/**
* Write an entry's header information to a header buffer. This method can throw an
* InvalidHeaderException
*
* @param outbuf The tar entry header buffer to fill in.
* @throws InvalidHeaderException If the name will not fit in the header.
*/
public void writeEntryHeader(byte[] outbuf) throws InvalidHeaderException {
int offset = 0;
if (this.isUnixTarFormat()) {
if (this.header.name.length() > 100) {
throw new InvalidHeaderException(
"file path is greater than 100 characters, " + this.header.name);
}
}
offset = TarHeader.getFileNameBytes(this.header.name.toString(), outbuf);
offset = TarHeader.getOctalBytes(this.header.mode, outbuf, offset, TarHeader.MODELEN);
offset = TarHeader.getOctalBytes(this.header.userId, outbuf, offset, TarHeader.UIDLEN);
offset = TarHeader.getOctalBytes(this.header.groupId, outbuf, offset, TarHeader.GIDLEN);
long size = this.header.size;
offset = TarHeader.getLongOctalBytes(size, outbuf, offset, TarHeader.SIZELEN);
offset = TarHeader.getLongOctalBytes(this.header.modTime, outbuf, offset, TarHeader.MODTIMELEN);
int csOffset = offset;
for (int c = 0; c < TarHeader.CHKSUMLEN; ++c) {
outbuf[offset++] = (byte) ' ';
}
outbuf[offset++] = this.header.linkFlag;
offset = TarHeader.getNameBytes(this.header.linkName, outbuf, offset, TarHeader.NAMELEN);
if (this.unixFormat) {
for (int i = 0; i < TarHeader.MAGICLEN; ++i) {
outbuf[offset++] = 0;
}
} else {
offset = TarHeader.getNameBytes(this.header.magic, outbuf, offset, TarHeader.MAGICLEN);
}
offset = TarHeader.getNameBytes(this.header.userName, outbuf, offset, TarHeader.UNAMELEN);
offset = TarHeader.getNameBytes(this.header.groupName, outbuf, offset, TarHeader.GNAMELEN);
offset = TarHeader.getOctalBytes(this.header.devMajor, outbuf, offset, TarHeader.DEVLEN);
offset = TarHeader.getOctalBytes(this.header.devMinor, outbuf, offset, TarHeader.DEVLEN);
for (; offset < outbuf.length; ) {
outbuf[offset++] = 0;
}
long checkSum = this.computeCheckSum(outbuf);
TarHeader.getCheckSumOctalBytes(checkSum, outbuf, csOffset, TarHeader.CHKSUMLEN);
}
/**
* Parse the checksum octal integer 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 integer value of the entry's checksum.
*/
public static int getCheckSumOctalBytes(long value, byte[] buf, int offset, int length) {
TarHeader.getOctalBytes(value, buf, offset, length);
buf[offset + length - 1] = (byte) ' ';
buf[offset + length - 2] = 0;
return offset + length;
}
/**
* Parse an octal long integer 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 long value of the octal bytes.
*/
public static int getLongOctalBytes(long value, byte[] buf, int offset, int length) {
byte[] temp = new byte[length + 1];
TarHeader.getOctalBytes(value, temp, 0, length + 1);
System.arraycopy(temp, 0, buf, offset, length);
return offset + length;
}
