How to read atrace data in compressed format

Question

I am using

atrace -z

to get compressed trace file. Is there any way to decompress this file to recover original data

Probably `gunzip` but `file atrace.out` will tell you about a great many file formats. — Brian White, Mar 20 '15 at 06:09
IIRC it's using zlib in the Python script. Take a look at the atrace script to see what it does. — fadden, Mar 20 '15 at 15:26

score 1 · Answer 1 · edited Apr 13 '17 at 12:36

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Yes it's possible. There is just one "weird trick" to be done -- atrace prepends all of its output with done\nTRACE:\n string (see the source), so these bytes need to be removed first, and then the rest is just an output from zlib's deflate. See this answer on how to decompress it.

For example (on Linux):

dd if=<compressed-trace-file> bs=1 skip=13 | zlib-flate -uncompress

edited Apr 13 '17 at 12:36

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answered Mar 31 '17 at 23:05

Mikhail Naganov

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How to read atrace data in compressed format

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