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Support entries larger than 8GiB

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topjohnwu 2024-03-14 16:37:14 -07:00
parent 79d0698a9f
commit b18499211d
2 changed files with 33 additions and 11 deletions
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40
src/main/java/org/kamranzafar/jtar/Octal.java
View File

@ -17,15 +17,21 @@
package org.kamranzafar.jtar;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* @author Kamran Zafar
* @author Kamran Zafar, John Wu
*
*/
public class Octal {
// 8 ^ 11 - 1
private static final long OCTAL_MAX = 8589934591L;
private static final byte LARGE_NUM_MASK = (byte) 0x80;
/**
* Parse an octal string from a header buffer. This is used for the file
* permission mode value.
* Parse an octal string from a header buffer.
*
* @param header
* The header buffer from which to parse.
@ -42,20 +48,27 @@ public class Octal {
int end = offset + length;
for (int i = offset; i < end; ++i) {
if (header[i] == 0)
byte b = header[i];
if ((b & LARGE_NUM_MASK) != 0 && length == 12) {
// Read the lower 8 bytes as big-endian long value
return ByteBuffer.wrap(header, offset + 4, 8).order(ByteOrder.BIG_ENDIAN).getLong();
}
if (b == 0)
break;
if (header[i] == (byte) ' ' || header[i] == '0') {
if (b == (byte) ' ' || b == '0') {
if (stillPadding)
continue;
if (header[i] == (byte) ' ')
if (b == (byte) ' ')
break;
}
stillPadding = false;
result = ( result << 3 ) + ( header[i] - '0' );
result = ( result << 3 ) + ( b - '0' );
}
return result;
@ -73,9 +86,18 @@ public class Octal {
* @param length
* The number of header bytes to parse.
*
* @return The integer value of the octal bytes.
* @return The new offset.
*/
public static int getOctalBytes(long value, byte[] buf, int offset, int length) {
if (value > OCTAL_MAX && length == 12) {
buf[offset] = LARGE_NUM_MASK;
buf[offset + 1] = 0;
buf[offset + 2] = 0;
buf[offset + 3] = 0;
ByteBuffer.wrap(buf, offset + 4, 8).order(ByteOrder.BIG_ENDIAN).putLong(value);
return offset + length;
}
int idx = length - 1;
buf[offset + idx] = 0;
@ -100,7 +122,7 @@ public class Octal {
* The offset into the buffer from which to parse.
* @param length
* The number of header bytes to parse.
* @return The integer value of the entry's checksum.
* @return The new offset.
*/
public static int getCheckSumOctalBytes(long value, byte[] buf, int offset, int length) {
getOctalBytes(value, buf, offset, length - 1);

4
src/main/java/org/kamranzafar/jtar/TarHeader.java
View File

@ -93,7 +93,7 @@ public class TarHeader {
public static final byte LF_CONTIG = (byte) '7';
/*
* Ustar header
* GNU header
*/
public static final String USTAR_MAGIC = "ustar ";
@ -228,4 +228,4 @@ public class TarHeader {
return header;
}
}
}