428 lines
17 KiB
Python
428 lines
17 KiB
Python
"""
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Zip splitter.
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Status: can read most important headers
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Authors: Christophe Gisquet and Victor Stinner
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"""
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from lib.hachoir_parser import Parser
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from lib.hachoir_core.field import (FieldSet, ParserError,
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Bit, Bits, Enum,
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TimeDateMSDOS32, SubFile,
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UInt8, UInt16, UInt32, UInt64,
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String, PascalString16,
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RawBytes)
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from lib.hachoir_core.text_handler import textHandler, filesizeHandler, hexadecimal
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from lib.hachoir_core.error import HACHOIR_ERRORS
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from lib.hachoir_core.tools import makeUnicode
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from lib.hachoir_core.endian import LITTLE_ENDIAN
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from lib.hachoir_parser.common.deflate import Deflate
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MAX_FILESIZE = 1000 * 1024 * 1024
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COMPRESSION_DEFLATE = 8
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COMPRESSION_METHOD = {
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0: u"no compression",
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1: u"Shrunk",
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2: u"Reduced (factor 1)",
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3: u"Reduced (factor 2)",
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4: u"Reduced (factor 3)",
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5: u"Reduced (factor 4)",
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6: u"Imploded",
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7: u"Tokenizing",
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8: u"Deflate",
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9: u"Deflate64",
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10: u"PKWARE Imploding",
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11: u"Reserved by PKWARE",
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12: u"File is compressed using BZIP2 algorithm",
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13: u"Reserved by PKWARE",
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14: u"LZMA (EFS)",
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15: u"Reserved by PKWARE",
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16: u"Reserved by PKWARE",
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17: u"Reserved by PKWARE",
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18: u"File is compressed using IBM TERSE (new)",
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19: u"IBM LZ77 z Architecture (PFS)",
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98: u"PPMd version I, Rev 1",
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}
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def ZipRevision(field):
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return "%u.%u" % divmod(field.value, 10)
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class ZipVersion(FieldSet):
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static_size = 16
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HOST_OS = {
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0: u"FAT file system (DOS, OS/2, NT)",
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1: u"Amiga",
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2: u"VMS (VAX or Alpha AXP)",
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3: u"Unix",
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4: u"VM/CMS",
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5: u"Atari",
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6: u"HPFS file system (OS/2, NT 3.x)",
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7: u"Macintosh",
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8: u"Z-System",
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9: u"CP/M",
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10: u"TOPS-20",
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11: u"NTFS file system (NT)",
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12: u"SMS/QDOS",
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13: u"Acorn RISC OS",
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14: u"VFAT file system (Win95, NT)",
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15: u"MVS",
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16: u"BeOS (BeBox or PowerMac)",
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17: u"Tandem",
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}
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def createFields(self):
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yield textHandler(UInt8(self, "zip_version", "ZIP version"), ZipRevision)
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yield Enum(UInt8(self, "host_os", "ZIP Host OS"), self.HOST_OS)
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class ZipGeneralFlags(FieldSet):
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static_size = 16
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def createFields(self):
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# Need the compression info from the parent, and that is the byte following
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method = self.stream.readBits(self.absolute_address+16, 16, LITTLE_ENDIAN)
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yield Bits(self, "unused[]", 2, "Unused")
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yield Bit(self, "encrypted_central_dir", "Selected data values in the Local Header are masked")
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yield Bit(self, "incomplete", "Reserved by PKWARE for enhanced compression.")
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yield Bit(self, "uses_unicode", "Filename and comments are in UTF-8")
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yield Bits(self, "unused[]", 4, "Unused")
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yield Bit(self, "strong_encrypt", "Strong encryption (version >= 50)")
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yield Bit(self, "is_patched", "File is compressed with patched data?")
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yield Bit(self, "enhanced_deflate", "Reserved for use with method 8")
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yield Bit(self, "has_descriptor",
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"Compressed data followed by descriptor?")
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if method == 6:
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yield Bit(self, "use_8k_sliding", "Use 8K sliding dictionary (instead of 4K)")
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yield Bit(self, "use_3shannon", "Use a 3 Shannon-Fano tree (instead of 2 Shannon-Fano)")
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elif method in (8, 9):
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NAME = {
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0: "Normal compression",
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1: "Maximum compression",
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2: "Fast compression",
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3: "Super Fast compression"
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}
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yield Enum(Bits(self, "method", 2), NAME)
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elif method == 14: #LZMA
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yield Bit(self, "lzma_eos", "LZMA stream is ended with a EndOfStream marker")
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yield Bit(self, "unused[]")
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else:
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yield Bits(self, "compression_info", 2)
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yield Bit(self, "is_encrypted", "File is encrypted?")
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class ExtraField(FieldSet):
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EXTRA_FIELD_ID = {
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0x0007: "AV Info",
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0x0009: "OS/2 extended attributes (also Info-ZIP)",
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0x000a: "PKWARE Win95/WinNT FileTimes", # undocumented!
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0x000c: "PKWARE VAX/VMS (also Info-ZIP)",
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0x000d: "PKWARE Unix",
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0x000f: "Patch Descriptor",
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0x07c8: "Info-ZIP Macintosh (old, J. Lee)",
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0x2605: "ZipIt Macintosh (first version)",
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0x2705: "ZipIt Macintosh v 1.3.5 and newer (w/o full filename)",
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0x334d: "Info-ZIP Macintosh (new, D. Haase Mac3 field)",
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0x4341: "Acorn/SparkFS (David Pilling)",
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0x4453: "Windows NT security descriptor (binary ACL)",
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0x4704: "VM/CMS",
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0x470f: "MVS",
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0x4b46: "FWKCS MD5 (third party, see below)",
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0x4c41: "OS/2 access control list (text ACL)",
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0x4d49: "Info-ZIP VMS (VAX or Alpha)",
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0x5356: "AOS/VS (binary ACL)",
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0x5455: "extended timestamp",
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0x5855: "Info-ZIP Unix (original; also OS/2, NT, etc.)",
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0x6542: "BeOS (BeBox, PowerMac, etc.)",
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0x756e: "ASi Unix",
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0x7855: "Info-ZIP Unix (new)",
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0xfb4a: "SMS/QDOS",
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}
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def createFields(self):
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yield Enum(UInt16(self, "field_id", "Extra field ID"),
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self.EXTRA_FIELD_ID)
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size = UInt16(self, "field_data_size", "Extra field data size")
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yield size
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if size.value > 0:
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yield RawBytes(self, "field_data", size, "Unknown field data")
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def ZipStartCommonFields(self):
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yield ZipVersion(self, "version_needed", "Version needed")
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yield ZipGeneralFlags(self, "flags", "General purpose flag")
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yield Enum(UInt16(self, "compression", "Compression method"),
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COMPRESSION_METHOD)
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yield TimeDateMSDOS32(self, "last_mod", "Last modification file time")
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yield textHandler(UInt32(self, "crc32", "CRC-32"), hexadecimal)
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yield UInt32(self, "compressed_size", "Compressed size")
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yield UInt32(self, "uncompressed_size", "Uncompressed size")
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yield UInt16(self, "filename_length", "Filename length")
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yield UInt16(self, "extra_length", "Extra fields length")
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def zipGetCharset(self):
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if self["flags/uses_unicode"].value:
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return "UTF-8"
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else:
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return "ISO-8859-15"
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class ZipCentralDirectory(FieldSet):
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HEADER = 0x02014b50
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def createFields(self):
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yield ZipVersion(self, "version_made_by", "Version made by")
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for field in ZipStartCommonFields(self):
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yield field
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# Check unicode status
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charset = zipGetCharset(self)
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yield UInt16(self, "comment_length", "Comment length")
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yield UInt16(self, "disk_number_start", "Disk number start")
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yield UInt16(self, "internal_attr", "Internal file attributes")
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yield UInt32(self, "external_attr", "External file attributes")
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yield UInt32(self, "offset_header", "Relative offset of local header")
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yield String(self, "filename", self["filename_length"].value,
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"Filename", charset=charset)
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if 0 < self["extra_length"].value:
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yield RawBytes(self, "extra", self["extra_length"].value,
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"Extra fields")
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if 0 < self["comment_length"].value:
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yield String(self, "comment", self["comment_length"].value,
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"Comment", charset=charset)
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def createDescription(self):
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return "Central directory: %s" % self["filename"].display
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class Zip64EndCentralDirectory(FieldSet):
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HEADER = 0x06064b50
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def createFields(self):
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yield UInt64(self, "zip64_end_size",
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"Size of zip64 end of central directory record")
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yield ZipVersion(self, "version_made_by", "Version made by")
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yield ZipVersion(self, "version_needed", "Version needed to extract")
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yield UInt32(self, "number_disk", "Number of this disk")
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yield UInt32(self, "number_disk2",
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"Number of the disk with the start of the central directory")
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yield UInt64(self, "number_entries",
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"Total number of entries in the central directory on this disk")
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yield UInt64(self, "number_entries2",
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"Total number of entries in the central directory")
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yield UInt64(self, "size", "Size of the central directory")
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yield UInt64(self, "offset", "Offset of start of central directory")
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if 0 < self["zip64_end_size"].value:
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yield RawBytes(self, "data_sector", self["zip64_end_size"].value,
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"zip64 extensible data sector")
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class ZipEndCentralDirectory(FieldSet):
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HEADER = 0x06054b50
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def createFields(self):
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yield UInt16(self, "number_disk", "Number of this disk")
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yield UInt16(self, "number_disk2", "Number in the central dir")
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yield UInt16(self, "total_number_disk",
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"Total number of entries in this disk")
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yield UInt16(self, "total_number_disk2",
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"Total number of entries in the central dir")
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yield UInt32(self, "size", "Size of the central directory")
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yield UInt32(self, "offset", "Offset of start of central directory")
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yield PascalString16(self, "comment", "ZIP comment")
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class ZipDataDescriptor(FieldSet):
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HEADER_STRING = "\x50\x4B\x07\x08"
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HEADER = 0x08074B50
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static_size = 96
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def createFields(self):
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yield textHandler(UInt32(self, "file_crc32",
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"Checksum (CRC32)"), hexadecimal)
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yield filesizeHandler(UInt32(self, "file_compressed_size",
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"Compressed size (bytes)"))
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yield filesizeHandler(UInt32(self, "file_uncompressed_size",
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"Uncompressed size (bytes)"))
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class FileEntry(FieldSet):
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HEADER = 0x04034B50
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filename = None
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def data(self, size):
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compression = self["compression"].value
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if compression == 0:
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return SubFile(self, "data", size, filename=self.filename)
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compressed = SubFile(self, "compressed_data", size, filename=self.filename)
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if compression == COMPRESSION_DEFLATE:
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return Deflate(compressed)
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else:
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return compressed
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def resync(self):
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# Non-seekable output, search the next data descriptor
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size = self.stream.searchBytesLength(ZipDataDescriptor.HEADER_STRING, False,
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self.absolute_address+self.current_size)
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if size <= 0:
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raise ParserError("Couldn't resync to %s" %
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ZipDataDescriptor.HEADER_STRING)
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yield self.data(size)
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yield textHandler(UInt32(self, "header[]", "Header"), hexadecimal)
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data_desc = ZipDataDescriptor(self, "data_desc", "Data descriptor")
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#self.info("Resynced!")
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yield data_desc
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# The above could be checked anytime, but we prefer trying parsing
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# than aborting
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if self["crc32"].value == 0 and \
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data_desc["file_compressed_size"].value != size:
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raise ParserError("Bad resync: position=>%i but data_desc=>%i" %
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(size, data_desc["file_compressed_size"].value))
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def createFields(self):
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for field in ZipStartCommonFields(self):
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yield field
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length = self["filename_length"].value
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if length:
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filename = String(self, "filename", length, "Filename",
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charset=zipGetCharset(self))
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yield filename
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self.filename = filename.value
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if self["extra_length"].value:
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yield RawBytes(self, "extra", self["extra_length"].value, "Extra")
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size = self["compressed_size"].value
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if size > 0:
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yield self.data(size)
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elif self["flags/incomplete"].value:
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for field in self.resync():
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yield field
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if self["flags/has_descriptor"].value:
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yield ZipDataDescriptor(self, "data_desc", "Data descriptor")
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def createDescription(self):
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return "File entry: %s (%s)" % \
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(self["filename"].value, self["compressed_size"].display)
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def validate(self):
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if self["compression"].value not in COMPRESSION_METHOD:
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return "Unknown compression method (%u)" % self["compression"].value
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return ""
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class ZipSignature(FieldSet):
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HEADER = 0x05054B50
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def createFields(self):
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yield PascalString16(self, "signature", "Signature")
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class Zip64EndCentralDirectoryLocator(FieldSet):
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HEADER = 0x07064b50
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def createFields(self):
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yield UInt32(self, "disk_number", \
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"Number of the disk with the start of the zip64 end of central directory")
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yield UInt64(self, "relative_offset", \
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"Relative offset of the zip64 end of central directory record")
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yield UInt32(self, "disk_total_number", "Total number of disks")
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class ZipFile(Parser):
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endian = LITTLE_ENDIAN
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MIME_TYPES = {
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# Default ZIP archive
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u"application/zip": "zip",
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u"application/x-zip": "zip",
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# Java archive (JAR)
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u"application/x-jar": "jar",
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u"application/java-archive": "jar",
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# OpenOffice 1.0
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u"application/vnd.sun.xml.calc": "sxc",
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u"application/vnd.sun.xml.draw": "sxd",
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u"application/vnd.sun.xml.impress": "sxi",
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u"application/vnd.sun.xml.writer": "sxw",
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u"application/vnd.sun.xml.math": "sxm",
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# OpenOffice 1.0 (template)
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u"application/vnd.sun.xml.calc.template": "stc",
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u"application/vnd.sun.xml.draw.template": "std",
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u"application/vnd.sun.xml.impress.template": "sti",
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u"application/vnd.sun.xml.writer.template": "stw",
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u"application/vnd.sun.xml.writer.global": "sxg",
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# OpenDocument
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u"application/vnd.oasis.opendocument.chart": "odc",
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u"application/vnd.oasis.opendocument.image": "odi",
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u"application/vnd.oasis.opendocument.database": "odb",
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u"application/vnd.oasis.opendocument.formula": "odf",
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u"application/vnd.oasis.opendocument.graphics": "odg",
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u"application/vnd.oasis.opendocument.presentation": "odp",
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u"application/vnd.oasis.opendocument.spreadsheet": "ods",
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u"application/vnd.oasis.opendocument.text": "odt",
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u"application/vnd.oasis.opendocument.text-master": "odm",
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# OpenDocument (template)
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u"application/vnd.oasis.opendocument.graphics-template": "otg",
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u"application/vnd.oasis.opendocument.presentation-template": "otp",
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u"application/vnd.oasis.opendocument.spreadsheet-template": "ots",
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u"application/vnd.oasis.opendocument.text-template": "ott",
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}
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PARSER_TAGS = {
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"id": "zip",
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"category": "archive",
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"file_ext": tuple(MIME_TYPES.itervalues()),
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"mime": tuple(MIME_TYPES.iterkeys()),
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"magic": (("PK\3\4", 0),),
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"subfile": "skip",
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"min_size": (4 + 26)*8, # header + file entry
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"description": "ZIP archive"
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}
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def validate(self):
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if self["header[0]"].value != FileEntry.HEADER:
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return "Invalid magic"
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try:
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file0 = self["file[0]"]
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except HACHOIR_ERRORS, err:
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return "Unable to get file #0"
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err = file0.validate()
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if err:
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return "File #0: %s" % err
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return True
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def createFields(self):
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# File data
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self.signature = None
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self.central_directory = []
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while not self.eof:
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header = textHandler(UInt32(self, "header[]", "Header"), hexadecimal)
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yield header
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header = header.value
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if header == FileEntry.HEADER:
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yield FileEntry(self, "file[]")
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elif header == ZipDataDescriptor.HEADER:
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yield ZipDataDescriptor(self, "spanning[]")
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elif header == 0x30304b50:
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yield ZipDataDescriptor(self, "temporary_spanning[]")
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elif header == ZipCentralDirectory.HEADER:
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yield ZipCentralDirectory(self, "central_directory[]")
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elif header == ZipEndCentralDirectory.HEADER:
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yield ZipEndCentralDirectory(self, "end_central_directory", "End of central directory")
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elif header == Zip64EndCentralDirectory.HEADER:
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yield Zip64EndCentralDirectory(self, "end64_central_directory", "ZIP64 end of central directory")
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elif header == ZipSignature.HEADER:
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yield ZipSignature(self, "signature", "Signature")
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elif header == Zip64EndCentralDirectoryLocator.HEADER:
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yield Zip64EndCentralDirectoryLocator(self, "end_locator", "ZIP64 Enf of central directory locator")
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else:
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raise ParserError("Error, unknown ZIP header (0x%08X)." % header)
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def createMimeType(self):
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if self["file[0]/filename"].value == "mimetype":
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return makeUnicode(self["file[0]/data"].value)
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else:
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return u"application/zip"
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def createFilenameSuffix(self):
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if self["file[0]/filename"].value == "mimetype":
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mime = self["file[0]/compressed_data"].value
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if mime in self.MIME_TYPES:
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return "." + self.MIME_TYPES[mime]
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return ".zip"
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def createContentSize(self):
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start = 0
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end = MAX_FILESIZE * 8
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end = self.stream.searchBytes("PK\5\6", start, end)
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if end is not None:
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return end + 22*8
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return None
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