exposed fnc1 argument, meets GS1 standard

=2.3.0

@@ -0,0 +1,11 @@
+Using version ^2.27.0 for imageio
+
+Updating dependencies
+Resolving dependencies...
+
+Writing lock file
+
+Package operations: 2 installs, 0 updates, 0 removals
+
+  • Installing pillow (9.5.0)
+  • Installing imageio (2.27.0)

=3.2.0

@@ -0,0 +1,8 @@
+Using version ^9.5.0 for Pillow
+
+Updating dependencies
+Resolving dependencies...
+
+Writing lock file
+
+No dependencies to install or update

pylibdmtx/pylibdmtx.py

@@ -52,6 +52,8 @@
     32: DmtxPackOrder.DmtxPack32bppRGBX,
 }
 
+FNC1_VAL = '\xe8'
+
 
 @contextmanager
 def _image(pixels, width, height, pack):
@@ -313,7 +315,7 @@ def _encoder():
         dmtxEncodeDestroy(byref(encoder))
 
 
-def encode(data, scheme=None, size=None):
+def encode(data, scheme=None, size=None, fnc1=False, module=1, margin=0):
     """
     Encodes `data` in a DataMatrix image.
 
@@ -325,6 +327,9 @@ def encode(data, scheme=None, size=None):
             If `None`, defaults to 'Ascii'.
         size: image dimensions - one of `ENCODING_SIZE_NAMES`, or `None`.
             If `None`, defaults to 'ShapeAuto'.
+        fnc1: (T/F) whether to generate GS1 datamatrix
+        module: pixels per module
+        margin: pixels on margin (blank)
 
     Returns:
         Encoded: with properties `(width, height, bpp, pixels)`.
@@ -356,9 +361,16 @@ def encode(data, scheme=None, size=None):
         )
     scheme = getattr(DmtxScheme, scheme_name)
 
+    if fnc1:
+        data = b'\xe8' + data
+
     with _encoder() as encoder:
         dmtxEncodeSetProp(encoder, DmtxProperty.DmtxPropScheme, scheme)
         dmtxEncodeSetProp(encoder, DmtxProperty.DmtxPropSizeRequest, size)
+        if fnc1:
+            dmtxEncodeSetProp(encoder, DmtxProperty.DmtxPropFnc1, 0xe8)
+        dmtxEncodeSetProp(encoder, DmtxProperty.DmtxPropModuleSize, module)
+        dmtxEncodeSetProp(encoder, DmtxProperty.DmtxPropMarginSize, margin)
 
         if dmtxEncodeDataMatrix(encoder, len(data), cast(data, c_ubyte_p)) == 0:
             raise PyLibDMTXError(

pyproject.toml

@@ -0,0 +1,17 @@
+[tool.poetry]
+name = "pylibdmtx"
+version = "0.1.1"
+description = "Pylibdmtx fork, with FNC1, margin, and module size exposure."
+authors = ["matt <matt@appliedinvention.com>"]
+readme = "README.rst"
+
+[tool.poetry.dependencies]
+python = "^3.10"
+numpy = "^1.24.2"
+imageio = "^2.27.0"
+Pillow = "^9.5.0"
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+