forked from KolibriOS/kolibrios
1609 lines
73 KiB
Plaintext
1609 lines
73 KiB
Plaintext
The following are the known types of zipfile extra fields as of this
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writing. Extra fields are documented in PKWARE's appnote.txt and are
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intended to allow for backward- and forward-compatible extensions to
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the zipfile format. Multiple extra-field types may be chained together,
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provided that the total length of all extra-field data is less than 64KB.
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(In fact, PKWARE requires that the total length of the entire file header,
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including timestamp, file attributes, filename, comment, extra field, etc.,
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be no more than 64KB.)
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Each extra-field type (or subblock) must contain a four-byte header con-
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sisting of a two-byte header ID and a two-byte length (little-endian) for
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the remaining data in the subblock. If there are additional subblocks
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within the extra field, the header for each one will appear immediately
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following the data for the previous subblock (i.e., with no padding for
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alignment).
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All integer fields in the descriptions below are in little-endian (Intel)
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format unless otherwise specified. Note that "Short" means two bytes,
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"Long" means four bytes, and "Long-Long" means eight bytes, regardless
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of their native sizes. Unless specifically noted, all integer fields should
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be interpreted as unsigned (non-negative) numbers.
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Christian Spieler, Ed Gordon, 20080717
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-------------------------
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Header ID's of 0 thru 31 are reserved for use by PKWARE.
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The remaining ID's can be used by third party vendors for
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proprietary usage.
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The current Header ID mappings defined by PKWARE are:
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0x0001 Zip64 extended information extra field
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0x0007 AV Info
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0x0008 Reserved for extended language encoding data (PFS)
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0x0009 OS/2 extended attributes (also Info-ZIP)
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0x000a NTFS (Win9x/WinNT FileTimes)
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0x000c OpenVMS (also Info-ZIP)
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0x000d UNIX
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0x000e Reserved for file stream and fork descriptors
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0x000f Patch Descriptor
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0x0014 PKCS#7 Store for X.509 Certificates
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0x0015 X.509 Certificate ID and Signature for
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individual file
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0x0016 X.509 Certificate ID for Central Directory
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0x0017 Strong Encryption Header
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0x0018 Record Management Controls
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0x0019 PKCS#7 Encryption Recipient Certificate List
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0x0065 IBM S/390 (Z390), AS/400 (I400) attributes
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- uncompressed
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0x0066 Reserved for IBM S/390 (Z390), AS/400 (I400)
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attributes - compressed
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0x4690 POSZIP 4690 (reserved)
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The Header ID mappings defined by Info-ZIP and third parties are:
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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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0x2805 ZipIt Macintosh 1.3.5+
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0x334d Info-ZIP Macintosh (new, D. Haase's 'Mac3' field)
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0x4154 Tandem NSK
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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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0x4854 Theos, old inofficial port
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0x4b46 FWKCS MD5 (see below)
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0x4c41 OS/2 access control list (text ACL)
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0x4d49 Info-ZIP OpenVMS (obsolete)
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0x4d63 Macintosh SmartZIP, by Macro Bambini
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0x4f4c Xceed original location extra field
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0x5356 AOS/VS (binary ACL)
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0x5455 extended timestamp
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0x554e Xceed unicode extra field
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0x5855 Info-ZIP UNIX (original; also OS/2, NT, etc.)
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0x6375 Info-ZIP UTF-8 comment field
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0x6542 BeOS (BeBox, PowerMac, etc.)
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0x6854 Theos
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0x7075 Info-ZIP UTF-8 name field
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0x7441 AtheOS (AtheOS/Syllable attributes)
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0x756e ASi UNIX
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0x7855 Info-ZIP UNIX (16-bit UID/GID info)
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0x7875 Info-ZIP UNIX 3rd generation (generic UID/GID, ...)
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0xa220 Microsoft Open Packaging Growth Hint
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0xfb4a SMS/QDOS
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The following are detailed descriptions of the known extra-field block types:
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-Zip64 Extended Information Extra Field (0x0001):
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===============================================
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The following is the layout of the zip64 extended
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information "extra" block. If one of the size or
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offset fields in the Local or Central directory
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record is too small to hold the required data,
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a zip64 extended information record is created.
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The order of the fields in the zip64 extended
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information record is fixed, but the fields will
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only appear if the corresponding Local or Central
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directory record field is set to 0xFFFF or 0xFFFFFFFF.
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Note: all fields stored in Intel low-byte/high-byte order.
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Value Size Description
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----- ---- -----------
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(ZIP64) 0x0001 2 bytes Tag for this "extra" block type
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Size 2 bytes Size of this "extra" block
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Original
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Size 8 bytes Original uncompressed file size
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Compressed
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Size 8 bytes Size of compressed data
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Relative Header
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Offset 8 bytes Offset of local header record
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Disk Start
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Number 4 bytes Number of the disk on which
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this file starts
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This entry in the Local header must include BOTH original
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and compressed file size fields. If encrypting the
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central directory and bit 13 of the general purpose bit
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flag is set indicating masking, the value stored in the
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Local Header for the original file size will be zero.
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-OS/2 Extended Attributes Extra Field (0x0009):
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=============================================
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The following is the layout of the OS/2 extended attributes "extra"
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block. (Last Revision 19960922)
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Note: all fields stored in Intel low-byte/high-byte order.
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Local-header version:
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Value Size Description
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----- ---- -----------
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(OS/2) 0x0009 Short tag for this extra block type
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TSize Short total data size for this block
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BSize Long uncompressed EA data size
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CType Short compression type
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EACRC Long CRC value for uncompressed EA data
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(var.) variable compressed EA data
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Central-header version:
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Value Size Description
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----- ---- -----------
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(OS/2) 0x0009 Short tag for this extra block type
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TSize Short total data size for this block (4)
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BSize Long size of uncompressed local EA data
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The value of CType is interpreted according to the "compression
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method" section above; i.e., 0 for stored, 8 for deflated, etc.
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The OS/2 extended attribute structure (FEA2LIST) is
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compressed and then stored in its entirety within this
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structure. There will only ever be one "block" of data in
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the variable-length field.
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-OS/2 Access Control List Extra Field:
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====================================
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The following is the layout of the OS/2 ACL extra block.
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(Last Revision 19960922)
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Local-header version:
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Value Size Description
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----- ---- -----------
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(ACL) 0x4c41 Short tag for this extra block type ("AL")
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TSize Short total data size for this block
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BSize Long uncompressed ACL data size
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CType Short compression type
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EACRC Long CRC value for uncompressed ACL data
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(var.) variable compressed ACL data
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Central-header version:
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Value Size Description
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----- ---- -----------
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(ACL) 0x4c41 Short tag for this extra block type ("AL")
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TSize Short total data size for this block (4)
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BSize Long size of uncompressed local ACL data
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The value of CType is interpreted according to the "compression
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method" section above; i.e., 0 for stored, 8 for deflated, etc.
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The uncompressed ACL data consist of a text header of the form
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"ACL1:%hX,%hd\n", where the first field is the OS/2 ACCINFO acc_attr
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member and the second is acc_count, followed by acc_count strings
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of the form "%s,%hx\n", where the first field is acl_ugname (user
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group name) and the second acl_access. This block type will be
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extended for other operating systems as needed.
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-Windows NT Security Descriptor Extra Field (0x4453):
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===================================================
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The following is the layout of the NT Security Descriptor (another
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type of ACL) extra block. (Last Revision 19960922)
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Local-header version:
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Value Size Description
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----- ---- -----------
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(SD) 0x4453 Short tag for this extra block type ("SD")
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TSize Short total data size for this block
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BSize Long uncompressed SD data size
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Version Byte version of uncompressed SD data format
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CType Short compression type
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EACRC Long CRC value for uncompressed SD data
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(var.) variable compressed SD data
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Central-header version:
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Value Size Description
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----- ---- -----------
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(SD) 0x4453 Short tag for this extra block type ("SD")
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TSize Short total data size for this block (4)
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BSize Long size of uncompressed local SD data
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The value of CType is interpreted according to the "compression
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method" section above; i.e., 0 for stored, 8 for deflated, etc.
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Version specifies how the compressed data are to be interpreted
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and allows for future expansion of this extra field type. Currently
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only version 0 is defined.
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For version 0, the compressed data are to be interpreted as a single
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valid Windows NT SECURITY_DESCRIPTOR data structure, in self-relative
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format.
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-PKWARE Win95/WinNT Extra Field (0x000a):
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=======================================
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The following description covers PKWARE's "NTFS" attributes
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"extra" block, introduced with the release of PKZIP 2.50 for
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Windows. (Last Revision 20001118)
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(Note: At this time the Mtime, Atime and Ctime values may
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be used on any WIN32 system.)
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[Info-ZIP note: In the current implementations, this field has
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a fixed total data size of 32 bytes and is only stored as local
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extra field.]
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Value Size Description
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----- ---- -----------
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(NTFS) 0x000a Short Tag for this "extra" block type
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TSize Short Total Data Size for this block
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Reserved Long for future use
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Tag1 Short NTFS attribute tag value #1
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Size1 Short Size of attribute #1, in bytes
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(var.) SubSize1 Attribute #1 data
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.
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.
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.
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TagN Short NTFS attribute tag value #N
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SizeN Short Size of attribute #N, in bytes
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(var.) SubSizeN Attribute #N data
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For NTFS, values for Tag1 through TagN are as follows:
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(currently only one set of attributes is defined for NTFS)
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Tag Size Description
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----- ---- -----------
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0x0001 2 bytes Tag for attribute #1
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Size1 2 bytes Size of attribute #1, in bytes (24)
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Mtime 8 bytes 64-bit NTFS file last modification time
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Atime 8 bytes 64-bit NTFS file last access time
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Ctime 8 bytes 64-bit NTFS file creation time
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The total length for this block is 28 bytes, resulting in a
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fixed size value of 32 for the TSize field of the NTFS block.
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The NTFS filetimes are 64-bit unsigned integers, stored in Intel
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(least significant byte first) byte order. They determine the
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number of 1.0E-07 seconds (1/10th microseconds!) past WinNT "epoch",
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which is "01-Jan-1601 00:00:00 UTC".
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-PKWARE OpenVMS Extra Field (0x000c):
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===================================
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The following is the layout of PKWARE's OpenVMS attributes
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"extra" block. (Last Revision 12/17/91)
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Note: all fields stored in Intel low-byte/high-byte order.
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Value Size Description
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----- ---- -----------
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(VMS) 0x000c Short Tag for this "extra" block type
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TSize Short Total Data Size for this block
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CRC Long 32-bit CRC for remainder of the block
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Tag1 Short OpenVMS attribute tag value #1
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Size1 Short Size of attribute #1, in bytes
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(var.) Size1 Attribute #1 data
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.
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.
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.
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TagN Short OpenVMS attribute tag value #N
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SizeN Short Size of attribute #N, in bytes
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(var.) SizeN Attribute #N data
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Rules:
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1. There will be one or more of attributes present, which
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will each be preceded by the above TagX & SizeX values.
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These values are identical to the ATR$C_XXXX and
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ATR$S_XXXX constants which are defined in ATR.H under
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OpenVMS C. Neither of these values will ever be zero.
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2. No word alignment or padding is performed.
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3. A well-behaved PKZIP/OpenVMS program should never produce
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more than one sub-block with the same TagX value. Also,
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there will never be more than one "extra" block of type
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0x000c in a particular directory record.
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-Info-ZIP VMS Extra Field:
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========================
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The following is the layout of Info-ZIP's VMS attributes extra
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block for VAX or Alpha AXP. The local-header and central-header
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versions are identical. (Last Revision 19960922)
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Value Size Description
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----- ---- -----------
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(VMS2) 0x4d49 Short tag for this extra block type ("JM")
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TSize Short total data size for this block
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ID Long block ID
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Flags Short info bytes
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BSize Short uncompressed block size
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Reserved Long (reserved)
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(var.) variable compressed VMS file-attributes block
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The block ID is one of the following unterminated strings:
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"VFAB" struct FAB
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"VALL" struct XABALL
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"VFHC" struct XABFHC
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"VDAT" struct XABDAT
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"VRDT" struct XABRDT
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"VPRO" struct XABPRO
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"VKEY" struct XABKEY
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"VMSV" version (e.g., "V6.1"; truncated at hyphen)
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"VNAM" reserved
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The lower three bits of Flags indicate the compression method. The
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currently defined methods are:
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0 stored (not compressed)
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1 simple "RLE"
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2 deflated
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The "RLE" method simply replaces zero-valued bytes with zero-valued
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bits and non-zero-valued bytes with a "1" bit followed by the byte
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value.
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The variable-length compressed data contains only the data corre-
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sponding to the indicated structure or string. Typically multiple
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VMS2 extra fields are present (each with a unique block type).
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-Info-ZIP Macintosh Extra Field:
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==============================
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The following is the layout of the (old) Info-ZIP resource-fork extra
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block for Macintosh. The local-header and central-header versions
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are identical. (Last Revision 19960922)
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Value Size Description
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----- ---- -----------
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(Mac) 0x07c8 Short tag for this extra block type
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TSize Short total data size for this block
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"JLEE" beLong extra-field signature
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FInfo 16 bytes Macintosh FInfo structure
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CrDat beLong HParamBlockRec fileParam.ioFlCrDat
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MdDat beLong HParamBlockRec fileParam.ioFlMdDat
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Flags beLong info bits
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DirID beLong HParamBlockRec fileParam.ioDirID
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VolName 28 bytes volume name (optional)
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All fields but the first two are in native Macintosh format
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(big-endian Motorola order, not little-endian Intel). The least
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significant bit of Flags is 1 if the file is a data fork, 0 other-
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wise. In addition, if this extra field is present, the filename
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has an extra 'd' or 'r' appended to indicate data fork or resource
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fork. The 28-byte VolName field may be omitted.
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-ZipIt Macintosh Extra Field (long):
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==================================
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The following is the layout of the ZipIt extra block for Macintosh.
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The local-header and central-header versions are identical.
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(Last Revision 19970130)
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Value Size Description
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----- ---- -----------
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(Mac2) 0x2605 Short tag for this extra block type
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TSize Short total data size for this block
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"ZPIT" beLong extra-field signature
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FnLen Byte length of FileName
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FileName variable full Macintosh filename
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FileType Byte[4] four-byte Mac file type string
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Creator Byte[4] four-byte Mac creator string
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-ZipIt Macintosh Extra Field (short, for files):
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==============================================
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The following is the layout of a shortened variant of the
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ZipIt extra block for Macintosh (without "full name" entry).
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This variant is used by ZipIt 1.3.5 and newer for entries of
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files (not directories) that do not have a MacBinary encoded
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file. The local-header and central-header versions are identical.
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(Last Revision 20030602)
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Value Size Description
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----- ---- -----------
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(Mac2b) 0x2705 Short tag for this extra block type
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TSize Short total data size for this block (min. 12)
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"ZPIT" beLong extra-field signature
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FileType Byte[4] four-byte Mac file type string
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Creator Byte[4] four-byte Mac creator string
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fdFlags beShort attributes from FInfo.frFlags,
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may be omitted
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0x0000 beShort reserved, may be omitted
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-ZipIt Macintosh Extra Field (short, for directories):
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====================================================
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The following is the layout of a shortened variant of the
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ZipIt extra block for Macintosh used only for directory
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entries. This variant is used by ZipIt 1.3.5 and newer to
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save some optional Mac-specific information about directories.
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The local-header and central-header versions are identical.
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Value Size Description
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----- ---- -----------
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(Mac2c) 0x2805 Short tag for this extra block type
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TSize Short total data size for this block (12)
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"ZPIT" beLong extra-field signature
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frFlags beShort attributes from DInfo.frFlags, may
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be omitted
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View beShort ZipIt view flag, may be omitted
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The View field specifies ZipIt-internal settings as follows:
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Bits of the Flags:
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bit 0 if set, the folder is shown expanded (open)
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when the archive contents are viewed in ZipIt.
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bits 1-15 reserved, zero;
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-Info-ZIP Macintosh Extra Field (new):
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====================================
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The following is the layout of the (new) Info-ZIP extra
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block for Macintosh, designed by Dirk Haase.
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All values are in little-endian.
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(Last Revision 19981005)
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Local-header version:
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Value Size Description
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----- ---- -----------
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(Mac3) 0x334d Short tag for this extra block type ("M3")
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TSize Short total data size for this block
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BSize Long uncompressed finder attribute data size
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Flags Short info bits
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fdType Byte[4] Type of the File (4-byte string)
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fdCreator Byte[4] Creator of the File (4-byte string)
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(CType) Short compression type
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(CRC) Long CRC value for uncompressed MacOS data
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Attribs variable finder attribute data (see below)
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|
Central-header version:
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|
Value Size Description
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|
----- ---- -----------
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(Mac3) 0x334d Short tag for this extra block type ("M3")
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TSize Short total data size for this block
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BSize Long uncompressed finder attribute data size
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Flags Short info bits
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fdType Byte[4] Type of the File (4-byte string)
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fdCreator Byte[4] Creator of the File (4-byte string)
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The third bit of Flags in both headers indicates whether
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the LOCAL extra field is uncompressed (and therefore whether CType
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and CRC are omitted):
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|
Bits of the Flags:
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bit 0 if set, file is a data fork; otherwise unset
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bit 1 if set, filename will be not changed
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bit 2 if set, Attribs is uncompressed (no CType, CRC)
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bit 3 if set, date and times are in 64 bit
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if zero date and times are in 32 bit.
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bit 4 if set, timezone offsets fields for the native
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Mac times are omitted (UTC support deactivated)
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bits 5-15 reserved;
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Attributes:
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|
|
Attribs is a Mac-specific block of data in little-endian format with
|
|
the following structure (if compressed, uncompress it first):
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
fdFlags Short Finder Flags
|
|
fdLocation.v Short Finder Icon Location
|
|
fdLocation.h Short Finder Icon Location
|
|
fdFldr Short Folder containing file
|
|
|
|
FXInfo 16 bytes Macintosh FXInfo structure
|
|
FXInfo-Structure:
|
|
fdIconID Short
|
|
fdUnused[3] Short unused but reserved 6 bytes
|
|
fdScript Byte Script flag and number
|
|
fdXFlags Byte More flag bits
|
|
fdComment Short Comment ID
|
|
fdPutAway Long Home Dir ID
|
|
|
|
FVersNum Byte file version number
|
|
may be not used by MacOS
|
|
ACUser Byte directory access rights
|
|
|
|
FlCrDat ULong date and time of creation
|
|
FlMdDat ULong date and time of last modification
|
|
FlBkDat ULong date and time of last backup
|
|
These time numbers are original Mac FileTime values (local time!).
|
|
Currently, date-time width is 32-bit, but future version may
|
|
support be 64-bit times (see flags)
|
|
|
|
CrGMTOffs Long(signed!) difference "local Creat. time - UTC"
|
|
MdGMTOffs Long(signed!) difference "local Modif. time - UTC"
|
|
BkGMTOffs Long(signed!) difference "local Backup time - UTC"
|
|
These "local time - UTC" differences (stored in seconds) may be
|
|
used to support timestamp adjustment after inter-timezone transfer.
|
|
These fields are optional; bit 4 of the flags word controls their
|
|
presence.
|
|
|
|
Charset Short TextEncodingBase (Charset)
|
|
valid for the following two fields
|
|
|
|
FullPath variable Path of the current file.
|
|
Zero terminated string (C-String)
|
|
Currently coded in the native Charset.
|
|
|
|
Comment variable Finder Comment of the current file.
|
|
Zero terminated string (C-String)
|
|
Currently coded in the native Charset.
|
|
|
|
|
|
-SmartZIP Macintosh Extra Field:
|
|
====================================
|
|
|
|
The following is the layout of the SmartZIP extra
|
|
block for Macintosh, designed by Marco Bambini.
|
|
|
|
Local-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
0x4d63 Short tag for this extra block type ("cM")
|
|
TSize Short total data size for this block (64)
|
|
"dZip" beLong extra-field signature
|
|
fdType Byte[4] Type of the File (4-byte string)
|
|
fdCreator Byte[4] Creator of the File (4-byte string)
|
|
fdFlags beShort Finder Flags
|
|
fdLocation.v beShort Finder Icon Location
|
|
fdLocation.h beShort Finder Icon Location
|
|
fdFldr beShort Folder containing file
|
|
CrDat beLong HParamBlockRec fileParam.ioFlCrDat
|
|
MdDat beLong HParamBlockRec fileParam.ioFlMdDat
|
|
frScroll.v Byte vertical pos. of folder's scroll bar
|
|
fdScript Byte Script flag and number
|
|
frScroll.h Byte horizontal pos. of folder's scroll bar
|
|
fdXFlags Byte More flag bits
|
|
FileName Byte[32] full Macintosh filename (pascal string)
|
|
|
|
All fields but the first two are in native Macintosh format
|
|
(big-endian Motorola order, not little-endian Intel).
|
|
The extra field size is fixed to 64 bytes.
|
|
The local-header and central-header versions are identical.
|
|
|
|
|
|
-Acorn SparkFS Extra Field:
|
|
=========================
|
|
|
|
The following is the layout of David Pilling's SparkFS extra block
|
|
for Acorn RISC OS. The local-header and central-header versions are
|
|
identical. (Last Revision 19960922)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Acorn) 0x4341 Short tag for this extra block type ("AC")
|
|
TSize Short total data size for this block (20)
|
|
"ARC0" Long extra-field signature
|
|
LoadAddr Long load address or file type
|
|
ExecAddr Long exec address
|
|
Attr Long file permissions
|
|
Zero Long reserved; always zero
|
|
|
|
The following bits of Attr are associated with the given file
|
|
permissions:
|
|
|
|
bit 0 user-writable ('W')
|
|
bit 1 user-readable ('R')
|
|
bit 2 reserved
|
|
bit 3 locked ('L')
|
|
bit 4 publicly writable ('w')
|
|
bit 5 publicly readable ('r')
|
|
bit 6 reserved
|
|
bit 7 reserved
|
|
|
|
|
|
-VM/CMS Extra Field:
|
|
==================
|
|
|
|
The following is the layout of the file-attributes extra block for
|
|
VM/CMS. The local-header and central-header versions are
|
|
identical. (Last Revision 19960922)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(VM/CMS) 0x4704 Short tag for this extra block type
|
|
TSize Short total data size for this block
|
|
flData variable file attributes data
|
|
|
|
flData is an uncompressed fldata_t struct.
|
|
|
|
|
|
-MVS Extra Field:
|
|
===============
|
|
|
|
The following is the layout of the file-attributes extra block for
|
|
MVS. The local-header and central-header versions are identical.
|
|
(Last Revision 19960922)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(MVS) 0x470f Short tag for this extra block type
|
|
TSize Short total data size for this block
|
|
flData variable file attributes data
|
|
|
|
flData is an uncompressed fldata_t struct.
|
|
|
|
|
|
-PKWARE Unix Extra Field (0x000d):
|
|
================================
|
|
|
|
The following is the layout of PKWARE's Unix "extra" block.
|
|
It was introduced with the release of PKZIP for Unix 2.50.
|
|
Note: all fields are stored in Intel low-byte/high-byte order.
|
|
(Last Revision 19980901)
|
|
|
|
This field has a minimum data size of 12 bytes and is only stored
|
|
as local extra field.
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Unix0) 0x000d Short Tag for this "extra" block type
|
|
TSize Short Total Data Size for this block
|
|
AcTime Long time of last access (UTC/GMT)
|
|
ModTime Long time of last modification (UTC/GMT)
|
|
UID Short Unix user ID
|
|
GID Short Unix group ID
|
|
(var) variable Variable length data field
|
|
|
|
The variable length data field will contain file type
|
|
specific data. Currently the only values allowed are
|
|
the original "linked to" file names for hard or symbolic
|
|
links, and the major and minor device node numbers for
|
|
character and block device nodes. Since device nodes
|
|
cannot be either symbolic or hard links, only one set of
|
|
variable length data is stored. Link files will have the
|
|
name of the original file stored. This name is NOT NULL
|
|
terminated. Its size can be determined by checking TSize -
|
|
12. Device entries will have eight bytes stored as two 4
|
|
byte entries (in little-endian format). The first entry
|
|
will be the major device number, and the second the minor
|
|
device number.
|
|
|
|
[Info-ZIP note: The fixed part of this field has the same layout as
|
|
Info-ZIP's abandoned "Unix1 timestamps & owner ID info" extra field;
|
|
only the two tag bytes are different.]
|
|
|
|
|
|
-PATCH Descriptor Extra Field (0x000f):
|
|
=====================================
|
|
|
|
The following is the layout of the Patch Descriptor "extra"
|
|
block.
|
|
|
|
Note: all fields stored in Intel low-byte/high-byte order.
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Patch) 0x000f Short Tag for this "extra" block type
|
|
TSize Short Size of the total "extra" block
|
|
Version Short Version of the descriptor
|
|
Flags Long Actions and reactions (see below)
|
|
OldSize Long Size of the file about to be patched
|
|
OldCRC Long 32-bit CRC of the file about to be patched
|
|
NewSize Long Size of the resulting file
|
|
NewCRC Long 32-bit CRC of the resulting file
|
|
|
|
|
|
Actions and reactions
|
|
|
|
Bits Description
|
|
---- ----------------
|
|
0 Use for auto detection
|
|
1 Treat as a self-patch
|
|
2-3 RESERVED
|
|
4-5 Action (see below)
|
|
6-7 RESERVED
|
|
8-9 Reaction (see below) to absent file
|
|
10-11 Reaction (see below) to newer file
|
|
12-13 Reaction (see below) to unknown file
|
|
14-15 RESERVED
|
|
16-31 RESERVED
|
|
|
|
Actions
|
|
|
|
Action Value
|
|
------ -----
|
|
none 0
|
|
add 1
|
|
delete 2
|
|
patch 3
|
|
|
|
Reactions
|
|
|
|
Reaction Value
|
|
-------- -----
|
|
ask 0
|
|
skip 1
|
|
ignore 2
|
|
fail 3
|
|
|
|
Patch support is provided by PKPatchMaker(tm) technology and is
|
|
covered under U.S. Patents and Patents Pending. The use or
|
|
implementation in a product of certain technological aspects set
|
|
forth in the current APPNOTE, including those with regard to
|
|
strong encryption, patching, or extended tape operations requires
|
|
a license from PKWARE. Please contact PKWARE with regard to
|
|
acquiring a license.
|
|
|
|
|
|
-PKCS#7 Store for X.509 Certificates (0x0014):
|
|
============================================
|
|
|
|
This field contains information about each of the certificates
|
|
files may be signed with. When the Central Directory Encryption
|
|
feature is enabled for a ZIP file, this record will appear in
|
|
the Archive Extra Data Record, otherwise it will appear in the
|
|
first central directory record and will be ignored in any
|
|
other record.
|
|
|
|
Note: all fields stored in Intel low-byte/high-byte order.
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Store) 0x0014 2 bytes Tag for this "extra" block type
|
|
TSize 2 bytes Size of the store data
|
|
SData TSize Data about the store
|
|
|
|
SData
|
|
Value Size Description
|
|
----- ---- -----------
|
|
Version 2 bytes Version number, 0x0001 for now
|
|
StoreD (variable) Actual store data
|
|
|
|
The StoreD member is suitable for passing as the pbData
|
|
member of a CRYPT_DATA_BLOB to the CertOpenStore() function
|
|
in Microsoft's CryptoAPI. The SSize member above will be
|
|
cbData + 6, where cbData is the cbData member of the same
|
|
CRYPT_DATA_BLOB. The encoding type to pass to
|
|
CertOpenStore() should be
|
|
PKCS_7_ANS_ENCODING | X509_ASN_ENCODING.
|
|
|
|
|
|
-X.509 Certificate ID and Signature for individual file (0x0015):
|
|
===============================================================
|
|
|
|
This field contains the information about which certificate in
|
|
the PKCS#7 store was used to sign a particular file. It also
|
|
contains the signature data. This field can appear multiple
|
|
times, but can only appear once per certificate.
|
|
|
|
Note: all fields stored in Intel low-byte/high-byte order.
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(CID) 0x0015 2 bytes Tag for this "extra" block type
|
|
CSize 2 bytes Size of Method
|
|
Method (variable)
|
|
|
|
Method
|
|
Value Size Description
|
|
----- ---- -----------
|
|
Version 2 bytes Version number, for now 0x0001
|
|
AlgID 2 bytes Algorithm ID used for signing
|
|
IDSize 2 bytes Size of Certificate ID data
|
|
CertID (variable) Certificate ID data
|
|
SigSize 2 bytes Size of Signature data
|
|
Sig (variable) Signature data
|
|
|
|
CertID
|
|
Value Size Description
|
|
----- ---- -----------
|
|
Size1 4 bytes Size of CertID, should be (IDSize - 4)
|
|
Size1 4 bytes A bug in version one causes this value
|
|
to appear twice.
|
|
IssSize 4 bytes Issuer data size
|
|
Issuer (variable) Issuer data
|
|
SerSize 4 bytes Serial Number size
|
|
Serial (variable) Serial Number data
|
|
|
|
The Issuer and IssSize members are suitable for creating a
|
|
CRYPT_DATA_BLOB to be the Issuer member of a CERT_INFO
|
|
struct. The Serial and SerSize members would be the
|
|
SerialNumber member of the same CERT_INFO struct. This
|
|
struct would be used to find the certificate in the store
|
|
the file was signed with. Those structures are from the MS
|
|
CryptoAPI.
|
|
|
|
Sig and SigSize are the actual signature data and size
|
|
generated by signing the file with the MS CryptoAPI using a
|
|
hash created with the given AlgID.
|
|
|
|
|
|
-X.509 Certificate ID and Signature for central directory (0x0016):
|
|
=================================================================
|
|
|
|
This field contains the information about which certificate in
|
|
the PKCS#7 store was used to sign the central directory structure.
|
|
When the Central Directory Encryption feature is enabled for a
|
|
ZIP file, this record will appear in the Archive Extra Data Record,
|
|
otherwise it will appear in the first central directory record,
|
|
along with the store. The data structure is the
|
|
same as the CID, except that SigSize will be 0, and there
|
|
will be no Sig member.
|
|
|
|
This field is also kept after the last central directory
|
|
record, as the signature data (ID 0x05054b50, it looks like
|
|
a central directory record of a different type). This
|
|
second copy of the data is the Signature Data member of the
|
|
record, and will have a SigSize that is non-zero, and will
|
|
have Sig data.
|
|
|
|
Note: all fields stored in Intel low-byte/high-byte order.
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(CDID) 0x0016 2 bytes Tag for this "extra" block type
|
|
TSize 2 bytes Size of data that follows
|
|
TData TSize Data
|
|
|
|
|
|
-Strong Encryption Header (0x0017):
|
|
=================================
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
0x0017 2 bytes Tag for this "extra" block type
|
|
TSize 2 bytes Size of data that follows
|
|
Format 2 bytes Format definition for this record
|
|
AlgID 2 bytes Encryption algorithm identifier
|
|
Bitlen 2 bytes Bit length of encryption key
|
|
Flags 2 bytes Processing flags
|
|
CertData TSize-8 Certificate decryption extra field data
|
|
(refer to the explanation for CertData
|
|
in the section describing the
|
|
Certificate Processing Method under
|
|
the Strong Encryption Specification)
|
|
|
|
|
|
-Record Management Controls (0x0018):
|
|
===================================
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Rec-CTL) 0x0018 2 bytes Tag for this "extra" block type
|
|
CSize 2 bytes Size of total extra block data
|
|
Tag1 2 bytes Record control attribute 1
|
|
Size1 2 bytes Size of attribute 1, in bytes
|
|
Data1 Size1 Attribute 1 data
|
|
.
|
|
.
|
|
.
|
|
TagN 2 bytes Record control attribute N
|
|
SizeN 2 bytes Size of attribute N, in bytes
|
|
DataN SizeN Attribute N data
|
|
|
|
|
|
-PKCS#7 Encryption Recipient Certificate List (0x0019):
|
|
=====================================================
|
|
|
|
This field contains information about each of the certificates
|
|
used in encryption processing and it can be used to identify who is
|
|
allowed to decrypt encrypted files. This field should only appear
|
|
in the archive extra data record. This field is not required and
|
|
serves only to aide archive modifications by preserving public
|
|
encryption key data. Individual security requirements may dictate
|
|
that this data be omitted to deter information exposure.
|
|
|
|
Note: all fields stored in Intel low-byte/high-byte order.
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(CStore) 0x0019 2 bytes Tag for this "extra" block type
|
|
TSize 2 bytes Size of the store data
|
|
TData TSize Data about the store
|
|
|
|
TData:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
Version 2 bytes Format version number - must 0x0001 at this time
|
|
CStore (var) PKCS#7 data blob
|
|
|
|
|
|
-MVS Extra Field (PKWARE, 0x0065):
|
|
================================
|
|
|
|
The following is the layout of the MVS "extra" block.
|
|
Note: Some fields are stored in Big Endian format.
|
|
All text is in EBCDIC format unless otherwise specified.
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(MVS) 0x0065 2 bytes Tag for this "extra" block type
|
|
TSize 2 bytes Size for the following data block
|
|
ID 4 bytes EBCDIC "Z390" 0xE9F3F9F0 or
|
|
"T4MV" for TargetFour
|
|
(var) TSize-4 Attribute data
|
|
|
|
|
|
-OS/400 Extra Field (0x0065):
|
|
===========================
|
|
|
|
The following is the layout of the OS/400 "extra" block.
|
|
Note: Some fields are stored in Big Endian format.
|
|
All text is in EBCDIC format unless otherwise specified.
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(OS400) 0x0065 2 bytes Tag for this "extra" block type
|
|
TSize 2 bytes Size for the following data block
|
|
ID 4 bytes EBCDIC "I400" 0xC9F4F0F0 or
|
|
"T4MV" for TargetFour
|
|
(var) TSize-4 Attribute data
|
|
|
|
|
|
-Info-ZIP Unicode Path Extra Field:
|
|
=================================
|
|
|
|
Stores the UTF-8 version of the entry path as stored in the
|
|
local header and central directory header.
|
|
(Last Revision 20070912)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(UPath) 0x7075 Short tag for this extra block type ("up")
|
|
TSize Short total data size for this block
|
|
Version Byte version of this extra field, currently 1
|
|
NameCRC32 Long CRC-32 checksum of standard name field
|
|
UnicodeName variable UTF-8 version of the entry file name
|
|
|
|
Currently Version is set to the number 1. If there is a need
|
|
to change this field, the version will be incremented. Changes
|
|
may not be backward compatible so this extra field should not be
|
|
used if the version is not recognized.
|
|
|
|
The NameCRC32 is the standard zip CRC32 checksum of the File Name
|
|
field in the header. This is used to verify that the header
|
|
File Name field has not changed since the Unicode Path extra field
|
|
was created. This can happen if a utility renames the entry but
|
|
does not update the UTF-8 path extra field. If the CRC check fails,
|
|
this UTF-8 Path Extra Field should be ignored and the File Name field
|
|
in the header should be used instead.
|
|
|
|
The UnicodeName is the UTF-8 version of the contents of the File
|
|
Name field in the header, without any trailing NUL. The standard
|
|
name field in the Zip entry header remains filled with the entry
|
|
name coded in the local machine's extended ASCII system charset.
|
|
As UnicodeName is defined to be UTF-8, no UTF-8 byte order mark
|
|
(BOM) is used. The length of this field is determined by
|
|
subtracting the size of the previous fields from TSize.
|
|
If both the File Name and Comment fields are UTF-8, the new General
|
|
Purpose Bit Flag, bit 11 (Language encoding flag (EFS)), should be
|
|
used to indicate that both the header File Name and Comment fields
|
|
are UTF-8 and, in this case, the Unicode Path and Unicode Comment
|
|
extra fields are not needed and should not be created. Note that,
|
|
for backward compatibility, bit 11 should only be used if the native
|
|
character set of the paths and comments being zipped up are already
|
|
in UTF-8. The same method, either general purpose bit 11 or extra
|
|
fields, should be used in both the Local and Central Directory Header
|
|
for a file.
|
|
|
|
Utilisation rules:
|
|
1. This field shall never be created for names consisting solely of
|
|
7-bit ASCII characters.
|
|
2. On a system that already uses UTF-8 as system charset, this field
|
|
shall not repeat the string pattern already stored in the Zip
|
|
entry's standard name field. Instead, a field of exactly 9 bytes
|
|
(70 75 05 00 01 and 4 bytes CRC) should be created.
|
|
In this form with 5 data bytes, the field serves as indicator
|
|
for the UTF-8 encoding of the standard Zip header's name field.
|
|
3. This field shall not be used whenever the calculated CRC-32 of
|
|
the entry's standard name field does not match the provided
|
|
CRC checksum value. A mismatch of the CRC check indicates that
|
|
the standard name field was changed by some non-"up"-aware
|
|
utility without synchronizing this UTF-8 name e.f. block.
|
|
|
|
|
|
-Info-ZIP Unicode Comment Extra Field:
|
|
====================================
|
|
|
|
Stores the UTF-8 version of the entry comment as stored in the
|
|
central directory header.
|
|
(Last Revision 20070912)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(UCom) 0x6375 Short tag for this extra block type ("uc")
|
|
TSize Short total data size for this block
|
|
Version 1 byte version of this extra field, currently 1
|
|
ComCRC32 4 bytes Comment Field CRC32 Checksum
|
|
UnicodeCom Variable UTF-8 version of the entry comment
|
|
|
|
Currently Version is set to the number 1. If there is a need
|
|
to change this field, the version will be incremented. Changes
|
|
may not be backward compatible so this extra field should not be
|
|
used if the version is not recognized.
|
|
|
|
The ComCRC32 is the standard zip CRC32 checksum of the Comment
|
|
field in the central directory header. This is used to verify that
|
|
the comment field has not changed since the Unicode Comment extra
|
|
field was created. This can happen if a utility changes the Comment
|
|
field but does not update the UTF-8 Comment extra field. If the CRC
|
|
check fails, this Unicode Comment extra field should be ignored and
|
|
the Comment field in the header used.
|
|
|
|
The UnicodeCom field is the UTF-8 version of the entry comment field
|
|
in the header. As UnicodeCom is defined to be UTF-8, no UTF-8 byte
|
|
order mark (BOM) is used. The length of this field is determined by
|
|
subtracting the size of the previous fields from TSize. If both the
|
|
File Name and Comment fields are UTF-8, the new General Purpose Bit
|
|
Flag, bit 11 (Language encoding flag (EFS)), can be used to indicate
|
|
both the header File Name and Comment fields are UTF-8 and, in this
|
|
case, the Unicode Path and Unicode Comment extra fields are not
|
|
needed and should not be created. Note that, for backward
|
|
compatibility, bit 11 should only be used if the native character set
|
|
of the paths and comments being zipped up are already in UTF-8. The
|
|
same method, either bit 11 or extra fields, should be used in both
|
|
the local and central directory headers.
|
|
|
|
|
|
-Extended Timestamp Extra Field:
|
|
==============================
|
|
|
|
The following is the layout of the extended-timestamp extra block.
|
|
(Last Revision 19970118)
|
|
|
|
Local-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(time) 0x5455 Short tag for this extra block type ("UT")
|
|
TSize Short total data size for this block
|
|
Flags Byte info bits
|
|
(ModTime) Long time of last modification (UTC/GMT)
|
|
(AcTime) Long time of last access (UTC/GMT)
|
|
(CrTime) Long time of original creation (UTC/GMT)
|
|
|
|
Central-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(time) 0x5455 Short tag for this extra block type ("UT")
|
|
TSize Short total data size for this block
|
|
Flags Byte info bits (refers to local header!)
|
|
(ModTime) Long time of last modification (UTC/GMT)
|
|
|
|
The central-header extra field contains the modification time only,
|
|
or no timestamp at all. TSize is used to flag its presence or
|
|
absence. But note:
|
|
|
|
If "Flags" indicates that Modtime is present in the local header
|
|
field, it MUST be present in the central header field, too!
|
|
This correspondence is required because the modification time
|
|
value may be used to support trans-timezone freshening and
|
|
updating operations with zip archives.
|
|
|
|
The time values are in standard Unix signed-long format, indicating
|
|
the number of seconds since 1 January 1970 00:00:00. The times
|
|
are relative to Coordinated Universal Time (UTC), also sometimes
|
|
referred to as Greenwich Mean Time (GMT). To convert to local time,
|
|
the software must know the local timezone offset from UTC/GMT.
|
|
|
|
The lower three bits of Flags in both headers indicate which time-
|
|
stamps are present in the LOCAL extra field:
|
|
|
|
bit 0 if set, modification time is present
|
|
bit 1 if set, access time is present
|
|
bit 2 if set, creation time is present
|
|
bits 3-7 reserved for additional timestamps; not set
|
|
|
|
Those times that are present will appear in the order indicated, but
|
|
any combination of times may be omitted. (Creation time may be
|
|
present without access time, for example.) TSize should equal
|
|
(1 + 4*(number of set bits in Flags)), as the block is currently
|
|
defined. Other timestamps may be added in the future.
|
|
|
|
|
|
-Info-ZIP Unix Extra Field (type 1):
|
|
==================================
|
|
|
|
The following is the layout of the old Info-ZIP extra block for
|
|
Unix. It has been replaced by the extended-timestamp extra block
|
|
(0x5455) and the Unix type 2 extra block (0x7855).
|
|
(Last Revision 19970118)
|
|
|
|
Local-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Unix1) 0x5855 Short tag for this extra block type ("UX")
|
|
TSize Short total data size for this block
|
|
AcTime Long time of last access (UTC/GMT)
|
|
ModTime Long time of last modification (UTC/GMT)
|
|
UID Short Unix user ID (optional)
|
|
GID Short Unix group ID (optional)
|
|
|
|
Central-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Unix1) 0x5855 Short tag for this extra block type ("UX")
|
|
TSize Short total data size for this block
|
|
AcTime Long time of last access (GMT/UTC)
|
|
ModTime Long time of last modification (GMT/UTC)
|
|
|
|
The file access and modification times are in standard Unix signed-
|
|
long format, indicating the number of seconds since 1 January 1970
|
|
00:00:00. The times are relative to Coordinated Universal Time
|
|
(UTC), also sometimes referred to as Greenwich Mean Time (GMT). To
|
|
convert to local time, the software must know the local timezone
|
|
offset from UTC/GMT. The modification time may be used by non-Unix
|
|
systems to support inter-timezone freshening and updating of zip
|
|
archives.
|
|
|
|
The local-header extra block may optionally contain UID and GID
|
|
info for the file. The local-header TSize value is the only
|
|
indication of this. Note that Unix UIDs and GIDs are usually
|
|
specific to a particular machine, and they generally require root
|
|
access to restore.
|
|
|
|
This extra field type is obsolete, but it has been in use since
|
|
mid-1994. Therefore future archiving software should continue to
|
|
support it. Some guidelines:
|
|
|
|
An archive member should either contain the old "Unix1"
|
|
extra field block or the new extra field types "time" and/or
|
|
"Unix2".
|
|
|
|
If both the old "Unix1" block type and one or both of the new
|
|
block types "time" and "Unix2" are found, the "Unix1" block
|
|
should be considered invalid and ignored.
|
|
|
|
Unarchiving software should recognize both old and new extra
|
|
field block types, but the info from new types overrides the
|
|
old "Unix1" field.
|
|
|
|
Archiving software should recognize "Unix1" extra fields for
|
|
timestamp comparison but never create it for updated, freshened
|
|
or new archive members. When copying existing members to a new
|
|
archive, any "Unix1" extra field blocks should be converted to
|
|
the new "time" and/or "Unix2" types.
|
|
|
|
|
|
-Info-ZIP UNIX Extra Field (type 2):
|
|
==================================
|
|
|
|
The following is the layout of the new Info-ZIP extra block for
|
|
Unix. (Last Revision 19960922)
|
|
|
|
Local-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Unix2) 0x7855 Short tag for this extra block type ("Ux")
|
|
TSize Short total data size for this block (4)
|
|
UID Short Unix user ID
|
|
GID Short Unix group ID
|
|
|
|
Central-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Unix2) 0x7855 Short tag for this extra block type ("Ux")
|
|
TSize Short total data size for this block (0)
|
|
|
|
The data size of the central-header version is zero; it is used
|
|
solely as a flag that UID/GID info is present in the local-header
|
|
extra field. If additional fields are ever added to the local
|
|
version, the central version may be extended to indicate this.
|
|
|
|
Note that Unix UIDs and GIDs are usually specific to a particular
|
|
machine, and they generally require root access to restore.
|
|
|
|
|
|
-Info-ZIP New Unix Extra Field:
|
|
====================================
|
|
|
|
Currently stores Unix UIDs/GIDs up to 32 bits.
|
|
(Last Revision 20080509)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(UnixN) 0x7875 Short tag for this extra block type ("ux")
|
|
TSize Short total data size for this block
|
|
Version 1 byte version of this extra field, currently 1
|
|
UIDSize 1 byte Size of UID field
|
|
UID Variable UID for this entry
|
|
GIDSize 1 byte Size of GID field
|
|
GID Variable GID for this entry
|
|
|
|
Currently Version is set to the number 1. If there is a need
|
|
to change this field, the version will be incremented. Changes
|
|
may not be backward compatible so this extra field should not be
|
|
used if the version is not recognized.
|
|
|
|
UIDSize is the size of the UID field in bytes. This size should
|
|
match the size of the UID field on the target OS.
|
|
|
|
UID is the UID for this entry in standard little endian format.
|
|
|
|
GIDSize is the size of the GID field in bytes. This size should
|
|
match the size of the GID field on the target OS.
|
|
|
|
GID is the GID for this entry in standard little endian format.
|
|
|
|
If both the old 16-bit Unix extra field (tag 0x7855, Info-ZIP Unix2)
|
|
and this extra field are present, the values in this extra field
|
|
supercede the values in that extra field.
|
|
|
|
|
|
-ASi UNIX Extra Field:
|
|
====================
|
|
|
|
The following is the layout of the ASi extra block for Unix. The
|
|
local-header and central-header versions are identical.
|
|
(Last Revision 19960916)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Unix3) 0x756e Short tag for this extra block type ("nu")
|
|
TSize Short total data size for this block
|
|
CRC Long CRC-32 of the remaining data
|
|
Mode Short file permissions
|
|
SizDev Long symlink'd size OR major/minor dev num
|
|
UID Short user ID
|
|
GID Short group ID
|
|
(var.) variable symbolic link filename
|
|
|
|
Mode is the standard Unix st_mode field from struct stat, containing
|
|
user/group/other permissions, setuid/setgid and symlink info, etc.
|
|
|
|
If Mode indicates that this file is a symbolic link, SizDev is the
|
|
size of the file to which the link points. Otherwise, if the file
|
|
is a device, SizDev contains the standard Unix st_rdev field from
|
|
struct stat (includes the major and minor numbers of the device).
|
|
SizDev is undefined in other cases.
|
|
|
|
If Mode indicates that the file is a symbolic link, the final field
|
|
will be the name of the file to which the link points. The file-
|
|
name length can be inferred from TSize.
|
|
|
|
[Note that TSize may incorrectly refer to the data size not counting
|
|
the CRC; i.e., it may be four bytes too small.]
|
|
|
|
|
|
-BeOS Extra Field:
|
|
================
|
|
|
|
The following is the layout of the file-attributes extra block for
|
|
BeOS. (Last Revision 19970531)
|
|
|
|
Local-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(BeOS) 0x6542 Short tag for this extra block type ("Be")
|
|
TSize Short total data size for this block
|
|
BSize Long uncompressed file attribute data size
|
|
Flags Byte info bits
|
|
(CType) Short compression type
|
|
(CRC) Long CRC value for uncompressed file attribs
|
|
Attribs variable file attribute data
|
|
|
|
Central-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(BeOS) 0x6542 Short tag for this extra block type ("Be")
|
|
TSize Short total data size for this block (5)
|
|
BSize Long size of uncompr. local EF block data
|
|
Flags Byte info bits
|
|
|
|
The least significant bit of Flags in both headers indicates whether
|
|
the LOCAL extra field is uncompressed (and therefore whether CType
|
|
and CRC are omitted):
|
|
|
|
bit 0 if set, Attribs is uncompressed (no CType, CRC)
|
|
bits 1-7 reserved; if set, assume error or unknown data
|
|
|
|
Currently the only supported compression types are deflated (type 8)
|
|
and stored (type 0); the latter is not used by Info-ZIP's Zip but is
|
|
supported by UnZip.
|
|
|
|
Attribs is a BeOS-specific block of data in big-endian format with
|
|
the following structure (if compressed, uncompress it first):
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
Name variable attribute name (null-terminated string)
|
|
Type Long attribute type (32-bit unsigned integer)
|
|
Size Long Long data size for this sub-block (64 bits)
|
|
Data variable attribute data
|
|
|
|
The attribute structure is repeated for every attribute. The Data
|
|
field may contain anything--text, flags, bitmaps, etc.
|
|
|
|
|
|
-AtheOS Extra Field:
|
|
==================
|
|
|
|
The following is the layout of the file-attributes extra block for
|
|
AtheOS. This field is a very close spin-off from the BeOS e.f.
|
|
The only differences are:
|
|
- a new extra field signature
|
|
- numeric field in the attributes data are stored in little-endian
|
|
format ("i386" was initial hardware for AtheOS)
|
|
(Last Revision 20040908)
|
|
|
|
Local-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(AtheOS) 0x7441 Short tag for this extra block type ("At")
|
|
TSize Short total data size for this block
|
|
BSize Long uncompressed file attribute data size
|
|
Flags Byte info bits
|
|
(CType) Short compression type
|
|
(CRC) Long CRC value for uncompressed file attribs
|
|
Attribs variable file attribute data
|
|
|
|
Central-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(AtheOS) 0x7441 Short tag for this extra block type ("At")
|
|
TSize Short total data size for this block (5)
|
|
BSize Long size of uncompr. local EF block data
|
|
Flags Byte info bits
|
|
|
|
The least significant bit of Flags in both headers indicates whether
|
|
the LOCAL extra field is uncompressed (and therefore whether CType
|
|
and CRC are omitted):
|
|
|
|
bit 0 if set, Attribs is uncompressed (no CType, CRC)
|
|
bits 1-7 reserved; if set, assume error or unknown data
|
|
|
|
Currently the only supported compression types are deflated (type 8)
|
|
and stored (type 0); the latter is not used by Info-ZIP's Zip but is
|
|
supported by UnZip.
|
|
|
|
Attribs is a AtheOS-specific block of data in little-endian format
|
|
with the following structure (if compressed, uncompress it first):
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
Name variable attribute name (null-terminated string)
|
|
Type Long attribute type (32-bit unsigned integer)
|
|
Size Long Long data size for this sub-block (64 bits)
|
|
Data variable attribute data
|
|
|
|
The attribute structure is repeated for every attribute. The Data
|
|
field may contain anything--text, flags, bitmaps, etc.
|
|
|
|
|
|
-SMS/QDOS Extra Field:
|
|
====================
|
|
|
|
The following is the layout of the file-attributes extra block for
|
|
SMS/QDOS. The local-header and central-header versions are identical.
|
|
(Last Revision 19960929)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(QDOS) 0xfb4a Short tag for this extra block type
|
|
TSize Short total data size for this block
|
|
LongID Long extra-field signature
|
|
(ExtraID) Long additional signature/flag bytes
|
|
QDirect 64 bytes qdirect structure
|
|
|
|
LongID may be "QZHD" or "QDOS". In the latter case, ExtraID will
|
|
be present. Its first three bytes are "02\0"; the last byte is
|
|
currently undefined.
|
|
|
|
QDirect contains the file's uncompressed directory info (qdirect
|
|
struct). Its elements are in native (big-endian) format:
|
|
|
|
d_length beLong file length
|
|
d_access byte file access type
|
|
d_type byte file type
|
|
d_datalen beLong data length
|
|
d_reserved beLong unused
|
|
d_szname beShort size of filename
|
|
d_name 36 bytes filename
|
|
d_update beLong time of last update
|
|
d_refdate beLong file version number
|
|
d_backup beLong time of last backup (archive date)
|
|
|
|
|
|
-AOS/VS Extra Field:
|
|
==================
|
|
|
|
The following is the layout of the extra block for Data General
|
|
AOS/VS. The local-header and central-header versions are identical.
|
|
(Last Revision 19961125)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(AOSVS) 0x5356 Short tag for this extra block type ("VS")
|
|
TSize Short total data size for this block
|
|
"FCI\0" Long extra-field signature
|
|
Version Byte version of AOS/VS extra block (10 = 1.0)
|
|
Fstat variable fstat packet
|
|
AclBuf variable raw ACL data ($MXACL bytes)
|
|
|
|
Fstat contains the file's uncompressed fstat packet, which is one of
|
|
the following:
|
|
|
|
normal fstat packet (P_FSTAT struct)
|
|
DIR/CPD fstat packet (P_FSTAT_DIR struct)
|
|
unit (device) fstat packet (P_FSTAT_UNIT struct)
|
|
IPC file fstat packet (P_FSTAT_IPC struct)
|
|
|
|
AclBuf contains the raw ACL data; its length is $MXACL.
|
|
|
|
|
|
-Tandem NSK Extra Field:
|
|
======================
|
|
|
|
The following is the layout of the file-attributes extra block for
|
|
Tandem NSK. The local-header and central-header versions are
|
|
identical. (Last Revision 19981221)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(TA) 0x4154 Short tag for this extra block type ("TA")
|
|
TSize Short total data size for this block (20)
|
|
NSKattrs 20 Bytes NSK attributes
|
|
|
|
|
|
-THEOS Extra Field:
|
|
=================
|
|
|
|
The following is the layout of the file-attributes extra block for
|
|
Theos. The local-header and central-header versions are identical.
|
|
(Last Revision 19990206)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(Theos) 0x6854 Short 'Th' signature
|
|
size Short size of extra block
|
|
flags Byte reserved for future use
|
|
filesize Long file size
|
|
fileorg Byte type of file (see below)
|
|
keylen Short key length for indexed and keyed files,
|
|
data segment size for 16 bits programs
|
|
reclen Short record length for indexed,keyed and direct,
|
|
text segment size for 16 bits programs
|
|
filegrow Byte growing factor for indexed,keyed and direct
|
|
protect Byte protections (see below)
|
|
reserved Short reserved for future use
|
|
|
|
File types
|
|
==========
|
|
|
|
0x80 library (keyed access list of files)
|
|
0x40 directory
|
|
0x10 stream file
|
|
0x08 direct file
|
|
0x04 keyed file
|
|
0x02 indexed file
|
|
0x0e reserved
|
|
0x01 16 bits real mode program (obsolete)
|
|
0x21 16 bits protected mode program
|
|
0x41 32 bits protected mode program
|
|
|
|
Protection codes
|
|
================
|
|
|
|
User protection
|
|
---------------
|
|
0x01 non readable
|
|
0x02 non writable
|
|
0x04 non executable
|
|
0x08 non erasable
|
|
|
|
Other protection
|
|
----------------
|
|
0x10 non readable
|
|
0x20 non writable
|
|
0x40 non executable Theos before 4.0
|
|
0x40 modified Theos 4.x
|
|
0x80 not hidden
|
|
|
|
|
|
-THEOS old inofficial Extra Field:
|
|
================================
|
|
|
|
The following is the layout of an inoffical former version of a
|
|
Theos file-attributes extra blocks. This layout was never published
|
|
and is no longer created. However, UnZip can optionally support it
|
|
when compiling with the option flag OLD_THEOS_EXTRA defined.
|
|
Both the local-header and central-header versions are identical.
|
|
(Last Revision 19990206)
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(THS0) 0x4854 Short 'TH' signature
|
|
size Short size of extra block
|
|
flags Short reserved for future use
|
|
filesize Long file size
|
|
reclen Short record length for indexed,keyed and direct,
|
|
text segment size for 16 bits programs
|
|
keylen Short key length for indexed and keyed files,
|
|
data segment size for 16 bits programs
|
|
filegrow Byte growing factor for indexed,keyed and direct
|
|
reserved 3 Bytes reserved for future use
|
|
|
|
|
|
-FWKCS MD5 Extra Field (0x4b46):
|
|
==============================
|
|
|
|
The FWKCS Contents_Signature System, used in automatically
|
|
identifying files independent of filename, optionally adds
|
|
and uses an extra field to support the rapid creation of
|
|
an enhanced contents_signature.
|
|
There is no local-header version; the following applies
|
|
only to the central header. (Last Revision 19961207)
|
|
|
|
Central-header version:
|
|
|
|
Value Size Description
|
|
----- ---- -----------
|
|
(MD5) 0x4b46 Short tag for this extra block type ("FK")
|
|
TSize Short total data size for this block (19)
|
|
"MD5" 3 bytes extra-field signature
|
|
MD5hash 16 bytes 128-bit MD5 hash of uncompressed data
|
|
(low byte first)
|
|
|
|
When FWKCS revises a .ZIP file central directory to add
|
|
this extra field for a file, it also replaces the
|
|
central directory entry for that file's uncompressed
|
|
file length with a measured value.
|
|
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FWKCS provides an option to strip this extra field, if
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present, from a .ZIP file central directory. In adding
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this extra field, FWKCS preserves .ZIP file Authenticity
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Verification; if stripping this extra field, FWKCS
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preserves all versions of AV through PKZIP version 2.04g.
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FWKCS, and FWKCS Contents_Signature System, are
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trademarks of Frederick W. Kantor.
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(1) R. Rivest, RFC1321.TXT, MIT Laboratory for Computer
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Science and RSA Data Security, Inc., April 1992.
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ll.76-77: "The MD5 algorithm is being placed in the
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public domain for review and possible adoption as a
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standard."
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-Microsoft Open Packaging Growth Hint (0xa220):
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=============================================
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Value Size Description
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----- ---- -----------
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0xa220 Short tag for this extra block type
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TSize Short size of Sig + PadVal + Padding
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Sig Short verification signature (A028)
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PadVal Short Initial padding value
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Padding variable filled with NULL characters
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