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<?php
namespace Jaeger\Codec;
class CodecUtility
{
/**
* Incoming trace/span IDs are hex representations of 64-bit values. PHP
* represents ints internally as signed 32- or 64-bit values, but base_convert
* converts to string representations of arbitrarily large positive numbers.
* This means at least half the incoming IDs will be larger than PHP_INT_MAX.
*
* Thrift, while building a binary representation of the IDs, performs bitwise
* operations on the string values, implicitly casting to int and capping them
* at PHP_INT_MAX. So, incoming IDs larger than PHP_INT_MAX will be serialized
* and sent to the agent as PHP_INT_MAX, breaking trace/span correlation.
*
* This method therefore, on 64-bit architectures, splits the hex string into
* high and low values, converts them separately to ints, and manually combines
* them into a proper signed int. This int is then handled properly by the
* Thrift package.
*
* On 32-bit architectures, it falls back to base_convert.
*
* @param string $hex
* @return string|int
*/
public static function hexToInt64($hex)
{
// If we're on a 32-bit architecture, fall back to base_convert.
if (PHP_INT_SIZE === 4) {
return base_convert($hex, 16, 10);
}
$hi = intval(substr($hex, -16, -8), 16);
$lo = intval(substr($hex, -8, 8), 16);
return $hi << 32 | $lo;
}
}
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