Ejemplo n.º 1
0
        internal static int inflate_trees_dynamic(int nl, int nd, int[] c, int[] bl, int[] bd, int[] tl, int[] td, int[] hp, ZStream z)
        {
            int r;
            int[] hn = new int[1]; // hufts used in space
            int[] v = new int[288]; // work area for huft_build

            // build literal/length tree
            r = huft_build(c, 0, nl, 257, cplens, cplext, tl, bl, hp, hn, v);
            if (r != Z_OK || bl[0] == 0)
            {
                if (r == Z_DATA_ERROR)
                {
                    z.msg = "oversubscribed literal/length tree";
                }
                else if (r != Z_MEM_ERROR)
                {
                    z.msg = "incomplete literal/length tree";
                    r = Z_DATA_ERROR;
                }
                return r;
            }

            // build distance tree
            r = huft_build(c, nl, nd, 0, cpdist, cpdext, td, bd, hp, hn, v);

            if (r != Z_OK || (bd[0] == 0 && nl > 257))
            {
                if (r == Z_DATA_ERROR)
                {
                    z.msg = "oversubscribed distance tree";
                }
                else if (r == Z_BUF_ERROR)
                {
                    z.msg = "incomplete distance tree";
                    r = Z_DATA_ERROR;
                }
                else if (r != Z_MEM_ERROR)
                {
                    z.msg = "empty distance tree with lengths";
                    r = Z_DATA_ERROR;
                }
                return r;
            }

            return Z_OK;
        }
Ejemplo n.º 2
0
        internal int inflateReset(ZStream z)
        {
            if (z == null || z.istate == null)
                return Z_STREAM_ERROR;

            z.total_in = z.total_out = 0;
            z.msg = null;
            z.istate.mode = z.istate.nowrap != 0?BLOCKS:METHOD;
            z.istate.blocks.reset(z, null);
            return Z_OK;
        }
Ejemplo n.º 3
0
 internal InfCodes(int bl, int bd, int[] tl, int[] td, ZStream z)
 {
     mode = START;
     lbits = (byte) bl;
     dbits = (byte) bd;
     ltree = tl;
     ltree_index = 0;
     dtree = td;
     dtree_index = 0;
 }
Ejemplo n.º 4
0
        // Called with number of bytes left to write in window at least 258
        // (the maximum string length) and number of input bytes available
        // at least ten.  The ten bytes are six bytes for the longest length/
        // distance pair plus four bytes for overloading the bit buffer.
        internal int inflate_fast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InfBlocks s, ZStream z)
        {
            int t; // temporary pointer
            int[] tp; // temporary pointer
            int tp_index; // temporary pointer
            int e; // extra bits or operation
            int b; // bit buffer
            int k; // bits in bit buffer
            int p; // input data pointer
            int n; // bytes available there
            int q; // output window write pointer
            int m; // bytes to end of window or read pointer
            int ml; // mask for literal/length tree
            int md; // mask for distance tree
            int c; // bytes to copy
            int d; // distance back to copy from
            int r; // copy source pointer

            // load input, output, bit values
            p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk;
            q = s.write; m = q < s.read?s.read - q - 1:s.end - q;

            // initialize masks
            ml = inflate_mask[bl];
            md = inflate_mask[bd];

            // do until not enough input or output space for fast loop
            do
            {
                // assume called with m >= 258 && n >= 10
                // get literal/length code
                while (k < (20))
                {
                    // max bits for literal/length code
                    n--;
                    b |= (z.next_in[p++] & 0xff) << k; k += 8;
                }

                t = b & ml;
                tp = tl;
                tp_index = tl_index;
                if ((e = tp[(tp_index + t) * 3]) == 0)
                {
                    b >>= (tp[(tp_index + t) * 3 + 1]); k -= (tp[(tp_index + t) * 3 + 1]);

                    s.window[q++] = (byte) tp[(tp_index + t) * 3 + 2];
                    m--;
                    continue;
                }
                do
                {

                    b >>= (tp[(tp_index + t) * 3 + 1]); k -= (tp[(tp_index + t) * 3 + 1]);

                    if ((e & 16) != 0)
                    {
                        e &= 15;
                        c = tp[(tp_index + t) * 3 + 2] + ((int) b & inflate_mask[e]);

                        b >>= e; k -= e;

                        // decode distance base of block to copy
                        while (k < (15))
                        {
                            // max bits for distance code
                            n--;
                            b |= (z.next_in[p++] & 0xff) << k; k += 8;
                        }

                        t = b & md;
                        tp = td;
                        tp_index = td_index;
                        e = tp[(tp_index + t) * 3];

                        do
                        {

                            b >>= (tp[(tp_index + t) * 3 + 1]); k -= (tp[(tp_index + t) * 3 + 1]);

                            if ((e & 16) != 0)
                            {
                                // get extra bits to add to distance base
                                e &= 15;
                                while (k < (e))
                                {
                                    // get extra bits (up to 13)
                                    n--;
                                    b |= (z.next_in[p++] & 0xff) << k; k += 8;
                                }

                                d = tp[(tp_index + t) * 3 + 2] + (b & inflate_mask[e]);

                                b >>= (e); k -= (e);

                                // do the copy
                                m -= c;
                                if (q >= d)
                                {
                                    // offset before dest
                                    //  just copy
                                    r = q - d;
                                    if (q - r > 0 && 2 > (q - r))
                                    {
                                        s.window[q++] = s.window[r++]; c--; // minimum count is three,
                                        s.window[q++] = s.window[r++]; c--; // so unroll loop a little
                                    }
                                    else
                                    {
                                        Array.Copy(s.window, r, s.window, q, 2);
                                        q += 2; r += 2; c -= 2;
                                    }
                                }
                                else
                                {
                                    // else offset after destination
                                    r = q - d;
                                    do
                                    {
                                        r += s.end; // force pointer in window
                                    }
                                    while (r < 0); // covers invalid distances
                                    e = s.end - r;
                                    if (c > e)
                                    {
                                        // if source crosses,
                                        c -= e; // wrapped copy
                                        if (q - r > 0 && e > (q - r))
                                        {
                                            do
                                            {
                                                s.window[q++] = s.window[r++];
                                            }
                                            while (--e != 0);
                                        }
                                        else
                                        {
                                            Array.Copy(s.window, r, s.window, q, e);
                                            q += e; r += e; e = 0;
                                        }
                                        r = 0; // copy rest from start of window
                                    }
                                }

                                // copy all or what's left
                                if (q - r > 0 && c > (q - r))
                                {
                                    do
                                    {
                                        s.window[q++] = s.window[r++];
                                    }
                                    while (--c != 0);
                                }
                                else
                                {
                                    Array.Copy(s.window, r, s.window, q, c);
                                    q += c; r += c; c = 0;
                                }
                                break;
                            }
                            else if ((e & 64) == 0)
                            {
                                t += tp[(tp_index + t) * 3 + 2];
                                t += (b & inflate_mask[e]);
                                e = tp[(tp_index + t) * 3];
                            }
                            else
                            {
                                z.msg = "invalid distance code";

                                c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= (c << 3);

                                s.bitb = b; s.bitk = k;
                                z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                s.write = q;

                                return Z_DATA_ERROR;
                            }
                        }
                        while (true);
                        break;
                    }

                    if ((e & 64) == 0)
                    {
                        t += tp[(tp_index + t) * 3 + 2];
                        t += (b & inflate_mask[e]);
                        if ((e = tp[(tp_index + t) * 3]) == 0)
                        {

                            b >>= (tp[(tp_index + t) * 3 + 1]); k -= (tp[(tp_index + t) * 3 + 1]);

                            s.window[q++] = (byte) tp[(tp_index + t) * 3 + 2];
                            m--;
                            break;
                        }
                    }
                    else if ((e & 32) != 0)
                    {

                        c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= (c << 3);

                        s.bitb = b; s.bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        s.write = q;

                        return Z_STREAM_END;
                    }
                    else
                    {
                        z.msg = "invalid literal/length code";

                        c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= (c << 3);

                        s.bitb = b; s.bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        s.write = q;

                        return Z_DATA_ERROR;
                    }
                }
                while (true);
            }
            while (m >= 258 && n >= 10);

            // not enough input or output--restore pointers and return
            c = z.avail_in - n; c = (k >> 3) < c?k >> 3:c; n += c; p -= c; k -= (c << 3);

            s.bitb = b; s.bitk = k;
            z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
            s.write = q;

            return Z_OK;
        }
Ejemplo n.º 5
0
 internal void free(ZStream z)
 {
     reset(z, null);
     window = null;
     hufts = null;
     //ZFREE(z, s);
 }
Ejemplo n.º 6
0
        internal int proc(ZStream z, int r)
        {
            int t; // temporary storage
            int b; // bit buffer
            int k; // bits in bit buffer
            int p; // input data pointer
            int n; // bytes available there
            int q; // output window write pointer
            int m; // bytes to end of window or read pointer

            // copy input/output information to locals (UPDATE macro restores)
            {
                p = z.next_in_index; n = z.avail_in; b = bitb; k = bitk;
            }
            {
                q = write; m = (int) (q < read?read - q - 1:end - q);
            }

            // process input based on current state
            while (true)
            {
                switch (mode)
                {

                    case TYPE:

                        while (k < (3))
                        {
                            if (n != 0)
                            {
                                r = Z_OK;
                            }
                            else
                            {
                                bitb = b; bitk = k;
                                z.avail_in = n;
                                z.total_in += p - z.next_in_index; z.next_in_index = p;
                                write = q;
                                return inflate_flush(z, r);
                            }
                            ;
                            n--;
                            b |= (z.next_in[p++] & 0xff) << k;
                            k += 8;
                        }
                        t = (int) (b & 7);
                        last = t & 1;

                        switch (SupportClass.URShift(t, 1))
                        {

                            case 0:  // stored
                                {
                                    b = SupportClass.URShift(b, (3)); k -= (3);
                                }
                                t = k & 7; // go to byte boundary

                                {
                                    b = SupportClass.URShift(b, (t)); k -= (t);
                                }
                                mode = LENS; // get length of stored block
                                break;

                            case 1:  // fixed
                                {
                                    int[] bl = new int[1];
                                    int[] bd = new int[1];
                                    int[][] tl = new int[1][];
                                    int[][] td = new int[1][];

                                    InfTree.inflate_trees_fixed(bl, bd, tl, td, z);
                                    codes = new InfCodes(bl[0], bd[0], tl[0], td[0], z);
                                }

                                {
                                    b = SupportClass.URShift(b, (3)); k -= (3);
                                }

                                mode = CODES;
                                break;

                            case 2:  // dynamic

                                {
                                    b = SupportClass.URShift(b, (3)); k -= (3);
                                }

                                mode = TABLE;
                                break;

                            case 3:  // illegal

                                {
                                    b = SupportClass.URShift(b, (3)); k -= (3);
                                }
                                mode = BAD;
                                z.msg = "invalid block type";
                                r = Z_DATA_ERROR;

                                bitb = b; bitk = k;
                                z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                write = q;
                                return inflate_flush(z, r);
                            }
                        break;

                    case LENS:

                        while (k < (32))
                        {
                            if (n != 0)
                            {
                                r = Z_OK;
                            }
                            else
                            {
                                bitb = b; bitk = k;
                                z.avail_in = n;
                                z.total_in += p - z.next_in_index; z.next_in_index = p;
                                write = q;
                                return inflate_flush(z, r);
                            }
                            ;
                            n--;
                            b |= (z.next_in[p++] & 0xff) << k;
                            k += 8;
                        }

                        if (((SupportClass.URShift((~ b), 16)) & 0xffff) != (b & 0xffff))
                        {
                            mode = BAD;
                            z.msg = "invalid stored block lengths";
                            r = Z_DATA_ERROR;

                            bitb = b; bitk = k;
                            z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                            write = q;
                            return inflate_flush(z, r);
                        }
                        left = (b & 0xffff);
                        b = k = 0; // dump bits
                        mode = left != 0?STORED:(last != 0?DRY:TYPE);
                        break;

                    case STORED:
                        if (n == 0)
                        {
                            bitb = b; bitk = k;
                            z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                            write = q;
                            return inflate_flush(z, r);
                        }

                        if (m == 0)
                        {
                            if (q == end && read != 0)
                            {
                                q = 0; m = (int) (q < read?read - q - 1:end - q);
                            }
                            if (m == 0)
                            {
                                write = q;
                                r = inflate_flush(z, r);
                                q = write; m = (int) (q < read?read - q - 1:end - q);
                                if (q == end && read != 0)
                                {
                                    q = 0; m = (int) (q < read?read - q - 1:end - q);
                                }
                                if (m == 0)
                                {
                                    bitb = b; bitk = k;
                                    z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                    write = q;
                                    return inflate_flush(z, r);
                                }
                            }
                        }
                        r = Z_OK;

                        t = left;
                        if (t > n)
                            t = n;
                        if (t > m)
                            t = m;
                        Array.Copy(z.next_in, p, window, q, t);
                        p += t; n -= t;
                        q += t; m -= t;
                        if ((left -= t) != 0)
                            break;
                        mode = last != 0?DRY:TYPE;
                        break;

                    case TABLE:

                        while (k < (14))
                        {
                            if (n != 0)
                            {
                                r = Z_OK;
                            }
                            else
                            {
                                bitb = b; bitk = k;
                                z.avail_in = n;
                                z.total_in += p - z.next_in_index; z.next_in_index = p;
                                write = q;
                                return inflate_flush(z, r);
                            }
                            ;
                            n--;
                            b |= (z.next_in[p++] & 0xff) << k;
                            k += 8;
                        }

                        table = t = (b & 0x3fff);
                        if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
                        {
                            mode = BAD;
                            z.msg = "too many length or distance symbols";
                            r = Z_DATA_ERROR;

                            bitb = b; bitk = k;
                            z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                            write = q;
                            return inflate_flush(z, r);
                        }
                        t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
                        blens = new int[t];

                        {
                            b = SupportClass.URShift(b, (14)); k -= (14);
                        }

                        index = 0;
                        mode = BTREE;
                        goto case BTREE;

                    case BTREE:
                        while (index < 4 + (SupportClass.URShift(table, 10)))
                        {
                            while (k < (3))
                            {
                                if (n != 0)
                                {
                                    r = Z_OK;
                                }
                                else
                                {
                                    bitb = b; bitk = k;
                                    z.avail_in = n;
                                    z.total_in += p - z.next_in_index; z.next_in_index = p;
                                    write = q;
                                    return inflate_flush(z, r);
                                }
                                ;
                                n--;
                                b |= (z.next_in[p++] & 0xff) << k;
                                k += 8;
                            }

                            blens[border[index++]] = b & 7;

                            {
                                b = SupportClass.URShift(b, (3)); k -= (3);
                            }
                        }

                        while (index < 19)
                        {
                            blens[border[index++]] = 0;
                        }

                        bb[0] = 7;
                        t = InfTree.inflate_trees_bits(blens, bb, tb, hufts, z);
                        if (t != Z_OK)
                        {
                            r = t;
                            if (r == Z_DATA_ERROR)
                            {
                                blens = null;
                                mode = BAD;
                            }

                            bitb = b; bitk = k;
                            z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                            write = q;
                            return inflate_flush(z, r);
                        }

                        index = 0;
                        mode = DTREE;
                        goto case DTREE;

                    case DTREE:
                        while (true)
                        {
                            t = table;
                            if (!(index < 258 + (t & 0x1f) + ((t >> 5) & 0x1f)))
                            {
                                break;
                            }

                            int i, j, c;

                            t = bb[0];

                            while (k < (t))
                            {
                                if (n != 0)
                                {
                                    r = Z_OK;
                                }
                                else
                                {
                                    bitb = b; bitk = k;
                                    z.avail_in = n;
                                    z.total_in += p - z.next_in_index; z.next_in_index = p;
                                    write = q;
                                    return inflate_flush(z, r);
                                }
                                ;
                                n--;
                                b |= (z.next_in[p++] & 0xff) << k;
                                k += 8;
                            }

                            if (tb[0] == - 1)
                            {
                                //System.err.println("null...");
                            }

                            t = hufts[(tb[0] + (b & inflate_mask[t])) * 3 + 1];
                            c = hufts[(tb[0] + (b & inflate_mask[t])) * 3 + 2];

                            if (c < 16)
                            {
                                b = SupportClass.URShift(b, (t)); k -= (t);
                                blens[index++] = c;
                            }
                            else
                            {
                                // c == 16..18
                                i = c == 18?7:c - 14;
                                j = c == 18?11:3;

                                while (k < (t + i))
                                {
                                    if (n != 0)
                                    {
                                        r = Z_OK;
                                    }
                                    else
                                    {
                                        bitb = b; bitk = k;
                                        z.avail_in = n;
                                        z.total_in += p - z.next_in_index; z.next_in_index = p;
                                        write = q;
                                        return inflate_flush(z, r);
                                    }
                                    ;
                                    n--;
                                    b |= (z.next_in[p++] & 0xff) << k;
                                    k += 8;
                                }

                                b = SupportClass.URShift(b, (t)); k -= (t);

                                j += (b & inflate_mask[i]);

                                b = SupportClass.URShift(b, (i)); k -= (i);

                                i = index;
                                t = table;
                                if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) || (c == 16 && i < 1))
                                {
                                    blens = null;
                                    mode = BAD;
                                    z.msg = "invalid bit length repeat";
                                    r = Z_DATA_ERROR;

                                    bitb = b; bitk = k;
                                    z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                    write = q;
                                    return inflate_flush(z, r);
                                }

                                c = c == 16?blens[i - 1]:0;
                                do
                                {
                                    blens[i++] = c;
                                }
                                while (--j != 0);
                                index = i;
                            }
                        }

                        tb[0] = - 1;
                        {
                            int[] bl = new int[1];
                            int[] bd = new int[1];
                            int[] tl = new int[1];
                            int[] td = new int[1];

                            bl[0] = 9; // must be <= 9 for lookahead assumptions
                            bd[0] = 6; // must be <= 9 for lookahead assumptions
                            t = table;
                            t = InfTree.inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f), blens, bl, bd, tl, td, hufts, z);
                            if (t != Z_OK)
                            {
                                if (t == Z_DATA_ERROR)
                                {
                                    blens = null;
                                    mode = BAD;
                                }
                                r = t;

                                bitb = b; bitk = k;
                                z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                write = q;
                                return inflate_flush(z, r);
                            }

                            codes = new InfCodes(bl[0], bd[0], hufts, tl[0], hufts, td[0], z);
                        }
                        blens = null;
                        mode = CODES;
                        goto case CODES;

                    case CODES:
                        bitb = b; bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        write = q;

                        if ((r = codes.proc(this, z, r)) != Z_STREAM_END)
                        {
                            return inflate_flush(z, r);
                        }
                        r = Z_OK;
                        codes.free(z);

                        p = z.next_in_index; n = z.avail_in; b = bitb; k = bitk;
                        q = write; m = (int) (q < read?read - q - 1:end - q);

                        if (last == 0)
                        {
                            mode = TYPE;
                            break;
                        }
                        mode = DRY;
                        goto case DRY;

                    case DRY:
                        write = q;
                        r = inflate_flush(z, r);
                        q = write; m = (int) (q < read?read - q - 1:end - q);
                        if (read != write)
                        {
                            bitb = b; bitk = k;
                            z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                            write = q;
                            return inflate_flush(z, r);
                        }
                        mode = DONE;
                        goto case DONE;

                    case DONE:
                        r = Z_STREAM_END;

                        bitb = b; bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        write = q;
                        return inflate_flush(z, r);

                    case BAD:
                        r = Z_DATA_ERROR;

                        bitb = b; bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        write = q;
                        return inflate_flush(z, r);

                    default:
                        r = Z_STREAM_ERROR;

                        bitb = b; bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        write = q;
                        return inflate_flush(z, r);

                }
            }
        }
Ejemplo n.º 7
0
        internal int deflateParams(ZStream strm, int _level, int _strategy)
        {
            int err = Z_OK;

            if (_level == Z_DEFAULT_COMPRESSION)
            {
                _level = 6;
            }
            if (_level < 0 || _level > 9 || _strategy < 0 || _strategy > Z_HUFFMAN_ONLY)
            {
                return Z_STREAM_ERROR;
            }

            if (config_table[level].func != config_table[_level].func && strm.total_in != 0)
            {
                // Flush the last buffer:
                err = strm.deflate(Z_PARTIAL_FLUSH);
            }

            if (level != _level)
            {
                level = _level;
                max_lazy_match = config_table[level].max_lazy;
                good_match = config_table[level].good_length;
                nice_match = config_table[level].nice_length;
                max_chain_length = config_table[level].max_chain;
            }
            strategy = _strategy;
            return err;
        }
Ejemplo n.º 8
0
 // Returns true if inflate is currently at the end of a block generated
 // by Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
 // implementation to provide an additional safety check. PPP uses Z_SYNC_FLUSH
 // but removes the length bytes of the resulting empty stored block. When
 // decompressing, PPP checks that at the end of input packet, inflate is
 // waiting for these length bytes.
 internal int inflateSyncPoint(ZStream z)
 {
     if (z == null || z.istate == null || z.istate.blocks == null)
         return Z_STREAM_ERROR;
     return z.istate.blocks.sync_point();
 }
Ejemplo n.º 9
0
 internal int deflateInit(ZStream strm, int level)
 {
     return deflateInit(strm, level, MAX_WBITS);
 }
Ejemplo n.º 10
0
        internal int deflateInit2(ZStream strm, int level, int method, int windowBits, int memLevel, int strategy)
        {
            int noheader = 0;
            //    byte[] my_version=ZLIB_VERSION;

            //
            //  if (version == null || version[0] != my_version[0]
            //  || stream_size != sizeof(z_stream)) {
            //  return Z_VERSION_ERROR;
            //  }

            strm.msg = null;

            if (level == Z_DEFAULT_COMPRESSION)
                level = 6;

            if (windowBits < 0)
            {
                // undocumented feature: suppress zlib header
                noheader = 1;
                windowBits = - windowBits;
            }

            if (memLevel < 1 || memLevel > MAX_MEM_LEVEL || method != Z_DEFLATED || windowBits < 9 || windowBits > 15 || level < 0 || level > 9 || strategy < 0 || strategy > Z_HUFFMAN_ONLY)
            {
                return Z_STREAM_ERROR;
            }

            strm.dstate = (Deflate) this;

            this.noheader = noheader;
            w_bits = windowBits;
            w_size = 1 << w_bits;
            w_mask = w_size - 1;

            hash_bits = memLevel + 7;
            hash_size = 1 << hash_bits;
            hash_mask = hash_size - 1;
            hash_shift = ((hash_bits + MIN_MATCH - 1) / MIN_MATCH);

            window = new byte[w_size * 2];
            prev = new short[w_size];
            head = new short[hash_size];

            lit_bufsize = 1 << (memLevel + 6); // 16K elements by default

            // We overlay pending_buf and d_buf+l_buf. This works since the average
            // output size for (length,distance) codes is <= 24 bits.
            pending_buf = new byte[lit_bufsize * 4];
            pending_buf_size = lit_bufsize * 4;

            d_buf = lit_bufsize;
            l_buf = (1 + 2) * lit_bufsize;

            this.level = level;

            //System.out.println("level="+level);

            this.strategy = strategy;
            this.method = (byte) method;

            return deflateReset(strm);
        }
Ejemplo n.º 11
0
 internal int deflateInit(ZStream strm, int level, int bits)
 {
     return deflateInit2(strm, level, Z_DEFLATED, bits, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
 }
Ejemplo n.º 12
0
        internal int deflate(ZStream strm, int flush)
        {
            int old_flush;

            if (flush > Z_FINISH || flush < 0)
            {
                return Z_STREAM_ERROR;
            }

            if (strm.next_out == null || (strm.next_in == null && strm.avail_in != 0) || (status == FINISH_STATE && flush != Z_FINISH))
            {
                strm.msg = z_errmsg[Z_NEED_DICT - (Z_STREAM_ERROR)];
                return Z_STREAM_ERROR;
            }
            if (strm.avail_out == 0)
            {
                strm.msg = z_errmsg[Z_NEED_DICT - (Z_BUF_ERROR)];
                return Z_BUF_ERROR;
            }

            this.strm = strm; // just in case
            old_flush = last_flush;
            last_flush = flush;

            // Write the zlib header
            if (status == INIT_STATE)
            {
                int header = (Z_DEFLATED + ((w_bits - 8) << 4)) << 8;
                int level_flags = ((level - 1) & 0xff) >> 1;

                if (level_flags > 3)
                    level_flags = 3;
                header |= (level_flags << 6);
                if (strstart != 0)
                    header |= PRESET_DICT;
                header += 31 - (header % 31);

                status = BUSY_STATE;
                putShortMSB(header);

                // Save the adler32 of the preset dictionary:
                if (strstart != 0)
                {
                    putShortMSB((int) (SupportClass.URShift(strm.adler, 16)));
                    putShortMSB((int) (strm.adler & 0xffff));
                }
                strm.adler = strm._adler.adler32(0, null, 0, 0);
            }

            // Flush as much pending output as possible
            if (pending != 0)
            {
                strm.flush_pending();
                if (strm.avail_out == 0)
                {
                    //System.out.println("  avail_out==0");
                    // Since avail_out is 0, deflate will be called again with
                    // more output space, but possibly with both pending and
                    // avail_in equal to zero. There won't be anything to do,
                    // but this is not an error situation so make sure we
                    // return OK instead of BUF_ERROR at next call of deflate:
                    last_flush = - 1;
                    return Z_OK;
                }

                // Make sure there is something to do and avoid duplicate consecutive
                // flushes. For repeated and useless calls with Z_FINISH, we keep
                // returning Z_STREAM_END instead of Z_BUFF_ERROR.
            }
            else if (strm.avail_in == 0 && flush <= old_flush && flush != Z_FINISH)
            {
                strm.msg = z_errmsg[Z_NEED_DICT - (Z_BUF_ERROR)];
                return Z_BUF_ERROR;
            }

            // User must not provide more input after the first FINISH:
            if (status == FINISH_STATE && strm.avail_in != 0)
            {
                strm.msg = z_errmsg[Z_NEED_DICT - (Z_BUF_ERROR)];
                return Z_BUF_ERROR;
            }

            // Start a new block or continue the current one.
            if (strm.avail_in != 0 || lookahead != 0 || (flush != Z_NO_FLUSH && status != FINISH_STATE))
            {
                int bstate = - 1;
                switch (config_table[level].func)
                {

                    case STORED:
                        bstate = deflate_stored(flush);
                        break;

                    case FAST:
                        bstate = deflate_fast(flush);
                        break;

                    case SLOW:
                        bstate = deflate_slow(flush);
                        break;

                    default:
                        break;

                }

                if (bstate == FinishStarted || bstate == FinishDone)
                {
                    status = FINISH_STATE;
                }
                if (bstate == NeedMore || bstate == FinishStarted)
                {
                    if (strm.avail_out == 0)
                    {
                        last_flush = - 1; // avoid BUF_ERROR next call, see above
                    }
                    return Z_OK;
                    // If flush != Z_NO_FLUSH && avail_out == 0, the next call
                    // of deflate should use the same flush parameter to make sure
                    // that the flush is complete. So we don't have to output an
                    // empty block here, this will be done at next call. This also
                    // ensures that for a very small output buffer, we emit at most
                    // one empty block.
                }

                if (bstate == BlockDone)
                {
                    if (flush == Z_PARTIAL_FLUSH)
                    {
                        _tr_align();
                    }
                    else
                    {
                        // FULL_FLUSH or SYNC_FLUSH
                        _tr_stored_block(0, 0, false);
                        // For a full flush, this empty block will be recognized
                        // as a special marker by inflate_sync().
                        if (flush == Z_FULL_FLUSH)
                        {
                            //state.head[s.hash_size-1]=0;
                            for (int i = 0; i < hash_size; i++)
                            // forget history
                                head[i] = 0;
                        }
                    }
                    strm.flush_pending();
                    if (strm.avail_out == 0)
                    {
                        last_flush = - 1; // avoid BUF_ERROR at next call, see above
                        return Z_OK;
                    }
                }
            }

            if (flush != Z_FINISH)
                return Z_OK;
            if (noheader != 0)
                return Z_STREAM_END;

            // Write the zlib trailer (adler32)
            putShortMSB((int) (SupportClass.URShift(strm.adler, 16)));
            putShortMSB((int) (strm.adler & 0xffff));
            strm.flush_pending();

            // If avail_out is zero, the application will call deflate again
            // to flush the rest.
            noheader = - 1; // write the trailer only once!
            return pending != 0?Z_OK:Z_STREAM_END;
        }
Ejemplo n.º 13
0
 internal static int inflate_trees_fixed(int[] bl, int[] bd, int[][] tl, int[][] td, ZStream z)
 {
     bl[0] = fixed_bl;
     bd[0] = fixed_bd;
     tl[0] = fixed_tl;
     td[0] = fixed_td;
     return Z_OK;
 }
Ejemplo n.º 14
0
        internal int inflateSetDictionary(ZStream z, byte[] dictionary, int dictLength)
        {
            int index = 0;
            int length = dictLength;
            if (z == null || z.istate == null || z.istate.mode != DICT0)
                return Z_STREAM_ERROR;

            if (z._adler.adler32(1L, dictionary, 0, dictLength) != z.adler)
            {
                return Z_DATA_ERROR;
            }

            z.adler = z._adler.adler32(0, null, 0, 0);

            if (length >= (1 << z.istate.wbits))
            {
                length = (1 << z.istate.wbits) - 1;
                index = dictLength - length;
            }
            z.istate.blocks.set_dictionary(dictionary, index, length);
            z.istate.mode = BLOCKS;
            return Z_OK;
        }
Ejemplo n.º 15
0
        internal int deflateReset(ZStream strm)
        {
            strm.total_in = strm.total_out = 0;
            strm.msg = null; //
            strm.data_type = Z_UNKNOWN;

            pending = 0;
            pending_out = 0;

            if (noheader < 0)
            {
                noheader = 0; // was set to -1 by deflate(..., Z_FINISH);
            }
            status = (noheader != 0)?BUSY_STATE:INIT_STATE;
            strm.adler = strm._adler.adler32(0, null, 0, 0);

            last_flush = Z_NO_FLUSH;

            tr_init();
            lm_init();
            return Z_OK;
        }
Ejemplo n.º 16
0
        internal int inflateSync(ZStream z)
        {
            int n; // number of bytes to look at
            int p; // pointer to bytes
            int m; // number of marker bytes found in a row
            long r, w; // temporaries to save total_in and total_out

            // set up
            if (z == null || z.istate == null)
                return Z_STREAM_ERROR;
            if (z.istate.mode != BAD)
            {
                z.istate.mode = BAD;
                z.istate.marker = 0;
            }
            if ((n = z.avail_in) == 0)
                return Z_BUF_ERROR;
            p = z.next_in_index;
            m = z.istate.marker;

            // search
            while (n != 0 && m < 4)
            {
                if (z.next_in[p] == mark[m])
                {
                    m++;
                }
                else if (z.next_in[p] != 0)
                {
                    m = 0;
                }
                else
                {
                    m = 4 - m;
                }
                p++; n--;
            }

            // restore
            z.total_in += p - z.next_in_index;
            z.next_in_index = p;
            z.avail_in = n;
            z.istate.marker = m;

            // return no joy or set up to restart on a new block
            if (m != 4)
            {
                return Z_DATA_ERROR;
            }
            r = z.total_in; w = z.total_out;
            inflateReset(z);
            z.total_in = r; z.total_out = w;
            z.istate.mode = BLOCKS;
            return Z_OK;
        }
Ejemplo n.º 17
0
        internal int deflateSetDictionary(ZStream strm, byte[] dictionary, int dictLength)
        {
            int length = dictLength;
            int index = 0;

            if (dictionary == null || status != INIT_STATE)
                return Z_STREAM_ERROR;

            strm.adler = strm._adler.adler32(strm.adler, dictionary, 0, dictLength);

            if (length < MIN_MATCH)
                return Z_OK;
            if (length > w_size - MIN_LOOKAHEAD)
            {
                length = w_size - MIN_LOOKAHEAD;
                index = dictLength - length; // use the tail of the dictionary
            }
            Array.Copy(dictionary, index, window, 0, length);
            strstart = length;
            block_start = length;

            // Insert all strings in the hash table (except for the last two bytes).
            // s->lookahead stays null, so s->ins_h will be recomputed at the next
            // call of fill_window.

            ins_h = window[0] & 0xff;
            ins_h = (((ins_h) << hash_shift) ^ (window[1] & 0xff)) & hash_mask;

            for (int n = 0; n <= length - MIN_MATCH; n++)
            {
                ins_h = (((ins_h) << hash_shift) ^ (window[(n) + (MIN_MATCH - 1)] & 0xff)) & hash_mask;
                prev[n & w_mask] = head[ins_h];
                head[ins_h] = (short) n;
            }
            return Z_OK;
        }
Ejemplo n.º 18
0
 internal InfBlocks(ZStream z, System.Object checkfn, int w)
 {
     hufts = new int[MANY * 3];
     window = new byte[w];
     end = w;
     this.checkfn = checkfn;
     mode = TYPE;
     reset(z, null);
 }
Ejemplo n.º 19
0
 public virtual void end()
 {
     if (compress)
     {
         z.deflateEnd();
     }
     else
     {
         z.inflateEnd();
     }
     z.free();
     z = null;
 }
Ejemplo n.º 20
0
        // copy as much as possible from the sliding window to the output area
        internal int inflate_flush(ZStream z, int r)
        {
            int n;
            int p;
            int q;

            // local copies of source and destination pointers
            p = z.next_out_index;
            q = read;

            // compute number of bytes to copy as far as end of window
            n = (int) ((q <= write?write:end) - q);
            if (n > z.avail_out)
                n = z.avail_out;
            if (n != 0 && r == Z_BUF_ERROR)
                r = Z_OK;

            // update counters
            z.avail_out -= n;
            z.total_out += n;

            // update check information
            if (checkfn != null)
                z.adler = check = z._adler.adler32(check, window, q, n);

            // copy as far as end of window
            Array.Copy(window, q, z.next_out, p, n);
            p += n;
            q += n;

            // see if more to copy at beginning of window
            if (q == end)
            {
                // wrap pointers
                q = 0;
                if (write == end)
                    write = 0;

                // compute bytes to copy
                n = write - q;
                if (n > z.avail_out)
                    n = z.avail_out;
                if (n != 0 && r == Z_BUF_ERROR)
                    r = Z_OK;

                // update counters
                z.avail_out -= n;
                z.total_out += n;

                // update check information
                if (checkfn != null)
                    z.adler = check = z._adler.adler32(check, window, q, n);

                // copy
                Array.Copy(window, q, z.next_out, p, n);
                p += n;
                q += n;
            }

            // update pointers
            z.next_out_index = p;
            read = q;

            // done
            return r;
        }
Ejemplo n.º 21
0
        internal int inflate(ZStream z, int f)
        {
            int r;
            int b;

            if (z == null || z.istate == null || z.next_in == null)
                return Z_STREAM_ERROR;
            f = f == Z_FINISH?Z_BUF_ERROR:Z_OK;
            r = Z_BUF_ERROR;
            while (true)
            {
                //System.out.println("mode: "+z.istate.mode);
                switch (z.istate.mode)
                {

                    case METHOD:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        if (((z.istate.method = z.next_in[z.next_in_index++]) & 0xf) != Z_DEFLATED)
                        {
                            z.istate.mode = BAD;
                            z.msg = "unknown compression method";
                            z.istate.marker = 5; // can't try inflateSync
                            break;
                        }
                        if ((z.istate.method >> 4) + 8 > z.istate.wbits)
                        {
                            z.istate.mode = BAD;
                            z.msg = "invalid window size";
                            z.istate.marker = 5; // can't try inflateSync
                            break;
                        }
                        z.istate.mode = FLAG;
                        goto case FLAG;

                    case FLAG:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        b = (z.next_in[z.next_in_index++]) & 0xff;

                        if ((((z.istate.method << 8) + b) % 31) != 0)
                        {
                            z.istate.mode = BAD;
                            z.msg = "incorrect header check";
                            z.istate.marker = 5; // can't try inflateSync
                            break;
                        }

                        if ((b & PRESET_DICT) == 0)
                        {
                            z.istate.mode = BLOCKS;
                            break;
                        }
                        z.istate.mode = DICT4;
                        goto case DICT4;

                    case DICT4:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        z.istate.need = ((z.next_in[z.next_in_index++] & 0xff) << 24) & unchecked((int) 0xff000000L);
                        z.istate.mode = DICT3;
                        goto case DICT3;

                    case DICT3:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 16) & 0xff0000L);
                        z.istate.mode = DICT2;
                        goto case DICT2;

                    case DICT2:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 8) & 0xff00L);
                        z.istate.mode = DICT1;
                        goto case DICT1;

                    case DICT1:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        z.istate.need += (z.next_in[z.next_in_index++] & 0xffL);
                        z.adler = z.istate.need;
                        z.istate.mode = DICT0;
                        return Z_NEED_DICT;

                    case DICT0:
                        z.istate.mode = BAD;
                        z.msg = "need dictionary";
                        z.istate.marker = 0; // can try inflateSync
                        return Z_STREAM_ERROR;

                    case BLOCKS:

                        r = z.istate.blocks.proc(z, r);
                        if (r == Z_DATA_ERROR)
                        {
                            z.istate.mode = BAD;
                            z.istate.marker = 0; // can try inflateSync
                            break;
                        }
                        if (r == Z_OK)
                        {
                            r = f;
                        }
                        if (r != Z_STREAM_END)
                        {
                            return r;
                        }
                        r = f;
                        z.istate.blocks.reset(z, z.istate.was);
                        if (z.istate.nowrap != 0)
                        {
                            z.istate.mode = DONE;
                            break;
                        }
                        z.istate.mode = CHECK4;
                        goto case CHECK4;

                    case CHECK4:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        z.istate.need = ((z.next_in[z.next_in_index++] & 0xff) << 24) & unchecked((int) 0xff000000L);
                        z.istate.mode = CHECK3;
                        goto case CHECK3;

                    case CHECK3:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 16) & 0xff0000L);
                        z.istate.mode = CHECK2;
                        goto case CHECK2;

                    case CHECK2:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        z.istate.need += (((z.next_in[z.next_in_index++] & 0xff) << 8) & 0xff00L);
                        z.istate.mode = CHECK1;
                        goto case CHECK1;

                    case CHECK1:

                        if (z.avail_in == 0)
                            return r; r = f;

                        z.avail_in--; z.total_in++;
                        z.istate.need += (z.next_in[z.next_in_index++] & 0xffL);

                        if (((int) (z.istate.was[0])) != ((int) (z.istate.need)))
                        {
                            z.istate.mode = BAD;
                            z.msg = "incorrect data check";
                            z.istate.marker = 5; // can't try inflateSync
                            break;
                        }

                        z.istate.mode = DONE;
                        goto case DONE;

                    case DONE:
                        return Z_STREAM_END;

                    case BAD:
                        return Z_DATA_ERROR;

                    default:
                        return Z_STREAM_ERROR;

                }
            }
        }
Ejemplo n.º 22
0
        internal void reset(ZStream z, long[] c)
        {
            if (c != null)
                c[0] = check;
            if (mode == BTREE || mode == DTREE)
            {
                blens = null;
            }
            if (mode == CODES)
            {
                codes.free(z);
            }
            mode = TYPE;
            bitk = 0;
            bitb = 0;
            read = write = 0;

            if (checkfn != null)
                z.adler = check = z._adler.adler32(0L, null, 0, 0);
        }
Ejemplo n.º 23
0
 internal int inflateEnd(ZStream z)
 {
     if (blocks != null)
         blocks.free(z);
     blocks = null;
     //    ZFREE(z, z->state);
     return Z_OK;
 }
Ejemplo n.º 24
0
 internal void free(ZStream z)
 {
     //  ZFREE(z, c);
 }
Ejemplo n.º 25
0
        internal int inflateInit(ZStream z, int w)
        {
            z.msg = null;
            blocks = null;

            // handle undocumented nowrap option (no zlib header or check)
            nowrap = 0;
            if (w < 0)
            {
                w = - w;
                nowrap = 1;
            }

            // set window size
            if (w < 8 || w > 15)
            {
                inflateEnd(z);
                return Z_STREAM_ERROR;
            }
            wbits = w;

            z.istate.blocks = new InfBlocks(z, z.istate.nowrap != 0?null:this, 1 << w);

            // reset state
            inflateReset(z);
            return Z_OK;
        }
Ejemplo n.º 26
0
        internal int proc(InfBlocks s, ZStream z, int r)
        {
            int j; // temporary storage
             //int[] t; // temporary pointer
            int tindex; // temporary pointer
            int e; // extra bits or operation
            int b = 0; // bit buffer
            int k = 0; // bits in bit buffer
            int p = 0; // input data pointer
            int n; // bytes available there
            int q; // output window write pointer
            int m; // bytes to end of window or read pointer
            int f; // pointer to copy strings from

            // copy input/output information to locals (UPDATE macro restores)
            p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk;
            q = s.write; m = q < s.read?s.read - q - 1:s.end - q;

            // process input and output based on current state
            while (true)
            {
                switch (mode)
                {

                    // waiting for "i:"=input, "o:"=output, "x:"=nothing
                    case START:  // x: set up for LEN
                        if (m >= 258 && n >= 10)
                        {

                            s.bitb = b; s.bitk = k;
                            z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                            s.write = q;
                            r = inflate_fast(lbits, dbits, ltree, ltree_index, dtree, dtree_index, s, z);

                            p = z.next_in_index; n = z.avail_in; b = s.bitb; k = s.bitk;
                            q = s.write; m = q < s.read?s.read - q - 1:s.end - q;

                            if (r != Z_OK)
                            {
                                mode = r == Z_STREAM_END?WASH:BADCODE;
                                break;
                            }
                        }
                        need = lbits;
                        tree = ltree;
                        tree_index = ltree_index;

                        mode = LEN;
                        goto case LEN;

                    case LEN:  // i: get length/literal/eob next
                        j = need;

                        while (k < (j))
                        {
                            if (n != 0)
                                r = Z_OK;
                            else
                            {

                                s.bitb = b; s.bitk = k;
                                z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                s.write = q;
                                return s.inflate_flush(z, r);
                            }
                            n--;
                            b |= (z.next_in[p++] & 0xff) << k;
                            k += 8;
                        }

                        tindex = (tree_index + (b & inflate_mask[j])) * 3;

                        b = SupportClass.URShift(b, (tree[tindex + 1]));
                        k -= (tree[tindex + 1]);

                        e = tree[tindex];

                        if (e == 0)
                        {
                            // literal
                            lit = tree[tindex + 2];
                            mode = LIT;
                            break;
                        }
                        if ((e & 16) != 0)
                        {
                            // length
                            get_Renamed = e & 15;
                            len = tree[tindex + 2];
                            mode = LENEXT;
                            break;
                        }
                        if ((e & 64) == 0)
                        {
                            // next table
                            need = e;
                            tree_index = tindex / 3 + tree[tindex + 2];
                            break;
                        }
                        if ((e & 32) != 0)
                        {
                            // end of block
                            mode = WASH;
                            break;
                        }
                        mode = BADCODE; // invalid code
                        z.msg = "invalid literal/length code";
                        r = Z_DATA_ERROR;

                        s.bitb = b; s.bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        s.write = q;
                        return s.inflate_flush(z, r);

                    case LENEXT:  // i: getting length extra (have base)
                        j = get_Renamed;

                        while (k < (j))
                        {
                            if (n != 0)
                                r = Z_OK;
                            else
                            {

                                s.bitb = b; s.bitk = k;
                                z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                s.write = q;
                                return s.inflate_flush(z, r);
                            }
                            n--; b |= (z.next_in[p++] & 0xff) << k;
                            k += 8;
                        }

                        len += (b & inflate_mask[j]);

                        b >>= j;
                        k -= j;

                        need = dbits;
                        tree = dtree;
                        tree_index = dtree_index;
                        mode = DIST;
                        goto case DIST;

                    case DIST:  // i: get distance next
                        j = need;

                        while (k < (j))
                        {
                            if (n != 0)
                                r = Z_OK;
                            else
                            {

                                s.bitb = b; s.bitk = k;
                                z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                s.write = q;
                                return s.inflate_flush(z, r);
                            }
                            n--; b |= (z.next_in[p++] & 0xff) << k;
                            k += 8;
                        }

                        tindex = (tree_index + (b & inflate_mask[j])) * 3;

                        b >>= tree[tindex + 1];
                        k -= tree[tindex + 1];

                        e = (tree[tindex]);
                        if ((e & 16) != 0)
                        {
                            // distance
                            get_Renamed = e & 15;
                            dist = tree[tindex + 2];
                            mode = DISTEXT;
                            break;
                        }
                        if ((e & 64) == 0)
                        {
                            // next table
                            need = e;
                            tree_index = tindex / 3 + tree[tindex + 2];
                            break;
                        }
                        mode = BADCODE; // invalid code
                        z.msg = "invalid distance code";
                        r = Z_DATA_ERROR;

                        s.bitb = b; s.bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        s.write = q;
                        return s.inflate_flush(z, r);

                    case DISTEXT:  // i: getting distance extra
                        j = get_Renamed;

                        while (k < (j))
                        {
                            if (n != 0)
                                r = Z_OK;
                            else
                            {

                                s.bitb = b; s.bitk = k;
                                z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                s.write = q;
                                return s.inflate_flush(z, r);
                            }
                            n--; b |= (z.next_in[p++] & 0xff) << k;
                            k += 8;
                        }

                        dist += (b & inflate_mask[j]);

                        b >>= j;
                        k -= j;

                        mode = COPY;
                        goto case COPY;

                    case COPY:  // o: copying bytes in window, waiting for space
                        f = q - dist;
                        while (f < 0)
                        {
                            // modulo window size-"while" instead
                            f += s.end; // of "if" handles invalid distances
                        }
                        while (len != 0)
                        {

                            if (m == 0)
                            {
                                if (q == s.end && s.read != 0)
                                {
                                    q = 0; m = q < s.read?s.read - q - 1:s.end - q;
                                }
                                if (m == 0)
                                {
                                    s.write = q; r = s.inflate_flush(z, r);
                                    q = s.write; m = q < s.read?s.read - q - 1:s.end - q;

                                    if (q == s.end && s.read != 0)
                                    {
                                        q = 0; m = q < s.read?s.read - q - 1:s.end - q;
                                    }

                                    if (m == 0)
                                    {
                                        s.bitb = b; s.bitk = k;
                                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                        s.write = q;
                                        return s.inflate_flush(z, r);
                                    }
                                }
                            }

                            s.window[q++] = s.window[f++]; m--;

                            if (f == s.end)
                                f = 0;
                            len--;
                        }
                        mode = START;
                        break;

                    case LIT:  // o: got literal, waiting for output space
                        if (m == 0)
                        {
                            if (q == s.end && s.read != 0)
                            {
                                q = 0; m = q < s.read?s.read - q - 1:s.end - q;
                            }
                            if (m == 0)
                            {
                                s.write = q; r = s.inflate_flush(z, r);
                                q = s.write; m = q < s.read?s.read - q - 1:s.end - q;

                                if (q == s.end && s.read != 0)
                                {
                                    q = 0; m = q < s.read?s.read - q - 1:s.end - q;
                                }
                                if (m == 0)
                                {
                                    s.bitb = b; s.bitk = k;
                                    z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                                    s.write = q;
                                    return s.inflate_flush(z, r);
                                }
                            }
                        }
                        r = Z_OK;

                        s.window[q++] = (byte) lit; m--;

                        mode = START;
                        break;

                    case WASH:  // o: got eob, possibly more output
                        if (k > 7)
                        {
                            // return unused byte, if any
                            k -= 8;
                            n++;
                            p--; // can always return one
                        }

                        s.write = q; r = s.inflate_flush(z, r);
                        q = s.write; m = q < s.read?s.read - q - 1:s.end - q;

                        if (s.read != s.write)
                        {
                            s.bitb = b; s.bitk = k;
                            z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                            s.write = q;
                            return s.inflate_flush(z, r);
                        }
                        mode = END;
                        goto case END;

                    case END:
                        r = Z_STREAM_END;
                        s.bitb = b; s.bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        s.write = q;
                        return s.inflate_flush(z, r);

                    case BADCODE:  // x: got error

                        r = Z_DATA_ERROR;

                        s.bitb = b; s.bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        s.write = q;
                        return s.inflate_flush(z, r);

                    default:
                        r = Z_STREAM_ERROR;

                        s.bitb = b; s.bitk = k;
                        z.avail_in = n; z.total_in += p - z.next_in_index; z.next_in_index = p;
                        s.write = q;
                        return s.inflate_flush(z, r);

                }
            }
        }
Ejemplo n.º 27
0
        internal static int inflate_trees_bits(int[] c, int[] bb, int[] tb, int[] hp, ZStream z)
        {
            int r;
            int[] hn = new int[1]; // hufts used in space
            int[] v = new int[19]; // work area for huft_build

            r = huft_build(c, 0, 19, 19, null, null, tb, bb, hp, hn, v);

            if (r == Z_DATA_ERROR)
            {
                z.msg = "oversubscribed dynamic bit lengths tree";
            }
            else if (r == Z_BUF_ERROR || bb[0] == 0)
            {
                z.msg = "incomplete dynamic bit lengths tree";
                r = Z_DATA_ERROR;
            }
            return r;
        }