JUCE/modules/juce_core/zip/juce_ZipFile.h

/*
  ==============================================================================

   This file is part of the juce_core module of the JUCE library.
   Copyright (c) 2015 - ROLI Ltd.

   Permission to use, copy, modify, and/or distribute this software for any purpose with
   or without fee is hereby granted, provided that the above copyright notice and this
   permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
   TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
   NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
   DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
   IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
   CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ------------------------------------------------------------------------------

   NOTE! This permissive ISC license applies ONLY to files within the juce_core module!
   All other JUCE modules are covered by a dual GPL/commercial license, so if you are
   using any other modules, be sure to check that you also comply with their license.

   For more details, visit www.juce.com

  ==============================================================================
*/

#ifndef JUCE_ZIPFILE_H_INCLUDED
#define JUCE_ZIPFILE_H_INCLUDED


//==============================================================================
/**
    Decodes a ZIP file from a stream.

    This can enumerate the items in a ZIP file and can create suitable stream objects
    to read each one.
*/
class JUCE_API  ZipFile
{
public:
    /** Creates a ZipFile to read a specific file. */
    explicit ZipFile (const File& file);

    //==============================================================================
    /** Creates a ZipFile for a given stream.

        @param inputStream                  the stream to read from
        @param deleteStreamWhenDestroyed    if set to true, the object passed-in
                                            will be deleted when this ZipFile object is deleted
    */
    ZipFile (InputStream* inputStream, bool deleteStreamWhenDestroyed);

    /** Creates a ZipFile for a given stream.
        The stream will not be owned or deleted by this class - if you want the ZipFile to
        manage the stream's lifetime, use the other constructor.
    */
    explicit ZipFile (InputStream& inputStream);

    /** Creates a ZipFile for an input source.

        The inputSource object will be owned by the zip file, which will delete
        it later when not needed.
    */
    explicit ZipFile (InputSource* inputSource);

    /** Destructor. */
    ~ZipFile();

    //==============================================================================
    /**
        Contains information about one of the entries in a ZipFile.

        @see ZipFile::getEntry
    */
    struct ZipEntry
    {
        /** The name of the file, which may also include a partial pathname. */
        String filename;

        /** The file's original size. */
        unsigned int uncompressedSize;

        /** The last time the file was modified. */
        Time fileTime;
    };

    //==============================================================================
    /** Returns the number of items in the zip file. */
    int getNumEntries() const noexcept;

    /** Returns a structure that describes one of the entries in the zip file.
        This may return zero if the index is out of range.
        @see ZipFile::ZipEntry
    */
    const ZipEntry* getEntry (int index) const noexcept;

    /** Returns the index of the first entry with a given filename.
        This uses a case-sensitive comparison to look for a filename in the
        list of entries. It might return -1 if no match is found.

        @see ZipFile::ZipEntry
    */
    int getIndexOfFileName (const String& fileName) const noexcept;

    /** Returns a structure that describes one of the entries in the zip file.

        This uses a case-sensitive comparison to look for a filename in the
        list of entries. It might return 0 if no match is found.

        @see ZipFile::ZipEntry
    */
    const ZipEntry* getEntry (const String& fileName) const noexcept;

    /** Sorts the list of entries, based on the filename. */
    void sortEntriesByFilename();

    //==============================================================================
    /** Creates a stream that can read from one of the zip file's entries.

        The stream that is returned must be deleted by the caller (and
        zero might be returned if a stream can't be opened for some reason).

        The stream must not be used after the ZipFile object that created
        has been deleted.

        Note that if the ZipFile was created with a user-supplied InputStream object,
        then all the streams which are created by this method will by trying to share
        the same source stream, so cannot be safely used on  multiple threads! (But if
        you create the ZipFile from a File or InputSource, then it is safe to do this).
    */
    InputStream* createStreamForEntry (int index);

    /** Creates a stream that can read from one of the zip file's entries.

        The stream that is returned must be deleted by the caller (and
        zero might be returned if a stream can't be opened for some reason).

        The stream must not be used after the ZipFile object that created
        has been deleted.

        Note that if the ZipFile was created with a user-supplied InputStream object,
        then all the streams which are created by this method will by trying to share
        the same source stream, so cannot be safely used on  multiple threads! (But if
        you create the ZipFile from a File or InputSource, then it is safe to do this).
    */
    InputStream* createStreamForEntry (const ZipEntry& entry);

    //==============================================================================
    /** Uncompresses all of the files in the zip file.

        This will expand all the entries into a target directory. The relative
        paths of the entries are used.

        @param targetDirectory      the root folder to uncompress to
        @param shouldOverwriteFiles whether to overwrite existing files with similarly-named ones
        @returns success if the file is successfully unzipped
    */
    Result uncompressTo (const File& targetDirectory,
                         bool shouldOverwriteFiles = true);

    /** Uncompresses one of the entries from the zip file.

        This will expand the entry and write it in a target directory. The entry's path is used to
        determine which subfolder of the target should contain the new file.

        @param index                the index of the entry to uncompress - this must be a valid index
                                    between 0 and (getNumEntries() - 1).
        @param targetDirectory      the root folder to uncompress into
        @param shouldOverwriteFiles whether to overwrite existing files with similarly-named ones
        @returns success if all the files are successfully unzipped
    */
    Result uncompressEntry (int index,
                            const File& targetDirectory,
                            bool shouldOverwriteFiles = true);


    //==============================================================================
    /** Used to create a new zip file.

        Create a ZipFile::Builder object, and call its addFile() method to add some files,
        then you can write it to a stream with write().

        Currently this just stores the files with no compression.. That will be added
        soon!
    */
    class Builder
    {
    public:
        Builder();
        ~Builder();

        /** Adds a file while should be added to the archive.
            The file isn't read immediately, all the files will be read later when the writeToStream()
            method is called.

            The compressionLevel can be between 0 (no compression), and 9 (maximum compression).
            If the storedPathName parameter is specified, you can customise the partial pathname that
            will be stored for this file.
        */
        void addFile (const File& fileToAdd, int compressionLevel,
                      const String& storedPathName = String());

        /** Adds a file while should be added to the archive.

            @param streamToRead this stream isn't read immediately - a pointer to the stream is
                                stored, then used later when the writeToStream() method is called, and
                                deleted by the Builder object when no longer needed, so be very careful
                                about its lifetime and the lifetime of any objects on which it depends!
                                This must not be null.
            @param compressionLevel     this can be between 0 (no compression), and 9 (maximum compression).
            @param storedPathName       the partial pathname that will be stored for this file
            @param fileModificationTime the timestamp that will be stored as the last modification time
                                        of this entry
        */
        void addEntry (InputStream* streamToRead, int compressionLevel,
                       const String& storedPathName, Time fileModificationTime);

        /** Generates the zip file, writing it to the specified stream.
            If the progress parameter is non-null, it will be updated with an approximate
            progress status between 0 and 1.0
        */
        bool writeToStream (OutputStream& target, double* progress) const;

        //==============================================================================
    private:
        class Item;
        friend struct ContainerDeletePolicy<Item>;
        OwnedArray<Item> items;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (Builder)
    };

private:
    //==============================================================================
    class ZipInputStream;
    class ZipEntryHolder;
    friend class ZipInputStream;
    friend class ZipEntryHolder;

    OwnedArray<ZipEntryHolder> entries;
    CriticalSection lock;
    InputStream* inputStream;
    ScopedPointer<InputStream> streamToDelete;
    ScopedPointer<InputSource> inputSource;

   #if JUCE_DEBUG
    struct OpenStreamCounter
    {
        OpenStreamCounter() : numOpenStreams (0) {}
        ~OpenStreamCounter();

        int numOpenStreams;
    };

    OpenStreamCounter streamCounter;
   #endif

    void init();

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (ZipFile)
};

#endif   // JUCE_ZIPFILE_H_INCLUDED