Public Member Functions | |
OFFilenameCreator () | |
default constructor | |
OFFilenameCreator (const OFFilenameCreator ©) | |
copy constructor | |
virtual | ~OFFilenameCreator () |
destructor | |
OFFilenameCreator & | operator= (const OFFilenameCreator ©) |
assignment operator | |
OFBool | makeFilename (unsigned int seed, const char *dir, const char *prefix, const char *postfix, OFString &filename) |
creates a new unique filename. | |
Static Public Member Functions | |
static unsigned int | hashString (const char *str) |
creates hash value. | |
static int | myrand_r (unsigned int *seed) |
simple but thread safe random number generator. | |
Static Private Member Functions | |
static void | addLongToString (unsigned long l, OFString &s) |
appends the lower 32 bit of the given number to the given string. | |
Private Attributes | |
unsigned long | creation_time |
date/time of creation of this object |
Definition at line 39 of file offname.h.
OFBool OFFilenameCreator::makeFilename | ( | unsigned int | seed, | |
const char * | dir, | |||
const char * | prefix, | |||
const char * | postfix, | |||
OFString & | filename | |||
) |
creates a new unique filename.
seed | seed of random number generator | |
dir | directory in which the file name should be located | |
prefix | filename prefix | |
postfix | filename postfix | |
filename | string in which the filename (path) is returned |
static unsigned int OFFilenameCreator::hashString | ( | const char * | str | ) | [static] |
creates hash value.
(i.e. random seed) from character string.
str | null-terminated string |
static int OFFilenameCreator::myrand_r | ( | unsigned int * | seed | ) | [static] |
simple but thread safe random number generator.
The interface is derived from the Posix rand_r function. Uses a multiplicative congruential random-number generator with period 2**32 that returns successive pseudo-random numbers in the range of 0 to 0x7fffffff.
seed | pointer to seed of random number generator, must not be NULL. |
static void OFFilenameCreator::addLongToString | ( | unsigned long | l, | |
OFString & | s | |||
) | [static, private] |
appends the lower 32 bit of the given number to the given string.
Always appends exactly 8 digits (padded with leading zeroes).
l | number to be appended to string | |
s | string to be added to |