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import { TextEncoding } from "./definitions/Encoding" |
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import { stringToEncodedBuffer } from "./util-text-encoding" |
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4
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type Size = { size: number } |
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5
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6
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export class FrameBuilder { |
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private identifier: string |
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private encoding: TextEncoding = TextEncoding.ISO_8859_1 |
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private buffer = Buffer.alloc(0) |
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// TODO remove identifier |
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constructor( |
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identifier: string, |
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encoding?: TextEncoding |
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) { |
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this.identifier = identifier |
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if (encoding !== undefined) { |
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this.encoding = encoding |
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this.appendNumber(encoding, {size: 1}) |
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} |
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} |
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appendBuffer(buffer: Buffer) { |
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this.buffer = Buffer.concat([this.buffer, buffer]) |
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return this |
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} |
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appendNumber(value: number, {size}: Size) { |
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if (!Number.isInteger(value)) { |
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throw new RangeError("An integer value is expected") |
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31
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} |
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let hexValue = value.toString(16) |
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if (hexValue.length % 2 !== 0) { |
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hexValue = "0" + hexValue |
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} |
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const valueBuffer = Buffer.from(hexValue, 'hex') |
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const zeroPad = Buffer.alloc(size - valueBuffer.length) |
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return this.appendBuffer( |
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Buffer.concat([zeroPad, valueBuffer]).subarray(0, size) |
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) |
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} |
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appendText(text: string, encoding: TextEncoding = TextEncoding.ISO_8859_1) { |
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// TODO remove the .toString() for new API release |
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return this.appendBuffer( |
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stringToEncodedBuffer(text.toString(), encoding) |
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) |
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} |
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appendTextWithFrameEncoding(text: string) { |
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return this.appendText(text, this.encoding) |
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} |
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appendTerminatedText( |
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text: string, |
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encoding: TextEncoding = TextEncoding.ISO_8859_1 |
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) { |
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// TODO remove the .toString() for new API release |
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return this.appendText(text.toString() + "\0", encoding) |
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} |
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appendTerminatedTextWithFrameEncoding(text: string) { |
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return this.appendTerminatedText(text, this.encoding) |
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} |
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65
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66
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appendArray<T>( |
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values: T[], |
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callback: (builder: FrameBuilder, value: T) => void |
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) { |
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values.forEach(value => callback(this, value)) |
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return this |
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} |
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getBuffer() { |
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return this.buffer |
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} |
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78
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// TODO remove this function |
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getBufferWithPartialHeader() { |
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const header = Buffer.alloc(10) |
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header.write(this.identifier, 0) |
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header.writeUInt32BE(this.buffer.length, 4) |
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return Buffer.concat([header, this.buffer]) |
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84
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} |
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86
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} |
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Zazama /
node-id3
