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# std.zip

Read and write data in the zip archive format.
Standards:
The current implementation mostly conforms to ISO/IEC 21320-1:2015, which means,

- that files can only be stored uncompressed or using the deflate mechanism,
- that encryption features are not used,
- that digital signature features are not used,
- that patched data features are not used, and
- that archives may not span multiple volumes.

Additionally, archives are checked for malware attacks and rejected if detected. This includes

- zip bombs which generate gigantic amounts of unpacked data
- zip archives that contain overlapping records
- chameleon zip archives which generate different unpacked data, depending on the implementation of the unpack algorithm

The current implementation makes use of the zlib compression library.

Usage There are two main ways of usage: Extracting files from a zip archive and storing files into a zip archive. These can be mixed though (e.g. read an archive, remove some files, add others and write the new archive).

Examples:
Example for reading an existing zip archive:

    import std.stdio : writeln, writefln;
    import std.file : read;
    import std.zip;

    void main(string[] args)
    {
        // read a zip file into memory
        auto zip = new ZipArchive(read(args[1]));

        // iterate over all zip members
        writefln("%-10s  %-8s  Name", "Length", "CRC-32");
        foreach (name, am; zip.directory)
        {
            // print some data about each member
            writefln("%10s  %08x  %s", am.expandedSize, am.crc32, name);
            assert(am.expandedData.length == 0);

            // decompress the archive member
            zip.expand(am);
            assert(am.expandedData.length == am.expandedSize);
        }
    }

Example for writing files into a zip archive:

    import std.file : write;
    import std.string : representation;
    import std.zip;

    void main()
    {
        // Create an ArchiveMembers for each file.
        ArchiveMember file1 = new ArchiveMember();
        file1.name = "test1.txt";
        file1.expandedData("Test data.\n".dup.representation);
        file1.compressionMethod = CompressionMethod.none; // don't compress

        ArchiveMember file2 = new ArchiveMember();
        file2.name = "test2.txt";
        file2.expandedData("More test data.\n".dup.representation);
        file2.compressionMethod = CompressionMethod.deflate; // compress

        // Create an archive and add the member.
        ZipArchive zip = new ZipArchive();

        // add ArchiveMembers
        zip.addMember(file1);
        zip.addMember(file2);

        // Build the archive
        void[] compressed_data = zip.build();

        // Write to a file
        write("test.zip", compressed_data);
    }

License:
Boost License 1.0.
Authors:
Walter Bright

Source std/zip.d

class `ZipException`: object.Exception;
  Thrown on error.
enum `CompressionMethod`: ushort;
  Compression method used by ArchiveMember.
  `none`
    No compression, just archiving.
  `deflate`
    Deflate algorithm. Use zlib library to compress.
class `ArchiveMember`;
  A single file or directory inside the archive.
  string `name`;
    The name of the archive member; it is used to index the archive directory for the member. Each member must have a unique name. Do not change without removing member from the directory first.
  ubyte[] `extra`;
    The content of the extra data field for this member. See original documentation for a description of the general format of this data. May contain undocumented 3rd-party data.
  string `comment`;
    Comment associated with this member.
  ushort `flags`;
    Contains some information on how to extract this archive. See original documentation for details.
  ushort `internalAttributes`;
    Internal attributes. Bit 1 is set, if the member is apparently in binary format and bit 2 is set, if each record is preceded by the length of the record.
  const pure nothrow @nogc @property @safe ushort `extractVersion`();
    The zip file format version needed to extract this member.
    Returns:
    Format version needed to extract this member.
  const pure nothrow @nogc @property @safe uint `crc32`();
    Cyclic redundancy check (CRC) value.
    Returns:
    CRC32 value.
  const pure nothrow @nogc @property @safe uint `compressedSize`();
    Size of data of member in compressed form.
    Returns:
    Size of the compressed archive.
  const pure nothrow @nogc @property @safe uint `expandedSize`();
    Size of data of member in uncompressed form.
    Returns:
    Size of uncompressed archive.
  pure nothrow @nogc @property @safe ubyte[] `compressedData`();
    Data of member in compressed form.
    Returns:
    The file data in compressed form.
  pure nothrow @nogc @property @safe ubyte[] `expandedData`();
  @property @safe void `expandedData`(ubyte[] `ed`);
    Get or set data of member in uncompressed form. When an existing archive is read ZipArchive.expand needs to be called before this can be accessed.
    Parameters:

    ubyte[] `ed` | Expanded Data.

    Returns:
    The file data.
  @property @safe void `fileAttributes`(uint `attr`);
  const nothrow @nogc @property uint `fileAttributes`();
    Get or set the OS specific file attributes for this archive member.
    Parameters:

    uint `attr` | Attributes as obtained by std.file.getAttributes or std.file.DirEntry.attributes.

    Returns:
    The file attributes or 0 if the file attributes were encoded for an incompatible OS (Windows vs. POSIX).
  const pure nothrow @nogc @property @safe DosFileTime `time`();
  @property void `time`(SysTime `time`);
  pure nothrow @nogc @property @safe void `time`(DosFileTime `time`);
    Get or set the last modification time for this member.
    Parameters:

    SysTime `time` | Time to set (will be saved as DosFileTime, which is less accurate).

    Returns:
    The last modification time in DosFileFormat.
  const pure nothrow @nogc @property @safe CompressionMethod `compressionMethod`();
  pure @property @safe void `compressionMethod`(CompressionMethod `cm`);
    Get or set compression method used for this member.
    Parameters:

    CompressionMethod `cm` | Compression method.

    Returns:
    Compression method.
    See Also:
    CompressionMethod
  pure nothrow @nogc @property @safe uint `index`(uint `value`);
  const pure nothrow @nogc @property @safe uint `index`();
    The index of this archive member within the archive. Set this to a different value for reordering the members of an archive.
    Parameters:

    uint `value` | Index value to set.

    Returns:
    The index.
class `ZipArchive`;
  Object representing the entire archive. ZipArchives are collections of ArchiveMembers.
  string `comment`;
    The archive comment. Must be less than 65536 bytes in length.
  pure nothrow @nogc @property @safe ubyte[] `data`();
    Array representing the entire contents of the archive.
    Returns:
    Data of the entire contents of the archive.
  const pure nothrow @nogc @property @safe uint `totalEntries`();
    Number of ArchiveMembers in the directory.
    Returns:
    The number of files in this archive.
  const pure nothrow @nogc @property @safe bool `isZip64`();
  pure nothrow @nogc @property @safe void `isZip64`(bool `value`);
    True when the archive is in Zip64 format. Set this to true to force building a Zip64 archive.
    Parameters:

    bool `value` | True, when the archive is forced to be build in Zip64 format.

    Returns:
    True, when the archive is in Zip64 format.
  pure nothrow @nogc @property @safe ArchiveMember[string] `directory`();
    Associative array indexed by the name of each member of the archive.
    All the members of the archive can be accessed with a foreach loop:

    Example

        ZipArchive archive = new ZipArchive(data);
        foreach (ArchiveMember am; archive.directory)
        {
            writefln("member name is '%s'", am.name);
        }

    Returns:
    Associative array with all archive members.
  pure nothrow @nogc @safe this();
    Constructor to use when creating a new archive.
  @safe void `addMember`(ArchiveMember `de`);
    Add a member to the archive. The file is compressed on the fly.
    Parameters:

    ArchiveMember `de` | Member to be added.

    Throws:
    ZipException when an unsupported compression method is used or when compression failed.
  @safe void `deleteMember`(ArchiveMember `de`);
    Delete member `de` from the archive. Uses the name of the member to detect which element to delete.
    Parameters:

    ArchiveMember `de` | Member to be deleted.

  pure @safe void[] `build`();
    Construct the entire contents of the current members of the archive.
    Fills in the properties data[], totalEntries, and directory[]. For each ArchiveMember, fills in properties crc32, compressedSize, compressedData[].
    Returns:
    Array representing the entire archive.
    Throws:
    ZipException when the archive could not be build.
  this(void[] `buffer`);
    Constructor to use when reading an existing archive.
    Fills in the properties data[], totalEntries, comment[], and directory[]. For each ArchiveMember, fills in properties madeVersion, extractVersion, flags, compressionMethod, time, crc32, compressedSize, expandedSize, compressedData[], internalAttributes, externalAttributes, name[], extra[], comment[]. Use expand() to get the expanded data for each ArchiveMember.
    Parameters:

    void[] `buffer` | The entire contents of the archive.

    Throws:
    ZipException when the archive was invalid or when malware was detected.
  ubyte[] `expand`(ArchiveMember `de`);
    Decompress the contents of a member.
    Fills in properties extractVersion, flags, compressionMethod, time, crc32, compressedSize, expandedSize, expandedData[], name[], extra[].
    Parameters:

    ArchiveMember `de` | Member to be decompressed.

    Returns:
    The expanded data.
    Throws:
    ZipException when the entry is invalid or the compression method is not supported.

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