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utils.go
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package rtfconverter
import (
"regexp"
"errors"
"golang.org/x/text/encoding"
"golang.org/x/text/encoding/charmap"
"golang.org/x/text/encoding/japanese"
"golang.org/x/text/encoding/simplifiedchinese"
"golang.org/x/text/encoding/korean"
"golang.org/x/text/encoding/traditionalchinese"
)
// check if a byte is lower letter to check if it is part of a control word
func ByteIsAsciiLetter(b byte) bool {
isLetter, _ := regexp.MatchString(`[A-Za-z]{1}`, string(b));
return isLetter
}
func ByteIsDigit(b byte) bool {
isDigit, _ := regexp.MatchString(`[0-9]{1}`, string(b));
return isDigit
}
func ByteIsHexDigit(b byte) bool {
isDigit, _ := regexp.MatchString(`[A-Za-z0-9]{1}`, string(b));
return isDigit
}
var rtfEncodeCodePageMap map[string]string = map[string]string{
"ansi" : "CP1252",
"mac" : "MAC",
"pc" : "CP437",
"pca" : "CP850",
"437" : "CP437", // United States IBM
"708" : "ASMO-708", // also [ISO-8859-6][ARABIC] Arabic
/* Not supported by iconv
709, : "" // Arabic (ASMO 449+, BCON V4)
710, : "" // Arabic (transparent Arabic)
711, : "" // Arabic (Nafitha Enhanced)
720, : "" // Arabic (transparent ASMO)
*/
"819" : "CP819", // Windows 3.1 (US and Western Europe)
"850" : "CP850", // IBM multilingual
"852" : "CP852", // Eastern European
"860" : "CP860", // Portuguese
"862" : "CP862", // Hebrew
"863" : "CP863", // French Canadian
"864" : "CP864", // Arabic
"865" : "CP865", // Norwegian
"866" : "CP866", // Soviet Union
"874" : "CP874", // Thai
"932" : "CP932", // Japanese
"936" : "CP936", // Simplified Chinese
"949" : "CP949", // Korean
"950" : "CP950", // Traditional Chinese
"1250" : "CP1250", // Windows 3.1 (Eastern European)
"1251" : "CP1251", // Windows 3.1 (Cyrillic)
"1252" : "CP1252", // Western European
"1253" : "CP1253", // Greek
"1254" : "CP1254", // Turkish
"1255" : "CP1255", // Hebrew
"1256" : "CP1256", // Arabic
"1257" : "CP1257", // Baltic
"1258" : "CP1258", // Vietnamese
"1361" : "CP1361", // Johab
}
func GetEncodingFromCodepage(code string) (string, error) {
if val, ok := rtfEncodeCodePageMap[code]; ok {
return val, nil
}
return "", errors.New("Encoding Code Page not found")
}
var rtfEncodingCharsetMap map[int]string = map[int]string {
0 : "CP1252", // ANSI: Western Europe
1 : "CP1252", //*Default
2 : "CP1252", //*Symbol
3 : "", // Invalid
77 : "MAC", //*also [MacRoman]: Macintosh
128 : "CP932", //*or [Shift_JIS]?: Japanese
129 : "CP949", //*also [UHC]: Korean (Hangul)
130 : "CP1361", //*also [JOHAB]: Korean (Johab)
134 : "CP936", //*or [GB2312]?: Simplified Chinese
136 : "CP950", //*or [BIG5]?: Traditional Chinese
161 : "CP1253", // Greek
162 : "CP1254", // Turkish (latin 5)
163 : "CP1258", // Vietnamese
177 : "CP1255", // Hebrew
178 : "CP1256", // Simplified Arabic
179 : "CP1256", //*Traditional Arabic
180 : "CP1256", //*Arabic User
181 : "CP1255", //*Hebrew User
186 : "CP1257", // Baltic
204 : "CP1251", // Russian (Cyrillic)
222 : "CP874", // Thai
238 : "CP1250", // Eastern European (latin 2)
254 : "CP437", //*also [IBM437][437]: PC437
255 : "CP437", //*OEM still PC437
}
func GetEncodingFromCharset(code int) (string, error) {
if val, ok := rtfEncodingCharsetMap[code]; ok {
return val, nil
}
return "", errors.New("Encoding Code Page not found")
}
var rtfHighlightMap map[int]string = map[int]string {
1 : "Black",
2 : "Blue",
3 : "Cyan",
4 : "Green",
5 : "Magenta",
6 : "Red",
7 : "Yellow",
8 : "Unused",
9 : "DarkBlue",
10 : "DarkCyan",
11 : "DarkGreen",
12 : "DarkMagenta",
13 : "DarkRed",
14 : "DarkYellow",
15 : "DarkGray",
16 : "LightGray",
}
func ConvertToUtf8(b []byte, srcEncoding string) ([]byte, error) {
var (
result []byte
err error
dec *encoding.Decoder
)
//fmt.Println("Decoding: ", string(b))
switch (srcEncoding) {
case "MAC": // [MacRoman]: Macintosh
dec = charmap.Macintosh.NewDecoder()
case "CP437": // United States IBM
dec = charmap.CodePage437.NewDecoder()
case "ASMO-708": // also [ISO-8859-6][ARABIC] Arabic
dec = charmap.ISO8859_6.NewDecoder()
case "CP819": // Windows 3.1 (US and Western Europe)
dec = charmap.ISO8859_1.NewDecoder()
case "CP850": // IBM multilingual
dec = charmap.CodePage850.NewDecoder()
case "CP852": // Eastern European
dec = charmap.CodePage852.NewDecoder()
case "CP860": // Portuguese
dec = charmap.CodePage860.NewDecoder()
case "CP862": // Hebrew
dec = charmap.CodePage862.NewDecoder()
case "CP863": // French Canadian
dec = charmap.CodePage863.NewDecoder()
case "CP864": // Arabic
case "CP865": // Norwegian
dec = charmap.CodePage865.NewDecoder()
case "CP866": // Soviet Union
dec = charmap.CodePage866.NewDecoder()
case "CP874": // Thai
dec = charmap.Windows874.NewDecoder()
case "CP932": // Japanese
dec = japanese.ShiftJIS.NewDecoder()
case "CP936": // Simplified Chinese
dec = simplifiedchinese.GBK.NewDecoder()
case "CP949": // Korean
dec = korean.EUCKR.NewDecoder();
case "CP950": // Traditional Chinese
dec = traditionalchinese.Big5.NewDecoder();
case "CP1250": // Windows 3.1 (Eastern European)
dec = charmap.Windows1250.NewDecoder()
case "CP1251": // Windows 3.1 (Cyrillic)
dec = charmap.Windows1251.NewDecoder()
case "CP1252": // Western European
dec = charmap.Windows1252.NewDecoder()
case "CP1253": // Greek
dec = charmap.Windows1253.NewDecoder()
case "CP1254": // Turkish
dec = charmap.Windows1254.NewDecoder()
case "CP1255": // Hebrew
dec = charmap.Windows1255.NewDecoder()
case "CP1256": // Arabic
dec = charmap.Windows1256.NewDecoder()
case "CP1257": // Baltic
dec = charmap.Windows1257.NewDecoder()
case "CP1258": // Vietnamese
dec = charmap.Windows1258.NewDecoder()
case "CP1361": // Johab
dec = korean.EUCKR.NewDecoder()
}
if dec != nil {
result, err = dec.Bytes(b)
} else {
result = b[0:]
}
return result, err
}