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/*
* A battery of tests to help us read a series of uints
*/
var ASSERT = require('assert');
/*
* We need to check the following things:
* - We are correctly resolving big endian (doesn't mean anything for 8 bit)
* - Correctly resolving little endian (doesn't mean anything for 8 bit)
* - Correctly using the offsets
* - Correctly interpreting values that are beyond the signed range as unsigned
*/
function test8() {
var data = new Buffer(4);
data[0] = 23;
data[1] = 23;
data[2] = 23;
data[3] = 23;
ASSERT.equal(23, data.readUInt8(0, 'big'));
ASSERT.equal(23, data.readUInt8(0, 'little'));
ASSERT.equal(23, data.readUInt8(1, 'big'));
ASSERT.equal(23, data.readUInt8(1, 'little'));
ASSERT.equal(23, data.readUInt8(2, 'big'));
ASSERT.equal(23, data.readUInt8(2, 'little'));
ASSERT.equal(23, data.readUInt8(3, 'big'));
ASSERT.equal(23, data.readUInt8(3, 'little'));
data[0] = 255; /* If it became a signed int, would be -1 */
ASSERT.equal(255, data.readUInt8(0, 'big'));
ASSERT.equal(255, data.readUInt8(0, 'little'));
}
/*
* Test 16 bit unsigned integers. We need to verify the same set as 8 bit, only
* now some of the issues actually matter:
* - We are correctly resolving big endian
* - Correctly resolving little endian
* - Correctly using the offsets
* - Correctly interpreting values that are beyond the signed range as unsigned
*/
function test16() {
var data = new Buffer(4);
data[0] = 0;
data[1] = 0x23;
data[2] = 0x42;
data[3] = 0x3f;
ASSERT.equal(0x23, data.readUInt16(0, 'big'));
ASSERT.equal(0x2342, data.readUInt16(1, 'big'));
ASSERT.equal(0x423f, data.readUInt16(2, 'big'));
ASSERT.equal(0x2300, data.readUInt16(0, 'little'));
ASSERT.equal(0x4223, data.readUInt16(1, 'little'));
ASSERT.equal(0x3f42, data.readUInt16(2, 'little'));
data[0] = 0xfe;
data[1] = 0xfe;
ASSERT.equal(0xfefe, data.readUInt16(0, 'big'));
ASSERT.equal(0xfefe, data.readUInt16(0, 'little'));
}
/*
* Test 32 bit unsigned integers. We need to verify the same set as 8 bit, only
* now some of the issues actually matter:
* - We are correctly resolving big endian
* - Correctly using the offsets
* - Correctly interpreting values that are beyond the signed range as unsigned
*/
function test32() {
var data = new Buffer(8);
data[0] = 0x32;
data[1] = 0x65;
data[2] = 0x42;
data[3] = 0x56;
data[4] = 0x23;
data[5] = 0xff;
ASSERT.equal(0x32654256, data.readUInt32(0, 'big'));
ASSERT.equal(0x65425623, data.readUInt32(1, 'big'));
ASSERT.equal(0x425623ff, data.readUInt32(2, 'big'));
ASSERT.equal(0x56426532, data.readUInt32(0, 'little'));
ASSERT.equal(0x23564265, data.readUInt32(1, 'little'));
ASSERT.equal(0xff235642, data.readUInt32(2, 'little'));
}
test8();
test16();
test32();