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Intel IPP-patched bzip2 problems

Valentyn
Novice
851 Views

bzip2 file consists of blocks, which allows decompression from arbitrary block.
We are successfully using this feature in our software with original bzip2 v.1.0.8 library.
But we are getting errors with IPP-patched version.
In the attachment you will find CMake project with 3 apps and test archives which demonstrate these problems.
It will build the apps twice: with IPP and without IPP.
*.info files show the start offset and size of bzip2 blocks.

problem1_ipp: For sizes > 2GB, BZ2_bzCompress with IPP fails - it returns BZ_DATA_ERROR.
problem1_noipp: succeeds.

problem2_ipp: If we try to decompress several consecutive BZip2 blocks (but not entire file) the calls to BZ2 functions succeed but return less data than should.
problem2_noipp: succeeds.

problem3_ipp: Demonstrates the same problem as in problem2 but combines decompressed parts so that it becomes more obvious that some bytes are missing.
problem3_noipp: Combined decompressed file (ut_test_data_created_with_ipp.csv.bz2_combined_split_on_offset_39541_without_ipp) is identical to the original uncompressed file (ut_test_data.csv).

Steps to reproduce:

# Modify the following paths in `bzip2_ipp_example/CMakeLists.txt`:
IPPROOT
BZIP2_ROOT_WITH_IPP
BZIP2_ROOT_WITHOUT_IPP

cd bzip2_ipp_example

# Clean
rm -rf build

# Configure
cmake -B build .

# Build
cmake --build build -j

# Run
build/problem1_noipp/problem1_noipp
build/problem1_ipp/problem1_ipp

build/problem2_noipp/problem2_noipp
build/problem2_ipp/problem2_ipp

build/problem3_noipp/problem3_noipp
build/problem3_ipp/problem3_ipp

 

 

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7 Replies
Gennady_F_Intel
Moderator
814 Views

which version of IPP did you try? 

Valentyn
Novice
794 Views

2020.3.304

I also downloaded 2021.1.1.47 but bzip2 patch in it is the same as in 2020.3.304.

Gennady_F_Intel
Moderator
783 Views

We have managed to reproduce the issue and will keep the thread updated with the status.


Valentyn
Novice
727 Views

Hi,

Have you been able to find the root cause of these problems?

Is there a date/version when the fix is planned?

Thank you for response.

VidyalathaB_Intel
Moderator
531 Views

Hi,


Thank you for your patience.

The issue raised by you has been fixed in the 2021.4 version. Please download and let us know if this resolves your issue.


Regards,

Vidya.


Valentyn
Novice
444 Views

IPP 2021.4 resolves reported issues. Thanks!

VidyalathaB_Intel
Moderator
391 Views

Hi,


Thanks for the confirmation.


As the issue is resolved we are closing this thread from our end.

If you need any additional information from Intel, please post a new question as this thread will no longer be monitored.


Have a Good Day!


Regards,

Vidya.


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