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98840d40da
To detect EBCDIC code pages, we used to switch the encoding twice and had to be very careful not to decode data after the XML declaration before the second switch. This relied on a hard-coded expected size of the XML declaration and was complicated and unreliable. Now we convert the first 200 bytes to EBCDIC-US and parse the encoding declaration manually.
234 lines
7.7 KiB
C
234 lines
7.7 KiB
C
/*
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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 __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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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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struct _uconv_t *uconv_in;
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struct _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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XML_DEPRECATED
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XMLPUBFUN void
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xmlInitCharEncodingHandlers (void);
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XML_DEPRECATED
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XMLPUBFUN void
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xmlCleanupCharEncodingHandlers (void);
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XMLPUBFUN void
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xmlRegisterCharEncodingHandler (xmlCharEncodingHandlerPtr handler);
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XMLPUBFUN xmlCharEncodingHandlerPtr
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xmlGetCharEncodingHandler (xmlCharEncoding enc);
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XMLPUBFUN xmlCharEncodingHandlerPtr
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xmlFindCharEncodingHandler (const char *name);
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XMLPUBFUN xmlCharEncodingHandlerPtr
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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
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xmlAddEncodingAlias (const char *name,
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const char *alias);
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XMLPUBFUN int
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xmlDelEncodingAlias (const char *alias);
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XMLPUBFUN const char *
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xmlGetEncodingAlias (const char *alias);
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XMLPUBFUN void
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xmlCleanupEncodingAliases (void);
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XMLPUBFUN xmlCharEncoding
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xmlParseCharEncoding (const char *name);
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XMLPUBFUN const char *
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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
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xmlDetectCharEncoding (const unsigned char *in,
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int len);
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XMLPUBFUN int
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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
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xmlCharEncInFunc (xmlCharEncodingHandler *handler,
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xmlBufferPtr out,
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xmlBufferPtr in);
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XML_DEPRECATED
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XMLPUBFUN int
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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
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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
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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
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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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