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# SPDX-FileCopyrightText: 2025 Blender Authors
#
# SPDX-License-Identifier: GPL-2.0-or-later
import _blendfile_header # Not part of the Public API, allow use for testing.
import blend_render_info
import bpy
import pathlib
import sys
import unittest
import gzip
import tempfile
args = None
class BlendFileHeaderTest(unittest.TestCase):
@classmethod
def setUpClass(cls):
cls.testdir = args.testdir
def setUp(self):
self.assertTrue(self.testdir.exists(),
"Test dir {0} should exist".format(self.testdir))
def test_small_bhead_8(self):
path = self.testdir / "SmallBHead8.blend"
with gzip.open(path, "rb") as f:
header = _blendfile_header.BlendFileHeader(f)
self.assertEqual(header.magic, b"BLENDER")
self.assertEqual(header.file_format_version, 0)
self.assertEqual(header.pointer_size, 8)
self.assertTrue(header.is_little_endian)
self.assertEqual(header.version, 300)
header_struct = header.create_block_header_struct()
self.assertIs(header_struct.type, _blendfile_header.SmallBHead8)
buffer = f.read(header_struct.struct.size)
block = header_struct.parse(buffer)
self.assertEqual(block.code, b"REND")
self.assertEqual(block.len, 72)
self.assertEqual(block.old, 140732920740000)
self.assertEqual(block.SDNAnr, 0)
self.assertEqual(block.nr, 1)
self.assertEqual(blend_render_info.read_blend_rend_chunk(path), [(1, 250, "Scene")])
def test_large_bhead_8(self):
path = self.testdir / "LargeBHead8.blend"
with open(path, "rb") as f:
header = _blendfile_header.BlendFileHeader(f)
self.assertEqual(header.magic, b"BLENDER")
self.assertEqual(header.file_format_version, 1)
self.assertEqual(header.pointer_size, 8)
self.assertTrue(header.is_little_endian)
self.assertEqual(header.version, 500)
header_struct = header.create_block_header_struct()
self.assertIs(header_struct.type, _blendfile_header.LargeBHead8)
buffer = f.read(header_struct.struct.size)
block = header_struct.parse(buffer)
self.assertEqual(block.code, b"REND")
self.assertEqual(block.len, 72)
self.assertEqual(block.old, 140737488337232)
self.assertEqual(block.SDNAnr, 0)
self.assertEqual(block.nr, 1)
self.assertEqual(blend_render_info.read_blend_rend_chunk(path), [(1, 250, "Scene")])
def test_bhead_4(self):
path = self.testdir / "BHead4.blend"
with gzip.open(path, "rb") as f:
header = _blendfile_header.BlendFileHeader(f)
self.assertEqual(header.magic, b"BLENDER")
self.assertEqual(header.file_format_version, 0)
self.assertEqual(header.pointer_size, 4)
self.assertTrue(header.is_little_endian)
self.assertEqual(header.version, 260)
header_struct = header.create_block_header_struct()
self.assertIs(header_struct.type, _blendfile_header.BHead4)
buffer = f.read(header_struct.struct.size)
block = header_struct.parse(buffer)
self.assertEqual(block.code, b"REND")
self.assertEqual(block.len, 32)
self.assertEqual(block.old, 2684488)
self.assertEqual(block.SDNAnr, 0)
self.assertEqual(block.nr, 1)
self.assertEqual(blend_render_info.read_blend_rend_chunk(path), [(1, 250, "Space types")])
def test_bhead_4_big_endian(self):
path = self.testdir / "BHead4_big_endian.blend"
with gzip.open(path, "rb") as f:
header = _blendfile_header.BlendFileHeader(f)
self.assertEqual(header.magic, b"BLENDER")
self.assertEqual(header.file_format_version, 0)
self.assertEqual(header.pointer_size, 4)
self.assertFalse(header.is_little_endian)
self.assertEqual(header.version, 170)
header_struct = header.create_block_header_struct()
self.assertIs(header_struct.type, _blendfile_header.BHead4)
buffer = f.read(header_struct.struct.size)
block = header_struct.parse(buffer)
self.assertEqual(block.code, b"REND")
self.assertEqual(block.len, 32)
self.assertEqual(block.old, 2147428916)
self.assertEqual(block.SDNAnr, 0)
self.assertEqual(block.nr, 1)
self.assertEqual(blend_render_info.read_blend_rend_chunk(path), [(1, 150, "1")])
def test_current(self):
directory = tempfile.mkdtemp()
path = pathlib.Path(directory) / "test.blend"
bpy.ops.wm.read_factory_settings(use_empty=True)
scene = bpy.data.scenes[0]
scene.name = "Test Scene"
scene.frame_start = 10
scene.frame_end = 20
bpy.ops.wm.save_as_mainfile(filepath=str(path), compress=False, copy=True)
version = bpy.app.version
version_int = version[0] * 100 + version[1]
with open(path, "rb") as f:
header = _blendfile_header.BlendFileHeader(f)
self.assertEqual(header.magic, b"BLENDER")
self.assertEqual(header.file_format_version, 1)
self.assertEqual(header.pointer_size, 8)
self.assertTrue(header.is_little_endian)
self.assertEqual(header.version, version_int)
header_struct = header.create_block_header_struct()
self.assertIs(header_struct.type, _blendfile_header.LargeBHead8)
buffer = f.read(header_struct.struct.size)
block = header_struct.parse(buffer)
self.assertEqual(block.code, b"REND")
self.assertEqual(blend_render_info.read_blend_rend_chunk(path), [(10, 20, "Test Scene")])
def main():
global args
import argparse
if '--' in sys.argv:
argv = [sys.argv[0]] + sys.argv[sys.argv.index('--') + 1:]
else:
argv = sys.argv
parser = argparse.ArgumentParser()
parser.add_argument('--testdir', required=True, type=pathlib.Path)
args, remaining = parser.parse_known_args(argv)
unittest.main(argv=remaining)
if __name__ == "__main__":
main()
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