Avoid crashing on CPDF_ToUnicodeMap::Load by using ValueOrDefault()

Avoid crashing on CPDF_ToUnicodeMap::Load by using ValueOrDefault()

- Added private method to avoid duplicated code.
- If the unicode calculation overflows, 0 is used instead of crashing.

Committed: https://pdfium.googlesource.com/pdfium/+/1c4b767e822a7537f2c6c19b42dddce840e033ee

[npm, 2016-10-04 19:46:05]

The CQ bit was checked by npm@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-10-04 19:46:13]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[npm, 2016-10-04 19:46:30]

Description was changed from

==========
Avoid crashing on CPDF_ToUnicodeMap::Load by using ValueOrDefault()

- Added private method to avoid duplicated code.
- If the unicode calculation overflows, 0 is used instead of crashing.
==========

to

==========
Avoid crashing on CPDF_ToUnicodeMap::Load by using ValueOrDefault()

- Added private method to avoid duplicated code.
- If the unicode calculation overflows, 0 is used instead of crashing.
==========

[npm, 2016-10-04 19:46:30]

npm@chromium.org changed reviewers:
+ dsinclair@chromium.org, tsepez@chromium.org

[npm, 2016-10-04 19:51:35]

PTAL

[commit-bot: I haz the power, 2016-10-04 19:58:23]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-10-04 19:58:24]

Dry run: This issue passed the CQ dry run.

[Tom Sepez, 2016-10-04 19:59:18]

lgtm

[npm, 2016-10-04 20:00:12]

The CQ bit was checked by npm@chromium.org

[commit-bot: I haz the power, 2016-10-04 20:00:24]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-04 20:00:42]

Description was changed from

==========
Avoid crashing on CPDF_ToUnicodeMap::Load by using ValueOrDefault()

- Added private method to avoid duplicated code.
- If the unicode calculation overflows, 0 is used instead of crashing.
==========

to

==========
Avoid crashing on CPDF_ToUnicodeMap::Load by using ValueOrDefault()

- Added private method to avoid duplicated code.
- If the unicode calculation overflows, 0 is used instead of crashing.

Committed:
https://pdfium.googlesource.com/pdfium/+/1c4b767e822a7537f2c6c19b42dddce840e0...
==========

[commit-bot: I haz the power, 2016-10-04 20:00:43]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/1c4b767e822a7537f2c6c19b42dddce840e0...