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iconv.go
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iconv.go
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package better
import (
"encoding/binary"
"encoding/gob"
"errors"
"fmt"
"os"
"path"
"runtime"
"unsafe"
)
type CODING_IDX int
const (
GBK2312_UNICODE_IDX = iota
GBK18030_UNICODE_IDX = iota
GBK_UNICODE_IDX = iota
UNICODE_GBK_IDX = iota
UNICODE_GBK2312_IDX = iota
UNICODE_GBK18030_IDX = iota
UTF8_UTF16_LE_IDX = iota
UTF16_LE_UTF8_IDX = iota
UTF8_UTF16_BE_IDX = iota
UTF16_BE_UTF8_IDX = iota
UTF8_GBK_IDX = iota
UTF8_GBK2312_IDX = iota
UTF8_GBK18030_IDX = iota
GBK_UTF8_IDX = iota
GBK2312_UTF8_IDX = iota
GBK18030_UTF8_IDX = iota
)
type eleMent struct {
filename string
fn func(map[uint64]uint64, []byte, []byte) (int, error)
}
var g_CodeMap = map[CODING_IDX]*eleMent{
GBK18030_UNICODE_IDX: &eleMent{"Gbk2Unicode.db", convertGBKToUNICODE},
GBK2312_UNICODE_IDX: &eleMent{"Gbk2Unicode.db", convertGBKToUNICODE},
GBK_UNICODE_IDX: &eleMent{"Gbk2Unicode.db", convertGBKToUNICODE},
UNICODE_GBK_IDX: &eleMent{"Unicode2Gbk.db", convertUNICODEToGBK},
UNICODE_GBK2312_IDX: &eleMent{"Unicode2Gbk.db", convertUNICODEToGBK},
UNICODE_GBK18030_IDX: &eleMent{"Unicode2Gbk.db", convertUNICODEToGBK},
GBK18030_UTF8_IDX: &eleMent{"Gbk2Unicode.db", convertGBKToUTF8},
GBK2312_UTF8_IDX: &eleMent{"Gbk2Unicode.db", convertGBKToUTF8},
GBK_UTF8_IDX: &eleMent{"Gbk2Unicode.db", convertGBKToUTF8},
UTF8_GBK_IDX: &eleMent{"Unicode2Gbk.db", convertUTF8ToGBK},
UTF8_GBK18030_IDX: &eleMent{"Unicode2Gbk.db", convertUTF8ToGBK},
UTF8_GBK2312_IDX: &eleMent{"Unicode2Gbk.db", convertUTF8ToGBK},
UTF8_UTF16_LE_IDX: &eleMent{"nil", convertUTF8ToUTF16LE},
UTF16_LE_UTF8_IDX: &eleMent{"nil", convertUTF16LEToUTF8},
UTF8_UTF16_BE_IDX: &eleMent{"nil", convertUTF8ToUTF16BE},
UTF16_BE_UTF8_IDX: &eleMent{"nil", convertUTF16BEToUTF8},
}
type Converter struct {
isOpen bool
codeMap map[uint64]uint64
// The first argument is input argument, that is to be translated.
// The second argument is output argument, this has been translated.
// The memory of the second argument should be enough big,and it should be allocated by the caller of the function
CodeConvertFunc func([]byte, []byte) (int, error)
}
func NewCoder(idx CODING_IDX) (*Converter, error) {
var ele *eleMent
ret := new(Converter)
if v, ok := g_CodeMap[idx]; ok {
ele = v
} else {
return nil, fmt.Errorf("Error: 未知编码格式\n")
}
if ele.filename != "nil" {
_, filename, _, _ := runtime.Caller(0)
ele.filename = path.Join(path.Dir(filename), ele.filename)
ret.CodeConvertFunc = func(in []byte, out []byte) (int, error) {
return ele.fn(ret.codeMap, in, out)
}
ret.isOpen = true
} else {
ret.CodeConvertFunc = func(in []byte, out []byte) (int, error) {
return ele.fn(ret.codeMap, in, out)
}
return ret, nil
}
rf, err := os.Open(ele.filename)
if err != nil {
return nil, err
}
defer rf.Close()
ret.codeMap = make(map[uint64]uint64)
gb := gob.NewDecoder(rf)
if err := gb.Decode(&ret.codeMap); err != nil {
return nil, err
}
return ret, nil
}
func isLittleEndian() bool {
var x int32 = 0x12345678
p := unsafe.Pointer(&x)
p1 := (*[4]byte)(p)
return p1[0] == 0x78
}
func convertGBKToUNICODE(tbl_map map[uint64]uint64, from []byte, to []byte) (int, error) {
j := 0
return j, nil
}
func convertUNICODEToGBK(tbl_map map[uint64]uint64, from []byte, to []byte) (int, error) {
j := 0
return j, nil
}
func convertUTF16LEToUTF8(tbl_map map[uint64]uint64, from []byte, to []byte) (int, error) {
i := 0
j := 0
var tmpUnicode uint64
fromLen := len(from)
if fromLen%2 != 0 {
return 0, fmt.Errorf("无效Unicode字符串")
}
if from[0] == 0xff {
i += 2
}
for i < fromLen {
tmpUnicode = uint64(binary.LittleEndian.Uint16(from[i:]))
switch {
case tmpUnicode < 0x00000080:
to[j] = byte(tmpUnicode)
j++
case tmpUnicode < 0x00000800:
to[j] = 0xc0 | byte((tmpUnicode>>6)&0x1f)
to[j+1] = 0x80 | byte(tmpUnicode&0x3f)
j += 2
case tmpUnicode < 0x00010000:
to[j] = 0xe0 | byte((tmpUnicode>>12)&0x0f)
to[j+1] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+2] = 0x80 | byte(tmpUnicode&0x3f)
j += 3
case tmpUnicode < 0x00200000:
to[j] = 0xf0 | byte((tmpUnicode>>18)&0x07)
to[j+1] = 0x80 | byte((tmpUnicode>>12)&0x3f)
to[j+2] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+3] = 0x80 | byte(tmpUnicode&0x3f)
j += 4
case tmpUnicode < 0x04000000:
to[j] = 0xf8 | byte((tmpUnicode>>24)&0x03)
to[j+1] = 0x80 | byte((tmpUnicode>>18)&0x3f)
to[j+2] = 0x80 | byte((tmpUnicode>>12)&0x3f)
to[j+3] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+4] = 0x80 | byte(tmpUnicode&0x3f)
j += 5
case tmpUnicode < 0x80000000:
to[j] = 0xfc | byte((tmpUnicode>>30)&0x01)
to[j+1] = 0x80 | byte((tmpUnicode>>24)&0x3f)
to[j+2] = 0x80 | byte((tmpUnicode>>18)&0x3f)
to[j+3] = 0x80 | byte((tmpUnicode>>12)&0x3f)
to[j+4] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+5] = 0x80 | byte(tmpUnicode&0x3f)
j += 6
default:
return 0, fmt.Errorf("非法字符[0x%x]", tmpUnicode)
}
i += 2
}
return j, nil
}
func convertUTF16BEToUTF8(tbl_map map[uint64]uint64, from []byte, to []byte) (int, error) {
i := 0
j := 0
var tmpUnicode uint64
fromLen := len(from)
if fromLen%2 != 0 {
return 0, fmt.Errorf("无效Unicode字符串")
}
if from[0] == 0xfe {
i += 2
}
for i < fromLen {
tmpUnicode = uint64(binary.BigEndian.Uint16(from[i:]))
switch {
case tmpUnicode < 0x00000080:
to[j] = byte(tmpUnicode)
j++
case tmpUnicode < 0x00000800:
to[j] = 0xc0 | byte((tmpUnicode>>6)&0x1f)
to[j+1] = 0x80 | byte(tmpUnicode&0x3f)
j += 2
case tmpUnicode < 0x00010000:
to[j] = 0xe0 | byte((tmpUnicode>>12)&0x0f)
to[j+1] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+2] = 0x80 | byte(tmpUnicode&0x3f)
j += 3
case tmpUnicode < 0x00200000:
to[j] = 0xf0 | byte((tmpUnicode>>18)&0x07)
to[j+1] = 0x80 | byte((tmpUnicode>>12)&0x3f)
to[j+2] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+3] = 0x80 | byte(tmpUnicode&0x3f)
j += 4
case tmpUnicode < 0x04000000:
to[j] = 0xf8 | byte((tmpUnicode>>24)&0x03)
to[j+1] = 0x80 | byte((tmpUnicode>>18)&0x3f)
to[j+2] = 0x80 | byte((tmpUnicode>>12)&0x3f)
to[j+3] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+4] = 0x80 | byte(tmpUnicode&0x3f)
j += 5
case tmpUnicode < 0x80000000:
to[j] = 0xfc | byte((tmpUnicode>>30)&0x01)
to[j+1] = 0x80 | byte((tmpUnicode>>24)&0x3f)
to[j+2] = 0x80 | byte((tmpUnicode>>18)&0x3f)
to[j+3] = 0x80 | byte((tmpUnicode>>12)&0x3f)
to[j+4] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+5] = 0x80 | byte(tmpUnicode&0x3f)
j += 6
default:
return 0, fmt.Errorf("非法字符[0x%x]", tmpUnicode)
}
i += 2
}
return j, nil
}
//将GBK编码转换为UTF-8编码
func convertGBKToUTF8(tbl_map map[uint64]uint64, from []byte, to []byte) (int, error) {
i := 0
var tmpGbk uint64
var tmpUnicode uint64
fromLen := len(from)
for i < fromLen {
if from[i]&0x80 == 0 { // ascii
i++
} else {
if from[i+1] > 0x39 || from[i+1] < 0x30 {
i += 2
} else {
i += 4
}
}
}
if i != fromLen {
return 0, errors.New("非法GBK编码")
}
i = 0
j := 0
for i < fromLen {
tmpGbk = 0x0
if from[i]&0x80 == 0 { // ascii
tmpGbk = uint64(from[i])
i++
} else {
if from[i+1] > 0x39 || from[i+1] < 0x30 {
tmpGbk = uint64(from[i+1])
tmpGbk |= uint64(from[i]) << 8
i += 2
} else {
tmpGbk = uint64(from[i+3])
tmpGbk |= uint64(from[i+2]) << 8
tmpGbk |= uint64(from[i+1]) << 16
tmpGbk |= uint64(from[i]) << 24
i += 4
}
}
if v, ok := tbl_map[tmpGbk]; ok {
tmpUnicode = v
} else {
return 0, fmt.Errorf("未找到对应字符[0x%x]", tmpGbk)
}
switch {
case tmpUnicode < 0x00000080:
to[j] = byte(tmpUnicode)
j++
case tmpUnicode < 0x00000800:
to[j] = 0xc0 | byte((tmpUnicode>>6)&0x1f)
to[j+1] = 0x80 | byte(tmpUnicode&0x3f)
j += 2
case tmpUnicode < 0x00010000:
to[j] = 0xe0 | byte((tmpUnicode>>12)&0x0f)
to[j+1] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+2] = 0x80 | byte(tmpUnicode&0x3f)
j += 3
case tmpUnicode < 0x00200000:
to[j] = 0xf0 | byte((tmpUnicode>>18)&0x07)
to[j+1] = 0x80 | byte((tmpUnicode>>12)&0x3f)
to[j+2] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+3] = 0x80 | byte(tmpUnicode&0x3f)
j += 4
case tmpUnicode < 0x04000000:
to[j] = 0xf8 | byte((tmpUnicode>>24)&0x03)
to[j+1] = 0x80 | byte((tmpUnicode>>18)&0x3f)
to[j+2] = 0x80 | byte((tmpUnicode>>12)&0x3f)
to[j+3] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+4] = 0x80 | byte(tmpUnicode&0x3f)
j += 5
case tmpUnicode < 0x80000000:
to[j] = 0xfc | byte((tmpUnicode>>30)&0x01)
to[j+1] = 0x80 | byte((tmpUnicode>>24)&0x3f)
to[j+2] = 0x80 | byte((tmpUnicode>>18)&0x3f)
to[j+3] = 0x80 | byte((tmpUnicode>>12)&0x3f)
to[j+4] = 0x80 | byte((tmpUnicode>>6)&0x3f)
to[j+5] = 0x80 | byte(tmpUnicode&0x3f)
j += 6
default:
return 0, fmt.Errorf("非法字符[0x%x]", tmpUnicode)
}
}
return j, nil
}
func convertUTF8ToUTF16LE(tbl_map map[uint64]uint64, from []byte, to []byte) (int, error) {
i := 0
j := 0
var tmpUnicode uint64
fromLen := len(from)
for i < fromLen {
switch {
case 0x80&from[i] == 0x0:
i++
case 0xe0&from[i] == 0xc0:
i += 2
case 0xf0&from[i] == 0xe0:
i += 3
case 0xf8&from[i] == 0xf0:
i += 4
case 0xfc&from[i] == 0xf8:
i += 5
case 0xfe&from[i] == 0xfc:
i += 6
default:
return 0, errors.New("无效UTF-8字符")
}
}
if i != fromLen {
return 0, errors.New("无效UTF-8字符串")
}
i = 0
// -------------------------------------
to[j] = 0xff
to[j+1] = 0xfe
j += 2
// -------------------------------------
for i < fromLen {
tmpUnicode = 0x00
switch {
case 0x80&from[i] == 0x00:
tmpUnicode = uint64(from[i])
i++
case 0xe0&from[i] == 0xc0:
tmpUnicode |= (uint64(from[i]&0x1f) << 6) | uint64(from[i+1]&0x3f)
i += 2
case 0xf0&from[i] == 0xe0:
tmpUnicode |= (uint64(from[i]&0x0f) << 12) | (uint64(from[i+1]&0x3f) << 6)
tmpUnicode |= uint64(from[i+2] & 0x3f)
i += 3
case 0xf8&from[i] == 0xf0:
tmpUnicode |= (uint64(from[i]&0x07) << 18) | (uint64(from[i+1]&0x3f) << 12)
tmpUnicode |= (uint64(from[i+2]&0x3f) << 6) | uint64(from[i+3]&0x3f)
i += 4
case 0xfc&from[i] == 0xf8:
tmpUnicode |= (uint64(from[i]&0x03) << 24) | (uint64(from[i+1]&0x3f) << 18)
tmpUnicode |= (uint64(from[i+2]&0x3f) << 12) | (uint64(from[i+3]&0x3f) << 6)
tmpUnicode |= uint64(from[i+4] & 0x3f)
i += 5
case 0xfe&from[i] == 0xfc:
tmpUnicode |= (uint64(from[i]&0x01) << 30) | (uint64(from[i+1]&0x3f) << 24)
tmpUnicode |= (uint64(from[i+2]&0x3f) << 18) | (uint64(from[i+3]&0x3f) << 12)
tmpUnicode |= (uint64(from[i+4]&0x3f) << 6) | uint64(from[i+5]&0x3f)
i += 6
default:
return 0, fmt.Errorf("无效UTF-8字符[0x%x]", from[i])
}
binary.LittleEndian.PutUint16(to[j:], uint16(tmpUnicode))
j += 2
}
return j, nil
}
func convertUTF8ToUTF16BE(tbl_map map[uint64]uint64, from []byte, to []byte) (int, error) {
i := 0
j := 0
var tmpUnicode uint64
fromLen := len(from)
for i < fromLen {
switch {
case 0x80&from[i] == 0x0:
i++
case 0xe0&from[i] == 0xc0:
i += 2
case 0xf0&from[i] == 0xe0:
i += 3
case 0xf8&from[i] == 0xf0:
i += 4
case 0xfc&from[i] == 0xf8:
i += 5
case 0xfe&from[i] == 0xfc:
i += 6
default:
return 0, errors.New("无效UTF-8字符")
}
}
if i != fromLen {
return 0, errors.New("无效UTF-8字符串")
}
i = 0
// -------------------------------------
to[j] = 0xfe
to[j+1] = 0xff
j += 2
// -------------------------------------
for i < fromLen {
tmpUnicode = 0x00
switch {
case 0x80&from[i] == 0x00:
tmpUnicode = uint64(from[i])
i++
case 0xe0&from[i] == 0xc0:
tmpUnicode |= (uint64(from[i]&0x1f) << 6) | uint64(from[i+1]&0x3f)
i += 2
case 0xf0&from[i] == 0xe0:
tmpUnicode |= (uint64(from[i]&0x0f) << 12) | (uint64(from[i+1]&0x3f) << 6)
tmpUnicode |= uint64(from[i+2] & 0x3f)
i += 3
case 0xf8&from[i] == 0xf0:
tmpUnicode |= (uint64(from[i]&0x07) << 18) | (uint64(from[i+1]&0x3f) << 12)
tmpUnicode |= (uint64(from[i+2]&0x3f) << 6) | uint64(from[i+3]&0x3f)
i += 4
case 0xfc&from[i] == 0xf8:
tmpUnicode |= (uint64(from[i]&0x03) << 24) | (uint64(from[i+1]&0x3f) << 18)
tmpUnicode |= (uint64(from[i+2]&0x3f) << 12) | (uint64(from[i+3]&0x3f) << 6)
tmpUnicode |= uint64(from[i+4] & 0x3f)
i += 5
case 0xfe&from[i] == 0xfc:
tmpUnicode |= (uint64(from[i]&0x01) << 30) | (uint64(from[i+1]&0x3f) << 24)
tmpUnicode |= (uint64(from[i+2]&0x3f) << 18) | (uint64(from[i+3]&0x3f) << 12)
tmpUnicode |= (uint64(from[i+4]&0x3f) << 6) | uint64(from[i+5]&0x3f)
i += 6
default:
return 0, fmt.Errorf("无效UTF-8字符[0x%x]", from[i])
}
binary.BigEndian.PutUint16(to[j:], uint16(tmpUnicode))
j += 2
}
return j, nil
}
//将UTF-8编码转换为GBK编码
func convertUTF8ToGBK(tbl_map map[uint64]uint64, from []byte, to []byte) (int, error) {
var tmpUnicode uint64
var tmpGbk uint64
i := 0
fromLen := len(from)
for i < fromLen {
switch {
case 0x80&from[i] == 0x0:
i++
case 0xe0&from[i] == 0xc0:
i += 2
case 0xf0&from[i] == 0xe0:
i += 3
case 0xf8&from[i] == 0xf0:
i += 4
case 0xfc&from[i] == 0xf8:
i += 5
case 0xfe&from[i] == 0xfc:
i += 6
default:
return 0, errors.New("无效UTF-8字符")
}
}
if i != fromLen {
return 0, errors.New("无效长度")
}
i = 0
j := 0
for i < fromLen {
tmpUnicode = 0x00
switch {
case 0x80&from[i] == 0x00:
tmpUnicode = uint64(from[i])
i++
case 0xe0&from[i] == 0xc0:
tmpUnicode |= (uint64(from[i]&0x1f) << 6) | uint64(from[i+1]&0x3f)
i += 2
case 0xf0&from[i] == 0xe0:
tmpUnicode |= (uint64(from[i]&0x0f) << 12) | (uint64(from[i+1]&0x3f) << 6)
tmpUnicode |= uint64(from[i+2] & 0x3f)
i += 3
case 0xf8&from[i] == 0xf0:
tmpUnicode |= (uint64(from[i]&0x07) << 18) | (uint64(from[i+1]&0x3f) << 12)
tmpUnicode |= (uint64(from[i+2]&0x3f) << 6) | uint64(from[i+3]&0x3f)
i += 4
case 0xfc&from[i] == 0xf8:
tmpUnicode |= (uint64(from[i]&0x03) << 24) | (uint64(from[i+1]&0x3f) << 18)
tmpUnicode |= (uint64(from[i+2]&0x3f) << 12) | (uint64(from[i+3]&0x3f) << 6)
tmpUnicode |= uint64(from[i+4] & 0x3f)
i += 5
case 0xfe&from[i] == 0xfc:
tmpUnicode |= (uint64(from[i]&0x01) << 30) | (uint64(from[i+1]&0x3f) << 24)
tmpUnicode |= (uint64(from[i+2]&0x3f) << 18) | (uint64(from[i+3]&0x3f) << 12)
tmpUnicode |= (uint64(from[i+4]&0x3f) << 6) | uint64(from[i+5]&0x3f)
i += 6
default:
return 0, fmt.Errorf("无效UTF-8字符[0x%x]", from[i])
}
if v, ok := tbl_map[tmpUnicode]; ok {
tmpGbk = v
} else {
return 0, fmt.Errorf("未找到对应字符[0x%x]", tmpUnicode)
}
switch {
case tmpGbk < 0x80:
to[j] = byte(tmpGbk)
j++
case tmpGbk < 0x10000:
to[j] = byte(tmpGbk >> 8)
to[j+1] = byte(tmpGbk)
j += 2
case tmpGbk < 0x100000000:
to[j] = byte(tmpGbk >> 24)
to[j+1] = byte(tmpGbk >> 16)
to[j+2] = byte(tmpGbk >> 8)
to[j+3] = byte(tmpGbk)
j += 4
default:
return 0, fmt.Errorf("非法对应字符[0x%x]", tmpGbk)
}
}
return j, nil
}