Repaired archive can be incomplete

[extiop]

The repair action with mlar uses brotli::BrotliDecompressStream in Read impl for CompressionLayerFailSafeReader. While needing more input (brotli::BrotliResult::NeedsMoreInput) brotli can return an output_offset of 0 which is considered as there is no more bytes to read in the current implementation of MLA (compress layer, notably the read()). This is problematic as it can cut some archives before their end.

One workaround is to read again (could be multiple times) but it's only a workaround.

Two possible solutions could be:

• to check that brotli decompressed nothing with other returned values such as available_out or written as it needs more input, so we continue reading ;
• patch this behavior in brotli, according to their requirements. This one is preferred as MLA would be totally in line with the spec of Read (https://doc.rust-lang.org/nightly/std/io/trait.Read.html#required-methods) .