55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
const Mode = require('./mode')
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const Utils = require('./utils')
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function KanjiData (data) {
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this.mode = Mode.KANJI
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this.data = data
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}
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KanjiData.getBitsLength = function getBitsLength (length) {
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return length * 13
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}
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KanjiData.prototype.getLength = function getLength () {
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return this.data.length
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}
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KanjiData.prototype.getBitsLength = function getBitsLength () {
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return KanjiData.getBitsLength(this.data.length)
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}
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KanjiData.prototype.write = function (bitBuffer) {
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let i
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// In the Shift JIS system, Kanji characters are represented by a two byte combination.
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// These byte values are shifted from the JIS X 0208 values.
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// JIS X 0208 gives details of the shift coded representation.
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for (i = 0; i < this.data.length; i++) {
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let value = Utils.toSJIS(this.data[i])
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// For characters with Shift JIS values from 0x8140 to 0x9FFC:
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if (value >= 0x8140 && value <= 0x9FFC) {
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// Subtract 0x8140 from Shift JIS value
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value -= 0x8140
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// For characters with Shift JIS values from 0xE040 to 0xEBBF
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} else if (value >= 0xE040 && value <= 0xEBBF) {
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// Subtract 0xC140 from Shift JIS value
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value -= 0xC140
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} else {
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throw new Error(
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'Invalid SJIS character: ' + this.data[i] + '\n' +
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'Make sure your charset is UTF-8')
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}
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// Multiply most significant byte of result by 0xC0
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// and add least significant byte to product
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value = (((value >>> 8) & 0xff) * 0xC0) + (value & 0xff)
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// Convert result to a 13-bit binary string
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bitBuffer.put(value, 13)
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}
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}
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module.exports = KanjiData
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