Changed backend for comic reader, now supports rar5

cps/static/js/compress/libuntar.js

@@ -0,0 +1,90 @@
+// Copyright (c) 2017 Matthew Brennan Jones <matthew.brennan.jones@gmail.com>
+// This software is licensed under a MIT License
+// https://github.com/workhorsy/uncompress.js
+
+"use strict";
+
+// Based on the information from:
+// https://en.wikipedia.org/wiki/Tar_(computing)
+
+
+(function() {
+
+const TAR_TYPE_FILE = 0;
+const TAR_TYPE_DIR = 5;
+
+const TAR_HEADER_SIZE = 512;
+const TAR_TYPE_OFFSET = 156;
+const TAR_TYPE_SIZE = 1;
+const TAR_SIZE_OFFSET = 124;
+const TAR_SIZE_SIZE = 12;
+const TAR_NAME_OFFSET = 0;
+const TAR_NAME_SIZE = 100;
+
+function _tarRead(view, offset, size) {
+	return view.slice(offset, offset + size);
+}
+
+function tarGetEntries(filename, array_buffer) {
+	let view = new Uint8Array(array_buffer);
+	let offset = 0;
+	let entries = [];
+
+	while (offset + TAR_HEADER_SIZE < view.byteLength) {
+		// Get entry name
+		let entry_name = saneMap(_tarRead(view, offset + TAR_NAME_OFFSET, TAR_NAME_SIZE), String.fromCharCode);
+		entry_name = entry_name.join('').replace(/\0/g, '');
+
+		// No entry name, so probably the last block
+		if (entry_name.length === 0) {
+			break;
+		}
+
+		// Get entry size
+		let entry_size = parseInt(saneJoin(saneMap(_tarRead(view, offset + TAR_SIZE_OFFSET, TAR_SIZE_SIZE), String.fromCharCode), ''), 8);
+		let entry_type = saneMap(_tarRead(view, offset + TAR_TYPE_OFFSET, TAR_TYPE_SIZE), String.fromCharCode) | 0;
+
+		// Save this as en entry if it is a file or directory
+		if (entry_type === TAR_TYPE_FILE || entry_type === TAR_TYPE_DIR) {
+			let entry = {
+				name: entry_name,
+				size: entry_size,
+				is_file: entry_type == TAR_TYPE_FILE,
+				offset: offset
+			};
+			entries.push(entry);
+		}
+
+		// Round the offset up to be divisible by TAR_HEADER_SIZE
+		offset += (entry_size + TAR_HEADER_SIZE);
+		if (offset % TAR_HEADER_SIZE > 0) {
+			let even = (offset / TAR_HEADER_SIZE) | 0; // number of times it goes evenly into TAR_HEADER_SIZE
+			offset = (even + 1) * TAR_HEADER_SIZE;
+		}
+	}
+
+	return entries;
+}
+
+function tarGetEntryData(entry, array_buffer) {
+	let view = new Uint8Array(array_buffer);
+	let offset = entry.offset;
+	let size = entry.size;
+
+	// Get entry data
+	let entry_data = _tarRead(view, offset + TAR_HEADER_SIZE, size);
+	return entry_data;
+}
+
+// Figure out if we are running in a Window or Web Worker
+let scope = null;
+if (typeof window === 'object') {
+	scope = window;
+} else if (typeof importScripts === 'function') {
+	scope = self;
+}
+
+// Set exports
+scope.tarGetEntries = tarGetEntries;
+scope.tarGetEntryData = tarGetEntryData;
+})();