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virtualbox/include/iprt/cpp/xml.h
Daniel Baumann df1bda4fe9
Adding upstream version 7.0.20-dfsg. 
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
2025-06-22 09:56:04 +02:00

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/** @file
* IPRT - XML Helper APIs.
*/
/*
* Copyright (C) 2007-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef IPRT_INCLUDED_cpp_xml_h
#define IPRT_INCLUDED_cpp_xml_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#ifndef IN_RING3
# error "There are no XML APIs available in Ring-0 Context!"
#endif
#ifdef IPRT_NO_CRT
# error "Not available in no-CRT mode because it depends on exceptions, std::list, std::map and stdio.h."
#endif
#include <iprt/list.h>
#include <iprt/cpp/exception.h>
#include <iprt/cpp/utils.h>
#include <list>
#include <memory>
/** @defgroup grp_rt_cpp_xml C++ XML support
* @ingroup grp_rt_cpp
* @{
*/
/* Forwards */
typedef struct _xmlParserInput xmlParserInput;
typedef xmlParserInput *xmlParserInputPtr;
typedef struct _xmlParserCtxt xmlParserCtxt;
typedef xmlParserCtxt *xmlParserCtxtPtr;
typedef struct _xmlError xmlError;
typedef xmlError *xmlErrorPtr;
typedef struct _xmlAttr xmlAttr;
typedef struct _xmlNode xmlNode;
#define RT_XML_CONTENT_SMALL _8K
#define RT_XML_CONTENT_LARGE _128K
#define RT_XML_ATTR_TINY 64
#define RT_XML_ATTR_SMALL _1K
#define RT_XML_ATTR_MEDIUM _8K
#define RT_XML_ATTR_LARGE _64K
/** @} */
namespace xml
{
/**
* @addtogroup grp_rt_cpp_xml
* @{
*/
// Exceptions
//////////////////////////////////////////////////////////////////////////////
class RT_DECL_CLASS LogicError : public RTCError
{
public:
LogicError(const char *aMsg = NULL)
: RTCError(aMsg)
{}
LogicError(RT_SRC_POS_DECL);
};
class RT_DECL_CLASS RuntimeError : public RTCError
{
public:
RuntimeError(const char *aMsg = NULL)
: RTCError(aMsg)
{}
};
class RT_DECL_CLASS XmlError : public RuntimeError
{
public:
XmlError(xmlErrorPtr aErr);
static char* Format(xmlErrorPtr aErr);
};
// Logical errors
//////////////////////////////////////////////////////////////////////////////
class RT_DECL_CLASS ENotImplemented : public LogicError
{
public:
ENotImplemented(const char *aMsg = NULL) : LogicError(aMsg) {}
ENotImplemented(RT_SRC_POS_DECL) : LogicError(RT_SRC_POS_ARGS) {}
};
class RT_DECL_CLASS EInvalidArg : public LogicError
{
public:
EInvalidArg(const char *aMsg = NULL) : LogicError(aMsg) {}
EInvalidArg(RT_SRC_POS_DECL) : LogicError(RT_SRC_POS_ARGS) {}
};
class RT_DECL_CLASS EDocumentNotEmpty : public LogicError
{
public:
EDocumentNotEmpty(const char *aMsg = NULL) : LogicError(aMsg) {}
EDocumentNotEmpty(RT_SRC_POS_DECL) : LogicError(RT_SRC_POS_ARGS) {}
};
class RT_DECL_CLASS ENodeIsNotElement : public LogicError
{
public:
ENodeIsNotElement(const char *aMsg = NULL) : LogicError(aMsg) {}
ENodeIsNotElement(RT_SRC_POS_DECL) : LogicError(RT_SRC_POS_ARGS) {}
};
// Runtime errors
//////////////////////////////////////////////////////////////////////////////
class RT_DECL_CLASS EIPRTFailure : public RuntimeError
{
public:
EIPRTFailure(int aRC, const char *pszContextFmt, ...);
int rc() const
{
return mRC;
}
int getStatus() const
{
return mRC;
}
private:
int mRC;
};
/**
* The Stream class is a base class for I/O streams.
*/
class RT_DECL_CLASS Stream
{
public:
virtual ~Stream() {}
virtual const char *uri() const = 0;
/**
* Returns the current read/write position in the stream. The returned
* position is a zero-based byte offset from the beginning of the file.
*
* Throws ENotImplemented if this operation is not implemented for the
* given stream.
*/
virtual uint64_t pos() const = 0;
/**
* Sets the current read/write position in the stream.
*
* @param aPos Zero-based byte offset from the beginning of the stream.
*
* Throws ENotImplemented if this operation is not implemented for the
* given stream.
*/
virtual void setPos (uint64_t aPos) = 0;
};
/**
* The Input class represents an input stream.
*
* This input stream is used to read the settings tree from.
* This is an abstract class that must be subclassed in order to fill it with
* useful functionality.
*/
class RT_DECL_CLASS Input : virtual public Stream
{
public:
/**
* Reads from the stream to the supplied buffer.
*
* @param aBuf Buffer to store read data to.
* @param aLen Buffer length.
*
* @return Number of bytes read.
*/
virtual int read (char *aBuf, int aLen) = 0;
};
/**
*
*/
class RT_DECL_CLASS Output : virtual public Stream
{
public:
/**
* Writes to the stream from the supplied buffer.
*
* @param aBuf Buffer to write data from.
* @param aLen Buffer length.
*
* @return Number of bytes written.
*/
virtual int write (const char *aBuf, int aLen) = 0;
/**
* Truncates the stream from the current position and upto the end.
* The new file size will become exactly #pos() bytes.
*
* Throws ENotImplemented if this operation is not implemented for the
* given stream.
*/
virtual void truncate() = 0;
};
//////////////////////////////////////////////////////////////////////////////
/**
* The File class is a stream implementation that reads from and writes to
* regular files.
*
* The File class uses IPRT File API for file operations. Note that IPRT File
* API is not thread-safe. This means that if you pass the same RTFILE handle to
* different File instances that may be simultaneously used on different
* threads, you should care about serialization; otherwise you will get garbage
* when reading from or writing to such File instances.
*/
class RT_DECL_CLASS File : public Input, public Output
{
public:
/**
* Possible file access modes.
*/
enum Mode { Mode_Read, Mode_WriteCreate, Mode_Overwrite, Mode_ReadWrite };
/**
* Opens a file with the given name in the given mode. If @a aMode is Read
* or ReadWrite, the file must exist. If @a aMode is Write, the file must
* not exist. Otherwise, an EIPRTFailure exception will be thrown.
*
* @param aMode File mode.
* @param aFileName File name.
* @param aFlushIt Whether to flush a writable file before closing it.
*/
File(Mode aMode, const char *aFileName, bool aFlushIt = false);
/**
* Uses the given file handle to perform file operations. This file
* handle must be already open in necessary mode (read, or write, or mixed).
*
* The read/write position of the given handle will be reset to the
* beginning of the file on success.
*
* Note that the given file handle will not be automatically closed upon
* this object destruction.
*
* @note It you pass the same RTFILE handle to more than one File instance,
* please make sure you have provided serialization in case if these
* instasnces are to be simultaneously used by different threads.
* Otherwise you may get garbage when reading or writing.
*
* @param aHandle Open file handle.
* @param aFileName File name (for reference).
* @param aFlushIt Whether to flush a writable file before closing it.
*/
File(RTFILE aHandle, const char *aFileName = NULL, bool aFlushIt = false);
/**
* Destroys the File object. If the object was created from a file name
* the corresponding file will be automatically closed. If the object was
* created from a file handle, it will remain open.
*/
virtual ~File();
const char *uri() const;
uint64_t pos() const;
void setPos(uint64_t aPos);
/**
* See Input::read(). If this method is called in wrong file mode,
* LogicError will be thrown.
*/
int read(char *aBuf, int aLen);
/**
* See Output::write(). If this method is called in wrong file mode,
* LogicError will be thrown.
*/
int write(const char *aBuf, int aLen);
/**
* See Output::truncate(). If this method is called in wrong file mode,
* LogicError will be thrown.
*/
void truncate();
private:
/* Obscure class data */
struct Data;
Data *m;
/* auto_ptr data doesn't have proper copy semantics */
DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(File);
};
/**
* The MemoryBuf class represents a stream implementation that reads from the
* memory buffer.
*/
class RT_DECL_CLASS MemoryBuf : public Input
{
public:
MemoryBuf (const char *aBuf, size_t aLen, const char *aURI = NULL);
virtual ~MemoryBuf();
const char *uri() const;
int read(char *aBuf, int aLen);
uint64_t pos() const;
void setPos(uint64_t aPos);
private:
/* Obscure class data */
struct Data;
Data *m;
/* auto_ptr data doesn't have proper copy semantics */
DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(MemoryBuf);
};
/*
* GlobalLock
*
*
*/
typedef DECLCALLBACKTYPE_EX(xmlParserInput *, RT_NOTHING, FNEXTERNALENTITYLOADER,(const char *aURI, const char *aID,
xmlParserCtxt *aCtxt));
typedef FNEXTERNALENTITYLOADER *PFNEXTERNALENTITYLOADER; /**< xmlExternalEntityLoader w/ noexcept. */
class RT_DECL_CLASS GlobalLock
{
public:
GlobalLock();
~GlobalLock();
void setExternalEntityLoader(PFNEXTERNALENTITYLOADER pFunc);
static xmlParserInput* callDefaultLoader(const char *aURI,
const char *aID,
xmlParserCtxt *aCtxt);
private:
/* Obscure class data. */
struct Data;
struct Data *m;
};
class ElementNode;
typedef std::list<const ElementNode*> ElementNodesList;
class AttributeNode;
class ContentNode;
/**
* Node base class.
*
* Cannot be used directly, but ElementNode, ContentNode and AttributeNode
* derive from this. This does implement useful public methods though.
*
*
*/
class RT_DECL_CLASS Node
{
public:
virtual ~Node();
const char *getName() const;
const char *getPrefix() const;
const char *getNamespaceURI() const;
bool nameEqualsNS(const char *pcszNamespace, const char *pcsz) const;
bool nameEquals(const char *pcsz) const
{
return nameEqualsNS(NULL, pcsz);
}
bool nameEqualsN(const char *pcsz, size_t cchMax, const char *pcszNamespace = NULL) const;
const char *getValue() const;
const char *getValueN(size_t cchValueLimit) const;
bool copyValue(int32_t &i) const;
bool copyValue(uint32_t &i) const;
bool copyValue(int64_t &i) const;
bool copyValue(uint64_t &i) const;
/** @name Introspection.
* @{ */
/** Is this an ElementNode instance.
* @returns true / false */
bool isElement() const
{
return m_Type == IsElement;
}
/** Is this an ContentNode instance.
* @returns true / false */
bool isContent() const
{
return m_Type == IsContent;
}
/** Is this an AttributeNode instance.
* @returns true / false */
bool isAttribute() const
{
return m_Type == IsAttribute;
}
int getLineNumber() const;
/** @} */
/** @name General tree enumeration.
*
* Use the introspection methods isElement() and isContent() before doing static
* casting. Parents are always or ElementNode type, but siblings and children
* can be of both ContentNode and ElementNode types.
*
* @remarks Attribute node are in the attributes list, while both content and
* element nodes are in the list of children. See ElementNode.
*
* @remarks Careful mixing tree walking with node removal!
* @{
*/
/** Get the parent node
* @returns Pointer to the parent node, or NULL if root. */
const Node *getParent() const
{
return m_pParent;
}
/** Get the previous sibling.
* @returns Pointer to the previous sibling node, NULL if first child.
*/
const Node *getPrevSibiling() const
{
if (!m_pParentListAnchor)
return NULL;
return RTListGetPrevCpp(m_pParentListAnchor, this, const Node, m_listEntry);
}
/** Get the next sibling.
* @returns Pointer to the next sibling node, NULL if last child. */
const Node *getNextSibiling() const
{
if (!m_pParentListAnchor)
return NULL;
return RTListGetNextCpp(m_pParentListAnchor, this, const Node, m_listEntry);
}
/** @} */
protected:
/** Node types. */
typedef enum { IsElement, IsAttribute, IsContent } EnumType;
/** The type of node this is an instance of. */
EnumType m_Type;
/** The parent node (always an element), NULL if root. */
Node *m_pParent;
xmlNode *m_pLibNode; ///< != NULL if this is an element or content node
xmlAttr *m_pLibAttr; ///< != NULL if this is an attribute node
const char *m_pcszNamespacePrefix; ///< not always set
const char *m_pcszNamespaceHref; ///< full http:// spec
const char *m_pcszName; ///< element or attribute name, points either into pLibNode or pLibAttr;
///< NULL if this is a content node
/** Child list entry of this node. (List head m_pParent->m_children or
* m_pParent->m_attribute depending on the type.) */
RTLISTNODE m_listEntry;
/** Pointer to the parent list anchor.
* This allows us to use m_listEntry both for children and attributes. */
PRTLISTANCHOR m_pParentListAnchor;
// hide the default constructor so people use only our factory methods
Node(EnumType type,
Node *pParent,
PRTLISTANCHOR pListAnchor,
xmlNode *pLibNode,
xmlAttr *pLibAttr);
Node(const Node &x); // no copying
friend class AttributeNode;
friend class ElementNode; /* C list hack. */
};
/**
* Node subclass that represents an attribute of an element.
*
* For attributes, Node::getName() returns the attribute name, and Node::getValue()
* returns the attribute value, if any.
*
* Since the Node constructor is private, one can create new attribute nodes
* only through the following factory methods:
*
* -- ElementNode::setAttribute()
*/
class RT_DECL_CLASS AttributeNode : public Node
{
public:
protected:
// hide the default constructor so people use only our factory methods
AttributeNode(const ElementNode *pElmRoot,
Node *pParent,
PRTLISTANCHOR pListAnchor,
xmlAttr *pLibAttr);
AttributeNode(const AttributeNode &x); // no copying
friend class Node;
friend class ElementNode;
};
/**
* Node subclass that represents an element.
*
* For elements, Node::getName() returns the element name, and Node::getValue()
* returns the text contents, if any.
*
* Since the Node constructor is private, one can create element nodes
* only through the following factory methods:
*
* -- Document::createRootElement()
* -- ElementNode::createChild()
*/
class RT_DECL_CLASS ElementNode : public Node
{
public:
int getChildElements(ElementNodesList &children, const char *pcszMatch = NULL) const;
const ElementNode *findChildElementNS(const char *pcszNamespace, const char *pcszMatch) const;
const ElementNode *findChildElement(const char *pcszMatch) const
{
return findChildElementNS(NULL, pcszMatch);
}
const ElementNode *findChildElementFromId(const char *pcszId) const;
/** Finds the first decendant matching the name at the end of @a pcszPath and
* optionally namespace.
*
* @returns Pointer to the child string value, NULL if not found or no value.
* @param pcszPath Path to the child element. Slashes can be used to
* make a simple path to any decendant.
* @param pcszNamespace The namespace to match, NULL (default) match any
* namespace. When using a path, this matches all
* elements along the way.
* @see findChildElement, findChildElementP
*/
const ElementNode *findChildElementP(const char *pcszPath, const char *pcszNamespace = NULL) const;
/** Finds the first child with matching the give name and optionally namspace,
* returning its value.
*
* @returns Pointer to the child string value, NULL if not found or no value.
* @param pcszPath Path to the child element. Slashes can be used to
* make a simple path to any decendant.
* @param pcszNamespace The namespace to match, NULL (default) match any
* namespace. When using a path, this matches all
* elements along the way.
* @see findChildElement, findChildElementP
*/
const char *findChildElementValueP(const char *pcszPath, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
if (pElem)
return pElem->getValue();
return NULL;
}
/** Finds the first child with matching the give name and optionally namspace,
* returning its value. Checks the length against the limit.
*
* @returns Pointer to the child string value, NULL if not found or no value.
* @param pcszPath Path to the child element. Slashes can be used to
* make a simple path to any decendant.
* @param cchValueLimit If the length of the returned value exceeds this
* limit a EIPRTFailure exception will be thrown.
* @param pcszNamespace The namespace to match, NULL (default) match any
* namespace. When using a path, this matches all
* elements along the way.
* @see findChildElement, findChildElementP
*/
const char *findChildElementValuePN(const char *pcszPath, size_t cchValueLimit, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
if (pElem)
return pElem->getValueN(cchValueLimit);
return NULL;
}
/** Combines findChildElementNS and findAttributeValue.
*
* @returns Pointer to attribute string value, NULL if either the element or
* the attribute was not found.
* @param pcszChild The child element name.
* @param pcszAttribute The attribute name.
* @param pcszChildNamespace The namespace to match @a pcszChild with, NULL
* (default) match any namespace.
* @param pcszAttributeNamespace The namespace prefix to apply to the
* attribute, NULL (default) match any namespace.
* @see findChildElementNS and findAttributeValue
* @note The findChildElementAttributeValueP() method would do the same thing
* given the same inputs, but it would be slightly slower, thus the
* separate method.
*/
const char *findChildElementAttributeValue(const char *pcszChild, const char *pcszAttribute,
const char *pcszChildNamespace = NULL,
const char *pcszAttributeNamespace = NULL) const
{
const ElementNode *pElem = findChildElementNS(pcszChildNamespace, pcszChild);
if (pElem)
return pElem->findAttributeValue(pcszAttribute, pcszAttributeNamespace);
return NULL;
}
/** Combines findChildElementP and findAttributeValue.
*
* @returns Pointer to attribute string value, NULL if either the element or
* the attribute was not found.
* @param pcszPath Path to the child element. Slashes can be used
* to make a simple path to any decendant.
* @param pcszAttribute The attribute name.
* @param pcszPathNamespace The namespace to match @a pcszPath with, NULL
* (default) match any namespace. When using a
* path, this matches all elements along the way.
* @param pcszAttributeNamespace The namespace prefix to apply to the
* attribute, NULL (default) match any namespace.
* @see findChildElementP and findAttributeValue
*/
const char *findChildElementAttributeValueP(const char *pcszPath, const char *pcszAttribute,
const char *pcszPathNamespace = NULL,
const char *pcszAttributeNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszPathNamespace);
if (pElem)
return pElem->findAttributeValue(pcszAttribute, pcszAttributeNamespace);
return NULL;
}
/** Combines findChildElementP and findAttributeValueN.
*
* @returns Pointer to attribute string value, NULL if either the element or
* the attribute was not found.
* @param pcszPath The attribute name. Slashes can be used to make a
* simple path to any decendant.
* @param pcszAttribute The attribute name.
* @param cchValueLimit If the length of the returned value exceeds this
* limit a EIPRTFailure exception will be thrown.
* @param pcszPathNamespace The namespace to match @a pcszPath with, NULL
* (default) match any namespace. When using a
* path, this matches all elements along the way.
* @param pcszAttributeNamespace The namespace prefix to apply to the
* attribute, NULL (default) match any namespace.
* @see findChildElementP and findAttributeValue
*/
const char *findChildElementAttributeValuePN(const char *pcszPath, const char *pcszAttribute,
size_t cchValueLimit,
const char *pcszPathNamespace = NULL,
const char *pcszAttributeNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszPathNamespace);
if (pElem)
return pElem->findAttributeValueN(pcszAttribute, cchValueLimit, pcszAttributeNamespace);
return NULL;
}
/** @name Tree enumeration.
* @{ */
/** Get the next tree element in a full tree enumeration.
*
* By starting with the root node, this can be used to enumerate the entire tree
* (or sub-tree if @a pElmRoot is used).
*
* @returns Pointer to the next element in the tree, NULL if we're done.
* @param pElmRoot The root of the tree we're enumerating. NULL if
* it's the entire tree.
*/
ElementNode const *getNextTreeElement(ElementNode const *pElmRoot = NULL) const;
RT_CPP_GETTER_UNCONST_RET(ElementNode *, ElementNode, getNextTreeElement, (const ElementNode *pElmRoot = NULL), (pElmRoot))
/** Get the first child node.
* @returns Pointer to the first child node, NULL if no children. */
const Node *getFirstChild() const
{
return RTListGetFirstCpp(&m_children, const Node, m_listEntry);
}
RT_CPP_GETTER_UNCONST_RET(Node *, ElementNode, getFirstChild,(),())
/** Get the last child node.
* @returns Pointer to the last child node, NULL if no children. */
const Node *getLastChild() const
{
return RTListGetLastCpp(&m_children, const Node, m_listEntry);
}
/** Get the first child node.
* @returns Pointer to the first child node, NULL if no children. */
const ElementNode *getFirstChildElement() const;
/** Get the last child node.
* @returns Pointer to the last child node, NULL if no children. */
const ElementNode *getLastChildElement() const;
/** Get the previous sibling element.
* @returns Pointer to the previous sibling element, NULL if first child
* element.
* @see getNextSibilingElement, getPrevSibling
*/
const ElementNode *getPrevSibilingElement() const;
/** Get the next sibling element.
* @returns Pointer to the next sibling element, NULL if last child element.
* @see getPrevSibilingElement, getNextSibling
*/
const ElementNode *getNextSibilingElement() const;
/** Find the previous element matching the given name and namespace (optionally).
* @returns Pointer to the previous sibling element, NULL if first child
* element.
* @param pcszName The element name to match.
* @param pcszNamespace The namespace name, default is NULL which means
* anything goes.
* @note Changed the order of the arguments.
*/
const ElementNode *findPrevSibilingElement(const char *pcszName, const char *pcszNamespace = NULL) const;
/** Find the next element matching the given name and namespace (optionally).
* @returns Pointer to the previous sibling element, NULL if first child
* element.
* @param pcszName The element name to match.
* @param pcszNamespace The namespace name, default is NULL which means
* anything goes.
* @note Changed the order of the arguments.
*/
const ElementNode *findNextSibilingElement(const char *pcszName, const char *pcszNamespace = NULL) const;
/** @} */
/** @name Attribute enumeration
* @{ */
/** Get the first attribute node.
* @returns Pointer to the first child node, NULL if no attributes. */
const AttributeNode *getFirstAttribute() const
{
return RTListGetFirstCpp(&m_attributes, const AttributeNode, m_listEntry);
}
/** Get the last attribute node.
* @returns Pointer to the last child node, NULL if no attributes. */
const AttributeNode *getLastAttribute() const
{
return RTListGetLastCpp(&m_attributes, const AttributeNode, m_listEntry);
}
/** @} */
const AttributeNode *findAttribute(const char *pcszMatch, const char *pcszNamespace = NULL) const;
/** Find the first attribute with the given name, returning its value string.
* @returns Pointer to the attribute string value.
* @param pcszName The attribute name.
* @param pcszNamespace The namespace name, default is NULL which means
* anything goes.
* @see getAttributeValue
*/
const char *findAttributeValue(const char *pcszName, const char *pcszNamespace = NULL) const
{
const AttributeNode *pAttr = findAttribute(pcszName, pcszNamespace);
if (pAttr)
return pAttr->getValue();
return NULL;
}
/** Find the first attribute with the given name, returning its value string.
* @returns Pointer to the attribute string value.
* @param pcszName The attribute name.
* @param cchValueLimit If the length of the returned value exceeds this
* limit a EIPRTFailure exception will be thrown.
* @param pcszNamespace The namespace name, default is NULL which means
* anything goes.
* @see getAttributeValue
*/
const char *findAttributeValueN(const char *pcszName, size_t cchValueLimit, const char *pcszNamespace = NULL) const
{
const AttributeNode *pAttr = findAttribute(pcszName, pcszNamespace);
if (pAttr)
return pAttr->getValueN(cchValueLimit);
return NULL;
}
bool getAttributeValue(const char *pcszMatch, const char *&pcsz, const char *pcszNamespace = NULL) const
{ return getAttributeValue(pcszMatch, &pcsz, pcszNamespace); }
bool getAttributeValue(const char *pcszMatch, RTCString &str, const char *pcszNamespace = NULL) const
{ return getAttributeValue(pcszMatch, &str, pcszNamespace); }
bool getAttributeValuePath(const char *pcszMatch, RTCString &str, const char *pcszNamespace = NULL) const
{ return getAttributeValue(pcszMatch, &str, pcszNamespace); }
bool getAttributeValue(const char *pcszMatch, int32_t &i, const char *pcszNamespace = NULL) const
{ return getAttributeValue(pcszMatch, &i, pcszNamespace); }
bool getAttributeValue(const char *pcszMatch, uint32_t &i, const char *pcszNamespace = NULL) const
{ return getAttributeValue(pcszMatch, &i, pcszNamespace); }
bool getAttributeValue(const char *pcszMatch, int64_t &i, const char *pcszNamespace = NULL) const
{ return getAttributeValue(pcszMatch, &i, pcszNamespace); }
bool getAttributeValue(const char *pcszMatch, uint64_t &u, const char *pcszNamespace = NULL) const
{ return getAttributeValue(pcszMatch, &u, pcszNamespace); }
bool getAttributeValue(const char *pcszMatch, bool &f, const char *pcszNamespace = NULL) const
{ return getAttributeValue(pcszMatch, &f, pcszNamespace); }
bool getAttributeValueN(const char *pcszMatch, const char *&pcsz, size_t cchValueLimit, const char *pcszNamespace = NULL) const
{ return getAttributeValueN(pcszMatch, &pcsz, cchValueLimit, pcszNamespace); }
bool getAttributeValueN(const char *pcszMatch, RTCString &str, size_t cchValueLimit, const char *pcszNamespace = NULL) const
{ return getAttributeValueN(pcszMatch, &str, cchValueLimit, pcszNamespace); }
bool getAttributeValuePathN(const char *pcszMatch, RTCString &str, size_t cchValueLimit, const char *pcszNamespace = NULL) const
{ return getAttributeValueN(pcszMatch, &str, cchValueLimit, pcszNamespace); }
/** @name Variants that for clarity does not use references for output params.
* @{ */
bool getAttributeValue(const char *pcszMatch, const char **ppcsz, const char *pcszNamespace = NULL) const;
bool getAttributeValue(const char *pcszMatch, RTCString *pStr, const char *pcszNamespace = NULL) const;
bool getAttributeValuePath(const char *pcszMatch, RTCString *pStr, const char *pcszNamespace = NULL) const;
bool getAttributeValue(const char *pcszMatch, int32_t *pi, const char *pcszNamespace = NULL) const;
bool getAttributeValue(const char *pcszMatch, uint32_t *pu, const char *pcszNamespace = NULL) const;
bool getAttributeValue(const char *pcszMatch, int64_t *piValue, const char *pcszNamespace = NULL) const;
bool getAttributeValue(const char *pcszMatch, uint64_t *pu, const char *pcszNamespace = NULL) const;
bool getAttributeValue(const char *pcszMatch, bool *pf, const char *pcszNamespace = NULL) const;
bool getAttributeValueN(const char *pcszMatch, const char **ppcsz, size_t cchValueLimit, const char *pcszNamespace = NULL) const;
bool getAttributeValueN(const char *pcszMatch, RTCString *pStr, size_t cchValueLimit, const char *pcszNamespace = NULL) const;
bool getAttributeValuePathN(const char *pcszMatch, RTCString *pStr, size_t cchValueLimit, const char *pcszNamespace = NULL) const;
/** @} */
/** @name Convenience methods for convering the element value.
* @{ */
bool getElementValue(int32_t *piValue) const;
bool getElementValue(uint32_t *puValue) const;
bool getElementValue(int64_t *piValue) const;
bool getElementValue(uint64_t *puValue) const;
bool getElementValue(bool *pfValue) const;
/** @} */
/** @name Convenience findChildElementValueP and getElementValue.
* @{ */
bool getChildElementValueP(const char *pcszPath, int32_t *piValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
return pElem && pElem->getElementValue(piValue);
}
bool getChildElementValueP(const char *pcszPath, uint32_t *puValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
return pElem && pElem->getElementValue(puValue);
}
bool getChildElementValueP(const char *pcszPath, int64_t *piValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
return pElem && pElem->getElementValue(piValue);
}
bool getChildElementValueP(const char *pcszPath, uint64_t *puValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
return pElem && pElem->getElementValue(puValue);
}
bool getChildElementValueP(const char *pcszPath, bool *pfValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
return pElem && pElem->getElementValue(pfValue);
}
/** @} */
/** @name Convenience findChildElementValueP and getElementValue with a
* default value being return if the child element isn't present.
*
* @remarks These will return false on conversion errors.
* @{ */
bool getChildElementValueDefP(const char *pcszPath, int32_t iDefault, int32_t *piValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
if (pElem)
return pElem->getElementValue(piValue);
*piValue = iDefault;
return true;
}
bool getChildElementValueDefP(const char *pcszPath, uint32_t uDefault, uint32_t *puValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
if (pElem)
return pElem->getElementValue(puValue);
*puValue = uDefault;
return true;
}
bool getChildElementValueDefP(const char *pcszPath, int64_t iDefault, int64_t *piValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
if (pElem)
return pElem->getElementValue(piValue);
*piValue = iDefault;
return true;
}
bool getChildElementValueDefP(const char *pcszPath, uint64_t uDefault, uint64_t *puValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
if (pElem)
return pElem->getElementValue(puValue);
*puValue = uDefault;
return true;
}
bool getChildElementValueDefP(const char *pcszPath, bool fDefault, bool *pfValue, const char *pcszNamespace = NULL) const
{
const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace);
if (pElem)
return pElem->getElementValue(pfValue);
*pfValue = fDefault;
return true;
}
/** @} */
ElementNode *createChild(const char *pcszElementName);
ContentNode *addContent(const char *pcszContent);
ContentNode *addContent(const RTCString &strContent)
{
return addContent(strContent.c_str());
}
ContentNode *setContent(const char *pcszContent);
ContentNode *setContent(const RTCString &strContent)
{
return setContent(strContent.c_str());
}
AttributeNode *setAttribute(const char *pcszName, const char *pcszValue);
AttributeNode *setAttribute(const char *pcszName, const RTCString &strValue)
{
return setAttribute(pcszName, strValue.c_str());
}
AttributeNode *setAttributePath(const char *pcszName, const RTCString &strValue);
AttributeNode *setAttribute(const char *pcszName, int32_t i);
AttributeNode *setAttribute(const char *pcszName, uint32_t i);
AttributeNode *setAttribute(const char *pcszName, int64_t i);
AttributeNode *setAttribute(const char *pcszName, uint64_t i);
AttributeNode *setAttributeHex(const char *pcszName, uint32_t i);
AttributeNode *setAttribute(const char *pcszName, bool f);
virtual ~ElementNode();
protected:
// hide the default constructor so people use only our factory methods
ElementNode(const ElementNode *pElmRoot, Node *pParent, PRTLISTANCHOR pListAnchor, xmlNode *pLibNode);
ElementNode(const ElementNode &x); // no copying
/** We keep a pointer to the root element for attribute namespace handling. */
const ElementNode *m_pElmRoot;
/** List of child elements and content nodes. */
RTLISTANCHOR m_children;
/** List of attributes nodes. */
RTLISTANCHOR m_attributes;
static void buildChildren(ElementNode *pElmRoot);
friend class Node;
friend class Document;
friend class XmlFileParser;
};
/**
* Node subclass that represents content (non-element text).
*
* Since the Node constructor is private, one can create new content nodes
* only through the following factory methods:
*
* -- ElementNode::addContent()
*/
class RT_DECL_CLASS ContentNode : public Node
{
public:
protected:
// hide the default constructor so people use only our factory methods
ContentNode(Node *pParent, PRTLISTANCHOR pListAnchor, xmlNode *pLibNode);
ContentNode(const ContentNode &x); // no copying
friend class Node;
friend class ElementNode;
};
/**
* Handy helper class with which one can loop through all or some children
* of a particular element. See NodesLoop::forAllNodes() for details.
*/
class RT_DECL_CLASS NodesLoop
{
public:
NodesLoop(const ElementNode &node, const char *pcszMatch = NULL);
~NodesLoop();
const ElementNode* forAllNodes() const;
private:
/* Obscure class data */
struct Data;
Data *m;
};
/**
* The XML document class. An instance of this needs to be created by a user
* of the XML classes and then passed to
*
* -- XmlMemParser or XmlFileParser to read an XML document; those classes then
* fill the caller's Document with ElementNode, ContentNode and AttributeNode
* instances. The typical sequence then is:
* @code
Document doc;
XmlFileParser parser;
parser.read("file.xml", doc);
Element *pElmRoot = doc.getRootElement();
@endcode
*
* -- XmlMemWriter or XmlFileWriter to write out an XML document after it has
* been created and filled. Example:
*
* @code
Document doc;
Element *pElmRoot = doc.createRootElement();
// add children
xml::XmlFileWriter writer(doc);
writer.write("file.xml", true);
@endcode
*/
class RT_DECL_CLASS Document
{
public:
Document();
~Document();
Document(const Document &x);
Document& operator=(const Document &x);
const ElementNode* getRootElement() const;
ElementNode* getRootElement();
ElementNode* createRootElement(const char *pcszRootElementName,
const char *pcszComment = NULL);
private:
friend class XmlMemParser;
friend class XmlFileParser;
friend class XmlMemWriter;
friend class XmlStringWriter;
friend class XmlFileWriter;
void refreshInternals();
/* Obscure class data */
struct Data;
Data *m;
};
/*
* XmlParserBase
*
*/
class RT_DECL_CLASS XmlParserBase
{
protected:
XmlParserBase();
~XmlParserBase();
xmlParserCtxtPtr m_ctxt;
};
/*
* XmlMemParser
*
*/
class RT_DECL_CLASS XmlMemParser : public XmlParserBase
{
public:
XmlMemParser();
~XmlMemParser();
void read(const void* pvBuf, size_t cbSize, const RTCString &strFilename, Document &doc);
};
/*
* XmlFileParser
*
*/
class RT_DECL_CLASS XmlFileParser : public XmlParserBase
{
public:
XmlFileParser();
~XmlFileParser();
void read(const RTCString &strFilename, Document &doc);
private:
/* Obscure class data */
struct Data;
struct Data *m;
static int ReadCallback(void *aCtxt, char *aBuf, int aLen) RT_NOTHROW_PROTO;
static int CloseCallback(void *aCtxt) RT_NOTHROW_PROTO;
};
/**
* XmlMemWriter
*/
class RT_DECL_CLASS XmlMemWriter
{
public:
XmlMemWriter();
~XmlMemWriter();
void write(const Document &doc, void** ppvBuf, size_t *pcbSize);
private:
void* m_pBuf;
};
/**
* XmlStringWriter - writes the XML to an RTCString instance.
*/
class RT_DECL_CLASS XmlStringWriter
{
public:
XmlStringWriter();
int write(const Document &rDoc, RTCString *pStrDst);
private:
static int WriteCallbackForSize(void *pvUser, const char *pachBuf, int cbToWrite) RT_NOTHROW_PROTO;
static int WriteCallbackForReal(void *pvUser, const char *pachBuf, int cbToWrite) RT_NOTHROW_PROTO;
static int CloseCallback(void *pvUser) RT_NOTHROW_PROTO;
/** Pointer to the destination string while we're in the write() call. */
RTCString *m_pStrDst;
/** Set by WriteCallback if we cannot grow the destination string. */
bool m_fOutOfMemory;
};
/**
* XmlFileWriter
*/
class RT_DECL_CLASS XmlFileWriter
{
public:
XmlFileWriter(Document &doc);
~XmlFileWriter();
/**
* Writes the XML document to the specified file.
*
* @param pcszFilename The name of the output file.
* @param fSafe If @c true, some extra safety precautions will be
* taken when writing the file:
* -# The file is written with a '-tmp' suffix.
* -# It is flushed to disk after writing.
* -# Any original file is renamed to '-prev'.
* -# The '-tmp' file is then renamed to the
* specified name.
* -# The directory changes are flushed to disk.
* The suffixes are available via s_pszTmpSuff and
* s_pszPrevSuff.
*/
void write(const char *pcszFilename, bool fSafe);
static int WriteCallback(void *aCtxt, const char *aBuf, int aLen) RT_NOTHROW_PROTO;
static int CloseCallback(void *aCtxt) RT_NOTHROW_PROTO;
/** The suffix used by XmlFileWriter::write() for the temporary file. */
static const char * const s_pszTmpSuff;
/** The suffix used by XmlFileWriter::write() for the previous (backup) file. */
static const char * const s_pszPrevSuff;
private:
void writeInternal(const char *pcszFilename, bool fSafe);
/* Obscure class data */
struct Data;
Data *m;
};
#if defined(_MSC_VER)
#pragma warning (default:4251)
#endif
/** @} */
} // end namespace xml
#endif /* !IPRT_INCLUDED_cpp_xml_h */
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