add uuids to TiffFile (#67)

This field is helpful for OMETIFF because it allows proper tracking of
files even if filenames have been changed. Needed for
tlnagy/OMETIFF.jl#12

Project.toml

@@ -14,16 +14,17 @@ Inflate = "d25df0c9-e2be-5dd7-82c8-3ad0b3e990b9"
 OffsetArrays = "6fe1bfb0-de20-5000-8ca7-80f57d26f881"
 PkgVersion = "eebad327-c553-4316-9ea0-9fa01ccd7688"
 ProgressMeter = "92933f4c-e287-5a05-a399-4b506db050ca"
+UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 
 [compat]
 ColorTypes = "0.10, 0.11"
+DataStructures = "0.18"
 DocStringExtensions = "0.8.3"
 FileIO = "1"
 FixedPointNumbers = "0.8"
 IndirectArrays = "0.5.1, 1"
 Inflate = "0.1.2"
 OffsetArrays = "1"
-DataStructures = "0.18"
 PkgVersion = "0.1.1"
 ProgressMeter = "1"
 julia = "1.3"

src/TiffImages.jl

@@ -15,6 +15,7 @@ using PkgVersion
 using ProgressMeter
 using Base.Iterators
 using Inflate
+using UUIDs
 
 const PKGVERSION = @PkgVersion.Version 0
 

src/files.jl

@@ -6,6 +6,9 @@ Wrap `io` with helper parameters to keep track of file attributes.
 $(FIELDS)
 """
 mutable struct TiffFile{O <: Unsigned, S <: Stream}
+    """A unique identifier for this file"""
+    uuid::Union{UUID, Nothing}
+
     """The relative path to this file"""
     filepath::String
 
@@ -19,7 +22,7 @@ mutable struct TiffFile{O <: Unsigned, S <: Stream}
     need_bswap::Bool
 end
 
-TiffFile{O}(s::Stream) where O <: Unsigned = TiffFile{O, typeof(s)}("", s, -1, false)
+TiffFile{O}(s::Stream) where O <: Unsigned = TiffFile{O, typeof(s)}(nothing, "", s, -1, false)
 TiffFile{O}(io::IO) where O <: Unsigned    = TiffFile{O}(getstream(format"TIFF", io))
 TiffFile{O}() where O <: Unsigned          = TiffFile{O}(IOBuffer())
 
@@ -30,7 +33,7 @@ function Base.read(io::Stream, ::Type{TiffFile})
     offset_size = offsetsize(io)
     first_offset_raw = read(io, offset_size)
     first_offset = Int(bs ? bswap(first_offset_raw) : first_offset_raw)
-    TiffFile{offset_size, typeof(io)}(filepath, io, first_offset, bs)
+    TiffFile{offset_size, typeof(io)}(nothing, filepath, io, first_offset, bs)
 end
 
 Base.read(io::IOStream, t::Type{TiffFile}) = read(getstream(format"TIFF", io, extract_filename(io)), t)