Initial check in of big integer library

Initial check in of big integer library, v2010.04.30

R=tsepez@chromium.org

Committed: https://pdfium.googlesource.com/pdfium/+/7504b3d87d6143661746d85c3c3e4052939b4e52

[Bo Xu, 2014-12-01 18:29:00]

bo_xu@foxitsoftware.com changed reviewers:
+ jun_fang@foxitsoftware.com, tsepez@chromium.org

[Bo Xu, 2014-12-02 18:30:36]

On 2014/12/01 18:29:01, Bo Xu wrote:

Hi Tom, this patch check in all files in the big integer library untouched, with
the README file changed to LICENSE.

[Tom Sepez, 2014-12-02 20:39:00]

> Hi Tom, this patch check in all files in the big integer library untouched,
with
> the README file changed to LICENSE.

LGTM.  I've gotten the approvals to land this patch.  Thanks.

[Bo Xu, 2014-12-02 21:07:13]

Committed patchset #1 (id:1) manually as
7504b3d87d6143661746d85c3c3e4052939b4e52 (presubmit successful).

[Nico, 2015-12-08 17:05:50]

thakis@chromium.org changed reviewers:
+ thakis@chromium.org

[Nico, 2015-12-08 17:05:50]

is this used for anything?

[Tom Sepez, 2015-12-08 17:11:43]

On 2015/12/08 17:05:50, Nico wrote:
> is this used for anything?

Yes, in the XFA branch of pdfium, it is used to compute checksums for barcodes.