[PATCH RFC] bareboxtlv-generator: add raw "bytes"-format

[PATCH RFC] bareboxtlv-generator: add raw "bytes"-format

[Jonas Rebmann]

Stores a byte sequence up to the maximum supported length of 65'535
bytes, encoded from and decoded to a hexadecimal representation.

Whitespace in the input string is skipped, allowing for arbitrary
grouping of the hexadecimal digits in the yaml input data.

Signed-off-by: Jonas Rebmann <jre@pengutronix.de>
---
I did not end up using this format and no mappings/parsers exist on the
barebox end. Leaving the patch here for future reference.
---
 scripts/bareboxtlv-generator/bareboxtlv-generator.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/scripts/bareboxtlv-generator/bareboxtlv-generator.py b/scripts/bareboxtlv-generator/bareboxtlv-generator.py
index aa243d8b06..1fd5a45d43 100755
--- a/scripts/bareboxtlv-generator/bareboxtlv-generator.py
+++ b/scripts/bareboxtlv-generator/bareboxtlv-generator.py
@@ -320,6 +320,18 @@ class FactoryDataset:
                 if len(bin) > 2**16 - 1:
                     raise ValueError(f"String {name} is too long!")
 
+            elif tag_format == "bytes":
+                try:
+                    bin = bytes.fromhex(value)
+                except ValueError:
+                    raise ValueError(f"{name}: Invalid hex string for bytes format")
+                if "length" in tag:
+                    if tag["length"]!=len(bin):
+                        raise ValueError(f"{name}: schema requires this byte sequence to be {tag["length"]} bytes but the given sequence is {len(bin)} byte long.")
+                fmt = f"{len(bin)}s"
+                if len(bin) > 2**16 - 1:
+                    raise ValueError(f"Bytes {name} is too long!")
+
             elif tag_format == "decimal":
                 fmtl = tag["length"]
                 if fmtl == 1:
@@ -451,6 +463,8 @@ class FactoryDataset:
                 value = struct.unpack_from(fmt, bin, data_ptr)[0]
             elif tag_schema["format"] == "string":
                 value = bin[data_ptr : data_ptr + tag_len].decode("UTF-8")  # noqa E203
+            elif tag_schema["format"] == "bytes":
+                value = bin[data_ptr : data_ptr + tag_len].hex()
             elif tag_schema["format"] == "mac-sequence":
                 if tag_len != 7:
                     raise ValueError(f"Tag {name} has wrong length {hex(tag_len)} but expected 0x7.")

---
base-commit: f485ddfccf960959d25462073528d314b8bf1aea
change-id: 20251112-tlv-bytes-b007a9330be8

Best regards,
--  
Jonas Rebmann <jre@pengutronix.de>