gecko-dev/modules/libjar/nsIZipReader.idl

/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

%{C++
struct PRFileDesc;
%}

[ptr] native PRFileDescStar(PRFileDesc);

interface nsIUTF8StringEnumerator;
interface nsIInputStream;
interface nsIFile;

[scriptable, uuid(fad6f72f-13d8-4e26-9173-53007a4afe71)]
interface nsIZipEntry : nsISupports
{
    /**
     * The type of compression used for the item.  The possible values and
     * their meanings are defined in the zip file specification at
     * http://www.pkware.com/business_and_developers/developer/appnote/
     */
    readonly attribute unsigned short   compression;
    /**
     * The compressed size of the data in the item.
     */
    readonly attribute unsigned long    size;
    /**
     * The uncompressed size of the data in the item.
     */
    readonly attribute unsigned long    realSize;
    /**
     * The CRC-32 hash of the file in the entry.
     */
    readonly attribute unsigned long    CRC32;
    /**
     * True if the name of the entry ends with '/' and false otherwise.
     */
    readonly attribute boolean          isDirectory;
    /**
     * The time at which this item was last modified.
     */
    readonly attribute PRTime           lastModifiedTime;
    /**
     * Use this attribute to determine whether this item is an actual zip entry
     * or is one synthesized for part of a real entry's path.  A synthesized
     * entry represents a directory within the zip file which has no
     * corresponding entry within the zip file.  For example, the entry for the
     * directory foo/ in a zip containing exactly one entry for foo/bar.txt
     * is synthetic.  If the zip file contains an actual entry for a directory,
     * this attribute will be false for the nsIZipEntry for that directory.
     * It is impossible for a file to be synthetic.
     */
    readonly attribute boolean          isSynthetic;
    /**
     * The UNIX style file permissions of this item.
     */
    readonly attribute unsigned long    permissions;
};

[scriptable, uuid(9ba4ef54-e0a0-4f65-9d23-128482448885)]
interface nsIZipReader : nsISupports
{
    /**
     * Opens a zip file for reading.
     * It is allowed to open with another file, 
     * but it needs to be closed first with close().
     */
    void open(in nsIFile zipFile);

    /**
     * Opens a zip file inside a zip file for reading.
     */
    void openInner(in nsIZipReader zipReader, in AUTF8String zipEntry);

    /**
     * Opens a zip file stored in memory; the file attribute will be null.
     *
     * The ZipReader does not copy or take ownership of this memory; the
     * caller must ensure that it is valid and unmodified until the
     * ZipReader is closed or destroyed, and must free the memory as
     * appropriate afterwards.
     */
    void openMemory(in voidPtr aData, in unsigned long aLength);

    /**
     * The file that represents the zip with which this zip reader was
     * initialized.  This will be null if there is no underlying file.
     */
    readonly attribute nsIFile file;

    /**
     * Closes a zip reader. Subsequent attempts to extract files or read from
     * its input stream will result in an error.
     *
     * Subsequent attempts to access a nsIZipEntry obtained from this zip
     * reader will cause unspecified behavior.
     */
    void close();

    /**
     * Tests the integrity of the archive by performing a CRC check 
     * on each item expanded into memory.  If an entry is specified
     * the integrity of only that item is tested.  If null (javascript)
     * or EmptyCString() (c++) is passed in the integrity of all items 
     * in the archive are tested.  
     */
    void test(in AUTF8String aEntryName);

    /**
     * Extracts a zip entry into a local file specified by outFile.
     * The entry must be stored in the zip in either uncompressed or
     * DEFLATE-compressed format for the extraction to be successful.
     * If the entry is a directory, the directory will be extracted
     * non-recursively.
     */
    void extract(in AUTF8String zipEntry, in nsIFile outFile);

    /**
     * Returns a nsIZipEntry describing a specified zip entry.
     */
    nsIZipEntry getEntry(in AUTF8String zipEntry);

    /**
     * Checks whether the zipfile contains an entry specified by entryName.
     */
    boolean hasEntry(in AUTF8String zipEntry);
 
    /**
     * Returns a string enumerator containing the matching entry names.
     *
     * @param aPattern
     *   A regular expression used to find matching entries in the zip file.
     *   Set this parameter to null (javascript) or EmptyCString() (c++) or "*" 
     *   to get all entries; otherwise, use the
     *   following syntax:
     *
     *   o * matches anything
     *   o ? matches one character
     *   o $ matches the end of the string
     *   o [abc] matches one occurrence of a, b, or c. The only character that
     *           must be escaped inside the brackets is ].  ^ and - must never
     *           appear in the first and second positions within the brackets, 
     *           respectively.  (In the former case, the behavior specified for
     *           '[^az]' will happen.)
     *   o [a-z] matches any character between a and z.  The characters a and z
     *           must either both be letters or both be numbers, with the
     *           character represented by 'a' having a lower ASCII value than
     *           the character represented by 'z'.
     *   o [^az] matches any character except a or z.  If ] is to appear inside
     *           the brackets as a character to not match, it must be escaped.
     *   o pat~pat2 returns matches to the pattern 'pat' which do not also match
     *              the pattern 'pat2'.  This may be used to perform filtering
     *              upon the results of one pattern to remove all matches which
     *              also match another pattern.  For example, because '*'
     *              matches any string and '*z*' matches any string containing a
     *              'z', '*~*z*' will match all strings except those containing
     *              a 'z'.  Note that a pattern may not use '~' multiple times,
     *              so a string such as '*~*z*~*y*' is not a valid pattern.
     *   o (foo|bar) will match either the pattern foo or the pattern bar.
     *               Neither of the patterns foo or bar may use the 'pat~pat2'
     *               syntax described immediately above.
     *   o \ will escape a special character.  Escaping is required for all
     *       special characters unless otherwise specified.
     *   o All other characters match case-sensitively.
     *
     *   An aPattern not conforming to this syntax has undefined behavior.
     *
     * @throws NS_ERROR_ILLEGAL_VALUE on many but not all invalid aPattern
     *                                values.
     */
    nsIUTF8StringEnumerator findEntries(in AUTF8String aPattern);

    /**
     * Returns an input stream containing the contents of the specified zip
     * entry.
     * @param zipEntry the name of the entry to open the stream from
     */
    nsIInputStream getInputStream(in AUTF8String zipEntry);

    /**
     * Returns an input stream containing the contents of the specified zip
     * entry. If the entry refers to a directory (ends with '/'), a directory stream 
     * is opened, otherwise the contents of the file entry is returned.
     * @param aJarSpec the Spec of the URI for the JAR (only used for directory streams)
     * @param zipEntry the name of the entry to open the stream from
     */
    nsIInputStream getInputStreamWithSpec(in AUTF8String aJarSpec, in AUTF8String zipEntry);
};

////////////////////////////////////////////////////////////////////////////////
// nsIZipReaderCache

[scriptable, uuid(31179807-9fcd-46c4-befa-2ade209a394b)]
interface nsIZipReaderCache : nsISupports
{
    /**
     * Initializes a new zip reader cache. 
     * @param cacheSize - the number of released entries to maintain before
     *   beginning to throw some out (note that the number of outstanding
     *   entries can be much greater than this number -- this is the count
     *   for those otherwise unused entries)
     */
    void init(in unsigned long cacheSize);

    /**
     * Returns a (possibly shared) nsIZipReader for an nsIFile.
     *
     * If the zip reader for given file is not in the cache, a new zip reader
     * is created, initialized, and opened (see nsIZipReader::init and 
     * nsIZipReader::open). Otherwise the previously created zip reader is 
     * returned.
     *
     * @note If someone called close() on the shared nsIZipReader, this method 
     *       will return the closed zip reader.
     */
    nsIZipReader getZip(in nsIFile zipFile);

    /**
     * Like getZip(), returns a (possibly shared) nsIZipReader for an nsIFile,
     * but if a zip reader for the given file is not in the cache, returns
     * error NS_ERROR_CACHE_KEY_NOT_FOUND rather than creating a new reader.
     *
     * @note If someone called close() on the shared nsIZipReader, this method
     *       will return the closed zip reader.
     */
    nsIZipReader getZipIfCached(in nsIFile zipFile);

    /**
     * returns true if this zipreader already has this file cached
     */
    bool isCached(in nsIFile zipFile);

    /**
     * Returns a (possibly shared) nsIZipReader for a zip inside another zip
     *
     * See getZip
     */
    nsIZipReader getInnerZip(in nsIFile zipFile, in AUTF8String zipEntry);

    /**
     * Returns the cached NSPR file descriptor of the file.
     * Note: currently not supported on Windows platform.
     */
    PRFileDescStar getFd(in nsIFile zipFile);
};

////////////////////////////////////////////////////////////////////////////////

%{C++

#define NS_ZIPREADER_CID                             \
{ /* 88e2fd0b-f7f4-480c-9483-7846b00e8dad */         \
   0x88e2fd0b, 0xf7f4, 0x480c,                       \
  { 0x94, 0x83, 0x78, 0x46, 0xb0, 0x0e, 0x8d, 0xad } \
}

#define NS_ZIPREADERCACHE_CID                        \
{ /* 608b7f6f-4b60-40d6-87ed-d933bf53d8c1 */         \
   0x608b7f6f, 0x4b60, 0x40d6,                       \
  { 0x87, 0xed, 0xd9, 0x33, 0xbf, 0x53, 0xd8, 0xc1 } \
}

%}

////////////////////////////////////////////////////////////////////////////////