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Jonas Jenwald 32bfa55d98 Attempt to estimate the minimum required buffer length when initializing StreamsSequenceStream instances 
For most other `DecodeStream` based streams, we'll attempt to estimate the minimum `buffer` length based on the raw stream data. The purpose of this is to avoid having to unnecessarily re-size the `buffer`, thus reducing the number of *intermediate* allocations necessary when decoding the stream data.
However, currently no such optimization is attempted for `StreamsSequenceStream`, and given that they can often be quite large that seems unfortunate. To improve this, at least somewhat, this patch utilizes the raw sizes of the `StreamsSequenceStream` sub-streams to estimate the minimum required `buffer` length.

Most likely this patch won't have a huge effect on memory consumption, however for pathological cases it should help reduce peak memory usage slightly.
One example is the PDF file in issue 2813, where currently the `StreamsSequenceStream` instances would grow their `buffer`s as `2 MiB -> 4 MiB -> 8 MiB -> 16 MiB -> 32 MiB`. With this patch, the same stream `buffers`s grow as `8 MiB -> 16 MiB -> 32 MiB`, thus avoiding a total of `12 MiB` of *intermediate* allocations (since there's two `StreamsSequenceStream` used, for rendering/text-extraction).
2018-07-26 13:42:59 +02:00
.github Attempt to clarify the meaning of "extension" in the ISSUE_TEMPLATE 2017-10-21 11:32:03 +02:00
docs Modified Examples to work without systemjs 2018-07-21 16:56:06 +05:30
examples Modified Examples to work without systemjs 2018-07-21 16:56:06 +05:30
extensions Provide custom messages for the no-restricted-globals ESLint rule, and refactor the .eslintrc files (PR 9868 follow-up) 2018-07-23 14:10:13 +02:00
external Provide custom messages for the no-restricted-globals ESLint rule, and refactor the .eslintrc files (PR 9868 follow-up) 2018-07-23 14:10:13 +02:00
l10n Remove the jp-JP-mac locale 2018-07-08 15:40:38 +02:00
src Attempt to estimate the minimum required buffer length when initializing StreamsSequenceStream instances 2018-07-26 13:42:59 +02:00
test Provide custom messages for the no-restricted-globals ESLint rule, and refactor the .eslintrc files (PR 9868 follow-up) 2018-07-23 14:10:13 +02:00
web Add a BasePreferences.getAll method and use it to fetch all Preferences at once in PDFViewerApplication._readPreferences 2018-07-25 10:43:36 +02:00
.editorconfig Uses editorconfig to maintain consistent coding styles 2015-11-14 07:32:18 +05:30
.eslintignore Adds streams-lib polyfill and exports ReadableStream from shared/util. 2017-05-20 00:26:34 +05:30
.eslintrc Provide custom messages for the no-restricted-globals ESLint rule, and refactor the .eslintrc files (PR 9868 follow-up) 2018-07-23 14:10:13 +02:00
.gitattributes Fixing C++,PHP and Pascal presence in the repo 2015-10-29 13:03:51 -05:00
.gitignore Include package-lock.json for reproducible builds 2018-06-02 20:29:47 +02:00
.gitmodules Update fonttools location and version (issue 6223) 2015-07-17 12:51:09 +02:00
.mailmap Add mgol's name to AUTHORS, add .mailmap 2017-11-22 10:46:11 +01:00
.travis.yml Travis CI: use most recent version of NPM 2016-10-27 21:10:19 +02:00
AUTHORS Add SehyunPark to AUTHORS 2017-11-29 22:24:08 +09:00
EXPORT Adds ECCN response statement 2017-10-23 13:31:36 -05:00
gulpfile.js Stop exposing the URL polyfill in the global scope 2018-07-04 09:16:28 +02:00
LICENSE cleaned whitespace 2015-02-17 11:07:37 -05:00
package-lock.json Replace the remaining occurences of instanceof Array with Array.isArray() 2018-07-09 13:17:41 +02:00
package.json Replace the remaining occurences of instanceof Array with Array.isArray() 2018-07-09 13:17:41 +02:00
pdfjs.config Version 2.0 2017-10-30 08:18:25 -05:00
README.md Modified Examples to work without systemjs 2018-07-21 16:56:06 +05:30
systemjs.config.js Provide custom messages for the no-restricted-globals ESLint rule, and refactor the .eslintrc files (PR 9868 follow-up) 2018-07-23 14:10:13 +02:00

README.md

PDF.js

PDF.js is a Portable Document Format (PDF) viewer that is built with HTML5.

PDF.js is community-driven and supported by Mozilla Labs. Our goal is to create a general-purpose, web standards-based platform for parsing and rendering PDFs.

Contributing

PDF.js is an open source project and always looking for more contributors. To get involved, visit:

Feel free to stop by #pdfjs on irc.mozilla.org for questions or guidance.

Getting Started

Online demo

Browser Extensions

Firefox

PDF.js is built into version 19+ of Firefox.

Chrome

  • The official extension for Chrome can be installed from the Chrome Web Store. This extension is maintained by @Rob--W.
  • Build Your Own - Get the code as explained below and issue gulp chromium. Then open Chrome, go to Tools > Extension and load the (unpackaged) extension from the directory build/chromium.

Getting the Code

To get a local copy of the current code, clone it using git:

$ git clone git://github.com/mozilla/pdf.js.git
$ cd pdf.js

Next, install Node.js via the official package or via nvm. You need to install the gulp package globally (see also gulp's getting started):

$ npm install -g gulp-cli

If everything worked out, install all dependencies for PDF.js:

$ npm install

Finally, you need to start a local web server as some browsers do not allow opening PDF files using a file:// URL. Run:

$ gulp server

and then you can open:

Please keep in mind that this requires an ES6 compatible browser; refer to Building PDF.js for usage with older browsers.

It is also possible to view all test PDF files on the right side by opening:

Building PDF.js

In order to bundle all src/ files into two production scripts and build the generic viewer, run:

$ gulp generic

This will generate pdf.js and pdf.worker.js in the build/generic/build/ directory. Both scripts are needed but only pdf.js needs to be included since pdf.worker.js will be loaded by pdf.js. The PDF.js files are large and should be minified for production.

Using PDF.js in a web application

To use PDF.js in a web application you can choose to use a pre-built version of the library or to build it from source. We supply pre-built versions for usage with NPM and Bower under the pdfjs-dist name. For more information and examples please refer to the wiki page on this subject.

Including via a CDN

PDF.js is hosted on several free CDNs:

Learning

You can play with the PDF.js API directly from your browser using the live demos below:

More examples can be found in the examples folder. Some of them are using the pdfjs-dist package, which can be built and installed in this repo directory via gulp dist-install command.

For an introduction to the PDF.js code, check out the presentation by our contributor Julian Viereck:

More learning resources can be found at:

Questions

Check out our FAQs and get answers to common questions:

Talk to us on IRC (Internet Relay Chat):

  • #pdfjs on irc.mozilla.org

File an issue:

Follow us on twitter: @pdfjs