File	Doc	Category	Size	Date	Package
TarUtils.java	API Doc	Apache Ant 1.70	6175	Wed Dec 13 06:16:18 GMT 2006	org.apache.tools.tar

TarUtils

• java.lang.Object

Fields Summary

Constructors Summary

Methods Summary
public static long	computeCheckSum(byte[] buf) Compute the checksum of a tar entry header. param buf The tar entry's header buffer. return The computed checksum. long sum = 0; for (int i = 0; i < buf.length; ++i) { sum += 255 & buf[i]; } return sum;
public static int	getCheckSumOctalBytes(long value, byte[] buf, int offset, int length) Parse the checksum octal integer from a header buffer. param value The header value param buf The buffer from which to parse. param offset 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. getOctalBytes(value, buf, offset, length); buf[offset + length - 1] = (byte) ' "; buf[offset + length - 2] = 0; return offset + length;
public static int	getLongOctalBytes(long value, byte[] buf, int offset, int length) Parse an octal long integer from a header buffer. param value The header value param buf The buffer from which to parse. param offset The offset into the buffer from which to parse. param length The number of header bytes to parse. return The long value of the octal bytes. byte[] temp = new byte[length + 1]; getOctalBytes(value, temp, 0, length + 1); System.arraycopy(temp, 0, buf, offset, length); return offset + length;
public static int	getNameBytes(java.lang.StringBuffer name, byte[] buf, int offset, int length) Determine the number of bytes in an entry name. param name The header name from which to parse. param buf The buffer from which to parse. param offset The offset into the buffer from which to parse. param length The number of header bytes to parse. return The number of bytes in a header's entry name. int i; for (i = 0; i < length && i < name.length(); ++i) { buf[offset + i] = (byte) name.charAt(i); } for (; i < length; ++i) { buf[offset + i] = 0; } return offset + length;
public static int	getOctalBytes(long value, byte[] buf, int offset, int length) Parse an octal integer from a header buffer. param value The header value param buf The buffer from which to parse. param offset The offset into the buffer from which to parse. param length The number of header bytes to parse. return The integer value of the octal bytes. int idx = length - 1; buf[offset + idx] = 0; --idx; buf[offset + idx] = (byte) ' "; --idx; if (value == 0) { buf[offset + idx] = (byte) '0"; --idx; } else { for (long val = value; idx >= 0 && val > 0; --idx) { buf[offset + idx] = (byte) ((byte) '0" + (byte) (val & 7)); val = val >> 3; } } for (; idx >= 0; --idx) { buf[offset + idx] = (byte) ' "; } return offset + length;
public static java.lang.StringBuffer	parseName(byte[] header, int offset, int length) Parse an entry name from a header buffer. param header The header buffer from which to parse. param offset The offset into the buffer from which to parse. param length The number of header bytes to parse. return The header's entry name. StringBuffer result = new StringBuffer(length); int end = offset + length; for (int i = offset; i < end; ++i) { if (header[i] == 0) { break; } result.append((char) header[i]); } return result;
public static long	parseOctal(byte[] header, int offset, int length) Parse an octal string from a header buffer. This is used for the file permission mode value. param header The header buffer from which to parse. param offset The offset into the buffer from which to parse. param length The number of header bytes to parse. return The long value of the octal string. long result = 0; boolean stillPadding = true; int end = offset + length; for (int i = offset; i < end; ++i) { if (header[i] == 0) { break; } if (header[i] == (byte) ' " || header[i] == '0") { if (stillPadding) { continue; } if (header[i] == (byte) ' ") { break; } } stillPadding = false; result = (result << 3) + (header[i] - '0"); } return result;