include/reactos/libs/libxml/encoding.h

   1 /*
   2  * Summary: interface for the encoding conversion functions
   3  * Description: interface for the encoding conversion functions needed for
   4  *              XML basic encoding and iconv() support.
   5  *
   6  * Related specs are
   7  * rfc2044        (UTF-8 and UTF-16) F. Yergeau Alis Technologies
   8  * [ISO-10646]    UTF-8 and UTF-16 in Annexes
   9  * [ISO-8859-1]   ISO Latin-1 characters codes.
  10  * [UNICODE]      The Unicode Consortium, "The Unicode Standard --
  11  *                Worldwide Character Encoding -- Version 1.0", Addison-
  12  *                Wesley, Volume 1, 1991, Volume 2, 1992.  UTF-8 is
  13  *                described in Unicode Technical Report #4.
  14  * [US-ASCII]     Coded Character Set--7-bit American Standard Code for
  15  *                Information Interchange, ANSI X3.4-1986.
  16  *
  17  * Copy: See Copyright for the status of this software.
  18  *
  19  * Author: Daniel Veillard
  20  */
  21
  22 #ifndef __XML_CHAR_ENCODING_H__
  23 #define __XML_CHAR_ENCODING_H__
  24
  25 #include <libxml/xmlversion.h>
  26
  27 #ifdef LIBXML_ICONV_ENABLED
  28 #include <iconv.h>
  29 #endif
  30 #ifdef LIBXML_ICU_ENABLED
  31 #include <unicode/ucnv.h>
  32 #endif
  33 #ifdef __cplusplus
  34 extern "C" {
  35 #endif
  36
  37 /*
  38  * xmlCharEncoding:
  39  *
  40  * Predefined values for some standard encodings.
  41  * Libxml does not do beforehand translation on UTF8 and ISOLatinX.
  42  * It also supports ASCII, ISO-8859-1, and UTF16 (LE and BE) by default.
  43  *
  44  * Anything else would have to be translated to UTF8 before being
  45  * given to the parser itself. The BOM for UTF16 and the encoding
  46  * declaration are looked at and a converter is looked for at that
  47  * point. If not found the parser stops here as asked by the XML REC. A
  48  * converter can be registered by the user using xmlRegisterCharEncodingHandler
  49  * but the current form doesn't allow stateful transcoding (a serious
  50  * problem agreed !). If iconv has been found it will be used
  51  * automatically and allow stateful transcoding, the simplest is then
  52  * to be sure to enable iconv and to provide iconv libs for the encoding
  53  * support needed.
  54  *
  55  * Note that the generic "UTF-16" is not a predefined value.  Instead, only
  56  * the specific UTF-16LE and UTF-16BE are present.
  57  */
  58 typedef enum {
  59     XML_CHAR_ENCODING_ERROR=   -1, /* No char encoding detected */
  60     XML_CHAR_ENCODING_NONE=     0, /* No char encoding detected */
  61     XML_CHAR_ENCODING_UTF8=     1, /* UTF-8 */
  62     XML_CHAR_ENCODING_UTF16LE=  2, /* UTF-16 little endian */
  63     XML_CHAR_ENCODING_UTF16BE=  3, /* UTF-16 big endian */
  64     XML_CHAR_ENCODING_UCS4LE=   4, /* UCS-4 little endian */
  65     XML_CHAR_ENCODING_UCS4BE=   5, /* UCS-4 big endian */
  66     XML_CHAR_ENCODING_EBCDIC=   6, /* EBCDIC uh! */
  67     XML_CHAR_ENCODING_UCS4_2143=7, /* UCS-4 unusual ordering */
  68     XML_CHAR_ENCODING_UCS4_3412=8, /* UCS-4 unusual ordering */
  69     XML_CHAR_ENCODING_UCS2=     9, /* UCS-2 */
  70     XML_CHAR_ENCODING_8859_1=   10,/* ISO-8859-1 ISO Latin 1 */
  71     XML_CHAR_ENCODING_8859_2=   11,/* ISO-8859-2 ISO Latin 2 */
  72     XML_CHAR_ENCODING_8859_3=   12,/* ISO-8859-3 */
  73     XML_CHAR_ENCODING_8859_4=   13,/* ISO-8859-4 */
  74     XML_CHAR_ENCODING_8859_5=   14,/* ISO-8859-5 */
  75     XML_CHAR_ENCODING_8859_6=   15,/* ISO-8859-6 */
  76     XML_CHAR_ENCODING_8859_7=   16,/* ISO-8859-7 */
  77     XML_CHAR_ENCODING_8859_8=   17,/* ISO-8859-8 */
  78     XML_CHAR_ENCODING_8859_9=   18,/* ISO-8859-9 */
  79     XML_CHAR_ENCODING_2022_JP=  19,/* ISO-2022-JP */
  80     XML_CHAR_ENCODING_SHIFT_JIS=20,/* Shift_JIS */
  81     XML_CHAR_ENCODING_EUC_JP=   21,/* EUC-JP */
  82     XML_CHAR_ENCODING_ASCII=    22 /* pure ASCII */
  83 } xmlCharEncoding;
  84
  85 /**
  86  * xmlCharEncodingInputFunc:
  87  * @out:  a pointer to an array of bytes to store the UTF-8 result
  88  * @outlen:  the length of @out
  89  * @in:  a pointer to an array of chars in the original encoding
  90  * @inlen:  the length of @in
  91  *
  92  * Take a block of chars in the original encoding and try to convert
  93  * it to an UTF-8 block of chars out.
  94  *
  95  * Returns the number of bytes written, -1 if lack of space, or -2
  96  *     if the transcoding failed.
  97  * The value of @inlen after return is the number of octets consumed
  98  *     if the return value is positive, else unpredictiable.
  99  * The value of @outlen after return is the number of octets consumed.
 100  */
 101 typedef int (* xmlCharEncodingInputFunc)(unsigned char *out, int *outlen,
 102                                          const unsigned char *in, int *inlen);
 103
 104
 105 /**
 106  * xmlCharEncodingOutputFunc:
 107  * @out:  a pointer to an array of bytes to store the result
 108  * @outlen:  the length of @out
 109  * @in:  a pointer to an array of UTF-8 chars
 110  * @inlen:  the length of @in
 111  *
 112  * Take a block of UTF-8 chars in and try to convert it to another
 113  * encoding.
 114  * Note: a first call designed to produce heading info is called with
 115  * in = NULL. If stateful this should also initialize the encoder state.
 116  *
 117  * Returns the number of bytes written, -1 if lack of space, or -2
 118  *     if the transcoding failed.
 119  * The value of @inlen after return is the number of octets consumed
 120  *     if the return value is positive, else unpredictiable.
 121  * The value of @outlen after return is the number of octets produced.
 122  */
 123 typedef int (* xmlCharEncodingOutputFunc)(unsigned char *out, int *outlen,
 124                                           const unsigned char *in, int *inlen);
 125
 126
 127 /*
 128  * Block defining the handlers for non UTF-8 encodings.
 129  * If iconv is supported, there are two extra fields.
 130  */
 131 #ifdef LIBXML_ICU_ENABLED
 132 struct _uconv_t {
 133   UConverter *uconv; /* for conversion between an encoding and UTF-16 */
 134   UConverter *utf8; /* for conversion between UTF-8 and UTF-16 */
 135 };
 136 typedef struct _uconv_t uconv_t;
 137 #endif
 138
 139 typedef struct _xmlCharEncodingHandler xmlCharEncodingHandler;
 140 typedef xmlCharEncodingHandler *xmlCharEncodingHandlerPtr;
 141 struct _xmlCharEncodingHandler {
 142     char                       *name;
 143     xmlCharEncodingInputFunc   input;
 144     xmlCharEncodingOutputFunc  output;
 145 #ifdef LIBXML_ICONV_ENABLED
 146     iconv_t                    iconv_in;
 147     iconv_t                    iconv_out;
 148 #endif /* LIBXML_ICONV_ENABLED */
 149 #ifdef LIBXML_ICU_ENABLED
 150     uconv_t                    *uconv_in;
 151     uconv_t                    *uconv_out;
 152 #endif /* LIBXML_ICU_ENABLED */
 153 };
 154
 155 #ifdef __cplusplus
 156 }
 157 #endif
 158 #include <libxml/tree.h>
 159 #ifdef __cplusplus
 160 extern "C" {
 161 #endif
 162
 163 /*
 164  * Interfaces for encoding handlers.
 165  */
 166 XMLPUBFUN void XMLCALL
 167         xmlInitCharEncodingHandlers     (void);
 168 XMLPUBFUN void XMLCALL
 169         xmlCleanupCharEncodingHandlers  (void);
 170 XMLPUBFUN void XMLCALL
 171         xmlRegisterCharEncodingHandler  (xmlCharEncodingHandlerPtr handler);
 172 XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL
 173         xmlGetCharEncodingHandler       (xmlCharEncoding enc);
 174 XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL
 175         xmlFindCharEncodingHandler      (const char *name);
 176 XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL
 177         xmlNewCharEncodingHandler       (const char *name,
 178                                          xmlCharEncodingInputFunc input,
 179                                          xmlCharEncodingOutputFunc output);
 180
 181 /*
 182  * Interfaces for encoding names and aliases.
 183  */
 184 XMLPUBFUN int XMLCALL
 185         xmlAddEncodingAlias             (const char *name,
 186                                          const char *alias);
 187 XMLPUBFUN int XMLCALL
 188         xmlDelEncodingAlias             (const char *alias);
 189 XMLPUBFUN const char * XMLCALL
 190         xmlGetEncodingAlias             (const char *alias);
 191 XMLPUBFUN void XMLCALL
 192         xmlCleanupEncodingAliases       (void);
 193 XMLPUBFUN xmlCharEncoding XMLCALL
 194         xmlParseCharEncoding            (const char *name);
 195 XMLPUBFUN const char * XMLCALL
 196         xmlGetCharEncodingName          (xmlCharEncoding enc);
 197
 198 /*
 199  * Interfaces directly used by the parsers.
 200  */
 201 XMLPUBFUN xmlCharEncoding XMLCALL
 202         xmlDetectCharEncoding           (const unsigned char *in,
 203                                          int len);
 204
 205 XMLPUBFUN int XMLCALL
 206         xmlCharEncOutFunc               (xmlCharEncodingHandler *handler,
 207                                          xmlBufferPtr out,
 208                                          xmlBufferPtr in);
 209
 210 XMLPUBFUN int XMLCALL
 211         xmlCharEncInFunc                (xmlCharEncodingHandler *handler,
 212                                          xmlBufferPtr out,
 213                                          xmlBufferPtr in);
 214 XMLPUBFUN int XMLCALL
 215         xmlCharEncFirstLine             (xmlCharEncodingHandler *handler,
 216                                          xmlBufferPtr out,
 217                                          xmlBufferPtr in);
 218 XMLPUBFUN int XMLCALL
 219         xmlCharEncCloseFunc             (xmlCharEncodingHandler *handler);
 220
 221 /*
 222  * Export a few useful functions
 223  */
 224 #ifdef LIBXML_OUTPUT_ENABLED
 225 XMLPUBFUN int XMLCALL
 226         UTF8Toisolat1                   (unsigned char *out,
 227                                          int *outlen,
 228                                          const unsigned char *in,
 229                                          int *inlen);
 230 #endif /* LIBXML_OUTPUT_ENABLED */
 231 XMLPUBFUN int XMLCALL
 232         isolat1ToUTF8                   (unsigned char *out,
 233                                          int *outlen,
 234                                          const unsigned char *in,
 235                                          int *inlen);
 236 #ifdef __cplusplus
 237 }
 238 #endif
 239
 240 #endif /* __XML_CHAR_ENCODING_H__ */