From 9aa4b91cbac1a60d1e4ddef407eff7f309470f62 Mon Sep 17 00:00:00 2001
From: gitsrc <admin@icorer.com>
Date: Tue, 16 Oct 2018 22:47:22 +0800
Subject: [PATCH] fix: hexdec conversion exception for negative hex

---
 src/Jaeger/Propagator/JaegerPropagator.php |  4 +--
 src/Jaeger/SpanContext.php                 | 30 +++++++++++++++++-----
 2 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/src/Jaeger/Propagator/JaegerPropagator.php b/src/Jaeger/Propagator/JaegerPropagator.php
index 35a052a..fcf9de3 100644
--- a/src/Jaeger/Propagator/JaegerPropagator.php
+++ b/src/Jaeger/Propagator/JaegerPropagator.php
@@ -30,8 +30,8 @@ public function extract($format, $carrier){
             if($k == Constants\Tracer_State_Header_Name){
                 list($traceId, $spanId, $parentId,$flags) = explode(':', $carrier[strtoupper($k)]);
 
-                $spanContext->spanId = hexdec($spanId);
-                $spanContext->parentId = hexdec($parentId);
+                $spanContext->spanId = $spanContext->hexToSignedInt($spanId);
+                $spanContext->parentId = $spanContext->hexToSignedInt($parentId);
                 $spanContext->flags = $flags;
                 $spanContext->traceIdToString($traceId);
 
diff --git a/src/Jaeger/SpanContext.php b/src/Jaeger/SpanContext.php
index 17c4be8..38e1884 100644
--- a/src/Jaeger/SpanContext.php
+++ b/src/Jaeger/SpanContext.php
@@ -94,13 +94,31 @@ public function isSampled(){
     }
 
 
-    public function traceIdToString($traceId){
+    public function hexToSignedInt($hex)
+    {
+        $hexToDecNum = hexdec($hex);
+        if (gettype($hexToDecNum) === "integer"){
+            return $hexToDecNum;
+        }
+        $dec = 0;
+        $len = strlen($hex);
+        for ($i = 1; $i <= $len; $i++) {
+            $dec = bcadd($dec, bcmul(strval(hexdec($hex[$i - 1])), bcpow('16', strval($len - $i))));
+        }
+        $bigUnsignedNumStr = $dec;
+        $bigsub = bcsub($bigUnsignedNumStr, bcadd(PHP_INT_MAX . '', 1));
+        $bigAdd = bcadd($bigsub, PHP_INT_MIN . '');
+        return intval($bigAdd);
+    }
+
+    public function traceIdToString($traceId)
+    {
         $len = strlen($traceId);
-        if($len > 16){
-            $this->traceIdHigh = hexdec(substr($traceId, 0, 16));
-            $this->traceIdLow = hexdec(substr($traceId, 16));
-        }else{
-            $this->traceIdLow = hexdec($traceId);
+        if ($len > 16) {
+            $this->traceIdHigh = $this->hexToSignedInt(substr($traceId, 0, 16));
+            $this->traceIdLow = $this->hexToSignedInt(substr($traceId, 16));
+        } else {
+            $this->traceIdLow = $this->hexToSignedInt($traceId);
         }
     }