game/2006Scape Client/src/main/java/Decompressor.java

// Decompiled by Jad v1.5.8f. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.kpdus.com/jad.html
// Decompiler options: packimports(3) 

import java.io.IOException;
import java.io.RandomAccessFile;

final class Decompressor {

	public Decompressor(RandomAccessFile randomaccessfile, RandomAccessFile randomaccessfile1, int j) {
		anInt311 = j;
		dataFile = randomaccessfile;
		indexFile = randomaccessfile1;
	}

	public synchronized byte[] decompress(int i) {
		try {
			seekTo(indexFile, i * 6);
			int l;
			for (int j = 0; j < 6; j += l) {
				l = indexFile.read(buffer, j, 6 - j);
				if (l == -1) {
					return null;
				}
			}

			int i1 = ((buffer[0] & 0xff) << 16) + ((buffer[1] & 0xff) << 8) + (buffer[2] & 0xff);
			int j1 = ((buffer[3] & 0xff) << 16) + ((buffer[4] & 0xff) << 8) + (buffer[5] & 0xff);
			// if(i1 < 0 || i1 > 0x7a120)
			// return null;
			if (j1 <= 0 || j1 > dataFile.length() / 520L) {
				return null;
			}
			byte abyte0[] = new byte[i1];
			int k1 = 0;
			for (int l1 = 0; k1 < i1; l1++) {
				if (j1 == 0) {
					return null;
				}
				seekTo(dataFile, j1 * 520);
				int k = 0;
				int i2 = i1 - k1;
				if (i2 > 512) {
					i2 = 512;
				}
				int j2;
				for (; k < i2 + 8; k += j2) {
					j2 = dataFile.read(buffer, k, i2 + 8 - k);
					if (j2 == -1) {
						return null;
					}
				}

				int k2 = ((buffer[0] & 0xff) << 8) + (buffer[1] & 0xff);
				int l2 = ((buffer[2] & 0xff) << 8) + (buffer[3] & 0xff);
				int i3 = ((buffer[4] & 0xff) << 16) + ((buffer[5] & 0xff) << 8) + (buffer[6] & 0xff);
				int j3 = buffer[7] & 0xff;
				if (k2 != i || l2 != l1 || j3 != anInt311) {
					return null;
				}
				if (i3 < 0 || i3 > dataFile.length() / 520L) {
					return null;
				}
				for (int k3 = 0; k3 < i2; k3++) {
					abyte0[k1++] = buffer[k3 + 8];
				}

				j1 = i3;
			}

			return abyte0;
		} catch (IOException _ex) {
			return null;
		}
	}

	public synchronized boolean method234(int i, byte abyte0[], int j)
	{
		boolean flag = method235(true, j, i, abyte0);
		if(!flag)
			flag = method235(false, j, i, abyte0);
		return flag;
	}

	private synchronized boolean method235(boolean flag, int j, int k, byte abyte0[]) {
		try {
			int l;
			if (flag) {
				seekTo(indexFile, j * 6);
				int k1;
				for (int i1 = 0; i1 < 6; i1 += k1) {
					k1 = indexFile.read(buffer, i1, 6 - i1);
					if (k1 == -1) {
						return false;
					}
				}

				l = ((buffer[3] & 0xff) << 16) + ((buffer[4] & 0xff) << 8) + (buffer[5] & 0xff);
				if (l <= 0 || l > dataFile.length() / 520L) {
					return false;
				}
			} else {
				l = (int) ((dataFile.length() + 519L) / 520L);
				if (l == 0) {
					l = 1;
				}
			}
			buffer[0] = (byte) (k >> 16);
			buffer[1] = (byte) (k >> 8);
			buffer[2] = (byte) k;
			buffer[3] = (byte) (l >> 16);
			buffer[4] = (byte) (l >> 8);
			buffer[5] = (byte) l;
			seekTo(indexFile, j * 6);
			indexFile.write(buffer, 0, 6);
			int j1 = 0;
			for (int l1 = 0; j1 < k; l1++) {
				int i2 = 0;
				if (flag) {
					seekTo(dataFile, l * 520);
					int j2;
					int l2;
					for (j2 = 0; j2 < 8; j2 += l2) {
						l2 = dataFile.read(buffer, j2, 8 - j2);
						if (l2 == -1) {
							break;
						}
					}

					if (j2 == 8) {
						int i3 = ((buffer[0] & 0xff) << 8) + (buffer[1] & 0xff);
						int j3 = ((buffer[2] & 0xff) << 8) + (buffer[3] & 0xff);
						i2 = ((buffer[4] & 0xff) << 16) + ((buffer[5] & 0xff) << 8) + (buffer[6] & 0xff);
						int k3 = buffer[7] & 0xff;
						if (i3 != j || j3 != l1 || k3 != anInt311) {
							return false;
						}
						if (i2 < 0 || i2 > dataFile.length() / 520L) {
							return false;
						}
					}
				}
				if (i2 == 0) {
					flag = false;
					i2 = (int) ((dataFile.length() + 519L) / 520L);
					if (i2 == 0) {
						i2++;
					}
					if (i2 == l) {
						i2++;
					}
				}
				if (k - j1 <= 512) {
					i2 = 0;
				}
				buffer[0] = (byte) (j >> 8);
				buffer[1] = (byte) j;
				buffer[2] = (byte) (l1 >> 8);
				buffer[3] = (byte) l1;
				buffer[4] = (byte) (i2 >> 16);
				buffer[5] = (byte) (i2 >> 8);
				buffer[6] = (byte) i2;
				buffer[7] = (byte) anInt311;
				seekTo(dataFile, l * 520);
				dataFile.write(buffer, 0, 8);
				int k2 = k - j1;
				if (k2 > 512) {
					k2 = 512;
				}
				dataFile.write(abyte0, j1, k2);
				j1 += k2;
				l = i2;
			}

			return true;
		} catch (IOException _ex) {
			return false;
		}
	}

	private synchronized void seekTo(RandomAccessFile randomaccessfile, int j) throws IOException {
		if (j < 0 || j > 0x3c00000) {
			System.out.println("Badseek - pos:" + j + " len:" + randomaccessfile.length());
			j = 0x3c00000;
			try {
				Thread.sleep(1000L);
			} catch (Exception _ex) {
			}
		}
		randomaccessfile.seek(j);
	}

	private static final byte[] buffer = new byte[520];
	private final RandomAccessFile dataFile;
	private final RandomAccessFile indexFile;
	private final int anInt311;

}