yetangitu/pdf.js
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Makes PDF data reading Streams API friendly.

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This commit is contained in:
Yury Delendik 2016-02-09 14:55:11 -06:00
parent 8cdb69634f
commit 0d591719d9
8 changed files with 1153 additions and 178 deletions
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93
test/unit/api_spec.js
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@ -8,6 +8,7 @@
describe('api', function() {
var basicApiUrl = combineUrl(window.location.href, '../pdfs/basicapi.pdf');
var basicApiFileLength = 105779; // bytes
var TEST_TIMEOUT = 20000;
function waitsForPromiseResolved(promise, successCallback) {
var resolved = false;
promise.then(function(val) {
@ -20,7 +21,7 @@ describe('api', function() {
});
waitsFor(function() {
return resolved;
}, 20000);
}, TEST_TIMEOUT);
}
function waitsForPromiseRejected(promise, failureCallback) {
var rejected = false;
@ -34,7 +35,13 @@ describe('api', function() {
});
waitsFor(function() {
return rejected;
}, 20000);
}, TEST_TIMEOUT);
}
function waitSome(callback) {
var WAIT_TIMEOUT = 10;
setTimeout(function () {
callback();
}, WAIT_TIMEOUT);
}
describe('PDFJS', function() {
@ -710,4 +717,86 @@ describe('api', function() {
waitsForPromiseResolved(promiseDone, function() {});
});
});
describe('PDFDataRangeTransport', function () {
var pdfPath = combineUrl(window.location.href, '../pdfs/tracemonkey.pdf');
var loadPromise;
function getDocumentData() {
if (loadPromise) {
return loadPromise;
}
loadPromise = new Promise(function (resolve, reject) {
var xhr = new XMLHttpRequest(pdfPath);
xhr.open('GET', pdfPath);
xhr.responseType = 'arraybuffer';
xhr.onload = function () { resolve(new Uint8Array(xhr.response)); };
xhr.onerror = function () { reject(new Error('PDF is not loaded')); };
xhr.send();
});
return loadPromise;
}
it('should fetch document info and page using ranges', function () {
var transport;
var initialDataLength = 4000;
var fetches = 0;
var getDocumentPromise = getDocumentData().then(function (data) {
var initialData = data.subarray(0, initialDataLength);
transport = new PDFJS.PDFDataRangeTransport(data.length, initialData);
transport.requestDataRange = function (begin, end) {
fetches++;
waitSome(function () {
transport.onDataProgress(4000);
transport.onDataRange(begin, data.subarray(begin, end));
});
};
var loadingTask = PDFJS.getDocument(transport);
return loadingTask.promise;
});
var pdfDocument;
var getPagePromise = getDocumentPromise.then(function (pdfDocument_) {
pdfDocument = pdfDocument_;
var pagePromise = pdfDocument.getPage(10);
return pagePromise;
});
waitsForPromiseResolved(getPagePromise, function (page) {
expect(pdfDocument.numPages).toEqual(14);
expect(page.rotate).toEqual(0);
expect(fetches).toBeGreaterThan(2);
});
});
it('should fetch document info and page using range and streaming',
function () {
var transport;
var initialDataLength = 4000;
var fetches = 0;
var getDocumentPromise = getDocumentData().then(function (data) {
var initialData = data.subarray(0, initialDataLength);
transport = new PDFJS.PDFDataRangeTransport(data.length, initialData);
transport.requestDataRange = function (begin, end) {
fetches++;
if (fetches === 1) {
// send rest of the data on first range request.
transport.onDataProgressiveRead(data.subarray(initialDataLength));
}
waitSome(function () {
transport.onDataRange(begin, data.subarray(begin, end));
});
};
var loadingTask = PDFJS.getDocument(transport);
return loadingTask.promise;
});
var pdfDocument;
var getPagePromise = getDocumentPromise.then(function (pdfDocument_) {
pdfDocument = pdfDocument_;
var pagePromise = pdfDocument.getPage(10);
return pagePromise;
});
waitsForPromiseResolved(getPagePromise, function (page) {
expect(pdfDocument.numPages).toEqual(14);
expect(page.rotate).toEqual(0);
expect(fetches).toEqual(1);
});
});
});
});