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Fix issues surrounding type checking for Uint8Arrays and Buffers (#346)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,179 @@ | ||
| 'use strict' | ||
|
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| const Buffer = require('../').Buffer | ||
| const test = require('tape') | ||
| const vm = require('vm') | ||
|
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| // Get a Uint8Array and Buffer constructor from another context. | ||
| const code = ` | ||
| 'use strict' | ||
| function Buffer (...args) { | ||
| const buf = new Uint8Array(...args) | ||
| Object.setPrototypeOf(buf, Buffer.prototype) | ||
| return buf | ||
| } | ||
| Object.setPrototypeOf(Buffer.prototype, Uint8Array.prototype) | ||
| Object.setPrototypeOf(Buffer, Uint8Array) | ||
| Buffer.prototype._isBuffer = true | ||
| exports.Uint8Array = Uint8Array | ||
| exports.Buffer = Buffer | ||
| ` | ||
|
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| const context = {} | ||
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| // Should work in browserify. | ||
| vm.runInNewContext(code, { exports: context }) | ||
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| const arrays = [context.Uint8Array, context.Buffer] | ||
|
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| // Extracted from the index.js code for testing purposes. | ||
| function isInstance (obj, type) { | ||
| return (obj instanceof type) || | ||
| (obj != null && | ||
| obj.constructor != null && | ||
| obj.constructor.name != null && | ||
| obj.constructor.name === type.name) || | ||
| (type === Uint8Array && Buffer.isBuffer(obj)) | ||
| } | ||
|
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| test('Uint8Arrays and Buffers from other contexts', (t) => { | ||
| // Our buffer is considered a view. | ||
| t.ok(ArrayBuffer.isView(Buffer.alloc(0))) | ||
|
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| for (const ForeignArray of arrays) { | ||
| const buf = new ForeignArray(1) | ||
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| buf[0] = 1 | ||
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| // Prove that ArrayBuffer.isView and isInstance | ||
| // return true for objects from other contexts. | ||
| t.ok(!(buf instanceof Object)) | ||
| t.ok(!(buf instanceof Uint8Array)) | ||
| t.ok(!(buf instanceof Buffer)) | ||
| t.ok(ArrayBuffer.isView(buf)) | ||
|
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| // Now returns true even for Buffers from other contexts: | ||
| t.ok(isInstance(buf, Uint8Array)) | ||
|
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| if (ForeignArray === context.Uint8Array) { | ||
| t.ok(!Buffer.isBuffer(buf)) | ||
| } else { | ||
| t.ok(Buffer.isBuffer(buf)) | ||
| } | ||
|
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| // They even behave the same! | ||
| const copy = new Uint8Array(buf) | ||
|
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| t.ok(copy instanceof Object) | ||
| t.ok(copy instanceof Uint8Array) | ||
| t.ok(ArrayBuffer.isView(copy)) | ||
| t.equal(copy[0], 1) | ||
| } | ||
|
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| t.end() | ||
| }) | ||
|
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| test('should instantiate from foreign arrays', (t) => { | ||
| for (const ForeignArray of arrays) { | ||
| const arr = new ForeignArray(2) | ||
|
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| arr[0] = 1 | ||
| arr[1] = 2 | ||
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| const buf = Buffer.from(arr) | ||
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| t.equal(buf.toString('hex'), '0102') | ||
| } | ||
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| t.end() | ||
| }) | ||
|
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| test('should do comparisons with foreign arrays', (t) => { | ||
| const a = Buffer.from([1, 2, 3]) | ||
| const b = new context.Uint8Array(a) | ||
| const c = new context.Buffer(a) | ||
|
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| t.equal(Buffer.byteLength(a), 3) | ||
| t.equal(Buffer.byteLength(b), 3) | ||
| t.equal(Buffer.byteLength(c), 3) | ||
| t.equal(b[0], 1) | ||
| t.equal(c[0], 1) | ||
|
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| t.ok(a.equals(b)) | ||
| t.ok(a.equals(c)) | ||
| t.ok(a.compare(b) === 0) | ||
| t.ok(a.compare(c) === 0) | ||
| t.ok(Buffer.compare(a, b) === 0) | ||
| t.ok(Buffer.compare(a, c) === 0) | ||
| t.ok(Buffer.compare(b, c) === 0) | ||
| t.ok(Buffer.compare(c, b) === 0) | ||
|
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| a[0] = 0 | ||
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| t.ok(!a.equals(b)) | ||
| t.ok(!a.equals(c)) | ||
| t.ok(a.compare(b) < 0) | ||
| t.ok(a.compare(c) < 0) | ||
| t.ok(Buffer.compare(a, b) < 0) | ||
| t.ok(Buffer.compare(a, c) < 0) | ||
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| b[0] = 0 | ||
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| t.ok(Buffer.compare(b, c) < 0) | ||
| t.ok(Buffer.compare(c, b) > 0) | ||
|
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| t.end() | ||
| }) | ||
|
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| test('should fill with foreign arrays', (t) => { | ||
| for (const ForeignArray of arrays) { | ||
| const buf = Buffer.alloc(4) | ||
| const arr = new ForeignArray(2) | ||
|
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| arr[0] = 1 | ||
| arr[1] = 2 | ||
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| buf.fill(arr) | ||
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| t.equal(buf.toString('hex'), '01020102') | ||
| } | ||
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| t.end() | ||
| }) | ||
|
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| test('should do concatenation with foreign arrays', (t) => { | ||
| for (const ForeignArray of arrays) { | ||
| const a = new ForeignArray(2) | ||
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| a[0] = 1 | ||
| a[1] = 2 | ||
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| const b = new ForeignArray(a) | ||
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| { | ||
| const buf = Buffer.concat([a, b]) | ||
| t.equal(buf.toString('hex'), '01020102') | ||
| } | ||
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| { | ||
| const buf = Buffer.concat([a, b], 3) | ||
| t.equal(buf.toString('hex'), '010201') | ||
| } | ||
| } | ||
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| t.end() | ||
| }) | ||
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| test('should copy on to foreign arrays', (t) => { | ||
| for (const ForeignArray of arrays) { | ||
| const a = Buffer.from([1, 2]) | ||
| const b = new ForeignArray(2) | ||
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| a.copy(b) | ||
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| t.equal(b[0], 1) | ||
| t.equal(b[1], 2) | ||
| } | ||
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| t.end() | ||
| }) |
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