181 lines
3.0 KiB
Ruby
181 lines
3.0 KiB
Ruby
# -*- coding: binary -*-
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module Rex
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module Zip
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#
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# This structure holds the following data pertaining to a Zip entry's data.
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#
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# data crc
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# compressed size
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# uncompressed size
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#
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class CompInfo
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def initialize(crc, compsz, uncompsz)
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@crc, @compsz, @uncompsz = crc, compsz, uncompsz
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end
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def pack
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[ @crc, @compsz, @uncompsz ].pack('VVV')
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end
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end
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#
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# This structure holds the following data pertaining to a Zip entry.
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#
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# general purpose bit flag
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# compression method
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# modification time
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# modification date
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#
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class CompFlags
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attr_accessor :compmeth
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def initialize(gpbf, compmeth, timestamp)
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@gpbf = gpbf
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@compmeth = compmeth
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@mod_time = ((timestamp.hour << 11) | (timestamp.min << 5) | (timestamp.sec))
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@mod_date = (((timestamp.year - 1980) << 9) | (timestamp.mon << 5) | (timestamp.day))
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end
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def pack
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[ @gpbf, @compmeth, @mod_time, @mod_date ].pack('vvvv')
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end
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end
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#
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# This structure is sometimes stored after the file data and used
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# instead of the fields within the Local File Header.
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#
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class DataDesc
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SIGNATURE = 0x8074b50
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def initialize(compinfo)
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@compinfo = compinfo
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end
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def pack
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ret = [ SIGNATURE ].pack('V')
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ret << @compinfo.pack
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ret
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end
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end
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#
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# This structure records the compression data and flags about
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# a Zip entry to a file.
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#
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class LocalFileHdr
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SIGNATURE = 0x4034b50
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def initialize(entry)
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@entry = entry
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end
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def pack
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path = @entry.relative_path
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ret = [ SIGNATURE, ZIP_VERSION ].pack('Vv')
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ret << @entry.flags.pack
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ret << @entry.info.pack
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ret << [ path.length, @entry.xtra.length ].pack('vv')
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ret << path
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ret << @entry.xtra
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ret
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end
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end
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#
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# This structure holds all of the information about a particular Zip Entry
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# as it is contained within the central directory.
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#
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class CentralDir
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SIGNATURE = 0x2014b50
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def initialize(entry, offset)
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@entry = entry
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@disknum_start = 0
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@attr_int = 0
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@attr_ext = 0x20
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@hdr_offset = offset
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end
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def pack
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path = @entry.relative_path
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ret = [ SIGNATURE, ZIP_VERSION ].pack('Vv')
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ret << [ ZIP_VERSION ].pack('v')
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ret << @entry.flags.pack
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ret << @entry.info.pack
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arr = []
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arr << path.length
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arr << @entry.xtra.length
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arr << @entry.comment.length
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arr << @disknum_start
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arr << @attr_int
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arr << @entry.attrs
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arr << @hdr_offset
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ret << arr.pack('vvvvvVV')
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ret << path
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ret << @entry.xtra
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ret << @entry.comment
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# digital signature not supported
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ret
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end
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end
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#
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# This structure is written after the per-entry central directory records to
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# provide information about the archive as a whole.
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#
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class CentralDirEnd
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SIGNATURE = 0x6054b50
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def initialize(ncfd, cfdsz, offset, comment=nil)
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@disk_no = 0
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@disk_dir_start = 0
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@ncfd_this_disk = ncfd
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@ncfd_total = ncfd
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@cfd_size = cfdsz
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@start_offset = offset
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@comment = comment
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@comment ||= ''
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end
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def pack
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arr = []
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arr << SIGNATURE
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arr << @disk_no
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arr << @disk_dir_start
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arr << @ncfd_this_disk
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arr << @ncfd_total
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arr << @cfd_size
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arr << @start_offset
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arr << @comment.length
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(arr.pack('VvvvvVVv') + @comment)
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end
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end
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end
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end
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