.io.InputStream</tt> from which to read data. * @since 1.3 */ public InputStream(java.io.InputStream in) { this(in, DECODE); } // end constructor /** * Constructs a {@link Base64.InputStream} in either ENCODE or DECODE * mode. * <p> * Valid options: * * <pre> * ENCODE or DECODE: Encode or Decode as data is read. * DO_BREAK_LINES: break lines at 76 characters * (only meaningful when encoding)</i> * </pre> * <p> * Example: <code>new Base64.InputStream( in, Base64.DECODE )</code> * * * @param in * the <tt>java.io.InputStream</tt> from which to read data. * @param options * Specified options * @see Base64#ENCODE * @see Base64#DECODE * @see Base64#DO_BREAK_LINES * @since 2.0 */ public InputStream(java.io.InputStream in, int options) { super(in); this.options = options; // Record for later this.breakLines = (options & DO_BREAK_LINES) > 0; this.encode = (options & ENCODE) > 0; this.bufferLength = encode ? 4 : 3; this.buffer = new byte[bufferLength]; this.position = -1; this.lineLength = 0; this.decodabet = getDecodabet(options); } // end constructor /** * Reads enough of the input stream to convert to/from Base64 and * returns the next byte. * * @return next byte * @since 1.3 */ @Override public int read() throws java.io.IOException { // Do we need to get data? if (position < 0) { if (encode) { byte[] b3 = new byte[3]; int numBinaryBytes = 0; for (int i = 0; i < 3; i++) { int b = in.read(); // If end of stream, b is -1. if (b >= 0) { b3[i] = (byte) b; numBinaryBytes++; } else { break; // out of for loop } // end else: end of stream } // end for: each needed input byte if (numBinaryBytes > 0) { encode3to4(b3, 0, numBinaryBytes, buffer, 0, options); position = 0; numSigBytes = 4; } // end if: got data else { return -1; // Must be end of stream } // end else } // end if: encoding // Else decoding else { byte[] b4 = new byte[4]; int i = 0; for (i = 0; i < 4; i++) { // Read four "meaningful" bytes: int b = 0; do { b = in.read(); } while (b >= 0 && decodabet[b & 0x7f] <= WHITE_SPACE_ENC); if (b < 0) { break; // Reads a -1 if end of stream } // end if: end of stream b4[i] = (byte) b; } // end for: each needed input byte if (i == 4) { numSigBytes = decode4to3(b4, 0, buffer, 0, options); position = 0; } // end if: got four characters else if (i == 0) { return -1; } // end else if: also padded correctly else { // Must have broken out from above. throw new java.io.IOException( "Improperly padded Base64 input."); } // end } // end else: decode } // end else: get data // Got data? if (position >= 0) { // End of relevant data? if ( /* !encode && */position >= numSigBytes) { return -1; } // end if: got data if (encode && breakLines && lineLength >= MAX_LINE_LENGTH) { lineLength = 0; return '\n'; } // end if else { lineLength++; // This isn't important when decoding // but throwing an extra "if" seems // just as wasteful. int b = buffer[position++]; if (position >= bufferLength) { position = -1; } // end if: end return b & 0xFF; // This is how you "cast" a byte that's // intended to be unsigned. } // end else } // end if: position >= 0 // Else error else { throw new java.io.IOException( "Error in Base64 code reading stream."); } // end else } // end read /** * Calls {@link #read()} repeatedly until the end of stream is reached * or <var>len</var> bytes are read. Returns number of bytes read into * array or -1 if end of stream is encountered. * * @param dest * array to hold values * @param off * offset for array * @param len * max number of bytes to read into array * @return bytes read into array or -1 if end of stream is encountered. * @since 1.3 */ @Override public int read(byte[] dest, int off, int len) throws java.io.IOException { int i; int b; for (i = 0; i < len; i++) { b = read(); if (b >= 0) { dest[off + i] = (byte) b; } else if (i == 0) { return -1; } else { break; // Out of 'for' loop } // Out of 'for' loop } // end for: each byte read return i; } // end read } // end inner class InputStream /* ******** I N N E R C L A S S O U T P U T S T R E A M ******** */ /** * A {@link Base64.OutputStream} will write data to another * <tt>java.io.OutputStream</tt>, given in the constructor, and * encode/decode to/from Base64 notation on the fly. * * @see Base64 * @since 1.3 */ public static class OutputStream extends java.io.FilterOutputStream { private boolean encode; private int position; private byte[] buffer; private int bufferLength; private int lineLength; private boolean breakLines; private byte[] b4; // Scratch used in a few places private boolean suspendEncoding; private int options; // Record for later private byte[] decodabet; // Local copies to avoid extra method calls /** * Constructs a {@link Base64.OutputStream} in ENCODE mode. * * @param out * the <tt>java.io.OutputStream</tt> to which data will be * written. * @since 1.3 */ public OutputStream(java.io.OutputStream out) { this(out, ENCODE); } // end constructor /** * Constructs a {@link Base64.OutputStream} in either ENCODE or DECODE * mode. * <p> * Valid options: * * <pre> * ENCODE or DECODE: Encode or Decode as data is read. * DO_BREAK_LINES: don't break lines at 76 characters * (only meaningful when encoding)</i> * </pre> * <p> * Example: <code>new Base64.OutputStream( out, Base64.ENCODE )</code> * * @param out * the <tt>java.io.OutputStream</tt> to which data will be * written. * @param options * Specified options. * @see Base64#ENCODE * @see Base64#DECODE * @see Base64#DO_BREAK_LINES * @since 1.3 */ public OutputStream(java.io.OutputStream out, int options) { super(out); this.breakLines = (options & DO_BREAK_LINES) != 0; this.encode = (options & ENCODE) != 0; this.bufferLength = encode ? 3 : 4; this.buffer = new byte[bufferLength]; this.position = 0; this.lineLength = 0; this.suspendEncoding = false; this.b4 = new byte[4]; this.options = options; this.decodabet = getDecodabet(options); } // end constructor /** * Writes the byte to the output stream after converting to/from Base64 * notation. When encoding, bytes are buffered three at a time before * the output stream actually gets a write() call. When decoding, bytes * are buffered four at a time. * * @param theByte * the byte to write * @since 1.3 */ @Override public void write(int theByte) throws java.io.IOException { // Encoding suspended? if (suspendEncoding) { this.out.write(theByte); return; } // end if: supsended // Encode? if (encode) { buffer[position++] = (byte) theByte; if (position >= bufferLength) { // Enough to encode. this.out.write(encode3to4(b4, buffer, bufferLength, options)); lineLength += 4; if (breakLines && lineLength >= MAX_LINE_LENGTH) { this.out.write(NEW_LINE); lineLength = 0; } // end if: end of line position = 0; } // end if: enough to output } // end if: encoding // Else, Decoding else { // Meaningful Base64 character? if (decodabet[theByte & 0x7f] > WHITE_SPACE_ENC) { buffer[position++] = (byte) theByte; if (position >= bufferLength) { // Enough to output. int len = Base64.decode4to3(buffer, 0, b4, 0, options); out.write(b4, 0, len); position = 0; } // end if: enough to output } // end if: meaningful base64 character else if (decodabet[theByte & 0x7f] != WHITE_SPACE_ENC) { throw new java.io.IOException( "Invalid character in Base64 data."); } // end else: not white space either } // end else: decoding } // end write /** * Calls {@link #write(int)} repeatedly until <var>len</var> bytes are * written. * * @param theBytes * array from which to read bytes * @param off * offset for array * @param len * max number of bytes to read into array * @since 1.3 */ @Override public void write(byte[] theBytes, int off, int len) throws java.io.IOException { // Encoding suspended? if (suspendEncoding) { this.out.write(theBytes, off, len); return; } // end if: supsended for (int i = 0; i < len; i++) { write(theBytes[off + i]); } // end for: each byte written } // end write /** * Method added by PHIL. [Thanks, PHIL. -Rob] This pads the buffer * without closing the stream. * * @throws java.io.IOException * if there's an error. */ public void flushBase64() throws java.io.IOException { if (position > 0) { if (encode) { out.write(encode3to4(b4, buffer, position, options)); position = 0; } // end if: encoding else { throw new java.io.IOException( "Base64 input not properly padded."); } // end else: decoding } // end if: buffer partially full } // end flush /** * Flushes and closes (I think, in the superclass) the stream. * * @since 1.3 */ @Override public void close() throws java.io.IOException { // 1. Ensure that pending characters are written flushBase64(); // 2. Actually close the stream // Base class both flushes and closes. super.close(); buffer = null; out = null; } // end close /** * Suspends encoding of the stream. May be helpful if you need to embed * a piece of base64-encoded data in a stream. * * @throws java.io.IOException * if there's an error flushing * @since 1.5.1 */ public void suspendEncoding() throws java.io.IOException { flushBase64(); this.suspendEncoding = true; } // end suspendEncoding /** * Resumes encoding of the stream. May be helpful if you need to embed a * piece of base64-encoded data in a stream. * * @since 1.5.1 */ public void resumeEncoding() { this.suspendEncoding = false; } // end resumeEncoding } // end inner class OutputStream } // end class Base64
