org.apache.commons.compress.archivers.sevenz

Class SevenZFile

  • All Implemented Interfaces:
    Closeable, AutoCloseable


    public class SevenZFileextends Objectimplements Closeable
    Reads a 7z file, using RandomAccessFile under the covers.

    The 7z file format is a flexible container that can contain many compression and encryption types, but at the moment only only Copy, LZMA, LZMA2, BZIP2, Deflate and AES-256 + SHA-256 are supported.

    The format is very Windows/Intel specific, so it uses little-endian byte order, doesn't store user/group or permission bits, and represents times using NTFS timestamps (100 nanosecond units since 1 January 1601). Hence the official tools recommend against using it for backup purposes on *nix, and recommend .tar.7z or .tar.lzma or .tar.xz instead.

    Both the header and file contents may be compressed and/or encrypted. With both encrypted, neither file names nor file contents can be read, but the use of encryption isn't plausibly deniable.

    Since:
    1.6
    This class is not thread-safe
    • Constructor Detail

      • SevenZFile

        public SevenZFile(File filename,          byte[] password)           throws IOException
        Reads a file as 7z archive
        Parameters:
        filename - the file to read
        password - optional password if the archive is encrypted - the byte array is supposed to be the UTF16-LE encoded representation of the password.
        Throws:
        IOException - if reading the archive fails
      • SevenZFile

        public SevenZFile(File filename)           throws IOException
        Reads a file as unecrypted 7z archive
        Parameters:
        filename - the file to read
        Throws:
        IOException - if reading the archive fails
    • Method Detail

      • getEntries

        public Iterable<SevenZArchiveEntrygetEntries()
        Returns meta-data of all archive entries.

        This method only provides meta-data, the entries can not be used to read the contents, you still need to process all entries in order using getNextEntry() for that.

        The content methods are only available for entries that have already been reached via getNextEntry().

        Returns:
        meta-data of all archive entries.
        Since:
        1.11
      • read

        public int read()         throws IOException
        Reads a byte of data.
        Returns:
        the byte read, or -1 if end of input is reached
        Throws:
        IOException - if an I/O error has occurred
      • read

        public int read(byte[] b)         throws IOException
        Reads data into an array of bytes.
        Parameters:
        b - the array to write data to
        Returns:
        the number of bytes read, or -1 if end of input is reached
        Throws:
        IOException - if an I/O error has occurred
      • read

        public int read(byte[] b,       int off,       int len)         throws IOException
        Reads data into an array of bytes.
        Parameters:
        b - the array to write data to
        off - offset into the buffer to start filling at
        len - of bytes to read
        Returns:
        the number of bytes read, or -1 if end of input is reached
        Throws:
        IOException - if an I/O error has occurred
      • matches

        public static boolean matches(byte[] signature,              int length)
        Checks if the signature matches what is expected for a 7z file.
        Parameters:
        signature - the bytes to check
        length - the number of bytes to check
        Returns:
        true, if this is the signature of a 7z archive.
        Since:
        1.8

Copyright © 2016 The Apache Software Foundation. All rights reserved.



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