/**
* Lis et retourne une piece depuis le fichier temporaire sur le disque (la piece doit exister)
*
* @param num : numéros de la piece
*/
private synchronized byte[] readPieceTmpFile(int num) {
if (num < 0 || num >= this.nbPieces()) {
throw new IllegalArgumentException();
}
try {
FileInputStream reader_tmp = new FileInputStream(this);
FileChannel reader = reader_tmp.getChannel();
int index_piece = Tools.readInt(reader, 4 + _key.length() + 4 + 4 + 4 * num);
if (index_piece < 0) {
throw new IllegalArgumentException();
}
int size = _piecesize;
if (num == this.nbPieces() - 1) {
size = _size - _piecesize * (this.nbPieces() - 1);
}
byte[] piece = Tools.readBytes(reader, this.headerSize() + _piecesize * index_piece, size);
reader_tmp.close();
return piece;
} catch (Exception e) {
System.out.println("Unable to read tmp file piece");
e.printStackTrace();
}
return new byte[0];
}
/** Lis le header du fichier temporaire et charge ses informations */
private void readHeaderTmpFile() {
try {
FileInputStream reader_tmp = new FileInputStream(this);
FileChannel reader = reader_tmp.getChannel();
int key_size = 0;
int offset = 0;
// Taile de le clef
key_size = Tools.readInt(reader, offset);
offset += 4;
// Clef
_key = Tools.readString(reader, offset, key_size);
offset += key_size;
// Size
_size = Tools.readInt(reader, offset);
offset += 4;
// piecesize
_piecesize = Tools.readInt(reader, offset);
offset += 4;
// Buffermap
_buffermap = new Buffermap(this.nbPieces(), false);
int i;
for (i = 0; i < this.nbPieces(); i++) {
int index = Tools.readInt(reader, offset);
if (index >= 0) {
_buffermap.setBit(i, true);
} else {
_buffermap.setBit(i, false);
}
offset += 4;
}
reader_tmp.close();
} catch (Exception e) {
System.out.println("Unable to read tmp file header");
e.printStackTrace();
}
}