plupload/tests/js/FileHash.js

Plupload is a JavaScript API for dealing with file uploads it supports features like multiple file selection, file type filtering, request chunking, client side image scaling and it uses different runtimes to achieve this such as HTML 5, Silverlight and F

;(function() {

var hasBlobConstructor = (function() {
	try {
        return !!new Blob();
    } catch (e) {
        return false;
    }
}());


var BlobBuilder = (function() {
	return window.MozBlobBuilder || window.WebKitBlobBuilder || window.BlobBuilder;
}());


window.FileHash = new (function() {
	var _options = {}
	, _filesAdded = 0
	, _nativeFiles = []
	, _runtimeFiles = []
	;
	
	return  {

		init: function(options) {
			var scripts = '';

			_options = options;

			if (typeof _options.files === 'string') {
				_options.files = [_options.files];
			}

			for (var i = 0; i < _options.files.length; i++) {
				scripts += '<script type="text/javascript" src="' + _options.files[i] + '"></script>\n';
			}
			document.write(scripts);
		},


		add: function(fileData) {
			var type = fileData.type || ''
			, binStr = window.atob(fileData.data)
			;

			// add native file where possible
			if (hasBlobConstructor) {
				_nativeFiles.push({
					name: fileData.name,
					blob: new Blob([binStr], { type: type })
				});
			} else if (BlobBuilder) {
				var bb = new BlobBuilder();
				bb.append(binStr);
				_nativeFiles.push({
					name: fileData.name,
					blob: bb.getBlob(type)
				});
			}

			// add runtime version
			if (window.o && window.o.File) {
				_runtimeFiles.push(new o.File(null, {
					name: fileData.name,
					type: type,
					data: binStr
				}));
			}

			_filesAdded++;

			if (_filesAdded == _options.files.length && _options.onready) {
				_options.onready.call(this);
			}
		},


		getNativeFiles: function() {
			return _nativeFiles;
		},


		getRuntimeFiles: function() {
			var files = [];
			// return fresh set
			o.each(_runtimeFiles, function(file) {
				files.push(new o.File(null, {
					name: file.name,
					data: file.getSource()
				}));
			});
			return files;
		},

		getEmptyFile: function(fileName) {
			return new o.File(null, {
				name: fileName || o.guid('file_') + '.zip',
				size: 0
			});
		}
	};
});


}());