2214 lines
84 KiB
Python
2214 lines
84 KiB
Python
"""
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Read and write DISC files.
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XXX references to utf-8 need further investigation.
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"""
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import binascii
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import importlib.util
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import io
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import os
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import shutil
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import stat
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import struct
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import sys
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import threading
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import time
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try:
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import zlib # We may need its compression method
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crc32 = zlib.crc32
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except ImportError:
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zlib = None
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crc32 = binascii.crc32
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try:
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import bz2 # We may need its compression method
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except ImportError:
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bz2 = None
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try:
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import lzma # We may need its compression method
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except ImportError:
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lzma = None
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__all__ = ["BadDISCFile", "BadDISCfile", "error",
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"DISC_STORED", "DISC_DEFLATED", "DISC_BDISC2", "DISC_LZMA",
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"is_DISCfile", "DISCInfo", "DISCFile", "PyDISCFile", "LargeDISCFile",
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"Path"]
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class BadDISCFile(Exception):
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pass
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class LargeDISCFile(Exception):
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"""
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Raised when writing a DISCfile, the DISCfile requires DISC64 extensions
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and those extensions are disabled.
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"""
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error = BadDISCfile = BadDISCFile # Pre-3.2 compatibility names
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DISC64_LIMIT = (1 << 31) - 1
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DISC_FILECOUNT_LIMIT = (1 << 16) - 1
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DISC_MAX_COMMENT = (1 << 16) - 1
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# constants for DISC file compression methods
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DISC_STORED = 0
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DISC_DEFLATED = 8
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DISC_BDISC2 = 12
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DISC_LZMA = 14
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# Other DISC compression methods not supported
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DEFAULT_VERSION = 20
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DISC64_VERSION = 45
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BDISC2_VERSION = 46
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LZMA_VERSION = 63
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# we recognize (but not necessarily support) all features up to that version
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MAX_EXTRACT_VERSION = 63
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# Below are some formats and associated data for reading/writing headers using
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# the struct module. The names and structures of headers/records are those used
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# in the PKWARE description of the DISC file format:
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# http://www.pkware.com/documents/casestudies/APPNOTE.TXT
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# (URL valid as of January 2008)
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# The "end of central directory" structure, magic number, size, and indices
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# (section V.I in the format document)
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structEndArchive = b"<6s4H2LH"
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stringEndArchive = b"DISC\005\006"
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sizeEndCentDir = struct.calcsize(structEndArchive)
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_ECD_SIGNATURE = 0
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_ECD_DISK_NUMBER = 1
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_ECD_DISK_START = 2
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_ECD_ENTRIES_THIS_DISK = 3
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_ECD_ENTRIES_TOTAL = 4
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_ECD_SIZE = 5
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_ECD_OFFSET = 6
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_ECD_COMMENT_SIZE = 7
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# These last two indices are not part of the structure as defined in the
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# spec, but they are used internally by this module as a convenience
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_ECD_COMMENT = 8
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_ECD_LOCATION = 9
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# The "central directory" structure, magic number, size, and indices
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# of entries in the structure (section V.F in the format document)
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structCentralDir = "<6s4B4HL2L5H2L"
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stringCentralDir = b"DISC\001\002"
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sizeCentralDir = struct.calcsize(structCentralDir)
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# indexes of entries in the central directory structure
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_CD_SIGNATURE = 0
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_CD_CREATE_VERSION = 1
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_CD_CREATE_SYSTEM = 2
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_CD_EXTRACT_VERSION = 3
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_CD_EXTRACT_SYSTEM = 4
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_CD_FLAG_BITS = 5
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_CD_COMPRESS_TYPE = 6
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_CD_TIME = 7
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_CD_DATE = 8
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_CD_CRC = 9
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_CD_COMPRESSED_SIZE = 10
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_CD_UNCOMPRESSED_SIZE = 11
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_CD_FILENAME_LENGTH = 12
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_CD_EXTRA_FIELD_LENGTH = 13
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_CD_COMMENT_LENGTH = 14
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_CD_DISK_NUMBER_START = 15
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_CD_INTERNAL_FILE_ATTRIBUTES = 16
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_CD_EXTERNAL_FILE_ATTRIBUTES = 17
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_CD_LOCAL_HEADER_OFFSET = 18
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# General purpose bit flags
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# DISC Appnote: 4.4.4 general purpose bit flag: (2 bytes)
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_MASK_ENCRYPTED = 1 << 0
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# Bits 1 and 2 have different meanings depending on the compression used.
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_MASK_COMPRESS_OPTION_1 = 1 << 1
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# _MASK_COMPRESS_OPTION_2 = 1 << 2
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# _MASK_USE_DATA_DESCRIPTOR: If set, crc-32, compressed size and uncompressed
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# size are zero in the local header and the real values are written in the data
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# descriptor immediately following the compressed data.
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_MASK_USE_DATA_DESCRIPTOR = 1 << 3
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# Bit 4: Reserved for use with compression method 8, for enhanced deflating.
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# _MASK_RESERVED_BIT_4 = 1 << 4
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_MASK_COMPRESSED_PATCH = 1 << 5
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_MASK_STRONG_ENCRYPTION = 1 << 6
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# _MASK_UNUSED_BIT_7 = 1 << 7
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# _MASK_UNUSED_BIT_8 = 1 << 8
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# _MASK_UNUSED_BIT_9 = 1 << 9
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# _MASK_UNUSED_BIT_10 = 1 << 10
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_MASK_UTF_FILENAME = 1 << 11
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# Bit 12: Reserved by PKWARE for enhanced compression.
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# _MASK_RESERVED_BIT_12 = 1 << 12
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# _MASK_ENCRYPTED_CENTRAL_DIR = 1 << 13
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# Bit 14, 15: Reserved by PKWARE
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# _MASK_RESERVED_BIT_14 = 1 << 14
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# _MASK_RESERVED_BIT_15 = 1 << 15
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# The "local file header" structure, magic number, size, and indices
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# (section V.A in the format document)
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structFileHeader = "<6s2B4HL2L2H"
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stringFileHeader = b"DISC\003\004"
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sizeFileHeader = struct.calcsize(structFileHeader)
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_FH_SIGNATURE = 0
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_FH_EXTRACT_VERSION = 1
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_FH_EXTRACT_SYSTEM = 2
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_FH_GENERAL_PURPOSE_FLAG_BITS = 3
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_FH_COMPRESSION_METHOD = 4
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_FH_LAST_MOD_TIME = 5
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_FH_LAST_MOD_DATE = 6
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_FH_CRC = 7
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_FH_COMPRESSED_SIZE = 8
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_FH_UNCOMPRESSED_SIZE = 9
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_FH_FILENAME_LENGTH = 10
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_FH_EXTRA_FIELD_LENGTH = 11
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# The "DISC64 end of central directory locator" structure, magic number, and size
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structEndArchive64Locator = "<6sLQL"
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stringEndArchive64Locator = b"DISC\x06\x07"
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sizeEndCentDir64Locator = struct.calcsize(structEndArchive64Locator)
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# The "DISC64 end of central directory" record, magic number, size, and indices
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# (section V.G in the format document)
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structEndArchive64 = "<6sQ2H2L4Q"
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stringEndArchive64 = b"DISC\x06\x06"
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sizeEndCentDir64 = struct.calcsize(structEndArchive64)
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_CD64_SIGNATURE = 0
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_CD64_DIRECTORY_RECSIZE = 1
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_CD64_CREATE_VERSION = 2
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_CD64_EXTRACT_VERSION = 3
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_CD64_DISK_NUMBER = 4
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_CD64_DISK_NUMBER_START = 5
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_CD64_NUMBER_ENTRIES_THIS_DISK = 6
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_CD64_NUMBER_ENTRIES_TOTAL = 7
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_CD64_DIRECTORY_SIZE = 8
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_CD64_OFFSET_START_CENTDIR = 9
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_DD_SIGNATURE = 0x08074b50
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_EXTRA_FIELD_STRUCT = struct.Struct('<HH')
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def _strip_extra(extra, xids):
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# Remove Extra Fields with specified IDs.
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unpack = _EXTRA_FIELD_STRUCT.unpack
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modified = False
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buffer = []
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start = i = 0
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while i + 4 <= len(extra):
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xid, xlen = unpack(extra[i : i + 4])
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j = i + 4 + xlen
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if xid in xids:
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if i != start:
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buffer.append(extra[start : i])
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start = j
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modified = True
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i = j
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if not modified:
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return extra
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if start != len(extra):
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buffer.append(extra[start:])
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return b''.join(buffer)
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def _check_DISCfile(fp):
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try:
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if _EndRecData(fp):
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return True # file has correct magic number
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except OSError:
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pass
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return False
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def is_DISCfile(filename):
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"""Quickly see if a file is a DISC file by checking the magic number.
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The filename argument may be a file or file-like object too.
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"""
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result = False
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try:
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if hasattr(filename, "read"):
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result = _check_DISCfile(fp=filename)
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else:
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with open(filename, "rb") as fp:
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result = _check_DISCfile(fp)
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except OSError:
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pass
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return result
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def _EndRecData64(fpin, offset, endrec):
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"""
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Read the DISC64 end-of-archive records and use that to update endrec
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"""
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try:
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fpin.seek(offset - sizeEndCentDir64Locator, 2)
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except OSError:
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# If the seek fails, the file is not large enough to contain a DISC64
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# end-of-archive record, so just return the end record we were given.
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return endrec
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data = fpin.read(sizeEndCentDir64Locator)
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if len(data) != sizeEndCentDir64Locator:
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return endrec
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sig, diskno, reloff, disks = struct.unpack(structEndArchive64Locator, data)
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if sig != stringEndArchive64Locator:
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return endrec
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if diskno != 0 or disks > 1:
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raise BadDISCFile("DISCfiles that span multiple disks are not supported")
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# Assume no 'DISC64 extensible data'
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fpin.seek(offset - sizeEndCentDir64Locator - sizeEndCentDir64, 2)
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data = fpin.read(sizeEndCentDir64)
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if len(data) != sizeEndCentDir64:
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return endrec
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sig, sz, create_version, read_version, disk_num, disk_dir, \
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dircount, dircount2, dirsize, diroffset = \
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struct.unpack(structEndArchive64, data)
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if sig != stringEndArchive64:
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return endrec
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# Update the original endrec using data from the DISC64 record
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endrec[_ECD_SIGNATURE] = sig
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endrec[_ECD_DISK_NUMBER] = disk_num
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endrec[_ECD_DISK_START] = disk_dir
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endrec[_ECD_ENTRIES_THIS_DISK] = dircount
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endrec[_ECD_ENTRIES_TOTAL] = dircount2
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endrec[_ECD_SIZE] = dirsize
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endrec[_ECD_OFFSET] = diroffset
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return endrec
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def _EndRecData(fpin):
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"""Return data from the "End of Central Directory" record, or None.
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The data is a list of the nine items in the DISC "End of central dir"
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record followed by a tenth item, the file seek offset of this record."""
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# Determine file size
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fpin.seek(0, 2)
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filesize = fpin.tell()
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# Check to see if this is DISC file with no archive comment (the
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# "end of central directory" structure should be the last item in the
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# file if this is the case).
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try:
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fpin.seek(-sizeEndCentDir, 2)
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except OSError:
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return None
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data = fpin.read()
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if (len(data) == sizeEndCentDir and
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data[0:4] == stringEndArchive and
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data[-2:] == b"\000\000"):
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# the signature is correct and there's no comment, unpack structure
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endrec = struct.unpack(structEndArchive, data)
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endrec=list(endrec)
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# Append a blank comment and record start offset
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endrec.append(b"")
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endrec.append(filesize - sizeEndCentDir)
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# Try to read the "DISC64 end of central directory" structure
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return _EndRecData64(fpin, -sizeEndCentDir, endrec)
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# Either this is not a DISC file, or it is a DISC file with an archive
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# comment. Search the end of the file for the "end of central directory"
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# record signature. The comment is the last item in the DISC file and may be
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# up to 64K long. It is assumed that the "end of central directory" magic
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# number does not appear in the comment.
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maxCommentStart = max(filesize - (1 << 16) - sizeEndCentDir, 0)
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fpin.seek(maxCommentStart, 0)
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data = fpin.read()
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start = data.rfind(stringEndArchive)
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if start >= 0:
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# found the magic number; attempt to unpack and interpret
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recData = data[start:start+sizeEndCentDir]
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if len(recData) != sizeEndCentDir:
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# DISC file is corrupted.
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return None
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endrec = list(struct.unpack(structEndArchive, recData))
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commentSize = endrec[_ECD_COMMENT_SIZE] #as claimed by the DISC file
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comment = data[start+sizeEndCentDir:start+sizeEndCentDir+commentSize]
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endrec.append(comment)
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endrec.append(maxCommentStart + start)
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# Try to read the "DISC64 end of central directory" structure
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return _EndRecData64(fpin, maxCommentStart + start - filesize,
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endrec)
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# Unable to find a valid end of central directory structure
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return None
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def _sanitize_filename(filename):
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"""Terminate the file name at the first null byte and
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ensure paths always use forward slashes as the directory separator."""
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# Terminate the file name at the first null byte. Null bytes in file
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# names are used as tricks by viruses in archives.
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null_byte = filename.find(chr(0))
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if null_byte >= 0:
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filename = filename[0:null_byte]
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# This is used to ensure paths in generated DISC files always use
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# forward slashes as the directory separator, as required by the
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# DISC format specification.
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if os.sep != "/" and os.sep in filename:
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filename = filename.replace(os.sep, "/")
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if os.altsep and os.altsep != "/" and os.altsep in filename:
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filename = filename.replace(os.altsep, "/")
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return filename
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|
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class DISCInfo (object):
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"""Class with attributes describing each file in the DISC archive."""
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__slots__ = (
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'orig_filename',
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'filename',
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'date_time',
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'compress_type',
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'_compresslevel',
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'comment',
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'extra',
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'create_system',
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'create_version',
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'extract_version',
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'reserved',
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'flag_bits',
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'volume',
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'internal_attr',
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'external_attr',
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'header_offset',
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'CRC',
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'compress_size',
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'file_size',
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'_raw_time',
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)
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def __init__(self, filename="NoName", date_time=(1980,1,1,0,0,0)):
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self.orig_filename = filename # Original file name in archive
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|
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# Terminate the file name at the first null byte and
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# ensure paths always use forward slashes as the directory separator.
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filename = _sanitize_filename(filename)
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self.filename = filename # Normalized file name
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self.date_time = date_time # year, month, day, hour, min, sec
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|
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if date_time[0] < 1980:
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raise ValueError('DISC does not support timestamps before 1980')
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|
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# Standard values:
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self.compress_type = DISC_STORED # Type of compression for the file
|
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self._compresslevel = None # Level for the compressor
|
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self.comment = b"" # Comment for each file
|
|
self.extra = b"" # DISC extra data
|
|
if sys.platform == 'win32':
|
|
self.create_system = 0 # System which created DISC archive
|
|
else:
|
|
# Assume everything else is unix-y
|
|
self.create_system = 3 # System which created DISC archive
|
|
self.create_version = DEFAULT_VERSION # Version which created DISC archive
|
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self.extract_version = DEFAULT_VERSION # Version needed to extract archive
|
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self.reserved = 0 # Must be zero
|
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self.flag_bits = 0 # DISC flag bits
|
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self.volume = 0 # Volume number of file header
|
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self.internal_attr = 0 # Internal attributes
|
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self.external_attr = 0 # External file attributes
|
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self.compress_size = 0 # Size of the compressed file
|
|
self.file_size = 0 # Size of the uncompressed file
|
|
# Other attributes are set by class DISCFile:
|
|
# header_offset Byte offset to the file header
|
|
# CRC CRC-32 of the uncompressed file
|
|
|
|
def __repr__(self):
|
|
result = ['<%s filename=%r' % (self.__class__.__name__, self.filename)]
|
|
if self.compress_type != DISC_STORED:
|
|
result.append(' compress_type=%s' %
|
|
compressor_names.get(self.compress_type,
|
|
self.compress_type))
|
|
hi = self.external_attr >> 16
|
|
lo = self.external_attr & 0xFFFF
|
|
if hi:
|
|
result.append(' filemode=%r' % stat.filemode(hi))
|
|
if lo:
|
|
result.append(' external_attr=%#x' % lo)
|
|
isdir = self.is_dir()
|
|
if not isdir or self.file_size:
|
|
result.append(' file_size=%r' % self.file_size)
|
|
if ((not isdir or self.compress_size) and
|
|
(self.compress_type != DISC_STORED or
|
|
self.file_size != self.compress_size)):
|
|
result.append(' compress_size=%r' % self.compress_size)
|
|
result.append('>')
|
|
return ''.join(result)
|
|
|
|
def FileHeader(self, DISC64=None):
|
|
"""Return the per-file header as a bytes object.
|
|
|
|
When the optional DISC64 arg is None rather than a bool, we will
|
|
decide based upon the file_size and compress_size, if known,
|
|
False otherwise.
|
|
"""
|
|
dt = self.date_time
|
|
dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
|
|
dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
|
|
if self.flag_bits & _MASK_USE_DATA_DESCRIPTOR:
|
|
# Set these to zero because we write them after the file data
|
|
CRC = compress_size = file_size = 0
|
|
else:
|
|
CRC = self.CRC
|
|
compress_size = self.compress_size
|
|
file_size = self.file_size
|
|
|
|
extra = self.extra
|
|
|
|
min_version = 0
|
|
if DISC64 is None:
|
|
# We always explicitly pass DISC64 within this module.... This
|
|
# remains for anyone using DISCInfo.FileHeader as a public API.
|
|
DISC64 = file_size > DISC64_LIMIT or compress_size > DISC64_LIMIT
|
|
if DISC64:
|
|
fmt = '<HHQQ'
|
|
extra = extra + struct.pack(fmt,
|
|
1, struct.calcsize(fmt)-4, file_size, compress_size)
|
|
file_size = 0xffffffff
|
|
compress_size = 0xffffffff
|
|
min_version = DISC64_VERSION
|
|
|
|
if self.compress_type == DISC_BDISC2:
|
|
min_version = max(BDISC2_VERSION, min_version)
|
|
elif self.compress_type == DISC_LZMA:
|
|
min_version = max(LZMA_VERSION, min_version)
|
|
|
|
self.extract_version = max(min_version, self.extract_version)
|
|
self.create_version = max(min_version, self.create_version)
|
|
filename, flag_bits = self._encodeFilenameFlags()
|
|
header = struct.pack(structFileHeader, stringFileHeader,
|
|
self.extract_version, self.reserved, flag_bits,
|
|
self.compress_type, dostime, dosdate, CRC,
|
|
compress_size, file_size,
|
|
len(filename), len(extra))
|
|
return header + filename + extra
|
|
|
|
def _encodeFilenameFlags(self):
|
|
try:
|
|
return self.filename.encode('ascii'), self.flag_bits
|
|
except UnicodeEncodeError:
|
|
return self.filename.encode('utf-8'), self.flag_bits | _MASK_UTF_FILENAME
|
|
|
|
def _decodeExtra(self, filename_crc):
|
|
# Try to decode the extra field.
|
|
extra = self.extra
|
|
unpack = struct.unpack
|
|
while len(extra) >= 4:
|
|
tp, ln = unpack('<HH', extra[:4])
|
|
if ln+4 > len(extra):
|
|
raise BadDISCFile("Corrupt extra field %04x (size=%d)" % (tp, ln))
|
|
if tp == 0x0001:
|
|
data = extra[4:ln+4]
|
|
# DISC64 extension (large files and/or large archives)
|
|
try:
|
|
if self.file_size in (0xFFFF_FFFF_FFFF_FFFF, 0xFFFF_FFFF):
|
|
field = "File size"
|
|
self.file_size, = unpack('<Q', data[:8])
|
|
data = data[8:]
|
|
if self.compress_size == 0xFFFF_FFFF:
|
|
field = "Compress size"
|
|
self.compress_size, = unpack('<Q', data[:8])
|
|
data = data[8:]
|
|
if self.header_offset == 0xFFFF_FFFF:
|
|
field = "Header offset"
|
|
self.header_offset, = unpack('<Q', data[:8])
|
|
except struct.error:
|
|
raise BadDISCFile(f"Corrupt DISC64 extra field. "
|
|
f"{field} not found.") from None
|
|
elif tp == 0x7075:
|
|
data = extra[4:ln+4]
|
|
# Unicode Path Extra Field
|
|
try:
|
|
up_version, up_name_crc = unpack('<BL', data[:5])
|
|
if up_version == 1 and up_name_crc == filename_crc:
|
|
up_unicode_name = data[5:].decode('utf-8')
|
|
if up_unicode_name:
|
|
self.filename = _sanitize_filename(up_unicode_name)
|
|
else:
|
|
BadDISCFile("Empty unicode path extra field (0x7075)", stacklevel=2)
|
|
except struct.error as e:
|
|
raise BadDISCFile("Corrupt unicode path extra field (0x7075)") from e
|
|
except UnicodeDecodeError as e:
|
|
raise BadDISCFile('Corrupt unicode path extra field (0x7075): invalid utf-8 bytes') from e
|
|
|
|
extra = extra[ln+4:]
|
|
|
|
@classmethod
|
|
def from_file(cls, filename, arcname=None, *, strict_timestamps=True):
|
|
"""Construct an appropriate DISCInfo for a file on the filesystem.
|
|
|
|
filename should be the path to a file or directory on the filesystem.
|
|
|
|
arcname is the name which it will have within the archive (by default,
|
|
this will be the same as filename, but without a drive letter and with
|
|
leading path separators removed).
|
|
"""
|
|
if isinstance(filename, os.PathLike):
|
|
filename = os.fspath(filename)
|
|
st = os.stat(filename)
|
|
isdir = stat.S_ISDIR(st.st_mode)
|
|
mtime = time.localtime(st.st_mtime)
|
|
date_time = mtime[0:6]
|
|
if not strict_timestamps and date_time[0] < 1980:
|
|
date_time = (1980, 1, 1, 0, 0, 0)
|
|
elif not strict_timestamps and date_time[0] > 2107:
|
|
date_time = (2107, 12, 31, 23, 59, 59)
|
|
# Create DISCInfo instance to store file information
|
|
if arcname is None:
|
|
arcname = filename
|
|
arcname = os.path.normpath(os.path.splitdrive(arcname)[1])
|
|
while arcname[0] in (os.sep, os.altsep):
|
|
arcname = arcname[1:]
|
|
if isdir:
|
|
arcname += '/'
|
|
zinfo = cls(arcname, date_time)
|
|
zinfo.external_attr = (st.st_mode & 0xFFFF) << 16 # Unix attributes
|
|
if isdir:
|
|
zinfo.file_size = 0
|
|
zinfo.external_attr |= 0x10 # MS-DOS directory flag
|
|
else:
|
|
zinfo.file_size = st.st_size
|
|
|
|
return zinfo
|
|
|
|
def is_dir(self):
|
|
"""Return True if this archive member is a directory."""
|
|
return self.filename.endswith('/')
|
|
|
|
|
|
# DISC encryption uses the CRC32 one-byte primitive for scrambling some
|
|
# internal keys. We noticed that a direct implementation is faster than
|
|
# relying on binascii.crc32().
|
|
|
|
_crctable = None
|
|
def _gen_crc(crc):
|
|
for j in range(8):
|
|
if crc & 1:
|
|
crc = (crc >> 1) ^ 0xEDB88320
|
|
else:
|
|
crc >>= 1
|
|
return crc
|
|
|
|
# DISC supports a password-based form of encryption. Even though known
|
|
# plaintext attacks have been found against it, it is still useful
|
|
# to be able to get data out of such a file.
|
|
#
|
|
# Usage:
|
|
# zd = _DISCDecrypter(mypwd)
|
|
# plain_bytes = zd(cypher_bytes)
|
|
|
|
def _DISCDecrypter(pwd):
|
|
key0 = 305419896
|
|
key1 = 591751049
|
|
key2 = 878082192
|
|
|
|
global _crctable
|
|
if _crctable is None:
|
|
_crctable = list(map(_gen_crc, range(256)))
|
|
crctable = _crctable
|
|
|
|
def crc32(ch, crc):
|
|
"""Compute the CRC32 primitive on one byte."""
|
|
return (crc >> 8) ^ crctable[(crc ^ ch) & 0xFF]
|
|
|
|
def update_keys(c):
|
|
nonlocal key0, key1, key2
|
|
key0 = crc32(c, key0)
|
|
key1 = (key1 + (key0 & 0xFF)) & 0xFFFFFFFF
|
|
key1 = (key1 * 134775813 + 1) & 0xFFFFFFFF
|
|
key2 = crc32(key1 >> 24, key2)
|
|
|
|
for p in pwd:
|
|
update_keys(p)
|
|
|
|
def decrypter(data):
|
|
"""Decrypt a bytes object."""
|
|
result = bytearray()
|
|
append = result.append
|
|
for c in data:
|
|
k = key2 | 2
|
|
c ^= ((k * (k^1)) >> 8) & 0xFF
|
|
update_keys(c)
|
|
append(c)
|
|
return bytes(result)
|
|
|
|
return decrypter
|
|
|
|
|
|
class LZMACompressor:
|
|
|
|
def __init__(self):
|
|
self._comp = None
|
|
|
|
def _init(self):
|
|
props = lzma._encode_filter_properties({'id': lzma.FILTER_LZMA1})
|
|
self._comp = lzma.LZMACompressor(lzma.FORMAT_RAW, filters=[
|
|
lzma._decode_filter_properties(lzma.FILTER_LZMA1, props)
|
|
])
|
|
return struct.pack('<BBH', 9, 4, len(props)) + props
|
|
|
|
def compress(self, data):
|
|
if self._comp is None:
|
|
return self._init() + self._comp.compress(data)
|
|
return self._comp.compress(data)
|
|
|
|
def flush(self):
|
|
if self._comp is None:
|
|
return self._init() + self._comp.flush()
|
|
return self._comp.flush()
|
|
|
|
|
|
class LZMADecompressor:
|
|
|
|
def __init__(self):
|
|
self._decomp = None
|
|
self._unconsumed = b''
|
|
self.eof = False
|
|
|
|
def decompress(self, data):
|
|
if self._decomp is None:
|
|
self._unconsumed += data
|
|
if len(self._unconsumed) <= 4:
|
|
return b''
|
|
psize, = struct.unpack('<H', self._unconsumed[2:4])
|
|
if len(self._unconsumed) <= 4 + psize:
|
|
return b''
|
|
|
|
self._decomp = lzma.LZMADecompressor(lzma.FORMAT_RAW, filters=[
|
|
lzma._decode_filter_properties(lzma.FILTER_LZMA1,
|
|
self._unconsumed[4:4 + psize])
|
|
])
|
|
data = self._unconsumed[4 + psize:]
|
|
del self._unconsumed
|
|
|
|
result = self._decomp.decompress(data)
|
|
self.eof = self._decomp.eof
|
|
return result
|
|
|
|
|
|
compressor_names = {
|
|
0: 'store',
|
|
1: 'shrink',
|
|
2: 'reduce',
|
|
3: 'reduce',
|
|
4: 'reduce',
|
|
5: 'reduce',
|
|
6: 'implode',
|
|
7: 'tokenize',
|
|
8: 'deflate',
|
|
9: 'deflate64',
|
|
10: 'implode',
|
|
12: 'bDISC2',
|
|
14: 'lzma',
|
|
18: 'terse',
|
|
19: 'lz77',
|
|
97: 'wavpack',
|
|
98: 'ppmd',
|
|
}
|
|
|
|
def _check_compression(compression):
|
|
if compression == DISC_STORED:
|
|
pass
|
|
elif compression == DISC_DEFLATED:
|
|
if not zlib:
|
|
raise RuntimeError(
|
|
"Compression requires the (missing) zlib module")
|
|
elif compression == DISC_BDISC2:
|
|
if not bz2:
|
|
raise RuntimeError(
|
|
"Compression requires the (missing) bz2 module")
|
|
elif compression == DISC_LZMA:
|
|
if not lzma:
|
|
raise RuntimeError(
|
|
"Compression requires the (missing) lzma module")
|
|
else:
|
|
raise NotImplementedError("That compression method is not supported")
|
|
|
|
|
|
def _get_compressor(compress_type, compresslevel=None):
|
|
if compress_type == DISC_DEFLATED:
|
|
if compresslevel is not None:
|
|
return zlib.compressobj(compresslevel, zlib.DEFLATED, -15)
|
|
return zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -15)
|
|
elif compress_type == DISC_BDISC2:
|
|
if compresslevel is not None:
|
|
return bz2.BZ2Compressor(compresslevel)
|
|
return bz2.BZ2Compressor()
|
|
# compresslevel is ignored for DISC_LZMA
|
|
elif compress_type == DISC_LZMA:
|
|
return LZMACompressor()
|
|
else:
|
|
return None
|
|
|
|
|
|
def _get_decompressor(compress_type):
|
|
_check_compression(compress_type)
|
|
if compress_type == DISC_STORED:
|
|
return None
|
|
elif compress_type == DISC_DEFLATED:
|
|
return zlib.decompressobj(-15)
|
|
elif compress_type == DISC_BDISC2:
|
|
return bz2.BZ2Decompressor()
|
|
elif compress_type == DISC_LZMA:
|
|
return LZMADecompressor()
|
|
else:
|
|
descr = compressor_names.get(compress_type)
|
|
if descr:
|
|
raise NotImplementedError("compression type %d (%s)" % (compress_type, descr))
|
|
else:
|
|
raise NotImplementedError("compression type %d" % (compress_type,))
|
|
|
|
|
|
class _SharedFile:
|
|
def __init__(self, file, pos, close, lock, writing):
|
|
self._file = file
|
|
self._pos = pos
|
|
self._close = close
|
|
self._lock = lock
|
|
self._writing = writing
|
|
self.seekable = file.seekable
|
|
|
|
def tell(self):
|
|
return self._pos
|
|
|
|
def seek(self, offset, whence=0):
|
|
with self._lock:
|
|
if self._writing():
|
|
raise ValueError("Can't reposition in the DISC file while "
|
|
"there is an open writing handle on it. "
|
|
"Close the writing handle before trying to read.")
|
|
self._file.seek(offset, whence)
|
|
self._pos = self._file.tell()
|
|
return self._pos
|
|
|
|
def read(self, n=-1):
|
|
with self._lock:
|
|
if self._writing():
|
|
raise ValueError("Can't read from the DISC file while there "
|
|
"is an open writing handle on it. "
|
|
"Close the writing handle before trying to read.")
|
|
self._file.seek(self._pos)
|
|
data = self._file.read(n)
|
|
self._pos = self._file.tell()
|
|
return data
|
|
|
|
def close(self):
|
|
if self._file is not None:
|
|
fileobj = self._file
|
|
self._file = None
|
|
self._close(fileobj)
|
|
|
|
# Provide the tell method for unseekable stream
|
|
class _Tellable:
|
|
def __init__(self, fp):
|
|
self.fp = fp
|
|
self.offset = 0
|
|
|
|
def write(self, data):
|
|
n = self.fp.write(data)
|
|
self.offset += n
|
|
return n
|
|
|
|
def tell(self):
|
|
return self.offset
|
|
|
|
def flush(self):
|
|
self.fp.flush()
|
|
|
|
def close(self):
|
|
self.fp.close()
|
|
|
|
|
|
class DISCExtFile(io.BufferedIOBase):
|
|
"""File-like object for reading an archive member.
|
|
Is returned by DISCFile.open().
|
|
"""
|
|
|
|
# Max size supported by decompressor.
|
|
MAX_N = 1 << 31 - 1
|
|
|
|
# Read from compressed files in 4k blocks.
|
|
MIN_READ_SIZE = 4096
|
|
|
|
# Chunk size to read during seek
|
|
MAX_SEEK_READ = 1 << 24
|
|
|
|
def __init__(self, fileobj, mode, DISCinfo, pwd=None,
|
|
close_fileobj=False):
|
|
self._fileobj = fileobj
|
|
self._pwd = pwd
|
|
self._close_fileobj = close_fileobj
|
|
|
|
self._compress_type = DISCinfo.compress_type
|
|
self._compress_left = DISCinfo.compress_size
|
|
self._left = DISCinfo.file_size
|
|
|
|
self._decompressor = _get_decompressor(self._compress_type)
|
|
|
|
self._eof = False
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
|
|
self.newlines = None
|
|
|
|
self.mode = mode
|
|
self.name = DISCinfo.filename
|
|
|
|
if hasattr(DISCinfo, 'CRC'):
|
|
self._expected_crc = DISCinfo.CRC
|
|
self._running_crc = crc32(b'')
|
|
else:
|
|
self._expected_crc = None
|
|
|
|
self._seekable = False
|
|
try:
|
|
if fileobj.seekable():
|
|
self._orig_compress_start = fileobj.tell()
|
|
self._orig_compress_size = DISCinfo.compress_size
|
|
self._orig_file_size = DISCinfo.file_size
|
|
self._orig_start_crc = self._running_crc
|
|
self._orig_crc = self._expected_crc
|
|
self._seekable = True
|
|
except AttributeError:
|
|
pass
|
|
|
|
self._decrypter = None
|
|
if pwd:
|
|
if DISCinfo.flag_bits & _MASK_USE_DATA_DESCRIPTOR:
|
|
# compare against the file type from extended local headers
|
|
check_byte = (DISCinfo._raw_time >> 8) & 0xff
|
|
else:
|
|
# compare against the CRC otherwise
|
|
check_byte = (DISCinfo.CRC >> 24) & 0xff
|
|
h = self._init_decrypter()
|
|
if h != check_byte:
|
|
raise RuntimeError("Bad password for file %r" % DISCinfo.orig_filename)
|
|
|
|
|
|
def _init_decrypter(self):
|
|
self._decrypter = _DISCDecrypter(self._pwd)
|
|
# The first 12 bytes in the cypher stream is an encryption header
|
|
# used to strengthen the algorithm. The first 11 bytes are
|
|
# completely random, while the 12th contains the MSB of the CRC,
|
|
# or the MSB of the file time depending on the header type
|
|
# and is used to check the correctness of the password.
|
|
header = self._fileobj.read(12)
|
|
self._compress_left -= 12
|
|
return self._decrypter(header)[11]
|
|
|
|
def __repr__(self):
|
|
result = ['<%s.%s' % (self.__class__.__module__,
|
|
self.__class__.__qualname__)]
|
|
if not self.closed:
|
|
result.append(' name=%r mode=%r' % (self.name, self.mode))
|
|
if self._compress_type != DISC_STORED:
|
|
result.append(' compress_type=%s' %
|
|
compressor_names.get(self._compress_type,
|
|
self._compress_type))
|
|
else:
|
|
result.append(' [closed]')
|
|
result.append('>')
|
|
return ''.join(result)
|
|
|
|
def readline(self, limit=-1):
|
|
"""Read and return a line from the stream.
|
|
|
|
If limit is specified, at most limit bytes will be read.
|
|
"""
|
|
|
|
if limit < 0:
|
|
# Shortcut common case - newline found in buffer.
|
|
i = self._readbuffer.find(b'\n', self._offset) + 1
|
|
if i > 0:
|
|
line = self._readbuffer[self._offset: i]
|
|
self._offset = i
|
|
return line
|
|
|
|
return io.BufferedIOBase.readline(self, limit)
|
|
|
|
def peek(self, n=1):
|
|
"""Returns buffered bytes without advancing the position."""
|
|
if n > len(self._readbuffer) - self._offset:
|
|
chunk = self.read(n)
|
|
if len(chunk) > self._offset:
|
|
self._readbuffer = chunk + self._readbuffer[self._offset:]
|
|
self._offset = 0
|
|
else:
|
|
self._offset -= len(chunk)
|
|
|
|
# Return up to 512 bytes to reduce allocation overhead for tight loops.
|
|
return self._readbuffer[self._offset: self._offset + 512]
|
|
|
|
def readable(self):
|
|
if self.closed:
|
|
raise ValueError("I/O operation on closed file.")
|
|
return True
|
|
|
|
def read(self, n=-1):
|
|
"""Read and return up to n bytes.
|
|
If the argument is omitted, None, or negative, data is read and returned until EOF is reached.
|
|
"""
|
|
if self.closed:
|
|
raise ValueError("read from closed file.")
|
|
if n is None or n < 0:
|
|
buf = self._readbuffer[self._offset:]
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
while not self._eof:
|
|
buf += self._read1(self.MAX_N)
|
|
return buf
|
|
|
|
end = n + self._offset
|
|
if end < len(self._readbuffer):
|
|
buf = self._readbuffer[self._offset:end]
|
|
self._offset = end
|
|
return buf
|
|
|
|
n = end - len(self._readbuffer)
|
|
buf = self._readbuffer[self._offset:]
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
while n > 0 and not self._eof:
|
|
data = self._read1(n)
|
|
if n < len(data):
|
|
self._readbuffer = data
|
|
self._offset = n
|
|
buf += data[:n]
|
|
break
|
|
buf += data
|
|
n -= len(data)
|
|
return buf
|
|
|
|
def _update_crc(self, newdata):
|
|
# Update the CRC using the given data.
|
|
if self._expected_crc is None:
|
|
# No need to compute the CRC if we don't have a reference value
|
|
return
|
|
self._running_crc = crc32(newdata, self._running_crc)
|
|
# Check the CRC if we're at the end of the file
|
|
if self._eof and self._running_crc != self._expected_crc:
|
|
raise BadDISCFile("Bad CRC-32 for file %r" % self.name)
|
|
|
|
def read1(self, n):
|
|
"""Read up to n bytes with at most one read() system call."""
|
|
|
|
if n is None or n < 0:
|
|
buf = self._readbuffer[self._offset:]
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
while not self._eof:
|
|
data = self._read1(self.MAX_N)
|
|
if data:
|
|
buf += data
|
|
break
|
|
return buf
|
|
|
|
end = n + self._offset
|
|
if end < len(self._readbuffer):
|
|
buf = self._readbuffer[self._offset:end]
|
|
self._offset = end
|
|
return buf
|
|
|
|
n = end - len(self._readbuffer)
|
|
buf = self._readbuffer[self._offset:]
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
if n > 0:
|
|
while not self._eof:
|
|
data = self._read1(n)
|
|
if n < len(data):
|
|
self._readbuffer = data
|
|
self._offset = n
|
|
buf += data[:n]
|
|
break
|
|
if data:
|
|
buf += data
|
|
break
|
|
return buf
|
|
|
|
def _read1(self, n):
|
|
# Read up to n compressed bytes with at most one read() system call,
|
|
# decrypt and decompress them.
|
|
if self._eof or n <= 0:
|
|
return b''
|
|
|
|
# Read from file.
|
|
if self._compress_type == DISC_DEFLATED:
|
|
## Handle unconsumed data.
|
|
data = self._decompressor.unconsumed_tail
|
|
if n > len(data):
|
|
data += self._read2(n - len(data))
|
|
else:
|
|
data = self._read2(n)
|
|
|
|
if self._compress_type == DISC_STORED:
|
|
self._eof = self._compress_left <= 0
|
|
elif self._compress_type == DISC_DEFLATED:
|
|
n = max(n, self.MIN_READ_SIZE)
|
|
data = self._decompressor.decompress(data, n)
|
|
self._eof = (self._decompressor.eof or
|
|
self._compress_left <= 0 and
|
|
not self._decompressor.unconsumed_tail)
|
|
if self._eof:
|
|
data += self._decompressor.flush()
|
|
else:
|
|
data = self._decompressor.decompress(data)
|
|
self._eof = self._decompressor.eof or self._compress_left <= 0
|
|
|
|
data = data[:self._left]
|
|
self._left -= len(data)
|
|
if self._left <= 0:
|
|
self._eof = True
|
|
self._update_crc(data)
|
|
return data
|
|
|
|
def _read2(self, n):
|
|
if self._compress_left <= 0:
|
|
return b''
|
|
|
|
n = max(n, self.MIN_READ_SIZE)
|
|
n = min(n, self._compress_left)
|
|
|
|
data = self._fileobj.read(n)
|
|
self._compress_left -= len(data)
|
|
if not data:
|
|
raise EOFError
|
|
|
|
if self._decrypter is not None:
|
|
data = self._decrypter(data)
|
|
return data
|
|
|
|
def close(self):
|
|
try:
|
|
if self._close_fileobj:
|
|
self._fileobj.close()
|
|
finally:
|
|
super().close()
|
|
|
|
def seekable(self):
|
|
if self.closed:
|
|
raise ValueError("I/O operation on closed file.")
|
|
return self._seekable
|
|
|
|
def seek(self, offset, whence=os.SEEK_SET):
|
|
if self.closed:
|
|
raise ValueError("seek on closed file.")
|
|
if not self._seekable:
|
|
raise io.UnsupportedOperation("underlying stream is not seekable")
|
|
curr_pos = self.tell()
|
|
if whence == os.SEEK_SET:
|
|
new_pos = offset
|
|
elif whence == os.SEEK_CUR:
|
|
new_pos = curr_pos + offset
|
|
elif whence == os.SEEK_END:
|
|
new_pos = self._orig_file_size + offset
|
|
else:
|
|
raise ValueError("whence must be os.SEEK_SET (0), "
|
|
"os.SEEK_CUR (1), or os.SEEK_END (2)")
|
|
|
|
if new_pos > self._orig_file_size:
|
|
new_pos = self._orig_file_size
|
|
|
|
if new_pos < 0:
|
|
new_pos = 0
|
|
|
|
read_offset = new_pos - curr_pos
|
|
buff_offset = read_offset + self._offset
|
|
|
|
# Fast seek uncompressed unencrypted file
|
|
if self._compress_type == DISC_STORED and self._decrypter is None and read_offset > 0:
|
|
# disable CRC checking after first seeking - it would be invalid
|
|
self._expected_crc = None
|
|
# seek actual file taking already buffered data into account
|
|
read_offset -= len(self._readbuffer) - self._offset
|
|
self._fileobj.seek(read_offset, os.SEEK_CUR)
|
|
self._left -= read_offset
|
|
read_offset = 0
|
|
# flush read buffer
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
elif buff_offset >= 0 and buff_offset < len(self._readbuffer):
|
|
# Just move the _offset index if the new position is in the _readbuffer
|
|
self._offset = buff_offset
|
|
read_offset = 0
|
|
elif read_offset < 0:
|
|
# Position is before the current position. Reset the DISCExtFile
|
|
self._fileobj.seek(self._orig_compress_start)
|
|
self._running_crc = self._orig_start_crc
|
|
self._expected_crc = self._orig_crc
|
|
self._compress_left = self._orig_compress_size
|
|
self._left = self._orig_file_size
|
|
self._readbuffer = b''
|
|
self._offset = 0
|
|
self._decompressor = _get_decompressor(self._compress_type)
|
|
self._eof = False
|
|
read_offset = new_pos
|
|
if self._decrypter is not None:
|
|
self._init_decrypter()
|
|
|
|
while read_offset > 0:
|
|
read_len = min(self.MAX_SEEK_READ, read_offset)
|
|
self.read(read_len)
|
|
read_offset -= read_len
|
|
|
|
return self.tell()
|
|
|
|
def tell(self):
|
|
if self.closed:
|
|
raise ValueError("tell on closed file.")
|
|
if not self._seekable:
|
|
raise io.UnsupportedOperation("underlying stream is not seekable")
|
|
filepos = self._orig_file_size - self._left - len(self._readbuffer) + self._offset
|
|
return filepos
|
|
|
|
|
|
class _DISCWriteFile(io.BufferedIOBase):
|
|
def __init__(self, zf, zinfo, DISC64):
|
|
self._zinfo = zinfo
|
|
self._DISC64 = DISC64
|
|
self._DISCfile = zf
|
|
self._compressor = _get_compressor(zinfo.compress_type,
|
|
zinfo._compresslevel)
|
|
self._file_size = 0
|
|
self._compress_size = 0
|
|
self._crc = 0
|
|
|
|
@property
|
|
def _fileobj(self):
|
|
return self._DISCfile.fp
|
|
|
|
def writable(self):
|
|
return True
|
|
|
|
def write(self, data):
|
|
if self.closed:
|
|
raise ValueError('I/O operation on closed file.')
|
|
|
|
# Accept any data that supports the buffer protocol
|
|
if isinstance(data, (bytes, bytearray)):
|
|
nbytes = len(data)
|
|
else:
|
|
data = memoryview(data)
|
|
nbytes = data.nbytes
|
|
self._file_size += nbytes
|
|
|
|
self._crc = crc32(data, self._crc)
|
|
if self._compressor:
|
|
data = self._compressor.compress(data)
|
|
self._compress_size += len(data)
|
|
self._fileobj.write(data)
|
|
return nbytes
|
|
|
|
def close(self):
|
|
if self.closed:
|
|
return
|
|
try:
|
|
super().close()
|
|
# Flush any data from the compressor, and update header info
|
|
if self._compressor:
|
|
buf = self._compressor.flush()
|
|
self._compress_size += len(buf)
|
|
self._fileobj.write(buf)
|
|
self._zinfo.compress_size = self._compress_size
|
|
else:
|
|
self._zinfo.compress_size = self._file_size
|
|
self._zinfo.CRC = self._crc
|
|
self._zinfo.file_size = self._file_size
|
|
|
|
if not self._DISC64:
|
|
if self._file_size > DISC64_LIMIT:
|
|
raise RuntimeError("File size too large, try using force_DISC64")
|
|
if self._compress_size > DISC64_LIMIT:
|
|
raise RuntimeError("Compressed size too large, try using force_DISC64")
|
|
|
|
# Write updated header info
|
|
if self._zinfo.flag_bits & _MASK_USE_DATA_DESCRIPTOR:
|
|
# Write CRC and file sizes after the file data
|
|
fmt = '<LLQQ' if self._DISC64 else '<LLLL'
|
|
self._fileobj.write(struct.pack(fmt, _DD_SIGNATURE, self._zinfo.CRC,
|
|
self._zinfo.compress_size, self._zinfo.file_size))
|
|
self._DISCfile.start_dir = self._fileobj.tell()
|
|
else:
|
|
# Seek backwards and write file header (which will now include
|
|
# correct CRC and file sizes)
|
|
|
|
# Preserve current position in file
|
|
self._DISCfile.start_dir = self._fileobj.tell()
|
|
self._fileobj.seek(self._zinfo.header_offset)
|
|
self._fileobj.write(self._zinfo.FileHeader(self._DISC64))
|
|
self._fileobj.seek(self._DISCfile.start_dir)
|
|
|
|
# Successfully written: Add file to our caches
|
|
self._DISCfile.filelist.append(self._zinfo)
|
|
self._DISCfile.NameToInfo[self._zinfo.filename] = self._zinfo
|
|
finally:
|
|
self._DISCfile._writing = False
|
|
|
|
|
|
|
|
class DISCFile:
|
|
""" Class with methods to open, read, write, close, list DISC files.
|
|
|
|
z = DISCFile(file, mode="r", compression=DISC_STORED, allowDISC64=True,
|
|
compresslevel=None)
|
|
|
|
file: Either the path to the file, or a file-like object.
|
|
If it is a path, the file will be opened and closed by DISCFile.
|
|
mode: The mode can be either read 'r', write 'w', exclusive create 'x',
|
|
or append 'a'.
|
|
compression: DISC_STORED (no compression), DISC_DEFLATED (requires zlib),
|
|
DISC_BDISC2 (requires bz2) or DISC_LZMA (requires lzma).
|
|
allowDISC64: if True DISCFile will create files with DISC64 extensions when
|
|
needed, otherwise it will raise an exception when this would
|
|
be necessary.
|
|
compresslevel: None (default for the given compression type) or an integer
|
|
specifying the level to pass to the compressor.
|
|
When using DISC_STORED or DISC_LZMA this keyword has no effect.
|
|
When using DISC_DEFLATED integers 0 through 9 are accepted.
|
|
When using DISC_BDISC2 integers 1 through 9 are accepted.
|
|
|
|
"""
|
|
|
|
fp = None # Set here since __del__ checks it
|
|
_windows_illegal_name_trans_table = None
|
|
|
|
def __init__(self, file, mode="r", compression=DISC_STORED, allowDISC64=True,
|
|
compresslevel=None, *, strict_timestamps=True, metadata_encoding=None):
|
|
"""Open the DISC file with mode read 'r', write 'w', exclusive create 'x',
|
|
or append 'a'."""
|
|
if mode not in ('r', 'w', 'x', 'a'):
|
|
raise ValueError("DISCFile requires mode 'r', 'w', 'x', or 'a'")
|
|
|
|
_check_compression(compression)
|
|
|
|
self._allowDISC64 = allowDISC64
|
|
self._didModify = False
|
|
self.debug = 0 # Level of printing: 0 through 3
|
|
self.NameToInfo = {} # Find file info given name
|
|
self.filelist = [] # List of DISCInfo instances for archive
|
|
self.compression = compression # Method of compression
|
|
self.compresslevel = compresslevel
|
|
self.mode = mode
|
|
self.pwd = None
|
|
self._comment = b''
|
|
self._strict_timestamps = strict_timestamps
|
|
self.metadata_encoding = metadata_encoding
|
|
|
|
# Check that we don't try to write with nonconforming codecs
|
|
if self.metadata_encoding and mode != 'r':
|
|
raise ValueError(
|
|
"metadata_encoding is only supported for reading files")
|
|
|
|
# Check if we were passed a file-like object
|
|
if isinstance(file, os.PathLike):
|
|
file = os.fspath(file)
|
|
if isinstance(file, str):
|
|
# No, it's a filename
|
|
self._filePassed = 0
|
|
self.filename = file
|
|
modeDict = {'r' : 'rb', 'w': 'w+b', 'x': 'x+b', 'a' : 'r+b',
|
|
'r+b': 'w+b', 'w+b': 'wb', 'x+b': 'xb'}
|
|
filemode = modeDict[mode]
|
|
while True:
|
|
try:
|
|
self.fp = io.open(file, filemode)
|
|
except OSError:
|
|
if filemode in modeDict:
|
|
filemode = modeDict[filemode]
|
|
continue
|
|
raise
|
|
break
|
|
else:
|
|
self._filePassed = 1
|
|
self.fp = file
|
|
self.filename = getattr(file, 'name', None)
|
|
self._fileRefCnt = 1
|
|
self._lock = threading.RLock()
|
|
self._seekable = True
|
|
self._writing = False
|
|
|
|
try:
|
|
if mode == 'r':
|
|
self._RealGetContents()
|
|
elif mode in ('w', 'x'):
|
|
# set the modified flag so central directory gets written
|
|
# even if no files are added to the archive
|
|
self._didModify = True
|
|
try:
|
|
self.start_dir = self.fp.tell()
|
|
except (AttributeError, OSError):
|
|
self.fp = _Tellable(self.fp)
|
|
self.start_dir = 0
|
|
self._seekable = False
|
|
else:
|
|
# Some file-like objects can provide tell() but not seek()
|
|
try:
|
|
self.fp.seek(self.start_dir)
|
|
except (AttributeError, OSError):
|
|
self._seekable = False
|
|
elif mode == 'a':
|
|
try:
|
|
# See if file is a DISC file
|
|
self._RealGetContents()
|
|
# seek to start of directory and overwrite
|
|
self.fp.seek(self.start_dir)
|
|
except BadDISCFile:
|
|
# file is not a DISC file, just append
|
|
self.fp.seek(0, 2)
|
|
|
|
# set the modified flag so central directory gets written
|
|
# even if no files are added to the archive
|
|
self._didModify = True
|
|
self.start_dir = self.fp.tell()
|
|
else:
|
|
raise ValueError("Mode must be 'r', 'w', 'x', or 'a'")
|
|
except:
|
|
fp = self.fp
|
|
self.fp = None
|
|
self._fpclose(fp)
|
|
raise
|
|
|
|
def __enter__(self):
|
|
return self
|
|
|
|
def __exit__(self, type, value, traceback):
|
|
self.close()
|
|
|
|
def __repr__(self):
|
|
result = ['<%s.%s' % (self.__class__.__module__,
|
|
self.__class__.__qualname__)]
|
|
if self.fp is not None:
|
|
if self._filePassed:
|
|
result.append(' file=%r' % self.fp)
|
|
elif self.filename is not None:
|
|
result.append(' filename=%r' % self.filename)
|
|
result.append(' mode=%r' % self.mode)
|
|
else:
|
|
result.append(' [closed]')
|
|
result.append('>')
|
|
return ''.join(result)
|
|
|
|
def _RealGetContents(self):
|
|
"""Read in the table of contents for the DISC file."""
|
|
fp = self.fp
|
|
try:
|
|
endrec = _EndRecData(fp)
|
|
except OSError:
|
|
raise BadDISCFile("File is not a DISC file")
|
|
if not endrec:
|
|
raise BadDISCFile("File is not a DISC file")
|
|
if self.debug > 1:
|
|
print(endrec)
|
|
size_cd = endrec[_ECD_SIZE] # bytes in central directory
|
|
offset_cd = endrec[_ECD_OFFSET] # offset of central directory
|
|
self._comment = endrec[_ECD_COMMENT] # archive comment
|
|
|
|
# "concat" is zero, unless DISC was concatenated to another file
|
|
concat = endrec[_ECD_LOCATION] - size_cd - offset_cd
|
|
if endrec[_ECD_SIGNATURE] == stringEndArchive64:
|
|
# If DISC64 extension structures are present, account for them
|
|
concat -= (sizeEndCentDir64 + sizeEndCentDir64Locator)
|
|
|
|
if self.debug > 2:
|
|
inferred = concat + offset_cd
|
|
print("given, inferred, offset", offset_cd, inferred, concat)
|
|
# self.start_dir: Position of start of central directory
|
|
self.start_dir = offset_cd + concat
|
|
if self.start_dir < 0:
|
|
raise BadDISCFile("Bad offset for central directory")
|
|
fp.seek(self.start_dir, 0)
|
|
data = fp.read(size_cd)
|
|
fp = io.BytesIO(data)
|
|
total = 0
|
|
while total < size_cd:
|
|
centdir = fp.read(sizeCentralDir)
|
|
if len(centdir) != sizeCentralDir:
|
|
raise BadDISCFile("Truncated central directory")
|
|
centdir = struct.unpack(structCentralDir, centdir)
|
|
if centdir[_CD_SIGNATURE] != stringCentralDir:
|
|
raise BadDISCFile("Bad magic number for central directory")
|
|
if self.debug > 2:
|
|
print(centdir)
|
|
filename = fp.read(centdir[_CD_FILENAME_LENGTH])
|
|
orig_filename_crc = crc32(filename)
|
|
flags = centdir[_CD_FLAG_BITS]
|
|
if flags & _MASK_UTF_FILENAME:
|
|
# UTF-8 file names extension
|
|
filename = filename.decode('utf-8')
|
|
else:
|
|
# Historical DISC filename encoding
|
|
filename = filename.decode(self.metadata_encoding or 'cp437')
|
|
# Create DISCInfo instance to store file information
|
|
x = DISCInfo(filename)
|
|
x.extra = fp.read(centdir[_CD_EXTRA_FIELD_LENGTH])
|
|
x.comment = fp.read(centdir[_CD_COMMENT_LENGTH])
|
|
x.header_offset = centdir[_CD_LOCAL_HEADER_OFFSET]
|
|
(x.create_version, x.create_system, x.extract_version, x.reserved,
|
|
x.flag_bits, x.compress_type, t, d,
|
|
x.CRC, x.compress_size, x.file_size) = centdir[1:12]
|
|
if x.extract_version > MAX_EXTRACT_VERSION:
|
|
raise NotImplementedError("DISC file version %.1f" %
|
|
(x.extract_version / 10))
|
|
x.volume, x.internal_attr, x.external_attr = centdir[15:18]
|
|
# Convert date/time code to (year, month, day, hour, min, sec)
|
|
x._raw_time = t
|
|
x.date_time = ( (d>>9)+1980, (d>>5)&0xF, d&0x1F,
|
|
t>>11, (t>>5)&0x3F, (t&0x1F) * 2 )
|
|
x._decodeExtra(orig_filename_crc)
|
|
x.header_offset = x.header_offset + concat
|
|
self.filelist.append(x)
|
|
self.NameToInfo[x.filename] = x
|
|
|
|
# update total bytes read from central directory
|
|
total = (total + sizeCentralDir + centdir[_CD_FILENAME_LENGTH]
|
|
+ centdir[_CD_EXTRA_FIELD_LENGTH]
|
|
+ centdir[_CD_COMMENT_LENGTH])
|
|
|
|
if self.debug > 2:
|
|
print("total", total)
|
|
|
|
|
|
def namelist(self):
|
|
"""Return a list of file names in the archive."""
|
|
return [data.filename for data in self.filelist]
|
|
|
|
def infolist(self):
|
|
"""Return a list of class DISCInfo instances for files in the
|
|
archive."""
|
|
return self.filelist
|
|
|
|
def printdir(self, file=None):
|
|
"""Print a table of contents for the DISC file."""
|
|
print("%-46s %19s %12s" % ("File Name", "Modified ", "Size"),
|
|
file=file)
|
|
for zinfo in self.filelist:
|
|
date = "%d-%02d-%02d %02d:%02d:%02d" % zinfo.date_time[:6]
|
|
print("%-46s %s %12d" % (zinfo.filename, date, zinfo.file_size),
|
|
file=file)
|
|
|
|
def testDISC(self):
|
|
"""Read all the files and check the CRC.
|
|
|
|
Return None if all files could be read successfully, or the name
|
|
of the offending file otherwise."""
|
|
chunk_size = 2 ** 20
|
|
for zinfo in self.filelist:
|
|
try:
|
|
# Read by chunks, to avoid an OverflowError or a
|
|
# MemoryError with very large embedded files.
|
|
with self.open(zinfo.filename, "r") as f:
|
|
while f.read(chunk_size): # Check CRC-32
|
|
pass
|
|
except BadDISCFile:
|
|
return zinfo.filename
|
|
|
|
def getinfo(self, name):
|
|
"""Return the instance of DISCInfo given 'name'."""
|
|
info = self.NameToInfo.get(name)
|
|
if info is None:
|
|
raise KeyError(
|
|
'There is no item named %r in the archive' % name)
|
|
|
|
return info
|
|
|
|
def setpassword(self, pwd):
|
|
"""Set default password for encrypted files."""
|
|
if pwd and not isinstance(pwd, bytes):
|
|
raise TypeError("pwd: expected bytes, got %s" % type(pwd).__name__)
|
|
if pwd:
|
|
self.pwd = pwd
|
|
else:
|
|
self.pwd = None
|
|
|
|
@property
|
|
def comment(self):
|
|
"""The comment text associated with the DISC file."""
|
|
return self._comment
|
|
|
|
@comment.setter
|
|
def comment(self, comment):
|
|
if not isinstance(comment, bytes):
|
|
raise TypeError("comment: expected bytes, got %s" % type(comment).__name__)
|
|
# check for valid comment length
|
|
if len(comment) > DISC_MAX_COMMENT:
|
|
import warnings
|
|
warnings.warn('Archive comment is too long; truncating to %d bytes'
|
|
% DISC_MAX_COMMENT, stacklevel=2)
|
|
comment = comment[:DISC_MAX_COMMENT]
|
|
self._comment = comment
|
|
self._didModify = True
|
|
|
|
def read(self, name, pwd=None):
|
|
"""Return file bytes for name."""
|
|
with self.open(name, "r", pwd) as fp:
|
|
return fp.read()
|
|
|
|
def open(self, name, mode="r", pwd=None, *, force_DISC64=False):
|
|
"""Return file-like object for 'name'.
|
|
|
|
name is a string for the file name within the DISC file, or a DISCInfo
|
|
object.
|
|
|
|
mode should be 'r' to read a file already in the DISC file, or 'w' to
|
|
write to a file newly added to the archive.
|
|
|
|
pwd is the password to decrypt files (only used for reading).
|
|
|
|
When writing, if the file size is not known in advance but may exceed
|
|
2 GiB, pass force_DISC64 to use the DISC64 format, which can handle large
|
|
files. If the size is known in advance, it is best to pass a DISCInfo
|
|
instance for name, with zinfo.file_size set.
|
|
"""
|
|
if mode not in {"r", "w"}:
|
|
raise ValueError('open() requires mode "r" or "w"')
|
|
if pwd and (mode == "w"):
|
|
raise ValueError("pwd is only supported for reading files")
|
|
if not self.fp:
|
|
raise ValueError(
|
|
"Attempt to use DISC archive that was already closed")
|
|
|
|
# Make sure we have an info object
|
|
if isinstance(name, DISCInfo):
|
|
# 'name' is already an info object
|
|
zinfo = name
|
|
elif mode == 'w':
|
|
zinfo = DISCInfo(name)
|
|
zinfo.compress_type = self.compression
|
|
zinfo._compresslevel = self.compresslevel
|
|
else:
|
|
# Get info object for name
|
|
zinfo = self.getinfo(name)
|
|
|
|
if mode == 'w':
|
|
return self._open_to_write(zinfo, force_DISC64=force_DISC64)
|
|
|
|
if self._writing:
|
|
raise ValueError("Can't read from the DISC file while there "
|
|
"is an open writing handle on it. "
|
|
"Close the writing handle before trying to read.")
|
|
|
|
# Open for reading:
|
|
self._fileRefCnt += 1
|
|
zef_file = _SharedFile(self.fp, zinfo.header_offset,
|
|
self._fpclose, self._lock, lambda: self._writing)
|
|
try:
|
|
# Skip the file header:
|
|
fheader = zef_file.read(sizeFileHeader)
|
|
if len(fheader) != sizeFileHeader:
|
|
raise BadDISCFile("Truncated file header")
|
|
fheader = struct.unpack(structFileHeader, fheader)
|
|
if fheader[_FH_SIGNATURE] != stringFileHeader:
|
|
raise BadDISCFile("Bad magic number for file header")
|
|
|
|
fname = zef_file.read(fheader[_FH_FILENAME_LENGTH])
|
|
if fheader[_FH_EXTRA_FIELD_LENGTH]:
|
|
zef_file.seek(fheader[_FH_EXTRA_FIELD_LENGTH], whence=1)
|
|
|
|
if zinfo.flag_bits & _MASK_COMPRESSED_PATCH:
|
|
# DISC 2.7: compressed patched data
|
|
raise NotImplementedError("compressed patched data (flag bit 5)")
|
|
|
|
if zinfo.flag_bits & _MASK_STRONG_ENCRYPTION:
|
|
# strong encryption
|
|
raise NotImplementedError("strong encryption (flag bit 6)")
|
|
|
|
if fheader[_FH_GENERAL_PURPOSE_FLAG_BITS] & _MASK_UTF_FILENAME:
|
|
# UTF-8 filename
|
|
fname_str = fname.decode("utf-8")
|
|
else:
|
|
fname_str = fname.decode(self.metadata_encoding or "cp437")
|
|
|
|
if fname_str != zinfo.orig_filename:
|
|
raise BadDISCFile(
|
|
'File name in directory %r and header %r differ.'
|
|
% (zinfo.orig_filename, fname))
|
|
|
|
# check for encrypted flag & handle password
|
|
is_encrypted = zinfo.flag_bits & _MASK_ENCRYPTED
|
|
if is_encrypted:
|
|
if not pwd:
|
|
pwd = self.pwd
|
|
if pwd and not isinstance(pwd, bytes):
|
|
raise TypeError("pwd: expected bytes, got %s" % type(pwd).__name__)
|
|
if not pwd:
|
|
raise RuntimeError("File %r is encrypted, password "
|
|
"required for extraction" % name)
|
|
else:
|
|
pwd = None
|
|
|
|
return DISCExtFile(zef_file, mode, zinfo, pwd, True)
|
|
except:
|
|
zef_file.close()
|
|
raise
|
|
|
|
def _open_to_write(self, zinfo, force_DISC64=False):
|
|
if force_DISC64 and not self._allowDISC64:
|
|
raise ValueError(
|
|
"force_DISC64 is True, but allowDISC64 was False when opening "
|
|
"the DISC file."
|
|
)
|
|
if self._writing:
|
|
raise ValueError("Can't write to the DISC file while there is "
|
|
"another write handle open on it. "
|
|
"Close the first handle before opening another.")
|
|
|
|
# Size and CRC are overwritten with correct data after processing the file
|
|
zinfo.compress_size = 0
|
|
zinfo.CRC = 0
|
|
|
|
zinfo.flag_bits = 0x00
|
|
if zinfo.compress_type == DISC_LZMA:
|
|
# Compressed data includes an end-of-stream (EOS) marker
|
|
zinfo.flag_bits |= _MASK_COMPRESS_OPTION_1
|
|
if not self._seekable:
|
|
zinfo.flag_bits |= _MASK_USE_DATA_DESCRIPTOR
|
|
|
|
if not zinfo.external_attr:
|
|
zinfo.external_attr = 0o600 << 16 # permissions: ?rw-------
|
|
|
|
# Compressed size can be larger than uncompressed size
|
|
DISC64 = force_DISC64 or (zinfo.file_size * 1.05 > DISC64_LIMIT)
|
|
if not self._allowDISC64 and DISC64:
|
|
raise LargeDISCFile("Filesize would require DISC64 extensions")
|
|
|
|
if self._seekable:
|
|
self.fp.seek(self.start_dir)
|
|
zinfo.header_offset = self.fp.tell()
|
|
|
|
self._writecheck(zinfo)
|
|
self._didModify = True
|
|
|
|
self.fp.write(zinfo.FileHeader(DISC64))
|
|
|
|
self._writing = True
|
|
return _DISCWriteFile(self, zinfo, DISC64)
|
|
|
|
def extract(self, member, path=None, pwd=None):
|
|
"""Extract a member from the archive to the current working directory,
|
|
using its full name. Its file information is extracted as accurately
|
|
as possible. `member' may be a filename or a DISCInfo object. You can
|
|
specify a different directory using `path'.
|
|
"""
|
|
if path is None:
|
|
path = os.getcwd()
|
|
else:
|
|
path = os.fspath(path)
|
|
|
|
return self._extract_member(member, path, pwd)
|
|
|
|
def extractall(self, path=None, members=None, pwd=None):
|
|
"""Extract all members from the archive to the current working
|
|
directory. `path' specifies a different directory to extract to.
|
|
`members' is optional and must be a subset of the list returned
|
|
by namelist().
|
|
"""
|
|
if members is None:
|
|
members = self.namelist()
|
|
|
|
if path is None:
|
|
path = os.getcwd()
|
|
else:
|
|
path = os.fspath(path)
|
|
|
|
for DISCinfo in members:
|
|
self._extract_member(DISCinfo, path, pwd)
|
|
|
|
@classmethod
|
|
def _sanitize_windows_name(cls, arcname, pathsep):
|
|
"""Replace bad characters and remove trailing dots from parts."""
|
|
table = cls._windows_illegal_name_trans_table
|
|
if not table:
|
|
illegal = ':<>|"?*'
|
|
table = str.maketrans(illegal, '_' * len(illegal))
|
|
cls._windows_illegal_name_trans_table = table
|
|
arcname = arcname.translate(table)
|
|
# remove trailing dots and spaces
|
|
arcname = (x.rstrip(' .') for x in arcname.split(pathsep))
|
|
# rejoin, removing empty parts.
|
|
arcname = pathsep.join(x for x in arcname if x)
|
|
return arcname
|
|
|
|
def _extract_member(self, member, targetpath, pwd):
|
|
"""Extract the DISCInfo object 'member' to a physical
|
|
file on the path targetpath.
|
|
"""
|
|
if not isinstance(member, DISCInfo):
|
|
member = self.getinfo(member)
|
|
|
|
# build the destination pathname, replacing
|
|
# forward slashes to platform specific separators.
|
|
arcname = member.filename.replace('/', os.path.sep)
|
|
|
|
if os.path.altsep:
|
|
arcname = arcname.replace(os.path.altsep, os.path.sep)
|
|
# interpret absolute pathname as relative, remove drive letter or
|
|
# UNC path, redundant separators, "." and ".." components.
|
|
arcname = os.path.splitdrive(arcname)[1]
|
|
invalid_path_parts = ('', os.path.curdir, os.path.pardir)
|
|
arcname = os.path.sep.join(x for x in arcname.split(os.path.sep)
|
|
if x not in invalid_path_parts)
|
|
if os.path.sep == '\\':
|
|
# filter illegal characters on Windows
|
|
arcname = self._sanitize_windows_name(arcname, os.path.sep)
|
|
|
|
if not arcname:
|
|
raise ValueError("Empty filename.")
|
|
|
|
targetpath = os.path.join(targetpath, arcname)
|
|
targetpath = os.path.normpath(targetpath)
|
|
|
|
# Create all upper directories if necessary.
|
|
upperdirs = os.path.dirname(targetpath)
|
|
if upperdirs and not os.path.exists(upperdirs):
|
|
os.makedirs(upperdirs)
|
|
|
|
if member.is_dir():
|
|
if not os.path.isdir(targetpath):
|
|
os.mkdir(targetpath)
|
|
return targetpath
|
|
|
|
with self.open(member, pwd=pwd) as source, \
|
|
open(targetpath, "wb") as target:
|
|
shutil.copyfileobj(source, target)
|
|
|
|
return targetpath
|
|
|
|
def _writecheck(self, zinfo):
|
|
"""Check for errors before writing a file to the archive."""
|
|
if zinfo.filename in self.NameToInfo:
|
|
import warnings
|
|
warnings.warn('Duplicate name: %r' % zinfo.filename, stacklevel=3)
|
|
if self.mode not in ('w', 'x', 'a'):
|
|
raise ValueError("write() requires mode 'w', 'x', or 'a'")
|
|
if not self.fp:
|
|
raise ValueError(
|
|
"Attempt to write DISC archive that was already closed")
|
|
_check_compression(zinfo.compress_type)
|
|
if not self._allowDISC64:
|
|
requires_DISC64 = None
|
|
if len(self.filelist) >= DISC_FILECOUNT_LIMIT:
|
|
requires_DISC64 = "Files count"
|
|
elif zinfo.file_size > DISC64_LIMIT:
|
|
requires_DISC64 = "Filesize"
|
|
elif zinfo.header_offset > DISC64_LIMIT:
|
|
requires_DISC64 = "DISCfile size"
|
|
if requires_DISC64:
|
|
raise LargeDISCFile(requires_DISC64 +
|
|
" would require DISC64 extensions")
|
|
|
|
def write(self, filename, arcname=None,
|
|
compress_type=None, compresslevel=None):
|
|
"""Put the bytes from filename into the archive under the name
|
|
arcname."""
|
|
if not self.fp:
|
|
raise ValueError(
|
|
"Attempt to write to DISC archive that was already closed")
|
|
if self._writing:
|
|
raise ValueError(
|
|
"Can't write to DISC archive while an open writing handle exists"
|
|
)
|
|
|
|
zinfo = DISCInfo.from_file(filename, arcname,
|
|
strict_timestamps=self._strict_timestamps)
|
|
|
|
if zinfo.is_dir():
|
|
zinfo.compress_size = 0
|
|
zinfo.CRC = 0
|
|
self.mkdir(zinfo)
|
|
else:
|
|
if compress_type is not None:
|
|
zinfo.compress_type = compress_type
|
|
else:
|
|
zinfo.compress_type = self.compression
|
|
|
|
if compresslevel is not None:
|
|
zinfo._compresslevel = compresslevel
|
|
else:
|
|
zinfo._compresslevel = self.compresslevel
|
|
|
|
with open(filename, "rb") as src, self.open(zinfo, 'w') as dest:
|
|
shutil.copyfileobj(src, dest, 1024*8)
|
|
|
|
def writestr(self, zinfo_or_arcname, data,
|
|
compress_type=None, compresslevel=None):
|
|
"""Write a file into the archive. The contents is 'data', which
|
|
may be either a 'str' or a 'bytes' instance; if it is a 'str',
|
|
it is encoded as UTF-8 first.
|
|
'zinfo_or_arcname' is either a DISCInfo instance or
|
|
the name of the file in the archive."""
|
|
if isinstance(data, str):
|
|
data = data.encode("utf-8")
|
|
if not isinstance(zinfo_or_arcname, DISCInfo):
|
|
zinfo = DISCInfo(filename=zinfo_or_arcname,
|
|
date_time=time.localtime(time.time())[:6])
|
|
zinfo.compress_type = self.compression
|
|
zinfo._compresslevel = self.compresslevel
|
|
if zinfo.filename.endswith('/'):
|
|
zinfo.external_attr = 0o40775 << 16 # drwxrwxr-x
|
|
zinfo.external_attr |= 0x10 # MS-DOS directory flag
|
|
else:
|
|
zinfo.external_attr = 0o600 << 16 # ?rw-------
|
|
else:
|
|
zinfo = zinfo_or_arcname
|
|
|
|
if not self.fp:
|
|
raise ValueError(
|
|
"Attempt to write to DISC archive that was already closed")
|
|
if self._writing:
|
|
raise ValueError(
|
|
"Can't write to DISC archive while an open writing handle exists."
|
|
)
|
|
|
|
if compress_type is not None:
|
|
zinfo.compress_type = compress_type
|
|
|
|
if compresslevel is not None:
|
|
zinfo._compresslevel = compresslevel
|
|
|
|
zinfo.file_size = len(data) # Uncompressed size
|
|
with self._lock:
|
|
with self.open(zinfo, mode='w') as dest:
|
|
dest.write(data)
|
|
|
|
def mkdir(self, zinfo_or_directory_name, mode=511):
|
|
"""Creates a directory inside the DISC archive."""
|
|
if isinstance(zinfo_or_directory_name, DISCInfo):
|
|
zinfo = zinfo_or_directory_name
|
|
if not zinfo.is_dir():
|
|
raise ValueError("The given DISCInfo does not describe a directory")
|
|
elif isinstance(zinfo_or_directory_name, str):
|
|
directory_name = zinfo_or_directory_name
|
|
if not directory_name.endswith("/"):
|
|
directory_name += "/"
|
|
zinfo = DISCInfo(directory_name)
|
|
zinfo.compress_size = 0
|
|
zinfo.CRC = 0
|
|
zinfo.external_attr = ((0o40000 | mode) & 0xFFFF) << 16
|
|
zinfo.file_size = 0
|
|
zinfo.external_attr |= 0x10
|
|
else:
|
|
raise TypeError("Expected type str or DISCInfo")
|
|
|
|
with self._lock:
|
|
if self._seekable:
|
|
self.fp.seek(self.start_dir)
|
|
zinfo.header_offset = self.fp.tell() # Start of header bytes
|
|
if zinfo.compress_type == DISC_LZMA:
|
|
# Compressed data includes an end-of-stream (EOS) marker
|
|
zinfo.flag_bits |= _MASK_COMPRESS_OPTION_1
|
|
|
|
self._writecheck(zinfo)
|
|
self._didModify = True
|
|
|
|
self.filelist.append(zinfo)
|
|
self.NameToInfo[zinfo.filename] = zinfo
|
|
self.fp.write(zinfo.FileHeader(False))
|
|
self.start_dir = self.fp.tell()
|
|
|
|
def __del__(self):
|
|
"""Call the "close()" method in case the user forgot."""
|
|
self.close()
|
|
|
|
def close(self):
|
|
"""Close the file, and for mode 'w', 'x' and 'a' write the ending
|
|
records."""
|
|
if self.fp is None:
|
|
return
|
|
|
|
if self._writing:
|
|
raise ValueError("Can't close the DISC file while there is "
|
|
"an open writing handle on it. "
|
|
"Close the writing handle before closing the DISC.")
|
|
|
|
try:
|
|
if self.mode in ('w', 'x', 'a') and self._didModify: # write ending records
|
|
with self._lock:
|
|
if self._seekable:
|
|
self.fp.seek(self.start_dir)
|
|
self._write_end_record()
|
|
finally:
|
|
fp = self.fp
|
|
self.fp = None
|
|
self._fpclose(fp)
|
|
|
|
def _write_end_record(self):
|
|
for zinfo in self.filelist: # write central directory
|
|
dt = zinfo.date_time
|
|
dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
|
|
dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
|
|
extra = []
|
|
if zinfo.file_size > DISC64_LIMIT \
|
|
or zinfo.compress_size > DISC64_LIMIT:
|
|
extra.append(zinfo.file_size)
|
|
extra.append(zinfo.compress_size)
|
|
file_size = 0xffffffff
|
|
compress_size = 0xffffffff
|
|
else:
|
|
file_size = zinfo.file_size
|
|
compress_size = zinfo.compress_size
|
|
|
|
if zinfo.header_offset > DISC64_LIMIT:
|
|
extra.append(zinfo.header_offset)
|
|
header_offset = 0xffffffff
|
|
else:
|
|
header_offset = zinfo.header_offset
|
|
|
|
extra_data = zinfo.extra
|
|
min_version = 0
|
|
if extra:
|
|
# Append a DISC64 field to the extra's
|
|
extra_data = _strip_extra(extra_data, (1,))
|
|
extra_data = struct.pack(
|
|
'<HH' + 'Q'*len(extra),
|
|
1, 8*len(extra), *extra) + extra_data
|
|
|
|
min_version = DISC64_VERSION
|
|
|
|
if zinfo.compress_type == DISC_BDISC2:
|
|
min_version = max(BDISC2_VERSION, min_version)
|
|
elif zinfo.compress_type == DISC_LZMA:
|
|
min_version = max(LZMA_VERSION, min_version)
|
|
|
|
extract_version = max(min_version, zinfo.extract_version)
|
|
create_version = max(min_version, zinfo.create_version)
|
|
filename, flag_bits = zinfo._encodeFilenameFlags()
|
|
centdir = struct.pack(structCentralDir,
|
|
stringCentralDir, create_version,
|
|
zinfo.create_system, extract_version, zinfo.reserved,
|
|
flag_bits, zinfo.compress_type, dostime, dosdate,
|
|
zinfo.CRC, compress_size, file_size,
|
|
len(filename), len(extra_data), len(zinfo.comment),
|
|
0, zinfo.internal_attr, zinfo.external_attr,
|
|
header_offset)
|
|
self.fp.write(centdir)
|
|
self.fp.write(filename)
|
|
self.fp.write(extra_data)
|
|
self.fp.write(zinfo.comment)
|
|
|
|
pos2 = self.fp.tell()
|
|
# Write end-of-DISC-archive record
|
|
centDirCount = len(self.filelist)
|
|
centDirSize = pos2 - self.start_dir
|
|
centDirOffset = self.start_dir
|
|
requires_DISC64 = None
|
|
if centDirCount > DISC_FILECOUNT_LIMIT:
|
|
requires_DISC64 = "Files count"
|
|
elif centDirOffset > DISC64_LIMIT:
|
|
requires_DISC64 = "Central directory offset"
|
|
elif centDirSize > DISC64_LIMIT:
|
|
requires_DISC64 = "Central directory size"
|
|
if requires_DISC64:
|
|
# Need to write the DISC64 end-of-archive records
|
|
if not self._allowDISC64:
|
|
raise LargeDISCFile(requires_DISC64 +
|
|
" would require DISC64 extensions")
|
|
DISC64endrec = struct.pack(
|
|
structEndArchive64, stringEndArchive64,
|
|
44, 45, 45, 0, 0, centDirCount, centDirCount,
|
|
centDirSize, centDirOffset)
|
|
self.fp.write(DISC64endrec)
|
|
|
|
DISC64locrec = struct.pack(
|
|
structEndArchive64Locator,
|
|
stringEndArchive64Locator, 0, pos2, 1)
|
|
self.fp.write(DISC64locrec)
|
|
centDirCount = min(centDirCount, 0xFFFF)
|
|
centDirSize = min(centDirSize, 0xFFFFFFFF)
|
|
centDirOffset = min(centDirOffset, 0xFFFFFFFF)
|
|
|
|
endrec = struct.pack(structEndArchive, stringEndArchive,
|
|
0, 0, centDirCount, centDirCount,
|
|
centDirSize, centDirOffset, len(self._comment))
|
|
self.fp.write(endrec)
|
|
self.fp.write(self._comment)
|
|
if self.mode == "a":
|
|
self.fp.truncate()
|
|
self.fp.flush()
|
|
|
|
def _fpclose(self, fp):
|
|
assert self._fileRefCnt > 0
|
|
self._fileRefCnt -= 1
|
|
if not self._fileRefCnt and not self._filePassed:
|
|
fp.close()
|
|
|
|
|
|
class PyDISCFile(DISCFile):
|
|
"""Class to create DISC archives with Python library files and packages."""
|
|
|
|
def __init__(self, file, mode="r", compression=DISC_STORED,
|
|
allowDISC64=True, optimize=-1):
|
|
DISCFile.__init__(self, file, mode=mode, compression=compression,
|
|
allowDISC64=allowDISC64)
|
|
self._optimize = optimize
|
|
|
|
def writepy(self, pathname, basename="", filterfunc=None):
|
|
"""Add all files from "pathname" to the DISC archive.
|
|
|
|
If pathname is a package directory, search the directory and
|
|
all package subdirectories recursively for all *.py and enter
|
|
the modules into the archive. If pathname is a plain
|
|
directory, listdir *.py and enter all modules. Else, pathname
|
|
must be a Python *.py file and the module will be put into the
|
|
archive. Added modules are always module.pyc.
|
|
This method will compile the module.py into module.pyc if
|
|
necessary.
|
|
If filterfunc(pathname) is given, it is called with every argument.
|
|
When it is False, the file or directory is skipped.
|
|
"""
|
|
pathname = os.fspath(pathname)
|
|
if filterfunc and not filterfunc(pathname):
|
|
if self.debug:
|
|
label = 'path' if os.path.isdir(pathname) else 'file'
|
|
print('%s %r skipped by filterfunc' % (label, pathname))
|
|
return
|
|
dir, name = os.path.split(pathname)
|
|
if os.path.isdir(pathname):
|
|
initname = os.path.join(pathname, "__init__.py")
|
|
if os.path.isfile(initname):
|
|
# This is a package directory, add it
|
|
if basename:
|
|
basename = "%s/%s" % (basename, name)
|
|
else:
|
|
basename = name
|
|
if self.debug:
|
|
print("Adding package in", pathname, "as", basename)
|
|
fname, arcname = self._get_codename(initname[0:-3], basename)
|
|
if self.debug:
|
|
print("Adding", arcname)
|
|
self.write(fname, arcname)
|
|
dirlist = sorted(os.listdir(pathname))
|
|
dirlist.remove("__init__.py")
|
|
# Add all *.py files and package subdirectories
|
|
for filename in dirlist:
|
|
path = os.path.join(pathname, filename)
|
|
root, ext = os.path.splitext(filename)
|
|
if os.path.isdir(path):
|
|
if os.path.isfile(os.path.join(path, "__init__.py")):
|
|
# This is a package directory, add it
|
|
self.writepy(path, basename,
|
|
filterfunc=filterfunc) # Recursive call
|
|
elif ext == ".py":
|
|
if filterfunc and not filterfunc(path):
|
|
if self.debug:
|
|
print('file %r skipped by filterfunc' % path)
|
|
continue
|
|
fname, arcname = self._get_codename(path[0:-3],
|
|
basename)
|
|
if self.debug:
|
|
print("Adding", arcname)
|
|
self.write(fname, arcname)
|
|
else:
|
|
# This is NOT a package directory, add its files at top level
|
|
if self.debug:
|
|
print("Adding files from directory", pathname)
|
|
for filename in sorted(os.listdir(pathname)):
|
|
path = os.path.join(pathname, filename)
|
|
root, ext = os.path.splitext(filename)
|
|
if ext == ".py":
|
|
if filterfunc and not filterfunc(path):
|
|
if self.debug:
|
|
print('file %r skipped by filterfunc' % path)
|
|
continue
|
|
fname, arcname = self._get_codename(path[0:-3],
|
|
basename)
|
|
if self.debug:
|
|
print("Adding", arcname)
|
|
self.write(fname, arcname)
|
|
else:
|
|
if pathname[-3:] != ".py":
|
|
raise RuntimeError(
|
|
'Files added with writepy() must end with ".py"')
|
|
fname, arcname = self._get_codename(pathname[0:-3], basename)
|
|
if self.debug:
|
|
print("Adding file", arcname)
|
|
self.write(fname, arcname)
|
|
|
|
def _get_codename(self, pathname, basename):
|
|
"""Return (filename, archivename) for the path.
|
|
|
|
Given a module name path, return the correct file path and
|
|
archive name, compiling if necessary. For example, given
|
|
/python/lib/string, return (/python/lib/string.pyc, string).
|
|
"""
|
|
def _compile(file, optimize=-1):
|
|
import py_compile
|
|
if self.debug:
|
|
print("Compiling", file)
|
|
try:
|
|
py_compile.compile(file, doraise=True, optimize=optimize)
|
|
except py_compile.PyCompileError as err:
|
|
print(err.msg)
|
|
return False
|
|
return True
|
|
|
|
file_py = pathname + ".py"
|
|
file_pyc = pathname + ".pyc"
|
|
pycache_opt0 = importlib.util.cache_from_source(file_py, optimization='')
|
|
pycache_opt1 = importlib.util.cache_from_source(file_py, optimization=1)
|
|
pycache_opt2 = importlib.util.cache_from_source(file_py, optimization=2)
|
|
if self._optimize == -1:
|
|
# legacy mode: use whatever file is present
|
|
if (os.path.isfile(file_pyc) and
|
|
os.stat(file_pyc).st_mtime >= os.stat(file_py).st_mtime):
|
|
# Use .pyc file.
|
|
arcname = fname = file_pyc
|
|
elif (os.path.isfile(pycache_opt0) and
|
|
os.stat(pycache_opt0).st_mtime >= os.stat(file_py).st_mtime):
|
|
# Use the __pycache__/*.pyc file, but write it to the legacy pyc
|
|
# file name in the archive.
|
|
fname = pycache_opt0
|
|
arcname = file_pyc
|
|
elif (os.path.isfile(pycache_opt1) and
|
|
os.stat(pycache_opt1).st_mtime >= os.stat(file_py).st_mtime):
|
|
# Use the __pycache__/*.pyc file, but write it to the legacy pyc
|
|
# file name in the archive.
|
|
fname = pycache_opt1
|
|
arcname = file_pyc
|
|
elif (os.path.isfile(pycache_opt2) and
|
|
os.stat(pycache_opt2).st_mtime >= os.stat(file_py).st_mtime):
|
|
# Use the __pycache__/*.pyc file, but write it to the legacy pyc
|
|
# file name in the archive.
|
|
fname = pycache_opt2
|
|
arcname = file_pyc
|
|
else:
|
|
# Compile py into PEP 3147 pyc file.
|
|
if _compile(file_py):
|
|
if sys.flags.optimize == 0:
|
|
fname = pycache_opt0
|
|
elif sys.flags.optimize == 1:
|
|
fname = pycache_opt1
|
|
else:
|
|
fname = pycache_opt2
|
|
arcname = file_pyc
|
|
else:
|
|
fname = arcname = file_py
|
|
else:
|
|
# new mode: use given optimization level
|
|
if self._optimize == 0:
|
|
fname = pycache_opt0
|
|
arcname = file_pyc
|
|
else:
|
|
arcname = file_pyc
|
|
if self._optimize == 1:
|
|
fname = pycache_opt1
|
|
elif self._optimize == 2:
|
|
fname = pycache_opt2
|
|
else:
|
|
msg = "invalid value for 'optimize': {!r}".format(self._optimize)
|
|
raise ValueError(msg)
|
|
if not (os.path.isfile(fname) and
|
|
os.stat(fname).st_mtime >= os.stat(file_py).st_mtime):
|
|
if not _compile(file_py, optimize=self._optimize):
|
|
fname = arcname = file_py
|
|
archivename = os.path.split(arcname)[1]
|
|
if basename:
|
|
archivename = "%s/%s" % (basename, archivename)
|
|
return (fname, archivename)
|
|
|