- #INSPECT ZIP FILES FOR SAFETY BEFORE OPENING MAC ZIP FILE#
- #INSPECT ZIP FILES FOR SAFETY BEFORE OPENING MAC ARCHIVE#
If bit 3 (0x08) of the general-purpose flags field is set, then the CRC-32 and file sizes are not known when the header is written.
This is indicated in an entry by the General Purpose Flag bit 3 being set. There is one exception where it can not work however, and this is if the file does not contain enough information in the local entry headers to extract an entry.
#INSPECT ZIP FILES FOR SAFETY BEFORE OPENING MAC ZIP FILE#
Zip::InputStream can be used for faster reading of zip file content because it does not read the Central directory up front. first raise 'File too large when extracted' if entry.
read end # Find specific entry entry = zip_file. extract # Read into memory content = entry.
#INSPECT ZIP FILES FOR SAFETY BEFORE OPENING MAC ARCHIVE#
size > MAX_SIZE # Extract to file or directory based on name in the archive entry. Puts "Extracting #" raise 'File too large when extracted' if entry. MAX_SIZE = 1024** 2 # 1MiB (but of course you can increase this) Zip:: File. To save zip archives with their entries sorted by name (see below), set ::Zip.sort_entries to true add ( zipfile_path, disk_file_path ) end end Save zip archive entries sorted by name entries ( disk_file_path ) - %w write_entries subdir, zipfile_path, zipfile end def put_into_archive ( disk_file_path, zipfile, zipfile_path ) zipfile. directory? disk_file_path recursively_deflate_directory ( disk_file_path, zipfile, zipfile_path ) else put_into_archive ( disk_file_path, zipfile, zipfile_path ) end end end def recursively_deflate_directory ( disk_file_path, zipfile, zipfile_path ) zipfile. def write_entries ( entries, path, zipfile ) entries. Write_entries entries, '', zipfile end end private # A helper method to make the recursion work. def initialize ( input_dir, output_file ) = input_dir = output_file end # Zip the input directory. # Usage: # directory_to_zip = "/tmp/input" # output_file = "/tmp/out.zip" # zf = ZipFileGenerator.new(directory_to_zip, output_file) # zf.write() class ZipFileGenerator # Initialize with the directory to zip and the location of the output archive. The directory itself is not # included in the archive, rather just its contents. Require 'zip' # This is a simple example which uses rubyzip to # recursively generate a zip file from the contents of # a specified directory.
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