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encoding.c
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encoding.c
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/*
* encoding.c : implements the encoding conversion functions needed for XML
*
* Related specs:
* rfc2044 (UTF-8 and UTF-16) F. Yergeau Alis Technologies
* rfc2781 UTF-16, an encoding of ISO 10646, P. Hoffman, F. Yergeau
* [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.
*
* See Copyright for the status of this software.
*
*
* Original code for IsoLatin1 and UTF-16 by "Martin J. Duerst" <[email protected]>
*/
#define IN_LIBXML
#include "libxml.h"
#include <string.h>
#include <limits.h>
#include <ctype.h>
#include <stdlib.h>
#ifdef LIBXML_ICONV_ENABLED
#include <iconv.h>
#include <errno.h>
#endif
#include <libxml/encoding.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#ifdef LIBXML_HTML_ENABLED
#include <libxml/HTMLparser.h>
#endif
#include <libxml/xmlerror.h>
#include "private/buf.h"
#include "private/enc.h"
#include "private/entities.h"
#include "private/error.h"
#ifdef LIBXML_ICU_ENABLED
#include <unicode/ucnv.h>
#endif
#define XML_HANDLER_STATIC 1
typedef struct _xmlCharEncodingAlias xmlCharEncodingAlias;
typedef xmlCharEncodingAlias *xmlCharEncodingAliasPtr;
struct _xmlCharEncodingAlias {
const char *name;
const char *alias;
};
static xmlCharEncodingAliasPtr xmlCharEncodingAliases = NULL;
static int xmlCharEncodingAliasesNb = 0;
static int xmlCharEncodingAliasesMax = 0;
static int xmlLittleEndian = 1;
typedef struct {
const char *name;
xmlCharEncoding enc;
} xmlEncTableEntry;
static const xmlEncTableEntry xmlEncTable[] = {
{ "ASCII", XML_CHAR_ENCODING_ASCII },
{ "EUC-JP", XML_CHAR_ENCODING_EUC_JP },
{ "HTML", XML_CHAR_ENCODING_HTML },
{ "ISO LATIN 1", XML_CHAR_ENCODING_8859_1 },
{ "ISO LATIN 2", XML_CHAR_ENCODING_8859_2 },
{ "ISO-10646-UCS-2", XML_CHAR_ENCODING_UCS2 },
{ "ISO-10646-UCS-4", XML_CHAR_ENCODING_UCS4LE },
{ "ISO-2022-JP", XML_CHAR_ENCODING_2022_JP },
{ "ISO-8859-1", XML_CHAR_ENCODING_8859_1 },
{ "ISO-8859-10", XML_CHAR_ENCODING_8859_10 },
{ "ISO-8859-11", XML_CHAR_ENCODING_8859_11 },
{ "ISO-8859-13", XML_CHAR_ENCODING_8859_13 },
{ "ISO-8859-14", XML_CHAR_ENCODING_8859_14 },
{ "ISO-8859-15", XML_CHAR_ENCODING_8859_15 },
{ "ISO-8859-16", XML_CHAR_ENCODING_8859_16 },
{ "ISO-8859-2", XML_CHAR_ENCODING_8859_2 },
{ "ISO-8859-3", XML_CHAR_ENCODING_8859_3 },
{ "ISO-8859-4", XML_CHAR_ENCODING_8859_4 },
{ "ISO-8859-5", XML_CHAR_ENCODING_8859_5 },
{ "ISO-8859-6", XML_CHAR_ENCODING_8859_6 },
{ "ISO-8859-7", XML_CHAR_ENCODING_8859_7 },
{ "ISO-8859-8", XML_CHAR_ENCODING_8859_8 },
{ "ISO-8859-9", XML_CHAR_ENCODING_8859_9 },
{ "ISO-LATIN-1", XML_CHAR_ENCODING_8859_1 },
{ "ISO-LATIN-2", XML_CHAR_ENCODING_8859_2 },
{ "SHIFT_JIS", XML_CHAR_ENCODING_SHIFT_JIS },
{ "UCS-2", XML_CHAR_ENCODING_UCS2 },
{ "UCS-4", XML_CHAR_ENCODING_UCS4LE },
{ "UCS2", XML_CHAR_ENCODING_UCS2 },
{ "UCS4", XML_CHAR_ENCODING_UCS4LE },
{ "US-ASCII", XML_CHAR_ENCODING_ASCII },
{ "UTF-16", XML_CHAR_ENCODING_UTF16 },
{ "UTF-16BE", XML_CHAR_ENCODING_UTF16BE },
{ "UTF-16LE", XML_CHAR_ENCODING_UTF16LE },
{ "UTF-8", XML_CHAR_ENCODING_UTF8 },
{ "UTF16", XML_CHAR_ENCODING_UTF16 },
{ "UTF8", XML_CHAR_ENCODING_UTF8 }
};
static int
asciiToAscii(unsigned char* out, int *outlen,
const unsigned char* in, int *inlen, void *vctxt);
static int
UTF8ToUTF8(unsigned char* out, int *outlen,
const unsigned char* inb, int *inlenb, void *vctxt);
static int
latin1ToUTF8(unsigned char* out, int *outlen,
const unsigned char* in, int *inlen, void *vctxt);
static int
UTF16LEToUTF8(unsigned char* out, int *outlen,
const unsigned char* inb, int *inlenb, void *vctxt);
static int
UTF16BEToUTF8(unsigned char* out, int *outlen,
const unsigned char* inb, int *inlenb, void *vctxt);
#ifdef LIBXML_OUTPUT_ENABLED
static int
UTF8ToLatin1(unsigned char* outb, int *outlen,
const unsigned char* in, int *inlen, void *vctxt);
static int
UTF8ToUTF16(unsigned char* outb, int *outlen,
const unsigned char* in, int *inlen, void *vctxt);
static int
UTF8ToUTF16LE(unsigned char* outb, int *outlen,
const unsigned char* in, int *inlen, void *vctxt);
static int
UTF8ToUTF16BE(unsigned char* outb, int *outlen,
const unsigned char* in, int *inlen, void *vctxt);
#else /* LIBXML_OUTPUT_ENABLED */
#define UTF8ToLatin1 NULL
#define UTF8ToUTF16 NULL
#define UTF8ToUTF16LE NULL
#define UTF8ToUTF16BE NULL
#endif /* LIBXML_OUTPUT_ENABLED */
#if defined(LIBXML_OUTPUT_ENABLED) && defined(LIBXML_HTML_ENABLED)
static int
UTF8ToHtmlWrapper(unsigned char *out, int *outlen,
const unsigned char *in, int *inlen, void *vctxt);
#else
#define UTF8ToHtmlWrapper NULL
#endif
#ifdef LIBXML_ICONV_ENABLED
#define EMPTY_ICONV , (iconv_t) 0, (iconv_t) 0
#else
#define EMPTY_ICONV
#endif
#if !defined(LIBXML_ICONV_ENABLED) && !defined(LIBXML_ICU_ENABLED) && \
defined(LIBXML_ISO8859X_ENABLED)
#include "iso8859x.inc"
static int
ISO8859xToUTF8(unsigned char* out, int *outlen,
const unsigned char* in, int *inlen, void *vctxt);
static int
UTF8ToISO8859x(unsigned char *out, int *outlen,
const unsigned char *in, int *inlen, void *vctxt);
#define MAKE_ISO_HANDLER(name, n) \
{ (char *) name, \
(xmlCharEncodingInputFunc) (void (*)(void)) ISO8859xToUTF8, \
(xmlCharEncodingInputFunc) (void (*)(void)) UTF8ToISO8859x \
EMPTY_ICONV, \
(void *) xmlunicodetable_ISO8859_##n, \
(void *) xmltranscodetable_ISO8859_##n, \
NULL, XML_HANDLER_STATIC }
#else /* LIBXML_ISO8859X_ENABLED */
#define MAKE_ISO_HANDLER(name, n) \
{ (char *) name, NULL, NULL EMPTY_ICONV, NULL, NULL, NULL, \
XML_HANDLER_STATIC }
#endif /* LIBXML_ISO8859X_ENABLED */
#define MAKE_HANDLER(name, in, out) \
{ (char *) name, \
(xmlCharEncodingInputFunc) (void (*)(void)) in, \
(xmlCharEncodingOutputFunc) (void (*)(void)) out \
EMPTY_ICONV, NULL, NULL, NULL, XML_HANDLER_STATIC }
/*
* The layout must match enum xmlCharEncoding.
*
* Names should match the IANA registry if possible:
* https://www.iana.org/assignments/character-sets/character-sets.xhtml
*/
static const xmlCharEncodingHandler defaultHandlers[31] = {
MAKE_HANDLER(NULL, NULL, NULL), /* NONE */
MAKE_HANDLER("UTF-8", UTF8ToUTF8, UTF8ToUTF8),
MAKE_HANDLER("UTF-16LE", UTF16LEToUTF8, UTF8ToUTF16LE),
MAKE_HANDLER("UTF-16BE", UTF16BEToUTF8, UTF8ToUTF16BE),
MAKE_HANDLER("UCS-4LE", NULL, NULL),
MAKE_HANDLER("UCS-4BE", NULL, NULL),
MAKE_HANDLER("IBM037", NULL, NULL),
MAKE_HANDLER("ISO-10646-UCS-4", NULL, NULL), /* UCS4_2143 */
MAKE_HANDLER("ISO-10646-UCS-4", NULL, NULL), /* UCS4_2143 */
MAKE_HANDLER("ISO-10646-UCS-2", NULL, NULL),
MAKE_HANDLER("ISO-8859-1", latin1ToUTF8, UTF8ToLatin1),
MAKE_ISO_HANDLER("ISO-8859-2", 2),
MAKE_ISO_HANDLER("ISO-8859-3", 3),
MAKE_ISO_HANDLER("ISO-8859-4", 4),
MAKE_ISO_HANDLER("ISO-8859-5", 5),
MAKE_ISO_HANDLER("ISO-8859-6", 6),
MAKE_ISO_HANDLER("ISO-8859-7", 7),
MAKE_ISO_HANDLER("ISO-8859-8", 8),
MAKE_ISO_HANDLER("ISO-8859-9", 9),
MAKE_HANDLER("ISO-2022-JP", NULL, NULL),
MAKE_HANDLER("Shift_JIS", NULL, NULL),
MAKE_HANDLER("EUC-JP", NULL, NULL),
MAKE_HANDLER("US-ASCII", asciiToAscii, asciiToAscii),
MAKE_HANDLER("UTF-16", UTF16LEToUTF8, UTF8ToUTF16),
MAKE_HANDLER("HTML", NULL, UTF8ToHtmlWrapper),
MAKE_ISO_HANDLER("ISO-8859-10", 10),
MAKE_ISO_HANDLER("ISO-8859-11", 11),
MAKE_ISO_HANDLER("ISO-8859-13", 13),
MAKE_ISO_HANDLER("ISO-8859-14", 14),
MAKE_ISO_HANDLER("ISO-8859-15", 15),
MAKE_ISO_HANDLER("ISO-8859-16", 16),
};
#define NUM_DEFAULT_HANDLERS \
(sizeof(defaultHandlers) / sizeof(defaultHandlers[0]))
/* the size should be growable, but it's not a big deal ... */
#define MAX_ENCODING_HANDLERS 50
static xmlCharEncodingHandlerPtr *globalHandlers = NULL;
static int nbCharEncodingHandler = 0;
#ifdef LIBXML_ICONV_ENABLED
static int
xmlCharEncIconv(void *vctxt, const char *name, xmlCharEncConverter *conv);
#endif
#ifdef LIBXML_ICU_ENABLED
static int
xmlCharEncUconv(void *vctxt, const char *name, xmlCharEncConverter *conv);
#endif
/************************************************************************
* *
* Generic encoding handling routines *
* *
************************************************************************/
/**
* xmlDetectCharEncoding:
* @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
*
* 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.
*
* Returns one of the XML_CHAR_ENCODING_... values.
*/
xmlCharEncoding
xmlDetectCharEncoding(const unsigned char* in, int len)
{
if (in == NULL)
return(XML_CHAR_ENCODING_NONE);
if (len >= 4) {
if ((in[0] == 0x00) && (in[1] == 0x00) &&
(in[2] == 0x00) && (in[3] == 0x3C))
return(XML_CHAR_ENCODING_UCS4BE);
if ((in[0] == 0x3C) && (in[1] == 0x00) &&
(in[2] == 0x00) && (in[3] == 0x00))
return(XML_CHAR_ENCODING_UCS4LE);
if ((in[0] == 0x00) && (in[1] == 0x00) &&
(in[2] == 0x3C) && (in[3] == 0x00))
return(XML_CHAR_ENCODING_UCS4_2143);
if ((in[0] == 0x00) && (in[1] == 0x3C) &&
(in[2] == 0x00) && (in[3] == 0x00))
return(XML_CHAR_ENCODING_UCS4_3412);
if ((in[0] == 0x4C) && (in[1] == 0x6F) &&
(in[2] == 0xA7) && (in[3] == 0x94))
return(XML_CHAR_ENCODING_EBCDIC);
if ((in[0] == 0x3C) && (in[1] == 0x3F) &&
(in[2] == 0x78) && (in[3] == 0x6D))
return(XML_CHAR_ENCODING_UTF8);
/*
* Although not part of the recommendation, we also
* attempt an "auto-recognition" of UTF-16LE and
* UTF-16BE encodings.
*/
if ((in[0] == 0x3C) && (in[1] == 0x00) &&
(in[2] == 0x3F) && (in[3] == 0x00))
return(XML_CHAR_ENCODING_UTF16LE);
if ((in[0] == 0x00) && (in[1] == 0x3C) &&
(in[2] == 0x00) && (in[3] == 0x3F))
return(XML_CHAR_ENCODING_UTF16BE);
}
if (len >= 3) {
/*
* Errata on XML-1.0 June 20 2001
* We now allow an UTF8 encoded BOM
*/
if ((in[0] == 0xEF) && (in[1] == 0xBB) &&
(in[2] == 0xBF))
return(XML_CHAR_ENCODING_UTF8);
}
/* For UTF-16 we can recognize by the BOM */
if (len >= 2) {
if ((in[0] == 0xFE) && (in[1] == 0xFF))
return(XML_CHAR_ENCODING_UTF16BE);
if ((in[0] == 0xFF) && (in[1] == 0xFE))
return(XML_CHAR_ENCODING_UTF16LE);
}
return(XML_CHAR_ENCODING_NONE);
}
/**
* xmlCleanupEncodingAliases:
*
* DEPRECATED: This function modifies global state and is not
* thread-safe.
*
* Unregisters all aliases
*/
void
xmlCleanupEncodingAliases(void) {
int i;
if (xmlCharEncodingAliases == NULL)
return;
for (i = 0;i < xmlCharEncodingAliasesNb;i++) {
if (xmlCharEncodingAliases[i].name != NULL)
xmlFree((char *) xmlCharEncodingAliases[i].name);
if (xmlCharEncodingAliases[i].alias != NULL)
xmlFree((char *) xmlCharEncodingAliases[i].alias);
}
xmlCharEncodingAliasesNb = 0;
xmlCharEncodingAliasesMax = 0;
xmlFree(xmlCharEncodingAliases);
xmlCharEncodingAliases = NULL;
}
/**
* xmlGetEncodingAlias:
* @alias: the alias name as parsed, in UTF-8 format (ASCII actually)
*
* DEPRECATED: This function is not thread-safe.
*
* Lookup an encoding name for the given alias.
*
* Returns NULL if not found, otherwise the original name
*/
const char *
xmlGetEncodingAlias(const char *alias) {
int i;
char upper[100];
if (alias == NULL)
return(NULL);
if (xmlCharEncodingAliases == NULL)
return(NULL);
for (i = 0;i < 99;i++) {
upper[i] = (char) toupper((unsigned char) alias[i]);
if (upper[i] == 0) break;
}
upper[i] = 0;
/*
* Walk down the list looking for a definition of the alias
*/
for (i = 0;i < xmlCharEncodingAliasesNb;i++) {
if (!strcmp(xmlCharEncodingAliases[i].alias, upper)) {
return(xmlCharEncodingAliases[i].name);
}
}
return(NULL);
}
/**
* xmlAddEncodingAlias:
* @name: the encoding name as parsed, in UTF-8 format (ASCII actually)
* @alias: the alias name as parsed, in UTF-8 format (ASCII actually)
*
* DEPRECATED: This function modifies global state and is not
* thread-safe.
*
* Registers an alias @alias for an encoding named @name. Existing alias
* will be overwritten.
*
* Returns 0 in case of success, -1 in case of error
*/
int
xmlAddEncodingAlias(const char *name, const char *alias) {
int i;
char upper[100];
char *nameCopy, *aliasCopy;
if ((name == NULL) || (alias == NULL))
return(-1);
for (i = 0;i < 99;i++) {
upper[i] = (char) toupper((unsigned char) alias[i]);
if (upper[i] == 0) break;
}
upper[i] = 0;
if (xmlCharEncodingAliasesNb >= xmlCharEncodingAliasesMax) {
xmlCharEncodingAliasPtr tmp;
size_t newSize = xmlCharEncodingAliasesMax ?
xmlCharEncodingAliasesMax * 2 :
20;
tmp = (xmlCharEncodingAliasPtr)
xmlRealloc(xmlCharEncodingAliases,
newSize * sizeof(xmlCharEncodingAlias));
if (tmp == NULL)
return(-1);
xmlCharEncodingAliases = tmp;
xmlCharEncodingAliasesMax = newSize;
}
/*
* Walk down the list looking for a definition of the alias
*/
for (i = 0;i < xmlCharEncodingAliasesNb;i++) {
if (!strcmp(xmlCharEncodingAliases[i].alias, upper)) {
/*
* Replace the definition.
*/
nameCopy = xmlMemStrdup(name);
if (nameCopy == NULL)
return(-1);
xmlFree((char *) xmlCharEncodingAliases[i].name);
xmlCharEncodingAliases[i].name = nameCopy;
return(0);
}
}
/*
* Add the definition
*/
nameCopy = xmlMemStrdup(name);
if (nameCopy == NULL)
return(-1);
aliasCopy = xmlMemStrdup(upper);
if (aliasCopy == NULL) {
xmlFree(nameCopy);
return(-1);
}
xmlCharEncodingAliases[xmlCharEncodingAliasesNb].name = nameCopy;
xmlCharEncodingAliases[xmlCharEncodingAliasesNb].alias = aliasCopy;
xmlCharEncodingAliasesNb++;
return(0);
}
/**
* xmlDelEncodingAlias:
* @alias: the alias name as parsed, in UTF-8 format (ASCII actually)
*
* DEPRECATED: This function modifies global state and is not
* thread-safe.
*
* Unregisters an encoding alias @alias
*
* Returns 0 in case of success, -1 in case of error
*/
int
xmlDelEncodingAlias(const char *alias) {
int i;
if (alias == NULL)
return(-1);
if (xmlCharEncodingAliases == NULL)
return(-1);
/*
* Walk down the list looking for a definition of the alias
*/
for (i = 0;i < xmlCharEncodingAliasesNb;i++) {
if (!strcmp(xmlCharEncodingAliases[i].alias, alias)) {
xmlFree((char *) xmlCharEncodingAliases[i].name);
xmlFree((char *) xmlCharEncodingAliases[i].alias);
xmlCharEncodingAliasesNb--;
memmove(&xmlCharEncodingAliases[i], &xmlCharEncodingAliases[i + 1],
sizeof(xmlCharEncodingAlias) * (xmlCharEncodingAliasesNb - i));
return(0);
}
}
return(-1);
}
static int
xmlCompareEncTableEntries(const void *vkey, const void *ventry) {
const char *key = vkey;
const xmlEncTableEntry *entry = ventry;
return(xmlStrcasecmp(BAD_CAST key, BAD_CAST entry->name));
}
static xmlCharEncoding
xmlParseCharEncodingInternal(const char *name)
{
const xmlEncTableEntry *entry;
if (name == NULL)
return(XML_CHAR_ENCODING_NONE);
entry = bsearch(name, xmlEncTable,
sizeof(xmlEncTable) / sizeof(xmlEncTable[0]),
sizeof(xmlEncTable[0]), xmlCompareEncTableEntries);
if (entry != NULL)
return(entry->enc);
return(XML_CHAR_ENCODING_ERROR);
}
/**
* xmlParseCharEncoding:
* @name: the encoding name as parsed, in UTF-8 format (ASCII actually)
*
* 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.
*
* Returns one of the XML_CHAR_ENCODING_... values or XML_CHAR_ENCODING_NONE
* if not recognized.
*/
xmlCharEncoding
xmlParseCharEncoding(const char *name)
{
xmlCharEncoding enc = xmlParseCharEncodingInternal(name);
/* Backward compatibility */
if (enc == XML_CHAR_ENCODING_UTF16)
enc = XML_CHAR_ENCODING_UTF16LE;
return(enc);
}
/**
* xmlGetCharEncodingName:
* @enc: the encoding
*
* The "canonical" name for XML encoding.
* C.f. http://www.w3.org/TR/REC-xml#charencoding
* Section 4.3.3 Character Encoding in Entities
*
* Returns the canonical name for the given encoding
*/
const char*
xmlGetCharEncodingName(xmlCharEncoding enc) {
switch (enc) {
case XML_CHAR_ENCODING_UTF16LE:
return("UTF-16");
case XML_CHAR_ENCODING_UTF16BE:
return("UTF-16");
case XML_CHAR_ENCODING_UCS4LE:
return("ISO-10646-UCS-4");
case XML_CHAR_ENCODING_UCS4BE:
return("ISO-10646-UCS-4");
default:
break;
}
if ((enc <= 0) || ((size_t) enc >= NUM_DEFAULT_HANDLERS))
return(NULL);
return(defaultHandlers[enc].name);
}
/************************************************************************
* *
* Char encoding handlers *
* *
************************************************************************/
/**
* xmlNewCharEncodingHandler:
* @name: the encoding name, in UTF-8 format (ASCII actually)
* @input: the xmlCharEncodingInputFunc to read that encoding
* @output: the xmlCharEncodingOutputFunc to write that encoding
*
* DEPRECATED: This function modifies global state and is not
* thread-safe.
*
* Create and registers an xmlCharEncodingHandler.
*
* Returns the xmlCharEncodingHandlerPtr created (or NULL in case of error).
*/
xmlCharEncodingHandlerPtr
xmlNewCharEncodingHandler(const char *name,
xmlCharEncodingInputFunc input,
xmlCharEncodingOutputFunc output) {
xmlCharEncodingHandlerPtr handler;
const char *alias;
char upper[500];
int i;
char *up = NULL;
/*
* Do the alias resolution
*/
alias = xmlGetEncodingAlias(name);
if (alias != NULL)
name = alias;
/*
* Keep only the uppercase version of the encoding.
*/
if (name == NULL)
return(NULL);
for (i = 0;i < 499;i++) {
upper[i] = (char) toupper((unsigned char) name[i]);
if (upper[i] == 0) break;
}
upper[i] = 0;
up = xmlMemStrdup(upper);
if (up == NULL)
return(NULL);
/*
* allocate and fill-up an handler block.
*/
handler = (xmlCharEncodingHandlerPtr)
xmlMalloc(sizeof(xmlCharEncodingHandler));
if (handler == NULL) {
xmlFree(up);
return(NULL);
}
memset(handler, 0, sizeof(xmlCharEncodingHandler));
handler->input = input;
handler->output = output;
handler->name = up;
handler->flags = XML_HANDLER_STATIC;
#ifdef LIBXML_ICONV_ENABLED
handler->iconv_in = NULL;
handler->iconv_out = NULL;
#endif
/*
* registers and returns the handler.
*/
xmlRegisterCharEncodingHandler(handler);
return(handler);
}
/**
* xmlInitCharEncodingHandlers:
*
* DEPRECATED: Alias for xmlInitParser.
*/
void
xmlInitCharEncodingHandlers(void) {
xmlInitParser();
}
/**
* xmlInitEncodingInternal:
*
* Initialize the char encoding support.
*/
void
xmlInitEncodingInternal(void) {
unsigned short int tst = 0x1234;
unsigned char *ptr = (unsigned char *) &tst;
if (*ptr == 0x12) xmlLittleEndian = 0;
else xmlLittleEndian = 1;
}
/**
* xmlCleanupCharEncodingHandlers:
*
* 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.
*/
void
xmlCleanupCharEncodingHandlers(void) {
xmlCleanupEncodingAliases();
if (globalHandlers == NULL) return;
for (;nbCharEncodingHandler > 0;) {
xmlCharEncodingHandler *handler;
nbCharEncodingHandler--;
handler = globalHandlers[nbCharEncodingHandler];
if (handler != NULL) {
if (handler->name != NULL)
xmlFree(handler->name);
xmlFree(handler);
}
}
xmlFree(globalHandlers);
globalHandlers = NULL;
nbCharEncodingHandler = 0;
}
/**
* xmlRegisterCharEncodingHandler:
* @handler: the xmlCharEncodingHandlerPtr handler block
*
* DEPRECATED: This function modifies global state and is not
* thread-safe.
*
* Register the char encoding handler.
*/
void
xmlRegisterCharEncodingHandler(xmlCharEncodingHandlerPtr handler) {
if (handler == NULL)
return;
if (globalHandlers == NULL) {
globalHandlers = xmlMalloc(
MAX_ENCODING_HANDLERS * sizeof(globalHandlers[0]));
if (globalHandlers == NULL)
goto free_handler;
}
if (nbCharEncodingHandler >= MAX_ENCODING_HANDLERS)
goto free_handler;
globalHandlers[nbCharEncodingHandler++] = handler;
return;
free_handler:
if (handler != NULL) {
if (handler->name != NULL) {
xmlFree(handler->name);
}
xmlFree(handler);
}
}
static int
xmlInvokeConvImpl(xmlCharEncConvImpl impl, void *implCtxt,
const char *name, xmlCharEncodingHandler *handler) {
xmlCharEncConverter conv = { NULL, NULL, NULL, NULL, NULL };
int ret;
ret = impl(implCtxt, name, &conv);
if (ret == XML_ERR_OK) {
handler->input =
(xmlCharEncodingInputFunc) (void (*)(void)) conv.input;
handler->output =
(xmlCharEncodingOutputFunc) (void (*)(void)) conv.output;
handler->ctxtDtor = conv.ctxtDtor;
handler->inputCtxt = conv.inputCtxt;
handler->outputCtxt = conv.outputCtxt;
}
return(ret);
}
/**
* xmlFindExtraHandler:
* @norig: name of the char encoding
* @name: potentially aliased name of the encoding
* @output: boolean, use handler for output
* @impl: a conversion implementation (optional)
* @implCtxt: user data for conversion implementation (optional)
* @out: pointer to resulting handler
*
* Search the non-default handlers for an exact match.
*
* Returns an xmlParserErrors error code.
*/
static int
xmlFindExtraHandler(const char *norig, const char *name, int output,
xmlCharEncConvImpl impl, void *implCtxt,
xmlCharEncodingHandler **out) {
xmlCharEncodingHandler *handler;
int ret;
int i;
handler = xmlMalloc(sizeof(*handler));
if (handler == NULL)
return(XML_ERR_NO_MEMORY);
memset(handler, 0, sizeof(*handler));
handler->name = xmlMemStrdup(name);
if (handler->name == NULL) {
ret = XML_ERR_NO_MEMORY;
goto done;
}
/*
* Try custom implementation before deprecated global handlers.
*
* Note that we pass the original name without deprecated
* alias resolution.
*/
if (impl != NULL) {
ret = xmlInvokeConvImpl(impl, implCtxt, norig, handler);
if (ret != XML_ERR_OK)
goto done;
*out = handler;
return(XML_ERR_OK);
}
/*
* Deprecated
*/
if (globalHandlers != NULL) {
for (i = 0; i < nbCharEncodingHandler; i++) {
xmlCharEncodingHandler *h = globalHandlers[i];
if (!xmlStrcasecmp((const xmlChar *) name,
(const xmlChar *) h->name)) {
if ((output ? h->output : h->input) != NULL) {
*out = h;
ret = XML_ERR_OK;
goto done;
}
}
}
}
#ifdef LIBXML_ICONV_ENABLED
ret = xmlInvokeConvImpl(xmlCharEncIconv, handler, name, handler);
if (ret == XML_ERR_OK) {
*out = handler;
return(XML_ERR_OK);
}
if (ret != XML_ERR_UNSUPPORTED_ENCODING)
goto done;
#endif /* LIBXML_ICONV_ENABLED */
#ifdef LIBXML_ICU_ENABLED
ret = xmlInvokeConvImpl(xmlCharEncUconv, handler, name, handler);
if (ret == XML_ERR_OK) {
*out = handler;
return(XML_ERR_OK);
}
if (ret != XML_ERR_UNSUPPORTED_ENCODING)
goto done;
#endif /* LIBXML_ICU_ENABLED */
ret = XML_ERR_UNSUPPORTED_ENCODING;
done:
if (handler != NULL) {
xmlFree(handler->name);
xmlFree(handler);
}
return(ret);
}
/**
* xmlLookupCharEncodingHandler:
* @enc: an xmlCharEncoding value.
* @out: pointer to result
*
* Find or create a handler matching the encoding. The following
* converters are looked up in order:
*
* - Built-in handler (UTF-8, UTF-16, ISO-8859-1, ASCII)
* - User-registered global handler (deprecated)
* - iconv if enabled
* - ICU if enabled
*
* The handler must be closed with xmlCharEncCloseFunc.
*
* If the encoding is UTF-8, a NULL handler and no error code will
* be returned.
*
* Available since 2.13.0.
*
* Returns XML_ERR_OK, XML_ERR_UNSUPPORTED_ENCODING or another
* xmlParserErrors error code.
*/
int
xmlLookupCharEncodingHandler(xmlCharEncoding enc,
xmlCharEncodingHandler **out) {
const xmlCharEncodingHandler *handler;
if (out == NULL)
return(XML_ERR_ARGUMENT);
*out = NULL;
if ((enc <= 0) || ((size_t) enc >= NUM_DEFAULT_HANDLERS))
return(XML_ERR_UNSUPPORTED_ENCODING);
/* Return NULL handler for UTF-8 */
if ((enc == XML_CHAR_ENCODING_UTF8) ||
(enc == XML_CHAR_ENCODING_NONE))
return(XML_ERR_OK);
handler = &defaultHandlers[enc];
if ((handler->input != NULL) || (handler->output != NULL)) {
*out = (xmlCharEncodingHandler *) handler;
return(XML_ERR_OK);
}
if (handler->name != NULL)
return(xmlFindExtraHandler(handler->name, handler->name, 0,
NULL, NULL, out));
return(XML_ERR_UNSUPPORTED_ENCODING);
}
/**
* xmlGetCharEncodingHandler:
* @enc: an xmlCharEncoding value.
*
* DEPRECATED: Use xmlLookupCharEncodingHandler which has better error
* reporting.
*
* Returns the handler or NULL if no handler was found or an error
* occurred.
*/
xmlCharEncodingHandlerPtr
xmlGetCharEncodingHandler(xmlCharEncoding enc) {
xmlCharEncodingHandler *ret;
xmlLookupCharEncodingHandler(enc, &ret);
return(ret);
}
/**
* xmlCreateCharEncodingHandler:
* @name: a string describing the char encoding.
* @output: boolean, use handler for output
* @impl: a conversion implementation (optional)
* @implCtxt: user data for conversion implementation (optional)
* @out: pointer to result
*
* Find or create a handler matching the encoding. The following
* converters are looked up in order:
*
* - Built-in handler (UTF-8, UTF-16, ISO-8859-1, ASCII)
* - Custom implementation if provided
* - User-registered global handler (deprecated)
* - iconv if enabled
* - ICU if enabled
*
* The handler must be closed with xmlCharEncCloseFunc.
*
* If the encoding is UTF-8, a NULL handler and no error code will
* be returned.
*
* Available since 2.14.0.
*
* Returns XML_ERR_OK, XML_ERR_UNSUPPORTED_ENCODING or another
* xmlParserErrors error code.
*/
int
xmlCreateCharEncodingHandler(const char *name, int output,
xmlCharEncConvImpl impl, void *implCtxt,
xmlCharEncodingHandler **out) {
const xmlCharEncodingHandler *handler;
const char *norig, *nalias;
xmlCharEncoding enc;
if (out == NULL)
return(XML_ERR_ARGUMENT);
*out = NULL;
if (name == NULL)
return(XML_ERR_ARGUMENT);
norig = name;
nalias = xmlGetEncodingAlias(name);
if (nalias != NULL)
name = nalias;
enc = xmlParseCharEncodingInternal(name);
/* Return NULL handler for UTF-8 */
if (enc == XML_CHAR_ENCODING_UTF8)
return(XML_ERR_OK);
if ((enc > 0) && ((size_t) enc < NUM_DEFAULT_HANDLERS)) {
handler = &defaultHandlers[enc];
if ((output ? handler->output : handler->input) != NULL) {
*out = (xmlCharEncodingHandler *) handler;