SQLite Forum

sqlar: is it reliable to use length(sqlar.blob)==sqlar.sz determine whether the data is compressed

It says

> The file is compressed if length(sqlar.blob)<sqlar.sz and is stored as plaintext if length(sqlar.blob)==sqlar.sz.

But it also says

> the zlib format contains a two byte compression-type indentification header (0x78 0x9c) and a 4-byte checksum at the end

Could it be possible that length(sqlar.blob)==sqlar.sz in the latter case as the header/checksum can make up the length reduction of the compression?