Assuming your decompressor is as capable as gzip(1) is, you don't need to write your own compressor or rely on block alignment, because: • pigz (https://github

Assuming your decompressor is as capable as gzip(1) is, you don't need to write your own compressor or rely on block alignment, because: • pigz (https://github.com/madler/pigz https://github.com/madler/pigz) has -0 for no-compression compression; • you can concat multiple gzip files together. $ echo foo | gzip > foobar.gz $ echo bar | pigz -0 >> foobar.gz $ echo baz | gzip >> foobar.gz $ hd foobar.gz | grep -C1 -w bar 00000010 a8 65 32 7e 04 00 00 00 1f 8b 08 00 70 bf 8c 63 |.e2~........p..c| 00000020 00 03 01 04 00 fb ff 62 61 72 0a e9 b3 a2 04 04 |.......bar......| 00000030 00 00 00 1f 8b 08 00 00 00 00 00 00 03 4b 4a ac |.............KJ.| $ gzip -d < foobar.gz foo bar baz This also solves the CRC problem, because pigz computes the checksum for you.