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test-buffer-copy.js
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120 lines (103 loc) · 2.88 KB
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'use strict';
require('../common');
const assert = require('assert');
const b = Buffer.allocUnsafe(1024);
const c = Buffer.allocUnsafe(512);
var cntr = 0;
{
// copy 512 bytes, from 0 to 512.
b.fill(++cntr);
c.fill(++cntr);
const copied = b.copy(c, 0, 0, 512);
assert.strictEqual(512, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
{
// copy c into b, without specifying sourceEnd
b.fill(++cntr);
c.fill(++cntr);
const copied = c.copy(b, 0, 0);
assert.strictEqual(c.length, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(c[i], b[i]);
}
}
{
// copy c into b, without specifying sourceStart
b.fill(++cntr);
c.fill(++cntr);
const copied = c.copy(b, 0);
assert.strictEqual(c.length, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(c[i], b[i]);
}
}
{
// copy longer buffer b to shorter c without targetStart
b.fill(++cntr);
c.fill(++cntr);
const copied = b.copy(c);
assert.strictEqual(c.length, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
{
// copy starting near end of b to c
b.fill(++cntr);
c.fill(++cntr);
const copied = b.copy(c, 0, b.length - Math.floor(c.length / 2));
assert.strictEqual(Math.floor(c.length / 2), copied);
for (let i = 0; i < Math.floor(c.length / 2); i++) {
assert.strictEqual(b[b.length - Math.floor(c.length / 2) + i], c[i]);
}
for (let i = Math.floor(c.length / 2) + 1; i < c.length; i++) {
assert.strictEqual(c[c.length - 1], c[i]);
}
}
{
// try to copy 513 bytes, and check we don't overrun c
b.fill(++cntr);
c.fill(++cntr);
const copied = b.copy(c, 0, 0, 513);
assert.strictEqual(c.length, copied);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
{
// copy 768 bytes from b into b
b.fill(++cntr);
b.fill(++cntr, 256);
const copied = b.copy(b, 0, 256, 1024);
assert.strictEqual(768, copied);
for (let i = 0; i < b.length; i++) {
assert.strictEqual(cntr, b[i]);
}
}
// copy string longer than buffer length (failure will segfault)
const bb = Buffer.allocUnsafe(10);
bb.fill('hello crazy world');
// try to copy from before the beginning of b
assert.doesNotThrow(() => { b.copy(c, 0, 100, 10); });
// copy throws at negative sourceStart
assert.throws(function() {
Buffer.allocUnsafe(5).copy(Buffer.allocUnsafe(5), 0, -1);
}, RangeError);
{
// check sourceEnd resets to targetEnd if former is greater than the latter
b.fill(++cntr);
c.fill(++cntr);
b.copy(c, 0, 0, 1025);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
// throw with negative sourceEnd
assert.throws(() => b.copy(c, 0, 0, -1), RangeError);
// when sourceStart is greater than sourceEnd, zero copied
assert.strictEqual(b.copy(c, 0, 100, 10), 0);
// when targetStart > targetLength, zero copied
assert.strictEqual(b.copy(c, 512, 0, 10), 0);