warn -> atsign-warn, and fix loading of too-small grayscale images

src/NRRD.jl

@@ -230,7 +230,7 @@ function load(io::Stream{format"NRRD"}, Tuser::Type=Any; mode="r", mmap=:auto)
     do_mmap |= can_mmap && (mmap == true)
 
     if !compressed
-        szraw = checked_size(Traw, szraw, sz, iodata)
+        szraw, sz = checked_size(Traw, szraw, sz, iodata)
     end
 
     if do_mmap
@@ -775,7 +775,7 @@ function get_axes(header, nd)
             for idx in findall(istime)
                 labelt = axnames[idx]
                 if !istimeaxis(Axis{Symbol(labelt)})
-                    warn("label $labelt is not defined as a time axis, define it with `@traitimpl TimeAxis{Axis{:$labelt}}` (see ImageAxes for more information)")
+                    @warn("label $labelt is not defined as a time axis, define it with `@traitimpl TimeAxis{Axis{:$labelt}}` (see ImageAxes for more information)")
                 end
             end
         end
@@ -1188,10 +1188,10 @@ function checked_size(Traw, szraw, sz, iodata)
             sznew[k] = div(datalen, strds[k])
         end
         tsznew = (sznew...,)
-        warn("header indicates an array size $szraw, but the file size is consistent with at most $tsznew")
-        szraw = tsznew
+        @warn("header indicates an array size $szraw, but the file size is consistent with at most $tsznew")
+        szraw = sz = tsznew
     end
-    szraw
+    szraw, sz
 end
 
 function stream2name(s::IO)

test/runtests.jl

@@ -1,5 +1,5 @@
 using FileIO, FixedPointNumbers, ColorTypes, Unitful, AxisArrays, ImageAxes, ImageMetadata
-using Test
+using Test, Base.CoreLogging
 
 include("unu-make.jl")
 
@@ -159,6 +159,27 @@ include("unu-make.jl")
         @test pixelspacing(imgc) == (1.0u"mm", 1.2u"mm")
     end
 
+    @testset "Size warning" begin
+        for (T, Traw) in ((N0f8, UInt8), (N0f16, UInt16))
+            img = rand(T, 5, 7, 3)
+            outname = joinpath(writedir, "imagetrunc.nhdr")
+            props = Dict("datafile"=>joinpath(writedir, "imagetrunc.raw"))
+            save(outname, img, props=props)
+            # Create a too-small data array
+            open(props["datafile"], "w") do io
+                write(io, rand(Traw, 5, 7, 2))
+            end
+            # Test that it can be read but produces a warning
+            logger = Test.TestLogger()
+            with_logger(logger) do
+                imgr = load(outname)
+                @test size(imgr) == (5, 7, 2)
+            end
+            record = logger.logs[1]
+            @test occursin("header indicates an array size (5, 7, 3), but the file size is consistent with at most (5, 7, 2)", record.message)
+        end
+    end
+
     GC.gc()  # to close any mmapped files
     try
         rm(workdir, recursive=true)