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files_reader/js/libs/zip-ext.js

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+/*
+ Copyright (c) 2013 Gildas Lormeau. All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+
+ 2. Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the distribution.
+
+ 3. The names of the authors may not be used to endorse or promote products
+ derived from this software without specific prior written permission.
+
+ THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
+ INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
+ INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
+ INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+(function() {
+
+	var ERR_HTTP_RANGE = "HTTP Range not supported.";
+
+	var Reader = zip.Reader;
+	var Writer = zip.Writer;
+	
+	var ZipDirectoryEntry;
+
+	var appendABViewSupported;
+	try {
+		appendABViewSupported = new Blob([ new DataView(new ArrayBuffer(0)) ]).size === 0;
+	} catch (e) {
+	}
+
+	function HttpReader(url) {
+		var that = this;
+
+		function getData(callback, onerror) {
+			var request;
+			if (!that.data) {
+				request = new XMLHttpRequest();
+				request.addEventListener("load", function() {
+					if (!that.size)
+						that.size = Number(request.getResponseHeader("Content-Length"));
+					that.data = new Uint8Array(request.response);
+					callback();
+				}, false);
+				request.addEventListener("error", onerror, false);
+				request.open("GET", url);
+				request.responseType = "arraybuffer";
+				request.send();
+			} else
+				callback();
+		}
+
+		function init(callback, onerror) {
+			var request = new XMLHttpRequest();
+			request.addEventListener("load", function() {
+				that.size = Number(request.getResponseHeader("Content-Length"));
+				callback();
+			}, false);
+			request.addEventListener("error", onerror, false);
+			request.open("HEAD", url);
+			request.send();
+		}
+
+		function readUint8Array(index, length, callback, onerror) {
+			getData(function() {
+				callback(new Uint8Array(that.data.subarray(index, index + length)));
+			}, onerror);
+		}
+
+		that.size = 0;
+		that.init = init;
+		that.readUint8Array = readUint8Array;
+	}
+	HttpReader.prototype = new Reader();
+	HttpReader.prototype.constructor = HttpReader;
+
+	function HttpRangeReader(url) {
+		var that = this;
+
+		function init(callback, onerror) {
+			var request = new XMLHttpRequest();
+			request.addEventListener("load", function() {
+				that.size = Number(request.getResponseHeader("Content-Length"));
+				if (request.getResponseHeader("Accept-Ranges") == "bytes")
+					callback();
+				else
+					onerror(ERR_HTTP_RANGE);
+			}, false);
+			request.addEventListener("error", onerror, false);
+			request.open("HEAD", url);
+			request.send();
+		}
+
+		function readArrayBuffer(index, length, callback, onerror) {
+			var request = new XMLHttpRequest();
+			request.open("GET", url);
+			request.responseType = "arraybuffer";
+			request.setRequestHeader("Range", "bytes=" + index + "-" + (index + length - 1));
+			request.addEventListener("load", function() {
+				callback(request.response);
+			}, false);
+			request.addEventListener("error", onerror, false);
+			request.send();
+		}
+
+		function readUint8Array(index, length, callback, onerror) {
+			readArrayBuffer(index, length, function(arraybuffer) {
+				callback(new Uint8Array(arraybuffer));
+			}, onerror);
+		}
+
+		that.size = 0;
+		that.init = init;
+		that.readUint8Array = readUint8Array;
+	}
+	HttpRangeReader.prototype = new Reader();
+	HttpRangeReader.prototype.constructor = HttpRangeReader;
+
+	function ArrayBufferReader(arrayBuffer) {
+		var that = this;
+
+		function init(callback, onerror) {
+			that.size = arrayBuffer.byteLength;
+			callback();
+		}
+
+		function readUint8Array(index, length, callback, onerror) {
+			callback(new Uint8Array(arrayBuffer.slice(index, index + length)));
+		}
+
+		that.size = 0;
+		that.init = init;
+		that.readUint8Array = readUint8Array;
+	}
+	ArrayBufferReader.prototype = new Reader();
+	ArrayBufferReader.prototype.constructor = ArrayBufferReader;
+
+	function ArrayBufferWriter() {
+		var array, that = this;
+
+		function init(callback, onerror) {
+			array = new Uint8Array();
+			callback();
+		}
+
+		function writeUint8Array(arr, callback, onerror) {
+			var tmpArray = new Uint8Array(array.length + arr.length);
+			tmpArray.set(array);
+			tmpArray.set(arr, array.length);
+			array = tmpArray;
+			callback();
+		}
+
+		function getData(callback) {
+			callback(array.buffer);
+		}
+
+		that.init = init;
+		that.writeUint8Array = writeUint8Array;
+		that.getData = getData;
+	}
+	ArrayBufferWriter.prototype = new Writer();
+	ArrayBufferWriter.prototype.constructor = ArrayBufferWriter;
+
+	function FileWriter(fileEntry, contentType) {
+		var writer, that = this;
+
+		function init(callback, onerror) {
+			fileEntry.createWriter(function(fileWriter) {
+				writer = fileWriter;
+				callback();
+			}, onerror);
+		}
+
+		function writeUint8Array(array, callback, onerror) {
+			var blob = new Blob([ appendABViewSupported ? array : array.buffer ], {
+				type : contentType
+			});
+			writer.onwrite = function() {
+				writer.onwrite = null;
+				callback();
+			};
+			writer.onerror = onerror;
+			writer.write(blob);
+		}
+
+		function getData(callback) {
+			fileEntry.file(callback);
+		}
+
+		that.init = init;
+		that.writeUint8Array = writeUint8Array;
+		that.getData = getData;
+	}
+	FileWriter.prototype = new Writer();
+	FileWriter.prototype.constructor = FileWriter;
+
+	zip.FileWriter = FileWriter;
+	zip.HttpReader = HttpReader;
+	zip.HttpRangeReader = HttpRangeReader;
+	zip.ArrayBufferReader = ArrayBufferReader;
+	zip.ArrayBufferWriter = ArrayBufferWriter;
+
+	if (zip.fs) {
+		ZipDirectoryEntry = zip.fs.ZipDirectoryEntry;
+		ZipDirectoryEntry.prototype.addHttpContent = function(name, URL, useRangeHeader) {
+			function addChild(parent, name, params, directory) {
+				if (parent.directory)
+					return directory ? new ZipDirectoryEntry(parent.fs, name, params, parent) : new zip.fs.ZipFileEntry(parent.fs, name, params, parent);
+				else
+					throw "Parent entry is not a directory.";
+			}
+
+			return addChild(this, name, {
+				data : URL,
+				Reader : useRangeHeader ? HttpRangeReader : HttpReader
+			});
+		};
+		ZipDirectoryEntry.prototype.importHttpContent = function(URL, useRangeHeader, onend, onerror) {
+			this.importZip(useRangeHeader ? new HttpRangeReader(URL) : new HttpReader(URL), onend, onerror);
+		};
+		zip.fs.FS.prototype.importHttpContent = function(URL, useRangeHeader, onend, onerror) {
+			this.entries = [];
+			this.root = new ZipDirectoryEntry(this);
+			this.root.importHttpContent(URL, useRangeHeader, onend, onerror);
+		};
+	}
+
+})();