Sakurai/pdf.js
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Refactoring Settings manager, now with limit on memory usage

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This commit is contained in:
Saebekassebil 2011-12-26 15:07:24 +01:00
parent 4c064eb94a
commit e147485262
2 changed files with 67 additions and 48 deletions
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10
src/core.js
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@ -527,8 +527,7 @@ var PDFDocModel = (function PDFDocModelClosure() {
this.startXRef,
this.mainXRefEntriesOffset);
this.catalog = new Catalog(this.xref);
if(this.xref.trailer && this.xref.trailer.has('ID')) {
if (this.xref.trailer && this.xref.trailer.has('ID')) {
var fileID = '';
this.xref.trailer.get('ID')[0].split('').forEach(function(el) {
fileID += Number(el.charCodeAt(0)).toString(16);
@ -543,14 +542,15 @@ var PDFDocModel = (function PDFDocModelClosure() {
return shadow(this, 'numPages', num);
},
getFingerprint: function pdfDocGetFingerprint() {
if(this.fileID) {
if (this.fileID) {
return this.fileID;
} else {
// If we got no fileID, then we generate one, from the first 100 bytes of PDF
// If we got no fileID, then we generate one,
// from the first 100 bytes of PDF
var data = this.stream.bytes.subarray(0, 100);
var hash = calculateMD5(data, 0, data.length);
var strHash = '';
for(var i = 0, length = hash.length; i < length; i++) {
for (var i = 0, length = hash.length; i < length; i++) {
strHash += Number(hash[i]).toString(16);
}

105
web/viewer.js
View File

@ -28,12 +28,7 @@ var Cache = function cacheCache(size) {
// Settings Manager - This is a utility for saving settings
// First we see if localStorage is available, FF bug #495747
// If not, we use FUEL in FF and fallback to Cookies for other browsers.
var Settings = (function settingsClosure() {
var isCookiesEnabled = (function cookiesEnabledTest() {
document.cookie = 'they=work';
return document.cookie.length > 0;
})();
var Settings = (function SettingsClosure() {
var isLocalStorageEnabled = (function localStorageEnabledTest() {
try {
localStorage;
@ -42,36 +37,60 @@ var Settings = (function settingsClosure() {
}
return true;
})();
var extPrefix = 'extensions.uriloader@pdf.js';
var isExtension = location.protocol == 'chrome:' && !isLocalStorageEnabled;
return {
set: function settingsSet(name, val) {
if (location.protocol == 'chrome:' && !isLocalStorageEnabled) {
Application.prefs.setValue(extPrefix + '.' + name, val);
} else if (isLocalStorageEnabled) {
localStorage.setItem(name, val);
} else if (isCookiesEnabled) {
var cookieString = name + '=' + escape(val);
var expire = new Date();
expire.setTime(expire.getTime() + 1000 * 60 * 60 * 24 * 365);
cookieString += '; expires=' + expire.toGMTString();
document.cookie = cookieString;
function Settings(fingerprint) {
var database = null;
var index;
if (isExtension)
database = Application.prefs.getValue(extPrefix + '.database', '{}');
else if (isLocalStorageEnabled)
database = localStorage.getItem('database') || '{}';
else
return false;
database = JSON.parse(database);
if (!('files' in database))
database.files = [];
if (database.files.length >= 20)
database.files.shift();
for (var i = 0, length = database.files.length; i < length; i++) {
var branch = database.files[i];
if (branch.fingerprint == fingerprint) {
index = i;
break;
}
}
if (typeof index != 'number')
index = database.files.push({fingerprint: fingerprint}) - 1;
this.file = database.files[index];
this.database = database;
if (isExtension)
Application.prefs.setValue(extPrefix + '.database',
JSON.stringify(database));
else if (isLocalStorageEnabled)
localStorage.setItem('database', JSON.stringify(database));
}
Settings.prototype = {
set: function settingsSet(name, val) {
var file = this.file;
file[name] = val;
if (isExtension) {
Application.prefs.setValue(extPrefix + '.database',
JSON.stringify(this.database));
}
else if (isLocalStorageEnabled)
localStorage.setItem('database', JSON.stringify(this.database));
},
get: function settingsGet(name, defaultValue) {
if (location.protocol == 'chrome:' && !isLocalStorageEnabled) {
var preferenceName = extPrefix + '.' + name;
return Application.prefs.getValue(preferenceName, defaultValue);
} else if (isLocalStorageEnabled) {
return localStorage.getItem(name) || defaultValue;
} else if (isCookiesEnabled) {
var res = document.cookie.match('(^|;) ?' + name + '=([^;]*)(;|$)');
return res ? unescape(res[2]) : defaultValue;
}
return this.file[name] || defaultValue;
}
};
return Settings;
})();
var cache = new Cache(kCacheSize);
@ -326,15 +345,14 @@ var PDFView = {
document.getElementById('numPages').innerHTML = pagesCount;
document.getElementById('pageNumber').max = pagesCount;
PDFView.documentFingerprint = id;
var store = PDFView.store = new Settings(id);
if (store.get('exists', false)) {
var page = store.get('page', '1');
var zoom = store.get('zoom', PDFView.currentScale);
var left = store.get('scrollLeft', '0');
var top = store.get('scrollTop', '0');
if (Settings.get(id + '.exists', false)) {
var page = Settings.get(id + '.page', '1');
var zoom = Settings.get(id + '.zoom', PDFView.currentScale);
var left = Settings.get(id + '.scrollLeft', '0');
var top = Settings.get(id + '.scrollTop', '0');
storedHash = 'page=' + page + '&zoom=' + Math.round(zoom * 100);
storedHash += ',' + left + ',' + top;
storedHash = 'page=' + page + '&zoom=' + zoom + ',' + left + ',' + top;
}
var pages = this.pages = [];
@ -371,7 +389,8 @@ var PDFView = {
}
else if (storedHash) {
this.setHash(storedHash);
}
} else
window.scrollTo(0, 0); // Scroll to top is default.
},
setHash: function pdfViewSetHash(hash) {
@ -890,12 +909,12 @@ function updateViewarea() {
window.pageYOffset - firstPage.y - kViewerTopMargin);
pdfOpenParams += ',' + Math.round(topLeft.x) + ',' + Math.round(topLeft.y);
var id = PDFView.documentFingerprint;
Settings.set(id + '.exists', true);
Settings.set(id + '.page', pageNumber);
Settings.set(id + '.zoom', PDFView.currentScale);
Settings.set(id + '.scrollLeft', Math.round(topLeft.x));
Settings.set(id + '.scrollTop', Math.round(topLeft.y));
var store = PDFView.store;
store.set('exists', true);
store.set('page', pageNumber);
store.set('zoom', Math.round(PDFView.currentScale * 100));
store.set('scrollLeft', Math.round(topLeft.x));
store.set('scrollTop', Math.round(topLeft.y));
document.getElementById('viewBookmark').href = pdfOpenParams;
}