Merge pull request #494 from martindurant/hdf4

Maybe support hdf4

docs/source/reference.rst

@@ -10,6 +10,7 @@ File format backends
    kerchunk.fits.process_file
    kerchunk.tiff.tiff_to_zarr
    kerchunk.netCDF3.NetCDF3ToZarr
+   kerchunk.hdf4.HDF4ToZarr
 
 .. autoclass:: kerchunk.hdf.SingleHdf5ToZarr
     :members:
@@ -24,6 +25,9 @@ File format backends
 .. autoclass:: kerchunk.netCDF3.NetCDF3ToZarr
     :members: __init__, translate
 
+.. autoclass:: kerchunk.hdf4.HDF4ToZarr
+    :members: __init__, translate
+
 Codecs
 ------
 
@@ -50,6 +54,9 @@ Codecs
 .. autoclass:: kerchunk.codecs.RecordArrayMember
     :members: __init__
 
+.. autoclass:: kerchunk.codecs.ZlibCodec
+    :members: __init__
+
 Combining
 ---------
 

kerchunk/codecs.py

@@ -5,6 +5,7 @@
 from numcodecs.abc import Codec
 import numpy as np
 import threading
+import zlib
 
 
 class FillStringsCodec(Codec):
@@ -238,3 +239,19 @@ def decode(self, buf, out=None):
 
     def encode(self, buf):
         raise NotImplementedError
+
+
+class ZlibCodec(Codec):
+    codec_id = "zlib"
+
+    def __init__(self):
+        ...
+
+    def decode(self, data, out=None):
+        if out:
+            out[:] = zlib.decompress(data)
+            return out
+        return zlib.decompress(data)
+
+    def encode(self, buf):
+        return zlib.compress(buf)