Fix zip_writefile of non dense arrays

src/writer.jl

@@ -275,6 +275,7 @@ Base.write(w::ZipWriter, x::UInt8) = write(w, Ref(x))
 Base.isopen(w::WriteOffsetTracker) = !w.bad
 Base.close(w::WriteOffsetTracker) = nothing # this should never be called
 Base.isreadable(w::WriteOffsetTracker) = false
+Base.write(w::WriteOffsetTracker, x::UInt8) = write(w, Ref(x))
 
 # All writes to the underlying IO go through this function.
 # This enables ZipWriter when using zip_writefile to write to any IO that

test/test_writer.jl

@@ -430,4 +430,13 @@ end
     for T in (BigInt, UInt64, Int64)
         @test r == zip_crc32(view(data, T(2):T(90)))
     end
+end
+
+@testset "zip_writefile on non dense arrays" begin
+    out = IOBuffer()
+    ZipWriter(out) do w
+        zip_writefile(w, "data.txt", 0x01:0x0f)
+    end
+    r = ZipReader(take!(out))
+    @test zip_readentry(r, "data.txt") == 0x01:0x0f
 end