zlib: support Uint8Array in convenience methods by TimothyGu · Pull Request #12001 · nodejs/node · GitHub
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zlib: support Uint8Array in convenience methods #12001

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zlib: support Uint8Array in convenience methods #12001

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zlib: support Uint8Array in convenience methods
TimothyGu Mar 23, 2017
0a41bf0
Address review comments
TimothyGu Mar 30, 2017
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139 changes: 107 additions & 32 deletions doc/api/zlib.md
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19 changes: 14 additions & 5 deletions lib/zlib.js
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
const Buffer = require('buffer').Buffer;
const internalUtil = require('internal/util');
const Transform = require('_stream_transform');
const { isUint8Array } = process.binding('util');
const binding = process.binding('zlib');
const assert = require('assert').ok;
const kMaxLength = require('buffer').kMaxLength;
Expand Down Expand Up @@ -78,6 +79,13 @@ function isInvalidStrategy(strategy) {
}

function zlibBuffer(engine, buffer, callback) {
// Streams do not support non-Buffer Uint8Arrays yet. Convert it to a
// Buffer without copying.
if (isUint8Array(buffer) &&
Object.getPrototypeOf(buffer) !== Buffer.prototype) {
buffer = Buffer.from(buffer.buffer, buffer.byteOffset, buffer.byteLength);
}

var buffers = [];
var nread = 0;

Expand Down Expand Up @@ -121,8 +129,9 @@ function zlibBuffer(engine, buffer, callback) {
function zlibBufferSync(engine, buffer) {
if (typeof buffer === 'string')
buffer = Buffer.from(buffer);
if (!(buffer instanceof Buffer))
throw new TypeError('Not a string or buffer');
else if (!isUint8Array(buffer))
throw new TypeError('"buffer" argument must be a string, Buffer, or ' +
'Uint8Array');

var flushFlag = engine._finishFlushFlag;

Expand Down Expand Up @@ -205,9 +214,9 @@ class Zlib extends Transform {
throw new TypeError('Invalid strategy: ' + opts.strategy);

if (opts.dictionary) {
if (!(opts.dictionary instanceof Buffer)) {
if (!isUint8Array(opts.dictionary)) {
throw new TypeError(
'Invalid dictionary: it should be a Buffer instance');
'Invalid dictionary: it should be a Buffer or an Uint8Array');
}
}

Expand Down Expand Up @@ -302,7 +311,7 @@ class Zlib extends Transform {
var ending = ws.ending || ws.ended;
var last = ending && (!chunk || ws.length === chunk.length);

if (chunk !== null && !(chunk instanceof Buffer))
if (chunk !== null && !isUint8Array(chunk))
return cb(new TypeError('invalid input'));

if (!this._handle)
Expand Down
81 changes: 41 additions & 40 deletions test/parallel/test-zlib-convenience-methods.js
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Original file line number Diff line number Diff line change
Expand Up @@ -22,59 +22,60 @@
'use strict';
// test convenience methods with and without options supplied

require('../common');
const common = require('../common');
const assert = require('assert');
const zlib = require('zlib');

let hadRun = 0;

const expect = 'blahblahblahblahblahblah';
const expectStr = 'blahblahblahblahblahblah';
const expectBuf = Buffer.from(expectStr);
const expectUint8Array = new Uint8Array(expectBuf);
const opts = {
level: 9,
chunkSize: 1024,
};

[
for (const method of [
['gzip', 'gunzip'],
['gzip', 'unzip'],
['deflate', 'inflate'],
['deflateRaw', 'inflateRaw'],
].forEach(function(method) {

zlib[method[0]](expect, opts, function(err, result) {
zlib[method[1]](result, opts, function(err, result) {
assert.strictEqual(result.toString(), expect,
'Should get original string after ' +
method[0] + '/' + method[1] + ' with options.');
hadRun++;
});
});

zlib[method[0]](expect, function(err, result) {
zlib[method[1]](result, function(err, result) {
assert.strictEqual(result.toString(), expect,
'Should get original string after ' +
method[0] + '/' + method[1] + ' without options.');
hadRun++;
});
});
]) {
for (const [type, expect] of [
['string', expectStr],
['Buffer', expectBuf],
['Uint8Array', expectUint8Array]
]) {
zlib[method[0]](expect, opts, common.mustCall((err, result) => {
zlib[method[1]](result, opts, common.mustCall((err, result) => {
assert.strictEqual(result.toString(), expectStr,
`Should get original string after ${method[0]}/` +
`${method[1]} ${type} with options.`);
}));
}));

let result = zlib[method[0] + 'Sync'](expect, opts);
result = zlib[method[1] + 'Sync'](result, opts);
assert.strictEqual(result.toString(), expect,
'Should get original string after ' +
method[0] + '/' + method[1] + ' with options.');
hadRun++;
zlib[method[0]](expect, common.mustCall((err, result) => {
zlib[method[1]](result, common.mustCall((err, result) => {
assert.strictEqual(result.toString(), expectStr,
`Should get original string after ${method[0]}/` +
`${method[1]} ${type} without options.`);
}));
}));

result = zlib[method[0] + 'Sync'](expect);
result = zlib[method[1] + 'Sync'](result);
assert.strictEqual(result.toString(), expect,
'Should get original string after ' +
method[0] + '/' + method[1] + ' without options.');
hadRun++;
{
const compressed = zlib[method[0] + 'Sync'](expect, opts);
const decompressed = zlib[method[1] + 'Sync'](compressed, opts);
assert.strictEqual(decompressed.toString(), expectStr,
`Should get original string after ${method[0]}Sync/` +
`${method[1]}Sync ${type} with options.`);
}

});

process.on('exit', function() {
assert.strictEqual(hadRun, 16, 'expect 16 compressions');
});
{
const compressed = zlib[method[0] + 'Sync'](expect);
const decompressed = zlib[method[1] + 'Sync'](compressed);
assert.strictEqual(decompressed.toString(), expectStr,
`Should get original string after ${method[0]}Sync/` +
`${method[1]}Sync ${type} without options.`);
}
}
}
2 changes: 1 addition & 1 deletion test/parallel/test-zlib-deflate-constructors.js
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