node/test/parallel/test-stream2-set-encoding.js

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';
const common = require('../common');
const assert = require('assert');
const R = require('_stream_readable');
const util = require('util');

util.inherits(TestReader, R);

function TestReader(n, opts) {
  R.call(this, opts);

  this.pos = 0;
  this.len = n || 100;
}

TestReader.prototype._read = function(n) {
  setTimeout(function() {

    if (this.pos >= this.len) {
      // double push(null) to test eos handling
      this.push(null);
      return this.push(null);
    }

    n = Math.min(n, this.len - this.pos);
    if (n <= 0) {
      // double push(null) to test eos handling
      this.push(null);
      return this.push(null);
    }

    this.pos += n;
    const ret = Buffer.alloc(n, 'a');

    return this.push(ret);
  }.bind(this), 1);
};

{
  // Verify utf8 encoding
  const tr = new TestReader(100);
  tr.setEncoding('utf8');
  const out = [];
  const expect =
    [ 'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa' ];

  tr.on('readable', function flow() {
    let chunk;
    while (null !== (chunk = tr.read(10)))
      out.push(chunk);
  });

  tr.on('end', common.mustCall(function() {
    assert.deepStrictEqual(out, expect);
  }));
}


{
  // Verify hex encoding
  const tr = new TestReader(100);
  tr.setEncoding('hex');
  const out = [];
  const expect =
    [ '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161' ];

  tr.on('readable', function flow() {
    let chunk;
    while (null !== (chunk = tr.read(10)))
      out.push(chunk);
  });

  tr.on('end', common.mustCall(function() {
    assert.deepStrictEqual(out, expect);
  }));
}

{
  // Verify hex encoding with read(13)
  const tr = new TestReader(100);
  tr.setEncoding('hex');
  const out = [];
  const expect =
    [ '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '16161' ];

  tr.on('readable', function flow() {
    let chunk;
    while (null !== (chunk = tr.read(13)))
      out.push(chunk);
  });

  tr.on('end', common.mustCall(function() {
    assert.deepStrictEqual(out, expect);
  }));
}

{
  // Verify base64 encoding
  const tr = new TestReader(100);
  tr.setEncoding('base64');
  const out = [];
  const expect =
    [ 'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYQ==' ];

  tr.on('readable', function flow() {
    let chunk;
    while (null !== (chunk = tr.read(10)))
      out.push(chunk);
  });

  tr.on('end', common.mustCall(function() {
    assert.deepStrictEqual(out, expect);
  }));
}

{
  // Verify utf8 encoding
  const tr = new TestReader(100, { encoding: 'utf8' });
  const out = [];
  const expect =
    [ 'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa',
      'aaaaaaaaaa' ];

  tr.on('readable', function flow() {
    let chunk;
    while (null !== (chunk = tr.read(10)))
      out.push(chunk);
  });

  tr.on('end', common.mustCall(function() {
    assert.deepStrictEqual(out, expect);
  }));
}


{
  // Verify hex encoding
  const tr = new TestReader(100, { encoding: 'hex' });
  const out = [];
  const expect =
    [ '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161',
      '6161616161' ];

  tr.on('readable', function flow() {
    let chunk;
    while (null !== (chunk = tr.read(10)))
      out.push(chunk);
  });

  tr.on('end', common.mustCall(function() {
    assert.deepStrictEqual(out, expect);
  }));
}

{
  // Verify hex encoding with read(13)
  const tr = new TestReader(100, { encoding: 'hex' });
  const out = [];
  const expect =
    [ '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '1616161616161',
      '6161616161616',
      '16161' ];

  tr.on('readable', function flow() {
    let chunk;
    while (null !== (chunk = tr.read(13)))
      out.push(chunk);
  });

  tr.on('end', common.mustCall(function() {
    assert.deepStrictEqual(out, expect);
  }));
}

{
  // Verify base64 encoding
  const tr = new TestReader(100, { encoding: 'base64' });
  const out = [];
  const expect =
    [ 'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYWFhYWFh',
      'YWFhYWFhYW',
      'FhYQ==' ];

  tr.on('readable', function flow() {
    let chunk;
    while (null !== (chunk = tr.read(10)))
      out.push(chunk);
  });

  tr.on('end', common.mustCall(function() {
    assert.deepStrictEqual(out, expect);
  }));
}

{
  // Verify chaining behavior
  const tr = new TestReader(100);
  assert.deepStrictEqual(tr.setEncoding('utf8'), tr);
}