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Pass complete header info to individual decompressors

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dgelessus 2019-09-23 23:19:20 +02:00
parent 9dbdf5b827
commit 53e73be980
4 changed files with 8 additions and 8 deletions
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4
rsrcfork/compress/__init__.py
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@ -18,7 +18,7 @@ def _decompress_application(data: bytes, header_info: CompressedApplicationHeade
else: else:
raise DecompressError(f"Unsupported 'dcmp' ID: {header_info.dcmp_id}, expected 0 or 1") raise DecompressError(f"Unsupported 'dcmp' ID: {header_info.dcmp_id}, expected 0 or 1")
return decompress_func(data, header_info.decompressed_length, debug=debug) return decompress_func(header_info, data, debug=debug)
def _decompress_system(data: bytes, header_info: CompressedSystemHeaderInfo, *, debug: bool=False) -> bytes: def _decompress_system(data: bytes, header_info: CompressedSystemHeaderInfo, *, debug: bool=False) -> bytes:
@ -27,7 +27,7 @@ def _decompress_system(data: bytes, header_info: CompressedSystemHeaderInfo, *,
else: else:
raise DecompressError(f"Unsupported 'dcmp' ID: {header_info.dcmp_id}, expected 2") raise DecompressError(f"Unsupported 'dcmp' ID: {header_info.dcmp_id}, expected 2")
return decompress_func(data, header_info.decompressed_length, header_info.parameters, debug=debug) return decompress_func(header_info, data, debug=debug)
def decompress(data: bytes, *, debug: bool=False) -> bytes: def decompress(data: bytes, *, debug: bool=False) -> bytes:

4
rsrcfork/compress/dcmp0.py
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@ -36,7 +36,7 @@ TABLE = [TABLE_DATA[i:i + 2] for i in range(0, len(TABLE_DATA), 2)]
assert len(TABLE) == len(range(0x4b, 0xfe)) assert len(TABLE) == len(range(0x4b, 0xfe))
def decompress(data: bytes, decompressed_length: int, *, debug: bool=False) -> bytes: def decompress(header_info: common.CompressedApplicationHeaderInfo, data: bytes, *, debug: bool=False) -> bytes:
"""Decompress compressed data in the format used by 'dcmp' (0).""" """Decompress compressed data in the format used by 'dcmp' (0)."""
prev_literals = [] prev_literals = []
@ -287,7 +287,7 @@ def decompress(data: bytes, decompressed_length: int, *, debug: bool=False) -> b
else: else:
raise common.DecompressError(f"Unknown tag byte: 0x{data[i]:>02x}") raise common.DecompressError(f"Unknown tag byte: 0x{data[i]:>02x}")
if decompressed_length % 2 != 0 and len(decompressed) == decompressed_length + 1: if header_info.decompressed_length % 2 != 0 and len(decompressed) == header_info.decompressed_length + 1:
# Special case: if the decompressed data length stored in the header is odd and one less than the length of the actual decompressed data, drop the last byte. # Special case: if the decompressed data length stored in the header is odd and one less than the length of the actual decompressed data, drop the last byte.
# This is necessary because nearly all codes generate data in groups of 2 or 4 bytes, so it is basically impossible to represent data with an odd length using this compression format. # This is necessary because nearly all codes generate data in groups of 2 or 4 bytes, so it is basically impossible to represent data with an odd length using this compression format.
decompressed = decompressed[:-1] decompressed = decompressed[:-1]

2
rsrcfork/compress/dcmp1.py
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@ -19,7 +19,7 @@ TABLE = [TABLE_DATA[i:i + 2] for i in range(0, len(TABLE_DATA), 2)]
assert len(TABLE) == len(range(0xd5, 0xfe)) assert len(TABLE) == len(range(0xd5, 0xfe))
def decompress(data: bytes, decompressed_length: int, *, debug: bool=False) -> bytes: def decompress(header_info: common.CompressedApplicationHeaderInfo, data: bytes, *, debug: bool=False) -> bytes:
"""Decompress compressed data in the format used by 'dcmp' (1).""" """Decompress compressed data in the format used by 'dcmp' (1)."""
prev_literals = [] prev_literals = []

6
rsrcfork/compress/dcmp2.py
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@ -131,10 +131,10 @@ def _decompress_system_tagged(data: bytes, decompressed_length: int, table: typi
return b"".join(parts) return b"".join(parts)
def decompress(data: bytes, decompressed_length: int, parameters: bytes, *, debug: bool=False) -> bytes: def decompress(header_info: common.CompressedSystemHeaderInfo, data: bytes, *, debug: bool=False) -> bytes:
"""Decompress compressed data in the format used by 'dcmp' (2).""" """Decompress compressed data in the format used by 'dcmp' (2)."""
unknown, table_count_m1, flags_raw = STRUCT_PARAMETERS.unpack(parameters) unknown, table_count_m1, flags_raw = STRUCT_PARAMETERS.unpack(header_info.parameters)
if debug: if debug:
print(f"Value of unknown parameter field: 0x{unknown:>04x}") print(f"Value of unknown parameter field: 0x{unknown:>04x}")
@ -172,4 +172,4 @@ def decompress(data: bytes, decompressed_length: int, parameters: bytes, *, debu
else: else:
decompress_func = _decompress_system_untagged decompress_func = _decompress_system_untagged
return decompress_func(data[data_start:], decompressed_length, table, debug=debug) return decompress_func(data[data_start:], header_info.decompressed_length, table, debug=debug)