Class: Zip::ZipEntry

Inherits:
Object show all
Defined in:
lib/javaclass/gems/zip_file.rb

Overview

:nodoc:all

Instance Method Summary collapse

Instance Method Details

#read_c_dir_entry(io) ⇒ Object 



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# File 'lib/javaclass/gems/zip_file.rb', line 16

def read_c_dir_entry(io)  
  staticSizedFieldsBuf = io.read(CDIR_ENTRY_STATIC_HEADER_LENGTH)
  unless (staticSizedFieldsBuf.size == CDIR_ENTRY_STATIC_HEADER_LENGTH)
    raise ZipError, "Premature end of file. Not enough data for zip cdir entry header"
  end

  @header_signature      ,
  @version               , # version of encoding software
  @fstype                , # filesystem type
  @versionNeededToExtract,
  @gp_flags              ,
  @compression_method    ,
  lastModTime            ,
  lastModDate            ,
  @crc                   ,
  @compressed_size       ,
  @size                  ,
  nameLength             ,
  extraLength            ,
  commentLength          ,
  diskNumberStart        ,
  @internalFileAttributes,
  @externalFileAttributes,
  @localHeaderOffset     ,
  @name                  ,
  @extra                 ,
  @comment               = staticSizedFieldsBuf.unpack('VCCvvvvvVVVvvvvvVV')

  unless @header_signature == CENTRAL_DIRECTORY_ENTRY_SIGNATURE
    raise ZipError, "Zip local header magic not found at location '#{localHeaderOffset}'"
  end
  set_time(lastModDate, lastModTime)

  @name = io.read(nameLength)
  if ZipExtraField === @extra
    @extra.merge(io.read(extraLength))
  else
    @extra = ZipExtraField.new(io.read(extraLength))
  end
  @comment = io.read(commentLength)
  unless (@comment && @comment.length == commentLength)
    raise ZipError, "Truncated cdir zip entry header"
  end

  case @fstype
    when FSTYPE_UNIX
      @unix_perms = (@externalFileAttributes >> 16) & 07777
  
      case (@externalFileAttributes >> 28)
      when 04
        @ftype = :directory
      when 010
        @ftype = :file
      when 012
        @ftype = :link
      else
        # raise ZipInternalError, "unknown file type #{'0%o' % (@externalFileAttributes >> 28)}"
        
        # PKZIP format see http://www.pkware.com/documents/APPNOTE/APPNOTE-6.3.0.TXT
        # external file attributes: (4 bytes)
        # The mapping of the external attributes is host-system dependent (see 'version made by').
        # For MS-DOS, the low order byte is the MS-DOS directory attribute byte. If input came 
        # from standard input, this field is set to zero.
        # for the meaning of these flags see http://unix.stackexchange.com/questions/14705/the-zip-formats-external-file-attribute

        # unknown flag, fall back to name detection
        if name_is_directory?
          @ftype = :directory
        else
          @ftype = :file
        end
        
      end
      
    else
      if name_is_directory?
        @ftype = :directory
      else
        @ftype = :file
      end
    end
end

#strict_read_c_dir_entry ⇒ Object

uncomment next method to avoid swallowing errors, else we get nil entries later. def ZipEntry.read_c_dir_entry(io)

entry = new(io.path)
entry.read_c_dir_entry(io)
return entry

end



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# File 'lib/javaclass/gems/zip_file.rb', line 14

alias :strict_read_c_dir_entry read_c_dir_entry