diff options
Diffstat (limited to 'liust-50/charset/charset.go')
| -rw-r--r-- | liust-50/charset/charset.go | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/liust-50/charset/charset.go b/liust-50/charset/charset.go new file mode 100644 index 0000000..61196d6 --- /dev/null +++ b/liust-50/charset/charset.go @@ -0,0 +1,211 @@ +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, + )) +} |