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Bug #40950 bzread() reads only 8192 bytes but uses memory for full $length
Submitted: 2007-03-29 16:21 UTC Modified: 2007-04-02 21:14 UTC
From: phpbugs at sebastianmendel dot de Assigned:
Status: Not a bug Package: Bzip2 Related
PHP Version: 5.2.1 OS: Windows
Private report: No CVE-ID: None
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 [2007-03-29 16:21 UTC] phpbugs at sebastianmendel dot de
bzread() does only read 8192 bytes from file handle but consumes memory in the size of $length

Reproduce code:
echo memory_get_peak_usage(true);
$read_data = bzread(bzopen('file.bz2'), 10000000)
echo strlen($read_data);
echo memory_get_peak_usage(true);


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 [2007-04-02 21:14 UTC]
Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at and the instructions on how to report
a bug at

This is because the memory is pre-allocated before the bz2 file is read.
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