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encoding.h
/* * Summary: interface for the encoding conversion functions * Description: 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. * * Copy: See Copyright for the status of this software. * * Author: Daniel Veillard */ #ifndef __XML_CHAR_ENCODING_H__ #define __XML_CHAR_ENCODING_H__ #include <libxml/xmlversion.h> #ifdef LIBXML_ICONV_ENABLED #include <iconv.h> #endif #ifdef LIBXML_ICU_ENABLED #include <unicode/ucnv.h> #endif #ifdef __cplusplus extern "C" { #endif /* * xmlCharEncoding: * * Predefined values for some standard encodings. * Libxml does not do beforehand translation on UTF8 and ISOLatinX. * It also supports ASCII, ISO-8859-1, and UTF16 (LE and BE) by default. * * Anything else would have to be translated to UTF8 before being * given to the parser itself. The BOM for UTF16 and the encoding * declaration are looked at and a converter is looked for at that * point. If not found the parser stops here as asked by the XML REC. A * converter can be registered by the user using xmlRegisterCharEncodingHandler * but the current form doesn't allow stateful transcoding (a serious * problem agreed !). If iconv has been found it will be used * automatically and allow stateful transcoding, the simplest is then * to be sure to enable iconv and to provide iconv libs for the encoding * support needed. * * Note that the generic "UTF-16" is not a predefined value. Instead, only * the specific UTF-16LE and UTF-16BE are present. */ typedef enum { 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 */ } xmlCharEncoding; /** * xmlCharEncodingInputFunc: * @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 * * Take a block of chars in the original encoding and try to convert * it to an UTF-8 block of chars out. * * 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. */ typedef int (* xmlCharEncodingInputFunc)(unsigned char *out, int *outlen, const unsigned char *in, int *inlen); /** * xmlCharEncodingOutputFunc: * @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 * * 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. * * 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. */ typedef int (* xmlCharEncodingOutputFunc)(unsigned char *out, int *outlen, const unsigned char *in, int *inlen); /* * Block defining the handlers for non UTF-8 encodings. * If iconv is supported, there are two extra fields. */ #ifdef LIBXML_ICU_ENABLED /* Size of pivot buffer, same as icu/source/common/ucnv.cpp CHUNK_SIZE */ #define ICU_PIVOT_BUF_SIZE 1024 struct _uconv_t { UConverter *uconv; /* for conversion between an encoding and UTF-16 */ UConverter *utf8; /* for conversion between UTF-8 and UTF-16 */ UChar pivot_buf[ICU_PIVOT_BUF_SIZE]; UChar *pivot_source; UChar *pivot_target; }; typedef struct _uconv_t uconv_t; #endif typedef struct _xmlCharEncodingHandler xmlCharEncodingHandler; typedef xmlCharEncodingHandler *xmlCharEncodingHandlerPtr; struct _xmlCharEncodingHandler { char *name; xmlCharEncodingInputFunc input; xmlCharEncodingOutputFunc output; #ifdef LIBXML_ICONV_ENABLED iconv_t iconv_in; iconv_t iconv_out; #endif /* LIBXML_ICONV_ENABLED */ #ifdef LIBXML_ICU_ENABLED uconv_t *uconv_in; uconv_t *uconv_out; #endif /* LIBXML_ICU_ENABLED */ }; #ifdef __cplusplus } #endif #include <libxml/tree.h> #ifdef __cplusplus extern "C" { #endif /* * Interfaces for encoding handlers. */ XMLPUBFUN void XMLCALL xmlInitCharEncodingHandlers (void); XMLPUBFUN void XMLCALL xmlCleanupCharEncodingHandlers (void); XMLPUBFUN void XMLCALL xmlRegisterCharEncodingHandler (xmlCharEncodingHandlerPtr handler); XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL xmlGetCharEncodingHandler (xmlCharEncoding enc); XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL xmlFindCharEncodingHandler (const char *name); XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL xmlNewCharEncodingHandler (const char *name, xmlCharEncodingInputFunc input, xmlCharEncodingOutputFunc output); /* * Interfaces for encoding names and aliases. */ XMLPUBFUN int XMLCALL xmlAddEncodingAlias (const char *name, const char *alias); XMLPUBFUN int XMLCALL xmlDelEncodingAlias (const char *alias); XMLPUBFUN const char * XMLCALL xmlGetEncodingAlias (const char *alias); XMLPUBFUN void XMLCALL xmlCleanupEncodingAliases (void); XMLPUBFUN xmlCharEncoding XMLCALL xmlParseCharEncoding (const char *name); XMLPUBFUN const char * XMLCALL xmlGetCharEncodingName (xmlCharEncoding enc); /* * Interfaces directly used by the parsers. */ XMLPUBFUN xmlCharEncoding XMLCALL xmlDetectCharEncoding (const unsigned char *in, int len); XMLPUBFUN int XMLCALL xmlCharEncOutFunc (xmlCharEncodingHandler *handler, xmlBufferPtr out, xmlBufferPtr in); XMLPUBFUN int XMLCALL xmlCharEncInFunc (xmlCharEncodingHandler *handler, xmlBufferPtr out, xmlBufferPtr in); XMLPUBFUN int XMLCALL xmlCharEncFirstLine (xmlCharEncodingHandler *handler, xmlBufferPtr out, xmlBufferPtr in); XMLPUBFUN int XMLCALL xmlCharEncCloseFunc (xmlCharEncodingHandler *handler); /* * Export a few useful functions */ #ifdef LIBXML_OUTPUT_ENABLED XMLPUBFUN int XMLCALL UTF8Toisolat1 (unsigned char *out, int *outlen, const unsigned char *in, int *inlen); #endif /* LIBXML_OUTPUT_ENABLED */ XMLPUBFUN int XMLCALL isolat1ToUTF8 (unsigned char *out, int *outlen, const unsigned char *in, int *inlen); #ifdef __cplusplus } #endif #endif /* __XML_CHAR_ENCODING_H__ */
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