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Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipLong.java')
| -rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipLong.java | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipLong.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipLong.java new file mode 100644 index 00000000..72af84db --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/zip/ZipLong.java @@ -0,0 +1,201 @@ +/* + * 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 static org.apache.tools.zip.ZipConstants.WORD; + +/** + * Utility class that represents a four byte integer with conversion + * rules for the big endian byte order of ZIP files. + * + */ +public final class ZipLong implements Cloneable { + + //private static final int BYTE_BIT_SIZE = 8; + + 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 final long value; + + /** Central File Header Signature */ + public static final ZipLong CFH_SIG = new ZipLong(0X02014B50L); + + /** Local File Header Signature */ + public static final ZipLong LFH_SIG = new ZipLong(0X04034B50L); + + /** + * Data Descriptor signature + */ + public static final ZipLong DD_SIG = new ZipLong(0X08074B50L); + + /** + * Value stored in size and similar fields if ZIP64 extensions are + * used. + */ + static final ZipLong ZIP64_MAGIC = new ZipLong(ZipConstants.ZIP64_MAGIC); + + /** + * Create instance from a number. + * @param value the long to store as a ZipLong + * @since 1.1 + */ + public ZipLong(long value) { + this.value = value; + } + + /** + * Create instance from bytes. + * @param bytes the bytes to store as a ZipLong + * @since 1.1 + */ + public ZipLong (byte[] bytes) { + this(bytes, 0); + } + + /** + * Create instance from the four bytes starting at offset. + * @param bytes the bytes to store as a ZipLong + * @param offset the offset to start + * @since 1.1 + */ + public ZipLong (byte[] bytes, int offset) { + value = ZipLong.getValue(bytes, offset); + } + + /** + * Get value as four bytes in big endian byte order. + * @since 1.1 + * @return value as four bytes in big endian order + */ + public byte[] getBytes() { + return ZipLong.getBytes(value); + } + + /** + * Get value as Java long. + * @since 1.1 + * @return value as a long + */ + public long getValue() { + return value; + } + + /** + * Get value as four bytes in big endian byte order. + * @param value the value to convert + * @return value as four bytes in big endian byte order + */ + public static byte[] getBytes(long value) { + byte[] result = new byte[WORD]; + putLong(value, result, 0); + return result; + } + + /** + * put the value as four bytes in big endian byte order. + * @param value the Java long to convert to bytes + * @param buf the output buffer + * @param offset + * The offset within the output buffer of the first byte to be written. + * must be non-negative and no larger than <tt>buf.length-4</tt> + */ + public static void putLong(long value, byte[] buf, int offset) { + buf[offset++] = (byte) ((value & BYTE_MASK)); + buf[offset++] = (byte) ((value & BYTE_1_MASK) >> BYTE_1_SHIFT); + buf[offset++] = (byte) ((value & BYTE_2_MASK) >> BYTE_2_SHIFT); + buf[offset] = (byte) ((value & BYTE_3_MASK) >> BYTE_3_SHIFT); + } + + public void putLong(byte[] buf, int offset) { + putLong(value, buf, offset); + } + + /** + * Helper method to get the value as a Java long from four 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 getValue(byte[] bytes, int offset) { + long value = (bytes[offset + BYTE_3] << BYTE_3_SHIFT) & BYTE_3_MASK; + value += (bytes[offset + BYTE_2] << BYTE_2_SHIFT) & BYTE_2_MASK; + value += (bytes[offset + BYTE_1] << BYTE_1_SHIFT) & BYTE_1_MASK; + value += (bytes[offset] & BYTE_MASK); + return value; + } + + /** + * Helper method to get the value as a Java long from a four-byte array + * @param bytes the array of bytes + * @return the corresponding Java long value + */ + public static long 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 + * @since 1.1 + */ + @Override + public boolean equals(Object o) { + if (o == null || !(o instanceof ZipLong)) { + return false; + } + return value == ((ZipLong) o).getValue(); + } + + /** + * Override to make two instances with same value equal. + * @return the value stored in the ZipLong + * @since 1.1 + */ + @Override + public int hashCode() { + return (int) value; + } + + @Override + public Object clone() { + try { + return super.clone(); + } catch (CloneNotSupportedException cnfe) { + // impossible + throw new RuntimeException(cnfe); + } + } + + @Override + public String toString() { + return "ZipLong value: " + value; + } +} |