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-rw-r--r--src/com/pkrandom/newnds/NARCArchive.java221
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diff --git a/src/com/pkrandom/newnds/NARCArchive.java b/src/com/pkrandom/newnds/NARCArchive.java
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+++ b/src/com/pkrandom/newnds/NARCArchive.java
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+package com.pkrandom.newnds;
+
+/*----------------------------------------------------------------------------*/
+/*-- NARCArchive.java - class for packing/unpacking GARC archives --*/
+/*-- --*/
+/*-- Part of "Universal Pokemon Randomizer ZX" by the UPR-ZX team --*/
+/*-- Pokemon and any associated names and the like are --*/
+/*-- trademark and (C) Nintendo 1996-2020. --*/
+/*-- --*/
+/*-- The custom code written here is licensed 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 java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+
+public class NARCArchive {
+
+ private List<String> filenames = new ArrayList<>();
+ public List<byte[]> files = new ArrayList<>();
+
+ private boolean hasFilenames = false;
+
+ public NARCArchive() {
+ // creates a new empty NARC with no filenames by default
+ }
+
+ public NARCArchive(byte[] data) throws IOException {
+ Map<String, byte[]> frames = readNitroFrames(data);
+ if (!frames.containsKey("FATB") || !frames.containsKey("FNTB") || !frames.containsKey("FIMG")) {
+ throw new IOException("Not a valid narc file");
+ }
+
+ // File contents
+ byte[] fatbframe = frames.get("FATB");
+ byte[] fimgframe = frames.get("FIMG");
+ int fileCount = readLong(fatbframe, 0);
+ for (int i = 0; i < fileCount; i++) {
+ int startOffset = readLong(fatbframe, 4 + i * 8);
+ int endOffset = readLong(fatbframe, 8 + i * 8);
+ int length = (endOffset - startOffset);
+ byte[] thisFile = new byte[length];
+ System.arraycopy(fimgframe, startOffset, thisFile, 0, length);
+ files.add(thisFile);
+ }
+
+ // Filenames?
+ byte[] fntbframe = frames.get("FNTB");
+ int unk1 = readLong(fntbframe, 0);
+ if (unk1 == 8) {
+ // Filenames exist
+ hasFilenames = true;
+ int offset = 8;
+ for (int i = 0; i < fileCount; i++) {
+ int fnLength = (fntbframe[offset] & 0xFF);
+ offset++;
+ byte[] filenameBA = new byte[fnLength];
+ System.arraycopy(fntbframe, offset, filenameBA, 0, fnLength);
+ String filename = new String(filenameBA, "US-ASCII");
+ filenames.add(filename);
+ }
+ } else {
+ hasFilenames = false;
+ for (int i = 0; i < fileCount; i++) {
+ filenames.add(null);
+ }
+ }
+ }
+
+ public byte[] getBytes() throws IOException {
+ // Get bytes required for FIMG frame
+ int bytesRequired = 0;
+ for (byte[] file : files) {
+ bytesRequired += Math.ceil(file.length / 4.0) * 4;
+ }
+ // FIMG frame & FATB frame build
+
+ // 4 for numentries, 8*size for entries, 8 for nitro header
+ byte[] fatbFrame = new byte[4 + files.size() * 8 + 8];
+ // bytesRequired + 8 for nitro header
+ byte[] fimgFrame = new byte[bytesRequired + 8];
+
+ // Nitro headers
+ fatbFrame[0] = 'B';
+ fatbFrame[1] = 'T';
+ fatbFrame[2] = 'A';
+ fatbFrame[3] = 'F';
+ writeLong(fatbFrame, 4, fatbFrame.length);
+
+ fimgFrame[0] = 'G';
+ fimgFrame[1] = 'M';
+ fimgFrame[2] = 'I';
+ fimgFrame[3] = 'F';
+ writeLong(fimgFrame, 4, fimgFrame.length);
+ int offset = 0;
+
+ writeLong(fatbFrame, 8, files.size());
+ for (int i = 0; i < files.size(); i++) {
+ byte[] file = files.get(i);
+ int bytesRequiredForFile = (int) (Math.ceil(file.length / 4.0) * 4);
+ System.arraycopy(file, 0, fimgFrame, offset + 8, file.length);
+ for (int filler = file.length; filler < bytesRequiredForFile; filler++) {
+ fimgFrame[offset + 8 + filler] = (byte) 0xFF;
+ }
+ writeLong(fatbFrame, 12 + i * 8, offset);
+ writeLong(fatbFrame, 16 + i * 8, offset + file.length);
+ offset += bytesRequiredForFile;
+ }
+
+ // FNTB Frame
+ int bytesForFNTBFrame = 16;
+ if (hasFilenames) {
+ for (String filename : filenames) {
+ bytesForFNTBFrame += filename.getBytes("US-ASCII").length + 1;
+ }
+ }
+ byte[] fntbFrame = new byte[bytesForFNTBFrame];
+
+ fntbFrame[0] = 'B';
+ fntbFrame[1] = 'T';
+ fntbFrame[2] = 'N';
+ fntbFrame[3] = 'F';
+ writeLong(fntbFrame, 4, fntbFrame.length);
+
+ if (hasFilenames) {
+ writeLong(fntbFrame, 8, 8);
+ writeLong(fntbFrame, 12, 0x10000);
+ int fntbOffset = 16;
+ for (String filename : filenames) {
+ byte[] fntbfilename = filename.getBytes("US-ASCII");
+ fntbFrame[fntbOffset] = (byte) fntbfilename.length;
+ System.arraycopy(fntbfilename, 0, fntbFrame, fntbOffset + 1, fntbfilename.length);
+ fntbOffset += 1 + fntbfilename.length;
+ }
+ } else {
+ writeLong(fntbFrame, 8, 4);
+ writeLong(fntbFrame, 12, 0x10000);
+ }
+
+ // Now for the actual Nitro file
+ int nitrolength = 16 + fatbFrame.length + fntbFrame.length + fimgFrame.length;
+ byte[] nitroFile = new byte[nitrolength];
+ nitroFile[0] = 'N';
+ nitroFile[1] = 'A';
+ nitroFile[2] = 'R';
+ nitroFile[3] = 'C';
+ writeWord(nitroFile, 4, 0xFFFE);
+ writeWord(nitroFile, 6, 0x0100);
+ writeLong(nitroFile, 8, nitrolength);
+ writeWord(nitroFile, 12, 0x10);
+ writeWord(nitroFile, 14, 3);
+ System.arraycopy(fatbFrame, 0, nitroFile, 16, fatbFrame.length);
+ System.arraycopy(fntbFrame, 0, nitroFile, 16 + fatbFrame.length, fntbFrame.length);
+ System.arraycopy(fimgFrame, 0, nitroFile, 16 + fatbFrame.length + fntbFrame.length, fimgFrame.length);
+
+ return nitroFile;
+ }
+
+ private Map<String, byte[]> readNitroFrames(byte[] data) throws IOException {
+
+ // Read the number of frames
+ int frameCount = readWord(data, 0x0E);
+
+ // each frame
+ int offset = 0x10;
+ Map<String, byte[]> frames = new TreeMap<>();
+ for (int i = 0; i < frameCount; i++) {
+ byte[] magic = new byte[] { data[offset + 3], data[offset + 2], data[offset + 1], data[offset] };
+ String magicS = new String(magic, "US-ASCII");
+
+ int frame_size = readLong(data, offset + 4);
+ // Patch for BB/VW and other DS hacks which don't update
+ // the size of their expanded NARCs correctly
+ if (i == frameCount - 1 && offset + frame_size < data.length) {
+ frame_size = data.length - offset;
+ }
+ byte[] frame = new byte[frame_size - 8];
+ System.arraycopy(data, offset + 8, frame, 0, frame_size - 8);
+ frames.put(magicS, frame);
+ offset += frame_size;
+ }
+ return frames;
+ }
+
+ private int readWord(byte[] data, int offset) {
+ return (data[offset] & 0xFF) | ((data[offset + 1] & 0xFF) << 8);
+ }
+
+ private int readLong(byte[] data, int offset) {
+ return (data[offset] & 0xFF) | ((data[offset + 1] & 0xFF) << 8) | ((data[offset + 2] & 0xFF) << 16)
+ | ((data[offset + 3] & 0xFF) << 24);
+ }
+
+ private void writeWord(byte[] data, int offset, int value) {
+ data[offset] = (byte) (value & 0xFF);
+ data[offset + 1] = (byte) ((value >> 8) & 0xFF);
+ }
+
+ private void writeLong(byte[] data, int offset, int value) {
+ data[offset] = (byte) (value & 0xFF);
+ data[offset + 1] = (byte) ((value >> 8) & 0xFF);
+ data[offset + 2] = (byte) ((value >> 16) & 0xFF);
+ data[offset + 3] = (byte) ((value >> 24) & 0xFF);
+ }
+
+}
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