Fixed error in compressing lz4raw with large offsets

[jorgecarleitao]

There was a typo in the implementation compared to the rest of the implementations.

The situation is as follows:

• we have an existing buffer of len L
• the compression required a maximum of B bytes. We thus need to re-resize the buffer to L + B
• The compression uses b <= B bytes

We resized the buffer to B bytes (instead of B + L). Thus, when b > B - L, the compression fails. This is more likely to happen when L>>B.

In V1 pages, L == 0 and thus this is not an issue. However, in V2 pages, L != 0 and we have a problem (compression errors)

[codecov-commenter]

Codecov Report

Merging #140 (2053ae1) into main (47edd88) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #140   +/-   ##
=======================================
  Coverage   74.35%   74.35%           
=======================================
  Files          78       78           
  Lines        3588     3588           
=======================================
  Hits         2668     2668           
  Misses        920      920           

Impacted Files	Coverage Δ
src/compression.rs	84.61% <100.00%> (ø)

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