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