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Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEightByteInteger.java')
| -rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEightByteInteger.java | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEightByteInteger.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEightByteInteger.java new file mode 100644 index 00000000..8d582dd8 --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipEightByteInteger.java @@ -0,0 +1,229 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ +package org.apache.tools.zip; + +import static org.apache.tools.zip.ZipConstants.BYTE_MASK; + +import java.math.BigInteger; + +/** + * Utility class that represents an eight byte integer with conversion + * rules for the big endian byte order of ZIP files. + */ +public final class ZipEightByteInteger { + + private static final int BYTE_1 = 1; + private static final int BYTE_1_MASK = 0xFF00; + private static final int BYTE_1_SHIFT = 8; + + private static final int BYTE_2 = 2; + private static final int BYTE_2_MASK = 0xFF0000; + private static final int BYTE_2_SHIFT = 16; + + private static final int BYTE_3 = 3; + private static final long BYTE_3_MASK = 0xFF000000L; + private static final int BYTE_3_SHIFT = 24; + + private static final int BYTE_4 = 4; + private static final long BYTE_4_MASK = 0xFF00000000L; + private static final int BYTE_4_SHIFT = 32; + + private static final int BYTE_5 = 5; + private static final long BYTE_5_MASK = 0xFF0000000000L; + private static final int BYTE_5_SHIFT = 40; + + private static final int BYTE_6 = 6; + private static final long BYTE_6_MASK = 0xFF000000000000L; + private static final int BYTE_6_SHIFT = 48; + + private static final int BYTE_7 = 7; + private static final long BYTE_7_MASK = 0x7F00000000000000L; + private static final int BYTE_7_SHIFT = 56; + + private static final int LEFTMOST_BIT_SHIFT = 63; + private static final byte LEFTMOST_BIT = (byte) 0x80; + + private final BigInteger value; + + public static final ZipEightByteInteger ZERO = new ZipEightByteInteger(0); + + /** + * Create instance from a number. + * @param value the long to store as a ZipEightByteInteger + */ + public ZipEightByteInteger(long value) { + this(BigInteger.valueOf(value)); + } + + /** + * Create instance from a number. + * @param value the BigInteger to store as a ZipEightByteInteger + */ + public ZipEightByteInteger(BigInteger value) { + this.value = value; + } + + /** + * Create instance from bytes. + * @param bytes the bytes to store as a ZipEightByteInteger + */ + public ZipEightByteInteger (byte[] bytes) { + this(bytes, 0); + } + + /** + * Create instance from the eight bytes starting at offset. + * @param bytes the bytes to store as a ZipEightByteInteger + * @param offset the offset to start + */ + public ZipEightByteInteger (byte[] bytes, int offset) { + value = ZipEightByteInteger.getValue(bytes, offset); + } + + /** + * Get value as eight bytes in big endian byte order. + * @return value as eight bytes in big endian order + */ + public byte[] getBytes() { + return ZipEightByteInteger.getBytes(value); + } + + /** + * Get value as Java long. + * @return value as a long + */ + public long getLongValue() { + return value.longValue(); + } + + /** + * Get value as Java long. + * @return value as a long + */ + public BigInteger getValue() { + return value; + } + + /** + * Get value as eight bytes in big endian byte order. + * @param value the value to convert + * @return value as eight bytes in big endian byte order + */ + public static byte[] getBytes(long value) { + return getBytes(BigInteger.valueOf(value)); + } + + /** + * Get value as eight bytes in big endian byte order. + * @param value the value to convert + * @return value as eight bytes in big endian byte order + */ + public static byte[] getBytes(BigInteger value) { + byte[] result = new byte[8]; + long val = value.longValue(); + result[0] = (byte) ((val & BYTE_MASK)); + result[BYTE_1] = (byte) ((val & BYTE_1_MASK) >> BYTE_1_SHIFT); + result[BYTE_2] = (byte) ((val & BYTE_2_MASK) >> BYTE_2_SHIFT); + result[BYTE_3] = (byte) ((val & BYTE_3_MASK) >> BYTE_3_SHIFT); + result[BYTE_4] = (byte) ((val & BYTE_4_MASK) >> BYTE_4_SHIFT); + result[BYTE_5] = (byte) ((val & BYTE_5_MASK) >> BYTE_5_SHIFT); + result[BYTE_6] = (byte) ((val & BYTE_6_MASK) >> BYTE_6_SHIFT); + result[BYTE_7] = (byte) ((val & BYTE_7_MASK) >> BYTE_7_SHIFT); + if (value.testBit(LEFTMOST_BIT_SHIFT)) { + result[BYTE_7] |= LEFTMOST_BIT; + } + return result; + } + + /** + * Helper method to get the value as a Java long from eight bytes + * starting at given array offset + * @param bytes the array of bytes + * @param offset the offset to start + * @return the corresponding Java long value + */ + public static long getLongValue(byte[] bytes, int offset) { + return getValue(bytes, offset).longValue(); + } + + /** + * Helper method to get the value as a Java BigInteger from eight + * bytes starting at given array offset + * @param bytes the array of bytes + * @param offset the offset to start + * @return the corresponding Java BigInteger value + */ + public static BigInteger getValue(byte[] bytes, int offset) { + long value = ((long) bytes[offset + BYTE_7] << BYTE_7_SHIFT) & BYTE_7_MASK; + value += ((long) bytes[offset + BYTE_6] << BYTE_6_SHIFT) & BYTE_6_MASK; + value += ((long) bytes[offset + BYTE_5] << BYTE_5_SHIFT) & BYTE_5_MASK; + value += ((long) bytes[offset + BYTE_4] << BYTE_4_SHIFT) & BYTE_4_MASK; + value += ((long) bytes[offset + BYTE_3] << BYTE_3_SHIFT) & BYTE_3_MASK; + value += ((long) bytes[offset + BYTE_2] << BYTE_2_SHIFT) & BYTE_2_MASK; + value += ((long) bytes[offset + BYTE_1] << BYTE_1_SHIFT) & BYTE_1_MASK; + value += ((long) bytes[offset] & BYTE_MASK); + BigInteger val = BigInteger.valueOf(value); + return (bytes[offset + BYTE_7] & LEFTMOST_BIT) == LEFTMOST_BIT + ? val.setBit(LEFTMOST_BIT_SHIFT) : val; + } + + /** + * Helper method to get the value as a Java long from an eight-byte array + * @param bytes the array of bytes + * @return the corresponding Java long value + */ + public static long getLongValue(byte[] bytes) { + return getLongValue(bytes, 0); + } + + /** + * Helper method to get the value as a Java long from an eight-byte array + * @param bytes the array of bytes + * @return the corresponding Java BigInteger value + */ + public static BigInteger getValue(byte[] bytes) { + return getValue(bytes, 0); + } + + /** + * Override to make two instances with same value equal. + * @param o an object to compare + * @return true if the objects are equal + */ + @Override + public boolean equals(Object o) { + if (o == null || !(o instanceof ZipEightByteInteger)) { + return false; + } + return value.equals(((ZipEightByteInteger) o).getValue()); + } + + /** + * Override to make two instances with same value equal. + * @return the hashCode of the value stored in the ZipEightByteInteger + */ + @Override + public int hashCode() { + return value.hashCode(); + } + + @Override + public String toString() { + return "ZipEightByteInteger value: " + value; + } +} |