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Diffstat (limited to 'libjava/classpath/gnu/java/security/util/Base64.java')
| -rw-r--r-- | libjava/classpath/gnu/java/security/util/Base64.java | 349 |
1 files changed, 0 insertions, 349 deletions
diff --git a/libjava/classpath/gnu/java/security/util/Base64.java b/libjava/classpath/gnu/java/security/util/Base64.java deleted file mode 100644 index 9b2ae12dc27..00000000000 --- a/libjava/classpath/gnu/java/security/util/Base64.java +++ /dev/null @@ -1,349 +0,0 @@ -/* Base64.java -- - Copyright (C) 2003, 2006 Free Software Foundation, Inc. - -This file is a part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2 of the License, or (at -your option) any later version. - -GNU Classpath is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; if not, write to the Free Software -Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 -USA - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - - -package gnu.java.security.util; - -import gnu.java.security.Configuration; - -import java.io.UnsupportedEncodingException; -import java.util.logging.Logger; - -/** - * Most of this implementation is from Robert Harder's public domain Base64 - * code (version 1.4.1 available from <http://iharder.net/xmlizable>). - */ -public class Base64 -{ - private static final Logger log = Logger.getLogger(Base64.class.getName()); - - /** Maximum line length (76) of Base64 output. */ - private static final int MAX_LINE_LENGTH = 76; - - /** The new line character (\n) as one byte. */ - private static final byte NEW_LINE = (byte) '\n'; - - /** The equals sign (=) as a byte. */ - private static final byte EQUALS_SIGN = (byte) '='; - - private static final byte WHITE_SPACE_ENC = -5; // white space in encoding - - private static final byte EQUALS_SIGN_ENC = -1; // equals sign in encoding - - /** The 64 valid Base64 values. */ - private static final byte[] 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 static final byte[] 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 // Decimal 123 - 126 - }; - - /** Trivial private ctor to enfore Singleton pattern. */ - private Base64() - { - super(); - } - - /** - * Encodes a byte array into Base64 notation. Equivalent to calling - * <code>encode(source, 0, source.length)</code>. - * - * @param src the data to convert. - */ - public static final String encode(final byte[] src) - { - return encode(src, 0, src.length, true); - } - - /** - * Encodes a byte array into Base64 notation. - * - * @param src the data to convert. - * @param off offset in array where conversion should begin. - * @param len length of data to convert. - * @param breakLines break lines at 80 characters or less. - */ - public static final String encode(final byte[] src, final int off, - final int len, final boolean breakLines) - { - final int len43 = len * 4 / 3; - final byte[] outBuff = new byte[len43 // Main 4:3 - + ((len % 3) > 0 ? 4 : 0) // Account for padding - + (breakLines ? (len43 / MAX_LINE_LENGTH) - : 0)]; // New lines - int d = 0; - int e = 0; - final int len2 = len - 2; - int lineLength = 0; - for (; d < len2; d += 3, e += 4) - { - encode3to4(src, d + off, 3, outBuff, e); - lineLength += 4; - if (breakLines && lineLength == MAX_LINE_LENGTH) - { - outBuff[e + 4] = NEW_LINE; - e++; - lineLength = 0; - } - } - if (d < len) // padding needed - { - encode3to4(src, d + off, len - d, outBuff, e); - e += 4; - } - return new String(outBuff, 0, e); - } - - /** - * Decodes data from Base64 notation. - * - * @param s the string to decode. - * @return the decoded data. - */ - public static final byte[] decode(final String s) - throws UnsupportedEncodingException - { - final byte[] bytes; - bytes = s.getBytes("US-ASCII"); - return decode(bytes, 0, bytes.length); - } - - /** - * Decodes Base64 content in byte array format and returns the decoded byte - * array. - * - * @param src the Base64 encoded data. - * @param off the offset of where to begin decoding. - * @param len the length of characters to decode. - * @return the decoded data. - * @throws IllegalArgumentException if <code>src</code> contains an illegal - * Base-64 character. - */ - public static byte[] decode(final byte[] src, final int off, final int len) - { - final int len34 = len * 3 / 4; - final byte[] outBuff = new byte[len34]; // Upper limit on size of output - int outBuffPosn = 0; - final byte[] b4 = new byte[4]; - int b4Posn = 0; - int i; - byte sbiCrop, sbiDecode; - for (i = off; i < off + len; i++) - { - sbiCrop = (byte) (src[i] & 0x7F); // Only the low seven bits - sbiDecode = DECODABET[sbiCrop]; - if (sbiDecode >= WHITE_SPACE_ENC) - { // White space, Equals sign or better - if (sbiDecode >= EQUALS_SIGN_ENC) - { - b4[b4Posn++] = sbiCrop; - if (b4Posn > 3) - { - outBuffPosn += decode4to3(b4, 0, outBuff, outBuffPosn); - b4Posn = 0; - // If that was the equals sign, break out of 'for' loop - if (sbiCrop == EQUALS_SIGN) - break; - } // end if: quartet built - } // end if: equals sign or better - } - throw new IllegalArgumentException("Illegal BASE-64 character at #" - + i + ": " + src[i] + "(decimal)"); - } - final byte[] result = new byte[outBuffPosn]; - System.arraycopy(outBuff, 0, result, 0, outBuffPosn); - return result; - } - - /** - * Encodes up to three bytes of the array <code>src</code> and writes the - * resulting four Base64 bytes to <code>dest</code>. The source and - * destination arrays can be manipulated anywhere along their length by - * specifying <code>sOffset</code> and <code>dOffset</code>. - * <p> - * This method does not check to make sure the arrays are large enough to - * accomodate <code>sOffset + 3</code> for the <code>src</code> array or - * <code>dOffset + 4</code> for the <code>dest</code> array. The actual - * number of significant bytes in the input array is given by - * <code>numBytes</code>. - * - * @param src the array to convert. - * @param sOffset the index where conversion begins. - * @param numBytes the number of significant bytes in your array. - * @param dest the array to hold the conversion. - * @param dOffset the index where output will be put. - * @return the <code>destination</code> array. - */ - private static final byte[] encode3to4(final byte[] src, final int sOffset, - final int numBytes, final byte[] dest, - final int dOffset) - { - // 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. - final int inBuff = (numBytes > 0 ? ((src[sOffset] << 24) >>> 8) : 0) - | (numBytes > 1 ? ((src[sOffset + 1] << 24) >>> 16) : 0) - | (numBytes > 2 ? ((src[sOffset + 2] << 24) >>> 24) : 0); - switch (numBytes) - { - case 3: - dest[dOffset ] = ALPHABET[(inBuff >>> 18)]; - dest[dOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3F]; - dest[dOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3F]; - dest[dOffset + 3] = ALPHABET[(inBuff) & 0x3F]; - break; - case 2: - dest[dOffset ] = ALPHABET[(inBuff >>> 18)]; - dest[dOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3F]; - dest[dOffset + 2] = ALPHABET[(inBuff >>> 6) & 0x3F]; - dest[dOffset + 3] = EQUALS_SIGN; - break; - case 1: - dest[dOffset ] = ALPHABET[(inBuff >>> 18)]; - dest[dOffset + 1] = ALPHABET[(inBuff >>> 12) & 0x3F]; - dest[dOffset + 2] = EQUALS_SIGN; - dest[dOffset + 3] = EQUALS_SIGN; - break; - } - return dest; - } - - /** - * Decodes four bytes from array <code>src</code> and writes the resulting - * bytes (up to three of them) to <code>dest</code>. - * <p> - * The source and destination arrays can be manipulated anywhere along their - * length by specifying <code>sOffset</code> and <code>dOffset</code>. - * <p> - * This method does not check to make sure your arrays are large enough to - * accomodate <code>sOffset + 4</code> for the <code>src</code> array or - * <code>dOffset + 3</code> for the <code>dest</code> array. This method - * returns the actual number of bytes that were converted from the Base64 - * encoding. - * - * @param src the array to convert. - * @param sOffset the index where conversion begins. - * @param dest the array to hold the conversion. - * @param dOffset the index where output will be put. - * @return the number of decoded bytes converted. - */ - private static final int decode4to3(final byte[] src, final int sOffset, - final byte[] dest, final int dOffset) - { - if (src[sOffset + 2] == EQUALS_SIGN) // Example: Dk== - { - final int outBuff = ((DECODABET[src[sOffset ]] & 0xFF) << 18) - | ((DECODABET[src[sOffset + 1]] & 0xFF) << 12); - dest[dOffset] = (byte)(outBuff >>> 16); - return 1; - } - if (src[sOffset + 3] == EQUALS_SIGN) // Example: DkL= - { - final int outBuff = ((DECODABET[src[sOffset ]] & 0xFF) << 18) - | ((DECODABET[src[sOffset + 1]] & 0xFF) << 12) - | ((DECODABET[src[sOffset + 2]] & 0xFF) << 6); - dest[dOffset ] = (byte)(outBuff >>> 16); - dest[dOffset + 1] = (byte)(outBuff >>> 8); - return 2; - } - try // Example: DkLE - { - final int outBuff = ((DECODABET[src[sOffset ]] & 0xFF) << 18) - | ((DECODABET[src[sOffset + 1]] & 0xFF) << 12) - | ((DECODABET[src[sOffset + 2]] & 0xFF) << 6) - | ((DECODABET[src[sOffset + 3]] & 0xFF)); - dest[dOffset ] = (byte)(outBuff >> 16); - dest[dOffset + 1] = (byte)(outBuff >> 8); - dest[dOffset + 2] = (byte) outBuff; - return 3; - } - catch (Exception x) - { - if (Configuration.DEBUG) - { - log.fine("" + src[sOffset ] + ": " + (DECODABET[src[sOffset ]])); - log.fine("" + src[sOffset + 1] + ": " + (DECODABET[src[sOffset + 1]])); - log.fine("" + src[sOffset + 2] + ": " + (DECODABET[src[sOffset + 2]])); - log.fine("" + src[sOffset + 3] + ": " + (DECODABET[src[sOffset + 3]])); - } - return -1; - } - } -} |
