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diff --git a/nxcomp/Keeper.cpp b/nxcomp/Keeper.cpp
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+/**************************************************************************/
+/* */
+/* Copyright (c) 2001, 2007 NoMachine, http://www.nomachine.com/. */
+/* */
+/* NXCOMP, NX protocol compression and NX extensions to this software */
+/* are copyright of NoMachine. Redistribution and use of the present */
+/* software is allowed according to terms specified in the file LICENSE */
+/* which comes in the source distribution. */
+/* */
+/* Check http://www.nomachine.com/licensing.html for applicability. */
+/* */
+/* NX and NoMachine are trademarks of NoMachine S.r.l. */
+/* */
+/* All rights reserved. */
+/* */
+/**************************************************************************/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+
+#include "Keeper.h"
+
+//
+// Set the verbosity level.
+//
+
+#define PANIC
+#define WARNING
+#undef TEST
+#undef DEBUG
+
+//
+// Remove the directory if it's empty
+// since more than 30 * 24 h.
+//
+
+#define EMPTY_DIR_TIME 2592000
+
+//
+// Sleep once any ONCE entries.
+//
+
+#define ONCE 2
+
+//
+// Define this to trace messages while
+// they are allocated and deallocated.
+//
+
+#undef REFERENCES
+
+//
+// This is used for reference count.
+//
+
+#ifdef REFERENCES
+
+int File::references_ = 0;
+
+#endif
+
+bool T_older::operator () (File *a, File *b) const
+{
+ return a -> compare(b);
+}
+
+File::File()
+{
+ name_ = NULL;
+
+ size_ = 0;
+ time_ = 0;
+
+ #ifdef REFERENCES
+
+ references_++;
+
+ *logofs << "Keeper: Created new File at "
+ << this << " out of " << references_
+ << " allocated references.\n"
+ << logofs_flush;
+
+ #endif
+}
+
+//
+// TODO: This class can leak industrial amounts of memory.
+// I'm 100% sure that the desctructor is called and that
+// also the string pointed in the File structure is dele-
+// ted. Everything is logged, but still the memory is not
+// freed. This is less a problem on Windows, where the me-
+// mory occupation remains almost constant. Obviously the
+// problem lies in the STL allocators of the GNU libstc++.
+//
+
+File::~File()
+{
+ #ifdef TEST
+ *logofs << "Keeper: Deleting name for File at "
+ << this << ".\n" << logofs_flush;
+ #endif
+
+ delete [] name_;
+
+ #ifdef REFERENCES
+
+ *logofs << "Keeper: Deleted File at "
+ << this << " out of " << references_
+ << " allocated references.\n"
+ << logofs_flush;
+
+ references_--;
+
+ #endif
+}
+
+bool File::compare(File *b) const
+{
+ if (this -> time_ == b -> time_)
+ {
+ return (this -> size_ < b -> size_);
+ }
+
+ return (this -> time_ < b -> time_);
+}
+
+Keeper::Keeper(int caches, int images, const char *root,
+ int sleep, int parent)
+{
+ caches_ = caches;
+ images_ = images;
+ sleep_ = sleep;
+ parent_ = parent;
+
+ root_ = new char[strlen(root) + 1];
+
+ strcpy(root_, root);
+
+ total_ = 0;
+ signal_ = 0;
+
+ files_ = new T_files;
+}
+
+Keeper::~Keeper()
+{
+ empty();
+
+ delete files_;
+
+ delete [] root_;
+}
+
+int Keeper::cleanupCaches()
+{
+ #ifdef TEST
+ *logofs << "Keeper: Looking for cache directories in '"
+ << root_ << "'.\n" << logofs_flush;
+ #endif
+
+ DIR *rootDir = opendir(root_);
+
+ if (rootDir != NULL)
+ {
+ dirent *dirEntry;
+
+ struct stat fileStat;
+
+ int baseSize = strlen(root_);
+
+ int s = 0;
+
+ while (((dirEntry = readdir(rootDir)) != NULL))
+ {
+ if (s++ % ONCE == 0) usleep(sleep_ * 1000);
+
+ if (signal_ != 0) break;
+
+ if (strcmp(dirEntry -> d_name, "cache") == 0 ||
+ strncmp(dirEntry -> d_name, "cache-", 6) == 0)
+ {
+ char *dirName = new char[baseSize + strlen(dirEntry -> d_name) + 2];
+
+ if (dirName == NULL)
+ {
+ #ifdef WARNING
+ *logofs << "Keeper: WARNING! Can't check directory entry '"
+ << dirEntry -> d_name << "'.\n" << logofs_flush;
+ #endif
+
+ delete [] dirName;
+
+ continue;
+ }
+
+ strcpy(dirName, root_);
+ strcpy(dirName + baseSize, "/");
+ strcpy(dirName + baseSize + 1, dirEntry -> d_name);
+
+ #ifdef TEST
+ *logofs << "Keeper: Checking directory '" << dirName
+ << "'.\n" << logofs_flush;
+ #endif
+
+ if (stat(dirName, &fileStat) == 0 &&
+ S_ISDIR(fileStat.st_mode) != 0)
+ {
+ //
+ // Add to repository all the "C-" and
+ // "S-" files in the given directory.
+ //
+
+ collect(dirName);
+ }
+
+ delete [] dirName;
+ }
+ }
+
+ closedir(rootDir);
+ }
+ else
+ {
+ #ifdef WARNING
+ *logofs << "Keeper: WARNING! Can't open NX root directory '"
+ << root_ << "'. Error is " << EGET() << " '"
+ << ESTR() << "'.\n" << logofs_flush;
+ #endif
+
+ cerr << "Warning" << ": Can't open NX root directory '"
+ << root_ << "'. Error is " << EGET() << " '"
+ << ESTR() << "'.\n";
+ }
+
+ //
+ // Remove older files.
+ //
+
+ cleanup(caches_);
+
+ //
+ // Empty the repository.
+ //
+
+ empty();
+
+ return 1;
+}
+
+int Keeper::cleanupImages()
+{
+ #ifdef TEST
+ *logofs << "Keeper: Looking for image directory in '"
+ << root_ << "'.\n" << logofs_flush;
+ #endif
+
+ char *imagesPath = new char[strlen(root_) + strlen("/images") + 1];
+
+ if (imagesPath == NULL)
+ {
+ return -1;
+ }
+
+ strcpy(imagesPath, root_);
+ strcat(imagesPath, "/images");
+
+ //
+ // Check if the cache directory does exist.
+ //
+
+ struct stat dirStat;
+
+ if (stat(imagesPath, &dirStat) == -1)
+ {
+ #ifdef WARNING
+ *logofs << "Keeper: WARNING! Can't stat NX images cache directory '"
+ << imagesPath << ". Error is " << EGET() << " '"
+ << ESTR() << "'.\n" << logofs_flush;
+ #endif
+
+ cerr << "Warning" << ": Can't stat NX images cache directory '"
+ << imagesPath << ". Error is " << EGET() << " '"
+ << ESTR() << "'.\n";
+
+ delete [] imagesPath;
+
+ return -1;
+ }
+
+ //
+ // Check any of the 16 directories in the
+ // images root path.
+ //
+
+ char *digitPath = new char[strlen(imagesPath) + 5];
+
+ strcpy(digitPath, imagesPath);
+
+ for (char digit = 0; digit < 16; digit++)
+ {
+ //
+ // Give up if we received a signal or
+ // our parent is gone.
+ //
+
+ if (signal_ != 0)
+ {
+ #ifdef TEST
+ *logofs << "Keeper: Signal detected. Aborting.\n"
+ << logofs_flush;
+ #endif
+
+ goto KeeperCleanupImagesAbort;
+ }
+ else if (parent_ != getppid() || parent_ == 1)
+ {
+ #ifdef WARNING
+ *logofs << "Keeper: WARNING! Parent process appears "
+ << "to be dead. Returning.\n"
+ << logofs_flush;
+ #endif
+
+ goto KeeperCleanupImagesAbort;
+
+ return 0;
+ }
+
+ sprintf(digitPath + strlen(imagesPath), "/I-%01X", digit);
+
+ //
+ // Add to the repository all the files
+ // in the given directory.
+ //
+
+ collect(digitPath);
+ }
+
+ delete [] imagesPath;
+ delete [] digitPath;
+
+ //
+ // Remove the oldest files.
+ //
+
+ cleanup(images_);
+
+ //
+ // Empty the repository.
+ //
+
+ empty();
+
+ return 1;
+
+KeeperCleanupImagesAbort:
+
+ delete [] imagesPath;
+ delete [] digitPath;
+
+ empty();
+
+ return 0;
+}
+
+int Keeper::collect(const char *path)
+{
+ #ifdef TEST
+ *logofs << "Keeper: Looking for files in directory '"
+ << path << "'.\n" << logofs_flush;
+ #endif
+
+ DIR *cacheDir = opendir(path);
+
+ if (cacheDir != NULL)
+ {
+ File *file;
+
+ dirent *dirEntry;
+
+ struct stat fileStat;
+
+ int baseSize = strlen(path);
+ int fileSize = baseSize + 3 + MD5_LENGTH * 2 + 1;
+
+ int n = 0;
+ int s = 0;
+
+ while (((dirEntry = readdir(cacheDir)) != NULL))
+ {
+ if (s++ % ONCE == 0) usleep(sleep_ * 1000);
+
+ if (signal_ != 0) break;
+
+ if (strcmp(dirEntry -> d_name, ".") == 0 ||
+ strcmp(dirEntry -> d_name, "..") == 0)
+ {
+ continue;
+ }
+
+ n++;
+
+ if (strlen(dirEntry -> d_name) == (MD5_LENGTH * 2 + 2) &&
+ (strncmp(dirEntry -> d_name, "I-", 2) == 0 ||
+ strncmp(dirEntry -> d_name, "S-", 2) == 0 ||
+ strncmp(dirEntry -> d_name, "C-", 2) == 0))
+ {
+ file = new File();
+
+ char *fileName = new char[fileSize];
+
+ if (file == NULL || fileName == NULL)
+ {
+ #ifdef WARNING
+ *logofs << "Keeper: WARNING! Can't add file '"
+ << dirEntry -> d_name << "' to repository.\n"
+ << logofs_flush;
+ #endif
+
+ delete [] fileName;
+
+ delete file;
+
+ continue;
+ }
+
+ strcpy(fileName, path);
+ strcpy(fileName + baseSize, "/");
+ strcpy(fileName + baseSize + 1, dirEntry -> d_name);
+
+ file -> name_ = fileName;
+
+ #ifdef DEBUG
+ *logofs << "Keeper: Adding file '" << file -> name_
+ << "'.\n" << logofs_flush;
+ #endif
+
+ if (stat(file -> name_, &fileStat) == -1)
+ {
+ #ifdef WARNING
+ *logofs << "Keeper: WARNING! Can't stat NX file '"
+ << file -> name_ << ". Error is " << EGET()
+ << " '" << ESTR() << "'.\n"
+ << logofs_flush;
+ #endif
+
+ delete file;
+
+ continue;
+ }
+
+ file -> size_ = fileStat.st_size;
+ file -> time_ = fileStat.st_mtime;
+
+ files_ -> insert(T_files::value_type(file));
+
+ total_ += file -> size_;
+ }
+ }
+
+ closedir(cacheDir);
+
+ if (n == 0)
+ {
+ time_t now = time(NULL);
+
+ if (now > 0 && stat(path, &fileStat) == 0)
+ {
+ #ifdef TEST
+ *logofs << "Keeper: Empty NX subdirectory '" << path
+ << "' unused since " << now - fileStat.st_mtime
+ << " S.\n" << logofs_flush;
+ #endif
+
+ if (now - fileStat.st_mtime > EMPTY_DIR_TIME)
+ {
+ #ifdef TEST
+ *logofs << "Keeper: Removing empty NX subdirectory '"
+ << path << "'.\n" << logofs_flush;
+ #endif
+
+ rmdir(path);
+ }
+ }
+ }
+ }
+ else
+ {
+ #ifdef WARNING
+ *logofs << "Keeper: WARNING! Can't open NX subdirectory '"
+ << path << ". Error is " << EGET() << " '" << ESTR()
+ << "'.\n" << logofs_flush;
+ #endif
+
+ cerr << "Warning" << ": Can't open NX subdirectory '"
+ << path << ". Error is " << EGET() << " '" << ESTR()
+ << "'.\n";
+ }
+
+ return 1;
+}
+
+int Keeper::cleanup(int threshold)
+{
+ #ifdef TEST
+ *logofs << "Keeper: Deleting the oldest files with "
+ << files_ -> size() << " elements threshold "
+ << threshold << " and size " << total_ << ".\n"
+ << logofs_flush;
+ #endif
+
+ //
+ // At least some versions of the standard
+ // library don't allow erasing an element
+ // while looping. This is not the most ef-
+ // ficient way to release the objects, but
+ // it's better than making a copy of the
+ // container.
+ //
+
+ while (total_ > threshold && files_ -> size() > 0)
+ {
+ T_files::iterator i = files_ -> begin();
+
+ File *file = *i;
+
+ #ifdef TEST
+ *logofs << "Keeper: Removing '" << file -> name_
+ << "' with time " << file -> time_ << " and size "
+ << file -> size_ << ".\n" << logofs_flush;
+ #endif
+
+ unlink(file -> name_);
+
+ total_ -= file -> size_;
+
+ #ifdef DEBUG
+ *logofs << "Keeper: Going to delete the file at "
+ << file << " while cleaning up.\n"
+ << logofs_flush;
+ #endif
+
+ delete file;
+
+ #ifdef DEBUG
+ *logofs << "Keeper: Going to erase the element "
+ << "while cleaning up.\n"
+ << logofs_flush;
+ #endif
+
+ files_ -> erase(i);
+ }
+
+ #ifdef TEST
+ *logofs << "Keeper: Bytes in repository are "
+ << total_ << ".\n" << logofs_flush;
+ #endif
+
+ return 1;
+}
+
+void Keeper::empty()
+{
+ #ifdef TEST
+ *logofs << "Keeper: Getting rid of files in repository.\n"
+ << logofs_flush;
+ #endif
+
+ while (files_ -> size() > 0)
+ {
+ T_files::iterator i = files_ -> begin();
+
+ File *file = *i;
+
+ #ifdef DEBUG
+ *logofs << "Keeper: Going to delete the file at "
+ << file << " while emptying.\n"
+ << logofs_flush;
+ #endif
+
+ delete file;
+
+ #ifdef DEBUG
+ *logofs << "Keeper: Going to erase the element "
+ << "while emptying.\n"
+ << logofs_flush;
+ #endif
+
+ files_ -> erase(i);
+ }
+
+ total_ = 0;
+
+ #ifdef TEST
+ *logofs << "Keeper: Bytes in repository are "
+ << total_ << ".\n" << logofs_flush;
+ #endif
+}
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