示例#1
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;
		}
示例#2
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;
		}
示例#3
0
		internal int inflateEnd(ZStream z)
		{
			if (blocks != null)
				blocks.free(z);
			blocks = null;
			//    ZFREE(z, z->state);
			return Z_OK;
		}
示例#4
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);
					
				}
			}
		}