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package charset
import (
"bytes"
_ "embed"
"image"
_ "image/png"
"log"
)
// Charsets are loosely based on CP 437 and JIS X 0201.
var runesJapan2 = [256]rune{
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
0x58, 0x59, 0x5A, 0x5B, '¥', 0x5D, 0x5E, 0x5F,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, '⌂',
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
'▒', '｡', '｢', '｣', '､', '･', 'ｦ', 'ｧ',
'ｨ', 'ｩ', 'ｪ', 'ｫ', 'ｬ', 'ｭ', 'ｮ', 'ｯ',
'ｰ', 'ｱ', 'ｲ', 'ｳ', 'ｴ', 'ｵ', 'ｶ', 'ｷ',
'ｸ', 'ｹ', 'ｺ', 'ｻ', 'ｼ', 'ｽ', 'ｾ', 'ｿ',
'ﾀ', 'ﾁ', 'ﾂ', 'ﾃ', 'ﾄ', 'ﾅ', 'ﾆ', 'ﾇ',
'ﾈ', 'ﾉ', 'ﾊ', 'ﾋ', 'ﾌ', 'ﾍ', 'ﾎ', 'ﾏ',
'ﾐ', 'ﾑ', 'ﾒ', 'ﾓ', 'ﾔ', 'ﾕ', 'ﾖ', 'ﾗ',
'ﾘ', 'ﾙ', 'ﾚ', 'ﾛ', 'ﾜ', 'ﾝ', 'ﾞ', 'ﾟ',
'α', 'ß', 'Γ', 'π', 'Σ', 'σ', 'µ', 'τ',
'Φ', 'Θ', 'Ω', 'δ', '∞', 'φ', 'ε', '∩',
'→', '←', '↓', '↑', '½', '¼', '★', '◊',
'㎏', '℔', '�', '×', '▾', '▴', '日', ' ',
}
var runesInternational = [256]rune{
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, '⌂',
'Ç', 'ü', 'é', 'â', 'ä', 'à', 'å', 'ç',
'ê', 'ë', 'è', 'ï', 'î', 'ì', 'Ä', 'Å',
'É', 'æ', 'Æ', 'ô', 'ö', 'ò', 'û', 'ù',
'ÿ', 'Ö', 'Ü', '¢', '£', '¥', '₧', 'ƒ',
'á', 'í', 'ó', 'ú', 'ñ', 'Ñ', 'ª', 'º',
'¿', '⌐', '¬', '½', '¼', '¡', '«', '»',
'░', '▒', '▓' - 1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, '█', '▄', '▌', '▐', '▀',
'α', 'ß', 'Γ', 'π', 'Σ', 'σ', 'µ', 'τ',
'Φ', 'Θ', 'Ω', 'δ', '∞', 'φ', 'ε', '∩',
'≡', '±', '≥', '≤', '⌠', '⌡', '÷', '≈',
'°', '∙', '·', '√', 'ⁿ', '²', '■', ' ',
}
var runesInternationalVariants = []string{
"#$@[\\]^`{|}~", // USA
"#$à·ç§^`éùè╍", // France
"#$§ÄÖÜ^`äöüß", // Germany
"£$@[\\]^`{|}~", // UK
"#$@ÆØÅ^`æøå~", // Denmark 1
"#¤ÉÄÖÅÜéäöåü", // Sweden
"#$@·\\é^ùàòèì", // Italy
"₧$@¡Ñ¿^`╍ñ}~", // Spain
"#$@[¥]^`{|}~", // Japan
"#¤ÉÆØÅÜéæøåü", // Norway
"#$ÉÆØÅÜéæøåü", // Denmark 2
"#$á¡Ñ¿é`íñóú", // Spain 2
"#$á¡Ñ¿éüíñóú", // Latin America
}
var internationalVariantsChars = []byte{
0x23, 0x24, 0x40, 0x5B, 0x5C, 0x5D, 0x5E, 0x60, 0x7B, 0x7C, 0x7D, 0x7E}
// ResolveCharToRune tries to decode a character into a Unicode rune.
// It may return rune(-1) if the character is deemed to have no representation.
func ResolveCharToRune(char, charset uint8) rune {
if charset == 0x63 {
return runesJapan2[char]
}
if int(charset) >= len(runesInternationalVariants) {
return -1
}
for i, b := range internationalVariantsChars {
if char == b {
return []rune(runesInternationalVariants[charset])[i]
}
}
return runesInternational[char]
}
// ResolveRune tries to find a corresponding character for a Unicode rune.
func ResolveRune(r rune, charset uint8) (uint8, bool) {
if charset == 0x63 {
for i, ch := range runesJapan2 {
if ch == r {
return uint8(i), true
}
}
return 0, false
}
if int(charset) >= len(runesInternationalVariants) {
return 0, false
}
variantRunes := []rune(runesInternationalVariants[charset])
for i, ch := range variantRunes {
if ch == r {
return internationalVariantsChars[i], true
}
}
for i, ch := range runesInternational {
if ch == r {
return uint8(i), true
}
}
return 0, false
}
//go:embed japan.png
var pngJapan2 []byte
var imageJapan2 image.Image
//go:embed germany.png
var pngGermany []byte
var imageGermany image.Image
//go:embed international.png
var pngInternational []byte
var imageInternational image.Image
func init() {
var err error
imageJapan2, _, err = image.Decode(bytes.NewReader(pngJapan2))
if err != nil {
log.Fatalln(err)
}
imageGermany, _, err = image.Decode(bytes.NewReader(pngGermany))
if err != nil {
log.Fatalln(err)
}
imageInternational, _, err = image.Decode(bytes.NewReader(pngInternational))
if err != nil {
log.Fatalln(err)
}
}
// ResolveCharToImage tries to decode a character into a 5x7 bitmap image
// (white on black).
func ResolveCharToImage(char, charset uint8) image.Image {
const (
gridWidth = 6
gridHeight = 8
)
var src image.Image
var col, row int
if charset == 0x63 {
src, col, row = imageJapan2, int(char)/16, int(char)%16
} else if int(charset) < len(runesInternationalVariants) {
src, col, row = imageGermany, int(char)/16, int(char)%16
for i, b := range internationalVariantsChars {
if char == b {
src, col, row = imageInternational, i, int(charset)
}
}
} else {
return nil
}
x0 := col * gridWidth
y0 := row * gridHeight
return src.(interface {
SubImage(r image.Rectangle) image.Image
}).SubImage(image.Rect(
x0,
y0,
x0+gridWidth-1,
y0+gridHeight-1,
))
}
|
