DCMTK: OFStandard Class Reference

DCMTK Version 3.6.9 OFFIS DICOM Toolkit

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Classes | Public Types | Static Public Member Functions | List of all members
OFStandard Class Reference

A class for various helper functions. More...

## Classes
class | OFGroup
| A non-POD version of "struct group" for thread- and memory-safe data access. More...
class | OFPasswd
| A non-POD version of "struct passwd" for thread- and memory-safe data access. More...

## Public Types
enum | E_MarkupMode { MM_HTML , MM_HTML32 , MM_XHTML , MM_XML }
| Markup language mode. More...

## Static Public Member Functions
static size_t | strlcpy (char *dst, const char *src, size_t siz)
| This function copies up to size - 1 characters from the NUL- terminated string src to dst, NUL-terminating the result.
static size_t | strlcat (char *dst, const char *src, size_t siz)
| This function appends the NUL-terminated string src to the end of dst.
static int | snprintf (char *str, size_t size, const char *format,...)
| Standard C99 formatted string output function.
static int | vsnprintf (char *str, size_t size, const char *format, va_list ap)
| Standard C99 formatted string output function.
static const char * | strerror (const int errnum, char *buf, const size_t buflen)
| convert a given error code to a string.
static OFString & | toUpper (OFString &result, const OFString &value)
| returns the upper-case version of a given string
static OFString & | toUpper (OFString &value)
| returns the upper-case version of a given string.
static OFString & | toLower (OFString &result, const OFString &value)
| returns the lower-case version of a given string
static OFString & | toLower (OFString &value)
| returns the lower-case version of a given string.
static OFBool | pathExists (const OFFilename &pathName)
| check whether the given path exists.
static OFBool | fileExists (const OFFilename &fileName)
| check whether the given file exists.
static OFBool | dirExists (const OFFilename &dirName)
| check whether the given directory exists.
static OFBool | isReadable (const OFFilename &pathName)
| check whether the given path is readable.
static OFBool | isWriteable (const OFFilename &pathName)
| check whether the given path is writeable.
static OFString & | getDirNameFromPath (OFString &result, const OFString &pathName, const OFBool assumeDirName=OFTrue)
| get directory name component from given path name.
static OFFilename & | getDirNameFromPath (OFFilename &result, const OFFilename &pathName, const OFBool assumeDirName=OFTrue)
| get directory name component from given path name.
static OFString & | getFilenameFromPath (OFString &result, const OFString &pathName, const OFBool assumeFilename=OFTrue)
| get file name component from given path name.
static OFFilename & | getFilenameFromPath (OFFilename &result, const OFFilename &pathName, const OFBool assumeFilename=OFTrue)
| get file name component from given path name.
static OFString & | normalizeDirName (OFString &result, const OFString &dirName, const OFBool allowEmptyDirName=OFFalse)
| normalize the given directory name.
static OFFilename & | normalizeDirName (OFFilename &result, const OFFilename &dirName, const OFBool allowEmptyDirName=OFFalse)
| normalize the given directory name.
static OFString & | combineDirAndFilename (OFString &result, const OFString &dirName, const OFString &fileName, const OFBool allowEmptyDirName=OFFalse)
| combine the given directory and file name.
static OFFilename & | combineDirAndFilename (OFFilename &result, const OFFilename &dirName, const OFFilename &fileName, const OFBool allowEmptyDirName=OFFalse)
| combine the given directory and file name.
static OFCondition | removeRootDirFromPathname (OFFilename &result, const OFFilename &rootDir, const OFFilename &pathName, const OFBool allowLeadingPathSeparator=OFTrue)
| remove root directory prefix from given path name.
static OFFilename & | appendFilenameExtension (OFFilename &result, const OFFilename &fileName, const OFFilename &fileExtension)
| append a filename extension to the given filename
static size_t | searchDirectoryRecursively (const OFString &directory, OFList< OFString > &fileList, const OFString &pattern="", const OFString &dirPrefix="", const OFBool recurse=OFTrue)
| scan a given directory (recursively) and add all filenames found to a list
static size_t | searchDirectoryRecursively (const OFFilename &directory, OFList< OFFilename > &fileList, const OFFilename &pattern, const OFFilename &dirPrefix, const OFBool recurse=OFTrue)
| scan a given directory (recursively) and add all filenames found to a list
static OFCondition | createDirectory (const OFFilename &dirName, const OFFilename &rootDir)
| create a directory (including sub-directories) if it does not yet exist.
static OFBool | copyFile (const OFFilename &sourceFilename, const OFFilename &destFilename)
| copy an existing file to a new file
static OFBool | deleteFile (const OFFilename &filename)
| delete given file from filesystem
static OFBool | renameFile (const OFFilename &oldFilename, const OFFilename &newFilename)
| change name of a given file
static size_t | getFileSize (const OFFilename &filename)
| determine size of given file (in bytes)
static OFBool | checkForMarkupConversion (const OFString &sourceString, const OFBool convertNonASCII=OFFalse, const size_t maxLength=0)
| check whether conversion to a HTML/XML mnenonic string is required.
static OFCondition | convertToMarkupStream (STD_NAMESPACE ostream &out, const OFString &sourceString, const OFBool convertNonASCII=OFFalse, const E_MarkupMode markupMode=MM_XML, const OFBool newlineAllowed=OFFalse, const size_t maxLength=0)
| convert character string to a HTML/XHTML/XML mnenonic stream.
static const OFString & | convertToMarkupString (const OFString &sourceString, OFString &markupString, const OFBool convertNonASCII=OFFalse, const E_MarkupMode markupMode=MM_XML, const OFBool newlineAllowed=OFFalse, const size_t maxLength=0)
| convert character string to a HTML/XHTML/XML mnenonic string.
static OFBool | checkForOctalConversion (const OFString &sourceString, const size_t maxLength=0)
| check whether conversion to an octal format is required.
static OFCondition | convertToOctalStream (STD_NAMESPACE ostream &out, const OFString &sourceString, const size_t maxLength=0)
| convert character string to an octal format stream.
static const OFString & | convertToOctalString (const OFString &sourceString, OFString &octalString, const size_t maxLength=0)
| convert character string to an octal format string.
static OFCondition | encodeBase64 (STD_NAMESPACE ostream &out, const unsigned char *data, const size_t length, const size_t width=0)
| encode binary data according to "Base64" as described in RFC 2045 (MIME).
static const OFString & | encodeBase64 (const unsigned char *data, const size_t length, OFString &result, const size_t width=0)
| encode binary data according to "Base64" as described in RFC 2045 (MIME).
static size_t | decodeBase64 (const OFString &data, unsigned char *&result)
| decode "Base64" encoded string.
static double | atof (const char *s, OFBool *success=NULL)
| converts a floating-point number from an ASCII decimal representation to internal double-precision format.
static void | ftoa (char *target, size_t targetSize, double value, unsigned int flags=0, int width=0, int precision=-1)
| formats a floating-point number into an ASCII string.

## ftoa() processing flags.
These flags can be combined by bit-wise or.
static const unsigned int | ftoa_format_e
| Use scientific format (equivalent to e or E in printf), instead of the default, which is equivalent to g or G.
static const unsigned int | ftoa_format_f
| Use fixed format (equivalent to f or F in printf), instead of the default, which is equivalent to g or G If both ftoa_format_e and ftoa_format_f are specified, ftoa_format_e format is used.
static const unsigned int | ftoa_uppercase
| Use an uppercase 'E' letter (like E, F or G in printf)
static const unsigned int | ftoa_alternate
| convert value to alternate form.
static const unsigned int | ftoa_leftadj
| left-justify number be within the field
static const unsigned int | ftoa_zeropad
| pad with zeroes instead of blanks
static unsigned int | sleep (unsigned int seconds)
| makes the current process sleep until seconds seconds have elapsed or a signal arrives which is not ignored
static void | milliSleep (unsigned int millisecs)
| makes the current process sleep until the given number of milliseconds have elapsed or a signal which is not ignored arrives
static long | getProcessID ()
| Determines the identification of the running process.
static OFBool | check32BitAddOverflow (const Uint32 summand1, const Uint32 summand2)
| check whether the addition of two 32-bit integers yields in an overflow
template<typename T>
static OFBool | safeSubtract (T minuend, T subtrahend, T &difference)
| check whether subtraction is safe (i.e. no underflow occurs) and if so, perform it (i.e. compute minuend-subtrahend=difference).
template<typename T>
static OFBool | safeAdd (T a, T b, T &sum)
| check whether addition is safe (i.e. no overflow occurs) and if so, perform it (i.e. compute a+b=sum).
template<typename T>
static OFBool | safeMult (T a, T b, T &product)
| check whether multiplication is safe (i.e. no overflow occurs) and if so, perform it (i.e. compute a*b=product).
template<size_t Count>
static OFBool | checkDigits (const char *string)
| checks if a string only contains valid decimal digits, i.e. 0-9.
template<typename T, size_t Count>
static T | extractDigits (const char *)
| extracts digits from a string and converts them to the given integer number type.
static void | trimString (const char *&pBegin, const char *&pEnd)
| An utility function that finds a substring within a string that does not contain leading and trailing spaces and null bytes, effectively trimming the string without unnecessary copies.
static void | trimString (const char *&str, size_t &size)
| An utility function that finds a substring within a string that does not contain leading and trailing spaces and null bytes, effectively trimming the string without unnecessary copies.
static OFString | getHostnameByAddress (const char *addr, int len, int type)
| This function performs a reverse DNS lookup of a hostname.
static void | getAddressByHostname (const char *name, int protocolFamily, OFSockAddr &result)
| This function performs a DNS lookup of an IP address based on a hostname.
static OFGroup | getGrNam (const char *name)
| Thread-safe version of getgrnam.
static OFPasswd | getPwNam (const char *name)
| Thread-safe version of getpwnam.
static OFCondition | dropPrivileges ()
| On Posix-like platform, this method executes setuid(getuid()), which causes the application to revert from root privileges to those of the calling user when the program is installed as setuid root.
static OFString | getUserName ()
| Retrieve the name of the user that started the current process.
static OFString | getHostName ()
| Retrieve the local domain name, e.
static void | initializeNetwork ()
| Initialize the network API (if necessary), e.g. Winsock.
static void | shutdownNetwork ()
| Shutdown the network API (if necessary), e.g. Winsock.
static OFerror_code | getLastSystemErrorCode ()
| Retrieve the last operating system error code that was emitted in the calling thread.
static OFerror_code | getLastNetworkErrorCode ()
| Retrieve the last network specific error code that was emitted in the calling thread.
static void | forceSleep (Uint32 seconds)
| Method that ensures that the current thread is actually sleeping for the defined number of seconds (at least).
static void | sanitizeFilename (OFString &fname)
| sanitize a filename (NOT a path name!) by replacing all path separators with underscores.
static void | sanitizeFilename (char *fname)
| sanitize a filename (NOT a path name!) by replacing all path separators with underscores.
static OFString | getDefaultSupportDataDir ()
| retrieve the name of the default directory for support data.
static OFString | getDefaultConfigurationDir ()
| retrieve the name of the default directory for configuration files.
static bool | isspace (char ch)
| check if the character is a whitespace character assuming the C locale.
static size_t | my_strlcpy (char *dst, const char *src, size_t siz)
| private implementation of strlcpy.
static size_t | my_strlcat (char *dst, const char *src, size_t siz)
| private implementation of strlcat.
static unsigned int | my_sleep (unsigned int seconds)
| makes the current process sleep until seconds seconds have elapsed or a signal arrives which is not ignored

## Detailed Description

A class for various helper functions.

This class is used to comprise a number of "global" helper functions.

## Member Enumeration Documentation

## ◆ E_MarkupMode

enum OFStandard::E_MarkupMode

Markup language mode.

Enumerator
MM_HTML | HTML (Hyper Text Markup Language)
MM_HTML32 | HTML 3.2 (Hyper Text Markup Language)
MM_XHTML | XHTML (Extensible Hyper Text Markup Language)
MM_XML | XML (Extensible Markup Language)

## Member Function Documentation

## ◆ appendFilenameExtension()

static OFFilename & OFStandard::appendFilenameExtension | ( | OFFilename & | result,
|  | const OFFilename & | fileName,
|  | const OFFilename & | fileExtension )
| static

append a filename extension to the given filename

Parameters

  result | string variable in which the resulting filename is stored. This name may contain wide characters if support is enabled and 'fileName' contains wide characters. In any case, the resulting string is stored with UTF-8 encoding (8-bit) as an alternative representation.
  fileName | filename to which the extension should be appended. This name may contain wide characters if support is enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  fileExtension | filename extension to be appended (e.g. ".bak"). It is converted to wide characters if 'fileName' contains wide characters.

Returns
  reference to the resulting path name (same as 'result')

## ◆ atof()

static double OFStandard::atof | ( | const char * | s,
|  | OFBool * | success = NULL )
| static

converts a floating-point number from an ASCII decimal representation to internal double-precision format.

Unlike the atof() function defined in Posix, this implementation is not affected by a locale setting, the radix character is always assumed to be '.'. This implementation never modifies errno. It does handle "NaN" and "Inf" (case insensitive; following characters are ignored). A return code indicates whether or not a successful conversion could be performed. Very large numbers that cannot be represented as a double will cause the success value to be set to false, unless the old implementation is enabled through the ENABLE_OLD_OFSTD_ATOF_IMPLEMENTATION macro, in which case HUGE_VAL and success will be returned.

Parameters

  s | A decimal ASCII floating-point number, optionally preceded by white space. Must have form "-I.FE-X", where I is the integer part of the mantissa, F is the fractional part of the mantissa, and X is the exponent. Either of the signs may be "+", "-", or omitted. Either I or F may be omitted, or both. The decimal point isn't necessary unless F is present. The "E" may actually be an "e". E and X may both be omitted (but not just one).
  success | pointer to return status code, may be NULL. if present, a status code is stored in the variable pointed to by this parameter. The status is OFTrue if a conversion could be performed and OFFalse if the string does not have the expected format.

Returns
  floating-point equivalent of string. If a terminating character is found before any floating-point digits, then zero is returned.

## ◆ check32BitAddOverflow()

static OFBool OFStandard::check32BitAddOverflow | ( | const Uint32 | summand1,
|  | const Uint32 | summand2 )
| inlinestatic

check whether the addition of two 32-bit integers yields in an overflow

Parameters

  summand1 | first integer value to be added
  summand2 | second integer value to be added

Returns
  OFTrue if an overflow occurred during the addition, OFFalse otherwise

## ◆ checkDigits()

template<size_t Count>

static OFBool OFStandard::checkDigits | ( | const char * | string | ) |
| static

checks if a string only contains valid decimal digits, i.e. 0-9.

Template Parameters

  Count | the number of characters (bytes) to check.

Parameters

  string | a pointer to a character array to check.

Returns
  OFTrue if all characters are valid decimal digits, OFFalse if at least one non-digit character is encountered.

Referenced by extractDigits().

## ◆ checkForMarkupConversion()

static OFBool OFStandard::checkForMarkupConversion | ( | const OFString & | sourceString,
|  | const OFBool | convertNonASCII = OFFalse,
|  | const size_t | maxLength = 0 )
| static

check whether conversion to a HTML/XML mnenonic string is required.

This check can be performed before convertToMarkupStream() or convertToMarkupString() is called in order to speed up the process in case the conversion is not required.

Parameters

  sourceString | source string to be checked. May contain one or more NULL bytes.
  convertNonASCII | convert non-ASCII characters (< #32 and >= #127) to numeric value (&#nnn;) if OFTrue
  maxLength | maximum number of characters from the source string to be converted. A value of 0 means all characters.

Returns
  OFTrue if markup conversion is required, OFFalse otherwise

## ◆ checkForOctalConversion()

static OFBool OFStandard::checkForOctalConversion | ( | const OFString & | sourceString,
|  | const size_t | maxLength = 0 )
| static

check whether conversion to an octal format is required.

This check can be performed before convertToOctalStream() or convertToOctalString() is called in order to speed up the process in case the conversion is not required.

Parameters

  sourceString | source string to be checked. May contain one or more NULL bytes.
  maxLength | maximum number of characters from the source string to be converted. A value of 0 means all characters.

Returns
  OFTrue if markup conversion is required, OFFalse otherwise

## ◆ combineDirAndFilename() [1/2]

static OFFilename & OFStandard::combineDirAndFilename | ( | OFFilename & | result,
|  | const OFFilename & | dirName,
|  | const OFFilename & | fileName,
|  | const OFBool | allowEmptyDirName = OFFalse )
| static

combine the given directory and file name.

Normalizes the directory name and appends the file name (with a path separator) if not empty. If both 'dirName' and 'fileName' are empty strings and the flag 'allowEmptyDirName' is OFFalse the resulting path name is set to "." (current directory). If 'dirName' is "." and the flag 'allowEmptyDirName' is OFTrue an empty directory name is used. NB: This function neither checks whether the given 'dirName' exists nor whether the resulting path name points to a valid or existing file name. Furthermore, the value of 'dirName' is ignored if 'fileName' starts with a path separator.

Parameters

  result | string variable in which the resulting path name is stored. This name may contain wide characters if support is enabled and 'dirName' as well as 'fileName' contain wide characters. In any case, the resulting string is stored with UTF-8 encoding (8-bit) as an alternative representation.
  dirName | directory name to be combined with the file name. This name may contain wide characters if support is enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  fileName | file name to be combined with the directory name. Should contain wide characters if and only if 'dirName' contains wide characters.
  allowEmptyDirName | flag indicating whether an empty directory name is allowed

Returns
  reference to the resulting path name (same as 'result')

## ◆ combineDirAndFilename() [2/2]

static OFString & OFStandard::combineDirAndFilename | ( | OFString & | result,
|  | const OFString & | dirName,
|  | const OFString & | fileName,
|  | const OFBool | allowEmptyDirName = OFFalse )
| static

combine the given directory and file name.

Normalizes the directory name and appends the file name (with a path separator) if not empty. If both 'dirName' and 'fileName' are empty strings and the flag 'allowEmptyDirName' is OFFalse the resulting path name is set to "." (current directory). If 'dirName' is "." and the flag 'allowEmptyDirName' is OFTrue an empty directory name is used. NB: This function neither checks whether the given 'dirName' exists nor whether the resulting path name points to a valid or existing file name. Furthermore, the value of 'dirName' is ignored if 'fileName' starts with a path separator.

Note
  This method is provided for reasons of backward compatibility. Internally, the following method (OFFilename version) is used.

Parameters

  result | string variable in which the resulting path name is stored
  dirName | directory name to be combined with the file name
  fileName | file name to be combined with the directory name
  allowEmptyDirName | flag indicating whether an empty directory name is allowed

Returns
  reference to the resulting path name (same as 'result')

## ◆ convertToMarkupStream()

static OFCondition OFStandard::convertToMarkupStream | ( | STD_NAMESPACE ostream & | out,
|  | const OFString & | sourceString,
|  | const OFBool | convertNonASCII = OFFalse,
|  | const E_MarkupMode | markupMode = MM_XML,
|  | const OFBool | newlineAllowed = OFFalse,
|  | const size_t | maxLength = 0 )
| static

convert character string to a HTML/XHTML/XML mnenonic stream.

Characters with special meaning for HTML/XHTML/XML (e.g. '<' and '&') are replaced by the corresponding mnenonics (e.g. "&lt;" and "&amp;"). If flag 'convertNonASCII' is OFTrue, all characters < #32 and >= #127 are also converted (useful if only HTML 3.2 is supported which does not allow to specify the character set). In HTML 3.2 mode, the quotation mark (") is converted to "&#34;" instead of """ because the latter entity is not defined. In HTML mode, the apostrophe sign (') is converted to "&#39;" instead of "'" for the same reason. @note This method might create invalid character entity references, such as "&#27;" for ESC, if contained in the 'sourceString'. An XML document with such character entities cannot be parsed by most XML parsers. However, removing them from the output stream would also be no option. @param out stream used for the HTML/XHTML/XML mnenonic output @param sourceString source string to be converted. May contain one or more NULL bytes. @param convertNonASCII convert non-ASCII characters (< # 32 and >= #127) to numeric value (@&@#nnn;) if OFTrue. This might lead to invalid XML character entity references. @param markupMode convert to HTML, HTML 3.2, XHTML or XML markup. LF and CR are encoded as "&#10;" and "&#13;" in XML mode, the flag 'newlineAllowed' has no meaning in this case. @param newlineAllowed optional flag indicating whether newlines are allowed or not. If they are allowed, the text "
" (HTML) or "
" (XHTML) is used, "¶" otherwise. The following combinations are accepted: LF, CR, LF CR, CF LF.

Parameters

  maxLength | maximum number of characters from the source string to be converted. A value of 0 means all characters.

Returns
  status, always returns EC_Normal

References MM_XML.

## ◆ convertToMarkupString()

static const OFString & OFStandard::convertToMarkupString | ( | const OFString & | sourceString,
|  | OFString & | markupString,
|  | const OFBool | convertNonASCII = OFFalse,
|  | const E_MarkupMode | markupMode = MM_XML,
|  | const OFBool | newlineAllowed = OFFalse,
|  | const size_t | maxLength = 0 )
| static

convert character string to a HTML/XHTML/XML mnenonic string.

Characters with special meaning for HTML/XHTML/XML (e.g. '<' and '&') are replaced by the corresponding mnenonics (e.g. "&lt;" and "&amp;"). If flag 'convertNonASCII' is OFTrue, all characters < #32 and >= #127 are also converted (useful if only HTML 3.2 is supported which does not allow to specify the character set). In HTML 3.2 mode, the quotation mark (") is converted to "&#34;" instead of """ because the latter entity is not defined. In HTML mode, the apostrophe sign (') is converted to "&#39;" instead of "'" for the same reason. @note This method might create invalid character entity references, such as "&#27;" for ESC, if contained in the 'sourceString'. An XML document with such character entities cannot be parsed by most XML parsers. However, removing them from the 'markupString' would also be no option. @param sourceString source string to be converted. May also contain one or more NULL bytes. @param markupString reference to character string where the result should be stored @param convertNonASCII convert non-ASCII characters (< # 32 and >= #127) to numeric value (@&@#nnn;) if OFTrue. This might lead to invalid XML character entity references. @param markupMode convert to HTML, HTML 3.2, XHTML or XML markup string. LF and CR are encoded as "&#10;" and "&#13;" in XML mode, the flag 'newlineAllowed' has no meaning in this case. @param newlineAllowed optional flag indicating whether newlines are allowed or not. If they are allowed, the text "
" (HTML) or "
" (XHTML) is used, "¶" otherwise. The following combinations are accepted: LF, CR, LF CR, CF LF.

Parameters

  maxLength | maximum number of characters from the source string to be converted. A value of 0 means all characters.

Returns
  reference to resulting 'markupString' (might be empty if 'sourceString' was empty)

References MM_XML.

## ◆ convertToOctalStream()

static OFCondition OFStandard::convertToOctalStream | ( | STD_NAMESPACE ostream & | out,
|  | const OFString & | sourceString,
|  | const size_t | maxLength = 0 )
| static

convert character string to an octal format stream.

All non-ASCII and control characters (code < #32 and >= #127) are converted to their octal representation, i.e. to '\ooo' where 'ooo' are the three octal digits of the character. All other characters are output as is. See section 6.1.2.3 in DICOM PS 3.5.

Parameters

  out | stream used for the output
  sourceString | source string to be converted. May contain one or more NULL bytes.
  maxLength | maximum number of characters from the source string to be converted. A value of 0 means all characters.

Returns
  status, always returns EC_Normal

## ◆ convertToOctalString()

static const OFString & OFStandard::convertToOctalString | ( | const OFString & | sourceString,
|  | OFString & | octalString,
|  | const size_t | maxLength = 0 )
| static

convert character string to an octal format string.

All non-ASCII and control characters (code < #32 and >= #127) are converted to their octal representation, i.e. to '\ooo' where 'ooo' are the three octal digits of the character. All other characters are output as is. See section 6.1.2.3 in DICOM PS 3.5.

Parameters

  sourceString | source string to be converted. May contain one or more NULL bytes.
  octalString | reference to character string where the result should be stored
  maxLength | maximum number of characters from the source string to be converted. A value of 0 means all characters.

Returns
  reference to resulting 'octalString' (might be empty if 'sourceString' was empty)

## ◆ copyFile()

static OFBool OFStandard::copyFile | ( | const OFFilename & | sourceFilename,
|  | const OFFilename & | destFilename )
| static

copy an existing file to a new file

Parameters

  sourceFilename | name of the existing file (including directory) to be copied. This filename may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  destFilename | name of the new file (including directory) to be created as a copy. This filename may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.

Returns
  OFTrue if copying the file was successful, OFFalse otherwise. On most systems, the 'errno' variable is also set to a system-specific error code in case of failure.

## ◆ createDirectory()

static OFCondition OFStandard::createDirectory | ( | const OFFilename & | dirName,
|  | const OFFilename & | rootDir )
| static

create a directory (including sub-directories) if it does not yet exist.

In other words, this function creates directories recursively, i.e. with all sub-components.

Parameters

  dirName | name of the directory to be created. This name may contain wide characters if support is enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  rootDir | optional name of a root directory (prefix of 'dirName') that already exists and that can, therefore, be skipped during the creation of sub-directories. Should contain wide characters if and only if 'dirName' contains wide characters.

Returns
  status, EC_Normal if successful (directory created or already exists), an error code otherwise

## ◆ decodeBase64()

static size_t OFStandard::decodeBase64 | ( | const OFString & | data,
|  | unsigned char *& | result )
| static

decode "Base64" encoded string.

Any character that does not belong to the Base64 alphabet (0..9, A..Z, a..z, + and /) is ignored when decoding the input string. This is especially true for line breaks which are usually contained in MIME (RFC 2045) encoded streams (see above). The first occurrence of a '=' character is taken as evidence that the end of the data has been reached. NB: The memory buffer in which the binary output is stored is allocated inside this function and has to to be freed (using "delete[]") by the caller! Do not pass a pointer to an already allocated buffer to this function, the caller does not know the exact size anyway.

Parameters

  data | Base64 encoded input data (possibly padded with '=' at the end)
  result | receives pointer to resulting buffer with binary data (big endian encoded)

Returns
  length of the resulting binary data (0 if an error occurred, in this case the buffer is deleted internally)

## ◆ deleteFile()

static OFBool OFStandard::deleteFile | ( | const OFFilename & | filename | ) |
| static

delete given file from filesystem

Parameters

  filename | name of the file (including directory) to delete. This filename may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.

Returns
  OFTrue if deleting the file was successful, OFFalse otherwise. On most systems, the 'errno' variable is also set to a system-specific error code in case of failure.

## ◆ dirExists()

static OFBool OFStandard::dirExists | ( | const OFFilename & | dirName | ) |
| static

check whether the given directory exists.

This function also checks that the specified path points to directory and not to a file (or the like).

Parameters

  dirName | name of the directory to be checked. This directory name may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.

Returns
  OFTrue if directory exists, OFFalse otherwise

## ◆ dropPrivileges()

static OFCondition OFStandard::dropPrivileges | ( |  | ) |
| static

On Posix-like platform, this method executes setuid(getuid()), which causes the application to revert from root privileges to those of the calling user when the program is installed as setuid root.

DCMTK command line tools that open a socket for incoming DICOM network connections will call this method immediately after opening the socket. Since DICOM by default operates on port 104, which on Posix platforms requires root privileges to open, this ensures that the socket can be opened, yet operation continues with the (hopefully) limited rights of the calling user. On non-Posix platforms, this method does nothing and returns success.

Returns
  success or failure. This method can fail if the kernel has been configured to only permit a certain number of processes to be created for each user, and the calling user already has the maximum number of processes running. In this case, the application should terminate since otherwise it would continue to run with full root privileges.

## ◆ encodeBase64() [1/2]

static const OFString & OFStandard::encodeBase64 | ( | const unsigned char * | data,
|  | const size_t | length,
|  | OFString & | result,
|  | const size_t | width = 0 )
| static

encode binary data according to "Base64" as described in RFC 2045 (MIME).

Basic algorithm: groups of 3 bytes from the binary input are coded as groups of 4 bytes in the textual output. The input data is 'padded' with zeros to create a length that is an even multiple of 3. A special character ('=') is used to denote padding so that the output can be decoded back to its exact size. If the input data is NULL an empty string is returned.

Parameters

  data | buffer with binary data to be encoded (big endian required!)
  length | length of the input data buffer (in bytes)
  result | reference to resulting string variable (Base64 encoded)
  width | maximum number of characters per line in the output string (default: 0 = no line breaks, typical for MIME = 72)

Returns
  reference to the resulting string

## ◆ encodeBase64() [2/2]

static OFCondition OFStandard::encodeBase64 | ( | STD_NAMESPACE ostream & | out,
|  | const unsigned char * | data,
|  | const size_t | length,
|  | const size_t | width = 0 )
| static

encode binary data according to "Base64" as described in RFC 2045 (MIME).

Basic algorithm: groups of 3 bytes from the binary input are coded as groups of 4 bytes in the textual output. The input data is 'padded' with zeros to create a length that is an even multiple of 3. A special character ('=') is used to denote padding so that the output can be decoded back to its exact size. If the input data is NULL an error code (EC_IllegalParameter) is returned.

Parameters

  out | output stream used for the base64 encoded data
  data | buffer with binary data to be encoded (big endian required!)
  length | length of the input data buffer (in bytes)
  width | maximum number of characters per line in the output stream (default: 0 = no line breaks, typical for MIME = 72)

Returns
  status, EC_Normal if successful, an error code otherwise

## ◆ extractDigits()

template<typename T, size_t Count>

static T OFStandard::extractDigits | ( | const char * |  | ) |
| static

extracts digits from a string and converts them to the given integer number type.

The result is similar to calling atoi, but extractDigits does not verify all characters are digits and does not require zero terminated strings. It is meant to be used in conjunction with OFStandard::checkDigits(). extractDigits does not handle sign characters ('+' and '-').

Template Parameters

  T | the type of the resulting value, e.g. unsigned int. Must be a valid integer type, i.e. OFnumeric_limits<T>::is_integer must be OFTrue.
  Count | the number of digits to extract. Must be greater zero and less or equal to OFnumeric_limits<T>::digits10
  string | a pointer to a character array to extract digits from.

Returns
  a value of type T that is equivalent to the number represented by the digits.

Warning
  The results are unspecified if the given string contains non-digit characters.

References checkDigits().

## ◆ fileExists()

static OFBool OFStandard::fileExists | ( | const OFFilename & | fileName | ) |
| static

check whether the given file exists.

This function also checks that the specified path points to file and not to a directory (or the like).

Parameters

  fileName | name of the file to be checked. This filename may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.

Returns
  OFTrue if file exists, OFFalse otherwise

## ◆ forceSleep()

static void OFStandard::forceSleep | ( | Uint32 | seconds | ) |
| static

Method that ensures that the current thread is actually sleeping for the defined number of seconds (at least).

The problem with the regular sleep() function called from OFStandard::sleep is that it might be interrupted by signals or a network timeout (depending on the operating system). This methods re-executes OFStandard's sleep method until the desired number of seconds have elapsed.

Parameters

  seconds | The number of seconds to sleep (at least)

## ◆ ftoa()

static void OFStandard::ftoa | ( | char * | target,
|  | size_t | targetSize,
|  | double | value,
|  | unsigned int | flags = 0,
|  | int | width = 0,
|  | int | precision = -1 )
| static

formats a floating-point number into an ASCII string.

This function works similar to sprintf(), except that this implementation is not affected by a locale setting. The radix character is always '.'. This implementation guarantees that the given string size is always respected by using strlcpy to copy the formatted string into the target buffer.

Parameters

  target | pointer to target string buffer
  targetSize | size of target string buffer
  value | double value to be formatted
  flags | processing flags. Any of the flags defined below can be combined by bit-wise or.
  width | width from format (%8d), or 0
  precision | precision from format (%.3d), -1 for default precision, -2, when used with default "%g" format, causes the shortest string to be created that can be converted back to a double equalling "value". With "%e" or "%f" format, prints default precision.

## ◆ getAddressByHostname()

static void OFStandard::getAddressByHostname | ( | const char * | name,
|  | int | protocolFamily,
|  | OFSockAddr & | result )
| static

This function performs a DNS lookup of an IP address based on a hostname.

If a DNS lookup yields multiple IP addresses, only the first one is returned.

Parameters

  name | hostname
  protocolFamily | AF_INET for IPv4, AF_INET6 for IPv6 or AF_UNSPEC for both
  result | a OFSockAddr instance in which the result is stored

## ◆ getDefaultConfigurationDir()

static OFString OFStandard::getDefaultConfigurationDir | ( |  | ) |
| static

retrieve the name of the default directory for configuration files.

On Windows, this method resolves environment variables such as %PROGRAMDATA% in the path, on Posix platforms it just returns DEFAULT_CONFIGURATION_DIR.

Returns
  name of the default directory for configuration files

## ◆ getDefaultSupportDataDir()

static OFString OFStandard::getDefaultSupportDataDir | ( |  | ) |
| static

retrieve the name of the default directory for support data.

On Windows, this method resolves environment variables such as %PROGRAMDATA% in the path, on Posix platforms it just returns DEFAULT_SUPPORT_DATA_DIR.

Returns
  name of the default directory for support data

## ◆ getDirNameFromPath() [1/2]

static OFFilename & OFStandard::getDirNameFromPath | ( | OFFilename & | result,
|  | const OFFilename & | pathName,
|  | const OFBool | assumeDirName = OFTrue )
| static

get directory name component from given path name.

Extracts the substring before the last path separator. If there is no path separator in the given path name, the value of 'pathName' is returned by default; if 'assumeDirName' is OFFalse, an empty string is returned. NB: This function neither checks whether the given 'pathName' exists nor whether the resulting name points to a valid or existing directory.

Parameters

  result | string variable in which the resulting directory name is stored. This name may contain wide characters if support is enabled and 'pathName' contains wide characters. In any case, the resulting string is stored with UTF-8 encoding (8-bit) as an alternative representation.
  pathName | path name from which the directory name should be extracted. This name may contain wide characters if support is enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  assumeDirName | assume that there always is a directory name in 'pathName'

Returns
  reference to the resulting directory name (same as 'result')

## ◆ getDirNameFromPath() [2/2]

static OFString & OFStandard::getDirNameFromPath | ( | OFString & | result,
|  | const OFString & | pathName,
|  | const OFBool | assumeDirName = OFTrue )
| static

get directory name component from given path name.

Extracts the substring before the last path separator. If there is no path separator in the given path name, the value of 'pathName' is returned by default; if 'assumeDirName' is OFFalse, an empty string is returned. NB: This function neither checks whether the given 'pathName' exists nor whether the resulting name points to a valid or existing directory.

Note
  This method is provided for reasons of backward compatibility. Internally, the following method (OFFilename version) is used.

Parameters

  result | string variable in which the resulting directory name is stored
  pathName | path name from which the directory name should be extracted
  assumeDirName | assume that there always is a directory name in 'pathName'

Returns
  reference to the resulting directory name (same as 'result')

## ◆ getFilenameFromPath() [1/2]

static OFFilename & OFStandard::getFilenameFromPath | ( | OFFilename & | result,
|  | const OFFilename & | pathName,
|  | const OFBool | assumeFilename = OFTrue )
| static

get file name component from given path name.

Extracts the substring after the last path separator. If there is no path separator in the given path name, the value of 'pathName' is returned by default; if 'assumeFilename' is OFFalse, an empty string is returned. NB: This function neither checks whether the given 'pathName' exists nor whether the resulting name points to a valid or existing file.

Parameters

  result | string variable in which the resulting file name is stored. This name may contain wide characters if support is enabled and 'pathName' contains wide characters. In any case, the resulting string is stored with UTF-8 encoding (8-bit) as an alternative representation.
  pathName | path name from which the file name should be extracted. This name may contain wide characters if support is enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  assumeFilename | assume that there always is a file name in 'pathName'

Returns
  reference to the resulting file name (same as 'result')

## ◆ getFilenameFromPath() [2/2]

static OFString & OFStandard::getFilenameFromPath | ( | OFString & | result,
|  | const OFString & | pathName,
|  | const OFBool | assumeFilename = OFTrue )
| static

get file name component from given path name.

Extracts the substring after the last path separator. If there is no path separator in the given path name, the value of 'pathName' is returned by default; if 'assumeFilename' is OFFalse, an empty string is returned. NB: This function neither checks whether the given 'pathName' exists nor whether the resulting name points to a valid or existing file.

Note
  This method is provided for reasons of backward compatibility. Internally, the following method (OFFilename version) is used.

Parameters

  result | string variable in which the resulting file name is stored
  pathName | path name from which the file name should be extracted
  assumeFilename | assume that there always is a file name in 'pathName'

Returns
  reference to the resulting file name (same as 'result')

## ◆ getFileSize()

static size_t OFStandard::getFileSize | ( | const OFFilename & | filename | ) |
| static

determine size of given file (in bytes)

Parameters

  filename | name of the file to be checked. This filename may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.

Returns
  size of the file in bytes (0 in case of error)

## ◆ getGrNam()

static OFGroup OFStandard::getGrNam | ( | const char * | name | ) |
| static

Thread-safe version of getgrnam.

Parameters

  name | the group name.

Returns
  a OFStandard::OFGroup object.

## ◆ getHostName()

static OFString OFStandard::getHostName | ( |  | ) |
| static

Retrieve the local domain name, e.

g. 'localhost'.

Returns
  the host name as an OFString value.

## ◆ getHostnameByAddress()

static OFString OFStandard::getHostnameByAddress | ( | const char * | addr,
|  | int | len,
|  | int | type )
| static

This function performs a reverse DNS lookup of a hostname.

The parameters are identical to those passed to gethostbyaddr(). If the lookup fails, an empty string is returned.

Parameters

  addr | IP address, actually a pointer to a struct in_addr or a struct in6_addr object
  len | length of the struct pointed to by addr
  type | address type, either AF_INET or AF_INET6

Returns
  hostname for the IP address

## ◆ getLastNetworkErrorCode()

static OFerror_code OFStandard::getLastNetworkErrorCode | ( |  | ) |
| static

Retrieve the last network specific error code that was emitted in the calling thread.

The current implementation uses errno on POSIX-like platforms and WSAGetLastError() on Windows.

Returns
  the last error code as OFerror_code object.

## ◆ getLastSystemErrorCode()

static OFerror_code OFStandard::getLastSystemErrorCode | ( |  | ) |
| static

Retrieve the last operating system error code that was emitted in the calling thread.

The current implementation uses errno on POSIX-like platforms and GetLastError() on Windows.

Returns
  the last error code as OFerror_code object.

## ◆ getProcessID()

static long OFStandard::getProcessID | ( |  | ) |
| static

Determines the identification of the running process.

Returns
  the process ID of the currently running process.

## ◆ getPwNam()

static OFPasswd OFStandard::getPwNam | ( | const char * | name | ) |
| static

Thread-safe version of getpwnam.

Parameters

  name | the username.

Returns
  a OFStandard::OFPasswd object.

## ◆ getUserName()

static OFString OFStandard::getUserName | ( |  | ) |
| static

Retrieve the name of the user that started the current process.

Returns
  the user name as an OFString value.

## ◆ initializeNetwork()

static void OFStandard::initializeNetwork | ( |  | ) |
| static

Initialize the network API (if necessary), e.g. Winsock.

Calls the appropriate network initialization routines for the current platform, e.g. WSAStartup().

Note
  This function must be called by an application before any network related functions are used, be it listening on a socket or just retrieving the current host name. Not all platforms require calling a network initialization routine, therefore testing if it works to determine if this method must be called is not an option – just always ensure to call it at program startup if the application does something network related!

## ◆ isReadable()

static OFBool OFStandard::isReadable | ( | const OFFilename & | pathName | ) |
| static

check whether the given path is readable.

This function works for both files and directories.

Parameters

  pathName | name of the path to be checked. This path name may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.

Returns
  OFTrue if path is readable, OFFalse otherwise

## ◆ isspace()

static bool OFStandard::isspace | ( | char | ch | ) |
| static

check if the character is a whitespace character assuming the C locale.

The standard isspace function is locale-dependent, which is slow and may lead to surprising behavior. Further, it is undefined for char values -127 to 0, requiring the caller to cast the argument to unsigned char.

Parameters

  ch | the character to check

Returns
  true if the character is a whitespace character, false otherwise

## ◆ isWriteable()

static OFBool OFStandard::isWriteable | ( | const OFFilename & | pathName | ) |
| static

check whether the given path is writeable.

This function works for both files and directories.

Parameters

  pathName | name of the path to be checked. This path name may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.

Returns
  OFTrue if path is writeable, OFFalse otherwise

## ◆ milliSleep()

static void OFStandard::milliSleep | ( | unsigned int | millisecs | ) |
| static

makes the current process sleep until the given number of milliseconds have elapsed or a signal which is not ignored arrives

Parameters

  millisecs | number of milliseconds to sleep

## ◆ my_sleep()

static unsigned int OFStandard::my_sleep | ( | unsigned int | seconds | ) |
| staticprivate

makes the current process sleep until seconds seconds have elapsed or a signal arrives which is not ignored

Parameters

  seconds | number of seconds to sleep

Returns
  zero if the requested time has elapsed, or the number of seconds left to sleep

Referenced by sleep().

## ◆ my_strlcat()

static size_t OFStandard::my_strlcat | ( | char * | dst,
|  | const char * | src,
|  | size_t | siz )
| staticprivate

private implementation of strlcat.

Called when strlcat is not available in the standard library.

Parameters

  dst | destination buffer of size siz, must not be NULL
  src | source string, must not be NULL
  siz | size of destination buffer

Returns
  the total length of the string the function tried to create, i.e. the initial length of dst plus the length of src

Referenced by strlcat().

## ◆ my_strlcpy()

static size_t OFStandard::my_strlcpy | ( | char * | dst,
|  | const char * | src,
|  | size_t | siz )
| staticprivate

private implementation of strlcpy.

Called when strlcpy is not available in the standard library.

Parameters

  dst | destination buffer of size siz, must not be NULL
  src | source string, must not be NULL
  siz | size of destination buffer

Returns
  the total length of the string the function tried to create, i.e. strlen(src)

Referenced by strlcpy().

## ◆ normalizeDirName() [1/2]

static OFFilename & OFStandard::normalizeDirName | ( | OFFilename & | result,
|  | const OFFilename & | dirName,
|  | const OFBool | allowEmptyDirName = OFFalse )
| static

normalize the given directory name.

Removes trailing path separators from the directory name. If the resulting directory name is an empty string and the flag 'allowEmptyDirName' is OFFalse the directory name is set to "." (current directory). If the resulting directory name is "." and the flag 'allowEmptyDirName' is OFTrue the directory name is set to an empty string.

Parameters

  result | string variable in which the resulting directory name is stored. This name may contain wide characters if support is enabled and 'dirName' contains wide characters. In any case, the resulting string is stored with UTF-8 encoding (8-bit) as an alternative representation.
  dirName | directory name to be normalized. This name may contain wide characters if support is enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  allowEmptyDirName | flag indicating whether an empty directory name is allowed

Returns
  reference to the resulting directory name (same as 'result')

## ◆ normalizeDirName() [2/2]

static OFString & OFStandard::normalizeDirName | ( | OFString & | result,
|  | const OFString & | dirName,
|  | const OFBool | allowEmptyDirName = OFFalse )
| static

normalize the given directory name.

Removes trailing path separators from the directory name. If the resulting directory name is an empty string and the flag 'allowEmptyDirName' is OFFalse the directory name is set to "." (current directory). If the resulting directory name is "." and the flag 'allowEmptyDirName' is OFTrue the directory name is set to an empty string.

Note
  This method is provided for reasons of backward compatibility. Internally, the following method (OFFilename version) is used.

Parameters

  result | string variable in which the resulting directory name is stored
  dirName | directory name to be normalized
  allowEmptyDirName | flag indicating whether an empty directory name is allowed

Returns
  reference to the resulting directory name (same as 'result')

## ◆ pathExists()

static OFBool OFStandard::pathExists | ( | const OFFilename & | pathName | ) |
| static

check whether the given path exists.

This function does not distinguish files from directories (use 'fileExists()' or 'directoryExists()' if required).

Parameters

  pathName | name of the path to be checked. This path name may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.

Returns
  OFTrue if path exists, OFFalse otherwise

## ◆ removeRootDirFromPathname()

static OFCondition OFStandard::removeRootDirFromPathname | ( | OFFilename & | result,
|  | const OFFilename & | rootDir,
|  | const OFFilename & | pathName,
|  | const OFBool | allowLeadingPathSeparator = OFTrue )
| static

remove root directory prefix from given path name.

In case 'pathName' starts with 'rootDir', the common prefix is removed. Otherwise, an empty string is returned (or a cleared OFFilename in case of error).

Parameters

  result | string variable in which the resulting path name is stored. This name may contain wide characters if support is enabled and 'rootDir' as well as 'pathName' contain wide characters. In any case, the resulting string is stored with UTF-8 encoding (8-bit) as an alternative representation.
  rootDir | name of the root directory to be removed. This name may contain wide characters if support is enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  pathName | path name from which the root directory (prefix) is removed. Should contain wide characters if and only if 'rootDir' contains wide characters.
  allowLeadingPathSeparator | flag indicating whether a leading path separator is allowed for the resulting path name (automatically removed otherwise)

Returns
  status, EC_Normal if successful, an error code otherwise

## ◆ renameFile()

static OFBool OFStandard::renameFile | ( | const OFFilename & | oldFilename,
|  | const OFFilename & | newFilename )
| static

change name of a given file

Parameters

  oldFilename | current name of the file (including directory) to be renamed. This filename may contain wide characters if support enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  newFilename | new name of the file (including directory), i.e. after renaming. Should contain wide characters if and only if 'oldFilename' contains wide characters.

Returns
  OFTrue if changing the name was successful, OFFalse otherwise. On most systems, the 'errno' variable is also set to a system-specific error code in case of failure.

## ◆ safeAdd()

template<typename T>

static OFBool OFStandard::safeAdd | ( | T | a,
|  | T | b,
|  | T & | sum )
| inlinestatic

check whether addition is safe (i.e. no overflow occurs) and if so, perform it (i.e. compute a+b=sum).

Only works for unsigned types.

Parameters

  a | first number to add
  b | second number to add
  sum | resulting sum of both numbers, if addition is safe, otherwise parameter value is not touched by the function

Returns
  OFTrue if addition is safe and could be performed, OFFalse otherwise

## ◆ safeMult()

template<typename T>

static OFBool OFStandard::safeMult | ( | T | a,
|  | T | b,
|  | T & | product )
| inlinestatic

check whether multiplication is safe (i.e. no overflow occurs) and if so, perform it (i.e. compute a*b=product).

Only works for unsigned types.

Parameters

  a | first number to multiply
  b | second number to multiply
  product | resulting product of both numbers, if multiplication is safe, otherwise parameter value is not touched by the function

Returns
  OFTrue if multiplication is safe and could be performed, OFFalse otherwise

## ◆ safeSubtract()

template<typename T>

static OFBool OFStandard::safeSubtract | ( | T | minuend,
|  | T | subtrahend,
|  | T & | difference )
| inlinestatic

check whether subtraction is safe (i.e. no underflow occurs) and if so, perform it (i.e. compute minuend-subtrahend=difference).

Only works for unsigned types.

Parameters

  minuend | number to subtract from
  subtrahend | number to subtract from minuend
  difference | difference, if subtraction is safe, otherwise the parameter value is not touched by the function

Returns
  OFTrue if subtraction is safe and could be performed, OFFalse otherwise

## ◆ sanitizeFilename() [1/2]

static void OFStandard::sanitizeFilename | ( | char * | fname | ) |
| static

sanitize a filename (NOT a path name!) by replacing all path separators with underscores.

This avoids possible path traversal vulnerabilities if malformed data read from file or received over a network is used as part of a filename.

Parameters

  fname | filename to be sanitized

## ◆ sanitizeFilename() [2/2]

static void OFStandard::sanitizeFilename | ( | OFString & | fname | ) |
| static

sanitize a filename (NOT a path name!) by replacing all path separators with underscores.

This avoids possible path traversal vulnerabilities if malformed data read from file or received over a network is used as part of a filename.

Parameters

  fname | filename to be sanitized

## ◆ searchDirectoryRecursively() [1/2]

static size_t OFStandard::searchDirectoryRecursively | ( | const OFFilename & | directory,
|  | OFList< OFFilename > & | fileList,
|  | const OFFilename & | pattern,
|  | const OFFilename & | dirPrefix,
|  | const OFBool | recurse = OFTrue )
| static

scan a given directory (recursively) and add all filenames found to a list

Parameters

  directory | name of the directory to be scanned. This name may contain wide characters if support is enabled. Since there are various constructors for the OFFilename class, a "char *", "OFString" or "wchar_t *" can also be passed directly to this parameter.
  fileList | list to which the filenames are added. These names may contain wide characters if support is enabled and 'directory' contains wide characters. In any case, the resulting string is stored with UTF-8 encoding (8-bit) as an alternative representation. Please note that the list is not not cleared automatically before new entries are added.
  pattern | wildcard pattern used to match the filenames against. Should contain wide characters if and only if 'directory' contains wide characters. An empty pattern matches all files. In order to work under Unix the system function fnmatch() is required.
  dirPrefix | prefix added to the directory name. Should contain wide characters if and only if 'directory' contains wide characters. This prefix will, however, not be part of the filenames added to the list.
  recurse | flag indicating whether to search recursively (default) or not

Returns
  number of new files added to the list

## ◆ searchDirectoryRecursively() [2/2]

static size_t OFStandard::searchDirectoryRecursively | ( | const OFString & | directory,
|  | OFList< OFString > & | fileList,
|  | const OFString & | pattern = "",
|  | const OFString & | dirPrefix = "",
|  | const OFBool | recurse = OFTrue )
| static

scan a given directory (recursively) and add all filenames found to a list

Note
  This method is provided for reasons of backward compatibility. Internally, the following method (OFFilename version) is used.

Parameters

  directory | name of the directory to be scanned
  fileList | list to which the filenames are added. Please note that the list is not not cleared automatically before new entries are added.
  pattern | optional wildcard pattern used to match the filenames against. By default all files match. In order to work under Unix the system function fnmatch() is required.
  dirPrefix | optional prefix added to the directory name. This prefix will, however, not be part of the filenames added to the list.
  recurse | flag indicating whether to search recursively (default) or not

Returns
  number of new files added to the list

## ◆ shutdownNetwork()

static void OFStandard::shutdownNetwork | ( |  | ) |
| static

Shutdown the network API (if necessary), e.g. Winsock.

Calls the appropriate network shutdown routines to free used resources (e.g. WSACleanup()).

## ◆ sleep()

static unsigned int OFStandard::sleep | ( | unsigned int | seconds | ) |
| inlinestatic

makes the current process sleep until seconds seconds have elapsed or a signal arrives which is not ignored

Parameters

  seconds | number of seconds to sleep

Returns
  zero if the requested time has elapsed, or the number of seconds left to sleep

References my_sleep().

## ◆ snprintf()

static int OFStandard::snprintf | ( | char * | str,
|  | size_t | size,
|  | const char * | format,
|  |  | ... )
| static

Standard C99 formatted string output function.

This is an implementation of the snprintf(3) function as defined in the C99 standard. Like all functions of the printf() family, it produces output according to a format string. Output is written to the character array passed as parameter str. The function never writes more than size bytes and guarantees that the result will be NUL terminated, although it may be truncated if the buffer provided is too small.

Parameters

  str | string buffer to write to
  size | size of string buffer, in bytes
  format | printf() format string
  ... | parameters to be formatted

Returns
  number of characters that have been written (if the buffer is large enough) or the number of characters that would have been written (if the buffer is too small), in both cases not including the final NUL character.

## ◆ strerror()

static const char * OFStandard::strerror | ( | const int | errnum,
|  | char * | buf,
|  | const size_t | buflen )
| static

convert a given error code to a string.

This function wraps the various approaches found on different systems. Internally, the standard function strerror() or strerror_r() is used.

Parameters

  errnum | error code to be converted
  buf | buffer which is used to store the result string (if supported)
  buflen | size if the buffer in bytes

Returns
  pointer to string describing the error code. Please note that depending on the implementation of the function used, the result may or may not be a pointer to buf. The return value can also be NULL if the buffer is invalid.

Referenced by OFFile::getLastErrorString().

## ◆ strlcat()

static size_t OFStandard::strlcat | ( | char * | dst,
|  | const char * | src,
|  | size_t | siz )
| inlinestatic

This function appends the NUL-terminated string src to the end of dst.

It will append at most size - strlen(dst) - 1 bytes, NUL- terminating the result. It is designed to be a safer, more consistent, and less error-prone replacement for strncat(3). strlcat takes the full size of the buffer (not just the length) and guarantees to NUL-terminate the result (as long as size is larger than 0). Note that you should include a byte for the NUL in size. Also note that strlcat only operates on true C strings, i. e. dst and src must be NUL-terminated.

Parameters

  dst | destination buffer of size siz, must not be NULL
  src | source string, must not be NULL
  siz | size of destination buffer

Returns
  the total length of the string the function tried to create, i.e. the initial length of dst plus the length of src. While this may seem somewhat confusing it was done to make truncation detection simple.

References my_strlcat().

## ◆ strlcpy()

static size_t OFStandard::strlcpy | ( | char * | dst,
|  | const char * | src,
|  | size_t | siz )
| inlinestatic

This function copies up to size - 1 characters from the NUL- terminated string src to dst, NUL-terminating the result.

It is designed to be a safer, more consistent, and less error-prone replacement for strncpy(3). strlcpy takes the full size of the buffer (not just the length) and guarantees to NUL-terminate the result (as long as size is larger than 0). Note that you should include a byte for the NUL in size. Also note that strlcpy only operates on true C strings, i. e. src must be NUL-terminated.

Parameters

  dst | destination buffer of size siz, must not be NULL
  src | source string, must not be NULL
  siz | size of destination buffer

Returns
  the total length of the string the function tried to create, i.e. strlen(src). While this may seem somewhat confusing it was done to make truncation detection simple.

References my_strlcpy().

## ◆ toLower() [1/2]

static OFString & OFStandard::toLower | ( | OFString & | result,
|  | const OFString & | value )
| static

returns the lower-case version of a given string

Parameters

  result | string variable in which the result is stored
  value | string value to be converted to lower case

Returns
  reference to the resulting string (same as 'result')

## ◆ toLower() [2/2]

static OFString & OFStandard::toLower | ( | OFString & | value | ) |
| static

returns the lower-case version of a given string.

NB: This function changes the parameter 'value'.

Parameters

  value | string value to be converted to lower case

Returns
  reference to the resulting string (same as 'value')

## ◆ toUpper() [1/2]

static OFString & OFStandard::toUpper | ( | OFString & | result,
|  | const OFString & | value )
| static

returns the upper-case version of a given string

Parameters

  result | string variable in which the result is stored
  value | string value to be converted to upper case

Returns
  reference to the resulting string (same as 'result')

## ◆ toUpper() [2/2]

static OFString & OFStandard::toUpper | ( | OFString & | value | ) |
| static

returns the upper-case version of a given string.

NB: This function changes the parameter 'value'.

Parameters

  value | string value to be converted to upper case

Returns
  reference to the resulting string (same as 'value')

## ◆ trimString() [1/2]

static void OFStandard::trimString | ( | const char *& | pBegin,
|  | const char *& | pEnd )
| static

An utility function that finds a substring within a string that does not contain leading and trailing spaces and null bytes, effectively trimming the string without unnecessary copies.

Parameters

  pBegin | a reference to a pointer to the beginning of the string.
  pEnd | a reference to a pointer to the end of the string (the first byte behind the string).

Precondition
  pBegin <= pEnd

trimString() increments pBegin and decrements pEnd until either both point to a non-null and non-space character (the position after it in case of pEnd) or both become equal (in case the string only contains spaces and null bytes).

## ◆ trimString() [2/2]

static void OFStandard::trimString | ( | const char *& | str,
|  | size_t & | size )
| static

An utility function that finds a substring within a string that does not contain leading and trailing spaces and null bytes, effectively trimming the string without unnecessary copies.

Parameters

  str | a reference to a pointer to the beginning of the string.
  size | a reference to a size_t variable containing the number of bytes in the string referenced by str.

This overload is implemented using the other overload of the function operating on two character pointers.

## ◆ vsnprintf()

static int OFStandard::vsnprintf | ( | char * | str,
|  | size_t | size,
|  | const char * | format,
|  | va_list | ap )
| static

Standard C99 formatted string output function.

This is an implementation of the snprintf(3) function as defined in the C99 standard. Like all functions of the printf() family, it produces output according to a format string. Output is written to the character array passed as parameter str. The function never writes more than size bytes and guarantees that the result will be NUL terminated, although it may be truncated if the buffer provided is too small.

Parameters

  str | string buffer to write to
  size | size of string buffer, in bytes
  format | printf() format string
  ap | parameters to be formatted

Returns
  number of characters that have been written (if the buffer is large enough) or the number of characters that would have been written (if the buffer is too small), in both cases not including the final NUL character.

## Member Data Documentation

## ◆ ftoa_alternate

const unsigned int OFStandard::ftoa_alternate
| static

convert value to alternate form.

The result will always contain a decimal point, even if no digits follow the point.

## ◆ ftoa_format_e

const unsigned int OFStandard::ftoa_format_e
| static

Use scientific format (equivalent to e or E in printf), instead of the default, which is equivalent to g or G.

If both ftoa_format_e and ftoa_format_f are specified, ftoa_format_e format is used.

The documentation for this class was generated from the following file:

- ofstd/include/dcmtk/ofstd/ofstd.h

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