add functions to convert mlarrow <-> pyarrow

Author: sgilmore10

matlab/src/matlab/+arrow/+c/+internal/FFIWrapper.py

@@ -0,0 +1,19 @@
+from pyarrow.cffi import ffi
+
+class FFIWrapper:
+    def __init__(self, cdata):
+        self.cdata = cdata
+    
+    def getAddress(self):
+        address = int(ffi.cast("uintptr_t", self.cdata))
+        return address
+
+cArray = ffi.new("struct ArrowArray*")
+cSchema = ffi.new("struct ArrowSchema*")
+
+cArrayWrapper = FFIWrapper(cArray)
+cSchemaWrapper = FFIWrapper(cSchema)
+
+
+
+

matlab/src/matlab/+arrow/+c/mlarrow2pyarrow.m

@@ -0,0 +1,13 @@
+function pyarrowArray = mlarrow2pyarrow(mlarrowArray)
+    [cArrayWrapper, cSchemaWrapper] = pyrunfile(fullfile(pwd, "+internal/FFIWrapper.py"), ["cArrayWrapper" "cSchemaWrapper"]);
+
+    cArrayAddress = uint64(cArrayWrapper.getAddress());
+    cSchemaAdress = uint64(cSchemaWrapper.getAddress());
+
+    mlarrowArray.exportToC(cArrayAddress, cSchemaAdress);
+
+    dummyArray = py.pyarrow.array([1 2]);
+    importFunc = py.getattr(dummyArray, "_import_from_c");
+    pyarrowArray = importFunc(cArrayAddress, cSchemaAdress);
+end
+

matlab/src/matlab/+arrow/+c/pyarrow2mlarrow.m

@@ -0,0 +1,10 @@
+function mlarrowArray = pyarrow2mlarrow(pyarrowArray)
+    cArray = arrow.c.ArrayCStruct;
+    cSchema = arrow.c.SchemaCStruct;
+
+    exportFunc = py.getattr(pyarrowArray, "_export_to_c");
+    exportFunc(cArray.Address, cSchema.Address);
+
+    mlarrowArray = arrow.array.Array.importFromC(cArray, cSchema);
+
+end