Buffer.java

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package com.runehive.fs.cache.decoder;
 
import com.runehive.net.codec.IsaacCipher;
 
import java.math.BigInteger;
import java.nio.ByteBuffer;
 
public final class Buffer {
 
 
    public void setOffset(int offset) {
        this.position = offset;
    }
 
    public int readSmart() {
        int value = array[position] & 0xff;
        if (value < 128)
            return readUnsignedByte() - 64;
        else
            return readUShort() - 49152;
    }
    public String readStringNew() {
        int i = position;
        while (array[position++] != 0)
            ;
        return new String(array, i, position - i - 1);
    }
 
    public int readShort2() {
        position += 2;
        int i = ((array[position - 2] & 0xff) << 8) + (array[position - 1] & 0xff);
        if (i > 60000)
            i = -65535 + i;
        return i;
 
    }
 
    public int readSignedShort() {
        this.position += 2;
        int value = ((this.array[this.position - 2] & 0xff) << 8) + (this.array[this.position - 1] & 0xff);
        if (value > 32767)
            value -= 0x10000; //theres no errors its just gradle being slow as fck
 
        return value;
    }
 
    public int readShortSmart()
    {
        int peek = array[position] & 0xFF;
        return peek < 128 ? this.readUnsignedByte() - 64 : this.readUnsignedShort() - 0xc000;
    }
 
    public int read24Int() {
        position += 3;
        return ((array[position - 3] & 0xff) << 16) + ((array[position - 2] & 0xff) << 8) + (array[position - 1] & 0xff);
    }
 
    public int readMedium() {
        this.position += 3;
        return ((this.array[this.position - 3] & 255) << 16) + (this.array[this.position - 1] & 255) + ((this.array[this.position - 2] & 255) << 8);
    }
 
 
    public int readUShort() {
        position += 2;
        return ((array[position - 2] & 0xff) << 8)
                + (array[position - 1] & 0xff);
    }
 
    public int readInt() {
        position += 4;
        return ((array[position - 4] & 0xff) << 24)
                + ((array[position - 3] & 0xff) << 16)
                + ((array[position - 2] & 0xff) << 8)
                + (array[position - 1] & 0xff);
    }
 
    public int readShort() {
        position += 2;
        int value = ((array[position - 2] & 0xff) << 8)
                + (array[position - 1] & 0xff);
 
        if (value > 32767) {
            value -= 0x10000;
        }
        return value;
    }
 
    public int readShortOSRS() {
        this.position += 2;
        int var1 = (this.array[this.position - 1] & 255) + ((this.array[this.position - 2] & 255) << 8);
        if (var1 > 32767) {
            var1 -= 65536;
        }
 
        return var1;
    }
 
    final int v(int i) {
        position += 3;
        return (0xff & array[position - 3] << 16) + (0xff & array[position - 2] << 8) + (0xff & array[position - 1]);
    }
 
    private Buffer() {
    }
 
    public Buffer(byte[] array) {
        this.array = array;
        position = 0;
    }
 
    public static Buffer fromByteBuffer(final ByteBuffer byteBuffer) {
        final byte[] array = new byte[byteBuffer.capacity()];
        byteBuffer.get(array);
        return new Buffer(array);
    }
 
    public int readUnsignedShortSmart()
    {
        int peek = this.peek() & 0xFF;
        return peek < 128 ? this.readUnsignedByte() : this.readUnsignedShort() - 0x8000;
    }
 
    public int readUnsignedIntSmartShortCompat()
    {
        int var1 = 0;
 
        int var2;
        for (var2 = this.readUnsignedShortSmart(); var2 == 32767; var2 = this.readUnsignedShortSmart())
        {
            var1 += 32767;
        }
 
        var1 += var2;
        return var1;
    }
 
    public int readUSmart2() {
        int baseVal = 0;
        int lastVal = 0;
        while ((lastVal = method422()) == 32767) {
            baseVal += 32767;
        }
        return baseVal + lastVal;
    }
 
    public String readNewString() {
        int i = position;
        while (array[position++] != 0)
            ;
        return new String(array, i, position - i - 1);
    }
 
    public void writeOpcode(int i) {
        // System.out.println("Frame: " + i);
        array[position++] = (byte) (i + encryption.getKey());
    }
 
    public void writeByte(int i) {
        array[position++] = (byte) i;
    }
 
    public void writeShort(int i) {
        array[position++] = (byte) (i >> 8);
        array[position++] = (byte) i;
    }
 
    public void writeDWordBigEndian(int i) {
        array[position++] = (byte) (i >> 16);
        array[position++] = (byte) (i >> 8);
        array[position++] = (byte) i;
    }
 
    public void writeDWord(int i) {
        array[position++] = (byte) (i >> 24);
        array[position++] = (byte) (i >> 16);
        array[position++] = (byte) (i >> 8);
        array[position++] = (byte) i;
    }
 
    public void method403(int j) {
        array[position++] = (byte) j;
        array[position++] = (byte) (j >> 8);
        array[position++] = (byte) (j >> 16);
        array[position++] = (byte) (j >> 24);
    }
 
    public void writeQWord(long l) {
        try {
            array[position++] = (byte) (int) (l >> 56);
            array[position++] = (byte) (int) (l >> 48);
            array[position++] = (byte) (int) (l >> 40);
            array[position++] = (byte) (int) (l >> 32);
            array[position++] = (byte) (int) (l >> 24);
            array[position++] = (byte) (int) (l >> 16);
            array[position++] = (byte) (int) (l >> 8);
            array[position++] = (byte) (int) l;
        } catch (RuntimeException runtimeexception) {
            throw new RuntimeException();
        }
    }
 
    public void writeString(String s) {
        // s.getBytes(0, s.length(), buffer, currentOffset); //deprecated
        System.arraycopy(s.getBytes(), 0, array, position, s.length());
        position += s.length();
        array[position++] = 10;
    }
 
    public void writeBytes(byte[] abyte0, int i, int j) {
        for (int k = j; k < j + i; k++)
            array[position++] = abyte0[k];
    }
 
    public void writeBytes(int i) {
        array[position - i - 1] = (byte) i;
    }
 
    public int readUnsignedByte() {
        return array[position++] & 0xff;
    }
 
    public int readSignedSmart() {
        int value = peek() & 0xff;
        if (value < 128)
            return this.readUnsignedByte() - 64;
        else
            return this.readUnsignedShort() - 49152;
    }
 
    public byte peek()
    {
        return array[position];
    }
 
    public int readUnsignedShortSmartMinusOne()
    {
        int peek = this.peek() & 0xFF;
        return peek < 128 ? this.readUnsignedByte() - 1 : this.readUnsignedShort() - 0x8001;
    }
 
    public int readBigSmart2()
    {
        if (peek() < 0)
        {
            return readInt() & Integer.MAX_VALUE; // and off sign bit
        }
        int value = readUnsignedShort();
        return value == 32767 ? -1 : value;
    }
 
    public byte readSignedByte() {
        return array[position++];
    }
 
    public int readUnsignedShort() {
        position += 2;
        return ((array[position - 2] & 0xff) << 8) + (array[position - 1] & 0xff);
    }
 
    public int readSignedWord() {
        position += 2;
        int i = ((array[position - 2] & 0xff) << 8) + (array[position - 1] & 0xff);
        if (i > 32767) {
            i -= 0x10000;
        }
        return i;
    }
 
    public int getUIncrementalSmart() {
        int value = 0, remainder;
        for (remainder = method422(); remainder == 32767; remainder = method422()) {
            value += 32767;
        }
        value += remainder;
        return value;
    }
 
    public int readUnsignedTriByte() {
        position += 3;
        return ((array[position - 3] & 0xff) << 16) + ((array[position - 2] & 0xff) << 8) + (array[position - 1] & 0xff);
    }
 
    public int readUnsignedInt() {
        position += 4;
        return ((array[position - 4] & 0xff) << 24) + ((array[position - 3] & 0xff) << 16) + ((array[position - 2] & 0xff) << 8) + (array[position - 1] & 0xff);
    }
 
    public long readUnsignedLong() {
        long big = (long) readUnsignedInt() & 0xFFFF_FFFFL;
        long little = (long) readUnsignedInt() & 0xFFFF_FFFFL;
        return (big << 32) + little;
    }
 
    public String readString() {
        int start = position;
        while (array[position++] != 10);
        return new String(array, start, position - start - 1);
    }
 
    public String readStringCp1252NullTerminated() {
        int var1 = this.position;
 
        while(this.array[++this.position - 1] != 0) {
            ;
        }
 
        int var2 = this.position - var1 - 1;
        return var2 == 0 ? "" : decodeStringCp1252(this.array, var1, var2);
    }
 
    public static String decodeStringCp1252(byte[] var0, int var1, int var2) {
        char[] var3 = new char[var2];
        int var4 = 0;
 
        for(int var5 = 0; var5 < var2; ++var5) {
            int var6 = var0[var5 + var1] & 255;
            if (var6 != 0) {
                if (var6 >= 128 && var6 < 160) {
                    char var7 = cp1252AsciiExtension[var6 - 128];
                    if (var7 == 0) {
                        var7 = '?';
                    }
 
                    var6 = var7;
                }
 
                var3[var4++] = (char)var6;
            }
        }
 
        return new String(var3, 0, var4);
    }
 
    public static final char[] cp1252AsciiExtension = new char[]{'€', '\u0000', '‚', 'ƒ', '„', '…', '†', '‡', 'ˆ', '‰', 'Š', '‹', 'Œ', '\u0000', 'Ž', '\u0000', '\u0000', '‘', '’', '“', '”', '•', '–', '—', '˜', '™', 'š', '›', 'œ', '\u0000', 'ž', 'Ÿ'};
 
    public byte[] readBytes() {
        int start = position;
        while (array[position++] != 10);
        byte[] bytes = new byte[position - start - 1];
        System.arraycopy(array, start, bytes, start - start, position - 1 - start);
        return bytes;
    }
 
    public void readBytes(int amount, int offset, byte[] destination) {
        for (int l = offset; l < offset + amount; l++)
            destination[l] = array[position++];
    }
 
    public void initBitAccess() {
        bitPosition = position * 8;
    }
 
    public int readBits(int amount) {
        int bytePos = bitPosition >> 3;
        int bitOffset = 8 - (bitPosition & 7);
        int value = 0;
 
        bitPosition += amount;
 
        for (; amount > bitOffset; bitOffset = 8) {
            value += (array[bytePos++] & BIT_MASK[bitOffset]) << amount - bitOffset;
            amount -= bitOffset;
        }
 
        if (amount == bitOffset) {
            value += array[bytePos] & BIT_MASK[bitOffset];
        } else {
            value += array[bytePos] >> bitOffset - amount & BIT_MASK[amount];
        }
 
        return value;
    }
 
    public void finishBitAccess() {
        position = (bitPosition + 7) / 8;
    }
 
    public int method421() {
        int i = array[position] & 0xff;
        if (i < 128)
            return readUnsignedByte() - 64;
        else
            return readUnsignedShort() - 49152;
    }
 
    public int method422() {
        int i = array[position] & 0xff;
        if (i < 128)
            return readUnsignedByte();
        else
            return readUnsignedShort() - 32768;
    }
 
    public void encodeRSA(BigInteger exponent, BigInteger modulus) {
        int i = position;
        position = 0;
        byte[] abyte0 = new byte[i];
        readBytes(i, 0, abyte0);
 
        byte[] rsa = new BigInteger(abyte0).modPow(exponent, modulus).toByteArray();
 
        position = 0;
        writeByte(rsa.length);
        writeBytes(rsa, rsa.length, 0);
    }
 
    public void writeNegatedByte(int i) {
        array[position++] = (byte) (-i);
    }
 
    public void method425(int j) {
        array[position++] = (byte) (128 - j);
    }
 
    public int readUByteA() {
        return array[position++] - 128 & 0xff;
    }
 
    public int readNegUByte() {
        return -array[position++] & 0xff;
    }
 
    public int readUByteS() {
        return 128 - array[position++] & 0xff;
    }
 
    public byte method429() {
        return (byte) (-array[position++]);
    }
 
    public byte method430() {
        return (byte) (128 - array[position++]);
    }
 
    public void writeLEShort(int i) {
        array[position++] = (byte) i;
        array[position++] = (byte) (i >> 8);
    }
 
    public void writeShortA(int j) {
        array[position++] = (byte) (j >> 8);
        array[position++] = (byte) (j + 128);
    }
 
    public void writeLEShortA(int j) {
        array[position++] = (byte) (j + 128);
        array[position++] = (byte) (j >> 8);
    }
 
    public int readLEUShort() {
        position += 2;
        return ((array[position - 1] & 0xff) << 8) + (array[position - 2] & 0xff);
    }
 
    public int readUShortA() {
        position += 2;
        return ((array[position - 2] & 0xff) << 8) + (array[position - 1] - 128 & 0xff);
    }
 
    public int readLEUShortA() {
        position += 2;
        return ((array[position - 1] & 0xff) << 8) + (array[position - 2] - 128 & 0xff);
    }
 
    public int readLEShort() {
        position += 2;
        int j = ((array[position - 1] & 0xff) << 8) + (array[position - 2] & 0xff);
        if (j > 32767)
            j -= 0x10000;
        return j;
    }
 
    public int method438() {
        position += 2;
        int j = ((array[position - 1] & 0xff) << 8) + (array[position - 2] - 128 & 0xff);
        if (j > 32767)
            j -= 0x10000;
        return j;
    }
 
    public int method439() {
        position += 4;
        return ((array[position - 2] & 0xff) << 24) + ((array[position - 1] & 0xff) << 16) + ((array[position - 4] & 0xff) << 8) + (array[position - 3] & 0xff);
    }
 
    public int method440() {
        position += 4;
        return ((array[position - 3] & 0xff) << 24) + ((array[position - 4] & 0xff) << 16) + ((array[position - 1] & 0xff) << 8) + (array[position - 2] & 0xff);
    }
 
    public void method441(int i, byte[] abyte0, int j) {
        for (int k = (i + j) - 1; k >= i; k--)
            array[position++] = (byte) (abyte0[k] + 128);
 
    }
 
    public void readReverseData(int i, int j, byte[] abyte0) {
        for (int k = (j + i) - 1; k >= j; k--)
            abyte0[k] = array[position++];
 
    }
 
    public float readFloat() {
        return Float.intBitsToFloat(readInt());
    }
 
    public byte[] readBytes(final int length) {
        final byte[] bytes = new byte[length];
        System.arraycopy(array, position, bytes, 0, length);
        position += length;
        return bytes;
    }
 
    public byte[] array;
    public int position;
    public int bitPosition;
    private static final int[] BIT_MASK = {0, 1, 3, 7, 15, 31, 63, 127, 255, 511, 1023, 2047, 4095, 8191, 16383, 32767, 65535, 0x1ffff, 0x3ffff, 0x7ffff, 0xfffff, 0x1fffff, 0x3fffff, 0x7fffff, 0xffffff, 0x1ffffff, 0x3ffffff, 0x7ffffff, 0xfffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff, -1};
    public IsaacCipher encryption;
    private static int anInt1412;
 
    public void setPosition(int offset) {
        this.position = offset;
    }
}