Encoder and Decoder for ZLIB (IETF RFC1950 and RFC1951).
This class compresses and decompresses data according to the Deflate algorithm documented in RFC1950 and RFC1951.
Exemplo n.º 1
0
        internal int inflate_trees_bits(int[] c, int[] bb, int[] tb, int[] hp, ZlibCodec z)
        {
            int result;
            initWorkArea(19);
            hn[0] = 0;
            result = huft_build(c, 0, 19, 19, null, null, tb, bb, hp, hn, v);

            if (result == Z_DATA_ERROR)
            {
                z.Message = "oversubscribed dynamic bit lengths tree";
            }
            else if (result == Z_BUF_ERROR || bb[0] == 0)
            {
                z.Message = "incomplete dynamic bit lengths tree";
                result = Z_DATA_ERROR;
            }
            return result;
        }
Exemplo n.º 2
0
 internal int End(ZlibCodec z)
 {
     if (blocks != null)
         blocks.Free (z);
     blocks = null;
     //    ZFREE(z, z->state);
     return ZlibConstants.Z_OK;
 }
Exemplo n.º 3
0
        internal int Process(ZlibCodec 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.NextIn;
                n = z.AvailableBytesIn;
                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 = ZlibConstants.Z_OK;
                        } else {
                            bitb = b;
                            bitk = k;
                            z.AvailableBytesIn = n;
                            z.TotalBytesIn += p - z.NextIn;
                            z.NextIn = p;
                            write = q;
                            return Flush (z, r);
                        }
                        ;
                        n--;
                        b |= (z.InputBuffer [p++] & 0xff) << k;
                        k += 8;
                    }
                    t = (int)(b & 7);
                    last = t & 1;

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

                    case 0:  // stored
                        {
                            b = SharedUtils.URShift (b, (3));
                            k -= (3);
                        }
                        t = k & 7; // go to byte boundary
                        {
                            b = SharedUtils.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.Init (bl [0], bd [0], tl [0], 0, td [0], 0, z);
                        }
                        {
                            b = SharedUtils.URShift (b, (3));
                            k -= (3);
                        }

                        mode = CODES;
                        break;

                    case 2:  // dynamic
                        {
                            b = SharedUtils.URShift (b, (3));
                            k -= (3);
                        }

                        mode = TABLE;
                        break;

                    case 3:  // illegal
                        {
                            b = SharedUtils.URShift (b, (3));
                            k -= (3);
                        }
                        mode = BAD;
                        z.Message = "invalid block type";
                        r = ZlibConstants.Z_DATA_ERROR;

                        bitb = b;
                        bitk = k;
                        z.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        write = q;
                        return Flush (z, r);
                    }
                    break;

                case LENS:

                    while (k < (32)) {
                        if (n != 0) {
                            r = ZlibConstants.Z_OK;
                        } else {
                            bitb = b;
                            bitk = k;
                            z.AvailableBytesIn = n;
                            z.TotalBytesIn += p - z.NextIn;
                            z.NextIn = p;
                            write = q;
                            return Flush (z, r);
                        }
                        ;
                        n--;
                        b |= (z.InputBuffer [p++] & 0xff) << k;
                        k += 8;
                    }

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

                        bitb = b;
                        bitk = k;
                        z.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        write = q;
                        return 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.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        write = q;
                        return 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 = 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.AvailableBytesIn = n;
                                z.TotalBytesIn += p - z.NextIn;
                                z.NextIn = p;
                                write = q;
                                return Flush (z, r);
                            }
                        }
                    }
                    r = ZlibConstants.Z_OK;

                    t = left;
                    if (t > n)
                        t = n;
                    if (t > m)
                        t = m;
                    Array.Copy (z.InputBuffer, 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 = ZlibConstants.Z_OK;
                        } else {
                            bitb = b;
                            bitk = k;
                            z.AvailableBytesIn = n;
                            z.TotalBytesIn += p - z.NextIn;
                            z.NextIn = p;
                            write = q;
                            return Flush (z, r);
                        }
                        ;
                        n--;
                        b |= (z.InputBuffer [p++] & 0xff) << k;
                        k += 8;
                    }

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

                        bitb = b;
                        bitk = k;
                        z.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        write = q;
                        return Flush (z, r);
                    }
                    t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
                    if (blens == null || blens.Length < t) {
                        blens = new int[t];
                    } else {
                        for (int i = 0; i < t; i++) {
                            blens [i] = 0;
                        }
                    }
                    {
                        b = SharedUtils.URShift (b, (14));
                        k -= (14);
                    }

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

                case BTREE:
                    while (index < 4 + (SharedUtils.URShift(table, 10))) {
                        while (k < (3)) {
                            if (n != 0) {
                                r = ZlibConstants.Z_OK;
                            } else {
                                bitb = b;
                                bitk = k;
                                z.AvailableBytesIn = n;
                                z.TotalBytesIn += p - z.NextIn;
                                z.NextIn = p;
                                write = q;
                                return Flush (z, r);
                            }
                            ;
                            n--;
                            b |= (z.InputBuffer [p++] & 0xff) << k;
                            k += 8;
                        }

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

                        {
                            b = SharedUtils.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 != ZlibConstants.Z_OK) {
                        r = t;
                        if (r == ZlibConstants.Z_DATA_ERROR) {
                            blens = null;
                            mode = BAD;
                        }

                        bitb = b;
                        bitk = k;
                        z.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        write = q;
                        return 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 = ZlibConstants.Z_OK;
                            } else {
                                bitb = b;
                                bitk = k;
                                z.AvailableBytesIn = n;
                                z.TotalBytesIn += p - z.NextIn;
                                z.NextIn = p;
                                write = q;
                                return Flush (z, r);
                            }
                            ;
                            n--;
                            b |= (z.InputBuffer [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 = SharedUtils.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 = ZlibConstants.Z_OK;
                                } else {
                                    bitb = b;
                                    bitk = k;
                                    z.AvailableBytesIn = n;
                                    z.TotalBytesIn += p - z.NextIn;
                                    z.NextIn = p;
                                    write = q;
                                    return Flush (z, r);
                                }
                                ;
                                n--;
                                b |= (z.InputBuffer [p++] & 0xff) << k;
                                k += 8;
                            }

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

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

                            b = SharedUtils.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.Message = "invalid bit length repeat";
                                r = ZlibConstants.Z_DATA_ERROR;

                                bitb = b;
                                bitk = k;
                                z.AvailableBytesIn = n;
                                z.TotalBytesIn += p - z.NextIn;
                                z.NextIn = p;
                                write = q;
                                return 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[] { 9 };  // must be <= 9 for lookahead assumptions
                        int[] bd = new int[] { 6 }; // must be <= 9 for lookahead assumptions
                        int[] tl = new int[1];
                        int[] td = new int[1];

                        t = table;
                        t = inftree.inflate_trees_dynamic (257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f), blens, bl, bd, tl, td, hufts, z);

                        if (t != ZlibConstants.Z_OK) {
                            if (t == ZlibConstants.Z_DATA_ERROR) {
                                blens = null;
                                mode = BAD;
                            }
                            r = t;

                            bitb = b;
                            bitk = k;
                            z.AvailableBytesIn = n;
                            z.TotalBytesIn += p - z.NextIn;
                            z.NextIn = p;
                            write = q;
                            return Flush (z, r);
                        }
                        codes.Init (bl [0], bd [0], hufts, tl [0], hufts, td [0], z);
                    }
                    mode = CODES;
                    goto case CODES;

                case CODES:
                    bitb = b;
                    bitk = k;
                    z.AvailableBytesIn = n;
                    z.TotalBytesIn += p - z.NextIn;
                    z.NextIn = p;
                    write = q;

                    if ((r = codes.Process (this, z, r)) != ZlibConstants.Z_STREAM_END) {
                        return Flush (z, r);
                    }
                    r = ZlibConstants.Z_OK;
                    p = z.NextIn;
                    n = z.AvailableBytesIn;
                    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 = Flush (z, r);
                    q = write;
                    m = (int)(q < read ? read - q - 1 : end - q);
                    if (read != write) {
                        bitb = b;
                        bitk = k;
                        z.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        write = q;
                        return Flush (z, r);
                    }
                    mode = DONE;
                    goto case DONE;

                case DONE:
                    r = ZlibConstants.Z_STREAM_END;

                    bitb = b;
                    bitk = k;
                    z.AvailableBytesIn = n;
                    z.TotalBytesIn += p - z.NextIn;
                    z.NextIn = p;
                    write = q;
                    return Flush (z, r);

                case BAD:
                    r = ZlibConstants.Z_DATA_ERROR;

                    bitb = b;
                    bitk = k;
                    z.AvailableBytesIn = n;
                    z.TotalBytesIn += p - z.NextIn;
                    z.NextIn = p;
                    write = q;
                    return Flush (z, r);

                default:
                    r = ZlibConstants.Z_STREAM_ERROR;

                    bitb = b;
                    bitk = k;
                    z.AvailableBytesIn = n;
                    z.TotalBytesIn += p - z.NextIn;
                    z.NextIn = p;
                    write = q;
                    return Flush (z, r);

                }
            }
        }
Exemplo n.º 4
0
        internal int Deflate(ZlibCodec strm, int flush)
        {
            int old_flush;

            if (flush > ZlibConstants.Z_FINISH || flush < 0) {
                throw new ZlibException (String.Format ("Flush value is invalid. Should be 0 < x < {0}", ZlibConstants.Z_FINISH));
                //return ZlibConstants.Z_STREAM_ERROR;
            }

            if (strm.OutputBuffer == null || (strm.InputBuffer == null && strm.AvailableBytesIn != 0) || (status == FINISH_STATE && flush != ZlibConstants.Z_FINISH)) {
                strm.Message = z_errmsg [ZlibConstants.Z_NEED_DICT - (ZlibConstants.Z_STREAM_ERROR)];
                throw new ZlibException (String.Format ("Something is fishy. [{0}]", strm.Message));
                //return ZlibConstants.Z_STREAM_ERROR;
            }
            if (strm.AvailableBytesOut == 0) {
                strm.Message = z_errmsg [ZlibConstants.Z_NEED_DICT - (ZlibConstants.Z_BUF_ERROR)];
                throw new ZlibException ("OutputBuffer is full (AvailableBytesOut == 0)");
                //return ZlibConstants.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 = (((int)compressionLevel - 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)(SharedUtils.URShift (strm._Adler32, 16)));
                    putShortMSB ((int)(strm._Adler32 & 0xffff));
                }
                strm._Adler32 = Adler.Adler32 (0, null, 0, 0);
            }

            // Flush as much pending output as possible
            if (pendingCount != 0) {
                strm.flush_pending ();
                if (strm.AvailableBytesOut == 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 ZlibConstants.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.AvailableBytesIn == 0 && flush <= old_flush && flush != ZlibConstants.Z_FINISH) {
                strm.Message = z_errmsg [ZlibConstants.Z_NEED_DICT - (ZlibConstants.Z_BUF_ERROR)];
                throw new ZlibException ("AvailableBytesOut == 0 && flush<=old_flush && flush != ZlibConstants.Z_FINISH");
                //return ZlibConstants.Z_BUF_ERROR;
            }

            // User must not provide more input after the first FINISH:
            if (status == FINISH_STATE && strm.AvailableBytesIn != 0) {
                strm.Message = z_errmsg [ZlibConstants.Z_NEED_DICT - (ZlibConstants.Z_BUF_ERROR)];
                throw new ZlibException ("status == FINISH_STATE && strm.AvailableBytesIn != 0");
                //return ZlibConstants.Z_BUF_ERROR;
            }

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

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

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

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

                default:
                    break;

                }

                if (bstate == FinishStarted || bstate == FinishDone) {
                    status = FINISH_STATE;
                }
                if (bstate == NeedMore || bstate == FinishStarted) {
                    if (strm.AvailableBytesOut == 0) {
                        last_flush = - 1; // avoid BUF_ERROR next call, see above
                    }
                    return ZlibConstants.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 == ZlibConstants.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 == ZlibConstants.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.AvailableBytesOut == 0) {
                        last_flush = - 1; // avoid BUF_ERROR at next call, see above
                        return ZlibConstants.Z_OK;
                    }
                }
            }

            if (flush != ZlibConstants.Z_FINISH)
                return ZlibConstants.Z_OK;

            if (!WantRfc1950HeaderBytes || Rfc1950BytesEmitted)
                return ZlibConstants.Z_STREAM_END;

            // Write the zlib trailer (adler32)
            putShortMSB ((int)(SharedUtils.URShift (strm._Adler32, 16)));
            putShortMSB ((int)(strm._Adler32 & 0xffff));
            strm.flush_pending ();

            // If avail_out is zero, the application will call deflate again
            // to flush the rest.

            Rfc1950BytesEmitted = true; // write the trailer only once!

            return pendingCount != 0 ? ZlibConstants.Z_OK : ZlibConstants.Z_STREAM_END;
        }
Exemplo n.º 5
0
 internal int Initialize(ZlibCodec strm, CompressionLevel level)
 {
     return Initialize (strm, level, ZlibConstants.WINDOW_BITS_MAX);
 }
Exemplo n.º 6
0
 private void end()
 {
     if (_z == null)
         return;
     if (_wantCompress)
     {
         _z.EndDeflate();
     }
     else
     {
         _z.EndInflate();
     }
     _z = null;
 }
Exemplo n.º 7
0
        internal int SetDictionary(ZlibCodec strm, byte[] dictionary)
        {
            int length = dictionary.Length;
            int index = 0;

            if (dictionary == null || status != INIT_STATE)
                throw new ZlibException ("Stream error.");

            strm._Adler32 = Adler.Adler32 (strm._Adler32, dictionary, 0, dictionary.Length);

            if (length < MIN_MATCH)
                return ZlibConstants.Z_OK;
            if (length > w_size - MIN_LOOKAHEAD) {
                length = w_size - MIN_LOOKAHEAD;
                index = dictionary.Length - 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 ZlibConstants.Z_OK;
        }
Exemplo n.º 8
0
        internal int Reset(ZlibCodec z)
        {
            if (z == null)
                throw new ZlibException ("Codec is null.");

            if (z.istate == null)
                throw new ZlibException ("InflateManager is null.");

            z.TotalBytesIn = z.TotalBytesOut = 0;
            z.Message = null;
            z.istate.mode = z.istate.HandleRfc1950HeaderBytes ? METHOD : BLOCKS;
            z.istate.blocks.Reset (z, null);
            return ZlibConstants.Z_OK;
        }
Exemplo n.º 9
0
        internal int SetDictionary(ZlibCodec z, byte[] dictionary)
        {
            int index = 0;
            int length = dictionary.Length;
            if (z == null || z.istate == null || z.istate.mode != DICT0)
                throw new ZlibException ("Stream error.");

            if (Adler.Adler32 (1L, dictionary, 0, dictionary.Length) != z._Adler32) {
                return ZlibConstants.Z_DATA_ERROR;
            }

            z._Adler32 = Adler.Adler32 (0, null, 0, 0);

            if (length >= (1 << z.istate.wbits)) {
                length = (1 << z.istate.wbits) - 1;
                index = dictionary.Length - length;
            }
            z.istate.blocks.SetDictionary (dictionary, index, length);
            z.istate.mode = BLOCKS;
            return ZlibConstants.Z_OK;
        }
Exemplo n.º 10
0
        internal int Process(InflateBlocks blocks, ZlibCodec z, int r)
        {
            int j; // temporary storage
            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.NextIn;
            n = z.AvailableBytesIn;
            b = blocks.bitb;
            k = blocks.bitk;
            q = blocks.write;
            m = q < blocks.read ? blocks.read - q - 1 : blocks.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) {

                        blocks.bitb = b;
                        blocks.bitk = k;
                        z.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        blocks.write = q;
                        r = InflateFast (lbits, dbits, ltree, ltree_index, dtree, dtree_index, blocks, z);

                        p = z.NextIn;
                        n = z.AvailableBytesIn;
                        b = blocks.bitb;
                        k = blocks.bitk;
                        q = blocks.write;
                        m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;

                        if (r != ZlibConstants.Z_OK) {
                            mode = (r == ZlibConstants.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 = ZlibConstants.Z_OK;
                        else {

                            blocks.bitb = b;
                            blocks.bitk = k;
                            z.AvailableBytesIn = n;
                            z.TotalBytesIn += p - z.NextIn;
                            z.NextIn = p;
                            blocks.write = q;
                            return blocks.Flush (z, r);
                        }
                        n--;
                        b |= (z.InputBuffer [p++] & 0xff) << k;
                        k += 8;
                    }

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

                    b = SharedUtils.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.Message = "invalid literal/length code";
                    r = ZlibConstants.Z_DATA_ERROR;

                    blocks.bitb = b;
                    blocks.bitk = k;
                    z.AvailableBytesIn = n;
                    z.TotalBytesIn += p - z.NextIn;
                    z.NextIn = p;
                    blocks.write = q;
                    return blocks.Flush (z, r);

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

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

                            blocks.bitb = b;
                            blocks.bitk = k;
                            z.AvailableBytesIn = n;
                            z.TotalBytesIn += p - z.NextIn;
                            z.NextIn = p;
                            blocks.write = q;
                            return blocks.Flush (z, r);
                        }
                        n--;
                        b |= (z.InputBuffer [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 = ZlibConstants.Z_OK;
                        else {

                            blocks.bitb = b;
                            blocks.bitk = k;
                            z.AvailableBytesIn = n;
                            z.TotalBytesIn += p - z.NextIn;
                            z.NextIn = p;
                            blocks.write = q;
                            return blocks.Flush (z, r);
                        }
                        n--;
                        b |= (z.InputBuffer [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.Message = "invalid distance code";
                    r = ZlibConstants.Z_DATA_ERROR;

                    blocks.bitb = b;
                    blocks.bitk = k;
                    z.AvailableBytesIn = n;
                    z.TotalBytesIn += p - z.NextIn;
                    z.NextIn = p;
                    blocks.write = q;
                    return blocks.Flush (z, r);

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

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

                            blocks.bitb = b;
                            blocks.bitk = k;
                            z.AvailableBytesIn = n;
                            z.TotalBytesIn += p - z.NextIn;
                            z.NextIn = p;
                            blocks.write = q;
                            return blocks.Flush (z, r);
                        }
                        n--;
                        b |= (z.InputBuffer [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 += blocks.end; // of "if" handles invalid distances
                    }
                    while (len != 0) {

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

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

                                if (m == 0) {
                                    blocks.bitb = b;
                                    blocks.bitk = k;
                                    z.AvailableBytesIn = n;
                                    z.TotalBytesIn += p - z.NextIn;
                                    z.NextIn = p;
                                    blocks.write = q;
                                    return blocks.Flush (z, r);
                                }
                            }
                        }

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

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

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

                            if (q == blocks.end && blocks.read != 0) {
                                q = 0;
                                m = q < blocks.read ? blocks.read - q - 1 : blocks.end - q;
                            }
                            if (m == 0) {
                                blocks.bitb = b;
                                blocks.bitk = k;
                                z.AvailableBytesIn = n;
                                z.TotalBytesIn += p - z.NextIn;
                                z.NextIn = p;
                                blocks.write = q;
                                return blocks.Flush (z, r);
                            }
                        }
                    }
                    r = ZlibConstants.Z_OK;

                    blocks.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
                    }

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

                    if (blocks.read != blocks.write) {
                        blocks.bitb = b;
                        blocks.bitk = k;
                        z.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        blocks.write = q;
                        return blocks.Flush (z, r);
                    }
                    mode = END;
                    goto case END;

                case END:
                    r = ZlibConstants.Z_STREAM_END;
                    blocks.bitb = b;
                    blocks.bitk = k;
                    z.AvailableBytesIn = n;
                    z.TotalBytesIn += p - z.NextIn;
                    z.NextIn = p;
                    blocks.write = q;
                    return blocks.Flush (z, r);

                case BADCODE:  // x: got error

                    r = ZlibConstants.Z_DATA_ERROR;

                    blocks.bitb = b;
                    blocks.bitk = k;
                    z.AvailableBytesIn = n;
                    z.TotalBytesIn += p - z.NextIn;
                    z.NextIn = p;
                    blocks.write = q;
                    return blocks.Flush (z, r);

                default:
                    r = ZlibConstants.Z_STREAM_ERROR;

                    blocks.bitb = b;
                    blocks.bitk = k;
                    z.AvailableBytesIn = n;
                    z.TotalBytesIn += p - z.NextIn;
                    z.NextIn = p;
                    blocks.write = q;
                    return blocks.Flush (z, r);

                }
            }
        }
Exemplo n.º 11
0
        internal int Initialize(ZlibCodec z, int w)
        {
            z.Message = 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) {
                End (z);
                throw new ZlibException ("Bad window size.");

                //return ZlibConstants.Z_STREAM_ERROR;
            }
            wbits = w;

            z.istate.blocks = new InflateBlocks (z,
                z.istate.HandleRfc1950HeaderBytes ? this : null,
                1 << w);

            // reset state
            Reset (z);
            return ZlibConstants.Z_OK;
        }
Exemplo n.º 12
0
 internal void Init(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, ZlibCodec z)
 {
     mode = START;
     lbits = (byte)bl;
     dbits = (byte)bd;
     ltree = tl;
     ltree_index = tl_index;
     dtree = td;
     dtree_index = td_index;
     tree = null;
 }
Exemplo n.º 13
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 InflateFast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InflateBlocks s, ZlibCodec 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

            int tp_index_t_3; // (tp_index+t)*3

            // load input, output, bit values
            p = z.NextIn;
            n = z.AvailableBytesIn;
            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.InputBuffer [p++] & 0xff) << k;
                    k += 8;
                }

                t = b & ml;
                tp = tl;
                tp_index = tl_index;
                tp_index_t_3 = (tp_index + t) * 3;
                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.InputBuffer [p++] & 0xff) << k;
                            k += 8;
                        }

                        t = b & md;
                        tp = td;
                        tp_index = td_index;
                        tp_index_t_3 = (tp_index + t) * 3;
                        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.InputBuffer [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++]; // minimum count is three,
                                        s.window [q++] = s.window [r++]; // so unroll loop a little
                                        c -= 2;
                                    } 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]);
                                tp_index_t_3 = (tp_index + t) * 3;
                                e = tp [tp_index_t_3];
                            } else {
                                z.Message = "invalid distance code";

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

                                s.bitb = b;
                                s.bitk = k;
                                z.AvailableBytesIn = n;
                                z.TotalBytesIn += p - z.NextIn;
                                z.NextIn = p;
                                s.write = q;

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

                    if ((e & 64) == 0) {
                        t += tp [tp_index_t_3 + 2];
                        t += (b & inflate_mask [e]);
                        tp_index_t_3 = (tp_index + t) * 3;
                        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.AvailableBytesIn - n;
                        c = (k >> 3) < c ? k >> 3 : c;
                        n += c;
                        p -= c;
                        k -= (c << 3);

                        s.bitb = b;
                        s.bitk = k;
                        z.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        s.write = q;

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

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

                        s.bitb = b;
                        s.bitk = k;
                        z.AvailableBytesIn = n;
                        z.TotalBytesIn += p - z.NextIn;
                        z.NextIn = p;
                        s.write = q;

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

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

            s.bitb = b;
            s.bitk = k;
            z.AvailableBytesIn = n;
            z.TotalBytesIn += p - z.NextIn;
            z.NextIn = p;
            s.write = q;

            return ZlibConstants.Z_OK;
        }
Exemplo n.º 14
0
        internal int Inflate(ZlibCodec z, int f)
        {
            int r;
            int b;

            if (z == null)
                throw new ZlibException ("Codec is null. ");
            if (z.istate == null)
                throw new ZlibException ("InflateManager is null. ");
            if (z.InputBuffer == null)
                throw new ZlibException ("InputBuffer is null. ");

            //return ZlibConstants.Z_STREAM_ERROR;

            f = (f == ZlibConstants.Z_FINISH)
                ? ZlibConstants.Z_BUF_ERROR
                : ZlibConstants.Z_OK;
            r = ZlibConstants.Z_BUF_ERROR;
            while (true) {
                switch (z.istate.mode) {
                case METHOD:
                    if (z.AvailableBytesIn == 0)
                        return r;

                    r = f;

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;

                    if (((z.istate.method = z.InputBuffer [z.NextIn++]) & 0xf) != Z_DEFLATED) {
                        z.istate.mode = BAD;
                        z.Message = String.Format ("unknown compression method (0x{0:X2})", z.istate.method);
                        z.istate.marker = 5; // can't try inflateSync
                        break;
                    }
                    if ((z.istate.method >> 4) + 8 > z.istate.wbits) {
                        z.istate.mode = BAD;
                        z.Message = String.Format ("invalid window size ({0})", (z.istate.method >> 4) + 8);
                        z.istate.marker = 5; // can't try inflateSync
                        break;
                    }
                    z.istate.mode = FLAG;
                    goto case FLAG;

                case FLAG:

                    if (z.AvailableBytesIn == 0)
                        return r;

                    r = f;

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;
                    b = (z.InputBuffer [z.NextIn++]) & 0xff;

                    if ((((z.istate.method << 8) + b) % 31) != 0) {
                        z.istate.mode = BAD;
                        z.Message = "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.AvailableBytesIn == 0)
                        return r;

                    r = f;

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;
                    z.istate.need = ((z.InputBuffer [z.NextIn++] & 0xff) << 24) & unchecked((int)0xff000000L);
                    z.istate.mode = DICT3;
                    goto case DICT3;

                case DICT3:

                    if (z.AvailableBytesIn == 0)
                        return r;

                    r = f;

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;
                    z.istate.need += (((z.InputBuffer [z.NextIn++] & 0xff) << 16) & 0xff0000L);
                    z.istate.mode = DICT2;
                    goto case DICT2;

                case DICT2:

                    if (z.AvailableBytesIn == 0)
                        return r;

                    r = f;

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;
                    z.istate.need += (((z.InputBuffer [z.NextIn++] & 0xff) << 8) & 0xff00L);
                    z.istate.mode = DICT1;
                    goto case DICT1;

                case DICT1:

                    if (z.AvailableBytesIn == 0)
                        return r;

                    r = f;

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;
                    z.istate.need += (z.InputBuffer [z.NextIn++] & 0xffL);
                    z._Adler32 = z.istate.need;
                    z.istate.mode = DICT0;
                    return ZlibConstants.Z_NEED_DICT;

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

                case BLOCKS:
                    r = z.istate.blocks.Process (z, r);
                    if (r == ZlibConstants.Z_DATA_ERROR) {
                        z.istate.mode = BAD;
                        z.istate.marker = 0; // can try inflateSync
                        break;
                    }
                    if (r == ZlibConstants.Z_OK)
                        r = f;

                    if (r != ZlibConstants.Z_STREAM_END)
                        return r;

                    r = f;
                    z.istate.blocks.Reset (z, z.istate.was);
                    if (!z.istate.HandleRfc1950HeaderBytes) {
                        z.istate.mode = DONE;
                        break;
                    }
                    z.istate.mode = CHECK4;
                    goto case CHECK4;

                case CHECK4:

                    if (z.AvailableBytesIn == 0)
                        return r;

                    r = f;

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;
                    z.istate.need = ((z.InputBuffer [z.NextIn++] & 0xff) << 24) & unchecked((int)0xff000000L);
                    z.istate.mode = CHECK3;
                    goto case CHECK3;

                case CHECK3:

                    if (z.AvailableBytesIn == 0)
                        return r;

                    r = f;

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;
                    z.istate.need += (((z.InputBuffer [z.NextIn++] & 0xff) << 16) & 0xff0000L);
                    z.istate.mode = CHECK2;
                    goto case CHECK2;

                case CHECK2:

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

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;
                    z.istate.need += (((z.InputBuffer [z.NextIn++] & 0xff) << 8) & 0xff00L);
                    z.istate.mode = CHECK1;
                    goto case CHECK1;

                case CHECK1:

                    if (z.AvailableBytesIn == 0)
                        return r;

                    r = f;

                    z.AvailableBytesIn--;
                    z.TotalBytesIn++;
                    z.istate.need += (z.InputBuffer [z.NextIn++] & 0xffL);
                    unchecked {
                        if (((int)(z.istate.was [0])) != ((int)(z.istate.need))) {
                            z.istate.mode = BAD;
                            z.Message = "incorrect data check";
                            z.istate.marker = 5; // can't try inflateSync
                            break;
                        }
                    }
                    z.istate.mode = DONE;
                    goto case DONE;

                case DONE:
                    return ZlibConstants.Z_STREAM_END;

                case BAD:
                    throw new ZlibException (String.Format ("Bad state ({0})", z.Message));
                //return ZlibConstants.Z_DATA_ERROR;

                default:
                    throw new ZlibException ("Stream error.");
                //return ZlibConstants.Z_STREAM_ERROR;

                }
            }
        }
Exemplo n.º 15
0
        internal int inflate_trees_dynamic(int nl, int nd, int[] c, int[] bl, int[] bd, int[] tl, int[] td, int[] hp, ZlibCodec z)
        {
            int result;

            // build literal/length tree
            initWorkArea(288);
            hn[0] = 0;
            result = huft_build(c, 0, nl, 257, cplens, cplext, tl, bl, hp, hn, v);
            if (result != Z_OK || bl[0] == 0)
            {
                if (result == Z_DATA_ERROR)
                {
                    z.Message = "oversubscribed literal/length tree";
                }
                else if (result != Z_MEM_ERROR)
                {
                    z.Message = "incomplete literal/length tree";
                    result = Z_DATA_ERROR;
                }
                return result;
            }

            // build distance tree
            initWorkArea(288);
            result = huft_build(c, nl, nd, 0, cpdist, cpdext, td, bd, hp, hn, v);

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

            return Z_OK;
        }
Exemplo n.º 16
0
        internal int Sync(ZlibCodec 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 ZlibConstants.Z_STREAM_ERROR;
            if (z.istate.mode != BAD) {
                z.istate.mode = BAD;
                z.istate.marker = 0;
            }
            if ((n = z.AvailableBytesIn) == 0)
                return ZlibConstants.Z_BUF_ERROR;
            p = z.NextIn;
            m = z.istate.marker;

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

            // restore
            z.TotalBytesIn += p - z.NextIn;
            z.NextIn = p;
            z.AvailableBytesIn = n;
            z.istate.marker = m;

            // return no joy or set up to restart on a new block
            if (m != 4) {
                return ZlibConstants.Z_DATA_ERROR;
            }
            r = z.TotalBytesIn;
            w = z.TotalBytesOut;
            Reset (z);
            z.TotalBytesIn = r;
            z.TotalBytesOut = w;
            z.istate.mode = BLOCKS;
            return ZlibConstants.Z_OK;
        }
Exemplo n.º 17
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 internal static int inflate_trees_fixed(int[] bl, int[] bd, int[][] tl, int[][] td, ZlibCodec z)
 {
     bl[0] = fixed_bl;
     bd[0] = fixed_bd;
     tl[0] = fixed_tl;
     td[0] = fixed_td;
     return Z_OK;
 }
Exemplo n.º 18
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 SyncPoint(ZlibCodec z)
 {
     if (z == null || z.istate == null || z.istate.blocks == null)
         return ZlibConstants.Z_STREAM_ERROR;
     return z.istate.blocks.SyncPoint ();
 }
Exemplo n.º 19
0
        internal int Reset(ZlibCodec strm)
        {
            strm.TotalBytesIn = strm.TotalBytesOut = 0;
            strm.Message = null;
            //strm.data_type = Z_UNKNOWN;

            pendingCount = 0;
            nextPending = 0;

            Rfc1950BytesEmitted = false;

            status = (WantRfc1950HeaderBytes) ? INIT_STATE : BUSY_STATE;
            strm._Adler32 = Adler.Adler32 (0, null, 0, 0);

            last_flush = ZlibConstants.Z_NO_FLUSH;

            _InitializeTreeData ();
            _InitializeLazyMatch ();
            return ZlibConstants.Z_OK;
        }
Exemplo n.º 20
0
 internal InflateBlocks(ZlibCodec 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);
 }
Exemplo n.º 21
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        internal int SetParams(ZlibCodec strm, CompressionLevel _level, CompressionStrategy _strategy)
        {
            int result = ZlibConstants.Z_OK;

            if (configTable [(int)compressionLevel].func != configTable [(int)_level].func && strm.TotalBytesIn != 0) {
                // Flush the last buffer:
                result = strm.Deflate (ZlibConstants.Z_PARTIAL_FLUSH);
            }

            if (compressionLevel != _level) {
                compressionLevel = _level;
                max_lazy_match = configTable [(int)compressionLevel].max_lazy;
                good_match = configTable [(int)compressionLevel].good_length;
                nice_match = configTable [(int)compressionLevel].nice_length;
                max_chain_length = configTable [(int)compressionLevel].max_chain;
            }
            compressionStrategy = _strategy;
            return result;
        }
Exemplo n.º 22
0
        // copy as much as possible from the sliding window to the output area
        internal int Flush(ZlibCodec z, int r)
        {
            int n;
            int p;
            int q;

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

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

            // update counters
            z.AvailableBytesOut -= n;
            z.TotalBytesOut += n;

            // update check information
            if (checkfn != null)
                z._Adler32 = check = Adler.Adler32 (check, window, q, n);

            // copy as far as end of window
            Array.Copy (window, q, z.OutputBuffer, 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.AvailableBytesOut)
                    n = z.AvailableBytesOut;
                if (n != 0 && r == ZlibConstants.Z_BUF_ERROR)
                    r = ZlibConstants.Z_OK;

                // update counters
                z.AvailableBytesOut -= n;
                z.TotalBytesOut += n;

                // update check information
                if (checkfn != null)
                    z._Adler32 = check = Adler.Adler32 (check, window, q, n);

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

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

            // done
            return r;
        }
Exemplo n.º 23
0
 internal int Initialize(ZlibCodec strm, CompressionLevel level, int bits)
 {
     return Initialize (strm, level, Z_DEFLATED, bits, MEM_LEVEL_DEFAULT, CompressionStrategy.DEFAULT);
 }
Exemplo n.º 24
0
 internal void Free(ZlibCodec z)
 {
     Reset (z, null);
     window = null;
     hufts = null;
     //ZFREE(z, s);
 }
Exemplo n.º 25
0
        internal int Initialize(ZlibCodec stream, CompressionLevel level, int method, int windowBits, int memLevel, CompressionStrategy strategy)
        {
            stream.Message = null;

            // validation
            if (windowBits < 9 || windowBits > 15)
                throw new ZlibException ("windowBits must be in the range 9..15.");

            if (memLevel < 1 || memLevel > MEM_LEVEL_MAX)
                throw new ZlibException (String.Format ("memLevel must be in the range 1.. {0}", MEM_LEVEL_MAX));

            if (method != Z_DEFLATED)
                throw new ZlibException ("Unexpected value for method: it must be Z_DEFLATED.");

            stream.dstate = this;

            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 = new byte[lit_bufsize * 4];

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

            this.compressionLevel = level;
            this.compressionStrategy = strategy;
            this.method = (sbyte)method;

            return Reset (stream);
        }
Exemplo n.º 26
0
        internal void Reset(ZlibCodec z, long[] c)
        {
            if (c != null)
                c [0] = check;
            if (mode == BTREE || mode == DTREE) {
            }
            if (mode == CODES) {
            }
            mode = TYPE;
            bitk = 0;
            bitb = 0;
            read = write = 0;

            if (checkfn != null)
                z._Adler32 = check = Adler.Adler32 (0L, null, 0, 0);
        }