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Fix Intel headers with 512-byte padding (lost to time...)

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This commit is contained in:
RichardG867
2022-04-22 18:19:45 -03:00
parent 385f457c69
commit 4ba4f14945
1 changed files with 5 additions and 4 deletions
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9
biostools/extractors.py
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@@ -1377,10 +1377,10 @@ class IntelExtractor(Extractor):
# Determine header-related sizes and offsets.
start_offset = (file_header[90:95] != b'FLASH') and 512 or 0
version = util.read_string(file_header[start_offset + 112:]) # null-terminated string...
header_size = 112 + len(version) + 1
remaining = header_size & 31
if remaining: # ...aligning the header to 32 bytes
version = util.read_string(file_header[start_offset + 112:]) # this assumes the chain name is less than 32 characters
header_size = 112 + len(version) + 1 # and the logical area name is less than 24 characters,
remaining = header_size & 31 # but there's no fast detection of Intel files otherwise
if remaining: # padded to 32 bytes
header_size += 32 - remaining
part_data_offset = start_offset + header_size
@@ -1427,6 +1427,7 @@ class IntelExtractor(Extractor):
logical_area = dest_offset = 0
logical_area_size = data_length = found_part_size
else:
f.seek(start_offset)
header = f.read(part_data_offset)
logical_area, logical_area_size = struct.unpack('<BI', header[32:37])
dest_offset, data_length, _, last_part = struct.unpack('<IIBB', header[80:90])