decompression features automatic support of sparse files,
aka a form of "compression" where entire blocks consists only of zeroes.
This only works for some compatible file systems (like ext4),
others simply ignore it (like afs).
Triggering this feature relies of `fseek()`.
But `fseek()` is not compatible with non-seekable devices, such as pipes.
Therefore it's disabled for pipes.
However, there are other objects which are not compatible with `fseek()`, such as block devices.
Changed the logic, so that `fseek()` (and therefore sparse write) is only automatically enabled on regular files.
Note that this automatic behavior can always be overridden by explicit commands `--sparse` and `--no-sparse`.
fix#3583
Bytef and uInt are zlib types, not available when zlib is disabled
Fixes: 1598e6c634ac ("Async write for decompression")
Fixes: cc0657f27d81 ("AsyncIO compression part 2 - added async read and asyncio to compression code (#3022)")
* Fixes zstd-dll build (https://github.com/facebook/zstd/issues/3492):
- Adds pool.o and threading.o dependency to the zstd-dll target
- Moves custom allocation functions into header to avoid needing to add dependency on common.o
- Adds test target for zstd-dll
- Adds github workflow that buildis zstd-dll
such scenario can happen, for example,
when trying a decompression-only benchmark on invalid data.
Other possibilities include an allocation error in an intermediate step.
So far, the benchmark would return immediately, but still return 0.
On command line, this would be confusing, as the program appears successful (though it does not display any successful message).
Now it returns !0, which can be interpreted as an error by command line.
Note that the `fd` is only valid while the file is still open. So we need to
move the setting calls to before we close the file. However! We cannot do so
with the `utime()` call (even though `futimens()` exists) because the follow-
ing `close()` call to the `fd` will reset the atime of the file. So it seems
the `utime()` call has to happen after the file is closed.
Somewhat surprisingly, calling `fchmod()` is non-trivially faster than calling
`chmod()`, and so on.
This commit introduces alternate variants to some common file util functions
that take an optional fd. If present, they call the `f`-variant of the
underlying function. Otherwise, they fall back to the regular filename-taking
version of the function.
[Bugfix] CLI row hash flags set the wrong values
`--[no-]row-match-finder` do the opposite of what they are supposed to.
In effect the no option would activate row hash while the other option will disable it.
This commit fixes the issue and changes the code to use the more readable enum values.
`zstd` CLI has progressively moved to the policy of
ignoring `--rm` command when the output is `stdout`.
The primary drive is to feature a behavior more consistent with `gzip`,
when `--rm` is the default, but is also ignored when output is `stdout`.
Other policies are certainly possible, but would break from this `gzip` convention.
The new policy was inconsistenly enforced, depending on the exact list of commands.
For example, it was possible to circumvent it by using `-c --rm` in this order,
which would re-establish source removal.
- Update the CLI so that it necessarily catch these situations and ensure that `--rm` is always disabled when output is `stdout`.
- Added a warning message in this case (for verbosity 3 `-v`).
- Added an `assert()`, which controls that `--rm` is no longer active with `stdout`
- Added tests, which control the behavior, even when `--rm` is added after `-c`
- Removed some legacy code which where trying to apply a specific policy for the `stdout` + `--rm` case, which is no longer possible
In GCC, we can add a couple more flags to give us confidence that the profile
data is actually being found and used.
Also, my system for example doesn't have a binary installed under the name
`llvm-profdata`, but it does have, e.g., `llvm-profdata-13`, etc. So this
commit adds a variable that can be overridden.
