fix: log cmpp packet decode failures

gateway/third_party/gocmpp/utils/utils.go

@@ -0,0 +1,105 @@
+// Copyright 2015 Tony Bai.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cmpputils
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"strings"
+	"unicode/utf8"
+	"unsafe"
+
+	"golang.org/x/text/encoding/simplifiedchinese"
+	"golang.org/x/text/encoding/unicode"
+	"golang.org/x/text/transform"
+)
+
+var ErrInvalidUtf8Rune = errors.New("Not Invalid Utf8 runes")
+
+func IsBigEndian() bool {
+	var i uint16 = 0x1234
+	var p *[2]byte = (*[2]byte)(unsafe.Pointer(&i))
+	if (*p)[0] == 0x12 {
+		return true
+	}
+	return false
+}
+
+// TimeStamp2Str converts a timestamp(MMDDHHMMSS) int to a string(10 bytes).
+func TimeStamp2Str(t uint32) string {
+	return fmt.Sprintf("%010d", t)
+}
+
+func Utf8ToUcs2(in string) (string, error) {
+	if !utf8.ValidString(in) {
+		return "", ErrInvalidUtf8Rune
+	}
+
+	r := bytes.NewReader([]byte(in))
+	t := transform.NewReader(r, unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM).NewEncoder()) //UTF-16 bigendian, no-bom
+	out, err := ioutil.ReadAll(t)
+	if err != nil {
+		return "", err
+	}
+	return string(out), nil
+}
+
+func Ucs2ToUtf8(in string) (string, error) {
+	r := bytes.NewReader([]byte(in))
+	t := transform.NewReader(r, unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM).NewDecoder()) //UTF-16 bigendian, no-bom
+	out, err := ioutil.ReadAll(t)
+	if err != nil {
+		return "", err
+	}
+	return string(out), nil
+}
+
+func Utf8ToGB18030(in string) (string, error) {
+	if !utf8.ValidString(in) {
+		return "", ErrInvalidUtf8Rune
+	}
+
+	r := bytes.NewReader([]byte(in))
+	t := transform.NewReader(r, simplifiedchinese.GB18030.NewEncoder())
+	out, err := ioutil.ReadAll(t)
+	if err != nil {
+		return "", err
+	}
+	return string(out), nil
+}
+
+func GB18030ToUtf8(in string) (string, error) {
+	r := bytes.NewReader([]byte(in))
+	t := transform.NewReader(r, simplifiedchinese.GB18030.NewDecoder())
+	out, err := ioutil.ReadAll(t)
+	if err != nil {
+		return "", err
+	}
+	return string(out), nil
+}
+
+func OctetString(s string, fixedLength int) string {
+	length := len(s)
+	if length == fixedLength {
+		return s
+	}
+
+	if length > fixedLength {
+		return s[length-fixedLength:]
+	}
+
+	return strings.Join([]string{s, string(make([]byte, fixedLength-length))}, "")
+}