encoding

encoding - interface for the encoding conversion functions

interface for the encoding conversion functions needed for XML basic encoding and iconv() support. Related specs are rfc2044 (UTF-8 and UTF-16) F. Yergeau Alis Technologies [ISO-10646] UTF-8 and UTF-16 in Annexes [ISO-8859-1] ISO Latin-1 characters codes. [UNICODE] The Unicode Consortium, "The Unicode Standard -- Worldwide Character Encoding -- Version 1.0", Addison- Wesley, Volume 1, 1991, Volume 2, 1992. UTF-8 is described in Unicode Technical Report #4. [US-ASCII] Coded Character Set--7-bit American Standard Code for Information Interchange, ANSI X3.4-1986.

Author(s): Daniel Veillard

Synopsis

typedef enum xmlCharEncError;
typedef enum xmlCharEncoding;
typedef struct _xmlCharEncodingHandler xmlCharEncodingHandler;
typedef xmlCharEncodingHandler * xmlCharEncodingHandlerPtr;
int	UTF8Toisolat1			(unsigned char * out, 
int * outlen,
const unsigned char * in,
int * inlen); int isolat1ToUTF8 (unsigned char * out,
int * outlen,
const unsigned char * in,
int * inlen); int xmlAddEncodingAlias (const char * name,
const char * alias); int xmlCharEncCloseFunc (xmlCharEncodingHandler * handler); int xmlCharEncFirstLine (xmlCharEncodingHandler * handler,
xmlBufferPtr out,
xmlBufferPtr in); int xmlCharEncInFunc (xmlCharEncodingHandler * handler,
xmlBufferPtr out,
xmlBufferPtr in); int xmlCharEncOutFunc (xmlCharEncodingHandler * handler,
xmlBufferPtr out,
xmlBufferPtr in); typedef int xmlCharEncodingInputFunc (unsigned char * out,
int * outlen,
const unsigned char * in,
int * inlen); typedef int xmlCharEncodingOutputFunc (unsigned char * out,
int * outlen,
const unsigned char * in,
int * inlen); void xmlCleanupCharEncodingHandlers (void); void xmlCleanupEncodingAliases (void); int xmlDelEncodingAlias (const char * alias); xmlCharEncoding xmlDetectCharEncoding (const unsigned char * in,
int len); xmlCharEncodingHandlerPtr xmlFindCharEncodingHandler (const char * name); xmlCharEncodingHandlerPtr xmlGetCharEncodingHandler (xmlCharEncoding enc); const char * xmlGetCharEncodingName (xmlCharEncoding enc); const char * xmlGetEncodingAlias (const char * alias); void xmlInitCharEncodingHandlers (void); xmlCharEncodingHandlerPtr xmlNewCharEncodingHandler (const char * name,
xmlCharEncodingInputFunc input,
xmlCharEncodingOutputFunc output); xmlCharEncoding xmlParseCharEncoding (const char * name); void xmlRegisterCharEncodingHandler (xmlCharEncodingHandlerPtr handler);

Description

Details


Enum xmlCharEncoding

enum xmlCharEncoding {
    XML_CHAR_ENCODING_ERROR = -1 /* No char encoding detected */
    XML_CHAR_ENCODING_NONE = 0 /* No char encoding detected */
    XML_CHAR_ENCODING_UTF8 = 1 /* UTF-8 */
    XML_CHAR_ENCODING_UTF16LE = 2 /* UTF-16 little endian */
    XML_CHAR_ENCODING_UTF16BE = 3 /* UTF-16 big endian */
    XML_CHAR_ENCODING_UCS4LE = 4 /* UCS-4 little endian */
    XML_CHAR_ENCODING_UCS4BE = 5 /* UCS-4 big endian */
    XML_CHAR_ENCODING_EBCDIC = 6 /* EBCDIC uh! */
    XML_CHAR_ENCODING_UCS4_2143 = 7 /* UCS-4 unusual ordering */
    XML_CHAR_ENCODING_UCS4_3412 = 8 /* UCS-4 unusual ordering */
    XML_CHAR_ENCODING_UCS2 = 9 /* UCS-2 */
    XML_CHAR_ENCODING_8859_1 = 10 /* ISO-8859-1 ISO Latin 1 */
    XML_CHAR_ENCODING_8859_2 = 11 /* ISO-8859-2 ISO Latin 2 */
    XML_CHAR_ENCODING_8859_3 = 12 /* ISO-8859-3 */
    XML_CHAR_ENCODING_8859_4 = 13 /* ISO-8859-4 */
    XML_CHAR_ENCODING_8859_5 = 14 /* ISO-8859-5 */
    XML_CHAR_ENCODING_8859_6 = 15 /* ISO-8859-6 */
    XML_CHAR_ENCODING_8859_7 = 16 /* ISO-8859-7 */
    XML_CHAR_ENCODING_8859_8 = 17 /* ISO-8859-8 */
    XML_CHAR_ENCODING_8859_9 = 18 /* ISO-8859-9 */
    XML_CHAR_ENCODING_2022_JP = 19 /* ISO-2022-JP */
    XML_CHAR_ENCODING_SHIFT_JIS = 20 /* Shift_JIS */
    XML_CHAR_ENCODING_EUC_JP = 21 /* EUC-JP */
    XML_CHAR_ENCODING_ASCII = 22 /*  pure ASCII */
};


Structure xmlCharEncodingHandler

struct _xmlCharEncodingHandler {
    char *	name
    xmlCharEncodingInputFunc	input
    xmlCharEncodingOutputFunc	output
    iconv_t	iconv_in
    iconv_t	iconv_out
    struct _uconv_t *	uconv_in
    struct _uconv_t *	uconv_out
} xmlCharEncodingHandler;


Typedef xmlCharEncodingHandlerPtr

xmlCharEncodingHandler * xmlCharEncodingHandlerPtr;


Function type xmlCharEncodingInputFunc

int	xmlCharEncodingInputFunc	(unsigned char * out, 
int * outlen,
const unsigned char * in,
int * inlen)

Take a block of chars in the original encoding and try to convert it to an UTF-8 block of chars out.

out: a pointer to an array of bytes to store the UTF-8 result
outlen: the length of @out
in: a pointer to an array of chars in the original encoding
inlen: the length of @in
Returns: the number of bytes written, -1 if lack of space, or -2 if the transcoding failed. The value of @inlen after return is the number of octets consumed if the return value is positive, else unpredictiable. The value of @outlen after return is the number of octets consumed.

Function type xmlCharEncodingOutputFunc

int	xmlCharEncodingOutputFunc	(unsigned char * out, 
int * outlen,
const unsigned char * in,
int * inlen)

Take a block of UTF-8 chars in and try to convert it to another encoding. Note: a first call designed to produce heading info is called with in = NULL. If stateful this should also initialize the encoder state.

out: a pointer to an array of bytes to store the result
outlen: the length of @out
in: a pointer to an array of UTF-8 chars
inlen: the length of @in
Returns: the number of bytes written, -1 if lack of space, or -2 if the transcoding failed. The value of @inlen after return is the number of octets consumed if the return value is positive, else unpredictiable. The value of @outlen after return is the number of octets produced.

UTF8Toisolat1 ()

int	UTF8Toisolat1			(unsigned char * out, 
int * outlen,
const unsigned char * in,
int * inlen)

Take a block of UTF-8 chars in and try to convert it to an ISO Latin 1 block of chars out.

out: a pointer to an array of bytes to store the result
outlen: the length of @out
in: a pointer to an array of UTF-8 chars
inlen: the length of @in
Returns: the number of bytes written or an XML_ENC_ERR code. The value of @inlen after return is the number of octets consumed if the return value is positive, else unpredictable. The value of @outlen after return is the number of octets produced.

isolat1ToUTF8 ()

int	isolat1ToUTF8			(unsigned char * out, 
int * outlen,
const unsigned char * in,
int * inlen)

Take a block of ISO Latin 1 chars in and try to convert it to an UTF-8 block of chars out.

out: a pointer to an array of bytes to store the result
outlen: the length of @out
in: a pointer to an array of ISO Latin 1 chars
inlen: the length of @in
Returns: the number of bytes written or an XML_ENC_ERR code. The value of @inlen after return is the number of octets consumed if the return value is positive, else unpredictable. The value of @outlen after return is the number of octets produced.

xmlAddEncodingAlias ()

int	xmlAddEncodingAlias		(const char * name, 
const char * alias)

Registers an alias @alias for an encoding named @name. Existing alias will be overwritten.

name: the encoding name as parsed, in UTF-8 format (ASCII actually)
alias: the alias name as parsed, in UTF-8 format (ASCII actually)
Returns: 0 in case of success, -1 in case of error

xmlCharEncCloseFunc ()

int	xmlCharEncCloseFunc		(xmlCharEncodingHandler * handler)

Generic front-end for encoding handler close function

handler: char encoding transformation data structure
Returns: 0 if success, or -1 in case of error

xmlCharEncFirstLine ()

int	xmlCharEncFirstLine		(xmlCharEncodingHandler * handler, 
xmlBufferPtr out,
xmlBufferPtr in)

DEPERECATED: Don't use.

handler: char encoding transformation data structure
out: an xmlBuffer for the output.
in: an xmlBuffer for the input
Returns: the number of bytes written or an XML_ENC_ERR code.

xmlCharEncInFunc ()

int	xmlCharEncInFunc		(xmlCharEncodingHandler * handler, 
xmlBufferPtr out,
xmlBufferPtr in)

Generic front-end for the encoding handler input function

handler: char encoding transformation data structure
out: an xmlBuffer for the output.
in: an xmlBuffer for the input
Returns: the number of bytes written or an XML_ENC_ERR code.

xmlCharEncOutFunc ()

int	xmlCharEncOutFunc		(xmlCharEncodingHandler * handler, 
xmlBufferPtr out,
xmlBufferPtr in)

Generic front-end for the encoding handler output function a first call with @in == NULL has to be made firs to initiate the output in case of non-stateless encoding needing to initiate their state or the output (like the BOM in UTF16). In case of UTF8 sequence conversion errors for the given encoder, the content will be automatically remapped to a CharRef sequence.

handler: char encoding transformation data structure
out: an xmlBuffer for the output.
in: an xmlBuffer for the input
Returns: the number of bytes written or an XML_ENC_ERR code.

xmlCleanupCharEncodingHandlers ()

void	xmlCleanupCharEncodingHandlers	(void)

DEPRECATED: This function will be made private. Call xmlCleanupParser to free global state but see the warnings there. xmlCleanupParser should be only called once at program exit. In most cases, you don't have call cleanup functions at all. Cleanup the memory allocated for the char encoding support, it unregisters all the encoding handlers and the aliases.


xmlCleanupEncodingAliases ()

void	xmlCleanupEncodingAliases	(void)

Unregisters all aliases


xmlDelEncodingAlias ()

int	xmlDelEncodingAlias		(const char * alias)

Unregisters an encoding alias @alias

alias: the alias name as parsed, in UTF-8 format (ASCII actually)
Returns: 0 in case of success, -1 in case of error

xmlDetectCharEncoding ()

xmlCharEncoding	xmlDetectCharEncoding	(const unsigned char * in, 
int len)

Guess the encoding of the entity using the first bytes of the entity content according to the non-normative appendix F of the XML-1.0 recommendation.

in: a pointer to the first bytes of the XML entity, must be at least 2 bytes long (at least 4 if encoding is UTF4 variant).
len: pointer to the length of the buffer
Returns: one of the XML_CHAR_ENCODING_... values.

xmlFindCharEncodingHandler ()

xmlCharEncodingHandlerPtr	xmlFindCharEncodingHandler	(const char * name)

Search in the registered set the handler able to read/write that encoding or create a new one.

name: a string describing the char encoding.
Returns: the handler or NULL if not found

xmlGetCharEncodingHandler ()

xmlCharEncodingHandlerPtr	xmlGetCharEncodingHandler	(xmlCharEncoding enc)

Search in the registered set the handler able to read/write that encoding.

enc: an xmlCharEncoding value.
Returns: the handler or NULL if not found

xmlGetCharEncodingName ()

const char *	xmlGetCharEncodingName	(xmlCharEncoding enc)

The "canonical" name for XML encoding. C.f. http://www.w3.org/TR/REC-xml#charencoding Section 4.3.3 Character Encoding in Entities

enc: the encoding
Returns: the canonical name for the given encoding

xmlGetEncodingAlias ()

const char *	xmlGetEncodingAlias	(const char * alias)

Lookup an encoding name for the given alias.

alias: the alias name as parsed, in UTF-8 format (ASCII actually)
Returns: NULL if not found, otherwise the original name

xmlInitCharEncodingHandlers ()

void	xmlInitCharEncodingHandlers	(void)

DEPRECATED: Alias for xmlInitParser.


xmlNewCharEncodingHandler ()

xmlCharEncodingHandlerPtr	xmlNewCharEncodingHandler	(const char * name, 
xmlCharEncodingInputFunc input,
xmlCharEncodingOutputFunc output)

Create and registers an xmlCharEncodingHandler.

name: the encoding name, in UTF-8 format (ASCII actually)
input: the xmlCharEncodingInputFunc to read that encoding
output: the xmlCharEncodingOutputFunc to write that encoding
Returns: the xmlCharEncodingHandlerPtr created (or NULL in case of error).

xmlParseCharEncoding ()

xmlCharEncoding	xmlParseCharEncoding	(const char * name)

Compare the string to the encoding schemes already known. Note that the comparison is case insensitive accordingly to the section [XML] 4.3.3 Character Encoding in Entities.

name: the encoding name as parsed, in UTF-8 format (ASCII actually)
Returns: one of the XML_CHAR_ENCODING_... values or XML_CHAR_ENCODING_NONE if not recognized.

xmlRegisterCharEncodingHandler ()

void	xmlRegisterCharEncodingHandler	(xmlCharEncodingHandlerPtr handler)

Register the char encoding handler, surprising, isn't it ?

handler: the xmlCharEncodingHandlerPtr handler block