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xmlreader.c
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/*
* xmlreader.c: implements the xmlTextReader streaming node API
*
* NOTE:
* XmlTextReader.Normalization Property won't be supported, since
* it makes the parser non compliant to the XML recommendation
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
/*
* TODOs:
* - XML Schemas validation
*/
#define IN_LIBXML
#include "libxml.h"
#ifdef LIBXML_READER_ENABLED
#include <string.h> /* for memset() only ! */
#include <stdarg.h>
#include <ctype.h>
#include <stdlib.h>
#include <libxml/xmlmemory.h>
#include <libxml/xmlIO.h>
#include <libxml/xmlreader.h>
#include <libxml/parserInternals.h>
#ifdef LIBXML_RELAXNG_ENABLED
#include <libxml/relaxng.h>
#endif
#ifdef LIBXML_SCHEMAS_ENABLED
#include <libxml/xmlschemas.h>
#endif
#include <libxml/uri.h>
#ifdef LIBXML_XINCLUDE_ENABLED
#include <libxml/xinclude.h>
#endif
#ifdef LIBXML_PATTERN_ENABLED
#include <libxml/pattern.h>
#endif
#include "private/buf.h"
#include "private/error.h"
#include "private/io.h"
#include "private/memory.h"
#include "private/parser.h"
#include "private/tree.h"
#ifdef LIBXML_XINCLUDE_ENABLED
#include "private/xinclude.h"
#endif
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
/* Keeping free objects can hide memory errors. */
#define MAX_FREE_NODES 1
#else
#define MAX_FREE_NODES 100
#endif
#ifndef va_copy
#ifdef __va_copy
#define va_copy(dest, src) __va_copy(dest, src)
#else
#define va_copy(dest, src) memcpy(&(dest), &(src), sizeof(va_list))
#endif
#endif
#define CHUNK_SIZE 512
/************************************************************************
* *
* The parser: maps the Text Reader API on top of the existing *
* parsing routines building a tree *
* *
************************************************************************/
#define XML_TEXTREADER_INPUT 1
#define XML_TEXTREADER_CTXT 2
typedef enum {
XML_TEXTREADER_NONE = -1,
XML_TEXTREADER_START= 0,
XML_TEXTREADER_ELEMENT= 1,
XML_TEXTREADER_END= 2,
XML_TEXTREADER_EMPTY= 3,
XML_TEXTREADER_BACKTRACK= 4,
XML_TEXTREADER_DONE= 5,
XML_TEXTREADER_ERROR= 6
} xmlTextReaderState;
typedef enum {
XML_TEXTREADER_NOT_VALIDATE = 0,
XML_TEXTREADER_VALIDATE_DTD = 1,
XML_TEXTREADER_VALIDATE_RNG = 2,
XML_TEXTREADER_VALIDATE_XSD = 4
} xmlTextReaderValidate;
struct _xmlTextReader {
int mode; /* the parsing mode */
xmlDocPtr doc; /* when walking an existing doc */
xmlTextReaderValidate validate;/* is there any validation */
int allocs; /* what structure were deallocated */
xmlTextReaderState state;
xmlParserCtxtPtr ctxt; /* the parser context */
xmlSAXHandlerPtr sax; /* the parser SAX callbacks */
xmlParserInputBufferPtr input; /* the input */
startElementSAXFunc startElement;/* initial SAX callbacks */
endElementSAXFunc endElement; /* idem */
startElementNsSAX2Func startElementNs;/* idem */
endElementNsSAX2Func endElementNs; /* idem */
charactersSAXFunc characters;
cdataBlockSAXFunc cdataBlock;
unsigned int base; /* base of the segment in the input */
unsigned int cur; /* current position in the input */
xmlNodePtr node; /* current node */
xmlNodePtr curnode;/* current attribute node */
int depth; /* depth of the current node */
xmlNodePtr faketext;/* fake xmlNs chld */
int preserve;/* preserve the resulting document */
xmlBufPtr buffer; /* used to return const xmlChar * */
xmlDictPtr dict; /* the context dictionary */
/* entity stack when traversing entities content */
xmlNodePtr ent; /* Current Entity Ref Node */
int entNr; /* Depth of the entities stack */
int entMax; /* Max depth of the entities stack */
xmlNodePtr *entTab; /* array of entities */
/* error handling */
xmlTextReaderErrorFunc errorFunc; /* callback function */
void *errorFuncArg; /* callback function user argument */
#ifdef LIBXML_RELAXNG_ENABLED
/* Handling of RelaxNG validation */
xmlRelaxNGPtr rngSchemas; /* The Relax NG schemas */
xmlRelaxNGValidCtxtPtr rngValidCtxt;/* The Relax NG validation context */
int rngPreserveCtxt; /* 1 if the context was provided by the user */
int rngValidErrors;/* The number of errors detected */
xmlNodePtr rngFullNode; /* the node if RNG not progressive */
#endif
#ifdef LIBXML_SCHEMAS_ENABLED
/* Handling of Schemas validation */
xmlSchemaPtr xsdSchemas; /* The Schemas schemas */
xmlSchemaValidCtxtPtr xsdValidCtxt;/* The Schemas validation context */
int xsdPreserveCtxt; /* 1 if the context was provided by the user */
int xsdValidErrors;/* The number of errors detected */
xmlSchemaSAXPlugPtr xsdPlug; /* the schemas plug in SAX pipeline */
#endif
#ifdef LIBXML_XINCLUDE_ENABLED
/* Handling of XInclude processing */
int xinclude; /* is xinclude asked for */
const xmlChar * xinclude_name; /* the xinclude name from dict */
xmlXIncludeCtxtPtr xincctxt; /* the xinclude context */
int in_xinclude; /* counts for xinclude */
#endif
#ifdef LIBXML_PATTERN_ENABLED
int patternNr; /* number of preserve patterns */
int patternMax; /* max preserve patterns */
xmlPatternPtr *patternTab; /* array of preserve patterns */
#endif
int preserves; /* level of preserves */
int parserFlags; /* the set of options set */
/* Structured error handling */
xmlStructuredErrorFunc sErrorFunc; /* callback function */
xmlResourceLoader resourceLoader;
void *resourceCtxt;
};
#define NODE_IS_EMPTY 0x1
#define NODE_IS_PRESERVED 0x2
#define NODE_IS_SPRESERVED 0x4
static int xmlTextReaderReadTree(xmlTextReaderPtr reader);
static int xmlTextReaderNextTree(xmlTextReaderPtr reader);
/**
* DICT_FREE:
* @str: a string
*
* Free a string if it is not owned by the "dict" dictionary in the
* current scope
*/
#define DICT_FREE(str) \
if ((str) && ((!dict) || \
(xmlDictOwns(dict, (const xmlChar *)(str)) == 0))) \
xmlFree((char *)(str));
static void xmlTextReaderFreeNode(xmlTextReaderPtr reader, xmlNodePtr cur);
static void xmlTextReaderFreeNodeList(xmlTextReaderPtr reader, xmlNodePtr cur);
static void
xmlTextReaderErr(xmlParserErrors code, const char *msg, ...) {
va_list ap;
int res;
va_start(ap, msg);
res = xmlVRaiseError(NULL, NULL, NULL, NULL, NULL,
XML_FROM_PARSER, code, XML_ERR_FATAL,
NULL, 0, NULL, NULL, NULL, 0, 0,
msg, ap);
va_end(ap);
if (res < 0)
xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_PARSER, NULL);
}
static void
xmlTextReaderErrMemory(xmlTextReaderPtr reader) {
if (reader->ctxt != NULL)
xmlCtxtErrMemory(reader->ctxt);
else
xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_PARSER, NULL);
reader->mode = XML_TEXTREADER_MODE_ERROR;
reader->state = XML_TEXTREADER_ERROR;
}
static xmlChar *
readerStrdup(xmlTextReaderPtr reader, const xmlChar *string) {
xmlChar *copy;
if (string == NULL)
return(NULL);
copy = xmlStrdup(string);
if (copy == NULL)
xmlTextReaderErrMemory(reader);
return(copy);
}
static const xmlChar *
constString(xmlTextReaderPtr reader, const xmlChar *string) {
const xmlChar *dictString;
if (string == NULL)
return(NULL);
dictString = xmlDictLookup(reader->dict, string, -1);
if (dictString == NULL)
xmlTextReaderErrMemory(reader);
return(dictString);
}
static const xmlChar *
constQString(xmlTextReaderPtr reader, const xmlChar *prefix,
const xmlChar *name) {
const xmlChar *dictString;
if (name == NULL)
return(NULL);
dictString = xmlDictQLookup(reader->dict, prefix, name);
if (dictString == NULL)
xmlTextReaderErrMemory(reader);
return(dictString);
}
/************************************************************************
* *
* Our own version of the freeing routines as we recycle nodes *
* *
************************************************************************/
/**
* xmlTextReaderFreeProp:
* @reader: the xmlTextReaderPtr used
* @cur: the node
*
* Free a node.
*/
static void
xmlTextReaderFreeProp(xmlTextReaderPtr reader, xmlAttrPtr cur) {
xmlDictPtr dict;
if ((reader != NULL) && (reader->ctxt != NULL))
dict = reader->ctxt->dict;
else
dict = NULL;
if (cur == NULL) return;
if ((xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
xmlDeregisterNodeDefaultValue((xmlNodePtr) cur);
if (cur->children != NULL)
xmlTextReaderFreeNodeList(reader, cur->children);
if (cur->id != NULL) {
/*
* Operating in streaming mode, attr is gonna disappear
*/
cur->id->attr = NULL;
if (cur->id->name != NULL)
DICT_FREE(cur->id->name);
cur->id->name = cur->name;
cur->name = NULL;
} else {
DICT_FREE(cur->name);
}
if ((reader != NULL) && (reader->ctxt != NULL) &&
(reader->ctxt->freeAttrsNr < MAX_FREE_NODES)) {
cur->next = reader->ctxt->freeAttrs;
reader->ctxt->freeAttrs = cur;
reader->ctxt->freeAttrsNr++;
} else {
xmlFree(cur);
}
}
/**
* xmlTextReaderFreePropList:
* @reader: the xmlTextReaderPtr used
* @cur: the first property in the list
*
* Free a property and all its siblings, all the children are freed too.
*/
static void
xmlTextReaderFreePropList(xmlTextReaderPtr reader, xmlAttrPtr cur) {
xmlAttrPtr next;
while (cur != NULL) {
next = cur->next;
xmlTextReaderFreeProp(reader, cur);
cur = next;
}
}
/**
* xmlTextReaderFreeNodeList:
* @reader: the xmlTextReaderPtr used
* @cur: the first node in the list
*
* Free a node and all its siblings, this is a recursive behaviour, all
* the children are freed too.
*/
static void
xmlTextReaderFreeNodeList(xmlTextReaderPtr reader, xmlNodePtr cur) {
xmlNodePtr next;
xmlNodePtr parent;
xmlDictPtr dict;
size_t depth = 0;
if ((reader != NULL) && (reader->ctxt != NULL))
dict = reader->ctxt->dict;
else
dict = NULL;
if (cur == NULL) return;
if (cur->type == XML_NAMESPACE_DECL) {
xmlFreeNsList((xmlNsPtr) cur);
return;
}
if ((cur->type == XML_DOCUMENT_NODE) ||
(cur->type == XML_HTML_DOCUMENT_NODE)) {
xmlFreeDoc((xmlDocPtr) cur);
return;
}
while (1) {
while ((cur->type != XML_DTD_NODE) &&
(cur->type != XML_ENTITY_REF_NODE) &&
(cur->children != NULL) &&
(cur->children->parent == cur)) {
cur = cur->children;
depth += 1;
}
next = cur->next;
parent = cur->parent;
/* unroll to speed up freeing the document */
if (cur->type != XML_DTD_NODE) {
if ((xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
xmlDeregisterNodeDefaultValue(cur);
if (((cur->type == XML_ELEMENT_NODE) ||
(cur->type == XML_XINCLUDE_START) ||
(cur->type == XML_XINCLUDE_END)) &&
(cur->properties != NULL))
xmlTextReaderFreePropList(reader, cur->properties);
if ((cur->content != (xmlChar *) &(cur->properties)) &&
(cur->type != XML_ELEMENT_NODE) &&
(cur->type != XML_XINCLUDE_START) &&
(cur->type != XML_XINCLUDE_END) &&
(cur->type != XML_ENTITY_REF_NODE)) {
DICT_FREE(cur->content);
}
if (((cur->type == XML_ELEMENT_NODE) ||
(cur->type == XML_XINCLUDE_START) ||
(cur->type == XML_XINCLUDE_END)) &&
(cur->nsDef != NULL))
xmlFreeNsList(cur->nsDef);
/*
* we don't free element names here they are interned now
*/
if ((cur->type != XML_TEXT_NODE) &&
(cur->type != XML_COMMENT_NODE))
DICT_FREE(cur->name);
if (((cur->type == XML_ELEMENT_NODE) ||
(cur->type == XML_TEXT_NODE)) &&
(reader != NULL) && (reader->ctxt != NULL) &&
(reader->ctxt->freeElemsNr < MAX_FREE_NODES)) {
cur->next = reader->ctxt->freeElems;
reader->ctxt->freeElems = cur;
reader->ctxt->freeElemsNr++;
} else {
xmlFree(cur);
}
}
if (next != NULL) {
cur = next;
} else {
if ((depth == 0) || (parent == NULL))
break;
depth -= 1;
cur = parent;
cur->children = NULL;
}
}
}
/**
* xmlTextReaderFreeNode:
* @reader: the xmlTextReaderPtr used
* @cur: the node
*
* Free a node, this is a recursive behaviour, all the children are freed too.
* This doesn't unlink the child from the list, use xmlUnlinkNode() first.
*/
static void
xmlTextReaderFreeNode(xmlTextReaderPtr reader, xmlNodePtr cur) {
xmlDictPtr dict;
if ((reader != NULL) && (reader->ctxt != NULL))
dict = reader->ctxt->dict;
else
dict = NULL;
if (cur->type == XML_DTD_NODE) {
xmlFreeDtd((xmlDtdPtr) cur);
return;
}
if (cur->type == XML_NAMESPACE_DECL) {
xmlFreeNs((xmlNsPtr) cur);
return;
}
if (cur->type == XML_ATTRIBUTE_NODE) {
xmlTextReaderFreeProp(reader, (xmlAttrPtr) cur);
return;
}
if ((cur->children != NULL) &&
(cur->type != XML_ENTITY_REF_NODE)) {
if (cur->children->parent == cur)
xmlTextReaderFreeNodeList(reader, cur->children);
cur->children = NULL;
}
if ((xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
xmlDeregisterNodeDefaultValue(cur);
if (((cur->type == XML_ELEMENT_NODE) ||
(cur->type == XML_XINCLUDE_START) ||
(cur->type == XML_XINCLUDE_END)) &&
(cur->properties != NULL))
xmlTextReaderFreePropList(reader, cur->properties);
if ((cur->content != (xmlChar *) &(cur->properties)) &&
(cur->type != XML_ELEMENT_NODE) &&
(cur->type != XML_XINCLUDE_START) &&
(cur->type != XML_XINCLUDE_END) &&
(cur->type != XML_ENTITY_REF_NODE)) {
DICT_FREE(cur->content);
}
if (((cur->type == XML_ELEMENT_NODE) ||
(cur->type == XML_XINCLUDE_START) ||
(cur->type == XML_XINCLUDE_END)) &&
(cur->nsDef != NULL))
xmlFreeNsList(cur->nsDef);
/*
* we don't free names here they are interned now
*/
if ((cur->type != XML_TEXT_NODE) &&
(cur->type != XML_COMMENT_NODE))
DICT_FREE(cur->name);
if (((cur->type == XML_ELEMENT_NODE) ||
(cur->type == XML_TEXT_NODE)) &&
(reader != NULL) && (reader->ctxt != NULL) &&
(reader->ctxt->freeElemsNr < MAX_FREE_NODES)) {
cur->next = reader->ctxt->freeElems;
reader->ctxt->freeElems = cur;
reader->ctxt->freeElemsNr++;
} else {
xmlFree(cur);
}
}
/**
* xmlTextReaderFreeDoc:
* @reader: the xmlTextReaderPtr used
* @cur: pointer to the document
*
* Free up all the structures used by a document, tree included.
*/
static void
xmlTextReaderFreeDoc(xmlTextReaderPtr reader, xmlDocPtr cur) {
xmlDtdPtr extSubset, intSubset;
if (cur == NULL) return;
if ((xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
xmlDeregisterNodeDefaultValue((xmlNodePtr) cur);
/*
* Do this before freeing the children list to avoid ID lookups
*/
if (cur->ids != NULL) xmlFreeIDTable((xmlIDTablePtr) cur->ids);
cur->ids = NULL;
if (cur->refs != NULL) xmlFreeRefTable((xmlRefTablePtr) cur->refs);
cur->refs = NULL;
extSubset = cur->extSubset;
intSubset = cur->intSubset;
if (intSubset == extSubset)
extSubset = NULL;
if (extSubset != NULL) {
xmlUnlinkNode((xmlNodePtr) cur->extSubset);
cur->extSubset = NULL;
xmlFreeDtd(extSubset);
}
if (intSubset != NULL) {
xmlUnlinkNode((xmlNodePtr) cur->intSubset);
cur->intSubset = NULL;
xmlFreeDtd(intSubset);
}
if (cur->children != NULL) xmlTextReaderFreeNodeList(reader, cur->children);
if (cur->version != NULL) xmlFree((char *) cur->version);
if (cur->name != NULL) xmlFree((char *) cur->name);
if (cur->encoding != NULL) xmlFree((char *) cur->encoding);
if (cur->oldNs != NULL) xmlFreeNsList(cur->oldNs);
if (cur->URL != NULL) xmlFree((char *) cur->URL);
if (cur->dict != NULL) xmlDictFree(cur->dict);
xmlFree(cur);
}
/************************************************************************
* *
* The reader core parser *
* *
************************************************************************/
static void
xmlTextReaderStructuredRelay(void *userData, const xmlError *error)
{
xmlTextReaderPtr reader = (xmlTextReaderPtr) userData;
if (reader->sErrorFunc != NULL) {
reader->sErrorFunc(reader->errorFuncArg, error);
} else if (reader->errorFunc != NULL) {
xmlParserSeverities severity;
if ((error->domain == XML_FROM_VALID) ||
(error->domain == XML_FROM_DTD)) {
if (error->level == XML_ERR_WARNING)
severity = XML_PARSER_SEVERITY_VALIDITY_WARNING;
else
severity = XML_PARSER_SEVERITY_VALIDITY_ERROR;
} else {
if (error->level == XML_ERR_WARNING)
severity = XML_PARSER_SEVERITY_WARNING;
else
severity = XML_PARSER_SEVERITY_ERROR;
}
reader->errorFunc(reader->errorFuncArg, error->message, severity,
reader->ctxt);
}
}
/**
* xmlTextReaderEntPush:
* @reader: the xmlTextReaderPtr used
* @value: the entity reference node
*
* Pushes a new entity reference node on top of the entities stack
*
* Returns -1 in case of error, the index in the stack otherwise
*/
static int
xmlTextReaderEntPush(xmlTextReaderPtr reader, xmlNodePtr value)
{
if (reader->entNr >= reader->entMax) {
xmlNodePtr *tmp;
int newSize;
newSize = xmlGrowCapacity(reader->entMax, sizeof(tmp[0]),
10, XML_MAX_ITEMS);
if (newSize < 0) {
xmlTextReaderErrMemory(reader);
return (-1);
}
tmp = xmlRealloc(reader->entTab, newSize * sizeof(tmp[0]));
if (tmp == NULL) {
xmlTextReaderErrMemory(reader);
return (-1);
}
reader->entTab = tmp;
reader->entMax = newSize;
}
reader->entTab[reader->entNr] = value;
reader->ent = value;
return (reader->entNr++);
}
/**
* xmlTextReaderEntPop:
* @reader: the xmlTextReaderPtr used
*
* Pops the top element entity from the entities stack
*
* Returns the entity just removed
*/
static xmlNodePtr
xmlTextReaderEntPop(xmlTextReaderPtr reader)
{
xmlNodePtr ret;
if (reader->entNr <= 0)
return (NULL);
reader->entNr--;
if (reader->entNr > 0)
reader->ent = reader->entTab[reader->entNr - 1];
else
reader->ent = NULL;
ret = reader->entTab[reader->entNr];
reader->entTab[reader->entNr] = NULL;
return (ret);
}
/**
* xmlTextReaderStartElement:
* @ctx: the user data (XML parser context)
* @fullname: The element name, including namespace prefix
* @atts: An array of name/value attributes pairs, NULL terminated
*
* called when an opening tag has been processed.
*/
static void
xmlTextReaderStartElement(void *ctx, const xmlChar *fullname,
const xmlChar **atts) {
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
xmlTextReaderPtr reader = ctxt->_private;
if ((reader != NULL) && (reader->startElement != NULL)) {
reader->startElement(ctx, fullname, atts);
if ((ctxt->node != NULL) && (ctxt->input != NULL) &&
(ctxt->input->cur != NULL) && (ctxt->input->cur[0] == '/') &&
(ctxt->input->cur[1] == '>'))
ctxt->node->extra = NODE_IS_EMPTY;
}
if (reader != NULL)
reader->state = XML_TEXTREADER_ELEMENT;
}
/**
* xmlTextReaderEndElement:
* @ctx: the user data (XML parser context)
* @fullname: The element name, including namespace prefix
*
* called when an ending tag has been processed.
*/
static void
xmlTextReaderEndElement(void *ctx, const xmlChar *fullname) {
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
xmlTextReaderPtr reader = ctxt->_private;
if ((reader != NULL) && (reader->endElement != NULL)) {
reader->endElement(ctx, fullname);
}
}
/**
* xmlTextReaderStartElementNs:
* @ctx: the user data (XML parser context)
* @localname: the local name of the element
* @prefix: the element namespace prefix if available
* @URI: the element namespace name if available
* @nb_namespaces: number of namespace definitions on that node
* @namespaces: pointer to the array of prefix/URI pairs namespace definitions
* @nb_attributes: the number of attributes on that node
* nb_defaulted: the number of defaulted attributes.
* @attributes: pointer to the array of (localname/prefix/URI/value/end)
* attribute values.
*
* called when an opening tag has been processed.
*/
static void
xmlTextReaderStartElementNs(void *ctx,
const xmlChar *localname,
const xmlChar *prefix,
const xmlChar *URI,
int nb_namespaces,
const xmlChar **namespaces,
int nb_attributes,
int nb_defaulted,
const xmlChar **attributes)
{
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
xmlTextReaderPtr reader = ctxt->_private;
if ((reader != NULL) && (reader->startElementNs != NULL)) {
reader->startElementNs(ctx, localname, prefix, URI, nb_namespaces,
namespaces, nb_attributes, nb_defaulted,
attributes);
if ((ctxt->node != NULL) && (ctxt->input != NULL) &&
(ctxt->input->cur != NULL) && (ctxt->input->cur[0] == '/') &&
(ctxt->input->cur[1] == '>'))
ctxt->node->extra = NODE_IS_EMPTY;
}
if (reader != NULL)
reader->state = XML_TEXTREADER_ELEMENT;
}
/**
* xmlTextReaderEndElementNs:
* @ctx: the user data (XML parser context)
* @localname: the local name of the element
* @prefix: the element namespace prefix if available
* @URI: the element namespace name if available
*
* called when an ending tag has been processed.
*/
static void
xmlTextReaderEndElementNs(void *ctx,
const xmlChar * localname,
const xmlChar * prefix,
const xmlChar * URI)
{
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
xmlTextReaderPtr reader = ctxt->_private;
if ((reader != NULL) && (reader->endElementNs != NULL)) {
reader->endElementNs(ctx, localname, prefix, URI);
}
}
/**
* xmlTextReaderCharacters:
* @ctx: the user data (XML parser context)
* @ch: a xmlChar string
* @len: the number of xmlChar
*
* receiving some chars from the parser.
*/
static void
xmlTextReaderCharacters(void *ctx, const xmlChar *ch, int len)
{
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
xmlTextReaderPtr reader = ctxt->_private;
if ((reader != NULL) && (reader->characters != NULL)) {
reader->characters(ctx, ch, len);
}
}
/**
* xmlTextReaderCDataBlock:
* @ctx: the user data (XML parser context)
* @value: The pcdata content
* @len: the block length
*
* called when a pcdata block has been parsed
*/
static void
xmlTextReaderCDataBlock(void *ctx, const xmlChar *ch, int len)
{
xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
xmlTextReaderPtr reader = ctxt->_private;
if ((reader != NULL) && (reader->cdataBlock != NULL)) {
reader->cdataBlock(ctx, ch, len);
}
}
/**
* xmlTextReaderPushData:
* @reader: the xmlTextReaderPtr used
*
* Push data down the progressive parser until a significant callback
* got raised.
*
* Returns -1 in case of failure, 0 otherwise
*/
static int
xmlTextReaderPushData(xmlTextReaderPtr reader) {
xmlBufPtr inbuf;
int val, s;
xmlTextReaderState oldstate;
if ((reader->input == NULL) || (reader->input->buffer == NULL))
return(-1);
oldstate = reader->state;
reader->state = XML_TEXTREADER_NONE;
inbuf = reader->input->buffer;
while (reader->state == XML_TEXTREADER_NONE) {
if (xmlBufUse(inbuf) < reader->cur + CHUNK_SIZE) {
/*
* Refill the buffer unless we are at the end of the stream
*/
if (reader->mode != XML_TEXTREADER_MODE_EOF) {
val = xmlParserInputBufferRead(reader->input, 4096);
if (val == 0) {
if (xmlBufUse(inbuf) == reader->cur) {
reader->mode = XML_TEXTREADER_MODE_EOF;
break;
}
} else if (val < 0) {
xmlCtxtErrIO(reader->ctxt, reader->input->error, NULL);
reader->mode = XML_TEXTREADER_MODE_ERROR;
reader->state = XML_TEXTREADER_ERROR;
return(-1);
}
} else
break;
}
/*
* parse by block of CHUNK_SIZE bytes, various tests show that
* it's the best tradeoff at least on a 1.2GH Duron
*/
if (xmlBufUse(inbuf) >= reader->cur + CHUNK_SIZE) {
val = xmlParseChunk(reader->ctxt,
(const char *) xmlBufContent(inbuf) + reader->cur,
CHUNK_SIZE, 0);
reader->cur += CHUNK_SIZE;
if (val != 0)
reader->ctxt->wellFormed = 0;
if (reader->ctxt->wellFormed == 0)
break;
} else {
s = xmlBufUse(inbuf) - reader->cur;
val = xmlParseChunk(reader->ctxt,
(const char *) xmlBufContent(inbuf) + reader->cur,
s, 0);
reader->cur += s;
if (val != 0)
reader->ctxt->wellFormed = 0;
break;
}
}
reader->state = oldstate;
/*
* Discard the consumed input when needed and possible
*/
if (reader->mode == XML_TEXTREADER_MODE_INTERACTIVE) {
if (reader->cur > 80 /* LINE_LEN */) {
val = xmlBufShrink(inbuf, reader->cur - 80);
if (val >= 0) {
reader->cur -= val;
}
}
}
/*
* At the end of the stream signal that the work is done to the Push
* parser.
*/
else if (reader->mode == XML_TEXTREADER_MODE_EOF) {
if (reader->state != XML_TEXTREADER_DONE) {
s = xmlBufUse(inbuf) - reader->cur;
val = xmlParseChunk(reader->ctxt,
(const char *) xmlBufContent(inbuf) + reader->cur,
s, 1);
reader->cur = xmlBufUse(inbuf);
reader->state = XML_TEXTREADER_DONE;
if (val != 0) {
if (reader->ctxt->wellFormed)
reader->ctxt->wellFormed = 0;
else
return(-1);
}
}
}
if (reader->ctxt->wellFormed == 0) {
reader->mode = XML_TEXTREADER_MODE_EOF;
return(-1);
}
return(0);
}
#ifdef LIBXML_REGEXP_ENABLED
/**
* xmlTextReaderValidatePush:
* @reader: the xmlTextReaderPtr used
*
* Push the current node for validation
*/
static int
xmlTextReaderValidatePush(xmlTextReaderPtr reader) {
xmlNodePtr node = reader->node;
#ifdef LIBXML_VALID_ENABLED
if ((reader->validate == XML_TEXTREADER_VALIDATE_DTD) &&
(reader->ctxt != NULL) && (reader->ctxt->validate == 1)) {
if ((node->ns == NULL) || (node->ns->prefix == NULL)) {
reader->ctxt->valid &= xmlValidatePushElement(&reader->ctxt->vctxt,
reader->ctxt->myDoc, node, node->name);
} else {
xmlChar buf[50];
xmlChar *qname;
qname = xmlBuildQName(node->name, node->ns->prefix, buf, 50);
if (qname == NULL) {
xmlTextReaderErrMemory(reader);
return(-1);
}
reader->ctxt->valid &= xmlValidatePushElement(&reader->ctxt->vctxt,
reader->ctxt->myDoc, node, qname);
if (qname != buf)
xmlFree(qname);
}
/*if (reader->ctxt->errNo == XML_ERR_NO_MEMORY) {
reader->mode = XML_TEXTREADER_MODE_ERROR;
reader->state = XML_TEXTREADER_ERROR;
return(-1);
}*/
}
#endif /* LIBXML_VALID_ENABLED */
#ifdef LIBXML_RELAXNG_ENABLED
if ((reader->validate == XML_TEXTREADER_VALIDATE_RNG) &&
(reader->rngValidCtxt != NULL)) {
int ret;
if (reader->rngFullNode != NULL) return(0);
ret = xmlRelaxNGValidatePushElement(reader->rngValidCtxt,
reader->ctxt->myDoc,
node);
if (ret == 0) {
/*
* this element requires a full tree
*/
node = xmlTextReaderExpand(reader);
if (node == NULL) {
ret = -1;
} else {
ret = xmlRelaxNGValidateFullElement(reader->rngValidCtxt,
reader->ctxt->myDoc,
node);
reader->rngFullNode = node;
}
}
if (ret != 1)
reader->rngValidErrors++;
}
#endif
return(0);
}
/**
* xmlTextReaderValidateCData:
* @reader: the xmlTextReaderPtr used
* @data: pointer to the CData
* @len: length of the CData block in bytes.
*
* Push some CData for validation
*/
static void
xmlTextReaderValidateCData(xmlTextReaderPtr reader,
const xmlChar *data, int len) {
#ifdef LIBXML_VALID_ENABLED
if ((reader->validate == XML_TEXTREADER_VALIDATE_DTD) &&
(reader->ctxt != NULL) && (reader->ctxt->validate == 1)) {
reader->ctxt->valid &= xmlValidatePushCData(&reader->ctxt->vctxt,
data, len);
}
#endif /* LIBXML_VALID_ENABLED */
#ifdef LIBXML_RELAXNG_ENABLED
if ((reader->validate == XML_TEXTREADER_VALIDATE_RNG) &&
(reader->rngValidCtxt != NULL)) {
int ret;
if (reader->rngFullNode != NULL) return;
ret = xmlRelaxNGValidatePushCData(reader->rngValidCtxt, data, len);
if (ret != 1)
reader->rngValidErrors++;
}
#endif
}