infblocks.java

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/* -*-mode:java; c-basic-offset:2; -*- */
/*
Copyright (c) 2000,2001,2002,2003 ymnk, JCraft,Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright 
notice, this list of conditions and the following disclaimer in 
the documentation and/or other materials provided with the distribution.
3. The names of the authors may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * This program is based on zlib-1.1.3, so all credit should go authors
 * Jean-loup Gailly([e-mail]) and Mark Adler([e-mail])
 * and contributors of zlib.
 */
/*                                                                              
 *Modified by Asoft ltd. at 2003 for running on J2ME platform                   
 *www.asoft.ru                                                                  
 *Alexandre Rusev [e-mail]                                                
 *Alexey Soloviev [e-mail]                                             
 */
package com.asoft.midp.jzlib;

import com.asoft.midp.dynarray.*;

final class InfBlocks
{

    private final static int DEBUG = 5;
    static final private int MANY = 1440;

    // And'ing with mask[n] masks the lower n bits
    static final private int[] inflate_mask = {
        0x00000000, 0x00000001, 0x00000003, 0x00000007, 0x0000000f,
        0x0000001f, 0x0000003f, 0x0000007f, 0x000000ff, 0x000001ff,
        0x000003ff, 0x000007ff, 0x00000fff, 0x00001fff, 0x00003fff,
        0x00007fff, 0x0000ffff
    };

    // Table for deflate from PKZIP's appnote.txt.
    static final int[] border = { // Order of the bit length code lengths
        16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
    static final private int Z_OK = 0;
    static final private int Z_STREAM_END = 1;
    static final private int Z_NEED_DICT = 2;
    static final private int Z_ERRNO = -1;
    static final private int Z_STREAM_ERROR = -2;
    static final private int Z_DATA_ERROR = -3;
    static final private int Z_MEM_ERROR = -4;
    static final private int Z_BUF_ERROR = -5;
    static final private int Z_VERSION_ERROR = -6;
    static final private int TYPE = 0;  // get type bits (3, including end bit)
    static final private int LENS = 1;  // get lengths for stored
    static final private int STORED = 2;// processing stored block
    static final private int TABLE = 3; // get table lengths
    static final private int BTREE = 4; // get bit lengths tree for a dynamic block
    static final private int DTREE = 5; // get length, distance trees for a dynamic block
    static final private int CODES = 6; // processing fixed or dynamic block
    static final private int DRY = 7;   // output remaining window bytes
    static final private int DONE = 8;  // finished last block, done
    static final private int BAD = 9;   // ot a data error--stuck here
    int mode;            // current inflate_block mode 
    int left;            // if STORED, bytes left to copy 
    int table;           // table lengths (14 bits) 
    int index;           // index into blens (or border) 
    int[] blens;         // bit lengths of codes 
    int[] bb = new int[1]; // bit length tree depth 
    int[] tb = new int[1]; // bit length decoding tree 
    InfCodes codes;      // if CODES, current state 
    int last;            // true if this block is the last block 

    // mode independent information 
    int bitk;            // bits in bit buffer 
    int bitb;            // bit buffer 
    int_array hufts;         // single malloc for tree space 
    byte_array window;       // sliding window 
    int end;             // one byte after sliding window 
    int read;            // window read pointer 
    int write;           // window write pointer 
    Object checkfn;      // check function 
    long check;          // check on output 

    InfBlocks(ZStream z, Object checkfn, int w)
    {
        hufts = new_int(MANY * 3, 128, "hufts");
        window = new_byte(w, "window");
        end = w;
        this.checkfn = checkfn;
        mode = TYPE;
        reset(z, null);
    }

    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, (byte_array) null, 0, 0);
        }
    }

    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 (t >>> 1)
                    {
                        case 0:                         // stored 
                            {
                                b >>>= (3);
                                k -= (3);
                            }
                            t = k & 7;                    // go to byte boundary
                            {
                                b >>>= (t);
                                k -= (t);
                            }
                            mode = LENS;                  // get length of stored block
                            break;
                        case 1:                         // fixed
                            {
                                //��� �������� ���� ����������� �������� ���������� ����� C
                                //������ ������� inflate_trees_fixed(..) ��� �������� �������� ��
                                //���� ����������. ��� ��������� ��� ������� ����������� tl � td
                                //������ �� ��������� ����������� ������� (�������� ����� tl - ����� 2000
                                //int-��)
                                int[] bl = new int[1];
                                int[] bd = new int[1];
                                //int[][] tl=new int[1][];
                                int_AccessibleArray[] tl = new int_AccessibleArray[1];
                                //int[][] td=new int[1][];
                                int_AccessibleArray[] td = new int_AccessibleArray[1];

                                InfTree.inflate_trees_fixed(bl, bd, tl, td, z);
                                codes = new InfCodes(bl[0], bd[0], tl[0], td[0], z);
                            }
                            {
                                b >>>= (3);
                                k -= (3);
                            }

                            mode = CODES;
                            break;
                        case 2:                         // dynamic
                            {
                                b >>>= (3);
                                k -= (3);
                            }

                            mode = TABLE;
                            break;
                        case 3:                         // illegal
                            {
                                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 ((((~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;
                    }
                    //System.arraycopy(z.next_in, p, window, q, t);
                    byte_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 >>>= (14);
                        k -= (14);
                    }

                    index = 0;
                    mode = BTREE;
                case BTREE:
                    while (index < 4 + (table >>> 10))
                    {
                        while (k < (3))
                        {
                            if (n != 0)
                            {
                                r = Z_OK;
                            }
                            else