element.c

电驴下载工具eMule0.47aVeryCD的源代码,可作分析测试也可用于P2P软件的开发研究.

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000-2003 Intel Corporation 
// All rights reserved. 
//
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions are met: 
//
// * Redistributions of source code must retain the above copyright notice, 
// this list of conditions and the following disclaimer. 
// * Redistributions in binary form must reproduce the above copyright notice, 
// this list of conditions and the following disclaimer in the documentation 
// and/or other materials provided with the distribution. 
// * Neither name of Intel Corporation nor the names of its contributors 
// may be used to endorse or promote products derived from this software 
// without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR 
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////

#include "ixmlparser.h"

/*================================================================
*   ixmlElement_Init
*       Initializes an element node.
*       External function.
*
*=================================================================*/
void
ixmlElement_init( IN IXML_Element * element )
{
    if( element != NULL ) {
        memset( element, 0, sizeof( IXML_Element ) );
    }
}

/*================================================================
*   ixmlElement_getTagName
*       Gets the element node's tagName
*       External function.
*
*=================================================================*/
const DOMString
ixmlElement_getTagName( IN IXML_Element * element )
{

    if( element != NULL ) {
        return element->tagName;
    } else {
        return NULL;
    }
}

/*================================================================
*   ixmlElement_setTagName
*       Sets the given element's tagName.
*   Parameters:
*       tagName: new tagName for the element.
*
*=================================================================*/
int
ixmlElement_setTagName( IN IXML_Element * element,
                        IN char *tagName )
{
    int rc = IXML_SUCCESS;

    assert( ( element != NULL ) && ( tagName != NULL ) );
    if( ( element == NULL ) || ( tagName == NULL ) ) {
        return IXML_FAILED;
    }

    if( element->tagName != NULL ) {
        free( element->tagName );
    }

    element->tagName = strdup( tagName );
    if( element->tagName == NULL ) {
        rc = IXML_INSUFFICIENT_MEMORY;
    }

    return rc;

}

/*================================================================
*   ixmlElement_getAttribute
*       Retrievea an attribute value by name.
*       External function.
*   Parameters:
*       name: the name of the attribute to retrieve.
*   Return Values:
*       attribute value as a string, or the empty string if that attribute
*       does not have a specified value.
*
*=================================================================*/
DOMString
ixmlElement_getAttribute( IN IXML_Element * element,
                          IN DOMString name )
{
    IXML_Node *attrNode;

    if( ( element == NULL ) || ( name == NULL ) ) {
        return NULL;
    }

    attrNode = element->n.firstAttr;
    while( attrNode != NULL ) {
        if( strcmp( attrNode->nodeName, name ) == 0 ) { // found it
            return attrNode->nodeValue;
        } else {
            attrNode = attrNode->nextSibling;
        }
    }

    return NULL;
}

/*================================================================
*   ixmlElement_setAttribute
*       Adds a new attribute.  If an attribute with that name is already
*       present in the element, its value is changed to be that of the value
*       parameter. If not, a new attribute is inserted into the element.
*
*       External function.
*   Parameters:
*       name: the name of the attribute to create or alter.
*       value: value to set in string form
*   Return Values:
*       IXML_SUCCESS or failure code.    
*
*=================================================================*/
int
ixmlElement_setAttribute( IN IXML_Element * element,
                          IN char *name,
                          IN char *value )
{
    IXML_Node *attrNode;
    IXML_Attr *newAttrNode;
    short errCode = IXML_SUCCESS;

    if( ( element == NULL ) || ( name == NULL ) || ( value == NULL ) ) {
        errCode = IXML_INVALID_PARAMETER;
        goto ErrorHandler;
    }

    if( Parser_isValidXmlName( name ) == FALSE ) {
        errCode = IXML_INVALID_CHARACTER_ERR;
        goto ErrorHandler;
    }

    attrNode = element->n.firstAttr;
    while( attrNode != NULL ) {
        if( strcmp( attrNode->nodeName, name ) == 0 ) {
            break;              //found it
        } else {
            attrNode = attrNode->nextSibling;
        }
    }

    if( attrNode == NULL ) {    // add a new attribute
        errCode =
            ixmlDocument_createAttributeEx( ( IXML_Document * ) element->n.
                                            ownerDocument, name,
                                            &newAttrNode );
        if( errCode != IXML_SUCCESS ) {
            goto ErrorHandler;
        }

        attrNode = ( IXML_Node * ) newAttrNode;

        attrNode->nodeValue = strdup( value );
        if( attrNode->nodeValue == NULL ) {
            ixmlAttr_free( newAttrNode );
            errCode = IXML_INSUFFICIENT_MEMORY;
            goto ErrorHandler;
        }

        errCode =
            ixmlElement_setAttributeNode( element, newAttrNode, NULL );
        if( errCode != IXML_SUCCESS ) {
            ixmlAttr_free( newAttrNode );
            goto ErrorHandler;
        }

    } else {
        if( attrNode->nodeValue != NULL ) { // attribute name has a value already
            free( attrNode->nodeValue );
        }

        attrNode->nodeValue = strdup( value );
        if( attrNode->nodeValue == NULL ) {
            errCode = IXML_INSUFFICIENT_MEMORY;
        }
    }

  ErrorHandler:
    return errCode;
}

/*================================================================
*   ixmlElement_removeAttribute
*       Removes an attribute value by name. The attribute node is
*       not removed.
*       External function.
*   Parameters:
*       name: the name of the attribute to remove.
*   Return Values:
*       IXML_SUCCESS or error code.
*
*=================================================================*/
int
ixmlElement_removeAttribute( IN IXML_Element * element,
                             IN char *name )
{

    IXML_Node *attrNode;

    if( ( element == NULL ) || ( name == NULL ) ) {
        return IXML_INVALID_PARAMETER;
    }

    attrNode = element->n.firstAttr;
    while( attrNode != NULL ) {
        if( strcmp( attrNode->nodeName, name ) == 0 ) {
            break;              //found it
        } else {
            attrNode = attrNode->nextSibling;
        }
    }

    if( attrNode != NULL ) {    // has the attribute
        if( attrNode->nodeValue != NULL ) {
            free( attrNode->nodeValue );
            attrNode->nodeValue = NULL;
        }
    }

    return IXML_SUCCESS;
}

/*================================================================
*   ixmlElement_getAttributeNode
*       Retrieve an attribute node by name.
*       External function.        
*   Parameters:
*       name: the name(nodeName) of the attribute to retrieve.
*   Return Value:
*       The attr node with the specified name (nodeName) or NULL if
*       there is no such attribute.  
*
*=================================================================*/
IXML_Attr *
ixmlElement_getAttributeNode( IN IXML_Element * element,
                              IN char *name )
{

    IXML_Node *attrNode;

    if( ( element == NULL ) || ( name == NULL ) ) {
        return NULL;
    }

    attrNode = element->n.firstAttr;
    while( attrNode != NULL ) {
        if( strcmp( attrNode->nodeName, name ) == 0 ) { // found it
            break;
        } else {
            attrNode = attrNode->nextSibling;
        }
    }

    return ( IXML_Attr * ) attrNode;

}

/*================================================================
*   ixmlElement_setAttributeNode
*       Adds a new attribute node.  If an attribute with that name(nodeName)
*       is already present in the element, it is replaced by the new one.
*       External function.
*   Parameters:
*       The attr node to add to the attribute list.
*   Return Value:
*       if newAttr replaces an existing attribute, the replaced
*       attr node is returned, otherwise NULL is returned.           
*
*=================================================================*/
int
ixmlElement_setAttributeNode( IN IXML_Element * element,
                              IN IXML_Attr * newAttr,
                              OUT IXML_Attr ** rtAttr )
{

    IXML_Node *attrNode;
    IXML_Node *node;
    IXML_Node *nextAttr = NULL;
    IXML_Node *prevAttr = NULL;
    IXML_Node *preSib,
     *nextSib;

    if( ( element == NULL ) || ( newAttr == NULL ) ) {
        return IXML_INVALID_PARAMETER;
    }

    if( newAttr->n.ownerDocument != element->n.ownerDocument ) {
        return IXML_WRONG_DOCUMENT_ERR;
    }

    if( newAttr->ownerElement != NULL ) {
        return IXML_INUSE_ATTRIBUTE_ERR;
    }

    newAttr->ownerElement = element;