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