csrc/node-v0.10.24/test/simple/test-writedouble.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
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// 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.
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// USE OR OTHER DEALINGS IN THE SOFTWARE.

/*
 * Tests to verify we're writing doubles correctly
 */
var SlowBuffer = process.binding('buffer').SlowBuffer;
var common = require('../common');
var ASSERT = require('assert');

function test(clazz) {
  var buffer = new clazz(16);

  buffer.writeDoubleBE(2.225073858507201e-308, 0);
  buffer.writeDoubleLE(2.225073858507201e-308, 8);
  ASSERT.equal(0x00, buffer[0]);
  ASSERT.equal(0x0f, buffer[1]);
  ASSERT.equal(0xff, buffer[2]);
  ASSERT.equal(0xff, buffer[3]);
  ASSERT.equal(0xff, buffer[4]);
  ASSERT.equal(0xff, buffer[5]);
  ASSERT.equal(0xff, buffer[6]);
  ASSERT.equal(0xff, buffer[7]);
  ASSERT.equal(0xff, buffer[8]);
  ASSERT.equal(0xff, buffer[9]);
  ASSERT.equal(0xff, buffer[10]);
  ASSERT.equal(0xff, buffer[11]);
  ASSERT.equal(0xff, buffer[12]);
  ASSERT.equal(0xff, buffer[13]);
  ASSERT.equal(0x0f, buffer[14]);
  ASSERT.equal(0x00, buffer[15]);

  buffer.writeDoubleBE(1.0000000000000004, 0);
  buffer.writeDoubleLE(1.0000000000000004, 8);
  ASSERT.equal(0x3f, buffer[0]);
  ASSERT.equal(0xf0, buffer[1]);
  ASSERT.equal(0x00, buffer[2]);
  ASSERT.equal(0x00, buffer[3]);
  ASSERT.equal(0x00, buffer[4]);
  ASSERT.equal(0x00, buffer[5]);
  ASSERT.equal(0x00, buffer[6]);
  ASSERT.equal(0x02, buffer[7]);
  ASSERT.equal(0x02, buffer[8]);
  ASSERT.equal(0x00, buffer[9]);
  ASSERT.equal(0x00, buffer[10]);
  ASSERT.equal(0x00, buffer[11]);
  ASSERT.equal(0x00, buffer[12]);
  ASSERT.equal(0x00, buffer[13]);
  ASSERT.equal(0xf0, buffer[14]);
  ASSERT.equal(0x3f, buffer[15]);

  buffer.writeDoubleBE(-2, 0);
  buffer.writeDoubleLE(-2, 8);
  ASSERT.equal(0xc0, buffer[0]);
  ASSERT.equal(0x00, buffer[1]);
  ASSERT.equal(0x00, buffer[2]);
  ASSERT.equal(0x00, buffer[3]);
  ASSERT.equal(0x00, buffer[4]);
  ASSERT.equal(0x00, buffer[5]);
  ASSERT.equal(0x00, buffer[6]);
  ASSERT.equal(0x00, buffer[7]);
  ASSERT.equal(0x00, buffer[8]);
  ASSERT.equal(0x00, buffer[9]);
  ASSERT.equal(0x00, buffer[10]);
  ASSERT.equal(0x00, buffer[11]);
  ASSERT.equal(0x00, buffer[12]);
  ASSERT.equal(0x00, buffer[13]);
  ASSERT.equal(0x00, buffer[14]);
  ASSERT.equal(0xc0, buffer[15]);

  buffer.writeDoubleBE(1.7976931348623157e+308, 0);
  buffer.writeDoubleLE(1.7976931348623157e+308, 8);
  ASSERT.equal(0x7f, buffer[0]);
  ASSERT.equal(0xef, buffer[1]);
  ASSERT.equal(0xff, buffer[2]);
  ASSERT.equal(0xff, buffer[3]);
  ASSERT.equal(0xff, buffer[4]);
  ASSERT.equal(0xff, buffer[5]);
  ASSERT.equal(0xff, buffer[6]);
  ASSERT.equal(0xff, buffer[7]);
  ASSERT.equal(0xff, buffer[8]);
  ASSERT.equal(0xff, buffer[9]);
  ASSERT.equal(0xff, buffer[10]);
  ASSERT.equal(0xff, buffer[11]);
  ASSERT.equal(0xff, buffer[12]);
  ASSERT.equal(0xff, buffer[13]);
  ASSERT.equal(0xef, buffer[14]);
  ASSERT.equal(0x7f, buffer[15]);

  buffer.writeDoubleBE(0 * -1, 0);
  buffer.writeDoubleLE(0 * -1, 8);
  ASSERT.equal(0x80, buffer[0]);
  ASSERT.equal(0x00, buffer[1]);
  ASSERT.equal(0x00, buffer[2]);
  ASSERT.equal(0x00, buffer[3]);
  ASSERT.equal(0x00, buffer[4]);
  ASSERT.equal(0x00, buffer[5]);
  ASSERT.equal(0x00, buffer[6]);
  ASSERT.equal(0x00, buffer[7]);
  ASSERT.equal(0x00, buffer[8]);
  ASSERT.equal(0x00, buffer[9]);
  ASSERT.equal(0x00, buffer[10]);
  ASSERT.equal(0x00, buffer[11]);
  ASSERT.equal(0x00, buffer[12]);
  ASSERT.equal(0x00, buffer[13]);
  ASSERT.equal(0x00, buffer[14]);
  ASSERT.equal(0x80, buffer[15]);

  buffer.writeDoubleBE(Infinity, 0);
  buffer.writeDoubleLE(Infinity, 8);
  ASSERT.equal(0x7F, buffer[0]);
  ASSERT.equal(0xF0, buffer[1]);
  ASSERT.equal(0x00, buffer[2]);
  ASSERT.equal(0x00, buffer[3]);
  ASSERT.equal(0x00, buffer[4]);
  ASSERT.equal(0x00, buffer[5]);
  ASSERT.equal(0x00, buffer[6]);
  ASSERT.equal(0x00, buffer[7]);
  ASSERT.equal(0x00, buffer[8]);
  ASSERT.equal(0x00, buffer[9]);
  ASSERT.equal(0x00, buffer[10]);
  ASSERT.equal(0x00, buffer[11]);
  ASSERT.equal(0x00, buffer[12]);
  ASSERT.equal(0x00, buffer[13]);
  ASSERT.equal(0xF0, buffer[14]);
  ASSERT.equal(0x7F, buffer[15]);
  ASSERT.equal(Infinity, buffer.readDoubleBE(0));
  ASSERT.equal(Infinity, buffer.readDoubleLE(8));

  buffer.writeDoubleBE(-Infinity, 0);
  buffer.writeDoubleLE(-Infinity, 8);
  ASSERT.equal(0xFF, buffer[0]);
  ASSERT.equal(0xF0, buffer[1]);
  ASSERT.equal(0x00, buffer[2]);
  ASSERT.equal(0x00, buffer[3]);
  ASSERT.equal(0x00, buffer[4]);
  ASSERT.equal(0x00, buffer[5]);
  ASSERT.equal(0x00, buffer[6]);
  ASSERT.equal(0x00, buffer[7]);
  ASSERT.equal(0x00, buffer[8]);
  ASSERT.equal(0x00, buffer[9]);
  ASSERT.equal(0x00, buffer[10]);
  ASSERT.equal(0x00, buffer[11]);
  ASSERT.equal(0x00, buffer[12]);
  ASSERT.equal(0x00, buffer[13]);
  ASSERT.equal(0xF0, buffer[14]);
  ASSERT.equal(0xFF, buffer[15]);
  ASSERT.equal(-Infinity, buffer.readDoubleBE(0));
  ASSERT.equal(-Infinity, buffer.readDoubleLE(8));

  buffer.writeDoubleBE(NaN, 0);
  buffer.writeDoubleLE(NaN, 8);
  // Darwin ia32 does the other kind of NaN.
  // Compiler bug.  No one really cares.
  ASSERT(0x7F === buffer[0] || 0xFF === buffer[0]);
  ASSERT.equal(0xF8, buffer[1]);
  ASSERT.equal(0x00, buffer[2]);
  ASSERT.equal(0x00, buffer[3]);
  ASSERT.equal(0x00, buffer[4]);
  ASSERT.equal(0x00, buffer[5]);
  ASSERT.equal(0x00, buffer[6]);
  ASSERT.equal(0x00, buffer[7]);
  ASSERT.equal(0x00, buffer[8]);
  ASSERT.equal(0x00, buffer[9]);
  ASSERT.equal(0x00, buffer[10]);
  ASSERT.equal(0x00, buffer[11]);
  ASSERT.equal(0x00, buffer[12]);
  ASSERT.equal(0x00, buffer[13]);
  ASSERT.equal(0xF8, buffer[14]);
  // Darwin ia32 does the other kind of NaN.
  // Compiler bug.  No one really cares.
  ASSERT(0x7F === buffer[15] || 0xFF === buffer[15]);
  ASSERT.ok(isNaN(buffer.readDoubleBE(0)));
  ASSERT.ok(isNaN(buffer.readDoubleLE(8)));
}


test(Buffer);
test(SlowBuffer);