niceSOFT/libxml2: XML parser and toolkit

xmlsave.c
2 680 строк76 KB
Nick Wellnhofer
doc: Prefix autolinks with '#'
28 май 2025, 17:01
28 май 2025, 17:017bd8d1d
/*
 * xmlsave.c: Implementation of the document serializer
 *
 * See Copyright for the status of this software.
 *
 * Author: Daniel Veillard
 */

#define IN_LIBXML
#include "libxml.h"

#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/parserInternals.h>
#include <libxml/tree.h>
#include <libxml/xmlsave.h>

#define MAX_INDENT 60

#include <libxml/HTMLtree.h>

#include "private/buf.h"
#include "private/enc.h"
#include "private/error.h"
#include "private/html.h"
#include "private/io.h"
#include "private/save.h"

#ifdef LIBXML_OUTPUT_ENABLED

#define XHTML_NS_NAME BAD_CAST "http://www.w3.org/1999/xhtml"

struct _xmlSaveCtxt {
    const xmlChar *encoding;
    xmlCharEncodingHandlerPtr handler;
    xmlOutputBufferPtr buf;
    int options;
    int level;
    int format;
    char indent[MAX_INDENT + 1];	/* array for indenting output */
    int indent_nr;
    int indent_size;
    xmlCharEncodingOutputFunc escape;	/* used for element content */
};

/************************************************************************
 *									*
 *			Output error handlers				*
 *									*
 ************************************************************************/
/**
 * Handle an out of memory condition
 *
 * @param out  an output buffer
 */
static void
xmlSaveErrMemory(xmlOutputBufferPtr out)
{
    if (out != NULL)
        out->error = XML_ERR_NO_MEMORY;
    xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_OUTPUT, NULL);
}

/**
 * Handle an out of memory condition
 *
 * @param out  an output buffer
 * @param code  the error number
 * @param node  the location of the error.
 * @param extra  extra information
 */
static void
xmlSaveErr(xmlOutputBufferPtr out, int code, xmlNodePtr node,
           const char *extra)
{
    const char *msg = NULL;
    int res;

    /* Don't overwrite catastrophic errors */
    if ((out != NULL) &&
        (out->error != XML_ERR_OK) &&
        (xmlIsCatastrophicError(XML_ERR_FATAL, out->error)))
        return;

    if (code == XML_ERR_NO_MEMORY) {
        xmlSaveErrMemory(out);
        return;
    }

    if (out != NULL)
        out->error = code;

    if (code == XML_ERR_UNSUPPORTED_ENCODING) {
        msg = "Unsupported encoding: %s";
    } else {
        msg = xmlErrString(code);
        extra = NULL;
    }

    res = xmlRaiseError(NULL, NULL, NULL, NULL, node,
                        XML_FROM_OUTPUT, code, XML_ERR_ERROR, NULL, 0,
                        extra, NULL, NULL, 0, 0,
                        msg, extra);
    if (res < 0)
        xmlSaveErrMemory(out);
}

/************************************************************************
 *									*
 *			Allocation and deallocation			*
 *									*
 ************************************************************************/

/**
 * Sets the indent string.
 *
 * @since 2.14.0
 *
 * @param ctxt  save context
 * @param indent  indent string
 * @returns 0 on success, -1 if the string is NULL, empty or too long.
 */
int
xmlSaveSetIndentString(xmlSaveCtxt *ctxt, const char *indent) {
    size_t len;
    int i;

    if ((ctxt == NULL) || (indent == NULL))
        return(-1);

    len = strlen(indent);
    if ((len <= 0) || (len > MAX_INDENT))
        return(-1);

    ctxt->indent_size = len;
    ctxt->indent_nr = MAX_INDENT / ctxt->indent_size;
    for (i = 0; i < ctxt->indent_nr; i++)
        memcpy(&ctxt->indent[i * ctxt->indent_size], indent, len);

    return(0);
}

/**
 * Initialize a saving context
 *
 * @param ctxt  the saving context
 * @param options  save options
 */
static void
xmlSaveCtxtInit(xmlSaveCtxtPtr ctxt, int options)
{
    if (ctxt == NULL) return;

    xmlSaveSetIndentString(ctxt, xmlTreeIndentString);

    if (options & XML_SAVE_FORMAT)
        ctxt->format = 1;
    else if (options & XML_SAVE_WSNONSIG)
        ctxt->format = 2;

    if (((options & XML_SAVE_EMPTY) == 0) &&
        (xmlSaveNoEmptyTags))
	options |= XML_SAVE_NO_EMPTY;

    ctxt->options = options;
}

/**
 * Free a saving context, destroying the output in any remaining buffer
 */
static void
xmlFreeSaveCtxt(xmlSaveCtxtPtr ctxt)
{
    if (ctxt == NULL) return;
    if (ctxt->encoding != NULL)
        xmlFree((char *) ctxt->encoding);
    if (ctxt->buf != NULL)
        xmlOutputBufferClose(ctxt->buf);
    xmlFree(ctxt);
}

/**
 * Create a new saving context
 *
 * @returns the new structure or NULL in case of error
 */
static xmlSaveCtxtPtr
xmlNewSaveCtxt(const char *encoding, int options)
{
    xmlSaveCtxtPtr ret;

    ret = (xmlSaveCtxtPtr) xmlMalloc(sizeof(xmlSaveCtxt));
    if (ret == NULL) {
	xmlSaveErrMemory(NULL);
	return ( NULL );
    }
    memset(ret, 0, sizeof(xmlSaveCtxt));

    if (encoding != NULL) {
        xmlParserErrors res;

        res = xmlOpenCharEncodingHandler(encoding, /* output */ 1,
                                         &ret->handler);
	if (res != XML_ERR_OK) {
	    xmlSaveErr(NULL, res, NULL, encoding);
            xmlFreeSaveCtxt(ret);
	    return(NULL);
	}
        ret->encoding = xmlStrdup((const xmlChar *)encoding);
    }

    xmlSaveCtxtInit(ret, options);

    return(ret);
}

/************************************************************************
 *									*
 *		Dumping XML tree content to a simple buffer		*
 *									*
 ************************************************************************/

static void
xmlSaveWriteText(xmlSaveCtxt *ctxt, const xmlChar *text, unsigned flags) {
    if (ctxt->encoding == NULL)
        flags |= XML_ESCAPE_NON_ASCII;

    xmlSerializeText(ctxt->buf, text, SIZE_MAX, flags);
}

/**
 * Serialize the attribute in the buffer
 *
 * @param ctxt  save context
 * @param attr  the attribute pointer
 */
static void
xmlSaveWriteAttrContent(xmlSaveCtxt *ctxt, xmlAttrPtr attr)
{
    xmlNodePtr children;
    xmlOutputBufferPtr buf = ctxt->buf;

    children = attr->children;
    while (children != NULL) {
        switch (children->type) {
            case XML_TEXT_NODE:
	        xmlSaveWriteText(ctxt, children->content, XML_ESCAPE_ATTR);
		break;
            case XML_ENTITY_REF_NODE:
                xmlOutputBufferWrite(buf, 1, "&");
                xmlOutputBufferWriteString(buf, (const char *) children->name);
                xmlOutputBufferWrite(buf, 1, ";");
                break;
            default:
                /* should not happen unless we have a badly built tree */
                break;
        }
        children = children->next;
    }
}

/**
 * This will dump the content the notation declaration as an XML DTD definition
 *
 * @param buf  the XML buffer output
 * @param nota  A notation declaration
 */
static void
xmlBufDumpNotationDecl(xmlOutputBufferPtr buf, xmlNotationPtr nota) {
    xmlOutputBufferWrite(buf, 11, "<!NOTATION ");
    xmlOutputBufferWriteString(buf, (const char *) nota->name);

    if (nota->PublicID != NULL) {
	xmlOutputBufferWrite(buf, 8, " PUBLIC ");
	xmlOutputBufferWriteQuotedString(buf, nota->PublicID);
	if (nota->SystemID != NULL) {
	    xmlOutputBufferWrite(buf, 1, " ");
	    xmlOutputBufferWriteQuotedString(buf, nota->SystemID);
	}
    } else {
	xmlOutputBufferWrite(buf, 8, " SYSTEM ");
	xmlOutputBufferWriteQuotedString(buf, nota->SystemID);
    }

    xmlOutputBufferWrite(buf, 3, " >\n");
}

/**
 * This is called with the hash scan function, and just reverses args
 *
 * @param nota  A notation declaration
 * @param buf  the XML buffer output
 * @param name  unused
 */
static void
xmlBufDumpNotationDeclScan(void *nota, void *buf,
                           const xmlChar *name ATTRIBUTE_UNUSED) {
    xmlBufDumpNotationDecl((xmlOutputBufferPtr) buf, (xmlNotationPtr) nota);
}

/**
 * This will dump the content of the notation table as an XML DTD definition
 *
 * @param buf  an xmlBuf output
 * @param table  A notation table
 */
static void
xmlBufDumpNotationTable(xmlOutputBufferPtr buf, xmlNotationTablePtr table) {
    xmlHashScan(table, xmlBufDumpNotationDeclScan, buf);
}

/**
 * Dump the occurrence operator of an element.
 *
 * @param buf  output buffer
 * @param cur  element table
 */
static void
xmlBufDumpElementOccur(xmlOutputBufferPtr buf, xmlElementContentPtr cur) {
    switch (cur->ocur) {
        case XML_ELEMENT_CONTENT_ONCE:
            break;
        case XML_ELEMENT_CONTENT_OPT:
            xmlOutputBufferWrite(buf, 1, "?");
            break;
        case XML_ELEMENT_CONTENT_MULT:
            xmlOutputBufferWrite(buf, 1, "*");
            break;
        case XML_ELEMENT_CONTENT_PLUS:
            xmlOutputBufferWrite(buf, 1, "+");
            break;
    }
}

/**
 * This will dump the content of the element table as an XML DTD definition
 *
 * @param buf  output buffer
 * @param content  element table
 */
static void
xmlBufDumpElementContent(xmlOutputBufferPtr buf,
                         xmlElementContentPtr content) {
    xmlElementContentPtr cur;

    if (content == NULL) return;

    xmlOutputBufferWrite(buf, 1, "(");
    cur = content;

    do {
        if (cur == NULL) return;

        switch (cur->type) {
            case XML_ELEMENT_CONTENT_PCDATA:
                xmlOutputBufferWrite(buf, 7, "#PCDATA");
                break;
            case XML_ELEMENT_CONTENT_ELEMENT:
                if (cur->prefix != NULL) {
                    xmlOutputBufferWriteString(buf,
                            (const char *) cur->prefix);
                    xmlOutputBufferWrite(buf, 1, ":");
                }
                xmlOutputBufferWriteString(buf, (const char *) cur->name);
                break;
            case XML_ELEMENT_CONTENT_SEQ:
            case XML_ELEMENT_CONTENT_OR:
                if ((cur != content) &&
                    (cur->parent != NULL) &&
                    ((cur->type != cur->parent->type) ||
                     (cur->ocur != XML_ELEMENT_CONTENT_ONCE)))
                    xmlOutputBufferWrite(buf, 1, "(");
                cur = cur->c1;
                continue;
        }

        while (cur != content) {
            xmlElementContentPtr parent = cur->parent;

            if (parent == NULL) return;

            if (((cur->type == XML_ELEMENT_CONTENT_OR) ||
                 (cur->type == XML_ELEMENT_CONTENT_SEQ)) &&
                ((cur->type != parent->type) ||
                 (cur->ocur != XML_ELEMENT_CONTENT_ONCE)))
                xmlOutputBufferWrite(buf, 1, ")");
            xmlBufDumpElementOccur(buf, cur);

            if (cur == parent->c1) {
                if (parent->type == XML_ELEMENT_CONTENT_SEQ)
                    xmlOutputBufferWrite(buf, 3, " , ");
                else if (parent->type == XML_ELEMENT_CONTENT_OR)
                    xmlOutputBufferWrite(buf, 3, " | ");

                cur = parent->c2;
                break;
            }

            cur = parent;
        }
    } while (cur != content);

    xmlOutputBufferWrite(buf, 1, ")");
    xmlBufDumpElementOccur(buf, content);
}

/**
 * This will dump the content of the element declaration as an XML
 * DTD definition
 *
 * @param buf  an xmlBuf output
 * @param elem  An element table
 */
static void
xmlBufDumpElementDecl(xmlOutputBufferPtr buf, xmlElementPtr elem) {
    xmlOutputBufferWrite(buf, 10, "<!ELEMENT ");
    if (elem->prefix != NULL) {
        xmlOutputBufferWriteString(buf, (const char *) elem->prefix);
        xmlOutputBufferWrite(buf, 1, ":");
    }
    xmlOutputBufferWriteString(buf, (const char *) elem->name);
    xmlOutputBufferWrite(buf, 1, " ");

    switch (elem->etype) {
	case XML_ELEMENT_TYPE_EMPTY:
	    xmlOutputBufferWrite(buf, 5, "EMPTY");
	    break;
	case XML_ELEMENT_TYPE_ANY:
	    xmlOutputBufferWrite(buf, 3, "ANY");
	    break;
	case XML_ELEMENT_TYPE_MIXED:
	case XML_ELEMENT_TYPE_ELEMENT:
	    xmlBufDumpElementContent(buf, elem->content);
	    break;
        default:
            /* assert(0); */
            break;
    }

    xmlOutputBufferWrite(buf, 2, ">\n");
}

/**
 * This will dump the content of the enumeration
 *
 * @param buf  output buffer
 * @param cur  an enumeration
 */
static void
xmlBufDumpEnumeration(xmlOutputBufferPtr buf, xmlEnumerationPtr cur) {
    while (cur != NULL) {
        xmlOutputBufferWriteString(buf, (const char *) cur->name);
        if (cur->next != NULL)
            xmlOutputBufferWrite(buf, 3, " | ");

        cur = cur->next;
    }

    xmlOutputBufferWrite(buf, 1, ")");
}
/**
 * This will dump the content of the attribute declaration as an XML
 * DTD definition
 *
 * @param ctxt  save context
 * @param attr  an attribute declaration
 */
static void
xmlSaveWriteAttributeDecl(xmlSaveCtxtPtr ctxt, xmlAttributePtr attr) {
    xmlOutputBufferPtr buf = ctxt->buf;

    xmlOutputBufferWrite(buf, 10, "<!ATTLIST ");
    xmlOutputBufferWriteString(buf, (const char *) attr->elem);
    xmlOutputBufferWrite(buf, 1, " ");
    if (attr->prefix != NULL) {
	xmlOutputBufferWriteString(buf, (const char *) attr->prefix);
	xmlOutputBufferWrite(buf, 1, ":");
    }
    xmlOutputBufferWriteString(buf, (const char *) attr->name);

    switch (attr->atype) {
	case XML_ATTRIBUTE_CDATA:
	    xmlOutputBufferWrite(buf, 6, " CDATA");
	    break;
	case XML_ATTRIBUTE_ID:
	    xmlOutputBufferWrite(buf, 3, " ID");
	    break;
	case XML_ATTRIBUTE_IDREF:
	    xmlOutputBufferWrite(buf, 6, " IDREF");
	    break;
	case XML_ATTRIBUTE_IDREFS:
	    xmlOutputBufferWrite(buf, 7, " IDREFS");
	    break;
	case XML_ATTRIBUTE_ENTITY:
	    xmlOutputBufferWrite(buf, 7, " ENTITY");
	    break;
	case XML_ATTRIBUTE_ENTITIES:
	    xmlOutputBufferWrite(buf, 9, " ENTITIES");
	    break;
	case XML_ATTRIBUTE_NMTOKEN:
	    xmlOutputBufferWrite(buf, 8, " NMTOKEN");
	    break;
	case XML_ATTRIBUTE_NMTOKENS:
	    xmlOutputBufferWrite(buf, 9, " NMTOKENS");
	    break;
	case XML_ATTRIBUTE_ENUMERATION:
	    xmlOutputBufferWrite(buf, 2, " (");
	    xmlBufDumpEnumeration(buf, attr->tree);
	    break;
	case XML_ATTRIBUTE_NOTATION:
	    xmlOutputBufferWrite(buf, 11, " NOTATION (");
	    xmlBufDumpEnumeration(buf, attr->tree);
	    break;
	default:
            /* assert(0); */
            break;
    }

    switch (attr->def) {
	case XML_ATTRIBUTE_NONE:
	    break;
	case XML_ATTRIBUTE_REQUIRED:
	    xmlOutputBufferWrite(buf, 10, " #REQUIRED");
	    break;
	case XML_ATTRIBUTE_IMPLIED:
	    xmlOutputBufferWrite(buf, 9, " #IMPLIED");
	    break;
	case XML_ATTRIBUTE_FIXED:
	    xmlOutputBufferWrite(buf, 7, " #FIXED");
	    break;
	default:
            /* assert(0); */
            break;
    }

    if (attr->defaultValue != NULL) {
        xmlOutputBufferWrite(buf, 2, " \"");
        xmlSaveWriteText(ctxt, attr->defaultValue, XML_ESCAPE_ATTR);
        xmlOutputBufferWrite(buf, 1, "\"");
    }

    xmlOutputBufferWrite(buf, 2, ">\n");
}

/**
 * This will dump the quoted string value, taking care of the special
 * treatment required by %
 *
 * @param buf  output buffer
 * @param content  entity content.
 */
static void
xmlBufDumpEntityContent(xmlOutputBufferPtr buf, const xmlChar *content) {
    const char * base, *cur;

    if (content == NULL)
        return;

    xmlOutputBufferWrite(buf, 1, "\"");
    base = cur = (const char *) content;
    while (*cur != 0) {
        if (*cur == '"') {
            if (base != cur)
                xmlOutputBufferWrite(buf, cur - base, base);
            xmlOutputBufferWrite(buf, 6, "&quot;");
            cur++;
            base = cur;
        } else if (*cur == '%') {
            if (base != cur)
                xmlOutputBufferWrite(buf, cur - base, base);
            xmlOutputBufferWrite(buf, 6, "&#x25;");
            cur++;
            base = cur;
        } else {
            cur++;
        }
    }
    if (base != cur)
        xmlOutputBufferWrite(buf, cur - base, base);
    xmlOutputBufferWrite(buf, 1, "\"");
}

/**
 * This will dump the content of the entity table as an XML DTD definition
 *
 * @param buf  an xmlBuf output
 * @param ent  An entity table
 */
static void
xmlBufDumpEntityDecl(xmlOutputBufferPtr buf, xmlEntityPtr ent) {
    if ((ent->etype == XML_INTERNAL_PARAMETER_ENTITY) ||
        (ent->etype == XML_EXTERNAL_PARAMETER_ENTITY))
        xmlOutputBufferWrite(buf, 11, "<!ENTITY % ");
    else
        xmlOutputBufferWrite(buf, 9, "<!ENTITY ");
    xmlOutputBufferWriteString(buf, (const char *) ent->name);
    xmlOutputBufferWrite(buf, 1, " ");

    if ((ent->etype == XML_EXTERNAL_GENERAL_PARSED_ENTITY) ||
        (ent->etype == XML_EXTERNAL_GENERAL_UNPARSED_ENTITY) ||
        (ent->etype == XML_EXTERNAL_PARAMETER_ENTITY)) {
        if (ent->ExternalID != NULL) {
             xmlOutputBufferWrite(buf, 7, "PUBLIC ");
             xmlOutputBufferWriteQuotedString(buf, ent->ExternalID);
             xmlOutputBufferWrite(buf, 1, " ");
        } else {
             xmlOutputBufferWrite(buf, 7, "SYSTEM ");
        }
        xmlOutputBufferWriteQuotedString(buf, ent->SystemID);
    }

    if (ent->etype == XML_EXTERNAL_GENERAL_UNPARSED_ENTITY) {
        if (ent->content != NULL) { /* Should be true ! */
            xmlOutputBufferWrite(buf, 7, " NDATA ");
            if (ent->orig != NULL)
                xmlOutputBufferWriteString(buf, (const char *) ent->orig);
            else
                xmlOutputBufferWriteString(buf, (const char *) ent->content);
        }
    }

    if ((ent->etype == XML_INTERNAL_GENERAL_ENTITY) ||
        (ent->etype == XML_INTERNAL_PARAMETER_ENTITY)) {
        /*
         * We could save the original quote character and avoid
         * calling xmlOutputBufferWriteQuotedString here.
         */
        if (ent->orig != NULL)
            xmlOutputBufferWriteQuotedString(buf, ent->orig);
        else
            xmlBufDumpEntityContent(buf, ent->content);
    }

    xmlOutputBufferWrite(buf, 2, ">\n");
}

/************************************************************************
 *									*
 *		Dumping XML tree content to an I/O output buffer	*
 *									*
 ************************************************************************/

static int
xmlSaveSwitchEncoding(xmlSaveCtxtPtr ctxt, const char *encoding) {
    xmlOutputBufferPtr buf = ctxt->buf;
    xmlCharEncodingHandler *handler;
    xmlParserErrors res;

    /* shouldn't happen */
    if ((buf->encoder != NULL) || (buf->conv != NULL))
        return(-1);

    res = xmlOpenCharEncodingHandler(encoding, /* output */ 1, &handler);
    if (res != XML_ERR_OK) {
        xmlSaveErr(buf, res, NULL, encoding);
        return(-1);
    }

    if (handler != NULL) {
        xmlBufPtr newbuf;

        newbuf = xmlBufCreate(4000 /* MINLEN */);
        if (newbuf == NULL) {
            xmlCharEncCloseFunc(handler);
            xmlSaveErrMemory(buf);
            return(-1);
        }

        buf->conv = buf->buffer;
        buf->buffer = newbuf;
        buf->encoder = handler;
    }

    ctxt->encoding = (const xmlChar *) encoding;

    /*
     * initialize the state, e.g. if outputting a BOM
     */
    xmlCharEncOutput(buf, 1);

    return(0);
}

static int
xmlSaveClearEncoding(xmlSaveCtxtPtr ctxt) {
    xmlOutputBufferPtr buf = ctxt->buf;

    xmlOutputBufferFlush(buf);

    if (buf->encoder != NULL) {
        xmlCharEncCloseFunc(buf->encoder);
        buf->encoder = NULL;
        xmlBufFree(buf->buffer);
        buf->buffer = buf->conv;
        buf->conv = NULL;
    }

    ctxt->encoding = NULL;

    return(0);
}

#ifdef LIBXML_HTML_ENABLED
static void
xhtmlNodeDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur);
#endif
static void
xmlNodeDumpOutputInternal(xmlSaveCtxtPtr ctxt, xmlNodePtr cur);
static int
xmlSaveDocInternal(xmlSaveCtxtPtr ctxt, xmlDocPtr cur,
                   const xmlChar *encoding);

static void
xmlSaveWriteIndent(xmlSaveCtxtPtr ctxt, int extra)
{
    int level;

    if ((ctxt->options & XML_SAVE_NO_INDENT) ||
        (((ctxt->options & XML_SAVE_INDENT) == 0) &&
         (xmlIndentTreeOutput == 0)))
        return;

    level = ctxt->level + extra;
    if (level > ctxt->indent_nr)
        level = ctxt->indent_nr;
    xmlOutputBufferWrite(ctxt->buf, ctxt->indent_size * level, ctxt->indent);
}

/**
 * Write out formatting for non-significant whitespace output.
 *
 * @param ctxt  The save context
 * @param extra  Number of extra indents to apply to ctxt->level
 */
static void
xmlOutputBufferWriteWSNonSig(xmlSaveCtxtPtr ctxt, int extra)
{
    int i;
    if ((ctxt == NULL) || (ctxt->buf == NULL))
        return;
    xmlOutputBufferWrite(ctxt->buf, 1, "\n");
    for (i = 0; i < (ctxt->level + extra); i += ctxt->indent_nr) {
        xmlOutputBufferWrite(ctxt->buf, ctxt->indent_size *
                ((ctxt->level + extra - i) > ctxt->indent_nr ?
                 ctxt->indent_nr : (ctxt->level + extra - i)),
                ctxt->indent);
    }
}

/**
 * Dump a local Namespace definition.
 * Should be called in the context of attributes dumps.
 * If `ctxt` is supplied, `buf` should be its buffer.
 *
 * @param buf  the XML buffer output
 * @param cur  a namespace
 * @param ctxt  the output save context. Optional.
 */
static void
xmlNsDumpOutput(xmlOutputBufferPtr buf, xmlNsPtr cur, xmlSaveCtxtPtr ctxt) {
    unsigned escapeFlags = XML_ESCAPE_ATTR;

    if ((cur == NULL) || (buf == NULL)) return;

    if ((ctxt == NULL) || (ctxt->encoding == NULL))
        escapeFlags |= XML_ESCAPE_NON_ASCII;

    if ((cur->type == XML_LOCAL_NAMESPACE) && (cur->href != NULL)) {
	if (xmlStrEqual(cur->prefix, BAD_CAST "xml"))
	    return;

	if (ctxt != NULL && ctxt->format == 2)
	    xmlOutputBufferWriteWSNonSig(ctxt, 2);
	else
	    xmlOutputBufferWrite(buf, 1, " ");

        /* Within the context of an element attributes */
	if (cur->prefix != NULL) {
	    xmlOutputBufferWrite(buf, 6, "xmlns:");
	    xmlOutputBufferWriteString(buf, (const char *)cur->prefix);
	} else
	    xmlOutputBufferWrite(buf, 5, "xmlns");
        xmlOutputBufferWrite(buf, 2, "=\"");
        xmlSerializeText(buf, cur->href, SIZE_MAX, escapeFlags);
        xmlOutputBufferWrite(buf, 1, "\"");
    }
}

/**
 * Dump a list of local namespace definitions to a save context.
 * Should be called in the context of attribute dumps.
 *
 * @param ctxt  the save context
 * @param cur  the first namespace
 */
static void
xmlNsListDumpOutputCtxt(xmlSaveCtxtPtr ctxt, xmlNsPtr cur) {
    while (cur != NULL) {
        xmlNsDumpOutput(ctxt->buf, cur, ctxt);
	cur = cur->next;
    }
}

/**
 * Serialize a list of namespace definitions.
 *
 * @param buf  the XML buffer output
 * @param cur  the first namespace
 */
void
xmlNsListDumpOutput(xmlOutputBuffer *buf, xmlNs *cur) {
    while (cur != NULL) {
        xmlNsDumpOutput(buf, cur, NULL);
	cur = cur->next;
    }
}

/**
 * Dump the XML document DTD, if any.
 *
 * @param ctxt  the save context
 * @param dtd  the pointer to the DTD
 */
static void
xmlDtdDumpOutput(xmlSaveCtxtPtr ctxt, xmlDtdPtr dtd) {
    xmlOutputBufferPtr buf;
    xmlNodePtr cur;
    int format, level;

    if (dtd == NULL) return;
    if ((ctxt == NULL) || (ctxt->buf == NULL))
        return;
    buf = ctxt->buf;
    xmlOutputBufferWrite(buf, 10, "<!DOCTYPE ");
    xmlOutputBufferWriteString(buf, (const char *)dtd->name);
    if (dtd->ExternalID != NULL) {
	xmlOutputBufferWrite(buf, 8, " PUBLIC ");
	xmlOutputBufferWriteQuotedString(buf, dtd->ExternalID);
	xmlOutputBufferWrite(buf, 1, " ");
	xmlOutputBufferWriteQuotedString(buf, dtd->SystemID);
    }  else if (dtd->SystemID != NULL) {
	xmlOutputBufferWrite(buf, 8, " SYSTEM ");
	xmlOutputBufferWriteQuotedString(buf, dtd->SystemID);
    }
    if ((dtd->entities == NULL) && (dtd->elements == NULL) &&
        (dtd->attributes == NULL) && (dtd->notations == NULL) &&
	(dtd->pentities == NULL)) {
	xmlOutputBufferWrite(buf, 1, ">");
	return;
    }
    xmlOutputBufferWrite(buf, 3, " [\n");
    /*
     * Dump the notations first they are not in the DTD children list
     * Do this only on a standalone DTD or on the internal subset though.
     */
    if ((dtd->notations != NULL) && ((dtd->doc == NULL) ||
        (dtd->doc->intSubset == dtd))) {
        xmlBufDumpNotationTable(buf, (xmlNotationTablePtr) dtd->notations);
    }
    format = ctxt->format;
    level = ctxt->level;
    ctxt->format = 0;
    ctxt->level = -1;
    for (cur = dtd->children; cur != NULL; cur = cur->next) {
        xmlNodeDumpOutputInternal(ctxt, cur);
    }
    ctxt->format = format;
    ctxt->level = level;
    xmlOutputBufferWrite(buf, 2, "]>");
}

/**
 * Dump an XML attribute
 *
 * @param ctxt  the save context
 * @param cur  the attribute pointer
 */
static void
xmlAttrDumpOutput(xmlSaveCtxtPtr ctxt, xmlAttrPtr cur) {
    xmlOutputBufferPtr buf;

    if (cur == NULL) return;
    buf = ctxt->buf;
    if (buf == NULL) return;
    if (ctxt->format == 2)
        xmlOutputBufferWriteWSNonSig(ctxt, 2);
    else
        xmlOutputBufferWrite(buf, 1, " ");
    if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
        xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
	xmlOutputBufferWrite(buf, 1, ":");
    }
    xmlOutputBufferWriteString(buf, (const char *)cur->name);
    xmlOutputBufferWrite(buf, 2, "=\"");
#ifdef LIBXML_HTML_ENABLED
    if ((ctxt->options & XML_SAVE_XHTML) &&
        (cur->ns == NULL) &&
        ((cur->children == NULL) ||
         (cur->children->content == NULL) ||
         (cur->children->content[0] == 0)) &&
        (htmlIsBooleanAttr(cur->name))) {
        xmlOutputBufferWriteString(buf, (const char *) cur->name);
    } else
#endif
    {
        xmlSaveWriteAttrContent(ctxt, cur);
    }
    xmlOutputBufferWrite(buf, 1, "\"");
}

#ifdef LIBXML_HTML_ENABLED
/**
 * Dump an HTML node, recursive behaviour, children are printed too.
 *
 * @param ctxt  the save context
 * @param cur  the current node
 */
static int
htmlNodeDumpOutputInternal(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
    int switched_encoding = 0;
    int format = 0;

    xmlInitParser();

    if (ctxt->encoding == NULL) {
        const char *encoding = NULL;

        if (cur->doc != NULL)
            encoding = (char *) cur->doc->encoding;

        if (encoding == NULL)
            encoding = "HTML";

	if (xmlSaveSwitchEncoding(ctxt, encoding) < 0)
	    return(-1);
	switched_encoding = 1;
    }

    if (ctxt->options & XML_SAVE_FORMAT)
        format = 1;

    htmlNodeDumpInternal(ctxt->buf, cur, (char *) ctxt->encoding, format);

    if (switched_encoding) {
	xmlSaveClearEncoding(ctxt);
    }

    return(0);
}
#endif

/**
 * Dump an XML node, recursive behaviour, children are printed too.
 *
 * @param ctxt  the save context
 * @param cur  the current node
 */
static void
xmlNodeDumpOutputInternal(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
    int format = ctxt->format;
    xmlNodePtr tmp, root, unformattedNode = NULL, parent;
    xmlAttrPtr attr;
    xmlChar *start, *end;
    xmlOutputBufferPtr buf;

    if (cur == NULL) return;
    buf = ctxt->buf;

    root = cur;
    parent = cur->parent;
    while (1) {
        switch (cur->type) {
        case XML_DOCUMENT_NODE:
        case XML_HTML_DOCUMENT_NODE:
	    xmlSaveDocInternal(ctxt, (xmlDocPtr) cur, ctxt->encoding);
	    break;

        case XML_DTD_NODE:
            xmlDtdDumpOutput(ctxt, (xmlDtdPtr) cur);
            break;

        case XML_DOCUMENT_FRAG_NODE:
            /* Always validate cur->parent when descending. */
            if ((cur->parent == parent) && (cur->children != NULL)) {
                parent = cur;
                cur = cur->children;
                continue;
            }
	    break;

        case XML_ELEMENT_DECL:
            xmlBufDumpElementDecl(buf, (xmlElementPtr) cur);
            break;

        case XML_ATTRIBUTE_DECL:
            xmlSaveWriteAttributeDecl(ctxt, (xmlAttributePtr) cur);
            break;

        case XML_ENTITY_DECL:
            xmlBufDumpEntityDecl(buf, (xmlEntityPtr) cur);
            break;

        case XML_ELEMENT_NODE:
	    if ((cur != root) && (ctxt->format == 1))
                xmlSaveWriteIndent(ctxt, 0);

            /*
             * Some users like lxml are known to pass nodes with a corrupted
             * tree structure. Fall back to a recursive call to handle this
             * case.
             */
            if ((cur->parent != parent) && (cur->children != NULL)) {
                xmlNodeDumpOutputInternal(ctxt, cur);
                break;
            }

            xmlOutputBufferWrite(buf, 1, "<");
            if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
                xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
                xmlOutputBufferWrite(buf, 1, ":");
            }
            xmlOutputBufferWriteString(buf, (const char *)cur->name);
            if (cur->nsDef)
                xmlNsListDumpOutputCtxt(ctxt, cur->nsDef);
            for (attr = cur->properties; attr != NULL; attr = attr->next)
                xmlAttrDumpOutput(ctxt, attr);

            if (cur->children == NULL) {
                if ((ctxt->options & XML_SAVE_NO_EMPTY) == 0) {
                    if (ctxt->format == 2)
                        xmlOutputBufferWriteWSNonSig(ctxt, 0);
                    xmlOutputBufferWrite(buf, 2, "/>");
                } else {
                    if (ctxt->format == 2)
                        xmlOutputBufferWriteWSNonSig(ctxt, 1);
                    xmlOutputBufferWrite(buf, 3, "></");
                    if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
                        xmlOutputBufferWriteString(buf,
                                (const char *)cur->ns->prefix);
                        xmlOutputBufferWrite(buf, 1, ":");
                    }
                    xmlOutputBufferWriteString(buf, (const char *)cur->name);
                    if (ctxt->format == 2)
                        xmlOutputBufferWriteWSNonSig(ctxt, 0);
                    xmlOutputBufferWrite(buf, 1, ">");
                }
            } else {
                if (ctxt->format == 1) {
                    tmp = cur->children;
                    while (tmp != NULL) {
                        if ((tmp->type == XML_TEXT_NODE) ||
                            (tmp->type == XML_CDATA_SECTION_NODE) ||
                            (tmp->type == XML_ENTITY_REF_NODE)) {
                            ctxt->format = 0;
                            unformattedNode = cur;
                            break;
                        }
                        tmp = tmp->next;
                    }
                }
                if (ctxt->format == 2)
                    xmlOutputBufferWriteWSNonSig(ctxt, 1);
                xmlOutputBufferWrite(buf, 1, ">");
                if (ctxt->format == 1) xmlOutputBufferWrite(buf, 1, "\n");
                if (ctxt->level >= 0) ctxt->level++;
                parent = cur;
                cur = cur->children;
                continue;
            }

            break;

        case XML_TEXT_NODE:
	    if (cur->content == NULL)
                break;
	    if (cur->name != xmlStringTextNoenc) {
                if (ctxt->escape)
                    xmlOutputBufferWriteEscape(buf, cur->content,
                                               ctxt->escape);
#ifdef TEST_OUTPUT_BUFFER_WRITE_ESCAPE
                else if (ctxt->encoding)
                    xmlOutputBufferWriteEscape(buf, cur->content, NULL);
#endif
                else
                    xmlSaveWriteText(ctxt, cur->content, /* flags */ 0);
	    } else {
		/*
		 * Disable escaping, needed for XSLT
		 */
		xmlOutputBufferWriteString(buf, (const char *) cur->content);
	    }
	    break;

        case XML_PI_NODE:
	    if ((cur != root) && (ctxt->format == 1))
                xmlSaveWriteIndent(ctxt, 0);

            if (cur->content != NULL) {
                xmlOutputBufferWrite(buf, 2, "<?");
                xmlOutputBufferWriteString(buf, (const char *)cur->name);
                if (cur->content != NULL) {
                    if (ctxt->format == 2)
                        xmlOutputBufferWriteWSNonSig(ctxt, 0);
                    else
                        xmlOutputBufferWrite(buf, 1, " ");
                    xmlOutputBufferWriteString(buf,
                            (const char *)cur->content);
                }
                xmlOutputBufferWrite(buf, 2, "?>");
            } else {
                xmlOutputBufferWrite(buf, 2, "<?");
                xmlOutputBufferWriteString(buf, (const char *)cur->name);
                if (ctxt->format == 2)
                    xmlOutputBufferWriteWSNonSig(ctxt, 0);
                xmlOutputBufferWrite(buf, 2, "?>");
            }
            break;

        case XML_COMMENT_NODE:
	    if ((cur != root) && (ctxt->format == 1))
                xmlSaveWriteIndent(ctxt, 0);

            if (cur->content != NULL) {
                xmlOutputBufferWrite(buf, 4, "<!--");
                xmlOutputBufferWriteString(buf, (const char *)cur->content);
                xmlOutputBufferWrite(buf, 3, "-->");
            }
            break;

        case XML_ENTITY_REF_NODE:
            xmlOutputBufferWrite(buf, 1, "&");
            xmlOutputBufferWriteString(buf, (const char *)cur->name);
            xmlOutputBufferWrite(buf, 1, ";");
            break;

        case XML_CDATA_SECTION_NODE:
            if (cur->content == NULL || *cur->content == '\0') {
                xmlOutputBufferWrite(buf, 12, "<![CDATA[]]>");
            } else {
                start = end = cur->content;
                while (*end != '\0') {
                    if ((*end == ']') && (*(end + 1) == ']') &&
                        (*(end + 2) == '>')) {
                        end = end + 2;
                        xmlOutputBufferWrite(buf, 9, "<![CDATA[");
                        xmlOutputBufferWrite(buf, end - start,
                                (const char *)start);
                        xmlOutputBufferWrite(buf, 3, "]]>");
                        start = end;
                    }
                    end++;
                }
                if (start != end) {
                    xmlOutputBufferWrite(buf, 9, "<![CDATA[");
                    xmlOutputBufferWriteString(buf, (const char *)start);
                    xmlOutputBufferWrite(buf, 3, "]]>");
                }
            }
            break;

        case XML_ATTRIBUTE_NODE:
            xmlAttrDumpOutput(ctxt, (xmlAttrPtr) cur);
            break;

        case XML_NAMESPACE_DECL:
            xmlNsDumpOutput(buf, (xmlNsPtr) cur, ctxt);
            break;

        default:
            break;
        }

        while (1) {
            if (cur == root)
                return;
            if ((ctxt->format == 1) &&
                (cur->type != XML_XINCLUDE_START) &&
                (cur->type != XML_XINCLUDE_END))
                xmlOutputBufferWrite(buf, 1, "\n");
            if (cur->next != NULL) {
                cur = cur->next;
                break;
            }

            cur = parent;
            /* cur->parent was validated when descending. */
            parent = cur->parent;

            if (cur->type == XML_ELEMENT_NODE) {
                if (ctxt->level > 0) ctxt->level--;
                if (ctxt->format == 1)
                    xmlSaveWriteIndent(ctxt, 0);

                xmlOutputBufferWrite(buf, 2, "</");
                if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
                    xmlOutputBufferWriteString(buf,
                            (const char *)cur->ns->prefix);
                    xmlOutputBufferWrite(buf, 1, ":");
                }

                xmlOutputBufferWriteString(buf, (const char *)cur->name);
                if (ctxt->format == 2)
                    xmlOutputBufferWriteWSNonSig(ctxt, 0);
                xmlOutputBufferWrite(buf, 1, ">");

                if (cur == unformattedNode) {
                    ctxt->format = format;
                    unformattedNode = NULL;
                }
            }
        }
    }
}

/**
 * Dump an XML document.
 *
 * @param ctxt  the save context
 * @param cur  the document
 * @param encoding  character encoding (optional)
 */
static int
xmlSaveDocInternal(xmlSaveCtxtPtr ctxt, xmlDocPtr cur,
                   const xmlChar *encoding) {
#ifdef LIBXML_HTML_ENABLED
    xmlDtdPtr dtd;
    int is_xhtml = 0;
#endif
    xmlOutputBufferPtr buf = ctxt->buf;
    int switched_encoding = 0;

    xmlInitParser();

    if ((cur->type != XML_HTML_DOCUMENT_NODE) &&
        (cur->type != XML_DOCUMENT_NODE))
	 return(-1);

    if (encoding == NULL)
	encoding = cur->encoding;

    if (((cur->type == XML_HTML_DOCUMENT_NODE) &&
         ((ctxt->options & XML_SAVE_AS_XML) == 0) &&
         ((ctxt->options & XML_SAVE_XHTML) == 0)) ||
        (ctxt->options & XML_SAVE_AS_HTML)) {
#ifdef LIBXML_HTML_ENABLED
        int format = 0;

	if (ctxt->encoding == NULL) {
            if (encoding == NULL)
                encoding = BAD_CAST "HTML";

	    if (xmlSaveSwitchEncoding(ctxt, (const char*) encoding) < 0) {
		return(-1);
	    }
            switched_encoding = 1;
	}

        if (ctxt->options & XML_SAVE_FORMAT)
            format = 1;
        htmlNodeDumpInternal(buf, (htmlNodePtr) cur, (char *) ctxt->encoding,
                             format);
#else
        return(-1);
#endif
    } else if ((cur->type == XML_DOCUMENT_NODE) ||
               (ctxt->options & XML_SAVE_AS_XML) ||
               (ctxt->options & XML_SAVE_XHTML)) {
	if ((encoding != NULL) && (ctxt->encoding == NULL)) {
            if (xmlSaveSwitchEncoding(ctxt, (const char *) encoding) < 0)
                return(-1);
            switched_encoding = 1;
	}

	/*
	 * Save the XML declaration
	 */
	if ((ctxt->options & XML_SAVE_NO_DECL) == 0) {
	    xmlOutputBufferWrite(buf, 15, "<?xml version=\"");
	    if (cur->version != NULL)
		xmlOutputBufferWriteString(buf, (char *) cur->version);
	    else
		xmlOutputBufferWrite(buf, 3, "1.0");
	    xmlOutputBufferWrite(buf, 1, "\"");
	    if (encoding != NULL) {
		xmlOutputBufferWrite(buf, 11, " encoding=\"");
		xmlOutputBufferWriteString(buf, (char *) encoding);
	        xmlOutputBufferWrite(buf, 1, "\"");
	    }
	    switch (cur->standalone) {
		case 0:
		    xmlOutputBufferWrite(buf, 16, " standalone=\"no\"");
		    break;
		case 1:
		    xmlOutputBufferWrite(buf, 17, " standalone=\"yes\"");
		    break;
	    }
	    xmlOutputBufferWrite(buf, 3, "?>\n");
	}

#ifdef LIBXML_HTML_ENABLED
        if (ctxt->options & XML_SAVE_XHTML)
            is_xhtml = 1;
	if ((ctxt->options & XML_SAVE_NO_XHTML) == 0) {
	    dtd = xmlGetIntSubset(cur);
	    if (dtd != NULL) {
		is_xhtml = xmlIsXHTML(dtd->SystemID, dtd->ExternalID);
		if (is_xhtml < 0) is_xhtml = 0;
	    }
	}
#endif
	if (cur->children != NULL) {
	    xmlNodePtr child = cur->children;

	    while (child != NULL) {
		ctxt->level = 0;
#ifdef LIBXML_HTML_ENABLED
		if (is_xhtml)
		    xhtmlNodeDumpOutput(ctxt, child);
		else
#endif
		    xmlNodeDumpOutputInternal(ctxt, child);
                if ((child->type != XML_XINCLUDE_START) &&
                    (child->type != XML_XINCLUDE_END))
                    xmlOutputBufferWrite(buf, 1, "\n");
		child = child->next;
	    }
	}
    }

    /*
     * Restore the state of the saving context at the end of the document
     */
    if (switched_encoding) {
	xmlSaveClearEncoding(ctxt);
    }

    return(0);
}

#ifdef LIBXML_HTML_ENABLED
/************************************************************************
 *									*
 *		Functions specific to XHTML serialization		*
 *									*
 ************************************************************************/

/**
 * Check if a node is an empty xhtml node
 *
 * @param node  the node
 * @returns 1 if the node is an empty node, 0 if not and -1 in case of error
 */
static int
xhtmlIsEmpty(xmlNodePtr node) {
    if (node == NULL)
	return(-1);
    if (node->type != XML_ELEMENT_NODE)
	return(0);
    if ((node->ns != NULL) && (!xmlStrEqual(node->ns->href, XHTML_NS_NAME)))
	return(0);
    if (node->children != NULL)
	return(0);
    switch (node->name ? node->name[0] : 0) {
	case 'a':
	    if (xmlStrEqual(node->name, BAD_CAST "area"))
		return(1);
	    return(0);
	case 'b':
	    if (xmlStrEqual(node->name, BAD_CAST "br"))
		return(1);
	    if (xmlStrEqual(node->name, BAD_CAST "base"))
		return(1);
	    if (xmlStrEqual(node->name, BAD_CAST "basefont"))
		return(1);
	    return(0);
	case 'c':
	    if (xmlStrEqual(node->name, BAD_CAST "col"))
		return(1);
	    return(0);
	case 'f':
	    if (xmlStrEqual(node->name, BAD_CAST "frame"))
		return(1);
	    return(0);
	case 'h':
	    if (xmlStrEqual(node->name, BAD_CAST "hr"))
		return(1);
	    return(0);
	case 'i':
	    if (xmlStrEqual(node->name, BAD_CAST "img"))
		return(1);
	    if (xmlStrEqual(node->name, BAD_CAST "input"))
		return(1);
	    if (xmlStrEqual(node->name, BAD_CAST "isindex"))
		return(1);
	    return(0);
	case 'l':
	    if (xmlStrEqual(node->name, BAD_CAST "link"))
		return(1);
	    return(0);
	case 'm':
	    if (xmlStrEqual(node->name, BAD_CAST "meta"))
		return(1);
	    return(0);
	case 'p':
	    if (xmlStrEqual(node->name, BAD_CAST "param"))
		return(1);
	    return(0);
    }
    return(0);
}

/**
 * Dump a list of XML attributes
 *
 * @param ctxt  the save context
 * @param cur  the first attribute pointer
 */
static void
xhtmlAttrListDumpOutput(xmlSaveCtxtPtr ctxt, xmlAttrPtr cur) {
    xmlAttrPtr xml_lang = NULL;
    xmlAttrPtr lang = NULL;
    xmlAttrPtr name = NULL;
    xmlAttrPtr id = NULL;
    xmlNodePtr parent;
    xmlOutputBufferPtr buf;

    if (cur == NULL) return;
    buf = ctxt->buf;
    parent = cur->parent;
    while (cur != NULL) {
	if ((cur->ns == NULL) && (xmlStrEqual(cur->name, BAD_CAST "id")))
	    id = cur;
	else
	if ((cur->ns == NULL) && (xmlStrEqual(cur->name, BAD_CAST "name")))
	    name = cur;
	else
	if ((cur->ns == NULL) && (xmlStrEqual(cur->name, BAD_CAST "lang")))
	    lang = cur;
	else
	if ((cur->ns != NULL) && (xmlStrEqual(cur->name, BAD_CAST "lang")) &&
	    (xmlStrEqual(cur->ns->prefix, BAD_CAST "xml")))
	    xml_lang = cur;
        xmlAttrDumpOutput(ctxt, cur);
	cur = cur->next;
    }
    /*
     * C.8
     */
    if ((name != NULL) && (id == NULL)) {
	if ((parent != NULL) && (parent->name != NULL) &&
	    ((xmlStrEqual(parent->name, BAD_CAST "a")) ||
	     (xmlStrEqual(parent->name, BAD_CAST "p")) ||
	     (xmlStrEqual(parent->name, BAD_CAST "div")) ||
	     (xmlStrEqual(parent->name, BAD_CAST "img")) ||
	     (xmlStrEqual(parent->name, BAD_CAST "map")) ||
	     (xmlStrEqual(parent->name, BAD_CAST "applet")) ||
	     (xmlStrEqual(parent->name, BAD_CAST "form")) ||
	     (xmlStrEqual(parent->name, BAD_CAST "frame")) ||
	     (xmlStrEqual(parent->name, BAD_CAST "iframe")))) {
	    xmlOutputBufferWrite(buf, 5, " id=\"");
            xmlSaveWriteAttrContent(ctxt, name);
	    xmlOutputBufferWrite(buf, 1, "\"");
	}
    }
    /*
     * C.7.
     */
    if ((lang != NULL) && (xml_lang == NULL)) {
	xmlOutputBufferWrite(buf, 11, " xml:lang=\"");
        xmlSaveWriteAttrContent(ctxt, lang);
	xmlOutputBufferWrite(buf, 1, "\"");
    } else
    if ((xml_lang != NULL) && (lang == NULL)) {
	xmlOutputBufferWrite(buf, 7, " lang=\"");
        xmlSaveWriteAttrContent(ctxt, xml_lang);
	xmlOutputBufferWrite(buf, 1, "\"");
    }
}

/**
 * Dump an XHTML node, recursive behaviour, children are printed too.
 *
 * @param ctxt  the save context
 * @param cur  the current node
 */
static void
xhtmlNodeDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
    int format = ctxt->format, addmeta, oldoptions;
    xmlNodePtr tmp, root, unformattedNode = NULL, parent;
    xmlChar *start, *end;
    xmlOutputBufferPtr buf = ctxt->buf;

    if (cur == NULL) return;

    oldoptions = ctxt->options;
    ctxt->options |= XML_SAVE_XHTML;

    root = cur;
    parent = cur->parent;
    while (1) {
        switch (cur->type) {
        case XML_DOCUMENT_NODE:
        case XML_HTML_DOCUMENT_NODE:
            xmlSaveDocInternal(ctxt, (xmlDocPtr) cur, ctxt->encoding);
	    break;

        case XML_NAMESPACE_DECL:
	    xmlNsDumpOutput(buf, (xmlNsPtr) cur, ctxt);
	    break;

        case XML_DTD_NODE:
            xmlDtdDumpOutput(ctxt, (xmlDtdPtr) cur);
	    break;

        case XML_DOCUMENT_FRAG_NODE:
            /* Always validate cur->parent when descending. */
            if ((cur->parent == parent) && (cur->children != NULL)) {
                parent = cur;
                cur = cur->children;
                continue;
            }
            break;

        case XML_ELEMENT_DECL:
            xmlBufDumpElementDecl(buf, (xmlElementPtr) cur);
	    break;

        case XML_ATTRIBUTE_DECL:
            xmlSaveWriteAttributeDecl(ctxt, (xmlAttributePtr) cur);
	    break;

        case XML_ENTITY_DECL:
            xmlBufDumpEntityDecl(buf, (xmlEntityPtr) cur);
	    break;

        case XML_ELEMENT_NODE:
            addmeta = 0;

	    if ((cur != root) && (ctxt->format == 1))
                xmlSaveWriteIndent(ctxt, 0);

            /*
             * Some users like lxml are known to pass nodes with a corrupted
             * tree structure. Fall back to a recursive call to handle this
             * case.
             */
            if ((cur->parent != parent) && (cur->children != NULL)) {
                xhtmlNodeDumpOutput(ctxt, cur);
                break;
            }

            xmlOutputBufferWrite(buf, 1, "<");
            if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
                xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
                xmlOutputBufferWrite(buf, 1, ":");
            }

            xmlOutputBufferWriteString(buf, (const char *)cur->name);
            if (cur->nsDef)
                xmlNsListDumpOutputCtxt(ctxt, cur->nsDef);
            if ((xmlStrEqual(cur->name, BAD_CAST "html") &&
                (cur->ns == NULL) && (cur->nsDef == NULL))) {
                /*
                 * 3.1.1. Strictly Conforming Documents A.3.1.1 3/
                 */
                xmlOutputBufferWriteString(buf,
                        " xmlns=\"http://www.w3.org/1999/xhtml\"");
            }
            if (cur->properties != NULL)
                xhtmlAttrListDumpOutput(ctxt, cur->properties);

            if ((parent != NULL) &&
                (parent->parent == (xmlNodePtr) cur->doc) &&
                xmlStrEqual(cur->name, BAD_CAST"head") &&
                xmlStrEqual(parent->name, BAD_CAST"html")) {

                tmp = cur->children;
                while (tmp != NULL) {
                    if (xmlStrEqual(tmp->name, BAD_CAST"meta")) {
                        int res;
                        xmlChar *httpequiv;

                        res = xmlNodeGetAttrValue(tmp, BAD_CAST "http-equiv",
                                                  NULL, &httpequiv);
                        if (res < 0) {
                            xmlSaveErrMemory(buf);
                        } else if (res == 0) {
                            if (xmlStrcasecmp(httpequiv,
                                        BAD_CAST"Content-Type") == 0) {
                                xmlFree(httpequiv);
                                break;
                            }
                            xmlFree(httpequiv);
                        }
                    }
                    tmp = tmp->next;
                }
                if (tmp == NULL)
                    addmeta = 1;
            }

            if (cur->children == NULL) {
                if (((cur->ns == NULL) || (cur->ns->prefix == NULL)) &&
                    ((xhtmlIsEmpty(cur) == 1) && (addmeta == 0))) {
                    /*
                     * C.2. Empty Elements
                     */
                    xmlOutputBufferWrite(buf, 3, " />");
                } else {
                    if (addmeta == 1) {
                        xmlOutputBufferWrite(buf, 1, ">");
                        if (ctxt->format == 1) {
                            xmlOutputBufferWrite(buf, 1, "\n");
                            xmlSaveWriteIndent(ctxt, 1);
                        }
                        xmlOutputBufferWriteString(buf,
                                "<meta http-equiv=\"Content-Type\" "
                                "content=\"text/html; charset=");
                        if (ctxt->encoding) {
                            xmlOutputBufferWriteString(buf,
                                    (const char *)ctxt->encoding);
                        } else {
                            xmlOutputBufferWrite(buf, 5, "UTF-8");
                        }
                        xmlOutputBufferWrite(buf, 4, "\" />");
                        if (ctxt->format == 1)
                            xmlOutputBufferWrite(buf, 1, "\n");
                    } else {
                        xmlOutputBufferWrite(buf, 1, ">");
                    }
                    /*
                     * C.3. Element Minimization and Empty Element Content
                     */
                    xmlOutputBufferWrite(buf, 2, "</");
                    if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
                        xmlOutputBufferWriteString(buf,
                                (const char *)cur->ns->prefix);
                        xmlOutputBufferWrite(buf, 1, ":");
                    }
                    xmlOutputBufferWriteString(buf, (const char *)cur->name);
                    xmlOutputBufferWrite(buf, 1, ">");
                }
            } else {
                xmlOutputBufferWrite(buf, 1, ">");
                if (addmeta == 1) {
                    if (ctxt->format == 1) {
                        xmlOutputBufferWrite(buf, 1, "\n");
                        xmlSaveWriteIndent(ctxt, 1);
                    }
                    xmlOutputBufferWriteString(buf,
                            "<meta http-equiv=\"Content-Type\" "
                            "content=\"text/html; charset=");
                    if (ctxt->encoding) {
                        xmlOutputBufferWriteString(buf,
                                (const char *)ctxt->encoding);
                    } else {
                        xmlOutputBufferWrite(buf, 5, "UTF-8");
                    }
                    xmlOutputBufferWrite(buf, 4, "\" />");
                }

                if (ctxt->format == 1) {
                    tmp = cur->children;
                    while (tmp != NULL) {
                        if ((tmp->type == XML_TEXT_NODE) ||
                            (tmp->type == XML_ENTITY_REF_NODE)) {
                            unformattedNode = cur;
                            ctxt->format = 0;
                            break;
                        }
                        tmp = tmp->next;
                    }
                }

                if (ctxt->format == 1) xmlOutputBufferWrite(buf, 1, "\n");
                if (ctxt->level >= 0) ctxt->level++;
                parent = cur;
                cur = cur->children;
                continue;
            }

            break;

        case XML_TEXT_NODE:
	    if (cur->content == NULL)
                break;
	    if ((cur->name == xmlStringText) ||
		(cur->name != xmlStringTextNoenc)) {
                if (ctxt->escape)
                    xmlOutputBufferWriteEscape(buf, cur->content,
                                               ctxt->escape);
                else
                    xmlSaveWriteText(ctxt, cur->content, /* flags */ 0);
	    } else {
		/*
		 * Disable escaping, needed for XSLT
		 */
		xmlOutputBufferWriteString(buf, (const char *) cur->content);
	    }
	    break;

        case XML_PI_NODE:
            if (cur->content != NULL) {
                xmlOutputBufferWrite(buf, 2, "<?");
                xmlOutputBufferWriteString(buf, (const char *)cur->name);
                if (cur->content != NULL) {
                    xmlOutputBufferWrite(buf, 1, " ");
                    xmlOutputBufferWriteString(buf,
                            (const char *)cur->content);
                }
                xmlOutputBufferWrite(buf, 2, "?>");
            } else {
                xmlOutputBufferWrite(buf, 2, "<?");
                xmlOutputBufferWriteString(buf, (const char *)cur->name);
                xmlOutputBufferWrite(buf, 2, "?>");
            }
            break;

        case XML_COMMENT_NODE:
            if (cur->content != NULL) {
                xmlOutputBufferWrite(buf, 4, "<!--");
                xmlOutputBufferWriteString(buf, (const char *)cur->content);
                xmlOutputBufferWrite(buf, 3, "-->");
            }
            break;

        case XML_ENTITY_REF_NODE:
            xmlOutputBufferWrite(buf, 1, "&");
            xmlOutputBufferWriteString(buf, (const char *)cur->name);
            xmlOutputBufferWrite(buf, 1, ";");
            break;

        case XML_CDATA_SECTION_NODE:
            if (cur->content == NULL || *cur->content == '\0') {
                xmlOutputBufferWrite(buf, 12, "<![CDATA[]]>");
            } else {
                start = end = cur->content;
                while (*end != '\0') {
                    if (*end == ']' && *(end + 1) == ']' &&
                        *(end + 2) == '>') {
                        end = end + 2;
                        xmlOutputBufferWrite(buf, 9, "<![CDATA[");
                        xmlOutputBufferWrite(buf, end - start,
                                (const char *)start);
                        xmlOutputBufferWrite(buf, 3, "]]>");
                        start = end;
                    }
                    end++;
                }
                if (start != end) {
                    xmlOutputBufferWrite(buf, 9, "<![CDATA[");
                    xmlOutputBufferWriteString(buf, (const char *)start);
                    xmlOutputBufferWrite(buf, 3, "]]>");
                }
            }
            break;

        case XML_ATTRIBUTE_NODE:
            xmlAttrDumpOutput(ctxt, (xmlAttrPtr) cur);
	    break;

        default:
            break;
        }

        while (1) {
            if (cur == root)
                return;
            if (ctxt->format == 1)
                xmlOutputBufferWrite(buf, 1, "\n");
            if (cur->next != NULL) {
                cur = cur->next;
                break;
            }

            cur = parent;
            /* cur->parent was validated when descending. */
            parent = cur->parent;

            if (cur->type == XML_ELEMENT_NODE) {
                if (ctxt->level > 0) ctxt->level--;
                if (ctxt->format == 1)
                    xmlSaveWriteIndent(ctxt, 0);

                xmlOutputBufferWrite(buf, 2, "</");
                if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
                    xmlOutputBufferWriteString(buf,
                            (const char *)cur->ns->prefix);
                    xmlOutputBufferWrite(buf, 1, ":");
                }

                xmlOutputBufferWriteString(buf, (const char *)cur->name);
                xmlOutputBufferWrite(buf, 1, ">");

                if (cur == unformattedNode) {
                    ctxt->format = format;
                    unformattedNode = NULL;
                }
            }
        }
    }

    ctxt->options = oldoptions;
}
#endif

/************************************************************************
 *									*
 *			Public entry points				*
 *									*
 ************************************************************************/

/**
 * Create a document saving context serializing to a file descriptor
 * with the encoding and the options given.
 *
 * If `encoding` is NULL, #xmlSaveDoc uses the document's
 * encoding and #xmlSaveTree uses UTF-8.
 *
 * This function doesn't allow to distinguish unsupported
 * encoding errors from failed memory allocations.
 *
 * @param fd  a file descriptor number
 * @param encoding  the encoding name to use (optional)
 * @param options  a set of xmlSaveOptions
 * @returns a new serialization context or NULL in case of error.
 */
xmlSaveCtxt *
xmlSaveToFd(int fd, const char *encoding, int options)
{
    xmlSaveCtxtPtr ret;

    ret = xmlNewSaveCtxt(encoding, options);
    if (ret == NULL) return(NULL);
    ret->buf = xmlOutputBufferCreateFd(fd, ret->handler);
    if (ret->buf == NULL) {
        xmlCharEncCloseFunc(ret->handler);
	xmlFreeSaveCtxt(ret);
	return(NULL);
    }
    return(ret);
}

/**
 * Create a document saving context serializing to a filename
 * with the encoding and the options given.
 *
 * If `encoding` is NULL, #xmlSaveDoc uses the document's
 * encoding and #xmlSaveTree uses UTF-8.
 *
 * This function doesn't allow to distinguish unsupported
 * encoding errors from failed memory allocations.
 *
 * @param filename  a file name or an URL
 * @param encoding  the encoding name to use or NULL
 * @param options  a set of xmlSaveOptions
 * @returns a new serialization context or NULL in case of error.
 */
xmlSaveCtxt *
xmlSaveToFilename(const char *filename, const char *encoding, int options)
{
    xmlSaveCtxtPtr ret;
    int compression = 0; /* TODO handle compression option */

    ret = xmlNewSaveCtxt(encoding, options);
    if (ret == NULL) return(NULL);
    ret->buf = xmlOutputBufferCreateFilename(filename, ret->handler,
                                             compression);
    if (ret->buf == NULL) {
        xmlCharEncCloseFunc(ret->handler);
	xmlFreeSaveCtxt(ret);
	return(NULL);
    }
    return(ret);
}

/**
 * Create a document saving context serializing to a buffer
 * with the encoding and the options given.
 *
 * If `encoding` is NULL, #xmlSaveDoc uses the document's
 * encoding and #xmlSaveTree uses UTF-8.
 *
 * This function doesn't allow to distinguish unsupported
 * encoding errors from failed memory allocations.
 *
 * @param buffer  a buffer
 * @param encoding  the encoding name to use or NULL
 * @param options  a set of xmlSaveOptions
 * @returns a new serialization context or NULL in case of error.
 */

xmlSaveCtxt *
xmlSaveToBuffer(xmlBuffer *buffer, const char *encoding, int options)
{
    xmlSaveCtxtPtr ret;

    ret = xmlNewSaveCtxt(encoding, options);
    if (ret == NULL) return(NULL);
    ret->buf = xmlOutputBufferCreateBuffer(buffer, ret->handler);
    if (ret->buf == NULL) {
        xmlCharEncCloseFunc(ret->handler);
	xmlFreeSaveCtxt(ret);
	return(NULL);
    }
    return(ret);
}

/**
 * Create a document saving context serializing to a file descriptor
 * with the encoding and the options given
 *
 * If `encoding` is NULL, #xmlSaveDoc uses the document's
 * encoding and #xmlSaveTree uses UTF-8.
 *
 * This function doesn't allow to distinguish unsupported
 * encoding errors from failed memory allocations.
 *
 * @param iowrite  an I/O write function
 * @param ioclose  an I/O close function
 * @param ioctx  an I/O handler
 * @param encoding  the encoding name to use or NULL
 * @param options  a set of xmlSaveOptions
 * @returns a new serialization context or NULL in case of error.
 */
xmlSaveCtxt *
xmlSaveToIO(xmlOutputWriteCallback iowrite,
            xmlOutputCloseCallback ioclose,
            void *ioctx, const char *encoding, int options)
{
    xmlSaveCtxtPtr ret;

    ret = xmlNewSaveCtxt(encoding, options);
    if (ret == NULL) return(NULL);
    ret->buf = xmlOutputBufferCreateIO(iowrite, ioclose, ioctx, ret->handler);
    if (ret->buf == NULL) {
        xmlCharEncCloseFunc(ret->handler);
	xmlFreeSaveCtxt(ret);
	return(NULL);
    }
    return(ret);
}

/**
 * Serialize a document.
 *
 * If the save context has no encoding, uses the document's
 * encoding. If the document has no encoding, uses ASCII
 * without an encoding declaration.
 *
 * @param ctxt  a document saving context
 * @param doc  a document
 * @returns 0 on success or -1 in case of error.
 */
long
xmlSaveDoc(xmlSaveCtxt *ctxt, xmlDoc *doc)
{
    long ret = 0;

    if ((ctxt == NULL) || (doc == NULL)) return(-1);
    if (xmlSaveDocInternal(ctxt, doc, ctxt->encoding) < 0)
        return(-1);
    return(ret);
}

/**
 * Serialize a subtree starting.
 *
 * If the save context has no encoding, uses UTF-8.
 *
 * @param ctxt  a document saving context
 * @param cur  the root of the subtree to save
 * @returns 0 on success or -1 in case of error.
 */
long
xmlSaveTree(xmlSaveCtxt *ctxt, xmlNode *cur)
{
    long ret = 0;

    if ((ctxt == NULL) || (cur == NULL)) return(-1);
#ifdef LIBXML_HTML_ENABLED
    if (ctxt->options & XML_SAVE_XHTML) {
        xhtmlNodeDumpOutput(ctxt, cur);
        return(ret);
    }
    if (((cur->type != XML_NAMESPACE_DECL) && (cur->doc != NULL) &&
         (cur->doc->type == XML_HTML_DOCUMENT_NODE) &&
         ((ctxt->options & XML_SAVE_AS_XML) == 0)) ||
        (ctxt->options & XML_SAVE_AS_HTML)) {
	htmlNodeDumpOutputInternal(ctxt, cur);
	return(ret);
    }
#endif
    xmlNodeDumpOutputInternal(ctxt, cur);
    return(ret);
}

/**
 * Serialize a notation declaration.
 *
 * @param ctxt  save context
 * @param cur  notation
 * @returns 0 on succes, -1 on error.
 */
int
xmlSaveNotationDecl(xmlSaveCtxt *ctxt, xmlNotation *cur) {
    if (ctxt == NULL)
        return(-1);
    xmlBufDumpNotationDecl(ctxt->buf, cur);
    return(0);
}

/**
 * Serialize notation declarations of a document.
 *
 * @param ctxt  save context
 * @param cur  notation table
 * @returns 0 on succes, -1 on error.
 */
int
xmlSaveNotationTable(xmlSaveCtxt *ctxt, xmlNotationTable *cur) {
    if (ctxt == NULL)
        return(-1);
    xmlBufDumpNotationTable(ctxt->buf, cur);
    return(0);
}

/**
 * Flush a document saving context, i.e. make sure that all
 * buffered input has been processed.
 *
 * @param ctxt  a document saving context
 * @returns the number of bytes written or -1 in case of error.
 */
int
xmlSaveFlush(xmlSaveCtxt *ctxt)
{
    if (ctxt == NULL) return(-1);
    if (ctxt->buf == NULL) return(-1);
    return(xmlOutputBufferFlush(ctxt->buf));
}

/**
 * Close a document saving context, i.e. make sure that all
 * buffered input has been processed and free the context struct.
 *
 * @param ctxt  a document saving context
 * @returns the number of bytes written or -1 in case of error.
 */
int
xmlSaveClose(xmlSaveCtxt *ctxt)
{
    int ret;

    if (ctxt == NULL) return(-1);
    ret = xmlSaveFlush(ctxt);
    xmlFreeSaveCtxt(ctxt);
    return(ret);
}

/**
 * Close a document saving context, i.e. make sure that all
 * buffered input has been processed and free the context struct.
 *
 * @since 2.13.0
 *
 * @param ctxt  a document saving context
 * @returns an xmlParserErrors code.
 */
xmlParserErrors
xmlSaveFinish(xmlSaveCtxt *ctxt)
{
    int ret;

    if (ctxt == NULL)
        return(XML_ERR_INTERNAL_ERROR);

    ret = xmlOutputBufferClose(ctxt->buf);
    ctxt->buf = NULL;
    if (ret < 0)
        ret = -ret;
    else
        ret = XML_ERR_OK;

    xmlFreeSaveCtxt(ctxt);
    return(ret);
}

/**
 * Set a custom escaping function to be used for text in element
 * content.
 *
 * @deprecated Don't use.
 *
 * @param ctxt  a document saving context
 * @param escape  the escaping function
 * @returns 0 if successful or -1 in case of error.
 */
int
xmlSaveSetEscape(xmlSaveCtxt *ctxt, xmlCharEncodingOutputFunc escape)
{
    if (ctxt == NULL) return(-1);
    ctxt->escape = escape;
    return(0);
}

/**
 * Has no effect.
 *
 * @deprecated Don't use.
 *
 * @param ctxt  a document saving context
 * @param escape  the escaping function
 * @returns 0 if successful or -1 in case of error.
 */
int
xmlSaveSetAttrEscape(xmlSaveCtxt *ctxt,
                     xmlCharEncodingOutputFunc escape ATTRIBUTE_UNUSED)
{
    if (ctxt == NULL) return(-1);
    return(0);
}

/************************************************************************
 *									*
 *		Public entry points based on buffers			*
 *									*
 ************************************************************************/

/**
 * Serialize attribute text to an output buffer.
 *
 * @param buf  output buffer
 * @param doc  the document
 * @param string  the text content
 */
void
xmlBufAttrSerializeTxtContent(xmlOutputBuffer *buf, xmlDoc *doc,
                              const xmlChar *string)
{
    int flags = XML_ESCAPE_ATTR;

    if ((doc == NULL) || (doc->encoding == NULL))
        flags |= XML_ESCAPE_NON_ASCII;
    xmlSerializeText(buf, string, SIZE_MAX, flags);
}

/**
 * Serialize attribute text to an xmlBuffer.
 *
 * @param buf  the XML buffer output
 * @param doc  the document
 * @param attr  the attribute node
 * @param string  the text content
 */
void
xmlAttrSerializeTxtContent(xmlBuffer *buf, xmlDoc *doc,
                           xmlAttr *attr ATTRIBUTE_UNUSED,
                           const xmlChar *string)
{
    xmlOutputBufferPtr out;

    if ((buf == NULL) || (string == NULL))
        return;
    out = xmlOutputBufferCreateBuffer(buf, NULL);
    xmlBufAttrSerializeTxtContent(out, doc, string);
    xmlOutputBufferFlush(out);
    if ((out == NULL) || (out->error))
        xmlFree(xmlBufferDetach(buf));
    xmlOutputBufferClose(out);
}

/**
 * Serialize an XML node to an xmlBuffer.
 *
 * Uses the document's encoding. If the document has no encoding,
 * uses ASCII without an encoding declaration.
 *
 * Note that `format` only works if the document was parsed with
 * XML_PARSE_NOBLANKS.
 *
 * Since this is using xmlBuffer structures it is limited to 2GB and
 * somewhat deprecated, use #xmlNodeDumpOutput instead.
 *
 * @param buf  the XML buffer output
 * @param doc  the document
 * @param cur  the current node
 * @param level  the initial indenting level
 * @param format  is formatting allowed
 * @returns the number of bytes written to the buffer or -1 in case of error
 */
int
xmlNodeDump(xmlBuffer *buf, xmlDoc *doc, xmlNode *cur, int level,
            int format)
{
    xmlBufPtr buffer;
    size_t ret1;
    int ret2;

    if ((buf == NULL) || (cur == NULL))
        return(-1);
    if (level < 0)
        level = 0;
    else if (level > 100)
        level = 100;
    buffer = xmlBufFromBuffer(buf);
    if (buffer == NULL)
        return(-1);
    ret1 = xmlBufNodeDump(buffer, doc, cur, level, format);
    ret2 = xmlBufBackToBuffer(buffer, buf);
    if ((ret1 == (size_t) -1) || (ret2 < 0))
        return(-1);
    return(ret1 > INT_MAX ? INT_MAX : ret1);
}

/**
 * Serialize an XML node to an xmlBuf.
 *
 * Uses the document's encoding. If the document has no encoding,
 * uses ASCII without an encoding declaration.
 *
 * Note that `format` only works if the document was parsed with
 * XML_PARSE_NOBLANKS.
 *
 * @param buf  the XML buffer output
 * @param doc  the document
 * @param cur  the current node
 * @param level  the imbrication level for indenting
 * @param format  is formatting allowed
 * @returns the number of bytes written to the buffer, in case of error 0
 *     is returned or `buf` stores the error
 */

size_t
xmlBufNodeDump(xmlBuf *buf, xmlDoc *doc, xmlNode *cur, int level,
            int format)
{
    size_t use;
    size_t ret;
    xmlOutputBufferPtr outbuf;

    xmlInitParser();

    if (cur == NULL) {
        return ((size_t) -1);
    }
    if (buf == NULL) {
        return ((size_t) -1);
    }
    outbuf = (xmlOutputBufferPtr) xmlMalloc(sizeof(xmlOutputBuffer));
    if (outbuf == NULL) {
        xmlSaveErrMemory(NULL);
        return ((size_t) -1);
    }
    memset(outbuf, 0, (size_t) sizeof(xmlOutputBuffer));
    outbuf->buffer = buf;
    outbuf->encoder = NULL;
    outbuf->writecallback = NULL;
    outbuf->closecallback = NULL;
    outbuf->context = NULL;
    outbuf->written = 0;

    use = xmlBufUse(buf);
    xmlNodeDumpOutput(outbuf, doc, cur, level, format, NULL);
    if (outbuf->error)
        ret = (size_t) -1;
    else
        ret = xmlBufUse(buf) - use;
    xmlFree(outbuf);
    return (ret);
}

/**
 * Serialize an XML node to a `FILE`.
 *
 * Uses the document's encoding. If the document has no encoding,
 * uses ASCII without an encoding declaration.
 *
 * @param f  the FILE * for the output
 * @param doc  the document
 * @param cur  the current node
 */
void
xmlElemDump(FILE * f, xmlDoc *doc, xmlNode *cur)
{
    xmlOutputBufferPtr outbuf;

    xmlInitParser();

    if (cur == NULL) {
        return;
    }

    outbuf = xmlOutputBufferCreateFile(f, NULL);
    if (outbuf == NULL)
        return;
#ifdef LIBXML_HTML_ENABLED
    if ((doc != NULL) && (doc->type == XML_HTML_DOCUMENT_NODE))
        htmlNodeDumpOutput(outbuf, doc, cur, NULL);
    else
#endif /* LIBXML_HTML_ENABLED */
        xmlNodeDumpOutput(outbuf, doc, cur, 0, 1, NULL);
    xmlOutputBufferClose(outbuf);
}

/************************************************************************
 *									*
 *		Saving functions front-ends				*
 *									*
 ************************************************************************/

/**
 * Serialize an XML node to an output buffer.
 *
 * If `encoding` is NULL, uses the document's encoding. If the
 * document has no encoding, serializes as ASCII without an
 * encoding declaration.
 *
 * Note that `format` only works if the document was parsed with
 * XML_PARSE_NOBLANKS.
 *
 * @param buf  the XML buffer output
 * @param doc  the document
 * @param cur  the current node
 * @param level  the imbrication level for indenting
 * @param format  is formatting allowed
 * @param encoding  an optional encoding string
 */
void
xmlNodeDumpOutput(xmlOutputBuffer *buf, xmlDoc *doc, xmlNode *cur,
                  int level, int format, const char *encoding)
{
    xmlSaveCtxt ctxt;
    int options;
#ifdef LIBXML_HTML_ENABLED
    xmlDtdPtr dtd;
    int is_xhtml = 0;
#endif

    (void) doc;

    xmlInitParser();

    if ((buf == NULL) || (cur == NULL)) return;

    if (level < 0)
        level = 0;
    else if (level > 100)
        level = 100;

    if (encoding == NULL)
        encoding = "UTF-8";

    memset(&ctxt, 0, sizeof(ctxt));
    ctxt.buf = buf;
    ctxt.level = level;
    ctxt.encoding = (const xmlChar *) encoding;

    options = XML_SAVE_AS_XML;
    if (format)
        options |= XML_SAVE_FORMAT;
    xmlSaveCtxtInit(&ctxt, options);

#ifdef LIBXML_HTML_ENABLED
    dtd = xmlGetIntSubset(doc);
    if (dtd != NULL) {
	is_xhtml = xmlIsXHTML(dtd->SystemID, dtd->ExternalID);
	if (is_xhtml < 0)
	    is_xhtml = 0;
    }

    if (is_xhtml)
        xhtmlNodeDumpOutput(&ctxt, cur);
    else
#endif
        xmlNodeDumpOutputInternal(&ctxt, cur);
}

static void
xmlDocDumpInternal(xmlOutputBufferPtr buf, xmlDocPtr doc, const char *encoding,
                   int format) {
    xmlSaveCtxt ctxt;
    int options;

    memset(&ctxt, 0, sizeof(ctxt));
    ctxt.buf = buf;

    if (buf->encoder != NULL) {
        /*
         * Keep original encoding
         */
        encoding = buf->encoder->name;
        ctxt.encoding = BAD_CAST encoding;
    }

    options = XML_SAVE_AS_XML;
    if (format)
        options |= XML_SAVE_FORMAT;
    xmlSaveCtxtInit(&ctxt, options);

    xmlSaveDocInternal(&ctxt, doc, (const xmlChar *) encoding);
}

/**
 * Serialize an XML document to memory.
 *
 * If `encoding` is NULL, uses the document's encoding. If the
 * document has no encoding, serializes as ASCII without an
 * encoding declaration.
 *
 * It is up to the caller of this function to free the returned
 * memory with #xmlFree.
 *
 * Note that `format` only works if the document was parsed with
 * XML_PARSE_NOBLANKS.
 *
 * @param out_doc  Document to generate XML text from
 * @param doc_txt_ptr  Memory pointer for allocated XML text
 * @param doc_txt_len  Length of the generated XML text
 * @param txt_encoding  Character encoding to use when generating XML text
 * @param format  should formatting spaces been added
 */

void
xmlDocDumpFormatMemoryEnc(xmlDoc *out_doc, xmlChar **doc_txt_ptr,
		int * doc_txt_len, const char * txt_encoding,
		int format) {
    xmlOutputBufferPtr buf = NULL;

    if (doc_txt_len != NULL)
        *doc_txt_len = 0;

    if (doc_txt_ptr == NULL)
        return;
    *doc_txt_ptr = NULL;

    if (out_doc == NULL)
        return;

    buf = xmlAllocOutputBuffer(NULL);
    if (buf == NULL) {
        xmlSaveErrMemory(NULL);
        return;
    }

    xmlDocDumpInternal(buf, out_doc, txt_encoding, format);

    xmlOutputBufferFlush(buf);

    if (!buf->error) {
        if (doc_txt_len != NULL)
            *doc_txt_len = xmlBufUse(buf->buffer);
        *doc_txt_ptr = xmlBufDetach(buf->buffer);
    }

    xmlOutputBufferClose(buf);
}

/**
 * Same as #xmlDocDumpFormatMemoryEnc with `encoding` set to
 * NULL and `format` set to 0.
 *
 * @param cur  the document
 * @param mem  OUT: the memory pointer
 * @param size  OUT: the memory length
 */
void
xmlDocDumpMemory(xmlDoc *cur, xmlChar**mem, int *size) {
    xmlDocDumpFormatMemoryEnc(cur, mem, size, NULL, 0);
}

/**
 * Same as #xmlDocDumpFormatMemoryEnc with `encoding` set to
 * NULL.
 *
 * @param cur  the document
 * @param mem  OUT: the memory pointer
 * @param size  OUT: the memory length
 * @param format  should formatting spaces been added
 */
void
xmlDocDumpFormatMemory(xmlDoc *cur, xmlChar**mem, int *size, int format) {
    xmlDocDumpFormatMemoryEnc(cur, mem, size, NULL, format);
}

/**
 * Same as #xmlDocDumpFormatMemoryEnc with `format` set to 0.
 *
 * @param out_doc  Document to generate XML text from
 * @param doc_txt_ptr  Memory pointer for allocated XML text
 * @param doc_txt_len  Length of the generated XML text
 * @param txt_encoding  Character encoding to use when generating XML text
 */

void
xmlDocDumpMemoryEnc(xmlDoc *out_doc, xmlChar **doc_txt_ptr,
	            int * doc_txt_len, const char * txt_encoding) {
    xmlDocDumpFormatMemoryEnc(out_doc, doc_txt_ptr, doc_txt_len,
	                      txt_encoding, 0);
}

/**
 * Serialize an XML document to a `FILE`.
 *
 * Uses the document's encoding. If the document has no encoding,
 * uses ASCII without an encoding declaration.
 *
 * Note that `format` only works if the document was parsed with
 * XML_PARSE_NOBLANKS.
 *
 * @param f  the FILE*
 * @param cur  the document
 * @param format  should formatting spaces been added
 * @returns the number of bytes written or -1 in case of failure.
 */
int
xmlDocFormatDump(FILE *f, xmlDoc *cur, int format) {
    xmlOutputBufferPtr buf;

    if (cur == NULL) {
	return(-1);
    }

    buf = xmlOutputBufferCreateFile(f, NULL);
    if (buf == NULL) return(-1);

    xmlDocDumpInternal(buf, cur, NULL, format);

    return(xmlOutputBufferClose(buf));
}

/**
 * Serialize an XML document to a `FILE`.
 *
 * Uses the document's encoding. If the document has no encoding,
 * uses ASCII without an encoding declaration.
 *
 * @param f  the FILE*
 * @param cur  the document
 * @returns the number of bytes written or -1 in case of failure.
 */
int
xmlDocDump(FILE *f, xmlDoc *cur) {
    return(xmlDocFormatDump (f, cur, 0));
}

/**
 * Same as #xmlSaveFormatFileTo with `format` set to 0.
 *
 * WARNING: This calls #xmlOutputBufferClose and frees `buf`.
 *
 * @param buf  an output I/O buffer
 * @param cur  the document
 * @param encoding  the encoding if any assuming the I/O layer handles the transcoding
 * @returns the number of bytes written or -1 in case of failure.
 */
int
xmlSaveFileTo(xmlOutputBuffer *buf, xmlDoc *cur, const char *encoding) {
    return(xmlSaveFormatFileTo(buf, cur, encoding, 0));
}

/**
 * Serialize an XML document to an output buffer.
 *
 * If the output buffer already uses a (non-default) encoding,
 * `encoding` is ignored. If the output buffer has no encoding
 * and `encoding` is NULL, uses the document's encoding or
 * ASCII without an encoding declaration.
 *
 * Note that `format` only works if the document was parsed with
 * XML_PARSE_NOBLANKS.
 *
 * WARNING: This calls #xmlOutputBufferClose and frees `buf`.
 *
 * @param buf  an output I/O buffer
 * @param cur  the document
 * @param encoding  the encoding if any assuming the I/O layer handles the transcoding
 * @param format  should formatting spaces been added
 * @returns the number of bytes written or -1 in case of failure.
 */
int
xmlSaveFormatFileTo(xmlOutputBuffer *buf, xmlDoc *cur,
                    const char *encoding, int format)
{
    if (buf == NULL) return(-1);
    if ((cur == NULL) ||
        ((cur->type != XML_DOCUMENT_NODE) &&
	 (cur->type != XML_HTML_DOCUMENT_NODE))) {
        xmlOutputBufferClose(buf);
	return(-1);
    }

    xmlDocDumpInternal(buf, cur, encoding, format);

    return(xmlOutputBufferClose(buf));
}

/**
 * Serialize an XML document to a file using the given encoding.
 * If `filename` is `"-"`, stdout is used. This is potentially
 * insecure and might be changed in a future version.
 *
 * If `encoding` is NULL, uses the document's encoding. If the
 * document has no encoding, serializes as ASCII without an
 * encoding declaration.
 *
 * Note that `format` only works if the document was parsed with
 * XML_PARSE_NOBLANKS.
 *
 * @param filename  the filename or URL to output
 * @param cur  the document being saved
 * @param encoding  the name of the encoding to use or NULL.
 * @param format  should formatting spaces be added.
 * @returns the number of bytes written or -1 in case of error.
 */
int
xmlSaveFormatFileEnc( const char * filename, xmlDoc *cur,
			const char * encoding, int format ) {
    xmlOutputBufferPtr buf;

    if (cur == NULL)
	return(-1);

#ifdef LIBXML_ZLIB_ENABLED
    if (cur->compression < 0) cur->compression = xmlGetCompressMode();
#endif
    /*
     * save the content to a temp buffer.
     */
    buf = xmlOutputBufferCreateFilename(filename, NULL, cur->compression);
    if (buf == NULL) return(-1);

    xmlDocDumpInternal(buf, cur, encoding, format);

    return(xmlOutputBufferClose(buf));
}


/**
 * Same as #xmlSaveFormatFileEnc with `format` set to 0.
 *
 * @param filename  the filename (or URL)
 * @param cur  the document
 * @param encoding  the name of an encoding (or NULL)
 * @returns the number of bytes written or -1 in case of failure.
 */
int
xmlSaveFileEnc(const char *filename, xmlDoc *cur, const char *encoding) {
    return ( xmlSaveFormatFileEnc( filename, cur, encoding, 0 ) );
}

/**
 * Same as #xmlSaveFormatFileEnc with `encoding` set to NULL.
 *
 * @param filename  the filename (or URL)
 * @param cur  the document
 * @param format  should formatting spaces been added
 * @returns the number of bytes written or -1 in case of failure.
 */
int
xmlSaveFormatFile(const char *filename, xmlDoc *cur, int format) {
    return ( xmlSaveFormatFileEnc( filename, cur, NULL, format ) );
}

/**
 * Same as #xmlSaveFormatFileEnc with `encoding` set to NULL
 * and `format` set to 0.
 *
 * @param filename  the filename (or URL)
 * @param cur  the document
 * @returns the number of bytes written or -1 in case of failure.
 */
int
xmlSaveFile(const char *filename, xmlDoc *cur) {
    return(xmlSaveFormatFileEnc(filename, cur, NULL, 0));
}

#endif /* LIBXML_OUTPUT_ENABLED */