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The total number of input bytes read so far.

std::size_t total_in = 0;

This field is set by the compression library and must not be updated by the application.

This field can also be used for statistics or progress reports.

After compression, total_in holds the total size of the uncompressed data and may be saved for use by the decompressor (particularly if the decompressor wants to decompress everything in a single step).