avc.h

支持各种栅格图像和矢量图像读取的库

    double      dHeight;
    double      dV2;    /* ??? */
    double      dV3;    /* ??? */

    char        *pszText;

    AVCVertex   *pasVertices;
}AVCTxt;

/*---------------------------------------------------------------------
 * AVCRxp: Information about a RXP record (something related to regions...)
 *--------------------------------------------------------------------*/
typedef struct AVCRxp_t
{
    GInt32      n1;
    GInt32      n2;
}AVCRxp;


/*---------------------------------------------------------------------
 * AVCTableDef: Definition of an INFO table's structure.  
 *               This info is read from several files: 
 *                   info/arc.dir
 *                   info/arc####.dat
 *                   info/arc####.nit
 *
 *               And the data for the table itself is stored in a binary
 *               file in the coverage directory.
 *--------------------------------------------------------------------*/

typedef struct AVCFieldInfo_t
{
    char        szName[17];
    GInt16      nSize;
    GInt16      v2;
    GInt16      nOffset;
    GInt16      v4;
    GInt16      v5;
    GInt16      nFmtWidth;
    GInt16      nFmtPrec;
    GInt16      nType1;
    GInt16      nType2;
    GInt16      v10;
    GInt16      v11;
    GInt16      v12;
    GInt16      v13;
    char        szAltName[17];
    GInt16      nIndex;         /* >0 if valid, or -1 if field is deleted */
}AVCFieldInfo;

#define AVC_FT_DATE     10
#define AVC_FT_CHAR     20
#define AVC_FT_FIXINT   30
#define AVC_FT_FIXNUM   40
#define AVC_FT_BININT   50
#define AVC_FT_BINFLOAT 60


typedef struct AVCTableDef_t
{
    /* Stuff read from the arc.dir file 
     * (1 record, corresponding to this table, from the arc.dir file)
     */
    char        szTableName[33];
    char        szInfoFile[9];
    GInt16      numFields;
    GInt16      nRecSize;
    GInt32      numRecords;
    char        szExternal[3];  /* "XX" or "  " */
    GInt16      bDeletedFlag;   /* 1 if deleted, 0 if table is active */

    /* Data file path read from the arc####.dat file
     */
    char        szDataFile[81];

    /* Field information read from the arc####.nit file
     */
    AVCFieldInfo *pasFieldDef;

}AVCTableDef;

typedef struct AVCField_t
{
    GInt16      nInt16;
    GInt32      nInt32;
    float       fFloat;
    double      dDouble;
    char        *pszStr;
}AVCField;

/*---------------------------------------------------------------------
 * Stuff related to buffered reading of raw binary files
 *--------------------------------------------------------------------*/

#define AVCRAWBIN_READBUFSIZE 1024

typedef struct AVCRawBinFile_t
{
    FILE        *fp;
    char        *pszFname;
    AVCAccess   eAccess;
    AVCByteOrder eByteOrder;
    GByte       abyBuf[AVCRAWBIN_READBUFSIZE];
    int         nOffset;        /* Location of current buffer in the file */
    int         nCurSize;       /* Nbr of bytes currently loaded        */
    int         nCurPos;        /* Next byte to read from abyBuf[]      */

    int         nFileDataSize;  /* File Size as stated in the header */
                                /* EOF=TRUE passed this point in file */
                                /* Set to -1 if not specified. */

    /* Handle on dataset's multibyte character encoding info. */
    AVCDBCSInfo *psDBCSInfo;

}AVCRawBinFile;


/*---------------------------------------------------------------------
 * Stuff related to reading and writing binary coverage files
 *--------------------------------------------------------------------*/

typedef struct AVCBinHeader_t
{
    GUInt32     nSignature;
    GInt32      nPrecision;     /* <0 for double prec., >0 for single prec. */
    GInt32      nRecordSize;    /* nbr of 2 byte words, 0 for var. length   */
    GInt32      nLength;        /* Overall file length, in 2 byte words     */
}AVCBinHeader;

typedef struct AVCBinFile_t
{
    AVCRawBinFile *psRawBinFile;
    char          *pszFilename;
    AVCRawBinFile *psIndexFile;   /* Index file, Write mode only */

    DBFHandle     hDBFFile;       /* Used for AVCCoverPC/PC2 DBF TABLES only */
    int           nCurDBFRecord;  /* 0-based record index in DBF file */

    AVCCoverType  eCoverType;
    AVCFileType   eFileType;
    int           nPrecision;     /* AVC_SINGLE/DOUBLE_PREC  */

    union
    {
        AVCTableDef  *psTableDef;
    }hdr;

    /* cur.* : temp. storage used to read one record (ARC, PAL, ... or 
     *         Table record) from the file.
     */
    union
    {
        AVCArc       *psArc;
        AVCPal       *psPal;
        AVCCnt       *psCnt;
        AVCLab       *psLab;
        AVCTol       *psTol;
        AVCTxt       *psTxt;
        AVCRxp       *psRxp;
        AVCField     *pasFields;
        char         **papszPrj;
    }cur;

}AVCBinFile;

/*---------------------------------------------------------------------
 * Stuff related to the generation of E00
 *--------------------------------------------------------------------*/

/*---------------------------------------------------------------------
 *                        AVCE00GenInfo structure
 * This structure is used by the E00 generator functions to store
 * their buffer and their current state in case they need to be
 * called more than once for a given object type (i.e. ARC, PAL and IFO).
 *--------------------------------------------------------------------*/

typedef struct AVCE00GenInfo_t
{
    char        *pszBuf;
    int         nBufSize;
    
    int         nPrecision;     /* AVC_SINGLE/DOUBLE_PREC       */
    int         iCurItem;
    int         numItems;
}AVCE00GenInfo;

/*---------------------------------------------------------------------
 * Stuff related to the parsing of E00
 *--------------------------------------------------------------------*/

/*---------------------------------------------------------------------
 *                        AVCE00ParseInfo structure
 * This structure is used by the E00 parser functions to store
 * their buffer and their current state while parsing an object.
 *--------------------------------------------------------------------*/

typedef struct AVCE00ParseInfo_t
{
    AVCFileType eFileType;
    int         nPrecision;     /* AVC_SINGLE/DOUBLE_PREC       */
    int         iCurItem;
    int         numItems;
    int         nStartLineNum;
    int         nCurLineNum;

    int         nCurObjectId;
    GBool       bForceEndOfSection;  /* For sections that don't have an */
                                     /* explicit end-of-section line.   */
    AVCFileType eSuperSectionType;/* For sections containing several files*/
    char        *pszSectionHdrLine;  /* Used by supersection types      */

    union
    {
        AVCTableDef  *psTableDef;
    }hdr;
    GBool       bTableHdrComplete;   /* FALSE until table header is */
                                     /* finished parsing */
    int         nTableE00RecLength;

    /* cur.* : temp. storage used to store current object (ARC, PAL, ... or 
     *         Table record) from the file.
     */
    union
    {
        AVCArc       *psArc;
        AVCPal       *psPal;
        AVCCnt       *psCnt;
        AVCLab       *psLab;
        AVCTol       *psTol;
        AVCTxt       *psTxt;
        AVCRxp       *psRxp;
        AVCField     *pasFields;
        char         **papszPrj;
    }cur;

    char        *pszBuf;        /* Buffer used only for TABLEs  */
    int         nBufSize;
}AVCE00ParseInfo;


/*---------------------------------------------------------------------
 * Stuff related to the transparent binary -> E00 conversion
 *--------------------------------------------------------------------*/
typedef struct AVCE00Section_t
{
    AVCFileType eType;        /* File Type                      */
    char        *pszName;     /* E00 section or Table Name      */
    char        *pszFilename; /* Binary/E00 file filename       */
    int         nLineNum;     /* E00 line number                */
    int         nFeatureCount;
}AVCE00Section;

typedef struct AVCE00ReadInfo_t
{
    char        *pszCoverPath;
    char        *pszInfoPath;
    char        *pszCoverName;
    AVCCoverType eCoverType;

    /* pasSections is built when the coverage is opened and describes
     * the squeleton of the E00 file.
     */
    AVCE00Section *pasSections;
    int            numSections;

    /* If bReadAllSections=TRUE then reading automatically continues to
     * the next section when a section finishes. (This is the default)
     * Otherwise, you can use AVCE00ReadGotoSection() to read one section
     * at a time... this will set bReadAllSections=FALSE.
     */ 
    GBool         bReadAllSections;

    /* Info about the file (or E00 section) currently being processed
     */
    int           iCurSection;
    AVCBinFile    *hFile;

    int           iCurStep;  /* AVC_GEN_* values, see below */
    AVCE00GenInfo *hGenInfo;

    /* Info related to multibyte character encoding
     */
    AVCDBCSInfo *psDBCSInfo;

} *AVCE00ReadPtr;