mitab_priv.h

mitab,读取MapInfo的地图文件

    int         m_nCurIndexEntry;
    TABRawBinBlock *m_poDataBlock;
    int         m_numEntriesInNode;
    GInt32      m_nPrevNodePtr;
    GInt32      m_nNextNodePtr;

    int         GotoNodePtr(GInt32 nNewNodePtr);
    GInt32      ReadIndexEntry(int nEntryNo, GByte *pKeyValue);
    int         IndexKeyCmp(GByte *pKeyValue, int nEntryNo);

    int         InsertEntry(GByte *pKeyValue, GInt32 nRecordNo,
                            GBool bInsertAfterCurChild=FALSE,
                            GBool bMakeNewEntryCurChild=FALSE);
    int         SetNodeBufferDirectly(int numEntries, GByte *pBuf,
                                      int nCurIndexEntry=0, 
                                      TABINDNode *poCurChild=NULL);

   public:
    TABINDNode(TABAccess eAccessMode = TABRead);
    ~TABINDNode();

    int         InitNode(FILE *fp, int nBlockPtr, 
                         int nKeyLength, int nSubTreeDepth, GBool bUnique,
                         TABBinBlockManager *poBlockMgr=NULL,
                         TABINDNode *poParentNode=NULL,
                         int nPrevNodePtr=0, int nNextNodePtr=0);

    int         SetFieldType(TABFieldType eType);
    TABFieldType GetFieldType()         {return m_eFieldType;};

    void        SetUnique(GBool bUnique){m_bUnique = bUnique;};
    GBool       IsUnique()              {return m_bUnique;};

    int         GetKeyLength()          {return m_nKeyLength;};
    int         GetSubTreeDepth()       {return m_nSubTreeDepth;};
    GInt32      GetNodeBlockPtr()       {return m_nCurDataBlockPtr;};
    int         GetNumEntries()         {return m_numEntriesInNode;};
    int         GetMaxNumEntries()      {return (512-12)/(m_nKeyLength+4);};

    GInt32      FindFirst(GByte *pKeyValue);
    GInt32      FindNext(GByte *pKeyValue);

    int         CommitToFile();

    int         AddEntry(GByte *pKeyValue, GInt32 nRecordNo,
                         GBool bAddInThisNodeOnly=FALSE,
                         GBool bInsertAfterCurChild=FALSE,
                         GBool bMakeNewEntryCurChild=FALSE);
    int         SplitNode();
    int         SplitRootNode();
    GByte*      GetNodeKey();
    int         UpdateCurChildEntry(GByte *pKeyValue, GInt32 nRecordNo);
    int         UpdateSplitChild(GByte *pKeyValue1, GInt32 nRecordNo1,
                                 GByte *pKeyValue2, GInt32 nRecordNo2,
                                 int nNewCurChildNo /* 1 or 2 */);

    int         SetNodeBlockPtr(GInt32 nThisNodePtr);
    int         SetPrevNodePtr(GInt32 nPrevNodePtr);
    int         SetNextNodePtr(GInt32 nNextNodePtr);

#ifdef DEBUG
    void Dump(FILE *fpOut = NULL);
#endif

};


/*---------------------------------------------------------------------
 *                      class TABINDFile
 *
 * Class to handle table field index (.IND) files... we use this
 * class as the main entry point to open and search the table field indexes.
 * Note that .IND files are supported for read access only.
 *--------------------------------------------------------------------*/

class TABINDFile
{
  private:
    char        *m_pszFname;
    FILE        *m_fp;
    TABAccess   m_eAccessMode;

    TABBinBlockManager m_oBlockManager;

    int         m_numIndexes;
    TABINDNode  **m_papoIndexRootNodes;
    GByte       **m_papbyKeyBuffers;

    int         ValidateIndexNo(int nIndexNumber);
    int         ReadHeader();
    int         WriteHeader();

   public:
    TABINDFile();
    ~TABINDFile();

    int         Open(const char *pszFname, const char *pszAccess, 
                     GBool bTestOpenNoError=FALSE);
    int         Close();

    int         GetNumIndexes() {return m_numIndexes;};
    int         SetIndexFieldType(int nIndexNumber, TABFieldType eType);
    int         SetIndexUnique(int nIndexNumber, GBool bUnique=TRUE);
    GByte      *BuildKey(int nIndexNumber, GInt32 nValue);
    GByte      *BuildKey(int nIndexNumber, const char *pszStr);
    GByte      *BuildKey(int nIndexNumber, double dValue);
    GInt32      FindFirst(int nIndexNumber, GByte *pKeyValue);
    GInt32      FindNext(int nIndexNumber, GByte *pKeyValue);

    int         CreateIndex(TABFieldType eType, int nFieldSize);
    int         AddEntry(int nIndexNumber, GByte *pKeyValue, GInt32 nRecordNo);

#ifdef DEBUG
    void Dump(FILE *fpOut = NULL);
#endif

};


/*---------------------------------------------------------------------
 *                      class TABDATFile
 *
 * Class to handle Read/Write operation on .DAT files... the .DAT file
 * contains the table of attribute field values.
 *--------------------------------------------------------------------*/

class TABDATFile
{
  private:
    char        *m_pszFname;
    FILE        *m_fp;
    TABAccess   m_eAccessMode;
    TABTableType m_eTableType;

    TABRawBinBlock *m_poHeaderBlock;
    int         m_numFields;
    TABDATFieldDef *m_pasFieldDef;

    TABRawBinBlock *m_poRecordBlock;
    int         m_nBlockSize;
    int         m_nRecordSize;
    int         m_nCurRecordId;
    GBool       m_bCurRecordDeletedFlag;

    GInt32      m_numRecords;
    GInt32      m_nFirstRecordPtr;
    GBool       m_bWriteHeaderInitialized;

    int         InitWriteHeader();
    int         WriteHeader();

	// We know that character strings are limited to 254 chars in MapInfo
	// Using a buffer pr. class instance to avoid threading issues with the library
	char		m_szBuffer[256];

   public:
    TABDATFile();
    ~TABDATFile();

    int         Open(const char *pszFname, const char *pszAccess,
                     TABTableType eTableType =TABTableNative);
    int         Close();

    int         GetNumFields();
    TABFieldType GetFieldType(int nFieldId);
    int         GetFieldWidth(int nFieldId);
    int         GetFieldPrecision(int nFieldId);
    int         ValidateFieldInfoFromTAB(int iField, const char *pszName,
                                         TABFieldType eType,
                                         int nWidth, int nPrecision);

    int         AddField(const char *pszName, TABFieldType eType,
                         int nWidth, int nPrecision=0);

    GInt32      GetNumRecords();
    TABRawBinBlock *GetRecordBlock(int nRecordId);
    GBool       IsCurrentRecordDeleted() { return m_bCurRecordDeletedFlag;};
    int         CommitRecordToFile();

    const char  *ReadCharField(int nWidth);
    GInt32      ReadIntegerField(int nWidth);
    GInt16      ReadSmallIntField(int nWidth);
    double      ReadFloatField(int nWidth);
    double      ReadDecimalField(int nWidth);
    const char  *ReadLogicalField(int nWidth);
    const char  *ReadDateField(int nWidth);
    const char  *ReadTimeField(int nWidth);
    const char  *ReadDateTimeField(int nWidth);

    int         WriteCharField(const char *pszValue, int nWidth,
                               TABINDFile *poINDFile, int nIndexNo);
    int         WriteIntegerField(GInt32 nValue,
                                  TABINDFile *poINDFile, int nIndexNo);
    int         WriteSmallIntField(GInt16 nValue,
                                   TABINDFile *poINDFile, int nIndexNo);
    int         WriteFloatField(double dValue,
                                TABINDFile *poINDFile, int nIndexNo);
    int         WriteDecimalField(double dValue, int nWidth, int nPrecision,
                                  TABINDFile *poINDFile, int nIndexNo);
    int         WriteLogicalField(const char *pszValue,
                                  TABINDFile *poINDFile, int nIndexNo);
    int         WriteDateField(const char *pszValue,
                               TABINDFile *poINDFile, int nIndexNo);
    int         WriteTimeField(const char *pszValue,
                               TABINDFile *poINDFile, int nIndexNo);
    int         WriteDateTimeField(const char *pszValue,
                               TABINDFile *poINDFile, int nIndexNo);

#ifdef DEBUG
    void Dump(FILE *fpOut = NULL);
#endif

};


/*---------------------------------------------------------------------
 *                      class TABRelation
 *
 * Class that maintains a relation between 2 tables through a field
 * in each table (the SQL "where table1.field1=table2.field2" found in 
 * TABView datasets).
 *
 * An instance of this class is used to read data records from the
 * combined tables as if they were a single one.
 *--------------------------------------------------------------------*/

class TABRelation
{
  private:
    /* Information about the main table.
     */
    TABFile     *m_poMainTable;
    char        *m_pszMainFieldName;
    int         m_nMainFieldNo;

    /* Information about the related table.  
     * NOTE: The related field MUST be indexed.
     */
    TABFile     *m_poRelTable;
    char        *m_pszRelFieldName;
    int         m_nRelFieldNo;

    TABINDFile  *m_poRelINDFileRef;
    int         m_nRelFieldIndexNo;

    int         m_nUniqueRecordNo;

    /* Main and Rel table field map:
     * For each field in the source tables, -1 means that the field is not
     * selected, and a value >=0 is the index of this field in the combined
     * FeatureDefn
     */
    int         *m_panMainTableFieldMap;
    int         *m_panRelTableFieldMap;

    OGRFeatureDefn *m_poDefn;

    void        ResetAllMembers();
    GByte       *BuildFieldKey(TABFeature *poFeature, int nFieldNo,
                                  TABFieldType eType, int nIndexNo);

   public:
    TABRelation();
    ~TABRelation();

    int         Init(const char *pszViewName,
                     TABFile *poMainTable, TABFile *poRelTable,
                     const char *pszMainFieldName,
                     const char *pszRelFieldName,
                     char **papszSelectedFields);
    int         CreateRelFields();

    OGRFeatureDefn *GetFeatureDefn()  {return m_poDefn;};
    TABFieldType    GetNativeFieldType(int nFieldId);
    TABFeature     *GetFeature(int nFeatureId);

    int         SetFeature(TABFeature *poFeature, int nFeatureId=-1);

    int         SetFeatureDefn(OGRFeatureDefn *poFeatureDefn,
                           TABFieldType *paeMapInfoNativeFieldTypes=NULL);
    int         AddFieldNative(const char *pszName, TABFieldType eMapInfoType,
                               int nWidth=0, int nPrecision=0,
                               GBool bIndexed=FALSE, GBool bUnique=FALSE);

    int         SetFieldIndexed(int nFieldId);
    GBool       IsFieldIndexed(int nFieldId);
    GBool       IsFieldUnique(int nFieldId);

    const char *GetMainFieldName()      {return m_pszMainFieldName;};
    const char *GetRelFieldName()       {return m_pszRelFieldName;};
};


/*---------------------------------------------------------------------
 *                      class MIDDATAFile
 *
 * Class to handle a file pointer with a copy of the latest readed line
 *
 *--------------------------------------------------------------------*/

class MIDDATAFile
{
   public:
      MIDDATAFile();
     ~MIDDATAFile();

     int         Open(const char *pszFname, const char *pszAccess);
     int         Close();

     const char *GetLine();
     const char *GetLastLine();
     int Rewind();
     void SaveLine(const char *pszLine);
     const char *GetSavedLine();
     void WriteLine(const char*, ...);
     GBool IsValidFeature(const char *pszString);

//  Translation information
     void SetTranslation(double, double, double, double);
     double GetXTrans(double);
     double GetYTrans(double);
     double GetXMultiplier(){return m_dfXMultiplier;}
     const char *GetDelimiter(){return m_pszDelimiter;}
     void SetDelimiter(const char *pszDelimiter){m_pszDelimiter=pszDelimiter;}

     void SetEof(GBool bEof);
     GBool GetEof();

     private:
       FILE *m_fp;
       const char *m_pszDelimiter;

       // Set limit for the length of a line
#define MIDMAXCHAR 10000
       char m_szLastRead[MIDMAXCHAR];
       char m_szSavedLine[MIDMAXCHAR];

       char        *m_pszFname;
       TABAccess   m_eAccessMode;
       double      m_dfXMultiplier;
       double      m_dfYMultiplier;
       double      m_dfXDisplacement;
       double      m_dfYDisplacement;
       GBool       m_bEof;
};



/*=====================================================================
                        Function prototypes
 =====================================================================*/

TABRawBinBlock *TABCreateMAPBlockFromFile(FILE *fpSrc, int nOffset, 
                                          int nSize = 512, 
                                          GBool bHardBlockSize = TRUE,
                                          TABAccess eAccessMode = TABRead);


#endif /* _MITAB_PRIV_H_INCLUDED_ */