forked from MarcoBuster/Magisk
65 lines
2.1 KiB
Java
65 lines
2.1 KiB
Java
package com.topjohnwu.magisk.container;
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import org.kamranzafar.jtar.TarHeader;
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import java.io.File;
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import java.util.Arrays;
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public class TarEntry extends org.kamranzafar.jtar.TarEntry {
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public TarEntry(File file, String entryName) {
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super(file, entryName);
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}
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/*
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* Workaround missing java.nio.file.attribute.PosixFilePermission
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* Simply just assign a default permission to the file
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* */
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@Override
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public void extractTarHeader(String entryName) {
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int permissions = file.isDirectory() ? 000755 : 000644;
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header = TarHeader.createHeader(entryName, file.length(), file.lastModified() / 1000, file.isDirectory(), permissions);
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header.userName = new StringBuffer("");
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header.groupName = header.userName;
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}
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/*
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* Rewrite the header to GNU format
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* */
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@Override
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public void writeEntryHeader(byte[] outbuf) {
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super.writeEntryHeader(outbuf);
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System.arraycopy("ustar \0".getBytes(), 0, outbuf, 257, TarHeader.USTAR_MAGICLEN);
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getOctalBytes(header.mode, outbuf, 100, TarHeader.MODELEN);
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getOctalBytes(header.userId, outbuf, 108, TarHeader.UIDLEN);
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getOctalBytes(header.groupId, outbuf, 116, TarHeader.GIDLEN);
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getOctalBytes(header.size, outbuf, 124, TarHeader.SIZELEN);
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getOctalBytes(header.modTime, outbuf, 136, TarHeader.MODTIMELEN);
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Arrays.fill(outbuf, 148, 148 + TarHeader.CHKSUMLEN, (byte) ' ');
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Arrays.fill(outbuf, 329, 329 + TarHeader.USTAR_DEVLEN, (byte) '\0');
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Arrays.fill(outbuf, 337, 337 + TarHeader.USTAR_DEVLEN, (byte) '\0');
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// Recalculate checksum
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getOctalBytes(computeCheckSum(outbuf), outbuf, 148, TarHeader.CHKSUMLEN);
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}
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/*
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* Proper octal to ASCII conversion
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* */
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private void getOctalBytes(long value, byte[] buf, int offset, int length) {
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int idx = length - 1;
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buf[offset + idx] = 0;
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--idx;
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for (long val = value; idx >= 0; --idx) {
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buf[offset + idx] = (byte) ((byte) '0' + (byte) (val & 7));
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val = val >> 3;
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}
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}
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}
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