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WIP - moving to Buffer internally from Uint8Array, not passing all tests yet.

This commit is contained in:
David Humphrey (:humph) david.humphrey@senecacollege.ca 2014-06-04 15:52:08 -04:00
parent b51957ea77
commit 1914f7a52b
6 changed files with 94 additions and 34 deletions
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34
src/buffer-utils.js Normal file
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@ -0,0 +1,34 @@
/**
* Provide guarantees about Buffer vs. Uint8Array for internal code
* that has a preference.
*
* From the node.js Buffer docs: http://nodejs.org/api/buffer.html#buffer_buffer
*
* "A Buffer object can also be used with typed arrays. The buffer
* object is cloned to an ArrayBuffer that is used as the backing
* store for the typed array. The memory of the buffer and the
* ArrayBuffer is not shared."
*
* In a browser, where we use https://github.com/feross/buffer, a Buffer
* is really a Uint8Array augmented with other methods and properties. As
* such, we do feature detection instead of type identifiation.
*/
function ensureBuffer(maybeBuffer) {
if(!(typeof maybeBuffer.copy === 'function')) {
maybeBuffer = new Buffer(maybeBuffer);
}
return maybeBuffer;
}
function ensureUint8Array(maybeU8) {
if(!('buffer' in maybeU8 && 'byteOffset' in maybeU8 && 'byteLength' in maybeU8)) {
maybeU8 = new Uint8Array(maybeU8);
}
return maybeU8;
}
module.exports = {
ensureBuffer: ensureBuffer,
ensureUint8Array: ensureUint8Array
};

19
src/encoding.js Normal file
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@ -0,0 +1,19 @@
var TextEncoder = require('../lib/encoding.js').TextEncoder;
var TextDecoder = require('../lib/encoding.js').TextDecoder;
var BufferUtils = require('./buffer-utils.js');
// Adapt encodings to work with Buffer or Uint8Array, they expect the latter
function decode(buf) {
buf = BufferUtils.ensureUint8Array(buf);
return (new TextDecoder('utf8')).decode(buf);
}
function encode(string) {
var u8 = (new TextEncoder('utf8')).encode(string);
return BufferUtils.ensureBuffer(u8);
}
module.exports = {
encode: encode,
decode: decode
};

49
src/filesystem/implementation.js
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@ -1,8 +1,5 @@
var _ = require('../../lib/nodash.js');
var TextDecoder = require('../../lib/encoding.js').TextDecoder;
var TextEncoder = require('../../lib/encoding.js').TextEncoder;
var Path = require('../path.js');
var normalize = Path.normalize;
var dirname = Path.dirname;
@ -33,6 +30,8 @@ var XATTR_REPLACE = Constants.XATTR_REPLACE;
var FS_NOMTIME = Constants.FS_NOMTIME;
var FS_NOCTIME = Constants.FS_NOCTIME;
var Encoding = require('../encoding.js');
var BufferUtils = require('../buffer-utils.js');
var Errors = require('../errors.js');
var DirectoryEntry = require('../directory-entry.js');
var OpenFileDescription = require('../open-file-description.js');
@ -641,7 +640,7 @@ function open_file(context, path, flags, callback) {
if(error) {
callback(error);
} else {
fileData = new Uint8Array(0);
fileData = new Buffer(0);
context.put(fileNode.data, fileData, update_directory_data);
}
}
@ -676,6 +675,8 @@ function open_file(context, path, flags, callback) {
function replace_data(context, ofd, buffer, offset, length, callback) {
var fileNode;
buffer = BufferUtils.ensureBuffer(buffer);
function return_nbytes(error) {
if(error) {
callback(error);
@ -706,9 +707,9 @@ function replace_data(context, ofd, buffer, offset, length, callback) {
callback(error);
} else {
fileNode = result;
var newData = new Uint8Array(length);
var bufferWindow = buffer.subarray(offset, offset + length);
newData.set(bufferWindow);
var newData = new Buffer(length);
var bufferWindow = buffer.slice(offset, offset + length);
bufferWindow.copy(newData);
ofd.position = length;
fileNode.size = length;
@ -725,6 +726,8 @@ function write_data(context, ofd, buffer, offset, length, position, callback) {
var fileNode;
var fileData;
buffer = BufferUtils.ensureBuffer(buffer);
function return_nbytes(error) {
if(error) {
callback(error);
@ -757,12 +760,12 @@ function write_data(context, ofd, buffer, offset, length, position, callback) {
fileData = result;
var _position = (!(undefined === position || null === position)) ? position : ofd.position;
var newSize = Math.max(fileData.length, _position + length);
var newData = new Uint8Array(newSize);
var newData = new Buffer(newSize);
if(fileData) {
newData.set(fileData);
newData.copy(fileData);
}
var bufferWindow = buffer.subarray(offset, offset + length);
newData.set(bufferWindow, _position);
var bufferWindow = buffer.slice(offset, offset + length);
bufferWindow.copy(newData, _position);
if(undefined === position) {
ofd.position += length;
}
@ -790,6 +793,8 @@ function read_data(context, ofd, buffer, offset, length, position, callback) {
var fileNode;
var fileData;
buffer = BufferUtils.ensureBuffer(buffer);
function handle_file_data(error, result) {
if(error) {
callback(error);
@ -797,8 +802,8 @@ function read_data(context, ofd, buffer, offset, length, position, callback) {
fileData = result;
var _position = (!(undefined === position || null === position)) ? position : ofd.position;
length = (_position + length > buffer.length) ? length - _position : length;
var dataView = fileData.subarray(_position, _position + length);
buffer.set(dataView, offset);
var dataView = fileData.slice(_position, _position + length);
dataView.copy(buffer, offset);
if(undefined === position) {
ofd.position += length;
}
@ -1182,9 +1187,9 @@ function truncate_file(context, path, length, callback) {
if (error) {
callback(error);
} else {
var data = new Uint8Array(length);
var data = new Buffer(length);
if(fileData) {
data.set(fileData.subarray(0, length));
fileData.copy(data);
}
context.put(fileNode.data, data, update_file_node);
}
@ -1234,9 +1239,11 @@ function ftruncate_file(context, ofd, length, callback) {
if (error) {
callback(error);
} else {
var data = new Uint8Array(length);
var data;
if(fileData) {
data.set(fileData.subarray(0, length));
data = fileData.slice(0, length);
} else {
data = new Buffer(length);
}
context.put(fileNode.data, data, update_file_node);
}
@ -1651,7 +1658,7 @@ function readFile(fs, context, path, options, callback) {
var stats = new Stats(fstatResult, fs.name);
var size = stats.size;
var buffer = new Uint8Array(size);
var buffer = new Buffer(size);
read_data(context, ofd, buffer, 0, size, 0, function(err3, nbytes) {
if(err3) {
@ -1661,7 +1668,7 @@ function readFile(fs, context, path, options, callback) {
var data;
if(options.encoding === 'utf8') {
data = new TextDecoder('utf-8').decode(buffer);
data = Encoding.decode(buffer);
} else {
data = buffer;
}
@ -1704,7 +1711,7 @@ function writeFile(fs, context, path, data, options, callback) {
data = '' + data;
}
if(typeof data === "string" && options.encoding === 'utf8') {
data = new TextEncoder('utf-8').encode(data);
data = Encoding.encode(data);
}
open_file(context, path, flags, function(err, fileNode) {
@ -1740,7 +1747,7 @@ function appendFile(fs, context, path, data, options, callback) {
data = '' + data;
}
if(typeof data === "string" && options.encoding === 'utf8') {
data = new TextEncoder('utf-8').encode(data);
data = Encoding.encode(data);
}
open_file(context, path, flags, function(err, fileNode) {

6
tests/spec/fs.appendFile.spec.js
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@ -72,10 +72,10 @@ describe('fs.appendFile', function() {
// String and utf8 binary encoded versions of the same thing:
var contents = "This is a file.";
var binary = new Uint8Array([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46]);
var binary = new Buffer([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46]);
var more = " Appended.";
var binary2 = new Uint8Array([32, 65, 112, 112, 101, 110, 100, 101, 100, 46]);
var binary3 = new Uint8Array([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46,
var binary2 = new Buffer([32, 65, 112, 112, 101, 110, 100, 101, 100, 46]);
var binary3 = new Buffer([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46,
32, 65, 112, 112, 101, 110, 100, 101, 100, 46]);
fs.writeFile('/mybinaryfile', binary, function(error) {

14
tests/spec/fs.truncate.spec.js
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@ -38,8 +38,8 @@ describe('fs.truncate', function() {
it('should truncate a file', function(done) {
var fs = util.fs();
var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
var truncated = new Uint8Array([1]);
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
var truncated = new Buffer([1]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
@ -68,8 +68,8 @@ describe('fs.truncate', function() {
it('should pad a file with zeros when the length is greater than the file size', function(done) {
var fs = util.fs();
var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
var truncated = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 0]);
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
var truncated = new Buffer([1, 2, 3, 4, 5, 6, 7, 8, 0]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
@ -98,7 +98,7 @@ describe('fs.truncate', function() {
it('should update the file size', function(done) {
var fs = util.fs();
var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
@ -127,7 +127,7 @@ describe('fs.truncate', function() {
it('should truncate a valid descriptor', function(done) {
var fs = util.fs();
var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;
@ -152,7 +152,7 @@ describe('fs.truncate', function() {
it('should follow symbolic links', function(done) {
var fs = util.fs();
var buffer = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8]);
var buffer = new Buffer([1, 2, 3, 4, 5, 6, 7, 8]);
fs.open('/myfile', 'w', function(error, result) {
if(error) throw error;

2
tests/spec/fs.writeFile-readFile.spec.js
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@ -70,7 +70,7 @@ describe('fs.writeFile, fs.readFile', function() {
var fs = util.fs();
// String and utf8 binary encoded versions of the same thing:
var contents = "This is a file.";
var binary = new Uint8Array([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46]);
var binary = new Buffer([84, 104, 105, 115, 32, 105, 115, 32, 97, 32, 102, 105, 108, 101, 46]);
fs.writeFile('/myfile', binary, function(error) {
if(error) throw error;