// 
// Decompiled by Procyon v0.6.0
// 

package io.netty.handler.codec.http3;

import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.ConstantTimeUtils;
import io.netty.util.AsciiString;
import io.netty.util.internal.ObjectUtil;
import io.netty.buffer.ByteBuf;

final class QpackUtil
{
    private static final QpackException PREFIXED_INTEGER_TOO_LONG;
    static final int[] HUFFMAN_CODES;
    static final byte[] HUFFMAN_CODE_LENGTHS;
    static final int HUFFMAN_EOS = 256;
    static final long MIN_HEADER_TABLE_SIZE = 0L;
    static final long MAX_UNSIGNED_INT = 4294967295L;
    static final long MAX_HEADER_TABLE_SIZE = 4294967295L;
    
    static void encodePrefixedInteger(final ByteBuf out, final byte mask, final int prefixLength, final long toEncode) {
        ObjectUtil.checkInRange(toEncode, 0L, 4294967295L, "toEncode");
        final int nbits = (1 << prefixLength) - 1;
        if (toEncode < nbits) {
            out.writeByte((byte)((long)mask | toEncode));
        }
        else {
            out.writeByte((byte)(mask | nbits));
            long remainder;
            for (remainder = toEncode - nbits; remainder > 128L; remainder /= 128L) {
                final byte next = (byte)(remainder % 128L | 0x80L);
                out.writeByte(next);
            }
            out.writeByte((byte)remainder);
        }
    }
    
    static int decodePrefixedIntegerAsInt(final ByteBuf in, final int prefixLength) throws QpackException {
        return toIntOrThrow(decodePrefixedInteger(in, prefixLength));
    }
    
    static int toIntOrThrow(final long aLong) throws QpackException {
        if ((int)aLong != aLong) {
            throw QpackUtil.PREFIXED_INTEGER_TOO_LONG;
        }
        return (int)aLong;
    }
    
    static long decodePrefixedInteger(final ByteBuf in, final int prefixLength) {
        final int readerIndex = in.readerIndex();
        final int writerIndex = in.writerIndex();
        if (readerIndex == writerIndex) {
            return -1L;
        }
        final int nbits = (1 << prefixLength) - 1;
        final int first = in.readByte() & nbits;
        if (first < nbits) {
            return first;
        }
        int idx = readerIndex + 1;
        long i = first;
        int factor = 0;
        while (idx != writerIndex) {
            final byte next = in.getByte(idx++);
            i += ((long)next & 0x7FL) << factor;
            factor += 7;
            if ((next & 0x80) != 0x80) {
                in.readerIndex(idx);
                return i;
            }
        }
        in.readerIndex(readerIndex);
        return -1L;
    }
    
    static boolean firstByteEquals(final ByteBuf in, final byte mask) {
        return (in.getByte(in.readerIndex()) & mask) == mask;
    }
    
    static int equalsConstantTime(final CharSequence s1, final CharSequence s2) {
        if (!(s1 instanceof AsciiString) || !(s2 instanceof AsciiString)) {
            return ConstantTimeUtils.equalsConstantTime(s1, s2);
        }
        if (s1.length() != s2.length()) {
            return 0;
        }
        final AsciiString s1Ascii = (AsciiString)s1;
        final AsciiString s2Ascii = (AsciiString)s2;
        return PlatformDependent.equalsConstantTime(s1Ascii.array(), s1Ascii.arrayOffset(), s2Ascii.array(), s2Ascii.arrayOffset(), s1.length());
    }
    
    static boolean equalsVariableTime(final CharSequence s1, final CharSequence s2) {
        return AsciiString.contentEquals(s1, s2);
    }
    
    static long maxEntries(final long maxTableCapacity) {
        return Math.floorDiv(maxTableCapacity, 32L);
    }
    
    private QpackUtil() {
    }
    
    static {
        PREFIXED_INTEGER_TOO_LONG = QpackException.newStatic(QpackDecoder.class, "toIntOrThrow(...)", "QPACK - invalid prefixed integer");
        HUFFMAN_CODES = new int[] { 8184, 8388568, 268435426, 268435427, 268435428, 268435429, 268435430, 268435431, 268435432, 16777194, 1073741820, 268435433, 268435434, 1073741821, 268435435, 268435436, 268435437, 268435438, 268435439, 268435440, 268435441, 268435442, 1073741822, 268435443, 268435444, 268435445, 268435446, 268435447, 268435448, 268435449, 268435450, 268435451, 20, 1016, 1017, 4090, 8185, 21, 248, 2042, 1018, 1019, 249, 2043, 250, 22, 23, 24, 0, 1, 2, 25, 26, 27, 28, 29, 30, 31, 92, 251, 32764, 32, 4091, 1020, 8186, 33, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 252, 115, 253, 8187, 524272, 8188, 16380, 34, 32765, 3, 35, 4, 36, 5, 37, 38, 39, 6, 116, 117, 40, 41, 42, 7, 43, 118, 44, 8, 9, 45, 119, 120, 121, 122, 123, 32766, 2044, 16381, 8189, 268435452, 1048550, 4194258, 1048551, 1048552, 4194259, 4194260, 4194261, 8388569, 4194262, 8388570, 8388571, 8388572, 8388573, 8388574, 16777195, 8388575, 16777196, 16777197, 4194263, 8388576, 16777198, 8388577, 8388578, 8388579, 8388580, 2097116, 4194264, 8388581, 4194265, 8388582, 8388583, 16777199, 4194266, 2097117, 1048553, 4194267, 4194268, 8388584, 8388585, 2097118, 8388586, 4194269, 4194270, 16777200, 2097119, 4194271, 8388587, 8388588, 2097120, 2097121, 4194272, 2097122, 8388589, 4194273, 8388590, 8388591, 1048554, 4194274, 4194275, 4194276, 8388592, 4194277, 4194278, 8388593, 67108832, 67108833, 1048555, 524273, 4194279, 8388594, 4194280, 33554412, 67108834, 67108835, 67108836, 134217694, 134217695, 67108837, 16777201, 33554413, 524274, 2097123, 67108838, 134217696, 134217697, 67108839, 134217698, 16777202, 2097124, 2097125, 67108840, 67108841, 268435453, 134217699, 134217700, 134217701, 1048556, 16777203, 1048557, 2097126, 4194281, 2097127, 2097128, 8388595, 4194282, 4194283, 33554414, 33554415, 16777204, 16777205, 67108842, 8388596, 67108843, 134217702, 67108844, 67108845, 134217703, 134217704, 134217705, 134217706, 134217707, 268435454, 134217708, 134217709, 134217710, 134217711, 134217712, 67108846, 1073741823 };
        HUFFMAN_CODE_LENGTHS = new byte[] { 13, 23, 28, 28, 28, 28, 28, 28, 28, 24, 30, 28, 28, 30, 28, 28, 28, 28, 28, 28, 28, 28, 30, 28, 28, 28, 28, 28, 28, 28, 28, 28, 6, 10, 10, 12, 13, 6, 8, 11, 10, 10, 8, 11, 8, 6, 6, 6, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 7, 8, 15, 6, 12, 10, 13, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 7, 8, 13, 19, 13, 14, 6, 15, 5, 6, 5, 6, 5, 6, 6, 6, 5, 7, 7, 6, 6, 6, 5, 6, 7, 6, 5, 5, 6, 7, 7, 7, 7, 7, 15, 11, 14, 13, 28, 20, 22, 20, 20, 22, 22, 22, 23, 22, 23, 23, 23, 23, 23, 24, 23, 24, 24, 22, 23, 24, 23, 23, 23, 23, 21, 22, 23, 22, 23, 23, 24, 22, 21, 20, 22, 22, 23, 23, 21, 23, 22, 22, 24, 21, 22, 23, 23, 21, 21, 22, 21, 23, 22, 23, 23, 20, 22, 22, 22, 23, 22, 22, 23, 26, 26, 20, 19, 22, 23, 22, 25, 26, 26, 26, 27, 27, 26, 24, 25, 19, 21, 26, 27, 27, 26, 27, 24, 21, 21, 26, 26, 28, 27, 27, 27, 20, 24, 20, 21, 22, 21, 21, 23, 22, 22, 25, 25, 24, 24, 26, 23, 26, 27, 26, 26, 27, 27, 27, 27, 27, 28, 27, 27, 27, 27, 27, 26, 30 };
    }
    
    enum IndexType
    {
        INCREMENTAL, 
        NONE, 
        NEVER;
    }
}