public Inflater(bool noHeader) { this.noHeader = noHeader; this.adler = new Adler32(); this.input = new StreamManipulator(); this.outputWindow = new OutputWindow(); this.mode = noHeader ? 2 : 0; }
public bool Decode(StreamManipulator input) { int num2; int num3; Label_0000: switch (this.mode) { case 0: this.lnum = input.PeekBits(5); if (this.lnum >= 0) { this.lnum += 0x101; input.DropBits(5); this.mode = 1; break; } return false; case 1: break; case 2: goto Label_00B9; case 3: goto Label_013B; case 4: goto Label_01A8; case 5: goto Label_01EE; default: goto Label_0000; } this.dnum = input.PeekBits(5); if (this.dnum < 0) { return false; } this.dnum++; input.DropBits(5); this.num = this.lnum + this.dnum; this.litdistLens = new byte[this.num]; this.mode = 2; Label_00B9: this.blnum = input.PeekBits(4); if (this.blnum < 0) { return false; } this.blnum += 4; input.DropBits(4); this.blLens = new byte[0x13]; this.ptr = 0; this.mode = 3; Label_013B: while (this.ptr < this.blnum) { int num = input.PeekBits(3); if (num < 0) { return false; } input.DropBits(3); this.blLens[BL_ORDER[this.ptr]] = (byte) num; this.ptr++; } this.blTree = new InflaterHuffmanTree(this.blLens); this.blLens = null; this.ptr = 0; this.mode = 4; Label_01A8: while (((num2 = this.blTree.GetSymbol(input)) & -16) == 0) { this.litdistLens[this.ptr++] = this.lastLen = (byte) num2; if (this.ptr == this.num) { return true; } } if (num2 < 0) { return false; } if (num2 >= 0x11) { this.lastLen = 0; } else if (this.ptr == 0) { throw new SharpZipBaseException(); } this.repSymbol = num2 - 0x10; this.mode = 5; Label_01EE: num3 = repBits[this.repSymbol]; int num4 = input.PeekBits(num3); if (num4 < 0) { return false; } input.DropBits(num3); num4 += repMin[this.repSymbol]; if ((this.ptr + num4) > this.num) { throw new SharpZipBaseException(); } while (num4-- > 0) { this.litdistLens[this.ptr++] = this.lastLen; } if (this.ptr == this.num) { return true; } this.mode = 4; goto Label_0000; }