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62 lines
1.5 KiB
62 lines
1.5 KiB
4 years ago
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/**
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* @module to-array-buffer
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*/
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'use strict'
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var str2ab = require('string-to-arraybuffer')
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var flat = require('flatten-vertex-data')
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// var isBlob = require('is-blob')
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module.exports = function toArrayBuffer (arg) {
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//zero-length or undefined-like
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if (!arg) return null
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//array buffer
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if (arg instanceof ArrayBuffer) return arg
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//try to decode data-uri
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if (typeof arg === 'string') {
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return str2ab(arg)
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}
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// File & Blob
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// if (isBlob(src) || (src instanceof global.File)) {
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// FIXME: we cannot use it here bc FileReader is async
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// }
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//array buffer view: TypedArray, DataView, Buffer etc
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if (ArrayBuffer.isView(arg)) {
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// if byteOffset is not 0, return sub-reference (slice is the only way)
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if (arg.byteOffset) {
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return arg.buffer.slice(arg.byteOffset, arg.byteOffset + arg.byteLength)
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}
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return arg.buffer
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}
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//buffer/data nested: NDArray, ImageData etc.
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//FIXME: NDArrays with custom data type may be invalid for this procedure
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if (arg.buffer || arg.data || arg._data) {
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var result = toArrayBuffer(arg.buffer || arg.data || arg._data)
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return result
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}
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// detect if flat
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if (Array.isArray(arg)) {
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for (var i = 0; i < arg.length; i++) {
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if (arg[i].length != null) {
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arg = flat(arg)
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break
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}
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}
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}
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//array-like or unknown
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//consider Uint8Array knows how to treat the input
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var result = new Uint8Array(arg)
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if (!result.length) return null
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return result.buffer
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}
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