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decode_test.go
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package bert
import (
"bytes"
"reflect"
"testing"
"fmt"
)
func ExampleDecode() {
i, err := Decode([]byte{131, 97, 42})
if err != nil {
fmt.Println(err)
}
fmt.Printf("%#v\n", i)
s, err := Decode([]byte{131, 107, 0, 3, 102, 111, 111})
if err != nil {
fmt.Println(err)
}
fmt.Printf("%#v\n", s)
a, err := Decode([]byte{131, 104, 1, 100, 0, 3, 102, 111, 111})
if err != nil {
fmt.Println(err)
}
fmt.Printf("%#v\n", a)
// Output:
// 42
// "foo"
// []bert.Term{"foo"}
}
func TestDecode(t *testing.T) {
// Small Integer
assertDecode(t, []byte{131, 97, 1}, 1)
assertDecode(t, []byte{131, 97, 2}, 2)
assertDecode(t, []byte{131, 97, 3}, 3)
assertDecode(t, []byte{131, 97, 4}, 4)
assertDecode(t, []byte{131, 97, 42}, 42)
// Integer
assertDecode(t, []byte{131, 98, 0, 0, 1, 1}, 257)
assertDecode(t, []byte{131, 98, 0, 0, 4, 1}, 1025)
assertDecode(t, []byte{131, 98, 255, 255, 255, 255}, -1)
assertDecode(t, []byte{131, 98, 255, 255, 255, 248}, -8)
assertDecode(t, []byte{131, 98, 0, 0, 19, 136}, 5000)
assertDecode(t, []byte{131, 98, 255, 255, 236, 120}, -5000)
// Small Bignum
// assertDecode(t, []byte{131, 110, 4, 0, 177, 104, 222, 58},
// 987654321);
// assertDecode(t, []byte{131, 110, 4, 1, 177, 104, 222, 58},
// -987654321);
// Large Bignum
// Float
assertDecode(t, []byte{131, 99, 53, 46, 48, 48, 48, 48, 48, 48, 48,
48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 101, 45,
48, 49, 0, 0, 0, 0, 0,
},
float32(0.5))
assertDecode(t, []byte{131, 99, 51, 46, 49, 52, 49, 53, 56,
57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 56, 56, 50, 54, 50,
101, 43, 48, 48, 0, 0, 0, 0, 0,
},
float32(3.14159))
assertDecode(t, []byte{131, 99, 45, 51, 46, 49, 52, 49, 53,
56, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 56, 56, 50, 54,
50, 101, 43, 48, 48, 0, 0, 0, 0,
},
float32(-3.14159))
assertDecode(t, []byte{131, 99, 51, 46, 49, 52, 49, 53, 57,
48, 49, 49, 56, 52, 48, 56, 50, 48, 51, 49, 50, 53, 48, 48,
101, 43, 48, 48, 0, 0, 0, 0, 0,
},
float32(3.14159))
assertDecode(t, []byte{131, 99, 45, 51, 46, 49, 52, 49, 53,
57, 48, 49, 49, 56, 52, 48, 56, 50, 48, 51, 49, 50, 53, 48,
48, 101, 43, 48, 48, 0, 0, 0, 0,
},
float32(-3.14159))
// Atom
assertDecode(t, []byte{131, 100, 0, 3, 102, 111, 111},
Atom("foo"))
assertDecode(t, []byte{131, 100, 0, 5, 104, 101, 108, 108, 111},
Atom("hello"))
// Small Tuple
assertDecode(t, []byte{131, 104, 0}, []Term{})
assertDecode(t, []byte{131, 104, 1,
100, 0, 3, 102, 111, 111,
},
[]Term{Atom("foo")})
assertDecode(t, []byte{131, 104, 2,
100, 0, 3, 102, 111, 111,
100, 0, 3, 98, 97, 114,
},
[]Term{Atom("foo"), Atom("bar")})
assertDecode(t, []byte{131, 104, 3,
100, 0, 5, 99, 111, 111, 114, 100,
97, 23,
97, 42,
},
[]Term{Atom("coord"), 23, 42})
assertDecode(t, []byte{131, 104, 4,
100, 0, 4, 99, 97, 108, 108,
100, 0, 6, 112, 104, 111, 116, 111, 120,
100, 0, 8, 105, 109, 103, 95, 115, 105, 122, 101,
108, 0, 0, 0, 1, 97, 99,
106,
},
[]Term{Atom("call"), Atom("photox"), Atom("img_size"), []Term{99}})
// Large Tuple
// String
assertDecode(t, []byte{131, 107, 0, 3, 102, 111, 111}, "foo")
assertDecode(t, []byte{131, 107, 0, 1, 0}, "\000")
assertDecode(t, []byte{131, 107, 0, 1, 1}, "\001")
// List
assertDecode(t, []byte{131, 106}, []Term{})
assertDecode(t, []byte{131, 108, 0, 0, 0, 1, 97, 1, 106},
[]Term{1})
assertDecode(t, []byte{131, 108, 0, 0, 0, 1, 98, 0, 0, 1, 0, 106},
[]Term{256})
assertDecode(t, []byte{131, 108, 0, 0, 0, 1, 107, 0, 1, 97, 106},
[]Term{"a"})
assertDecode(t, []byte{131, 108, 0, 0, 0, 1, 100, 0, 1, 97, 106},
[]Term{Atom("a")})
assertDecode(t, []byte{131, 108, 0, 0, 0, 3,
97, 1, 97, 2, 97, 3,
106,
},
[]Term{1, 2, 3})
assertDecode(t, []byte{131, 108, 0, 0, 0, 2,
107, 0, 1, 97, 107, 0, 1, 98, 106,
},
[]Term{"a", "b"})
assertDecode(t, []byte{131, 108, 0, 0, 0, 1, 107, 0, 2, 97, 98, 106},
[]Term{"ab"})
assertDecode(t, []byte{131, 108, 0, 0, 0, 2,
100, 0, 1, 97, 100, 0, 1, 98, 106,
},
[]Term{Atom("a"), Atom("b")})
assertDecode(t, []byte{131, 108, 0, 0, 0, 2, 100, 0, 1, 97, 97, 1, 106},
[]Term{Atom("a"), 1})
assertDecode(t, []byte{131, 108, 0, 0, 0, 2,
107, 0, 1, 97, 107, 0, 2, 1, 2, 106,
},
[]Term{"a", "\001\002"})
assertDecode(t, []byte{131, 108, 0, 0, 0, 2,
100, 0, 1, 97, 107, 0, 2, 1, 2, 106,
},
[]Term{Atom("a"), "\001\002"})
assertDecode(t, []byte{131, 108, 0, 0, 0, 2, 100, 0, 1, 97, 108, 0, 0, 0, 1, 98, 0, 0, 1, 0, 106,
106,
},
[]Term{Atom("a"), []Term{256}})
// Binary
assertDecode(t, []byte{131, 109, 0, 0, 0, 3, 102, 111, 111},
[]uint8{102, 111, 111})
assertDecode(t, []byte{131, 109, 0, 0, 0, 5, 104, 101, 108, 108, 111},
[]uint8{104, 101, 108, 108, 111})
// Complex
assertDecode(t, []byte{131, 104, 2, 100, 0, 4, 98, 101, 114, 116, 100, 0, 3, 110, 105, 108}, nil)
assertDecode(t, []byte{131, 104, 2, 100, 0, 4, 98, 101, 114, 116, 100, 0, 4, 116, 114, 117, 101}, true)
assertDecode(t, []byte{131, 104, 2, 100, 0, 4, 98, 101, 114, 116, 100, 0, 5, 102, 97, 108, 115, 101}, false)
assertDecode(t, []byte{131, 104, 4,
100, 0, 4, 99, 97, 108, 108,
100, 0, 6, 112, 104, 111, 116, 111, 120,
100, 0, 8, 105, 109, 103, 95, 115, 105, 122, 101,
108, 0, 0, 0, 1, 97, 99,
106,
},
[]Term{Atom("call"), Atom("photox"), Atom("img_size"), []Term{99}})
}
func assertDecode(t *testing.T, data []byte, expected interface{}) {
val, err := Decode(data)
if err != nil {
t.Errorf("Decode(%v) returned error '%v'", data, err)
} else if !reflect.DeepEqual(val, expected) {
t.Errorf("Decode(%v) = %#v, expected %#v", data, val, expected)
}
}
func TestUnmarshal(t *testing.T) {
var a struct {
First Atom
}
Unmarshal([]byte{131, 104, 1, 100, 0, 3, 102, 111, 111}, &a)
assertEqual(t, Atom("foo"), a.First)
var b struct {
First int
}
Unmarshal([]byte{131, 104, 1, 97, 42}, &b)
assertEqual(t, 42, b.First)
var c struct {
First Atom
Second Atom
}
Unmarshal([]byte{131, 104, 2, 100, 0, 3, 102, 111, 111, 100, 0, 3, 98, 97, 114}, &c)
assertEqual(t, Atom("foo"), c.First)
assertEqual(t, Atom("bar"), c.Second)
var req Request
Unmarshal([]byte{131, 104, 4,
100, 0, 4, 99, 97, 108, 108,
100, 0, 6, 112, 104, 111, 116, 111, 120,
100, 0, 8, 105, 109, 103, 95, 115, 105, 122, 101,
108, 0, 0, 0, 1, 97, 99,
106,
},
&req)
assertEqual(t, Atom("call"), req.Kind)
assertEqual(t, Atom("photox"), req.Module)
assertEqual(t, Atom("img_size"), req.Function)
assertEqual(t, []Term{99}, req.Arguments)
}
func TestUnmarshalRequest(t *testing.T) {
buf := bytes.NewBuffer([]byte{
0, 0, 0, 38,
131, 104, 4,
100, 0, 4, 99, 97, 108, 108,
100, 0, 6, 112, 104, 111, 116, 111, 120,
100, 0, 8, 105, 109, 103, 95, 115, 105, 122, 101,
108, 0, 0, 0, 1, 97, 99,
106,
})
req, _ := UnmarshalRequest(buf)
assertEqual(t, Atom("call"), req.Kind)
assertEqual(t, Atom("photox"), req.Module)
assertEqual(t, Atom("img_size"), req.Function)
assertEqual(t, []Term{99}, req.Arguments)
}
func assertEqual(t *testing.T, expected interface{}, actual interface{}) {
if !reflect.DeepEqual(expected, actual) {
t.Errorf("expected %v, but was %v", expected, actual)
}
}