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import { Frame } from './Frame' |
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import { getFrameSize } from './FrameHeader' |
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import { Options } from "./types/Options" |
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import { Tags, TagIdentifiers } from './types/Tags' |
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import { convertRawTagsToTagAliases } from "./TagsConverters" |
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import { getFrameOptions } from './util-frame-options' |
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type FramesData = { |
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buffer: Buffer |
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version: number |
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} |
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export function getTags( |
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framesData: FramesData | undefined, |
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options: Options = {} |
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) { |
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const { buffer, version } = |
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framesData ?? { buffer: Buffer.alloc(0), version: 3 } |
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const frames = decodeFrames(buffer, version, options) |
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return convertFramesToTags(frames, version, options) |
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} |
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function convertFramesToTags( |
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frames: Frame[], |
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_version: number, |
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options: Options = {} |
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): Tags | TagIdentifiers { |
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const pushValue = (dest: unknown, value: unknown) => { |
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const destArray = Array.isArray(dest) ? dest : [] |
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destArray.push(value) |
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return destArray |
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} |
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const getValue = (_dest: unknown, value: unknown) => value |
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const rawTags = frames.reduce<TagIdentifiers>((tags, frame) => { |
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const frameId = frame.identifier as keyof TagIdentifiers |
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const isMultiple = getFrameOptions(frameId).multiple |
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const makeValue = isMultiple ? pushValue : getValue |
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tags[frameId] = makeValue(tags[frameId], frame.getValue()) as never |
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return tags |
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}, {}) |
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if (options.onlyRaw) { |
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return rawTags |
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} |
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const tags = convertRawTagsToTagAliases(rawTags) |
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if (options.noRaw) { |
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return tags |
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} |
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return { ...tags, raw: rawTags } |
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} |
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function decodeFrames( |
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buffer: Buffer, |
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version: number, |
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options: Options = {} |
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): Frame[] { |
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const frames = [] |
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while(buffer.length && buffer[0] !== 0x00) { |
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const frameSize = getFrameSize(buffer, version) |
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// Prevent errors due to broken data. |
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if (frameSize > buffer.length) { |
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break |
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} |
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const frameBuffer = buffer.subarray(0, frameSize) |
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const frame = Frame.createFromBuffer(frameBuffer, version) |
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if (frame && !isFrameDiscarded(frame.identifier, options)) { |
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frames.push(frame) |
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} |
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buffer = buffer.subarray(frameSize) |
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} |
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return frames |
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} |
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function isFrameDiscarded(frameId: string, options: Options) { |
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if (Array.isArray(options.exclude) && options.exclude.includes(frameId)) { |
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return true |
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} |
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return Array.isArray(options.include) && !options.include.includes(frameId) |
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} |
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Zazama /
node-id3
