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93 lines
2.3 KiB
93 lines
2.3 KiB
"use strict";
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const Blob = require("../generated/Blob");
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function convertLineEndingsToNative(s) {
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// jsdom always pretends to be *nix, for consistency.
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// See also https://github.com/jsdom/jsdom/issues/2396.
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return s.replace(/\r\n|\r|\n/g, "\n");
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}
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exports.implementation = class BlobImpl {
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constructor(args) {
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const parts = args[0];
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const properties = args[1];
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const buffers = [];
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if (parts !== undefined) {
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for (const part of parts) {
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let buffer;
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if (part instanceof ArrayBuffer) {
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buffer = Buffer.from(part);
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} else if (ArrayBuffer.isView(part)) {
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buffer = Buffer.from(part.buffer, part.byteOffset, part.byteLength);
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} else if (Blob.isImpl(part)) {
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buffer = part._buffer;
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} else {
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let s = part;
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if (properties.endings === "native") {
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s = convertLineEndingsToNative(part);
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}
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buffer = Buffer.from(s);
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}
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buffers.push(buffer);
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}
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}
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this._buffer = Buffer.concat(buffers);
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this.type = properties.type;
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if (/[^\u0020-\u007E]/.test(this.type)) {
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this.type = "";
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} else {
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this.type = this.type.toLowerCase();
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}
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}
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get size() {
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return this._buffer.length;
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}
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slice(start, end, contentType) {
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const { size } = this;
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let relativeStart;
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let relativeEnd;
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let relativeContentType;
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if (start === undefined) {
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relativeStart = 0;
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} else if (start < 0) {
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relativeStart = Math.max(size + start, 0);
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} else {
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relativeStart = Math.min(start, size);
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}
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if (end === undefined) {
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relativeEnd = size;
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} else if (end < 0) {
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relativeEnd = Math.max(size + end, 0);
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} else {
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relativeEnd = Math.min(end, size);
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}
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if (contentType === undefined) {
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relativeContentType = "";
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} else {
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// sanitization (lower case and invalid char check) is done in the
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// constructor
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relativeContentType = contentType;
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}
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const span = Math.max(relativeEnd - relativeStart, 0);
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const buffer = this._buffer;
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const slicedBuffer = buffer.slice(
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relativeStart,
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relativeStart + span
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);
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const blob = Blob.createImpl([[], { type: relativeContentType }], {});
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blob._buffer = slicedBuffer;
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return blob;
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}
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};
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