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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/java/security/x509/Util.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/java/security/x509/Util.java | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/security/x509/Util.java b/gcc-4.4.3/libjava/classpath/gnu/java/security/x509/Util.java new file mode 100644 index 000000000..7b6c89f6a --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/java/security/x509/Util.java @@ -0,0 +1,204 @@ +/* Util.java -- Miscellaneous utility methods. + Copyright (C) 2004, 2006 Free Software Foundation, Inc. + +This file is 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, 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; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, 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.x509; + +import gnu.java.lang.CPStringBuilder; + +/** + * A collection of useful class methods. + * + * @author Casey Marshall (rsdio@metastatic.org) + */ +public final class Util +{ + + // Constants. + // ------------------------------------------------------------------------- + + public static final String HEX = "0123456789abcdef"; + + // Class methods. + // ------------------------------------------------------------------------- + + /** + * Convert a byte array to a hexadecimal string, as though it were a + * big-endian arbitrarily-sized integer. + * + * @param buf The bytes to format. + * @param off The offset to start at. + * @param len The number of bytes to format. + * @return A hexadecimal representation of the specified bytes. + */ + public static String toHexString(byte[] buf, int off, int len) + { + CPStringBuilder str = new CPStringBuilder(); + for (int i = 0; i < len; i++) + { + str.append(HEX.charAt(buf[i+off] >>> 4 & 0x0F)); + str.append(HEX.charAt(buf[i+off] & 0x0F)); + } + return str.toString(); + } + + /** + * See {@link #toHexString(byte[],int,int)}. + */ + public static String toHexString(byte[] buf) + { + return Util.toHexString(buf, 0, buf.length); + } + + /** + * Convert a byte array to a hexadecimal string, separating octets + * with the given character. + * + * @param buf The bytes to format. + * @param off The offset to start at. + * @param len The number of bytes to format. + * @param sep The character to insert between octets. + * @return A hexadecimal representation of the specified bytes. + */ + public static String toHexString(byte[] buf, int off, int len, char sep) + { + CPStringBuilder str = new CPStringBuilder(); + for (int i = 0; i < len; i++) + { + str.append(HEX.charAt(buf[i+off] >>> 4 & 0x0F)); + str.append(HEX.charAt(buf[i+off] & 0x0F)); + if (i < len - 1) + str.append(sep); + } + return str.toString(); + } + + /** + * See {@link #toHexString(byte[],int,int,char)}. + */ + public static String toHexString(byte[] buf, char sep) + { + return Util.toHexString(buf, 0, buf.length, sep); + } + + /** + * Create a representation of the given byte array similar to the + * output of `hexdump -C', which is + * + * <p><pre>OFFSET SIXTEEN-BYTES-IN-HEX PRINTABLE-BYTES</pre> + * + * <p>The printable bytes show up as-is if they are printable and + * not a newline character, otherwise showing as '.'. + * + * @param buf The bytes to format. + * @param off The offset to start at. + * @param len The number of bytes to encode. + * @return The formatted string. + */ + public static String hexDump(byte[] buf, int off, int len, String prefix) + { + String nl = System.getProperty("line.separator"); + CPStringBuilder str = new CPStringBuilder(); + int i = 0; + while (i < len) + { + str.append(prefix); + str.append(Util.formatInt(i+off, 16, 8)); + str.append(" "); + String s = Util.toHexString(buf, i+off, Math.min(16, len-i), ' '); + str.append(s); + for (int j = 56 - (56 - s.length()); j < 56; j++) + str.append(" "); + for (int j = 0; j < Math.min(16, len - i); j++) + { + if ((buf[i+off+j] & 0xFF) < 0x20 || (buf[i+off+j] & 0xFF) > 0x7E) + str.append('.'); + else + str.append((char) (buf[i+off+j] & 0xFF)); + } + str.append(nl); + i += 16; + } + return str.toString(); + } + + /** + * See {@link #hexDump(byte[],int,int,String)}. + */ + public static String hexDump(byte[] buf, String prefix) + { + return hexDump(buf, 0, buf.length, prefix); + } + + /** + * Format an integer into the specified radix, zero-filled. + * + * @param i The integer to format. + * @param radix The radix to encode to. + * @param len The target length of the string. The string is + * zero-padded to this length, but may be longer. + * @return The formatted integer. + */ + public static String formatInt(int i, int radix, int len) + { + String s = Integer.toString(i, radix); + CPStringBuilder buf = new CPStringBuilder(); + for (int j = 0; j < len - s.length(); j++) + buf.append("0"); + buf.append(s); + return buf.toString(); + } + + /** + * Convert a hexadecimal string into its byte representation. + * + * @param hex The hexadecimal string. + * @return The converted bytes. + */ + public static byte[] toByteArray(String hex) + { + hex = hex.toLowerCase(); + byte[] buf = new byte[hex.length() / 2]; + int j = 0; + for (int i = 0; i < buf.length; i++) + { + buf[i] = (byte) ((Character.digit(hex.charAt(j++), 16) << 4) | + Character.digit(hex.charAt(j++), 16)); + } + return buf; + } +} |