103 lines
3.3 KiB
JavaScript
103 lines
3.3 KiB
JavaScript
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'use strict';
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const assert = require('assert');
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const ref = require('../');
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describe('C string', function() {
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describe('readCString()', function() {
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it('should return "" for a Buffer containing "\\0"', function() {
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const buf = Buffer.from('\0');
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assert.strictEqual('', buf.readCString(0));
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});
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it('should return "hello" for a Buffer containing "hello\\0world"', function() {
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const buf = Buffer.from('hello\0world');
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assert.strictEqual('hello', buf.readCString(0));
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});
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it('should throw an Error when reading from the NULL pointer', function() {
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assert.throws(() => {
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ref.NULL.readCString();
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});
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});
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});
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describe('writeCString()', function() {
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it('should write a C string (NULL terminated) to a Buffer', function() {
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const buf = Buffer.alloc(20);
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const str = 'hello world';
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buf.writeCString(str);
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for (let i = 0; i < str.length; i++) {
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assert.strictEqual(str.charCodeAt(i), buf[i]);
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}
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assert.strictEqual(0, buf[str.length]);
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});
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it('should not write the terminating 0 out of bounds', function() {
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const wholebuf = Buffer.alloc(20, 127);
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const buf = wholebuf.subarray(0, 10);
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const str = 'hello world';
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buf.writeCString(str);
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for (let i = 0; i < buf.length - 1; i++) {
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assert.strictEqual(str.charCodeAt(i), buf[i]);
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}
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assert.strictEqual(0, buf[buf.length - 1]);
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for (let i = buf.length; i < wholebuf.length; i++) {
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assert.strictEqual(127, wholebuf[i]);
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}
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});
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});
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describe('allocCString()', function() {
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it('should return a new Buffer containing the given string', function() {
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const buf = ref.allocCString('hello world');
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assert.strictEqual('hello world', buf.readCString());
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});
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it('should return the NULL pointer for `null` values', function() {
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const buf = ref.allocCString(null);
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assert(buf.isNull());
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assert.strictEqual(0, buf.address());
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});
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it('should return the NULL pointer for `undefined` values', function() {
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const buf = ref.allocCString(undefined);
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assert(buf.isNull());
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assert.strictEqual(0, buf.address());
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});
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it('should return the NULL pointer for a NULL pointer Buffer', function() {
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const buf = ref.allocCString(ref.NULL);
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assert(buf.isNull());
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assert.strictEqual(0, buf.address());
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})
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});
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describe('CString', function() {
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it('should return JS `null` when given a pointer pointing to NULL', function() {
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const buf = ref.alloc(ref.types.CString);
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buf.writePointer(ref.NULL);
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assert.strictEqual(null, buf.deref());
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// another version of the same test
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assert.strictEqual(null, ref.get(ref.NULL_POINTER, 0, ref.types.CString));
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});
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it('should read a utf8 string from a Buffer', function() {
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const str = 'hello world';
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const buf = ref.alloc(ref.types.CString);
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buf.writePointer(Buffer.from(str + '\0'));
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assert.strictEqual(str, buf.deref());
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});
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// https://github.com/node-ffi/node-ffi/issues/169
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it('should set a Buffer as backing store', function() {
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const str = 'hey!';
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const store = Buffer.from(str + '\0');
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const buf = ref.alloc(ref.types.CString);
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ref.set(buf, 0, store);
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assert.strictEqual(str, ref.get(buf, 0));
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});
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});
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});
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