move a boolean field to be represented implicitly with the enum tag.
Just borrowing one of the many strategies of stage2.
This simple change took the peak mem usage from std lib tests on
my machine from 8.21 GiB to 8.11 GiB.
* translate-c: Use [N:0] arrays when initializer is a string literal
Translate incomplete arrays as [N:0] when initialized by a string literal.
This preserves a bit more of the type information from the original C program.
Fixes#8215
See https://eprint.iacr.org/2019/1492.pdf for justification.
8 rounds ChaCha20 provides a 2.5x speedup, and is still believed
to be safe.
Round-reduced versions are actually deployed (ex: Android filesystem
encryption), and thanks to the magic of comptime, it doesn't take much
to support them.
This also makes the ChaCha20 code more consistent with the Salsa20 code,
removing internal functions that were not part of the public API any more.
No breaking changes; the public API remains backwards compatible.
Now reading a source file and decoding it from UTF-16LE to UTF-8 is
done in a single function. Error messages are improved, and an error is
emitted when the source file has a BOM not supported (UTF-16BE, UTF-32).
Please note that the BOM of UTF-32 is composed of the same bytes as the
BOM of UTF-16 followed by a null character. Therefore a source file in
UTF-16LE starting with a null byte will be interpreted as an UTF-32, and
rejeted because of an invalid format. In pratice this is not a problem,
as the code would have been rejected later anyway because of the null
character.
Fixes#2820
After reading the source code, the first two bytes are inspected, and
if they correspond to a UTF-16 BOM in little-endian order, the source
code is converted to UTF-8.
