Windows, test wrapper: implement IFStream

Implement a buffered input stream with look-ahead
support.

This class is necessary to support CDATA-encoding
large test logs that would be inconvenient to read
into memory.

Unfortunately STL doesn't seem to offer a buffered
file stream object that takes a HANDLE or FILE*.
The std::ifstream, which seems to implement a
buffered input stream, can only be constructed
using an octet-stream path, which makes it
impossible to open paths by WCHAR strings on
Windows, while long paths must be opened using
WCHAR strings.

See https://github.com/bazelbuild/bazel/issues/5508

Closes #7214.

PiperOrigin-RevId: 232630569
3 files changed
tree: b3e6630c1de1b58b4679f16c064cd7c8487d062f
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
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