xmlparse.c

一个很好用的解析

/*
Copyright (c) 1998, 1999, 2000 Thai Open Source Software Center Ltd
See the file copying.txt for copying permission.
*/

/* In 2001, this was part of the Expat package.  We copied it into
   Xmlrpc-c because it's easier on the user than making him get and
   link Expat separately, and we don't expect to benefit from separate
   maintenance of Expat.

   But we changed all the external symbols that in Expat are named
   "XML_xxxx" to "xmlrpc_XML_xxxx" because people do link Xmlrpc-c
   libraries into programs that also link Expat (a good example is
   where an Apache module uses Xmlrpc-c).  We don't want our names to
   collide with Expat's.
*/

#include <stddef.h>

#include "xmlrpc_config.h"
#include "c_util.h"
#include "xmldef.h"
#include "xmlparse.h"

#ifdef XML_UNICODE
#define XML_ENCODE_MAX XML_UTF16_ENCODE_MAX
#define XmlConvert XmlUtf16Convert
#define XmlGetInternalEncoding xmlrpc_XmlGetUtf16InternalEncoding
#define XmlGetInternalEncodingNS xmlrpc_XmlGetUtf16InternalEncodingNS
#define XmlEncode xmlrpc_XmlUtf16Encode
#define MUST_CONVERT(enc, s) (!(enc)->isUtf16 || (((unsigned long)s) & 1))
typedef unsigned short ICHAR;
#else
#define XML_ENCODE_MAX XML_UTF8_ENCODE_MAX
#define XmlConvert XmlUtf8Convert
#define XmlGetInternalEncoding xmlrpc_XmlGetUtf8InternalEncoding
#define XmlGetInternalEncodingNS xmlrpc_XmlGetUtf8InternalEncodingNS
#define XmlEncode xmlrpc_XmlUtf8Encode
#define MUST_CONVERT(enc, s) (!(enc)->isUtf8)
typedef char ICHAR;
#endif


#ifndef XML_NS

#define XmlInitEncodingNS xmlrpc_XmlInitEncoding
#define XmlInitUnknownEncodingNS xmlrpc_XmlInitUnknownEncoding
#undef XmlGetInternalEncodingNS
#define XmlGetInternalEncodingNS XmlGetInternalEncoding
#define XmlParseXmlDeclNS xmlrpc_XmlParseXmlDecl

#endif

#ifdef XML_UNICODE_WCHAR_T
#define XML_T(x) L ## x
#else
#define XML_T(x) x
#endif

/* Round up n to be a multiple of sz, where sz is a power of 2. */
#define ROUND_UP(n, sz) (((n) + ((sz) - 1)) & ~((sz) - 1))

#include "xmltok.h"
#include "xmlrole.h"

typedef const XML_Char *KEY;

typedef struct {
  KEY name;
} NAMED;

typedef struct {
  NAMED **v;
  size_t size;
  size_t used;
  size_t usedLim;
} HASH_TABLE;

typedef struct {
  NAMED **p;
  NAMED **end;
} HASH_TABLE_ITER;

#define INIT_TAG_BUF_SIZE 32  /* must be a multiple of sizeof(XML_Char) */
#define INIT_DATA_BUF_SIZE 1024
#define INIT_ATTS_SIZE 16
#define INIT_BLOCK_SIZE 1024
#define INIT_BUFFER_SIZE 1024

#define EXPAND_SPARE 24

typedef struct binding {
  struct prefix *prefix;
  struct binding *nextTagBinding;
  struct binding *prevPrefixBinding;
  const struct attribute_id *attId;
  XML_Char *uri;
  int uriLen;
  int uriAlloc;
} BINDING;

typedef struct prefix {
  const XML_Char *name;
  BINDING *binding;
} PREFIX;

typedef struct {
  const XML_Char *str;
  const XML_Char *localPart;
  int uriLen;
} TAG_NAME;

typedef struct tag {
  struct tag *parent;
  const char *rawName;
  int rawNameLength;
  TAG_NAME name;
  char *buf;
  char *bufEnd;
  BINDING *bindings;
} TAG;

typedef struct {
  const XML_Char *name;
  const XML_Char *textPtr;
  int textLen;
  const XML_Char *systemId;
  const XML_Char *base;
  const XML_Char *publicId;
  const XML_Char *notation;
  char open;
} ENTITY;

typedef struct block {
  struct block *next;
  int size;
  XML_Char s[1];
} BLOCK;

typedef struct {
  BLOCK *blocks;
  BLOCK *freeBlocks;
  const XML_Char *end;
  XML_Char *ptr;
  XML_Char *start;
} STRING_POOL;

/* The XML_Char before the name is used to determine whether
an attribute has been specified. */
typedef struct attribute_id {
  XML_Char *name;
  PREFIX *prefix;
  char maybeTokenized;
  char xmlns;
} ATTRIBUTE_ID;

typedef struct {
  const ATTRIBUTE_ID *id;
  char isCdata;
  const XML_Char *value;
} DEFAULT_ATTRIBUTE;

typedef struct {
  const XML_Char *name;
  PREFIX *prefix;
  const ATTRIBUTE_ID *idAtt;
  int nDefaultAtts;
  int allocDefaultAtts;
  DEFAULT_ATTRIBUTE *defaultAtts;
} ELEMENT_TYPE;

typedef struct {
  HASH_TABLE generalEntities;
  HASH_TABLE elementTypes;
  HASH_TABLE attributeIds;
  HASH_TABLE prefixes;
  STRING_POOL pool;
  int complete;
  int standalone;
#ifdef XML_DTD
  HASH_TABLE paramEntities;
#endif /* XML_DTD */
  PREFIX defaultPrefix;
} DTD;

typedef struct open_internal_entity {
  const char *internalEventPtr;
  const char *internalEventEndPtr;
  struct open_internal_entity *next;
  ENTITY *entity;
} OPEN_INTERNAL_ENTITY;

typedef enum XML_Error Processor(XML_Parser parser,
                                 const char *start,
                                 const char *end,
                                 const char **endPtr);

static Processor prologProcessor;
static Processor prologInitProcessor;
static Processor contentProcessor;
static Processor cdataSectionProcessor;
#ifdef XML_DTD
static Processor ignoreSectionProcessor;
#endif /* XML_DTD */
static Processor epilogProcessor;
static Processor errorProcessor;
static Processor externalEntityInitProcessor;
static Processor externalEntityInitProcessor2;
static Processor externalEntityInitProcessor3;
static Processor externalEntityContentProcessor;

static enum XML_Error
handleUnknownEncoding(XML_Parser parser, const XML_Char *encodingName);
static enum XML_Error
processXmlDecl(XML_Parser parser, int isGeneralTextEntity, const char *, const char *);
static enum XML_Error
initializeEncoding(XML_Parser parser);
static enum XML_Error
doProlog(XML_Parser parser, const ENCODING *enc, const char *s,
         const char *end, int tok, const char *next, const char **nextPtr);
static enum XML_Error
doContent(XML_Parser parser, int startTagLevel, const ENCODING *enc,
          const char *start, const char *end, const char **endPtr);
static enum XML_Error
doCdataSection(XML_Parser parser, const ENCODING *, const char **startPtr, const char *end, const char **nextPtr);
#ifdef XML_DTD
static enum XML_Error
doIgnoreSection(XML_Parser parser, const ENCODING *, const char **startPtr, const char *end, const char **nextPtr);
#endif /* XML_DTD */
static enum XML_Error storeAtts(XML_Parser parser, const ENCODING *, const char *s,
                                TAG_NAME *tagNamePtr, BINDING **bindingsPtr);
static
int addBinding(XML_Parser parser, PREFIX *prefix, const ATTRIBUTE_ID *attId, const XML_Char *uri, BINDING **bindingsPtr);
static int
defineAttribute(ELEMENT_TYPE *type, ATTRIBUTE_ID *, int isCdata, int isId, const XML_Char *dfltValue);
static enum XML_Error
storeAttributeValue(XML_Parser parser, const ENCODING *, int isCdata, const char *, const char *,
                    STRING_POOL *);
static enum XML_Error
appendAttributeValue(XML_Parser parser, const ENCODING *, int isCdata, const char *, const char *,
                    STRING_POOL *);
static ATTRIBUTE_ID *
getAttributeId(XML_Parser parser, const ENCODING *enc, const char *start, const char *end);
static int setElementTypePrefix(XML_Parser parser, ELEMENT_TYPE *);
static enum XML_Error
storeEntityValue(XML_Parser parser, const ENCODING *enc, const char *start, const char *end);
static int
reportProcessingInstruction(XML_Parser parser, const ENCODING *enc, const char *start, const char *end);
static int
reportComment(XML_Parser parser, const ENCODING *enc, const char *start, const char *end);
static void
reportDefault(XML_Parser parser, const ENCODING *enc, const char *start, const char *end);

static const XML_Char *getContext(XML_Parser parser);
static int setContext(XML_Parser parser, const XML_Char *context);
static void normalizePublicId(XML_Char *s);
static int dtdInit(DTD *);
static void dtdDestroy(DTD *);
static int dtdCopy(DTD *newDtd, const DTD *oldDtd);
static int copyEntityTable(HASH_TABLE *, STRING_POOL *, const HASH_TABLE *);
#ifdef XML_DTD
static void dtdSwap(DTD *, DTD *);
#endif /* XML_DTD */
static NAMED *lookup(HASH_TABLE *table, KEY name, size_t createSize);
static void hashTableInit(HASH_TABLE *);
static void hashTableDestroy(HASH_TABLE *);
static void hashTableIterInit(HASH_TABLE_ITER *, const HASH_TABLE *);
static NAMED *hashTableIterNext(HASH_TABLE_ITER *);
static void poolInit(STRING_POOL *);
static void poolClear(STRING_POOL *);
static void poolDestroy(STRING_POOL *);
static XML_Char *poolAppend(STRING_POOL *pool, const ENCODING *enc,
                            const char *ptr, const char *end);
static XML_Char *poolStoreString(STRING_POOL *pool, const ENCODING *enc,
                                  const char *ptr, const char *end);
static int poolGrow(STRING_POOL *pool);
static const XML_Char *poolCopyString(STRING_POOL *pool, const XML_Char *s);
static const XML_Char *poolCopyStringN(STRING_POOL *pool, const XML_Char *s, int n);

#define poolStart(pool) ((pool)->start)
#define poolEnd(pool) ((pool)->ptr)
#define poolLength(pool) ((pool)->ptr - (pool)->start)
#define poolChop(pool) ((void)--(pool->ptr))
#define poolLastChar(pool) (((pool)->ptr)[-1])
#define poolDiscard(pool) ((pool)->ptr = (pool)->start)
#define poolFinish(pool) ((pool)->start = (pool)->ptr)
#define poolAppendChar(pool, c) \
  (((pool)->ptr == (pool)->end && !poolGrow(pool)) \
   ? 0 \
   : ((*((pool)->ptr)++ = c), 1))

typedef struct {
  /* The first member must be userData so that the XML_GetUserData macro works. */
  void *m_userData;
  void *m_handlerArg;
  char *m_buffer;
  /* first character to be parsed */
  const char *m_bufferPtr;
  /* past last character to be parsed */
  char *m_bufferEnd;
  /* allocated end of buffer */
  const char *m_bufferLim;
  long m_parseEndByteIndex;
  const char *m_parseEndPtr;
  XML_Char *m_dataBuf;
  XML_Char *m_dataBufEnd;
  XML_StartElementHandler m_startElementHandler;
  XML_EndElementHandler m_endElementHandler;
  XML_CharacterDataHandler m_characterDataHandler;
  XML_ProcessingInstructionHandler m_processingInstructionHandler;
  XML_CommentHandler m_commentHandler;
  XML_StartCdataSectionHandler m_startCdataSectionHandler;
  XML_EndCdataSectionHandler m_endCdataSectionHandler;
  XML_DefaultHandler m_defaultHandler;
  XML_StartDoctypeDeclHandler m_startDoctypeDeclHandler;
  XML_EndDoctypeDeclHandler m_endDoctypeDeclHandler;
  XML_UnparsedEntityDeclHandler m_unparsedEntityDeclHandler;
  XML_NotationDeclHandler m_notationDeclHandler;
  XML_ExternalParsedEntityDeclHandler m_externalParsedEntityDeclHandler;
  XML_InternalParsedEntityDeclHandler m_internalParsedEntityDeclHandler;
  XML_StartNamespaceDeclHandler m_startNamespaceDeclHandler;
  XML_EndNamespaceDeclHandler m_endNamespaceDeclHandler;
  XML_NotStandaloneHandler m_notStandaloneHandler;
  XML_ExternalEntityRefHandler m_externalEntityRefHandler;
  void *m_externalEntityRefHandlerArg;
  XML_UnknownEncodingHandler m_unknownEncodingHandler;
  const ENCODING *m_encoding;
  INIT_ENCODING m_initEncoding;
  const ENCODING *m_internalEncoding;
  const XML_Char *m_protocolEncodingName;
  int m_ns;
  void *m_unknownEncodingMem;
  void *m_unknownEncodingData;
  void *m_unknownEncodingHandlerData;
  void (*m_unknownEncodingRelease)(void *);
  PROLOG_STATE m_prologState;
  Processor *m_processor;
  enum XML_Error m_errorCode;
  const char *m_eventPtr;
  const char *m_eventEndPtr;
  const char *m_positionPtr;
  OPEN_INTERNAL_ENTITY *m_openInternalEntities;
  int m_defaultExpandInternalEntities;
  int m_tagLevel;
  ENTITY *m_declEntity;
  const XML_Char *m_declNotationName;
  const XML_Char *m_declNotationPublicId;
  ELEMENT_TYPE *m_declElementType;
  ATTRIBUTE_ID *m_declAttributeId;
  char m_declAttributeIsCdata;
  char m_declAttributeIsId;
  DTD m_dtd;
  const XML_Char *m_curBase;
  TAG *m_tagStack;
  TAG *m_freeTagList;
  BINDING *m_inheritedBindings;
  BINDING *m_freeBindingList;
  int m_attsSize;
  int m_nSpecifiedAtts;
  int m_idAttIndex;
  ATTRIBUTE *m_atts;
  POSITION m_position;
  STRING_POOL m_tempPool;
  STRING_POOL m_temp2Pool;
  char *m_groupConnector;
  unsigned m_groupSize;
  int m_hadExternalDoctype;
  XML_Char m_namespaceSeparator;
#ifdef XML_DTD
  enum XML_ParamEntityParsing m_paramEntityParsing;
  XML_Parser m_parentParser;
#endif
} Parser;

#define userData (((Parser *)parser)->m_userData)
#define handlerArg (((Parser *)parser)->m_handlerArg)
#define startElementHandler (((Parser *)parser)->m_startElementHandler)
#define endElementHandler (((Parser *)parser)->m_endElementHandler)
#define characterDataHandler (((Parser *)parser)->m_characterDataHandler)
#define processingInstructionHandler (((Parser *)parser)->m_processingInstructionHandler)
#define commentHandler (((Parser *)parser)->m_commentHandler)
#define startCdataSectionHandler (((Parser *)parser)->m_startCdataSectionHandler)
#define endCdataSectionHandler (((Parser *)parser)->m_endCdataSectionHandler)
#define defaultHandler (((Parser *)parser)->m_defaultHandler)
#define startDoctypeDeclHandler (((Parser *)parser)->m_startDoctypeDeclHandler)
#define endDoctypeDeclHandler (((Parser *)parser)->m_endDoctypeDeclHandler)
#define unparsedEntityDeclHandler (((Parser *)parser)->m_unparsedEntityDeclHandler)
#define notationDeclHandler (((Parser *)parser)->m_notationDeclHandler)
#define externalParsedEntityDeclHandler (((Parser *)parser)->m_externalParsedEntityDeclHandler)
#define internalParsedEntityDeclHandler (((Parser *)parser)->m_internalParsedEntityDeclHandler)
#define startNamespaceDeclHandler (((Parser *)parser)->m_startNamespaceDeclHandler)
#define endNamespaceDeclHandler (((Parser *)parser)->m_endNamespaceDeclHandler)
#define notStandaloneHandler (((Parser *)parser)->m_notStandaloneHandler)
#define externalEntityRefHandler (((Parser *)parser)->m_externalEntityRefHandler)
#define externalEntityRefHandlerArg (((Parser *)parser)->m_externalEntityRefHandlerArg)
#define unknownEncodingHandler (((Parser *)parser)->m_unknownEncodingHandler)
#define encoding (((Parser *)parser)->m_encoding)
#define initEncoding (((Parser *)parser)->m_initEncoding)
#define internalEncoding (((Parser *)parser)->m_internalEncoding)
#define unknownEncodingMem (((Parser *)parser)->m_unknownEncodingMem)
#define unknownEncodingData (((Parser *)parser)->m_unknownEncodingData)
#define unknownEncodingHandlerData \
  (((Parser *)parser)->m_unknownEncodingHandlerData)
#define unknownEncodingRelease (((Parser *)parser)->m_unknownEncodingRelease)
#define protocolEncodingName (((Parser *)parser)->m_protocolEncodingName)
#define ns (((Parser *)parser)->m_ns)
#define prologState (((Parser *)parser)->m_prologState)
#define processor (((Parser *)parser)->m_processor)
#define errorCode (((Parser *)parser)->m_errorCode)
#define eventPtr (((Parser *)parser)->m_eventPtr)
#define eventEndPtr (((Parser *)parser)->m_eventEndPtr)
#define positionPtr (((Parser *)parser)->m_positionPtr)
#define position (((Parser *)parser)->m_position)
#define openInternalEntities (((Parser *)parser)->m_openInternalEntities)
#define defaultExpandInternalEntities (((Parser *)parser)->m_defaultExpandInternalEntities)
#define tagLevel (((Parser *)parser)->m_tagLevel)
#define buffer (((Parser *)parser)->m_buffer)