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