/* * Copyright 2014 Google Inc. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ using System; using System.Text; namespace FlatBuffers { /// /// All tables in the generated code derive from this class, and add their own accessors. /// public abstract class Table { protected int bb_pos; protected ByteBuffer bb; public ByteBuffer ByteBuffer { get { return bb; } } // Look up a field in the vtable, return an offset into the object, or 0 if the field is not // present. protected int __offset(int vtableOffset) { int vtable = bb_pos - bb.GetInt(bb_pos); return vtableOffset < bb.GetShort(vtable) ? (int)bb.GetShort(vtable + vtableOffset) : 0; } protected static int __offset(int vtableOffset, int offset, ByteBuffer bb) { int vtable = bb.Length - offset; return (int)bb.GetShort(vtable + vtableOffset - bb.GetInt(vtable)) + vtable; } // Retrieve the relative offset stored at "offset" protected int __indirect(int offset) { return offset + bb.GetInt(offset); } // Create a .NET String from UTF-8 data stored inside the flatbuffer. protected string __string(int offset) { offset += bb.GetInt(offset); var len = bb.GetInt(offset); var startPos = offset + sizeof(int); return Encoding.UTF8.GetString(bb.Data, startPos , len); } // Get the length of a vector whose offset is stored at "offset" in this object. protected int __vector_len(int offset) { offset += bb_pos; offset += bb.GetInt(offset); return bb.GetInt(offset); } // Get the start of data of a vector whose offset is stored at "offset" in this object. protected int __vector(int offset) { offset += bb_pos; return offset + bb.GetInt(offset) + sizeof(int); // data starts after the length } // Get the data of a vector whoses offset is stored at "offset" in this object as an // ArraySegment<byte>. If the vector is not present in the ByteBuffer, // then a null value will be returned. protected ArraySegment? __vector_as_arraysegment(int offset) { var o = this.__offset(offset); if (0 == o) { return null; } var pos = this.__vector(o); var len = this.__vector_len(o); return new ArraySegment(this.bb.Data, pos, len); } // Initialize any Table-derived type to point to the union at the given offset. protected TTable __union(TTable t, int offset) where TTable : Table { offset += bb_pos; t.bb_pos = offset + bb.GetInt(offset); t.bb = bb; return t; } protected static bool __has_identifier(ByteBuffer bb, string ident) { if (ident.Length != FlatBufferConstants.FileIdentifierLength) throw new ArgumentException("FlatBuffers: file identifier must be length " + FlatBufferConstants.FileIdentifierLength, "ident"); for (var i = 0; i < FlatBufferConstants.FileIdentifierLength; i++) { if (ident[i] != (char)bb.Get(bb.Position + sizeof(int) + i)) return false; } return true; } // Compare strings in the ByteBuffer. protected static int CompareStrings(int offset_1, int offset_2, ByteBuffer bb) { offset_1 += bb.GetInt(offset_1); offset_2 += bb.GetInt(offset_2); var len_1 = bb.GetInt(offset_1); var len_2 = bb.GetInt(offset_2); var startPos_1 = offset_1 + sizeof(int); var startPos_2 = offset_2 + sizeof(int); var len = Math.Min(len_1, len_2); for(int i = 0; i < len; i++) { if (bb.Data[i + startPos_1] != bb.Data[i + startPos_2]) return bb.Data[i + startPos_1] - bb.Data[i + startPos_2]; } if (len_1 < len_2) return -1; if (len_1 > len_2) return 1; return 0; } } }