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146 lines
3.6 KiB
146 lines
3.6 KiB
<?php
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/*
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* Copyright 2015 Google Inc.
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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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namespace Google\FlatBuffers;
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abstract class Table
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{
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/**
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* @var int $bb_pos
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*/
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protected $bb_pos;
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/**
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* @var ByteBuffer $bb
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*/
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protected $bb;
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public function __construct()
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{
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}
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public function setByteBufferPos($pos)
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{
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$this->bb_pos = $pos;
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}
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public function setByteBuffer($bb)
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{
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$this->bb = $bb;
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}
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/**
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* returns actual vtable offset
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*
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* @param $vtable_offset
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* @return int offset > 0 means exist value. 0 means not exist
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*/
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protected function __offset($vtable_offset)
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{
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$vtable = $this->bb_pos - $this->bb->getInt($this->bb_pos);
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return $vtable_offset < $this->bb->getShort($vtable) ? $this->bb->getShort($vtable + $vtable_offset) : 0;
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}
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/**
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* @param $offset
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* @return mixed
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*/
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protected function __indirect($offset)
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{
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return $offset + $this->bb->getInt($offset);
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}
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/**
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* fetch utf8 encoded string.
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*
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* @param $offset
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* @return string
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*/
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protected function __string($offset)
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{
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$offset += $this->bb->getInt($offset);
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$len = $this->bb->getInt($offset);
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$startPos = $offset + Constants::SIZEOF_INT;
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return substr($this->bb->_buffer, $startPos, $len);
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}
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/**
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* @param $offset
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* @return int
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*/
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protected function __vector_len($offset)
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{
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$offset += $this->bb_pos;
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$offset += $this->bb->getInt($offset);
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return $this->bb->getInt($offset);
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}
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/**
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* @param $offset
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* @return int
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*/
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protected function __vector($offset)
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{
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$offset += $this->bb_pos;
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// data starts after the length
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return $offset + $this->bb->getInt($offset) + Constants::SIZEOF_INT;
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}
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protected function __vector_as_bytes($vector_offset, $elem_size=1)
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{
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$o = $this->__offset($vector_offset);
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if ($o == 0) {
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return null;
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}
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return substr($this->bb->_buffer, $this->__vector($o), $this->__vector_len($o) * $elem_size);
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}
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/**
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* @param Table $table
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* @param int $offset
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* @return Table
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*/
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protected function __union($table, $offset)
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{
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$offset += $this->bb_pos;
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$table->setByteBufferPos($offset + $this->bb->getInt($offset));
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$table->setByteBuffer($this->bb);
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return $table;
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}
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/**
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* @param ByteBuffer $bb
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* @param string $ident
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* @return bool
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* @throws \ArgumentException
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*/
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protected static function __has_identifier($bb, $ident)
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{
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if (strlen($ident) != Constants::FILE_IDENTIFIER_LENGTH) {
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throw new \ArgumentException("FlatBuffers: file identifier must be length " . Constants::FILE_IDENTIFIER_LENGTH);
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}
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for ($i = 0; $i < 4; $i++) {
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if ($ident[$i] != $bb->get($bb->getPosition() + Constants::SIZEOF_INT + $i)) {
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return false;
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}
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}
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return true;
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}
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}
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