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