Message373519
Here is a BCJ only CFFI test project.
https://github.com/miurahr/bcj-cffi
It imports two bcj_x86 C sources, one is from liblzma (src/xz_bcj_x86.c) taht is bind with python's lzma module, and the other is from xz-embbed project for linux kernel.(src/xz_simple_bcj.c)
We can observe that
1. it has an interface which overwrite buffer
2. it returns good resulted buffer (digest assertion) in both case
3. it returns 4 bytes less size than expected.
for 3, it is because return value of BCJ is defined such as
```
size -= 4;
for (i = 0; i < size; ++i) {...}
return i;
```
and variable i sometimes increment 4 bytes when target sequence is found and processed.
It may be natural that a size value returned from BCJ filter is often 4 bytes smaller than actual. |
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Date |
User |
Action |
Args |
2020-07-11 07:19:49 | miurahr | set | recipients:
+ miurahr, malin |
2020-07-11 07:19:49 | miurahr | set | messageid: <1594451989.18.0.674730192117.issue41210@roundup.psfhosted.org> |
2020-07-11 07:19:49 | miurahr | link | issue41210 messages |
2020-07-11 07:19:49 | miurahr | create | |
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