h5dump compatibility

[timholy]

I was taking a look at JuliaIO/JLD.jl#168 and noticed that it's fixed here (yay!). I went looking for clues with h5dump, and noticed that the demo in that issue, when saved as a .jld2, doesn't support h5dump.

[timholy]

h5ls seems OK, though.

[simonster]

This seems to work for me. Make sure you have HDF5 1.10 or newer; otherwise you'll get an internal error.

julia> using JLD

julia> type type1
         a::CartesianIndex{3}
       end

julia> p = (2, 3, 4)
(2, 3, 4)

julia> my_object = type1(CartesianIndex(p))
type1(CartesianIndex{3}((2, 3, 4)))

julia> save("test.jld2", "my_object", my_object)

shell> /usr/local/bin/h5dump test.jld2
HDF5 "test.jld2" {
GROUP "/" {
   GROUP "_types" {
      DATATYPE "00000001" H5T_COMPOUND {
         H5T_STRING {
            STRSIZE H5T_VARIABLE;
            STRPAD H5T_STR_NULLPAD;
            CSET H5T_CSET_UTF8;
            CTYPE H5T_C_S1;
         } "name";
         H5T_VLEN { H5T_REFERENCE { H5T_STD_REF_OBJECT }} "parameters";
      }
         ATTRIBUTE "julia_type" {
            DATATYPE  "/_types/00000001"
            DATASPACE  SCALAR
            DATA {
            (0): {
                  "Core.DataType",
                  ()
               }
            }
         }
      DATATYPE "00000002" H5T_COMPOUND {
         H5T_STD_I64LE "1";
         H5T_STD_I64LE "2";
         H5T_STD_I64LE "3";
      }
         ATTRIBUTE "julia_type" {
            DATATYPE  "/_types/00000001"
            DATASPACE  SCALAR
            DATA {
            (0): {
                  "Core.Tuple",
                  (DATASET 4449, DATASET 4449, DATASET 4449)
               }
            }
         }
      DATATYPE "00000003" H5T_COMPOUND {
         H5T_COMPOUND {
            H5T_STD_I64LE "1";
            H5T_STD_I64LE "2";
            H5T_STD_I64LE "3";
         } "I";
      }
         ATTRIBUTE "field_datatypes" {
            DATATYPE  H5T_REFERENCE { H5T_STD_REF_OBJECT }
            DATASPACE  SIMPLE { ( 1 ) / ( 1 ) }
            DATA {
            (0): DATATYPE 4312 /_types/00000002 
            }
         }
         ATTRIBUTE "julia_type" {
            DATATYPE  "/_types/00000001"
            DATASPACE  SCALAR
            DATA {
            (0): {
                  "Base.IteratorsMD.CartesianIndex",
                  (DATASET 4732)
               }
            }
         }
      DATATYPE "00000004" H5T_COMPOUND {
         H5T_COMPOUND {
            H5T_COMPOUND {
               H5T_STD_I64LE "1";
               H5T_STD_I64LE "2";
               H5T_STD_I64LE "3";
            } "I";
         } "a";
      }
         ATTRIBUTE "field_datatypes" {
            DATATYPE  H5T_REFERENCE { H5T_STD_REF_OBJECT }
            DATASPACE  SIMPLE { ( 1 ) / ( 1 ) }
            DATA {
            (0): DATATYPE 4528 /_types/00000003 
            }
         }
         ATTRIBUTE "julia_type" {
            DATATYPE  "/_types/00000001"
            DATASPACE  SCALAR
            DATA {
            (0): {
                  "type1",
                  ()
               }
            }
         }
   }
   DATASET "my_object" {
      DATATYPE  "/_types/00000004"
      DATASPACE  SCALAR
      DATA {
      (0): {
            {
               {
                  2,
                  3,
                  4
               }
            }
         }
      }
   }
}
}