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Do not switch to a range request for small PDFs

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This commit is contained in:
Rob Wu 2014-02-06 23:05:19 +01:00
parent 0c268f2345
commit 2a19dc86e7
2 changed files with 12 additions and 6 deletions
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8
src/core/pdf_manager.js
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@ -19,6 +19,9 @@
'use strict';
// The maximum number of bytes fetched per range request
var RANGE_CHUNK_SIZE = 65536;
// TODO(mack): Make use of PDFJS.Util.inherit() when it becomes available
var BasePdfManager = (function BasePdfManagerClosure() {
function BasePdfManager() {
@ -132,9 +135,6 @@ var LocalPdfManager = (function LocalPdfManagerClosure() {
})();
var NetworkPdfManager = (function NetworkPdfManagerClosure() {
var CHUNK_SIZE = 65536;
function NetworkPdfManager(args, msgHandler) {
this.msgHandler = msgHandler;
@ -147,7 +147,7 @@ var NetworkPdfManager = (function NetworkPdfManagerClosure() {
disableAutoFetch: args.disableAutoFetch,
initialData: args.initialData
};
this.streamManager = new ChunkedStreamManager(args.length, CHUNK_SIZE,
this.streamManager = new ChunkedStreamManager(args.length, RANGE_CHUNK_SIZE,
args.url, params);
this.pdfModel = new PDFDocument(this, this.streamManager.getStream(),

10
src/core/worker.js
View File

@ -18,7 +18,7 @@
MissingPDFException, PasswordException, PDFJS, Promise,
UnknownErrorException, NetworkManager, LocalPdfManager,
NetworkPdfManager, XRefParseException, LegacyPromise,
isInt, PasswordResponses, MessageHandler, Ref */
isInt, PasswordResponses, MessageHandler, Ref, RANGE_CHUNK_SIZE */
'use strict';
@ -119,6 +119,13 @@ var WorkerMessageHandler = PDFJS.WorkerMessageHandler = {
if (!isInt(length)) {
return;
}
source.length = length;
if (length <= 2 * RANGE_CHUNK_SIZE) {
// The file size is smaller than the size of two chunks, so it does
// not make any sense to abort the request and retry with a range
// request.
return;
}
// NOTE: by cancelling the full request, and then issuing range
// requests, there will be an issue for sites where you can only
@ -126,7 +133,6 @@ var WorkerMessageHandler = PDFJS.WorkerMessageHandler = {
// server should not be returning that it can support range requests.
networkManager.abortRequest(fullRequestXhrId);
source.length = length;
try {
pdfManager = new NetworkPdfManager(source, handler);
pdfManagerPromise.resolve(pdfManager);