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parser.c
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/*
* parser.c : an XML 1.0 parser, namespaces and validity support are mostly
* implemented on top of the SAX interfaces
*
* References:
* The XML specification:
* http://www.w3.org/TR/REC-xml
* Original 1.0 version:
* http://www.w3.org/TR/1998/REC-xml-19980210
* XML second edition working draft
* http://www.w3.org/TR/2000/WD-xml-2e-20000814
*
* Okay this is a big file, the parser core is around 7000 lines, then it
* is followed by the progressive parser top routines, then the various
* high level APIs to call the parser and a few miscellaneous functions.
* A number of helper functions and deprecated ones have been moved to
* parserInternals.c to reduce this file size.
* As much as possible the functions are associated with their relative
* production in the XML specification. A few productions defining the
* different ranges of character are actually implanted either in
* parserInternals.h or parserInternals.c
* The DOM tree build is realized from the default SAX callbacks in
* the module SAX2.c.
* The routines doing the validation checks are in valid.c and called either
* from the SAX callbacks or as standalone functions using a preparsed
* document.
*
* See Copyright for the status of this software.
*
*/
/* To avoid EBCDIC trouble when parsing on zOS */
#if defined(__MVS__)
#pragma convert("ISO8859-1")
#endif
#define IN_LIBXML
#include "libxml.h"
#if defined(_WIN32)
#define XML_DIR_SEP '\\'
#else
#define XML_DIR_SEP '/'
#endif
#include <stdlib.h>
#include <limits.h>
#include <string.h>
#include <stdarg.h>
#include <stddef.h>
#include <ctype.h>
#include <stdlib.h>
#include <libxml/parser.h>
#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/parserInternals.h>
#include <libxml/valid.h>
#include <libxml/entities.h>
#include <libxml/xmlerror.h>
#include <libxml/encoding.h>
#include <libxml/xmlIO.h>
#include <libxml/uri.h>
#include <libxml/SAX2.h>
#include <libxml/HTMLparser.h>
#ifdef LIBXML_CATALOG_ENABLED
#include <libxml/catalog.h>
#endif
#include "private/buf.h"
#include "private/dict.h"
#include "private/entities.h"
#include "private/error.h"
#include "private/html.h"
#include "private/io.h"
#include "private/memory.h"
#include "private/parser.h"
#define NS_INDEX_EMPTY INT_MAX
#define NS_INDEX_XML (INT_MAX - 1)
#define URI_HASH_EMPTY 0xD943A04E
#define URI_HASH_XML 0xF0451F02
#ifndef STDIN_FILENO
#define STDIN_FILENO 0
#endif
#ifndef SIZE_MAX
#define SIZE_MAX ((size_t) -1)
#endif
#define XML_MAX_ATTRS 100000000 /* 100 million */
struct _xmlStartTag {
const xmlChar *prefix;
const xmlChar *URI;
int line;
int nsNr;
};
typedef struct {
void *saxData;
unsigned prefixHashValue;
unsigned uriHashValue;
unsigned elementId;
int oldIndex;
} xmlParserNsExtra;
typedef struct {
unsigned hashValue;
int index;
} xmlParserNsBucket;
struct _xmlParserNsData {
xmlParserNsExtra *extra;
unsigned hashSize;
unsigned hashElems;
xmlParserNsBucket *hash;
unsigned elementId;
int defaultNsIndex;
int minNsIndex;
};
static int
xmlParseElementStart(xmlParserCtxtPtr ctxt);
static void
xmlParseElementEnd(xmlParserCtxtPtr ctxt);
static xmlEntityPtr
xmlLookupGeneralEntity(xmlParserCtxtPtr ctxt, const xmlChar *name, int inAttr);
static const xmlChar *
xmlParseEntityRefInternal(xmlParserCtxtPtr ctxt);
/************************************************************************
* *
* Arbitrary limits set in the parser. See XML_PARSE_HUGE *
* *
************************************************************************/
#define XML_PARSER_BIG_ENTITY 1000
#define XML_PARSER_LOT_ENTITY 5000
/*
* Constants for protection against abusive entity expansion
* ("billion laughs").
*/
/*
* A certain amount of entity expansion which is always allowed.
*/
#define XML_PARSER_ALLOWED_EXPANSION 1000000
/*
* Fixed cost for each entity reference. This crudely models processing time
* as well to protect, for example, against exponential expansion of empty
* or very short entities.
*/
#define XML_ENT_FIXED_COST 20
/**
* xmlParserMaxDepth:
*
* arbitrary depth limit for the XML documents that we allow to
* process. This is not a limitation of the parser but a safety
* boundary feature. It can be disabled with the XML_PARSE_HUGE
* parser option.
*/
const unsigned int xmlParserMaxDepth = 256;
#define XML_PARSER_BIG_BUFFER_SIZE 300
#define XML_PARSER_BUFFER_SIZE 100
#define SAX_COMPAT_MODE BAD_CAST "SAX compatibility mode document"
/**
* XML_PARSER_CHUNK_SIZE
*
* When calling GROW that's the minimal amount of data
* the parser expected to have received. It is not a hard
* limit but an optimization when reading strings like Names
* It is not strictly needed as long as inputs available characters
* are followed by 0, which should be provided by the I/O level
*/
#define XML_PARSER_CHUNK_SIZE 100
/**
* xmlParserVersion:
*
* Constant string describing the internal version of the library
*/
const char *const
xmlParserVersion = LIBXML_VERSION_STRING LIBXML_VERSION_EXTRA;
/*
* List of XML prefixed PI allowed by W3C specs
*/
static const char* const xmlW3CPIs[] = {
"xml-stylesheet",
"xml-model",
NULL
};
/* DEPR void xmlParserHandleReference(xmlParserCtxtPtr ctxt); */
static xmlEntityPtr xmlParseStringPEReference(xmlParserCtxtPtr ctxt,
const xmlChar **str);
static void
xmlCtxtParseEntity(xmlParserCtxtPtr ctxt, xmlEntityPtr ent);
static int
xmlLoadEntityContent(xmlParserCtxtPtr ctxt, xmlEntityPtr entity);
/************************************************************************
* *
* Some factorized error routines *
* *
************************************************************************/
static void
xmlErrMemory(xmlParserCtxtPtr ctxt) {
xmlCtxtErrMemory(ctxt);
}
/**
* xmlErrAttributeDup:
* @ctxt: an XML parser context
* @prefix: the attribute prefix
* @localname: the attribute localname
*
* Handle a redefinition of attribute error
*/
static void
xmlErrAttributeDup(xmlParserCtxtPtr ctxt, const xmlChar * prefix,
const xmlChar * localname)
{
if (prefix == NULL)
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, XML_ERR_ATTRIBUTE_REDEFINED,
XML_ERR_FATAL, localname, NULL, NULL, 0,
"Attribute %s redefined\n", localname);
else
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, XML_ERR_ATTRIBUTE_REDEFINED,
XML_ERR_FATAL, prefix, localname, NULL, 0,
"Attribute %s:%s redefined\n", prefix, localname);
}
/**
* xmlFatalErrMsg:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the error message
*
* Handle a fatal parser error, i.e. violating Well-Formedness constraints
*/
static void LIBXML_ATTR_FORMAT(3,0)
xmlFatalErrMsg(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg)
{
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_FATAL,
NULL, NULL, NULL, 0, "%s", msg);
}
/**
* xmlWarningMsg:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the error message
* @str1: extra data
* @str2: extra data
*
* Handle a warning.
*/
void LIBXML_ATTR_FORMAT(3,0)
xmlWarningMsg(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg, const xmlChar *str1, const xmlChar *str2)
{
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_WARNING,
str1, str2, NULL, 0, msg, str1, str2);
}
/**
* xmlValidityError:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the error message
* @str1: extra data
*
* Handle a validity error.
*/
static void LIBXML_ATTR_FORMAT(3,0)
xmlValidityError(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg, const xmlChar *str1, const xmlChar *str2)
{
ctxt->valid = 0;
xmlCtxtErr(ctxt, NULL, XML_FROM_DTD, error, XML_ERR_ERROR,
str1, str2, NULL, 0, msg, str1, str2);
}
/**
* xmlFatalErrMsgInt:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the error message
* @val: an integer value
*
* Handle a fatal parser error, i.e. violating Well-Formedness constraints
*/
static void LIBXML_ATTR_FORMAT(3,0)
xmlFatalErrMsgInt(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg, int val)
{
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_FATAL,
NULL, NULL, NULL, val, msg, val);
}
/**
* xmlFatalErrMsgStrIntStr:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the error message
* @str1: an string info
* @val: an integer value
* @str2: an string info
*
* Handle a fatal parser error, i.e. violating Well-Formedness constraints
*/
static void LIBXML_ATTR_FORMAT(3,0)
xmlFatalErrMsgStrIntStr(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg, const xmlChar *str1, int val,
const xmlChar *str2)
{
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_FATAL,
str1, str2, NULL, val, msg, str1, val, str2);
}
/**
* xmlFatalErrMsgStr:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the error message
* @val: a string value
*
* Handle a fatal parser error, i.e. violating Well-Formedness constraints
*/
static void LIBXML_ATTR_FORMAT(3,0)
xmlFatalErrMsgStr(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg, const xmlChar * val)
{
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_FATAL,
val, NULL, NULL, 0, msg, val);
}
/**
* xmlErrMsgStr:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the error message
* @val: a string value
*
* Handle a non fatal parser error
*/
static void LIBXML_ATTR_FORMAT(3,0)
xmlErrMsgStr(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg, const xmlChar * val)
{
xmlCtxtErr(ctxt, NULL, XML_FROM_PARSER, error, XML_ERR_ERROR,
val, NULL, NULL, 0, msg, val);
}
/**
* xmlNsErr:
* @ctxt: an XML parser context
* @error: the error number
* @msg: the message
* @info1: extra information string
* @info2: extra information string
*
* Handle a fatal parser error, i.e. violating Well-Formedness constraints
*/
static void LIBXML_ATTR_FORMAT(3,0)
xmlNsErr(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg,
const xmlChar * info1, const xmlChar * info2,
const xmlChar * info3)
{
ctxt->nsWellFormed = 0;
xmlCtxtErr(ctxt, NULL, XML_FROM_NAMESPACE, error, XML_ERR_ERROR,
info1, info2, info3, 0, msg, info1, info2, info3);
}
/**
* xmlNsWarn
* @ctxt: an XML parser context
* @error: the error number
* @msg: the message
* @info1: extra information string
* @info2: extra information string
*
* Handle a namespace warning error
*/
static void LIBXML_ATTR_FORMAT(3,0)
xmlNsWarn(xmlParserCtxtPtr ctxt, xmlParserErrors error,
const char *msg,
const xmlChar * info1, const xmlChar * info2,
const xmlChar * info3)
{
xmlCtxtErr(ctxt, NULL, XML_FROM_NAMESPACE, error, XML_ERR_WARNING,
info1, info2, info3, 0, msg, info1, info2, info3);
}
static void
xmlSaturatedAdd(unsigned long *dst, unsigned long val) {
if (val > ULONG_MAX - *dst)
*dst = ULONG_MAX;
else
*dst += val;
}
static void
xmlSaturatedAddSizeT(unsigned long *dst, unsigned long val) {
if (val > ULONG_MAX - *dst)
*dst = ULONG_MAX;
else
*dst += val;
}
/**
* xmlParserEntityCheck:
* @ctxt: parser context
* @extra: sum of unexpanded entity sizes
*
* Check for non-linear entity expansion behaviour.
*
* In some cases like xmlExpandEntityInAttValue, this function is called
* for each, possibly nested entity and its unexpanded content length.
*
* In other cases like xmlParseReference, it's only called for each
* top-level entity with its unexpanded content length plus the sum of
* the unexpanded content lengths (plus fixed cost) of all nested
* entities.
*
* Summing the unexpanded lengths also adds the length of the reference.
* This is by design. Taking the length of the entity name into account
* discourages attacks that try to waste CPU time with abusively long
* entity names. See test/recurse/lol6.xml for example. Each call also
* adds some fixed cost XML_ENT_FIXED_COST to discourage attacks with
* short entities.
*
* Returns 1 on error, 0 on success.
*/
static int
xmlParserEntityCheck(xmlParserCtxtPtr ctxt, unsigned long extra)
{
unsigned long consumed;
unsigned long *expandedSize;
xmlParserInputPtr input = ctxt->input;
xmlEntityPtr entity = input->entity;
if ((entity) && (entity->flags & XML_ENT_CHECKED))
return(0);
/*
* Compute total consumed bytes so far, including input streams of
* external entities.
*/
consumed = input->consumed;
xmlSaturatedAddSizeT(&consumed, input->cur - input->base);
xmlSaturatedAdd(&consumed, ctxt->sizeentities);
if (entity)
expandedSize = &entity->expandedSize;
else
expandedSize = &ctxt->sizeentcopy;
/*
* Add extra cost and some fixed cost.
*/
xmlSaturatedAdd(expandedSize, extra);
xmlSaturatedAdd(expandedSize, XML_ENT_FIXED_COST);
/*
* It's important to always use saturation arithmetic when tracking
* entity sizes to make the size checks reliable. If "sizeentcopy"
* overflows, we have to abort.
*/
if ((*expandedSize > XML_PARSER_ALLOWED_EXPANSION) &&
((*expandedSize >= ULONG_MAX) ||
(*expandedSize / ctxt->maxAmpl > consumed))) {
xmlFatalErrMsg(ctxt, XML_ERR_RESOURCE_LIMIT,
"Maximum entity amplification factor exceeded, see "
"xmlCtxtSetMaxAmplification.\n");
xmlHaltParser(ctxt);
return(1);
}
return(0);
}
/************************************************************************
* *
* Library wide options *
* *
************************************************************************/
/**
* xmlHasFeature:
* @feature: the feature to be examined
*
* Examines if the library has been compiled with a given feature.
*
* Returns a non-zero value if the feature exist, otherwise zero.
* Returns zero (0) if the feature does not exist or an unknown
* unknown feature is requested, non-zero otherwise.
*/
int
xmlHasFeature(xmlFeature feature)
{
switch (feature) {
case XML_WITH_THREAD:
#ifdef LIBXML_THREAD_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_TREE:
return(1);
case XML_WITH_OUTPUT:
#ifdef LIBXML_OUTPUT_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_PUSH:
#ifdef LIBXML_PUSH_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_READER:
#ifdef LIBXML_READER_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_PATTERN:
#ifdef LIBXML_PATTERN_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_WRITER:
#ifdef LIBXML_WRITER_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_SAX1:
#ifdef LIBXML_SAX1_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_HTTP:
#ifdef LIBXML_HTTP_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_VALID:
#ifdef LIBXML_VALID_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_HTML:
#ifdef LIBXML_HTML_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_LEGACY:
#ifdef LIBXML_LEGACY_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_C14N:
#ifdef LIBXML_C14N_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_CATALOG:
#ifdef LIBXML_CATALOG_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_XPATH:
#ifdef LIBXML_XPATH_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_XPTR:
#ifdef LIBXML_XPTR_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_XINCLUDE:
#ifdef LIBXML_XINCLUDE_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_ICONV:
#ifdef LIBXML_ICONV_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_ISO8859X:
#ifdef LIBXML_ISO8859X_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_UNICODE:
#ifdef LIBXML_UNICODE_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_REGEXP:
#ifdef LIBXML_REGEXP_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_AUTOMATA:
#ifdef LIBXML_REGEXP_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_EXPR:
#ifdef LIBXML_EXPR_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_SCHEMAS:
#ifdef LIBXML_SCHEMAS_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_SCHEMATRON:
#ifdef LIBXML_SCHEMATRON_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_MODULES:
#ifdef LIBXML_MODULES_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_DEBUG:
#ifdef LIBXML_DEBUG_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_DEBUG_MEM:
return(0);
case XML_WITH_ZLIB:
#ifdef LIBXML_ZLIB_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_LZMA:
#ifdef LIBXML_LZMA_ENABLED
return(1);
#else
return(0);
#endif
case XML_WITH_ICU:
#ifdef LIBXML_ICU_ENABLED
return(1);
#else
return(0);
#endif
default:
break;
}
return(0);
}
/************************************************************************
* *
* Simple string buffer *
* *
************************************************************************/
typedef struct {
xmlChar *mem;
unsigned size;
unsigned cap; /* size < cap */
unsigned max; /* size <= max */
xmlParserErrors code;
} xmlSBuf;
static void
xmlSBufInit(xmlSBuf *buf, unsigned max) {
buf->mem = NULL;
buf->size = 0;
buf->cap = 0;
buf->max = max;
buf->code = XML_ERR_OK;
}
static int
xmlSBufGrow(xmlSBuf *buf, unsigned len) {
xmlChar *mem;
unsigned cap;
if (len >= UINT_MAX / 2 - buf->size) {
if (buf->code == XML_ERR_OK)
buf->code = XML_ERR_RESOURCE_LIMIT;
return(-1);
}
cap = (buf->size + len) * 2;
if (cap < 240)
cap = 240;
mem = xmlRealloc(buf->mem, cap);
if (mem == NULL) {
buf->code = XML_ERR_NO_MEMORY;
return(-1);
}
buf->mem = mem;
buf->cap = cap;
return(0);
}
static void
xmlSBufAddString(xmlSBuf *buf, const xmlChar *str, unsigned len) {
if (buf->max - buf->size < len) {
if (buf->code == XML_ERR_OK)
buf->code = XML_ERR_RESOURCE_LIMIT;
return;
}
if (buf->cap - buf->size <= len) {
if (xmlSBufGrow(buf, len) < 0)
return;
}
if (len > 0)
memcpy(buf->mem + buf->size, str, len);
buf->size += len;
}
static void
xmlSBufAddCString(xmlSBuf *buf, const char *str, unsigned len) {
xmlSBufAddString(buf, (const xmlChar *) str, len);
}
static void
xmlSBufAddChar(xmlSBuf *buf, int c) {
xmlChar *end;
if (buf->max - buf->size < 4) {
if (buf->code == XML_ERR_OK)
buf->code = XML_ERR_RESOURCE_LIMIT;
return;
}
if (buf->cap - buf->size <= 4) {
if (xmlSBufGrow(buf, 4) < 0)
return;
}
end = buf->mem + buf->size;
if (c < 0x80) {
*end = (xmlChar) c;
buf->size += 1;
} else {
buf->size += xmlCopyCharMultiByte(end, c);
}
}
static void
xmlSBufAddReplChar(xmlSBuf *buf) {
xmlSBufAddCString(buf, "\xEF\xBF\xBD", 3);
}
static void
xmlSBufReportError(xmlSBuf *buf, xmlParserCtxtPtr ctxt, const char *errMsg) {
if (buf->code == XML_ERR_NO_MEMORY)
xmlCtxtErrMemory(ctxt);
else
xmlFatalErr(ctxt, buf->code, errMsg);
}
static xmlChar *
xmlSBufFinish(xmlSBuf *buf, int *sizeOut, xmlParserCtxtPtr ctxt,
const char *errMsg) {
if (buf->mem == NULL) {
buf->mem = xmlMalloc(1);
if (buf->mem == NULL) {
buf->code = XML_ERR_NO_MEMORY;
} else {
buf->mem[0] = 0;
}
} else {
buf->mem[buf->size] = 0;
}
if (buf->code == XML_ERR_OK) {
if (sizeOut != NULL)
*sizeOut = buf->size;
return(buf->mem);
}
xmlSBufReportError(buf, ctxt, errMsg);
xmlFree(buf->mem);
if (sizeOut != NULL)
*sizeOut = 0;
return(NULL);
}
static void
xmlSBufCleanup(xmlSBuf *buf, xmlParserCtxtPtr ctxt, const char *errMsg) {
if (buf->code != XML_ERR_OK)
xmlSBufReportError(buf, ctxt, errMsg);
xmlFree(buf->mem);
}
static int
xmlUTF8MultibyteLen(xmlParserCtxtPtr ctxt, const xmlChar *str,
const char *errMsg) {
int c = str[0];
int c1 = str[1];
if ((c1 & 0xC0) != 0x80)
goto encoding_error;
if (c < 0xE0) {
/* 2-byte sequence */
if (c < 0xC2)
goto encoding_error;
return(2);
} else {
int c2 = str[2];
if ((c2 & 0xC0) != 0x80)
goto encoding_error;
if (c < 0xF0) {
/* 3-byte sequence */
if (c == 0xE0) {
/* overlong */
if (c1 < 0xA0)
goto encoding_error;
} else if (c == 0xED) {
/* surrogate */
if (c1 >= 0xA0)
goto encoding_error;
} else if (c == 0xEF) {
/* U+FFFE and U+FFFF are invalid Chars */
if ((c1 == 0xBF) && (c2 >= 0xBE))
xmlFatalErrMsg(ctxt, XML_ERR_INVALID_CHAR, errMsg);
}
return(3);
} else {
/* 4-byte sequence */
if ((str[3] & 0xC0) != 0x80)
goto encoding_error;
if (c == 0xF0) {
/* overlong */
if (c1 < 0x90)
goto encoding_error;
} else if (c >= 0xF4) {
/* greater than 0x10FFFF */
if ((c > 0xF4) || (c1 >= 0x90))
goto encoding_error;
}
return(4);
}
}
encoding_error:
/* Only report the first error */
if ((ctxt->input->flags & XML_INPUT_ENCODING_ERROR) == 0) {
xmlCtxtErrIO(ctxt, XML_ERR_INVALID_ENCODING, NULL);
ctxt->input->flags |= XML_INPUT_ENCODING_ERROR;
}
return(0);
}
/************************************************************************
* *
* SAX2 defaulted attributes handling *
* *
************************************************************************/
/**
* xmlCtxtInitializeLate:
* @ctxt: an XML parser context
*
* Final initialization of the parser context before starting to parse.
*
* This accounts for users modifying struct members of parser context
* directly.
*/
static void
xmlCtxtInitializeLate(xmlParserCtxtPtr ctxt) {
xmlSAXHandlerPtr sax;
/* Avoid unused variable warning if features are disabled. */
(void) sax;
/*
* Changing the SAX struct directly is still widespread practice
* in internal and external code.
*/
if (ctxt == NULL) return;
sax = ctxt->sax;
#ifdef LIBXML_SAX1_ENABLED
/*
* Only enable SAX2 if there SAX2 element handlers, except when there
* are no element handlers at all.
*/
if (((ctxt->options & XML_PARSE_SAX1) == 0) &&
(sax) &&
(sax->initialized == XML_SAX2_MAGIC) &&
((sax->startElementNs != NULL) ||
(sax->endElementNs != NULL) ||
((sax->startElement == NULL) && (sax->endElement == NULL))))
ctxt->sax2 = 1;
#else
ctxt->sax2 = 1;
#endif /* LIBXML_SAX1_ENABLED */
/*
* Some users replace the dictionary directly in the context struct.
* We really need an API function to do that cleanly.
*/
ctxt->str_xml = xmlDictLookup(ctxt->dict, BAD_CAST "xml", 3);
ctxt->str_xmlns = xmlDictLookup(ctxt->dict, BAD_CAST "xmlns", 5);
ctxt->str_xml_ns = xmlDictLookup(ctxt->dict, XML_XML_NAMESPACE, 36);
if ((ctxt->str_xml==NULL) || (ctxt->str_xmlns==NULL) ||
(ctxt->str_xml_ns == NULL)) {
xmlErrMemory(ctxt);
}
xmlDictSetLimit(ctxt->dict,
(ctxt->options & XML_PARSE_HUGE) ?
0 :
XML_MAX_DICTIONARY_LIMIT);
}
typedef struct {
xmlHashedString prefix;
xmlHashedString name;
xmlHashedString value;
const xmlChar *valueEnd;
int external;
int expandedSize;
} xmlDefAttr;
typedef struct _xmlDefAttrs xmlDefAttrs;
typedef xmlDefAttrs *xmlDefAttrsPtr;
struct _xmlDefAttrs {
int nbAttrs; /* number of defaulted attributes on that element */
int maxAttrs; /* the size of the array */