private void init() //throws IOException
{
if (null == inJ)
{
throw new java.io.IOException("No InputStream");
}
if (inJ.available() == 0)
{
throw new java.io.IOException("Empty InputStream");
}
checkMagicChar('B', "first");
checkMagicChar('Z', "second");
checkMagicChar('h', "third");
int blockSize = this.inJ.read();
if ((blockSize < '1') || (blockSize > '9'))
{
throw new java.io.IOException("Stream is not BZip2 formatted: illegal " + "blocksize " + (char)blockSize);
}
this.blockSize100k = blockSize - '0';
initBlock();
setupBlock();
}
/**
* Returns the next AR entry in this stream.
*
* @return the next AR entry.
* @throws IOException
* if the entry could not be read
*/
public ArArchiveEntry getNextArEntry() // throws IOException
{
if (currentEntry != null)
{
long entryEnd = entryOffset + currentEntry.getLength();
while (offset < entryEnd)
{
int x = read();
if (x == -1)
{
// hit EOF before previous entry was complete
// TODO: throw an exception instead?
return(null);
}
}
currentEntry = null;
}
if (offset == 0)
{
byte[] expected = ArchiveUtils.toAsciiBytes(ArArchiveEntry.HEADER);
byte[] realized = new byte[expected.Length];
int readJ = read(realized);
if (readJ != expected.Length)
{
throw new java.io.IOException("failed to read header. Occured at byte: " + getBytesRead());
}
for (int i = 0; i < expected.Length; i++)
{
if (expected[i] != realized[i])
{
throw new java.io.IOException("invalid header " + ArchiveUtils.toAsciiString(realized));
}
}
}
if (offset % 2 != 0)
{
if (read() < 0)
{
// hit eof
return(null);
}
}
if (input.available() == 0)
{
return(null);
}
byte[] name = new byte[16];
byte[] lastmodified = new byte[12];
byte[] userid = new byte[6];
byte[] groupid = new byte[6];
byte[] filemode = new byte[8];
byte[] length = new byte[10];
read(name);
read(lastmodified);
read(userid);
read(groupid);
read(filemode);
read(length);
{
byte[] expected = ArchiveUtils.toAsciiBytes(ArArchiveEntry.TRAILER);
byte[] realized = new byte[expected.Length];
int readJ = read(realized);
if (readJ != expected.Length)
{
throw new java.io.IOException("failed to read entry trailer. Occured at byte: " + getBytesRead());
}
for (int i = 0; i < expected.Length; i++)
{
if (expected[i] != realized[i])
{
throw new java.io.IOException("invalid entry trailer. not read the content? Occured at byte: " + getBytesRead());
}
}
}
entryOffset = offset;
// GNU ar stores multiple extended filenames in the data section of a file with the name "//", this record is referred to by future headers. A header references an extended filename by storing a "/" followed by a decimal offset to the start of the filename in the extended filename data section. The format of this "//" file itself is simply a list of the long filenames, each separated by one or more LF characters. Note that the decimal offsets are number of characters, not line or string number within the "//" file.
//
// GNU ar uses a '/' to mark the end of the filename; this allows for the use of spaces without the use of an extended filename.
// entry name is stored as ASCII string
String temp = ArchiveUtils.toAsciiString(name).trim();
if (temp.equals("//")) // GNU extended filenames entry
{
int bufflen = asInt(length); // Assume length will fit in an int
namebuffer = new byte[bufflen];
int readJ = read(namebuffer, 0, bufflen);
if (readJ != bufflen)
{
throw new java.io.IOException("Failed to read complete // record: expected=" + bufflen + " read=" + readJ);
}
currentEntry = new ArArchiveEntry(temp, bufflen);
return(getNextArEntry());
}
else if (temp.EndsWith("/")) // GNU terminator
{
temp = temp.substring(0, temp.length() - 1);
}
else if (temp.matches("^/\\d+")) // GNU long filename ref.
{
int offsetJ = java.lang.Integer.parseInt(temp.substring(1)); // get the offset
temp = getExtendedName(offsetJ); // convert to the long name
}
currentEntry = new ArArchiveEntry(temp, asLong(length), asInt(userid),
asInt(groupid), asInt(filemode, 8),
asLong(lastmodified));
return(currentEntry);
}
