internal int End() { if (this.blocks != null) { this.blocks.Free(); } this.blocks = null; return(0); }
internal int Initialize(ZlibCodec codec, int w) { this._codec = codec; this._codec.Message = null; this.blocks = null; if (w < 8 || w > 15) { this.End(); throw new ZlibException("Bad window size."); } this.wbits = w; this.blocks = new InflateBlocks(codec, (!this.HandleRfc1950HeaderBytes) ? null : this, 1 << w); this.Reset(); return(0); }
internal int Process(InflateBlocks blocks, int r) { ZlibCodec codec = blocks._codec; int num = codec.NextIn; int num2 = codec.AvailableBytesIn; int num3 = blocks.bitb; int i = blocks.bitk; int num4 = blocks.writeAt; int num5 = (num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1); while (true) { int num6; switch (this.mode) { case 0: if (num5 >= 258 && num2 >= 10) { blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; r = this.InflateFast((int)this.lbits, (int)this.dbits, this.ltree, this.ltree_index, this.dtree, this.dtree_index, blocks, codec); num = codec.NextIn; num2 = codec.AvailableBytesIn; num3 = blocks.bitb; i = blocks.bitk; num4 = blocks.writeAt; num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1)); if (r != 0) { this.mode = ((r != 1) ? 9 : 7); continue; } } this.need = (int)this.lbits; this.tree = this.ltree; this.tree_index = this.ltree_index; this.mode = 1; goto IL_1C4; case 1: goto IL_1C4; case 2: num6 = this.bitsToGet; while (i < num6) { if (num2 == 0) { goto IL_3A2; } r = 0; num2--; num3 |= (int)(codec.InputBuffer[num++] & 255) << i; i += 8; } this.len += (num3 & InternalInflateConstants.InflateMask[num6]); num3 >>= num6; i -= num6; this.need = (int)this.dbits; this.tree = this.dtree; this.tree_index = this.dtree_index; this.mode = 3; goto IL_471; case 3: goto IL_471; case 4: num6 = this.bitsToGet; while (i < num6) { if (num2 == 0) { goto IL_618; } r = 0; num2--; num3 |= (int)(codec.InputBuffer[num++] & 255) << i; i += 8; } this.dist += (num3 & InternalInflateConstants.InflateMask[num6]); num3 >>= num6; i -= num6; this.mode = 5; goto IL_6C3; case 5: goto IL_6C3; case 6: if (num5 == 0) { if (num4 == blocks.end && blocks.readAt != 0) { num4 = 0; num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1)); } if (num5 == 0) { blocks.writeAt = num4; r = blocks.Flush(r); num4 = blocks.writeAt; num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1)); if (num4 == blocks.end && blocks.readAt != 0) { num4 = 0; num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1)); } if (num5 == 0) { goto Block_44; } } } r = 0; blocks.window[num4++] = (byte)this.lit; num5--; this.mode = 0; continue; case 7: goto IL_9B8; case 8: goto IL_A7A; case 9: goto IL_AC7; } break; continue; IL_1C4: num6 = this.need; while (i < num6) { if (num2 == 0) { goto IL_1DF; } r = 0; num2--; num3 |= (int)(codec.InputBuffer[num++] & 255) << i; i += 8; } int num7 = (this.tree_index + (num3 & InternalInflateConstants.InflateMask[num6])) * 3; num3 >>= this.tree[num7 + 1]; i -= this.tree[num7 + 1]; int num8 = this.tree[num7]; if (num8 == 0) { this.lit = this.tree[num7 + 2]; this.mode = 6; continue; } if ((num8 & 16) != 0) { this.bitsToGet = (num8 & 15); this.len = this.tree[num7 + 2]; this.mode = 2; continue; } if ((num8 & 64) == 0) { this.need = num8; this.tree_index = num7 / 3 + this.tree[num7 + 2]; continue; } if ((num8 & 32) != 0) { this.mode = 7; continue; } goto IL_325; IL_471: num6 = this.need; while (i < num6) { if (num2 == 0) { goto IL_48C; } r = 0; num2--; num3 |= (int)(codec.InputBuffer[num++] & 255) << i; i += 8; } num7 = (this.tree_index + (num3 & InternalInflateConstants.InflateMask[num6])) * 3; num3 >>= this.tree[num7 + 1]; i -= this.tree[num7 + 1]; num8 = this.tree[num7]; if ((num8 & 16) != 0) { this.bitsToGet = (num8 & 15); this.dist = this.tree[num7 + 2]; this.mode = 4; continue; } if ((num8 & 64) == 0) { this.need = num8; this.tree_index = num7 / 3 + this.tree[num7 + 2]; continue; } goto IL_59B; IL_6C3: int j; for (j = num4 - this.dist; j < 0; j += blocks.end) { } while (this.len != 0) { if (num5 == 0) { if (num4 == blocks.end && blocks.readAt != 0) { num4 = 0; num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1)); } if (num5 == 0) { blocks.writeAt = num4; r = blocks.Flush(r); num4 = blocks.writeAt; num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1)); if (num4 == blocks.end && blocks.readAt != 0) { num4 = 0; num5 = ((num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1)); } if (num5 == 0) { goto Block_32; } } } blocks.window[num4++] = blocks.window[j++]; num5--; if (j == blocks.end) { j = 0; } this.len--; } this.mode = 0; } r = -2; blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); IL_1DF: blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); IL_325: this.mode = 9; codec.Message = "invalid literal/length code"; r = -3; blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); IL_3A2: blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); IL_48C: blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); IL_59B: this.mode = 9; codec.Message = "invalid distance code"; r = -3; blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); IL_618: blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); Block_32: blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); Block_44: blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); IL_9B8: if (i > 7) { i -= 8; num2++; num--; } blocks.writeAt = num4; r = blocks.Flush(r); num4 = blocks.writeAt; int arg_A11_0 = (num4 >= blocks.readAt) ? (blocks.end - num4) : (blocks.readAt - num4 - 1); if (blocks.readAt != blocks.writeAt) { blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); } this.mode = 8; IL_A7A: r = 1; blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); IL_AC7: r = -3; blocks.bitb = num3; blocks.bitk = i; codec.AvailableBytesIn = num2; codec.TotalBytesIn += (long)(num - codec.NextIn); codec.NextIn = num; blocks.writeAt = num4; return(blocks.Flush(r)); }
internal int InflateFast(int bl, int bd, int[] tl, int tl_index, int[] td, int td_index, InflateBlocks s, ZlibCodec z) { int num = z.NextIn; int num2 = z.AvailableBytesIn; int num3 = s.bitb; int i = s.bitk; int num4 = s.writeAt; int num5 = (num4 >= s.readAt) ? (s.end - num4) : (s.readAt - num4 - 1); int num6 = InternalInflateConstants.InflateMask[bl]; int num7 = InternalInflateConstants.InflateMask[bd]; int num10; int num11; while (true) { while (i < 20) { num2--; num3 |= (int)(z.InputBuffer[num++] & 255) << i; i += 8; } int num8 = num3 & num6; int num9 = (tl_index + num8) * 3; if ((num10 = tl[num9]) == 0) { num3 >>= tl[num9 + 1]; i -= tl[num9 + 1]; s.window[num4++] = (byte)tl[num9 + 2]; num5--; } else { while (true) { num3 >>= tl[num9 + 1]; i -= tl[num9 + 1]; if ((num10 & 16) != 0) { break; } if ((num10 & 64) != 0) { goto IL_50A; } num8 += tl[num9 + 2]; num8 += (num3 & InternalInflateConstants.InflateMask[num10]); num9 = (tl_index + num8) * 3; if ((num10 = tl[num9]) == 0) { goto Block_20; } } num10 &= 15; num11 = tl[num9 + 2] + (num3 & InternalInflateConstants.InflateMask[num10]); num3 >>= num10; for (i -= num10; i < 15; i += 8) { num2--; num3 |= (int)(z.InputBuffer[num++] & 255) << i; } num8 = (num3 & num7); num9 = (td_index + num8) * 3; num10 = td[num9]; while (true) { num3 >>= td[num9 + 1]; i -= td[num9 + 1]; if ((num10 & 16) != 0) { break; } if ((num10 & 64) != 0) { goto IL_400; } num8 += td[num9 + 2]; num8 += (num3 & InternalInflateConstants.InflateMask[num10]); num9 = (td_index + num8) * 3; num10 = td[num9]; } num10 &= 15; while (i < num10) { num2--; num3 |= (int)(z.InputBuffer[num++] & 255) << i; i += 8; } int num12 = td[num9 + 2] + (num3 & InternalInflateConstants.InflateMask[num10]); num3 >>= num10; i -= num10; num5 -= num11; int num13; if (num4 >= num12) { num13 = num4 - num12; if (num4 - num13 > 0 && 2 > num4 - num13) { s.window[num4++] = s.window[num13++]; s.window[num4++] = s.window[num13++]; num11 -= 2; } else { Array.Copy(s.window, num13, s.window, num4, 2); num4 += 2; num13 += 2; num11 -= 2; } } else { num13 = num4 - num12; do { num13 += s.end; }while (num13 < 0); num10 = s.end - num13; if (num11 > num10) { num11 -= num10; if (num4 - num13 > 0 && num10 > num4 - num13) { do { s.window[num4++] = s.window[num13++]; }while (--num10 != 0); } else { Array.Copy(s.window, num13, s.window, num4, num10); num4 += num10; num13 += num10; } num13 = 0; } } if (num4 - num13 > 0 && num11 > num4 - num13) { do { s.window[num4++] = s.window[num13++]; }while (--num11 != 0); } else { Array.Copy(s.window, num13, s.window, num4, num11); num4 += num11; num13 += num11; } goto IL_62B; Block_20: num3 >>= tl[num9 + 1]; i -= tl[num9 + 1]; s.window[num4++] = (byte)tl[num9 + 2]; num5--; } IL_62B: if (num5 < 258 || num2 < 10) { goto IL_640; } } IL_400: z.Message = "invalid distance code"; num11 = z.AvailableBytesIn - num2; num11 = ((i >> 3 >= num11) ? num11 : (i >> 3)); num2 += num11; num -= num11; i -= num11 << 3; s.bitb = num3; s.bitk = i; z.AvailableBytesIn = num2; z.TotalBytesIn += (long)(num - z.NextIn); z.NextIn = num; s.writeAt = num4; return(-3); IL_50A: if ((num10 & 32) != 0) { num11 = z.AvailableBytesIn - num2; num11 = ((i >> 3 >= num11) ? num11 : (i >> 3)); num2 += num11; num -= num11; i -= num11 << 3; s.bitb = num3; s.bitk = i; z.AvailableBytesIn = num2; z.TotalBytesIn += (long)(num - z.NextIn); z.NextIn = num; s.writeAt = num4; return(1); } z.Message = "invalid literal/length code"; num11 = z.AvailableBytesIn - num2; num11 = ((i >> 3 >= num11) ? num11 : (i >> 3)); num2 += num11; num -= num11; i -= num11 << 3; s.bitb = num3; s.bitk = i; z.AvailableBytesIn = num2; z.TotalBytesIn += (long)(num - z.NextIn); z.NextIn = num; s.writeAt = num4; return(-3); IL_640: num11 = z.AvailableBytesIn - num2; num11 = ((i >> 3 >= num11) ? num11 : (i >> 3)); num2 += num11; num -= num11; i -= num11 << 3; s.bitb = num3; s.bitk = i; z.AvailableBytesIn = num2; z.TotalBytesIn += (long)(num - z.NextIn); z.NextIn = num; s.writeAt = num4; return(0); }