diff options
Diffstat (limited to 'vendor/github.com/mattermost/rsc/imap/decode.go')
| -rw-r--r-- | vendor/github.com/mattermost/rsc/imap/decode.go | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/vendor/github.com/mattermost/rsc/imap/decode.go b/vendor/github.com/mattermost/rsc/imap/decode.go deleted file mode 100644 index ebeb1d7d7..000000000 --- a/vendor/github.com/mattermost/rsc/imap/decode.go +++ /dev/null @@ -1,227 +0,0 @@ -package imap - -import ( - "bytes" - "encoding/base64" - "strings" - "unicode" -) - -func decode2047chunk(s string) (conv []byte, rest string, ok bool) { - // s is =?... - // and should be =?charset?e?text?= - j := strings.Index(s[2:], "?") - if j < 0 { - return - } - j += 2 - if j+2 >= len(s) || s[j+2] != '?' { - return - } - k := strings.Index(s[j+3:], "?=") - if k < 0 { - return - } - k += j + 3 - - charset, enc, text, rest := s[2:j], s[j+1], s[j+3:k], s[k+2:] - var encoding string - switch enc { - default: - return - case 'q', 'Q': - encoding = "quoted-printable" - case 'b', 'B': - encoding = "base64" - } - - dat := decodeText([]byte(text), encoding, charset, true) - if dat == nil { - return - } - return dat, rest, true -} - -func decodeQP(dat []byte, underscore bool) []byte { - out := make([]byte, len(dat)) - w := 0 - for i := 0; i < len(dat); i++ { - c := dat[i] - if underscore && c == '_' { - out[w] = ' ' - w++ - continue - } - if c == '\r' { - continue - } - if c == '=' { - if i+1 < len(dat) && dat[i+1] == '\n' { - i++ - continue - } - if i+2 < len(dat) && dat[i+1] == '\r' && dat[i+2] == '\n' { - i += 2 - continue - } - if i+2 < len(dat) { - v := unhex(dat[i+1])<<4 | unhex(dat[i+2]) - if v >= 0 { - out[w] = byte(v) - w++ - i += 2 - continue - } - } - } - out[w] = c - w++ - } - return out[:w] -} - -func nocrnl(dat []byte) []byte { - w := 0 - for _, c := range dat { - if c != '\r' && c != '\n' { - dat[w] = c - w++ - } - } - return dat[:w] -} - -func decode64(dat []byte) []byte { - out := make([]byte, len(dat)) - copy(out, dat) - out = nocrnl(out) - n, err := base64.StdEncoding.Decode(out, out) - if err != nil { - return nil - } - return out[:n] -} - -func decodeText(dat []byte, encoding, charset string, underscore bool) []byte { - odat := dat - switch strlwr(encoding) { - case "quoted-printable": - dat = decodeQP(dat, underscore) - case "base64": - dat = decode64(dat) - } - if dat == nil { - return nil - } - if bytes.IndexByte(dat, '\r') >= 0 { - if &odat[0] == &dat[0] { - dat = append([]byte(nil), dat...) - } - dat = nocr(dat) - } - - charset = strlwr(charset) - if charset == "utf-8" || charset == "us-ascii" { - return dat - } - if charset == "iso-8859-1" { - // Avoid allocation for iso-8859-1 that is really just ascii. - for _, c := range dat { - if c >= 0x80 { - goto NeedConv - } - } - return dat - NeedConv: - } - - // TODO: big5, iso-2022-jp - - tab := convtab[charset] - if tab == nil { - return dat - } - var b bytes.Buffer - for _, c := range dat { - if tab[c] < 0 { - b.WriteRune(unicode.ReplacementChar) - } else { - b.WriteRune(tab[c]) - } - } - return b.Bytes() -} - -var convtab = map[string]*[256]rune{ - "iso-8859-1": &tab_iso8859_1, - "iso-8859-2": &tab_iso8859_2, - "iso-8859-3": &tab_iso8859_3, - "iso-8859-4": &tab_iso8859_4, - "iso-8859-5": &tab_iso8859_5, - "iso-8859-6": &tab_iso8859_6, - "iso-8859-7": &tab_iso8859_7, - "iso-8859-8": &tab_iso8859_8, - "iso-8859-9": &tab_iso8859_9, - "iso-8859-10": &tab_iso8859_10, - "iso-8859-15": &tab_iso8859_15, - "koi8-r": &tab_koi8, - "windows-1250": &tab_cp1250, - "windows-1251": &tab_cp1251, - "windows-1252": &tab_cp1252, - "windows-1253": &tab_cp1253, - "windows-1254": &tab_cp1254, - "windows-1255": &tab_cp1255, - "windows-1256": &tab_cp1256, - "windows-1257": &tab_cp1257, - "windows-1258": &tab_cp1258, -} - -func unrfc2047(s string) string { - if !strings.Contains(s, "=?") { - return s - } - var buf bytes.Buffer - for { - // =?charset?e?text?= - i := strings.Index(s, "=?") - if i < 0 { - break - } - conv, rest, ok := decode2047chunk(s[i:]) - if !ok { - buf.WriteString(s[:i+2]) - s = s[i+2:] - continue - } - buf.WriteString(s[:i]) - buf.Write(conv) - s = rest - } - buf.WriteString(s) - return buf.String() -} - -func lwr(c rune) rune { - if 'A' <= c && c <= 'Z' { - return c + 'a' - 'A' - } - return c -} - -func strlwr(s string) string { - return strings.Map(lwr, s) -} - -func unhex(c byte) int { - switch { - case '0' <= c && c <= '9': - return int(c) - '0' - case 'a' <= c && c <= 'f': - return int(c) - 'a' + 10 - case 'A' <= c && c <= 'F': - return int(c) - 'A' + 10 - } - return -1 -} - -// TODO: Will need modified UTF-7 eventually. |