transcode failing if codec is initialized

[garborg]

This looks current in the doc, but no longer (I believe this is a pattern I used before) works for me:

   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.3.0 (2019-11-26)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> using Pkg; Pkg.status()
Project HH v0.1.0
    Status `~/src/bitbucket.org/garborg/HH/Project.toml`
  [4f18b42c] BusinessDays v0.9.6
  [944b1d66] CodecZlib v0.6.0
  [34da2185] Compat v3.2.0
  [864edb3b] DataStructures v0.17.9
  [cd3eb016] HTTP v0.8.8
  [682c06a0] JSON v0.21.0
  [6ac74813] MD5 v0.2.1
  [295af30f] Revise v2.5.0
  [ade2ca70] Dates 

julia> using CodecZlib: transcode, GzipCompressor

julia> bytes = codeunits("asfjkl")
6-element Base.CodeUnits{UInt8,String}:
 0x61
 0x73
 0x66
 0x6a
 0x6b
 0x6c

julia> transcode(GzipCompressor, bytes)
26-element Array{UInt8,1}:
 0x1f
 0x8b
 0x08
 0x00
 0x00
 0x00
 0x00
 0x00
 0x00
 0x03
 0x4b
 0x2c
 0x4e
 0xcb
 0xca
 0xce
 0x01
 0x00
 0x75
 0x9e
 0x18
 0x55
 0x06
 0x00
 0x00
 0x00

julia> transcode(GzipCompressor(), bytes)
ERROR: zlib error: <no message> (code: -2)
Stacktrace:
 [1] transcode(::GzipCompressor, ::Base.CodeUnits{UInt8,String}) at /home/sean/.julia/packages/TranscodingStreams/MsN8d/src/transcode.jl:121
 [2] top-level scope at REPL[5]:1

[ovgeorge]

I'm having the same issue. Had you found any solutions?

[garborg]

I didn't, other than using transcode(GzipCompressor, bytes) (forgoing tuning the parameters) or shelling out. I'm not actually using it now, so I didn't dig.

[evetion]

The docs could use updating, I found the following by inspecting https://github.com/JuliaIO/TranscodingStreams.jl

gzip = GzipCompressor(level=9)
initialize(gzip)  # required
transcode(gzip, bytes)
finalize(gzip)  # required