Define nb_available for ZipFile.ReadableFile

[felipenoris]

I'm hitting this error when reading a XML file with EzXML.jl , when the XML is inside a zip file.

ERROR: MethodError: no method matching nb_available(::ZipFile.ReadableFile)

Is it possible to define this function?

[felipenoris]

This is the testing script:

julia> using EzXML, ZipFile

julia> filepath="general.xlsx"; xlfile = ZipFile.Reader(filepath); f1=xlfile.files[1]
ZipFile.ReadableFile(name=[Content_Types].xml, method=Deflate, uncompresssedsize=2521, compressedsize=396, mtime=3.155436e8)

julia> doc = EzXML.readxml(f1)
ERROR: MethodError: no method matching nb_available(::ZipFile.ReadableFile)
Closest candidates are:
  nb_available(::Base.Filesystem.File) at filesystem.jl:162
  nb_available(::BufferStream) at stream.jl:1155
  nb_available(::IOStream) at iostream.jl:185
  ...
Stacktrace:
 [1] (::EzXML.##7#8)(::Ptr{Void}, ::Ptr{UInt8}, ::Int32) at /home/felipenoris/.julia/v0.6/EzXML/src/document.jl:203
 [2] macro expansion at /home/felipenoris/.julia/v0.6/EzXML/src/error.jl:50 [inlined]
 [3] readxml(::ZipFile.ReadableFile) at /home/felipenoris/.julia/v0.6/EzXML/src/document.jl:141

The file general.xlsx can be any Excel file.

cc @bicycle1885

[fhs]

I think nb_available can be just be f.uncompressedsize - f._pos. See the read function:

ZipFile.jl/src/ZipFile.jl

Line 453 in 2811b56

if eof(f) || f._pos+length(a)*sizeof(T) > f.uncompressedsize

That's assuming the uncompressed size is accurate in the metadata. Maybe it's better to call Zlib's nb_available (if it's even available)? I'd need to look into it in more detail.

[felipenoris]

@fhs , thanks! That actually worked!

Base.nb_available(f::ZipFile.ReadableFile) = f.uncompressedsize - f._pos