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url: alloc the download buffer at transfer start

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... and free it as soon as the transfer is done. It removes the extra
alloc when a new size is set with setopt() and reduces memory for unused
easy handles.

In addition: the closure_handle now doesn't use an allocated buffer at
all but the smallest supported size as a stack based one.

Closes #5472
This commit is contained in:
Daniel Stenberg 2020-05-28 18:30:47 +02:00
parent 842f73de58
commit c4e6968127
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10 changed files with 66 additions and 105 deletions
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5
tests/data/test509
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@ -34,10 +34,7 @@ nothing
# Verify data after the test has been "shot"
<verify>
<stdout>
seen custom_calloc()
seen custom_malloc()
seen custom_realloc()
seen custom_free()
Callbacks were invoked!
</stdout>
</verify>