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fixed data packing

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This commit is contained in:
Bernd Herzog 2023-03-21 21:27:32 +01:00
parent b856b047cc
commit 7b3ab64930
2 changed files with 14 additions and 18 deletions
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28
firmware/tools/make_image_chunk.py
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@ -27,7 +27,7 @@ import struct
usage_message = """
PortaPack image chunk writer
Usage: <command> <input_binary> <four-characer tag> <output_tagged_binary> [<chunk max size>]
Usage: <command> <input_binary> <four-characer tag> <output_tagged_binary>
"""
def read_image(path):
@ -41,24 +41,29 @@ def write_image(data, path):
f.write(data)
f.close()
compressed_data_size = 0
if len(sys.argv) == 4:
input_image = read_image(sys.argv[1])
input_image = bytearray(input_image)
tag = tuple(map(ord, sys.argv[2]))
output_path = sys.argv[3]
if input_image[5] & 4 == 4:
input_image = input_image[19:]
if input_image[4] & 8 == 8:
input_image = input_image[15:]
else:
input_image = input_image[11:]
input_image = input_image[7:]
compressed_data_size = len(input_image)
if (len(input_image) & 3) != 0:
for i in range(4 - (len(input_image) & 3)):
input_image.append(0)
output_image += struct.pack('<4BI', tag[0], tag[1], tag[2], tag[3], len(input_image) - 4)
elif len(sys.argv) == 2:
input_image = bytearray()
tag = (0, 0, 0, 0)
output_path = sys.argv[1]
output_image += struct.pack('<4BI', tag[0], tag[1], tag[2], tag[3], 0)
else:
print(usage_message)
sys.exit(-1)
@ -67,15 +72,6 @@ if len(tag) != 4:
print(usage_message)
sys.exit(-2)
if (len(input_image) & 3) != 0:
input_image = bytearray(input_image)
for i in range(4 - (len(input_image) & 3)):
input_image.append(0)
output_image = bytearray()
output_image += struct.pack('<4BII', tag[0], tag[1], tag[2], tag[3], len(input_image), compressed_data_size)
output_image += input_image
write_image(output_image, output_path)