c85675e181
* port extended client file handling from other branch * class DBC -> DBCReader now initializes a DBCFile which itself is a BinaryFile * update DBCReader to use the new DB wrappers multi-insert feature
83 lines
2.2 KiB
PHP
83 lines
2.2 KiB
PHP
<?php
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namespace Aowow;
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if (!defined('AOWOW_REVISION'))
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die('illegal access');
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class DBCFile extends BinaryFile
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{
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private const /* string */ MAGIC = 'WDBC';
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private const /* int */ HEADER_SIZE = 16;
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private readonly int $stringSize;
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private readonly int $stringOffset;
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public readonly int $nCols;
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public readonly int $nRows;
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public readonly int $recordSize;
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public function __construct(string $file)
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{
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parent::__construct($file);
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if ($this->filesize < strlen(self::MAGIC) + self::HEADER_SIZE)
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{
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$this->error = 'file '.$file.' too small for a dbc';
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$this->close();
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return;
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}
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if ($this->read(4) != self::MAGIC)
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{
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$this->error = 'file '.$file.' has incorrect magic bytes';
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$this->close();
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return;
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}
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[, $this->nRows, $this->nCols, $this->recordSize, $this->stringSize] = unpack(UInt32::PACK_FMT.'4', $this->read(self::HEADER_SIZE));
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$this->stringOffset = strlen(self::MAGIC) + self::HEADER_SIZE + $this->recordSize * $this->nRows;
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if ($this->stringOffset + $this->stringSize != $this->filesize)
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{
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$this->error = 'file '.$file.' has unexpected size - expected: '.($this->stringOffset + $this->stringSize).' has: '.$this->filesize;
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$this->close();
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return;
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}
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}
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public function readRecord(string $colFmt = "V*") : array
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{
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return unpack($colFmt, $this->read($this->recordSize));
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}
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public function readString() : ?string
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{
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$x = $this->readUInt32();
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if (is_null($x))
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return null;
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return $this->getStringFromBlock($x->unpack());
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}
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public function getStringFromBlock(int $offset) : ?string
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{
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$curPos = $this->tell();
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$this->seek($this->stringOffset + $offset);
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// apparently it is more efficient to read more than one byte at once..?
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$str = '';
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while (($pos = strpos($str, "\0")) === false)
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$str .= $this->read(255);
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$str = substr($str, 0, $pos);
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$this->seek($curPos);
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return $pos ? $str : null;
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}
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}
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?>
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