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package com.pkrandom.ctr;
/*----------------------------------------------------------------------------*/
/*-- Mini.java - class for packing/unpacking Mini archives --*/
/*-- --*/
/*-- Code based on "pk3DS", copyright (C) Kaphotics --*/
/*-- --*/
/*-- Ported to Java by UPR-ZX Team under the terms of the GPL: --*/
/*-- --*/
/*-- This program is free software: you can redistribute it and/or modify --*/
/*-- it under the terms of the GNU General Public License as published by --*/
/*-- the Free Software Foundation, either version 3 of the License, or --*/
/*-- (at your option) any later version. --*/
/*-- --*/
/*-- This program is distributed in the hope that it will be useful, --*/
/*-- but WITHOUT ANY WARRANTY; without even the implied warranty of --*/
/*-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the --*/
/*-- GNU General Public License for more details. --*/
/*-- --*/
/*-- You should have received a copy of the GNU General Public License --*/
/*-- along with this program. If not, see <http://www.gnu.org/licenses/>. --*/
/*----------------------------------------------------------------------------*/
import com.pkrandom.FileFunctions;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
public class Mini {
public static byte[] PackMini(byte[][] fileData, String identifier) throws IOException {
// Create new Binary with the relevant header bytes
byte[] data = new byte[4];
data[0] = (byte) identifier.charAt(0);
data[1] = (byte) identifier.charAt(1);
ByteBuffer buf = ByteBuffer.allocate(2);
buf.order(ByteOrder.LITTLE_ENDIAN);
buf.putShort((short) fileData.length);
System.arraycopy(buf.array(), 0, data, 2, 2);
int count = fileData.length;
int dataOffset = 4 + 4 + (count * 4);
// Start the data filling
ByteArrayOutputStream dataOut = new ByteArrayOutputStream();
ByteArrayOutputStream offsetMap = new ByteArrayOutputStream();
// For each file...
for (int i = 0; i < count; i++) {
int fileOffset = dataOut.size() + dataOffset;
buf = ByteBuffer.allocate(4);
buf.order(ByteOrder.LITTLE_ENDIAN);
buf.putInt(fileOffset);
offsetMap.write(buf.array());
dataOut.write(fileData[i]);
// Pad with zeroes until len % 4 == 0
while (dataOut.size() % 4 != 0) {
dataOut.write((byte) 0);
}
}
// Cap the file
buf = ByteBuffer.allocate(4);
buf.order(ByteOrder.LITTLE_ENDIAN);
buf.putInt(dataOut.size() + dataOffset);
offsetMap.write(buf.array());
ByteArrayOutputStream newPack = new ByteArrayOutputStream();
ByteArrayOutputStream header = new ByteArrayOutputStream();
header.write(data);
header.writeTo(newPack);
offsetMap.writeTo(newPack);
dataOut.writeTo(newPack);
return newPack.toByteArray();
}
public static byte[][] UnpackMini(byte[] fileData, String identifier) {
if (fileData == null || fileData.length < 4) {
return null;
}
if (identifier.charAt(0) != fileData[0] || identifier.charAt(1) != fileData[1]) {
return null;
}
int count = FileFunctions.read2ByteInt(fileData, 2);
int ctr = 4;
int start = FileFunctions.readFullInt(fileData, ctr);
ctr += 4;
byte[][] returnData = new byte[count][];
for (int i = 0; i < count; i++) {
int end = FileFunctions.readFullInt(fileData, ctr);
ctr += 4;
int len = end - start;
byte[] data = new byte[len];
System.arraycopy(fileData, start, data, 0, len);
returnData[i] = data;
start = end;
}
return returnData;
}
}
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