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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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57
src/core/worker.js
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@ -16,7 +16,7 @@
*/
/* globals PDFJS, createPromiseCapability, LocalPdfManager, NetworkPdfManager,
NetworkManager, isInt, RANGE_CHUNK_SIZE, MissingPDFException,
UnexpectedResponseException, PasswordException, Promise,
UnexpectedResponseException, PasswordException, Promise, warn,
PasswordResponses, InvalidPDFException, UnknownErrorException,
XRefParseException, Ref, info, globalScope, error, MessageHandler */
@ -86,6 +86,7 @@ var WorkerMessageHandler = PDFJS.WorkerMessageHandler = {
httpHeaders: source.httpHeaders,
withCredentials: source.withCredentials
});
var cachedChunks = [];
var fullRequestXhrId = networkManager.requestFull({
onHeadersReceived: function onHeadersReceived() {
if (disableRange) {
@ -116,11 +117,18 @@ var WorkerMessageHandler = PDFJS.WorkerMessageHandler = {
return;
}
// NOTE: by cancelling the full request, and then issuing range
// requests, there will be an issue for sites where you can only
// request the pdf once. However, if this is the case, then the
// server should not be returning that it can support range requests.
networkManager.abortRequest(fullRequestXhrId);
if (networkManager.isStreamingRequest(fullRequestXhrId)) {
// We can continue fetching when progressive loading is enabled,
// and we don't need the autoFetch feature.
source.disableAutoFetch = true;
} else {
// NOTE: by cancelling the full request, and then issuing range
// requests, there will be an issue for sites where you can only
// request the pdf once. However, if this is the case, then the
// server should not be returning that it can support range
// requests.
networkManager.abortRequest(fullRequestXhrId);
}
try {
pdfManager = new NetworkPdfManager(source, handler);
@ -130,10 +138,44 @@ var WorkerMessageHandler = PDFJS.WorkerMessageHandler = {
}
},
onProgressiveData: PDFJS.disableStream ? null :
function onProgressiveData(chunk) {
if (!pdfManager) {
cachedChunks.push(chunk);
return;
}
pdfManager.sendProgressiveData(chunk);
},
onDone: function onDone(args) {
if (pdfManager) {
return; // already processed
}
var pdfFile;
if (args === null) {
// TODO add some streaming manager, e.g. for unknown length files.
// The data was returned in the onProgressiveData, combining...
var pdfFileLength = 0, pos = 0;
cachedChunks.forEach(function (chunk) {
pdfFileLength += chunk.byteLength;
});
if (source.length && pdfFileLength !== source.length) {
warn('reported HTTP length is different from actual');
}
var pdfFileArray = new Uint8Array(pdfFileLength);
cachedChunks.forEach(function (chunk) {
pdfFileArray.set(new Uint8Array(chunk), pos);
pos += chunk.byteLength;
});
pdfFile = pdfFileArray.buffer;
} else {
pdfFile = args.chunk;
}
// the data is array, instantiating directly from it
try {
pdfManager = new LocalPdfManager(args.chunk, source.password);
pdfManager = new LocalPdfManager(pdfFile, source.password);
pdfManagerCapability.resolve();
} catch (ex) {
pdfManagerCapability.reject(ex);
@ -228,6 +270,7 @@ var WorkerMessageHandler = PDFJS.WorkerMessageHandler = {
PDFJS.cMapPacked = data.cMapPacked === true;
getPdfManager(data).then(function () {
handler.send('PDFManagerReady', null);
pdfManager.onLoadedStream().then(function(stream) {
handler.send('DataLoaded', { length: stream.bytes.byteLength });
});