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246 lines
8.3 KiB
C
246 lines
8.3 KiB
C
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/*
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* Summary: interface for the encoding conversion functions
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* Description: interface for the encoding conversion functions needed for
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* XML basic encoding and iconv() support.
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*
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* Related specs are
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* rfc2044 (UTF-8 and UTF-16) F. Yergeau Alis Technologies
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* [ISO-10646] UTF-8 and UTF-16 in Annexes
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* [ISO-8859-1] ISO Latin-1 characters codes.
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* [UNICODE] The Unicode Consortium, "The Unicode Standard --
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* Worldwide Character Encoding -- Version 1.0", Addison-
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* Wesley, Volume 1, 1991, Volume 2, 1992. UTF-8 is
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* described in Unicode Technical Report #4.
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* [US-ASCII] Coded Character Set--7-bit American Standard Code for
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* Information Interchange, ANSI X3.4-1986.
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*
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* Copy: See Copyright for the status of this software.
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*
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* Author: Daniel Veillard
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*/
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#ifndef __XML_CHAR_ENCODING_H__
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#define __XML_CHAR_ENCODING_H__
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#include <libxml/xmlversion.h>
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#ifdef LIBXML_ICONV_ENABLED
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#include <iconv.h>
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#endif
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#ifdef LIBXML_ICU_ENABLED
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#include <unicode/ucnv.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* xmlCharEncoding:
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*
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* Predefined values for some standard encodings.
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* Libxml does not do beforehand translation on UTF8 and ISOLatinX.
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* It also supports ASCII, ISO-8859-1, and UTF16 (LE and BE) by default.
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*
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* Anything else would have to be translated to UTF8 before being
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* given to the parser itself. The BOM for UTF16 and the encoding
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* declaration are looked at and a converter is looked for at that
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* point. If not found the parser stops here as asked by the XML REC. A
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* converter can be registered by the user using xmlRegisterCharEncodingHandler
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* but the current form doesn't allow stateful transcoding (a serious
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* problem agreed !). If iconv has been found it will be used
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* automatically and allow stateful transcoding, the simplest is then
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* to be sure to enable iconv and to provide iconv libs for the encoding
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* support needed.
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*
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* Note that the generic "UTF-16" is not a predefined value. Instead, only
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* the specific UTF-16LE and UTF-16BE are present.
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*/
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typedef enum {
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XML_CHAR_ENCODING_ERROR= -1, /* No char encoding detected */
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XML_CHAR_ENCODING_NONE= 0, /* No char encoding detected */
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XML_CHAR_ENCODING_UTF8= 1, /* UTF-8 */
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XML_CHAR_ENCODING_UTF16LE= 2, /* UTF-16 little endian */
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XML_CHAR_ENCODING_UTF16BE= 3, /* UTF-16 big endian */
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XML_CHAR_ENCODING_UCS4LE= 4, /* UCS-4 little endian */
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XML_CHAR_ENCODING_UCS4BE= 5, /* UCS-4 big endian */
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XML_CHAR_ENCODING_EBCDIC= 6, /* EBCDIC uh! */
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XML_CHAR_ENCODING_UCS4_2143=7, /* UCS-4 unusual ordering */
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XML_CHAR_ENCODING_UCS4_3412=8, /* UCS-4 unusual ordering */
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XML_CHAR_ENCODING_UCS2= 9, /* UCS-2 */
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XML_CHAR_ENCODING_8859_1= 10,/* ISO-8859-1 ISO Latin 1 */
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XML_CHAR_ENCODING_8859_2= 11,/* ISO-8859-2 ISO Latin 2 */
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XML_CHAR_ENCODING_8859_3= 12,/* ISO-8859-3 */
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XML_CHAR_ENCODING_8859_4= 13,/* ISO-8859-4 */
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XML_CHAR_ENCODING_8859_5= 14,/* ISO-8859-5 */
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XML_CHAR_ENCODING_8859_6= 15,/* ISO-8859-6 */
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XML_CHAR_ENCODING_8859_7= 16,/* ISO-8859-7 */
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XML_CHAR_ENCODING_8859_8= 17,/* ISO-8859-8 */
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XML_CHAR_ENCODING_8859_9= 18,/* ISO-8859-9 */
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XML_CHAR_ENCODING_2022_JP= 19,/* ISO-2022-JP */
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XML_CHAR_ENCODING_SHIFT_JIS=20,/* Shift_JIS */
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XML_CHAR_ENCODING_EUC_JP= 21,/* EUC-JP */
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XML_CHAR_ENCODING_ASCII= 22 /* pure ASCII */
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} xmlCharEncoding;
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/**
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* xmlCharEncodingInputFunc:
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* @out: a pointer to an array of bytes to store the UTF-8 result
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* @outlen: the length of @out
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* @in: a pointer to an array of chars in the original encoding
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* @inlen: the length of @in
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*
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* Take a block of chars in the original encoding and try to convert
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* it to an UTF-8 block of chars out.
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*
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* Returns the number of bytes written, -1 if lack of space, or -2
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* if the transcoding failed.
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* The value of @inlen after return is the number of octets consumed
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* if the return value is positive, else unpredictiable.
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* The value of @outlen after return is the number of octets consumed.
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*/
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typedef int (* xmlCharEncodingInputFunc)(unsigned char *out, int *outlen,
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const unsigned char *in, int *inlen);
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/**
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* xmlCharEncodingOutputFunc:
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* @out: a pointer to an array of bytes to store the result
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* @outlen: the length of @out
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* @in: a pointer to an array of UTF-8 chars
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* @inlen: the length of @in
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*
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* Take a block of UTF-8 chars in and try to convert it to another
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* encoding.
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* Note: a first call designed to produce heading info is called with
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* in = NULL. If stateful this should also initialize the encoder state.
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*
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* Returns the number of bytes written, -1 if lack of space, or -2
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* if the transcoding failed.
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* The value of @inlen after return is the number of octets consumed
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* if the return value is positive, else unpredictiable.
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* The value of @outlen after return is the number of octets produced.
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*/
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typedef int (* xmlCharEncodingOutputFunc)(unsigned char *out, int *outlen,
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const unsigned char *in, int *inlen);
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/*
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* Block defining the handlers for non UTF-8 encodings.
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* If iconv is supported, there are two extra fields.
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*/
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#ifdef LIBXML_ICU_ENABLED
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/* Size of pivot buffer, same as icu/source/common/ucnv.cpp CHUNK_SIZE */
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#define ICU_PIVOT_BUF_SIZE 1024
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struct _uconv_t {
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UConverter *uconv; /* for conversion between an encoding and UTF-16 */
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UConverter *utf8; /* for conversion between UTF-8 and UTF-16 */
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UChar pivot_buf[ICU_PIVOT_BUF_SIZE];
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UChar *pivot_source;
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UChar *pivot_target;
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};
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typedef struct _uconv_t uconv_t;
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#endif
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typedef struct _xmlCharEncodingHandler xmlCharEncodingHandler;
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typedef xmlCharEncodingHandler *xmlCharEncodingHandlerPtr;
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struct _xmlCharEncodingHandler {
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char *name;
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xmlCharEncodingInputFunc input;
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xmlCharEncodingOutputFunc output;
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#ifdef LIBXML_ICONV_ENABLED
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iconv_t iconv_in;
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iconv_t iconv_out;
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#endif /* LIBXML_ICONV_ENABLED */
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#ifdef LIBXML_ICU_ENABLED
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uconv_t *uconv_in;
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uconv_t *uconv_out;
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#endif /* LIBXML_ICU_ENABLED */
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};
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#ifdef __cplusplus
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}
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#endif
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#include <libxml/tree.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Interfaces for encoding handlers.
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*/
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XMLPUBFUN void XMLCALL
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xmlInitCharEncodingHandlers (void);
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XMLPUBFUN void XMLCALL
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xmlCleanupCharEncodingHandlers (void);
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XMLPUBFUN void XMLCALL
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xmlRegisterCharEncodingHandler (xmlCharEncodingHandlerPtr handler);
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XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL
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xmlGetCharEncodingHandler (xmlCharEncoding enc);
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XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL
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xmlFindCharEncodingHandler (const char *name);
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XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL
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xmlNewCharEncodingHandler (const char *name,
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xmlCharEncodingInputFunc input,
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xmlCharEncodingOutputFunc output);
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/*
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* Interfaces for encoding names and aliases.
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*/
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XMLPUBFUN int XMLCALL
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xmlAddEncodingAlias (const char *name,
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const char *alias);
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XMLPUBFUN int XMLCALL
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xmlDelEncodingAlias (const char *alias);
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XMLPUBFUN const char * XMLCALL
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xmlGetEncodingAlias (const char *alias);
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XMLPUBFUN void XMLCALL
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xmlCleanupEncodingAliases (void);
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XMLPUBFUN xmlCharEncoding XMLCALL
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xmlParseCharEncoding (const char *name);
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XMLPUBFUN const char * XMLCALL
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xmlGetCharEncodingName (xmlCharEncoding enc);
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/*
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* Interfaces directly used by the parsers.
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*/
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XMLPUBFUN xmlCharEncoding XMLCALL
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xmlDetectCharEncoding (const unsigned char *in,
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int len);
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XMLPUBFUN int XMLCALL
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xmlCharEncOutFunc (xmlCharEncodingHandler *handler,
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xmlBufferPtr out,
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xmlBufferPtr in);
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XMLPUBFUN int XMLCALL
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xmlCharEncInFunc (xmlCharEncodingHandler *handler,
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xmlBufferPtr out,
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xmlBufferPtr in);
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XMLPUBFUN int XMLCALL
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xmlCharEncFirstLine (xmlCharEncodingHandler *handler,
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xmlBufferPtr out,
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xmlBufferPtr in);
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XMLPUBFUN int XMLCALL
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xmlCharEncCloseFunc (xmlCharEncodingHandler *handler);
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/*
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* Export a few useful functions
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*/
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#ifdef LIBXML_OUTPUT_ENABLED
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XMLPUBFUN int XMLCALL
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UTF8Toisolat1 (unsigned char *out,
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int *outlen,
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const unsigned char *in,
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int *inlen);
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#endif /* LIBXML_OUTPUT_ENABLED */
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XMLPUBFUN int XMLCALL
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isolat1ToUTF8 (unsigned char *out,
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int *outlen,
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const unsigned char *in,
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int *inlen);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __XML_CHAR_ENCODING_H__ */
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