Add download

index.js

@@ -2,40 +2,28 @@
 
 const path = require('path');
 
-
-const rootPath = __dirname.replace(/\\/g, '/');
-
-const nanInclude = path.dirname(require.resolve('nan')).replace(/\\/g, '/');
-const thisInclude = `${rootPath}/include`;
+const download = require('./js/download');
 
 
-const isWindows = process.platform === 'win32';
-
-const names = ['win32', 'win64', 'linux32', 'linux64', 'mac64'];
+const NAMES = ['win32', 'win64', 'linux64', 'mac64'];
 
 const prefixName = name => `bin-${name}`;
 
-const getPlatformDir = platform => {
-	switch (platform) {
+const getPlatformDir = () => {
+	switch (process.platform) {
 		case 'win32'  : return process.arch === 'x64' ? 'win64' : 'win32';
-		case 'linux' :
-			if (process.arch === 'x32') {
-				throw new Error('Linux x32 not supported since 4.0.0.');
-			}
-			return 'linux64';
-		case 'darwin' :
-			if (process.arch === 'x32') {
-				throw new Error('Mac x32 not supported.');
-			}
-			return 'mac64';
-		default : throw new Error(`Platform "${platform}" is not supported.`);
+		case 'linux'  : return 'linux64';
+		case 'darwin' : return 'mac64';
+		default : throw new Error(`Platform "${process.platform}" is not supported.`);
 	}
 };
 
-
-const currentDir = prefixName(getPlatformDir(process.platform));
-const remDirs = names.map(prefixName).filter(n => n !== currentDir);
-
+const rootPath = __dirname.replace(/\\/g, '/');
+const nanInclude = path.dirname(require.resolve('nan')).replace(/\\/g, '/');
+const thisInclude = `${rootPath}/include`;
+const isWindows = process.platform === 'win32';
+const currentDir = prefixName(getPlatformDir());
+const remDirs = NAMES.map(prefixName).filter(n => n !== currentDir);
 
 const paths = dir => {
 	
@@ -68,9 +56,9 @@ const paths = dir => {
 const includePath = `${nanInclude} ${thisInclude}`;
 const binPath = currentDir;
 
-const mkdirPath = isWindows ? `${rootPath}/_mkdir.bat` : 'mkdir';
-const rmPath    = isWindows ? `${rootPath}/_rm.bat` : 'rm';
-const cpPath    = isWindows ? `${rootPath}/_cp.bat` : 'cp';
+const mkdirPath = isWindows ? `${rootPath}/bat/mkdir.bat` : 'mkdir';
+const rmPath    = isWindows ? `${rootPath}/bat/rm.bat` : 'rm';
+const cpPath    = isWindows ? `${rootPath}/bat/cp.bat` : 'cp';
 
 
 module.exports = {

js/download.js

@@ -0,0 +1,30 @@
+'use strict';
+
+const https = require('https');
+const http  = require('http');
+
+const WritableBuffer = require('./writable-buffer');
+
+
+const protocols = { http, https };
+
+
+module.exports = url => new Promise(
+	(res, rej) => {
+		
+		url = url.toLowerCase();
+		
+		const stream = new WritableBuffer();
+		const proto  = protocols[url.match(/^https?/)[0]];
+		
+		proto.get(url, response => {
+			
+			response.pipe(stream);
+			
+			response.on('end', () => res(stream.get()));
+			response.on('error', err => rej(err));
+			
+		});
+		
+	}
+);

js/writable-buffer.js

@@ -0,0 +1,65 @@
+'use strict';
+
+const { Writable } = require('stream');
+
+const CHUNK_SIZE = 1024;
+const INITIAL_SIZE = 8 * CHUNK_SIZE;
+const INCREMENT_SIZE = 8 * CHUNK_SIZE;
+
+
+class WritableBuffer extends Writable {
+	
+	constructor() {
+		
+		super();
+		
+		this._buffer = new Buffer(INITIAL_SIZE);
+		this._size = 0;
+		
+	}
+	
+	get() {
+		
+		if ( ! this._size ) {
+			return null;
+		}
+		
+		const data = new Buffer(this._size);
+		this._buffer.copy(data, 0, 0, this._size);
+		
+		return data;
+		
+	}
+	
+	
+	_increaseAsNeeded(incomingSize) {
+		
+		if ( (this._buffer.length - this._size) >= incomingSize ) {
+			return;
+		}
+		
+		const freeSpace = this._buffer.length - this._size;
+		const factor = Math.ceil((incomingSize - freeSpace) / INCREMENT_SIZE);
+		
+		const newBuffer = new Buffer(this._buffer.length + (INCREMENT_SIZE * factor));
+		this._buffer.copy(newBuffer, 0, 0, this._size);
+		
+		this._buffer = newBuffer;
+		
+	}
+	
+	
+	_write(chunk, encoding, callback) {
+		
+		this._increaseAsNeeded(chunk.length);
+		
+		chunk.copy(this._buffer, this._size, 0);
+		this._size += chunk.length;
+		
+		callback();
+		
+	}
+	
+}
+
+module.exports = WritableBuffer;