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33 lines
896 B
TypeScript
33 lines
896 B
TypeScript
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const partials = [
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[0b110, 5, 0],
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[0b1110, 4, 1],
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[0b11110, 3, 2],
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]
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export class UTF8Splitter {
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private internal = Buffer.alloc(0)
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write (data: Buffer): Buffer {
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this.internal = Buffer.concat([this.internal, data])
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let keep = 0
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for (const [pattern, shift, maxOffset] of partials) {
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for (let offset = 0; offset < maxOffset + 1; offset++) {
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if (this.internal[this.internal.length - offset - 1] >> shift === pattern) {
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keep = Math.max(keep, offset + 1)
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}
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}
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}
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const result = this.internal.slice(0, this.internal.length - keep)
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this.internal = this.internal.slice(this.internal.length - keep)
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return result
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}
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flush (): Buffer {
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const result = this.internal
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this.internal = Buffer.alloc(0)
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return result
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}
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}
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