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'use strict';
const common = require('../common');
const assert = require('assert');
const b = Buffer.allocUnsafe(1024);
const c = Buffer.allocUnsafe(512);
const errorProperty = {
code: 'ERR_OUT_OF_RANGE',
type: RangeError,
message: 'Index out of range'
};
let 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(copied, 512);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(c[i], b[i]);
}
}
{
// copy c into b, without specifying sourceEnd
b.fill(++cntr);
c.fill(++cntr);
const copied = c.copy(b, 0, 0);
assert.strictEqual(copied, c.length);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
{
// copy c into b, without specifying sourceStart
b.fill(++cntr);
c.fill(++cntr);
const copied = c.copy(b, 0);
assert.strictEqual(copied, c.length);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(b[i], c[i]);
}
}
{
// Copy longer buffer b to shorter c without targetStart
b.fill(++cntr);
c.fill(++cntr);
const copied = b.copy(c);
assert.strictEqual(copied, c.length);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(c[i], b[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(copied, Math.floor(c.length / 2));
for (let i = 0; i < Math.floor(c.length / 2); i++) {
assert.strictEqual(c[i], b[b.length - Math.floor(c.length / 2) + 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(copied, c.length);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(c[i], b[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(copied, 768);
for (let i = 0; i < b.length; i++) {
assert.strictEqual(b[i], cntr);
}
}
// 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. Should not throw.
b.copy(c, 0, 100, 10);
// copy throws at negative sourceStart
common.expectsError(
() => Buffer.allocUnsafe(5).copy(Buffer.allocUnsafe(5), 0, -1),
errorProperty);
{
// 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(c[i], b[i]);
}
}
// throw with negative sourceEnd
common.expectsError(
() => b.copy(c, 0, -1), errorProperty);
// 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);
// Test that the `target` can be a Uint8Array.
{
const d = new Uint8Array(c);
// copy 512 bytes, from 0 to 512.
b.fill(++cntr);
d.fill(++cntr);
const copied = b.copy(d, 0, 0, 512);
assert.strictEqual(copied, 512);
for (let i = 0; i < d.length; i++) {
assert.strictEqual(d[i], b[i]);
}
}
// Test that the source can be a Uint8Array, too.
{
const e = new Uint8Array(b);
// copy 512 bytes, from 0 to 512.
e.fill(++cntr);
c.fill(++cntr);
const copied = Buffer.prototype.copy.call(e, c, 0, 0, 512);
assert.strictEqual(copied, 512);
for (let i = 0; i < c.length; i++) {
assert.strictEqual(c[i], e[i]);
}
}
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