/usr/include/dcmtk/ofstd/ofchrenc.h is in libdcmtk-dev 3.6.1~20150924-5.
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*
* Copyright (C) 2011-2012, OFFIS e.V.
* All rights reserved. See COPYRIGHT file for details.
*
* This software and supporting documentation were developed by
*
* OFFIS e.V.
* R&D Division Health
* Escherweg 2
* D-26121 Oldenburg, Germany
*
*
* Module: ofstd
*
* Author: Joerg Riesmeier
*
* Purpose: Class for character encoding conversion (Header)
*
*/
#ifndef OFCHRENC_H
#define OFCHRENC_H
#include "dcmtk/config/osconfig.h"
#include "dcmtk/ofstd/ofcond.h"
#include "dcmtk/ofstd/ofstring.h"
/*---------------------*
* class declaration *
*---------------------*/
/** A class for managing and converting between different character encodings.
* The implementation relies on the libiconv toolkit (if available).
*/
class DCMTK_OFSTD_EXPORT OFCharacterEncoding
{
// allow the DICOM-specific character set class to access protected methods
friend class DcmSpecificCharacterSet;
public:
/** constructor. Initializes the member variables, which includes the
* current locale's character encoding.
*/
OFCharacterEncoding();
/** destructor
*/
~OFCharacterEncoding();
/** clear the internal state. This also closes the conversion descriptor
* if it was allocated before, so selectEncoding() has to be called again
* before a string can be converted to a new character encoding.
*/
void clear();
/** get mode specifying whether a character that cannot be represented in
* the destination character encoding is approximated through one or more
* characters that look similar to the original one
* @return current value of the mode. OFTrue means that the mode is
* enabled, OFFalse means disabled.
*/
OFBool getTransliterationMode() const;
/** get mode specifying whether characters that cannot be represented in
* the destination character encoding will be silently discarded
* @return current value of the mode. OFTrue means that the mode is
* enabled, OFFalse means disabled.
*/
OFBool getDiscardIllegalSequenceMode() const;
/** set mode specifying whether a character that cannot be represented in
* the destination character encoding is approximated through one or more
* characters that look similar to the original one. By default, this
* mode is disabled.
* @param mode enable mode by OFTrue or disable it by OFFalse
* @return status, EC_Normal if successful, an error code otherwise
*/
OFCondition setTransliterationMode(const OFBool mode);
/** set mode specifying whether characters that cannot be represented in
* the destination character encoding will be silently discarded. By
* default, this mode is disabled.
* @param mode enable mode by OFTrue or disable it by OFFalse
* @return status, EC_Normal if successful, an error code otherwise
*/
OFCondition setDiscardIllegalSequenceMode(const OFBool mode);
/** get the current locale's character encoding
* @return the current locale's character encoding
*/
const OFString &getLocaleEncoding() const;
/** updates the current locale's character encoding. This is only needed
* if the locale setting changed during the lifetime of this object,
* because the current locale's character encoding is always determined
* in the constructor. If possible the canonical encoding names listed
* in "config.charset" (see libiconv toolkit) are used.
* @return status, EC_Normal if successful, an error code otherwise
*/
OFCondition updateLocaleEncoding();
/** select source and destination character encoding for subsequent
* conversion(s). The encoding names can be found in the documentation
* of the libiconv toolkit. Typical names are "ASCII", "ISO-8859-1" and
* "UTF-8". An empty string denotes the locale dependent character
* encoding (see getLocaleEncoding()).
* @param fromEncoding name of the source character encoding
* @param toEncoding name of the destination character encoding
* @return status, EC_Normal if successful, an error code otherwise
*/
OFCondition selectEncoding(const OFString &fromEncoding,
const OFString &toEncoding);
/** convert the given string between the selected character encodings.
* That means selectEncoding() has to be called prior to this method.
* @param fromString input string to be converted (using the source
* character encoding)
* @param toString reference to variable where the converted string
* (using the destination character encoding) is
* stored (or appended, see parameter 'clearMode')
* @param clearMode flag indicating whether to clear the variable
* 'toString' before appending the converted string
* @return status, EC_Normal if successful, an error code otherwise
*/
OFCondition convertString(const OFString &fromString,
OFString &toString,
const OFBool clearMode = OFTrue);
/** convert the given string between the selected character encodings.
* That means selectEncoding() has to be called prior to this method.
* Since the length of the input string has to be specified explicitly,
* the string can contain more than one NULL byte.
* @param fromString input string to be converted (using the source
* character encoding). A NULL pointer is regarded
* as an empty string.
* @param fromLength length of the input string (number of bytes without
* the trailing NULL byte)
* @param toString reference to variable where the converted string
* (using the destination character encoding) is
* stored (or appended, see parameter 'clearMode')
* @param clearMode flag indicating whether to clear the variable
* 'toString' before appending the converted string
* @return status, EC_Normal if successful, an error code otherwise
*/
OFCondition convertString(const char *fromString,
const size_t fromLength,
OFString &toString,
const OFBool clearMode = OFTrue);
#ifdef HAVE_WINDOWS_H
/** @name code page definitions.
* Short list of common code page identifiers used for the conversion to
* and from Windows-specific wide character encoding (UTF-16).
* For further code pages, please refer to the MSDN documentation on
* "Code Page Identifiers".
*/
//@{
/// system default Windows ANSI code page. See Windows function GetACP().
static const unsigned int CPC_ANSI;
/// current system OEM code page. See Windows function GetOEMCP().
static const unsigned int CPC_OEM;
/// code page for US-ASCII (7-bit)
static const unsigned int CPC_ASCII;
/// code page for ISO 8859-1 (Latin-1)
static const unsigned int CPC_Latin1;
/// code page for UTF-8
static const unsigned int CPC_UTF8;
//@}
// --- static Windows-specific functions ---
/** convert the given string between Windows-specific wide character
* encoding (UTF-16) and the specified code page. In contrast to
* convertString(), no special character encoding library is needed,
* but on the other hand it only works on Windows systems.
* Please note that no conversion flags are specified for the internal
* call to the WideCharToMultiByte() function.
* Since the length of the input string has to be specified explicitly,
* the string can contain more than one NULL character.
* @param fromString input string to be converted (using the UTF-16
* character encoding). A NULL pointer is regarded
* as an empty string.
* @param fromLength length of the input string (number of characters
* without the trailing NULL character)
* @param toString reference to variable where the converted string
* (using the character encoding specified by
* 'codePage') is stored (or appended, see parameter
* 'clearMode')
* @param codePage identifier of the code page to be used for the
* conversion (default: UTF-8)
* @param clearMode flag indicating whether to clear the variable
* 'toString' before appending the converted string
* @return status, EC_Normal if successful, an error code otherwise
*/
static OFCondition convertFromWideCharString(const wchar_t *fromString,
const size_t fromLength,
OFString &toString,
const unsigned int codePage = CPC_UTF8,
const OFBool clearMode = OFTrue);
/** convert the given string between the specified code page and the
* Windows-specific wide character encoding (UTF-16). In contrast to
* convertString(), no special character encoding library is needed, but
* on the other hand it only works on Windows systems.
* Please note that no conversion flags are specified for the internal
* call to the MultiByteToWideChar() function.
* @param fromString input string to be converted (using character
* encoding specified by 'codePage')
* @param toString reference to variable in which the pointer to the
* converted string (using the UTF-16 character
* encoding) is stored. Might be NULL in case of
* error. Please note that the buffer is created
* with new[] and has to be deleted by the caller.
* @param toLength number of converted characters, i.e.\ length of
* 'toString'
* @param codePage identifier of the code page to be used for the
* conversion (default: UTF-8)
* @return status, EC_Normal if successful, an error code otherwise
*/
static OFCondition convertToWideCharString(const OFString &fromString,
wchar_t *&toString,
size_t &toLength,
const unsigned int codePage = CPC_UTF8);
/** convert the given string between the specified code page and the
* Windows-specific wide character encoding (UTF-16). In contrast to
* convertString(), no special character encoding library is needed, but
* on the other hand it only works on Windows systems.
* Please note that no conversion flags are specified for the internal
* call to the MultiByteToWideChar() function.
* Since the length of the input string has to be specified explicitly,
* the string can contain more than one NULL byte.
* @param fromString input string to be converted (using the character
* encoding specified by 'codePage'). A NULL pointer
* is regarded as an empty string.
* @param fromLength length of the input string (number of bytes
* without the trailing NULL byte)
* @param toString reference to variable in which the pointer to the
* converted string (using the UTF-16 character
* encoding) is stored. Might be NULL in case of
* error. Please note that the buffer is created
* with new[] and has to be deleted by the caller.
* @param toLength number of converted characters, i.e.\ length of
* 'toString'
* @param codePage identifier of the code page to be used for the
* conversion (default: UTF-8)
* @return status, EC_Normal if successful, an error code otherwise
*/
static OFCondition convertToWideCharString(const char *fromString,
const size_t fromLength,
wchar_t *&toString,
size_t &toLength,
const unsigned int codePage = CPC_UTF8);
#endif // HAVE_WINDOWS_H
// --- static helper functions ---
/** check whether the underlying character encoding library is available.
* If the library is not available, no conversion between different
* character encodings will be possible (apart from the Windows-specific
* wide character conversion functions).
* @return OFTrue if the character encoding library is available, OFFalse
* otherwise
*/
static OFBool isLibraryAvailable();
/** get version information of the underlying character encoding library.
* Typical output format: "LIBICONV, Version 1.14". If the library is not
* available the output is: "<no character encoding library available>"
* @return name and version number of the character encoding library
*/
static OFString getLibraryVersionString();
/** count characters in given UTF-8 string and return the resulting number
* of so-called "code points". Please note that invalid UTF-8 encodings
* are not handled properly. ASCII strings (7-bit) are also supported,
* although OFString::length() is probably much faster.
* @param utf8String valid character string with UTF-8 encoding
* @return number of characters (code points) in given UTF-8 string
*/
static size_t countCharactersInUTF8String(const OFString &utf8String);
protected:
/// type of the conversion descriptor (used by libiconv)
typedef void* T_Descriptor;
/** allocate conversion descriptor for the given source and destination
* character encoding. Please make sure that the descriptor is
* deallocated with closeDescriptor() when not needed any longer.
* @param descriptor reference to variable where the newly allocated
* conversion descriptor is stored
* @param fromEncoding name of the source character encoding
* @param toEncoding name of the destination character encoding
* @return status, EC_Normal if successful, an error code otherwise
*/
OFCondition openDescriptor(T_Descriptor &descriptor,
const OFString &fromEncoding,
const OFString &toEncoding);
/** deallocate the given conversion descriptor that was previously
* allocated with openDescriptor(). Please do not pass arbitrary values
* to this method, since this will result in a segmentation fault.
* @param descriptor conversion descriptor to be closed. After the
* descriptor has been deallocated, 'descriptor' is
* set to an invalid value - see isDescriptorValid().
* @return status, EC_Normal if successful, an error code otherwise. In
* case an invalid descriptor is passed, it is not regarded as an error.
*/
OFCondition closeDescriptor(T_Descriptor &descriptor);
/** check whether the given conversion descriptor is valid, i.e.\ has been
* allocated by a previous call to openDescriptor()
* @param descriptor conversion descriptor to be checked
* @return OFTrue if the conversion descriptor is valid, OFFalse otherwise
*/
OFBool isDescriptorValid(const T_Descriptor descriptor);
/** convert the given string between the specified character encodings.
* Since the length of the input string has to be specified explicitly,
* the string can contain more than one NULL byte.
* @param descriptor previously allocated conversion descriptor to be
* used for the conversion of the character encodings
* @param fromString input string to be converted (using the source
* character encoding). A NULL pointer is regarded
* as an empty string.
* @param fromLength length of the input string (number of bytes without
* the trailing NULL byte)
* @param toString reference to variable where the converted string
* (using the destination character encoding) is
* stored (or appended, see parameter 'clearMode')
* @param clearMode flag indicating whether to clear the variable
* 'toString' before appending the converted string
* @return status, EC_Normal if successful, an error code otherwise
*/
OFCondition convertString(T_Descriptor descriptor,
const char *fromString,
const size_t fromLength,
OFString &toString,
const OFBool clearMode = OFTrue);
private:
// private undefined copy constructor
OFCharacterEncoding(const OFCharacterEncoding &);
// private undefined assignment operator
OFCharacterEncoding &operator=(const OFCharacterEncoding &);
// --- static helper functions ---
/** create an error condition based on the current value of "errno" and the
* given parameters. The function OFStandard::strerror() is used to map
* the numerical value of the error to a textual description.
* @param status reference to variable where the condition is stored
* @param message message text that is used as a prefix to strerror()
* @param code unique status code of the error condition
*/
static void createErrnoCondition(OFCondition &status,
OFString message,
const unsigned short code);
#ifdef HAVE_WINDOWS_H
/** create an error condition based on the return value of "getLastError()"
* and the given parameters. The Windows function FormatMessage() is used
* to map the numerical value of the error to a textual description.
* @param status reference to variable where the condition is stored
* @param message message text that is used as a prefix to the error
* @param code unique status code of the error condition
*/
static void createGetLastErrorCondition(OFCondition &status,
OFString message,
const unsigned short code);
#endif // HAVE_WINDOWS_H
/// current locale's character encoding
OFString LocaleEncoding;
/// conversion descriptor used by libiconv
T_Descriptor ConversionDescriptor;
/// transliteration mode (default: disabled)
OFBool TransliterationMode;
/// discard illegal sequence mode (default: disabled)
OFBool DiscardIllegalSequenceMode;
};
#endif
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