mirror of https://gitee.com/openkylin/nodejs.git
60 lines
1.7 KiB
JavaScript
60 lines
1.7 KiB
JavaScript
'use strict';
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const common = require('../common');
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// This test ensures that fs.readFile correctly returns the
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// contents of varying-sized files.
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const tmpdir = require('../../test/common/tmpdir');
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const assert = require('assert');
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const fs = require('fs');
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const path = require('path');
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const prefix = `.removeme-fs-readfile-${process.pid}`;
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tmpdir.refresh();
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const fileInfo = [
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{ name: path.join(tmpdir.path, `${prefix}-1K.txt`),
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len: 1024,
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},
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{ name: path.join(tmpdir.path, `${prefix}-64K.txt`),
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len: 64 * 1024,
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},
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{ name: path.join(tmpdir.path, `${prefix}-64KLessOne.txt`),
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len: (64 * 1024) - 1,
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},
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{ name: path.join(tmpdir.path, `${prefix}-1M.txt`),
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len: 1 * 1024 * 1024,
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},
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{ name: path.join(tmpdir.path, `${prefix}-1MPlusOne.txt`),
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len: (1 * 1024 * 1024) + 1,
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},
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];
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// Populate each fileInfo (and file) with unique fill.
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const sectorSize = 512;
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for (const e of fileInfo) {
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e.contents = Buffer.allocUnsafe(e.len);
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// This accounts for anything unusual in Node's implementation of readFile.
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// Using e.g. 'aa...aa' would miss bugs like Node re-reading
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// the same section twice instead of two separate sections.
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for (let offset = 0; offset < e.len; offset += sectorSize) {
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const fillByte = 256 * Math.random();
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const nBytesToFill = Math.min(sectorSize, e.len - offset);
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e.contents.fill(fillByte, offset, offset + nBytesToFill);
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}
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fs.writeFileSync(e.name, e.contents);
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}
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// All files are now populated.
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// Test readFile on each size.
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for (const e of fileInfo) {
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fs.readFile(e.name, common.mustCall((err, buf) => {
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console.log(`Validating readFile on file ${e.name} of length ${e.len}`);
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assert.ifError(err);
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assert.deepStrictEqual(buf, e.contents);
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}));
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}
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