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29 lines
749 B
29 lines
749 B
2 years ago
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<?php
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namespace MaxMind\Db\Reader;
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use MaxMind\Db\Reader\InvalidDatabaseException;
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class Util
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{
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public static function read($stream, $offset, $numberOfBytes)
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{
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if ($numberOfBytes == 0) {
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return '';
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}
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if (fseek($stream, $offset) == 0) {
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$value = fread($stream, $numberOfBytes);
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// We check that the number of bytes read is equal to the number
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// asked for. We use ftell as getting the length of $value is
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// much slower.
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if (ftell($stream) - $offset === $numberOfBytes) {
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return $value;
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}
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}
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throw new InvalidDatabaseException(
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"The MaxMind DB file contains bad data"
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);
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}
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}
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