Elijah
724d70e58b
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34 lines
1 KiB
JavaScript
34 lines
1 KiB
JavaScript
import { ReadStream } from 'fs'
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import isStream from 'is-stream'
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import BufferSource from './sources/BufferSource.js'
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import getFileSource from './sources/FileSource.js'
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import StreamSource from './sources/StreamSource.js'
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export default class FileReader {
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openFile(input, chunkSize) {
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if (Buffer.isBuffer(input)) {
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return Promise.resolve(new BufferSource(input))
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}
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if (input instanceof ReadStream && input.path != null) {
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return getFileSource(input)
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}
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if (isStream.readable(input)) {
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chunkSize = Number(chunkSize)
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if (!Number.isFinite(chunkSize)) {
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return Promise.reject(
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new Error(
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'cannot create source for stream without a finite value for the `chunkSize` option; specify a chunkSize to control the memory consumption',
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),
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)
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}
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return Promise.resolve(new StreamSource(input))
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}
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return Promise.reject(
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new Error('source object may only be an instance of Buffer or Readable in this environment'),
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)
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}
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}
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