test/parallel/test-readint.js

   1 /*
   2  * Tests to verify we're reading in signed integers correctly
   3  */
   4 var common = require('../common');
   5 var ASSERT = require('assert');
   6
   7 /*
   8  * Test 8 bit signed integers
   9  */
  10 function test8(clazz) {
  11   var data = new clazz(4);
  12
  13   data[0] = 0x23;
  14   ASSERT.equal(0x23, data.readInt8(0));
  15
  16   data[0] = 0xff;
  17   ASSERT.equal(-1, data.readInt8(0));
  18
  19   data[0] = 0x87;
  20   data[1] = 0xab;
  21   data[2] = 0x7c;
  22   data[3] = 0xef;
  23   ASSERT.equal(-121, data.readInt8(0));
  24   ASSERT.equal(-85, data.readInt8(1));
  25   ASSERT.equal(124, data.readInt8(2));
  26   ASSERT.equal(-17, data.readInt8(3));
  27 }
  28
  29
  30 function test16(clazz) {
  31   var buffer = new clazz(6);
  32
  33   buffer[0] = 0x16;
  34   buffer[1] = 0x79;
  35   ASSERT.equal(0x1679, buffer.readInt16BE(0));
  36   ASSERT.equal(0x7916, buffer.readInt16LE(0));
  37
  38   buffer[0] = 0xff;
  39   buffer[1] = 0x80;
  40   ASSERT.equal(-128, buffer.readInt16BE(0));
  41   ASSERT.equal(-32513, buffer.readInt16LE(0));
  42
  43   /* test offset with weenix */
  44   buffer[0] = 0x77;
  45   buffer[1] = 0x65;
  46   buffer[2] = 0x65;
  47   buffer[3] = 0x6e;
  48   buffer[4] = 0x69;
  49   buffer[5] = 0x78;
  50   ASSERT.equal(0x7765, buffer.readInt16BE(0));
  51   ASSERT.equal(0x6565, buffer.readInt16BE(1));
  52   ASSERT.equal(0x656e, buffer.readInt16BE(2));
  53   ASSERT.equal(0x6e69, buffer.readInt16BE(3));
  54   ASSERT.equal(0x6978, buffer.readInt16BE(4));
  55   ASSERT.equal(0x6577, buffer.readInt16LE(0));
  56   ASSERT.equal(0x6565, buffer.readInt16LE(1));
  57   ASSERT.equal(0x6e65, buffer.readInt16LE(2));
  58   ASSERT.equal(0x696e, buffer.readInt16LE(3));
  59   ASSERT.equal(0x7869, buffer.readInt16LE(4));
  60 }
  61
  62
  63 function test32(clazz) {
  64   var buffer = new clazz(6);
  65
  66   buffer[0] = 0x43;
  67   buffer[1] = 0x53;
  68   buffer[2] = 0x16;
  69   buffer[3] = 0x79;
  70   ASSERT.equal(0x43531679, buffer.readInt32BE(0));
  71   ASSERT.equal(0x79165343, buffer.readInt32LE(0));
  72
  73   buffer[0] = 0xff;
  74   buffer[1] = 0xfe;
  75   buffer[2] = 0xef;
  76   buffer[3] = 0xfa;
  77   ASSERT.equal(-69638, buffer.readInt32BE(0));
  78   ASSERT.equal(-84934913, buffer.readInt32LE(0));
  79
  80   buffer[0] = 0x42;
  81   buffer[1] = 0xc3;
  82   buffer[2] = 0x95;
  83   buffer[3] = 0xa9;
  84   buffer[4] = 0x36;
  85   buffer[5] = 0x17;
  86   ASSERT.equal(0x42c395a9, buffer.readInt32BE(0));
  87   ASSERT.equal(-1013601994, buffer.readInt32BE(1));
  88   ASSERT.equal(-1784072681, buffer.readInt32BE(2));
  89   ASSERT.equal(-1449802942, buffer.readInt32LE(0));
  90   ASSERT.equal(917083587, buffer.readInt32LE(1));
  91   ASSERT.equal(389458325, buffer.readInt32LE(2));
  92 }
  93
  94
  95 test8(Buffer);
  96 test16(Buffer);
  97 test32(Buffer);