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Implement streaming using moz-chunk-arraybuffer

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This commit is contained in:
Yury Delendik 2014-09-05 20:02:54 -05:00
parent 477efd52bc
commit c3f191a27c
10 changed files with 274 additions and 77 deletions
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59
extensions/firefox/content/PdfStreamConverter.jsm
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@ -178,6 +178,7 @@ function makeContentReadable(obj, window) {
function PdfDataListener(length) {
this.length = length; // less than 0, if length is unknown
this.data = new Uint8Array(length >= 0 ? length : 0x10000);
this.position = 0;
this.loaded = 0;
}
@ -200,6 +201,11 @@ PdfDataListener.prototype = {
this.loaded = willBeLoaded;
this.onprogress(this.loaded, this.length >= 0 ? this.length : void(0));
},
readData: function PdfDataListener_readData() {
var data = this.data.subarray(this.position, this.loaded);
this.position = this.loaded;
return data;
},
getData: function PdfDataListener_getData() {
var data = this.data;
if (this.loaded != data.length)
@ -523,11 +529,13 @@ var RangedChromeActions = (function RangedChromeActionsClosure() {
*/
function RangedChromeActions(
domWindow, contentDispositionFilename, originalRequest,
dataListener) {
rangeEnabled, streamingEnabled, dataListener) {
ChromeActions.call(this, domWindow, contentDispositionFilename);
this.dataListener = dataListener;
this.originalRequest = originalRequest;
this.rangeEnabled = rangeEnabled;
this.streamingEnabled = streamingEnabled;
this.pdfUrl = originalRequest.URI.spec;
this.contentLength = originalRequest.contentLength;
@ -585,20 +593,46 @@ var RangedChromeActions = (function RangedChromeActionsClosure() {
proto.constructor = RangedChromeActions;
proto.initPassiveLoading = function RangedChromeActions_initPassiveLoading() {
this.originalRequest.cancel(Cr.NS_BINDING_ABORTED);
this.originalRequest = null;
var self = this;
var data;
if (!this.streamingEnabled) {
this.originalRequest.cancel(Cr.NS_BINDING_ABORTED);
this.originalRequest = null;
data = this.dataListener.getData();
this.dataListener = null;
} else {
data = this.dataListener.readData();
this.dataListener.onprogress = function (loaded, total) {
self.domWindow.postMessage({
pdfjsLoadAction: 'progressiveRead',
loaded: loaded,
total: total,
chunk: self.dataListener.readData()
}, '*');
};
this.dataListener.oncomplete = function () {
delete self.dataListener;
};
}
this.domWindow.postMessage({
pdfjsLoadAction: 'supportsRangedLoading',
rangeEnabled: this.rangeEnabled,
streamingEnabled: this.streamingEnabled,
pdfUrl: this.pdfUrl,
length: this.contentLength,
data: this.dataListener.getData()
data: data
}, '*');
this.dataListener = null;
return true;
};
proto.requestDataRange = function RangedChromeActions_requestDataRange(args) {
if (!this.rangeEnabled) {
return;
}
var begin = args.begin;
var end = args.end;
var domWindow = this.domWindow;
@ -840,7 +874,8 @@ PdfStreamConverter.prototype = {
} catch (e) {}
var rangeRequest = false;
if (isHttpRequest) {
var hash = aRequest.URI.ref;
if (isHttpRequest && !getBoolPref(PREF_PREFIX + '.disableRange', false)) {
var contentEncoding = 'identity';
try {
contentEncoding = aRequest.getResponseHeader('Content-Encoding');
@ -851,12 +886,13 @@ PdfStreamConverter.prototype = {
acceptRanges = aRequest.getResponseHeader('Accept-Ranges');
} catch (e) {}
var hash = aRequest.URI.ref;
rangeRequest = contentEncoding === 'identity' &&
acceptRanges === 'bytes' &&
aRequest.contentLength >= 0 &&
hash.indexOf('disableRange=true') < 0;
hash.toLowerCase().indexOf('disablerange=true') < 0;
}
var streamRequest = !getBoolPref(PREF_PREFIX + '.disableStream', false) &&
hash.toLowerCase().indexOf('disablestream=true') < 0;
aRequest.QueryInterface(Ci.nsIChannel);
@ -914,12 +950,13 @@ PdfStreamConverter.prototype = {
// may have changed during a redirect.
var domWindow = getDOMWindow(channel);
var actions;
if (rangeRequest) {
if (rangeRequest || streamRequest) {
actions = new RangedChromeActions(
domWindow, contentDispositionFilename, aRequest, dataListener);
domWindow, contentDispositionFilename, aRequest,
rangeRequest, streamRequest, dataListener);
} else {
actions = new StandardChromeActions(
domWindow, contentDispositionFilename, dataListener);
domWindow, contentDispositionFilename, dataListener);
}
var requestListener = new RequestListener(actions);
domWindow.addEventListener(PDFJS_EVENT_ID, function(event) {