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https://github.com/id-Software/wolf3d-browser.git
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Wolfenstein 3D browser version
This is the code for the browser version of Wolfenstein 3D which is playable on http://www.wolfenstein.com/game_NA.php
This commit is contained in:
Brian Harris
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js/file.js
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217
js/file.js
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/*
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* ===========================================================================
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*
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* Wolf3D Browser Version GPL Source Code
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* Copyright (C) 2012 id Software LLC, a ZeniMax Media company.
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*
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* This file is part of the Wolf3D Browser Version GPL Source Code ("Wolf3D Browser Source Code").
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*
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* Wolf3D Browser Source Code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* Wolf3D Browser Source Code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License version 2
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* along with Wolf3D Browser Source Code. If not, see <http://www.gnu.org/licenses/>.
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*
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* If you have questions concerning this license, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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*
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* ===========================================================================
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*/
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/**
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* @namespace
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* @description Binary file reading
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*/
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Wolf.File = (function() {
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/**
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* @description Open a file from URL
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* @memberOf Wolf.File
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* @param {string} url The URL to open
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* @param {function} callback Is called when file has been loaded. Second argument is file obj.
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*/
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function openURL(url, callback) {
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var xhr = new XMLHttpRequest();
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xhr.onreadystatechange = function() {
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if (xhr.readyState == 4) {
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if (xhr.status >= 200 && xhr.status < 300 || xhr.status == 0) {
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callback(null, {
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data : xhr.responseText,
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size : xhr.responseText.length,
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position : 0
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});
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} else {
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callback(new Error("Server returned HTTP status: " + xhr.status));
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}
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}
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}
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xhr.open("GET", url, true);
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xhr.overrideMimeType('text/plain; charset=x-user-defined');
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xhr.send(null);
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}
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function atob(str) {
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str = str.replace(/=+$/, "");
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var b64chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
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a, b, c, b1, b2, b3, b4,
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chr = String.fromCharCode,
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out = [];
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for (var i=0,len=str.length;i<len;) {
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b1 = b64chars.indexOf(str.charAt(i++));
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b2 = b64chars.indexOf(str.charAt(i++));
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b3 = b64chars.indexOf(str.charAt(i++));
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b4 = b64chars.indexOf(str.charAt(i++));
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a = ((b1 & 0x3F) << 2) | ((b2 >> 4) & 0x3);
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b = ((b2 & 0xF) << 4) | ((b3 >> 2) & 0xF);
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c = ((b3 & 0x3) << 6) | (b4 & 0x3F);
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out.push(chr(a), chr(b), chr(c));
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}
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return out.join("");
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}
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/**
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* @description Open a file from base64 filetable
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* @memberOf Wolf.File
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* @param {string} filename The name of the file to open
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* @param {object} files The filetable
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* @param {function} callback Is called when file has been loaded. Second argument is file obj.
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*/
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function open(filename, files, callback) {
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var b64data = files[filename];
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if (b64data) {
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var data = atob(b64data);
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callback(null, {
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data : data,
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size : data.length,
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position : 0
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});
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} else {
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callback(new Error("File not found: " + filename));
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}
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}
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/**
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* @description Read an unsigned 8-bit integer from a file and advance the file position.
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* @memberOf Wolf.File
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* @param {object} f The file
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* @returns {number}
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*/
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function readUInt8(f) {
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var b = f.data.charCodeAt(f.position) & 0xFF
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f.position++;
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return b;
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}
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/**
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* @description Read a signed 8-bit integer from a file and advance the file position.
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* @memberOf Wolf.File
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* @param {object} f The file
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* @returns {number}
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*/
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function readInt8(f) {
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var v = readUInt8(f);
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return v > 127 ? v - 256 : v;
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}
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/**
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* @description Read an unsigned 16-bit integer from a file and advance the file position.
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* @memberOf Wolf.File
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* @param {object} f The file
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* @returns {number}
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*/
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function readUInt16(f) {
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var v = readUInt8(f) + (readUInt8(f) << 8);
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return (v < 0) ? v + 0x10000 : v;
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}
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/**
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* @description Read a signed 16-bit integer from a file and advance the file position.
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* @memberOf Wolf.File
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* @param {object} f The file
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* @returns {number}
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*/
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function readInt16(f) {
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var v = readUInt16(f);
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return (v > 0x7fff) ? v - 0x10000 : v;
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}
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/**
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* @description Read an unsigned 32-bit integer from a file and advance the file position.
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* @memberOf Wolf.File
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* @param {object} f The file
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* @returns {number}
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*/
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function readUInt32(f) {
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var b0 = readUInt8(f),
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b1 = readUInt8(f),
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b2 = readUInt8(f),
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b3 = readUInt8(f),
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v = ((((b3 << 8) + b2) << 8) + b1 << 8) + b0;
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return (v < 0) ? v + 0x100000000 : v;
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}
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/**
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* @description Read a signed 32-bit int from a file and advance the file position.
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* @memberOf Wolf.File
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* @param {object} f The file
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* @returns {number}
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*/
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function readInt32(f) {
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var v = readUInt32(f);
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return (v > 0x7fffffff) ? v - 0x100000000 : v;
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}
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/**
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* @description Read a string from a file and advance the file position.
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* @memberOf Wolf.File
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* @param {object} f The file
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* @param {number} length The length of the string
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* @returns {string}
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*/
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function readString(f, length) {
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var str = f.data.substr(f.position, length);
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f.position += length;
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return str;
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}
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/**
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* @description Read an array of bytes a file and advance the file position.
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* @memberOf Wolf.File
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* @param {object} f The file
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* @param {number} num The number of bytes to read
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* @returns {array}
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*/
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function readBytes(f, num) {
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var b = [];
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for (var i=0;i<num;i++) {
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b[i] = f.data.charCodeAt(f.position+i) & 0xFF;
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}
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f.position += num;
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return b;
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}
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return {
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open : open,
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readInt8 : readInt8,
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readUInt8 : readUInt8,
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readInt16 : readInt16,
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readUInt16 : readUInt16,
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readInt32 : readInt32,
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readUInt32 : readUInt32,
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readBytes : readBytes,
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readString : readString
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};
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})();
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