forked from mystiq/dex
159 lines
3.4 KiB
Go
159 lines
3.4 KiB
Go
package ber
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import (
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"bytes"
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"io"
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"math"
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"testing"
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)
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func TestReadLength(t *testing.T) {
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testcases := map[string]struct {
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Data []byte
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ExpectedLength int
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ExpectedBytesRead int
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ExpectedError string
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}{
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"empty": {
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Data: []byte{},
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ExpectedBytesRead: 0,
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ExpectedError: io.ErrUnexpectedEOF.Error(),
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},
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"invalid first byte": {
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Data: []byte{0xFF},
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ExpectedBytesRead: 1,
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ExpectedError: "invalid length byte 0xff",
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},
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"indefinite form": {
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Data: []byte{LengthLongFormBitmask},
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ExpectedLength: LengthIndefinite,
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ExpectedBytesRead: 1,
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},
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"short-definite-form zero length": {
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Data: []byte{0},
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ExpectedLength: 0,
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ExpectedBytesRead: 1,
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},
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"short-definite-form length 1": {
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Data: []byte{1},
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ExpectedLength: 1,
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ExpectedBytesRead: 1,
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},
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"short-definite-form max length": {
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Data: []byte{127},
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ExpectedLength: 127,
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ExpectedBytesRead: 1,
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},
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"long-definite-form missing bytes": {
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Data: []byte{LengthLongFormBitmask | 1},
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ExpectedBytesRead: 1,
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ExpectedError: io.ErrUnexpectedEOF.Error(),
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},
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"long-definite-form overflow": {
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Data: []byte{LengthLongFormBitmask | 9},
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ExpectedBytesRead: 1,
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ExpectedError: "long-form length overflow",
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},
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"long-definite-form zero length": {
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Data: []byte{LengthLongFormBitmask | 1, 0x0},
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ExpectedLength: 0,
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ExpectedBytesRead: 2,
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},
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"long-definite-form length 127": {
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Data: []byte{LengthLongFormBitmask | 1, 127},
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ExpectedLength: 127,
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ExpectedBytesRead: 2,
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},
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"long-definite-form max length": {
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Data: []byte{
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LengthLongFormBitmask | 8,
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0x7F,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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},
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ExpectedLength: math.MaxInt64,
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ExpectedBytesRead: 9,
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},
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}
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for k, tc := range testcases {
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reader := bytes.NewBuffer(tc.Data)
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length, read, err := readLength(reader)
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if err != nil {
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if tc.ExpectedError == "" {
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t.Errorf("%s: unexpected error: %v", k, err)
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} else if err.Error() != tc.ExpectedError {
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t.Errorf("%s: expected error %v, got %v", k, tc.ExpectedError, err)
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}
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} else if tc.ExpectedError != "" {
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t.Errorf("%s: expected error %v, got none", k, tc.ExpectedError)
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continue
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}
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if read != tc.ExpectedBytesRead {
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t.Errorf("%s: expected read %d, got %d", k, tc.ExpectedBytesRead, read)
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}
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if length != tc.ExpectedLength {
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t.Errorf("%s: expected length %d, got %d", k, tc.ExpectedLength, length)
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}
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}
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}
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func TestEncodeLength(t *testing.T) {
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testcases := map[string]struct {
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Length int
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ExpectedBytes []byte
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}{
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"0": {
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Length: 0,
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ExpectedBytes: []byte{0},
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},
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"1": {
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Length: 1,
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ExpectedBytes: []byte{1},
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},
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"max short-form length": {
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Length: 127,
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ExpectedBytes: []byte{127},
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},
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"min long-form length": {
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Length: 128,
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ExpectedBytes: []byte{LengthLongFormBitmask | 1, 128},
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},
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"max long-form length": {
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Length: math.MaxInt64,
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ExpectedBytes: []byte{
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LengthLongFormBitmask | 8,
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0x7F,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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},
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},
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}
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for k, tc := range testcases {
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b := encodeLength(tc.Length)
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if bytes.Compare(tc.ExpectedBytes, b) != 0 {
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t.Errorf("%s: Expected\n\t%#v\ngot\n\t%#v", k, tc.ExpectedBytes, b)
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}
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}
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}
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