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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef _CACHE_DIR_H
#define _CACHE_DIR_H
#include <string>
/**
* Utility class, which helps in tagging a directory as being cache only,
* by saving a certain, well defiend file in this dir.
* This tag can be used when creating backups for example,
* where backups would exclude dirs tagged with this method.
* The file used as a tag:
* name: "CACHEDIR.TAG"
* content: "Signature: 8a477f597d28d172789f06886806bc55"
*
* This is following a convention described here (DEAD LINKS):
* http://www.brynosaurus.com/cachedir/
* and defined here:
* http://www.brynosaurus.com/cachedir/spec.html
*/
class CacheDir {
CacheDir() = delete;
CacheDir(const CacheDir&) = delete;
public:
static const std::string tagFile_name;
static const std::string tagFile_content;
static const size_t tagFile_content_size;
static const std::string defaultAdditionalText;
/**
* Checks if the dir is marked as a cache dir.
* @return true if the dir exists and is tagged as cache dir, false otherwise
*/
static bool IsCacheDir(const std::string& dir);
/**
* Sets or unsets a dir as cache dir.
* This removes or creates the tag file.
* @param dir directory to be used as cache
* @param wantedCacheState if true, writes a CACHEDIR.TAG
* @param additionalText only used if (wantedCacheState == true), is appended in the cache tag file
* @param forceRewrite if set to true, the tag file will be rewritten even if a valid one already exists (default: false)
* @return true if the dir tag file was successfully removed, created or already existed, false otherwise
*/
static bool SetCacheDir(const std::string& dir, bool wantedCacheState,
const std::string& additionalText = CacheDir::defaultAdditionalText,
bool forceRewrite = false);
private:
/**
* Checks if the specified files content starts with the first content_size
* chars of content.
* @param filePath the file which content to compare to
* @param content the chars to compare to
* @param content_size how many chars to compare
* @return true if the this is a cache tag file, false otherwise
*/
static bool FileContentStartsWith(const std::string& filePath, const std::string& content, size_t content_size);
/**
* Writes the cache tag file content to filePath.
* @return true if all content was successfully written, false otherwise
*/
static bool WriteCacheTagFile(const std::string& filePath, const std::string& additionalText);
static std::string GetCacheTagFilePath(const std::string& dir);
};
#endif // _CACHE_DIR_H
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