axmol/cocos/2d/platform/CCFileUtils.h

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Copyright (c) 2010-2013 cocos2d-x.org
Copyright (c) 2013-2014 Chukong Technologies Inc.

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#ifndef __CC_FILEUTILS_H__
#define __CC_FILEUTILS_H__

#include <string>
#include <vector>
#include <unordered_map>
#include "CCPlatformMacros.h"
#include "ccTypes.h"
#include "CCValue.h"
#include "CCData.h"

NS_CC_BEGIN

/**
 * @addtogroup platform
 * @{
 */

//! @brief  Helper class to handle file operations
class CC_DLL FileUtils
{
public:
    /**
     *  Gets the instance of FileUtils.
     */
    static FileUtils* getInstance();

    /**
     *  Destroys the instance of FileUtils.
     */
    static void destroyInstance();

    /** @deprecated Use getInstance() instead */
    CC_DEPRECATED_ATTRIBUTE static FileUtils* sharedFileUtils() { return getInstance(); }

    /** @deprecated Use destroyInstance() instead */
    CC_DEPRECATED_ATTRIBUTE static void purgeFileUtils() { destroyInstance(); }

    /**
     *  The destructor of FileUtils.
     * @js NA
     * @lua NA
     */
    virtual ~FileUtils();
    
    /**
     *  Purges the file searching cache.
     *
     *  @note It should be invoked after the resources were updated.
     *        For instance, in the CocosPlayer sample, every time you run application from CocosBuilder,
     *        All the resources will be downloaded to the writable folder, before new js app launchs,
     *        this method should be invoked to clean the file search cache.
     */
    virtual void purgeCachedEntries();
    
    /**
     *  Gets string from a file.
     */
    virtual std::string getStringFromFile(const std::string& filename);
    
    /**
     *  Creates binary data from a file.
     *  @return A data object.
     */
    virtual Data getDataFromFile(const std::string& filename);
    
    /**
     *  Gets resource file data
     *
     *  @param[in]  filename The resource file name which contains the path.
     *  @param[in]  pszMode The read mode of the file.
     *  @param[out] pSize If the file read operation succeeds, it will be the data size, otherwise 0.
     *  @return Upon success, a pointer to the data is returned, otherwise NULL.
     *  @warning Recall: you are responsible for calling free() on any Non-NULL pointer returned.
     */
    CC_DEPRECATED_ATTRIBUTE virtual unsigned char* getFileData(const std::string& filename, const char* mode, ssize_t *size);

    /**
     *  Gets resource file data from a zip file.
     *
     *  @param[in]  filename The resource file name which contains the relative path of the zip file.
     *  @param[out] size If the file read operation succeeds, it will be the data size, otherwise 0.
     *  @return Upon success, a pointer to the data is returned, otherwise nullptr.
     *  @warning Recall: you are responsible for calling free() on any Non-nullptr pointer returned.
     */
    virtual unsigned char* getFileDataFromZip(const std::string& zipFilePath, const std::string& filename, ssize_t *size);

    
    /** Returns the fullpath for a given filename.
     
     First it will try to get a new filename from the "filenameLookup" dictionary.
     If a new filename can't be found on the dictionary, it will use the original filename.
     Then it will try to obtain the full path of the filename using the FileUtils search rules: resolutions, and search paths.
     The file search is based on the array element order of search paths and resolution directories.
     
     For instance:

     	We set two elements("/mnt/sdcard/", "internal_dir/") to search paths vector by setSearchPaths,
     	and set three elements("resources-ipadhd/", "resources-ipad/", "resources-iphonehd")
     	to resolutions vector by setSearchResolutionsOrder. The "internal_dir" is relative to "Resources/".

		If we have a file named 'sprite.png', the mapping in fileLookup dictionary contains `key: sprite.png -> value: sprite.pvr.gz`.
     	Firstly, it will replace 'sprite.png' with 'sprite.pvr.gz', then searching the file sprite.pvr.gz as follows:

     	    /mnt/sdcard/resources-ipadhd/sprite.pvr.gz      (if not found, search next)
     	    /mnt/sdcard/resources-ipad/sprite.pvr.gz        (if not found, search next)
     	    /mnt/sdcard/resources-iphonehd/sprite.pvr.gz    (if not found, search next)
     	    /mnt/sdcard/sprite.pvr.gz                       (if not found, search next)
     	    internal_dir/resources-ipadhd/sprite.pvr.gz     (if not found, search next)
     	    internal_dir/resources-ipad/sprite.pvr.gz       (if not found, search next)
     	    internal_dir/resources-iphonehd/sprite.pvr.gz   (if not found, search next)
     	    internal_dir/sprite.pvr.gz                      (if not found, return "sprite.png")

        If the filename contains relative path like "gamescene/uilayer/sprite.png",
        and the mapping in fileLookup dictionary contains `key: gamescene/uilayer/sprite.png -> value: gamescene/uilayer/sprite.pvr.gz`.
        The file search order will be:

     	    /mnt/sdcard/gamescene/uilayer/resources-ipadhd/sprite.pvr.gz      (if not found, search next)
     	    /mnt/sdcard/gamescene/uilayer/resources-ipad/sprite.pvr.gz        (if not found, search next)
     	    /mnt/sdcard/gamescene/uilayer/resources-iphonehd/sprite.pvr.gz    (if not found, search next)
     	    /mnt/sdcard/gamescene/uilayer/sprite.pvr.gz                       (if not found, search next)
     	    internal_dir/gamescene/uilayer/resources-ipadhd/sprite.pvr.gz     (if not found, search next)
     	    internal_dir/gamescene/uilayer/resources-ipad/sprite.pvr.gz       (if not found, search next)
     	    internal_dir/gamescene/uilayer/resources-iphonehd/sprite.pvr.gz   (if not found, search next)
     	    internal_dir/gamescene/uilayer/sprite.pvr.gz                      (if not found, return "gamescene/uilayer/sprite.png")

     If the new file can't be found on the file system, it will return the parameter filename directly.
     
     This method was added to simplify multiplatform support. Whether you are using cocos2d-js or any cross-compilation toolchain like StellaSDK or Apportable,
     you might need to load different resources for a given file in the different platforms.

     @since v2.1
     */
    virtual std::string fullPathForFilename(const std::string &filename);
    
    /**
     * Loads the filenameLookup dictionary from the contents of a filename.
     * 
     * @note The plist file name should follow the format below:
     * 
     * @code
     * <?xml version="1.0" encoding="UTF-8"?>
     * <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
     * <plist version="1.0">
     * <dict>
     *     <key>filenames</key>
     *     <dict>
     *         <key>sounds/click.wav</key>
     *         <string>sounds/click.caf</string>
     *         <key>sounds/endgame.wav</key>
     *         <string>sounds/endgame.caf</string>
     *         <key>sounds/gem-0.wav</key>
     *         <string>sounds/gem-0.caf</string>
     *     </dict>
     *     <key>metadata</key>
     *     <dict>
     *         <key>version</key>
     *         <integer>1</integer>
     *     </dict>
     * </dict>
     * </plist>
     * @endcode
     * @param filename The plist file name.
     *
     @since v2.1
     * @js loadFilenameLookup
     * @lua loadFilenameLookup
     */
    virtual void loadFilenameLookupDictionaryFromFile(const std::string &filename);
    
    /** 
     *  Sets the filenameLookup dictionary.
     *
     *  @param pFilenameLookupDict The dictionary for replacing filename.
     *  @since v2.1
     */
    virtual void setFilenameLookupDictionary(const ValueMap& filenameLookupDict);
    
    /**
     *  Gets full path from a file name and the path of the reletive file.
     *  @param filename The file name.
     *  @param pszRelativeFile The path of the relative file.
     *  @return The full path.
     *          e.g. filename: hello.png, pszRelativeFile: /User/path1/path2/hello.plist
     *               Return: /User/path1/path2/hello.pvr (If there a a key(hello.png)-value(hello.pvr) in FilenameLookup dictionary. )
     *
     */
    virtual std::string fullPathFromRelativeFile(const std::string &filename, const std::string &relativeFile);

    /** 
     *  Sets the array that contains the search order of the resources.
     *
     *  @param searchResolutionsOrder The source array that contains the search order of the resources.
     *  @see getSearchResolutionsOrder(void), fullPathForFilename(const char*).
     *  @since v2.1
     *  In js:var setSearchResolutionsOrder(var jsval)
     *  @lua NA
     */
    virtual void setSearchResolutionsOrder(const std::vector<std::string>& searchResolutionsOrder);

    /**
      * Append search order of the resources.
      *
      * @see setSearchResolutionsOrder(), fullPathForFilename().
      * @since v2.1
      */
    virtual void addSearchResolutionsOrder(const std::string &order);
    
    /**
     *  Gets the array that contains the search order of the resources.
     *
     *  @see setSearchResolutionsOrder(const std::vector<std::string>&), fullPathForFilename(const char*).
     *  @since v2.1
     *  @lua NA
     */
    virtual const std::vector<std::string>& getSearchResolutionsOrder();
    
    /** 
     *  Sets the array of search paths.
     * 
     *  You can use this array to modify the search path of the resources.
     *  If you want to use "themes" or search resources in the "cache", you can do it easily by adding new entries in this array.
     *
     *  @note This method could access relative path and absolute path.
     *        If the relative path was passed to the vector, FileUtils will add the default resource directory before the relative path.
     *        For instance:
     *        	On Android, the default resource root path is "assets/".
     *        	If "/mnt/sdcard/" and "resources-large" were set to the search paths vector,
     *        	"resources-large" will be converted to "assets/resources-large" since it was a relative path.
     *
     *  @param searchPaths The array contains search paths.
     *  @see fullPathForFilename(const char*)
     *  @since v2.1
     *  In js:var setSearchPaths(var jsval);
     *  @lua NA
     */
    virtual void setSearchPaths(const std::vector<std::string>& searchPaths);
    
    /**
      * Add search path.
      *
      * @since v2.1
      */
    void addSearchPath(const std::string & path);
    
    /**
     *  Gets the array of search paths.
     *  
     *  @return The array of search paths.
     *  @see fullPathForFilename(const char*).
     *  @lua NA
     */
    virtual const std::vector<std::string>& getSearchPaths() const;

    /**
     *  Gets the writable path.
     *  @return  The path that can be write/read a file in
     */
    virtual std::string getWritablePath() const = 0;
    
    /**
     *  Checks whether a file exists.
     *
     *  @note If a relative path was passed in, it will be inserted a default root path at the beginning.
     *  @param strFilePath The path of the file, it could be a relative or absolute path.
     *  @return true if the file exists, otherwise it will return false.
     */
    virtual bool isFileExist(const std::string& filePath) const = 0;
    
    /**
     *  Checks whether the path is an absolute path.
     *
     *  @note On Android, if the parameter passed in is relative to "assets/", this method will treat it as an absolute path.
     *        Also on Blackberry, path starts with "app/native/Resources/" is treated as an absolute path.
     *
     *  @param strPath The path that needs to be checked.
     *  @return true if it's an absolute path, otherwise it will return false.
     */
    virtual bool isAbsolutePath(const std::string& path) const;
    
    
    /**
     *  Sets/Gets whether to pop-up a message box when failed to load an image.
     */
    virtual void setPopupNotify(bool notify);
    virtual bool isPopupNotify();

    /**
     *  Converts the contents of a file to a ValueMap.
     *  @note This method is used internally.
     */
    virtual ValueMap getValueMapFromFile(const std::string& filename);
    
    /**
     *  Write a ValueMap to a plist file.
     *  @note This method is used internally.
     */
    virtual bool writeToFile(ValueMap& dict, const std::string& fullPath);
    
    /**
     *  Converts the contents of a file to a ValueVector.
     *  @note This method is used internally.
     */
    virtual ValueVector getValueVectorFromFile(const std::string& filename);

    /** Returns the full path cache */
    const std::unordered_map<std::string, std::string>& getFullPathCache() const { return _fullPathCache; }

protected:
    /**
     *  The default constructor.
     */
    FileUtils();
    
    /**
     *  Initializes the instance of FileUtils. It will set _searchPathArray and _searchResolutionsOrderArray to default values.
     *
     *  @note When you are porting Cocos2d-x to a new platform, you may need to take care of this method.
     *        You could assign a default value to _defaultResRootPath in the subclass of FileUtils(e.g. FileUtilsAndroid). Then invoke the FileUtils::init().
     *  @return true if successed, otherwise it returns false.
     *
     */
    virtual bool init();
    
    /**
     *  Gets the new filename from the filename lookup dictionary.
     *  It is possible to have a override names.
     *  @param filename The original filename.
     *  @return The new filename after searching in the filename lookup dictionary.
     *          If the original filename wasn't in the dictionary, it will return the original filename.
     */
    virtual std::string getNewFilename(const std::string &filename);
    
    /**
     *  Gets full path for filename, resolution directory and search path.
     *
     *  @param filename The file name.
     *  @param resolutionDirectory The resolution directory.
     *  @param searchPath The search path.
     *  @return The full path of the file. It will return an empty string if the full path of the file doesn't exist.
     */
    virtual std::string getPathForFilename(const std::string& filename, const std::string& resolutionDirectory, const std::string& searchPath);
    
    /**
     *  Gets full path for the directory and the filename.
     *
     *  @note Only iOS and Mac need to override this method since they are using
     *        `[[NSBundle mainBundle] pathForResource: ofType: inDirectory:]` to make a full path.
     *        Other platforms will use the default implementation of this method.
     *  @param strDirectory The directory contains the file we are looking for.
     *  @param strFilename  The name of the file.
     *  @return The full path of the file, if the file can't be found, it will return an empty string.
     */
    virtual std::string getFullPathForDirectoryAndFilename(const std::string& directory, const std::string& filename);
    
    
    /** Dictionary used to lookup filenames based on a key.
     *  It is used internally by the following methods:
     *
     *  std::string fullPathForFilename(const char*);
     *
     *  @since v2.1
     */
    ValueMap _filenameLookupDict;
    
    /** 
     *  The vector contains resolution folders.
     *  The lower index of the element in this vector, the higher priority for this resolution directory.
     */
    std::vector<std::string> _searchResolutionsOrderArray;
    
    /**
     * The vector contains search paths.
     * The lower index of the element in this vector, the higher priority for this search path.
     */
    std::vector<std::string> _searchPathArray;
    
    /**
     *  The default root path of resources.
     *  If the default root path of resources needs to be changed, do it in the `init` method of FileUtils's subclass.
     *  For instance:
     *  On Android, the default root path of resources will be assigned with "assets/" in FileUtilsAndroid::init().
     *  Similarly on Blackberry, we assign "app/native/Resources/" to this variable in FileUtilsBlackberry::init().
     */
    std::string _defaultResRootPath;
    
    /**
     *  The full path cache. When a file is found, it will be added into this cache. 
     *  This variable is used for improving the performance of file search.
     */
    std::unordered_map<std::string, std::string> _fullPathCache;
    
    /**
     *  The singleton pointer of FileUtils.
     */
    static FileUtils* s_sharedFileUtils;
    
};

// end of platform group
/// @}

NS_CC_END

#endif    // __CC_FILEUTILS_H__