fix: (decoder) return io.EOF when read nothing from io.Reader (#254)

* fix: (decoder) return io.EOF when read nothing from io.Reader

* build:(CI) codeql-analysis only use x86 machine

.github/workflows/codeql-analysis.yml

@@ -23,7 +23,7 @@ on:
 jobs:
   analyze:
     name: Analyze
-    runs-on: self-hosted
+    runs-on: [self-hosted, X64]
     permissions:
       actions: read
       contents: read

decoder/stream.go

@@ -80,6 +80,9 @@ read_more:
         if err != nil {
             repeat = false
             if err == io.EOF {
+                if len(buf) == 0 {
+                    return err
+                }
                 break
             }
             self.err = err

decoder/stream_test.go

@@ -35,6 +35,20 @@ var (
     strings.Repeat("2",1024)+`"} b {}`
 )
 
+func TestDecodeEmpty(t *testing.T) {
+    var str = ``
+    var r1 = strings.NewReader(str)
+    var v1 interface{}
+    var d1 = json.NewDecoder(r1)
+    var r2 = strings.NewReader(str)
+    var v2 interface{}
+    var d2 = NewStreamDecoder(r2)
+    es1 := d1.Decode(&v1)
+    ee1 := d2.Decode(&v2)
+    assert.Equal(t, es1, ee1)
+    assert.Equal(t, v1, v2)
+}
+
 func TestDecodeSingle(t *testing.T) {
     var str = _Single_JSON