internal int Inflate() { if (_codec.InputBuffer == null) { throw new InvalidOperationException("InputBuffer is null. "); } int r = RCode.BufferError; if (!done) { r = blocks.Process(r); if (r == RCode.DataError) { throw new InvalidDataException("Bad state"); } if (r != RCode.StreamEnd) { return(r); } blocks.Reset(); done = true; } return(RCode.StreamEnd); }
internal int Inflate(FlushType flush) { int b; if (_codec.InputBuffer == null) { throw new ZlibException("InputBuffer is null. "); } // int f = (flush == FlushType.Finish) // ? ZlibConstants.Z_BUF_ERROR // : ZlibConstants.Z_OK; // workitem 8870 int f = ZlibConstants.Z_OK; int r = ZlibConstants.Z_BUF_ERROR; while (true) { switch (mode) { case InflateManagerMode.METHOD: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; if (((method = _codec.InputBuffer[_codec.NextIn++]) & 0xf) != Z_DEFLATED) { mode = InflateManagerMode.BAD; _codec.Message = String.Format("unknown compression method (0x{0:X2})", method); marker = 5; // can't try inflateSync break; } if ((method >> 4) + 8 > wbits) { mode = InflateManagerMode.BAD; _codec.Message = String.Format("invalid window size ({0})", (method >> 4) + 8); marker = 5; // can't try inflateSync break; } mode = InflateManagerMode.FLAG; break; case InflateManagerMode.FLAG: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; b = (_codec.InputBuffer[_codec.NextIn++]) & 0xff; if ((((method << 8) + b) % 31) != 0) { mode = InflateManagerMode.BAD; _codec.Message = "incorrect header check"; marker = 5; // can't try inflateSync break; } mode = ((b & PRESET_DICT) == 0) ? InflateManagerMode.BLOCKS : InflateManagerMode.DICT4; break; case InflateManagerMode.DICT4: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; expectedCheck = (uint)((_codec.InputBuffer[_codec.NextIn++] << 24) & 0xff000000); mode = InflateManagerMode.DICT3; break; case InflateManagerMode.DICT3: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; expectedCheck += (uint)((_codec.InputBuffer[_codec.NextIn++] << 16) & 0x00ff0000); mode = InflateManagerMode.DICT2; break; case InflateManagerMode.DICT2: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; expectedCheck += (uint)((_codec.InputBuffer[_codec.NextIn++] << 8) & 0x0000ff00); mode = InflateManagerMode.DICT1; break; case InflateManagerMode.DICT1: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; expectedCheck += (uint)(_codec.InputBuffer[_codec.NextIn++] & 0x000000ff); _codec._Adler32 = expectedCheck; mode = InflateManagerMode.DICT0; return(ZlibConstants.Z_NEED_DICT); case InflateManagerMode.DICT0: mode = InflateManagerMode.BAD; _codec.Message = "need dictionary"; marker = 0; // can try inflateSync return(ZlibConstants.Z_STREAM_ERROR); case InflateManagerMode.BLOCKS: r = blocks.Process(r); if (r == ZlibConstants.Z_DATA_ERROR) { mode = InflateManagerMode.BAD; marker = 0; // can try inflateSync break; } if (r == ZlibConstants.Z_OK) { r = f; } if (r != ZlibConstants.Z_STREAM_END) { return(r); } r = f; computedCheck = blocks.Reset(); if (!HandleRfc1950HeaderBytes) { mode = InflateManagerMode.DONE; return(ZlibConstants.Z_STREAM_END); } mode = InflateManagerMode.CHECK4; break; case InflateManagerMode.CHECK4: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; expectedCheck = (uint)((_codec.InputBuffer[_codec.NextIn++] << 24) & 0xff000000); mode = InflateManagerMode.CHECK3; break; case InflateManagerMode.CHECK3: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; expectedCheck += (uint)((_codec.InputBuffer[_codec.NextIn++] << 16) & 0x00ff0000); mode = InflateManagerMode.CHECK2; break; case InflateManagerMode.CHECK2: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; expectedCheck += (uint)((_codec.InputBuffer[_codec.NextIn++] << 8) & 0x0000ff00); mode = InflateManagerMode.CHECK1; break; case InflateManagerMode.CHECK1: if (_codec.AvailableBytesIn == 0) { return(r); } r = f; _codec.AvailableBytesIn--; _codec.TotalBytesIn++; expectedCheck += (uint)(_codec.InputBuffer[_codec.NextIn++] & 0x000000ff); if (computedCheck != expectedCheck) { mode = InflateManagerMode.BAD; _codec.Message = "incorrect data check"; marker = 5; // can't try inflateSync break; } mode = InflateManagerMode.DONE; return(ZlibConstants.Z_STREAM_END); case InflateManagerMode.DONE: return(ZlibConstants.Z_STREAM_END); case InflateManagerMode.BAD: throw new ZlibException(String.Format("Bad state ({0})", _codec.Message)); default: throw new ZlibException("Stream error."); } } }