avc_e00parse.c

用于读取TAB、MIF、SHP文件的类

             *--------------------------------------------------------*/
            psInfo->iCurItem = 0;
            psInfo->numItems = numFixedLines + ((psTxt->numChars-1)/80 + 1);

        }
    }
    else if (psInfo->iCurItem < psInfo->numItems &&
             psInfo->iCurItem < numFixedLines-1 && nLen >=63)
    {
        /*-------------------------------------------------------------
         * Then we have a set of 15 coordinate values... unused ones
         * are present but are set to 0.00E+00
         *
         * Vals 1 to 4 are X coords of line along which text is drawn
         * Vals 5 to 8 are the corresponding Y coords
         * Vals 9 to 11 are the X coords of the text arrow
         * Vals 12 to 14 are the corresponding Y coords
         * The 15th value is the height
         *
         * Note that the first vertex (values 1 and 5) is duplicated
         * in the TXT structure... go wonder why???
         *------------------------------------------------------------*/
        int iCurCoord=0, numCoordPerLine, nItemSize, iVertex;
        if (psInfo->nPrecision == AVC_SINGLE_PREC)
        {
            numCoordPerLine = 5;
            nItemSize = 14;  /* Num of chars for single precision float*/
        }
        else
        {
            numCoordPerLine = 3;
            nItemSize = 21;  /* Num of chars for double precision float*/
        }
        iCurCoord = psInfo->iCurItem * numCoordPerLine;

        for(i=0; i<numCoordPerLine; i++, iCurCoord++)
        {
            if (iCurCoord < 4 && 
                (iVertex = iCurCoord % 4) < psTxt->numVerticesLine-1)
            {
                psTxt->pasVertices[iVertex+1].x = atof(pszLine+i*nItemSize);
                /* The first vertex is always duplicated */
                if (iVertex == 0)
                    psTxt->pasVertices[0].x = psTxt->pasVertices[1].x;
            }
            else if (iCurCoord >= 4 && iCurCoord < 8 &&
                     (iVertex = iCurCoord % 4) < psTxt->numVerticesLine-1)
            {
                psTxt->pasVertices[iVertex+1].y = atof(pszLine+i*nItemSize);
                /* The first vertex is always duplicated */
                if (iVertex == 0)
                    psTxt->pasVertices[0].y = psTxt->pasVertices[1].y;
            }
            else if (iCurCoord >= 8 && iCurCoord < 11 &&
                     (iVertex = (iCurCoord-8) % 3) < psTxt->numVerticesArrow)
            {
                psTxt->pasVertices[iVertex+psTxt->numVerticesLine].x =
                                                    atof(pszLine+i*nItemSize);
            }
            else if (iCurCoord >= 11 && iCurCoord < 14 &&
                     (iVertex = (iCurCoord-8) % 3) < psTxt->numVerticesArrow)
            {
                psTxt->pasVertices[iVertex+psTxt->numVerticesLine].y =
                                                    atof(pszLine+i*nItemSize);
            }
            else if (iCurCoord == 14)
            {
                psTxt->dHeight = atof(pszLine+i*nItemSize);
            }

        }

        psInfo->iCurItem++;
    }
    else if (psInfo->iCurItem < psInfo->numItems &&
             psInfo->iCurItem == numFixedLines-1  && nLen >=14)
    {
        /*-------------------------------------------------------------
         * Line with a -1.000E+02 value, ALWAYS SINGLE PRECISION !!!
         *------------------------------------------------------------*/
        psTxt->f_1e2 = (float)atof(pszLine);

        psInfo->iCurItem++;
    }
    else if (psInfo->iCurItem < psInfo->numItems &&
             psInfo->iCurItem >= numFixedLines)
    {
        /*-------------------------------------------------------------
         * Last line, contains the text string
         * Note that text can be split in 80 chars chunk and that buffer
         * has been previously initialized with spaces and '\0'-terminated
         *------------------------------------------------------------*/
        int numLines, iLine;
        numLines = (psTxt->numChars-1)/80 + 1;
        iLine = numLines - (psInfo->numItems - psInfo->iCurItem);

        if (iLine == numLines-1)
        {
            strncpy(psTxt->pszText+(iLine*80), pszLine, 
                    MIN( nLen, (psTxt->numChars - (iLine*80)) ) );
        }
        else
        {
            strncpy(psTxt->pszText+(iLine*80), pszLine, MIN(nLen, 80));
        }

        psInfo->iCurItem++;
    }
    else
    {
        CPLError(CE_Failure, CPLE_AppDefined, 
                 "Error parsing E00 TXT line: \"%s\"", pszLine);
        psInfo->numItems = psInfo->iCurItem = 0;
        return NULL;
    }

    /*-----------------------------------------------------------------
     * If we're done parsing this TXT, then reset the ParseInfo,
     * and return a reference to the TXT structure
     * Otherwise return NULL, which means that we are expecting more
     * more lines of input.
     *----------------------------------------------------------------*/
    if (psInfo->iCurItem >= psInfo->numItems)
    {
        psInfo->numItems = psInfo->iCurItem = 0;
        return psTxt;
    }

    return NULL;
}


/**********************************************************************
 *                          AVCE00ParseNextTx6Line()
 *
 * Take the next line of E00 input for an TX6/TX7 object and parse it.
 *
 * Returns NULL if the current object is not complete yet (expecting
 * more lines of input) or a reference to a complete object if it
 * is complete.
 *
 * The returned object is a reference to an internal data structure.
 * It should not be modified or freed by the caller.
 *
 * If the input is invalid or other problems happen, then a CPLError()
 * will be generated.  CPLGetLastErrorNo() should be called to check
 * that the line was parsed succesfully.
 **********************************************************************/
AVCTxt   *AVCE00ParseNextTx6Line(AVCE00ParseInfo *psInfo, const char *pszLine)
{
    AVCTxt *psTxt;
    int     i, nLen;

    CPLAssert(psInfo->eFileType == AVCFileTX6);

    psTxt = psInfo->cur.psTxt;

    nLen = strlen(pszLine);

    if (psInfo->numItems == 0)
    {
        /*-------------------------------------------------------------
         * Begin processing a new object, read header line:
         *------------------------------------------------------------*/
        if (nLen < 70)
        {
            CPLError(CE_Failure, CPLE_AppDefined, 
                     "Error parsing E00 TX6/TX7 line: \"%s\"", pszLine);
            return NULL;
        }
        else
        {
            int numVertices;
            /*---------------------------------------------------------
             * System Id is not stored in the E00 file.  Annotations are
             * stored in increasing order of System Id, starting at 1...
             * so we just increment the previous value.
             *--------------------------------------------------------*/
            psTxt->nTxtId = ++psInfo->nCurObjectId;

            psTxt->nUserId         = AVCE00Str2Int(pszLine, 10);
            psTxt->nLevel          = AVCE00Str2Int(pszLine+10, 10);
            psTxt->numVerticesLine = AVCE00Str2Int(pszLine+20, 10);
            psTxt->numVerticesArrow= AVCE00Str2Int(pszLine+30, 10);
            psTxt->nSymbol         = AVCE00Str2Int(pszLine+40, 10);
            psTxt->n28             = AVCE00Str2Int(pszLine+50, 10);
            psTxt->numChars        = AVCE00Str2Int(pszLine+60, 10);

            /*---------------------------------------------------------
             * Realloc the string buffer and array of vertices
             *--------------------------------------------------------*/
            psTxt->pszText = (char *)CPLRealloc(psTxt->pszText,
                                                (psTxt->numChars+1)*
                                                sizeof(char));

            numVertices = ABS(psTxt->numVerticesLine) + 
                                 ABS(psTxt->numVerticesArrow);
            if (numVertices > 0)
                psTxt->pasVertices = (AVCVertex*)CPLRealloc(psTxt->pasVertices,
                                              numVertices*sizeof(AVCVertex));

            /*---------------------------------------------------------
             * Fill the whole string buffer with spaces we'll just
             * paste lines in it using strncpy()
             *--------------------------------------------------------*/
            memset(psTxt->pszText, ' ', psTxt->numChars);
            psTxt->pszText[psTxt->numChars] = '\0';

            /*---------------------------------------------------------
             * psInfo->iCurItem is the index of the last line that was read.
             * psInfo->numItems is the number of lines to read.
             *--------------------------------------------------------*/
            psInfo->iCurItem = 0;
            psInfo->numItems = 8 + numVertices + ((psTxt->numChars-1)/80 + 1);
        }
    }
    else if (psInfo->iCurItem < psInfo->numItems && 
             psInfo->iCurItem < 6 && nLen >=60)
    {
        /*-------------------------------------------------------------
         * Text Justification stuff... 2 sets of 20 int16 values.
         *------------------------------------------------------------*/
        GInt16  *pValue;
        int     numValPerLine=7;

        if (psInfo->iCurItem < 3)
            pValue = psTxt->anJust2 + psInfo->iCurItem * 7;
        else
            pValue = psTxt->anJust1 + (psInfo->iCurItem-3) * 7;

        /* Last line of each set contains only 6 values instead of 7 */
        if (psInfo->iCurItem == 2 || psInfo->iCurItem == 5)
            numValPerLine = 6;

        for(i=0; i<numValPerLine; i++)
            pValue[i] = AVCE00Str2Int(pszLine + i*10, 10);

        psInfo->iCurItem++;
    }
    else if (psInfo->iCurItem < psInfo->numItems && 
             psInfo->iCurItem == 6 && nLen >=14)
    {
        /*-------------------------------------------------------------
         * Line with a -1.000E+02 value, ALWAYS SINGLE PRECISION !!!
         *------------------------------------------------------------*/
        psTxt->f_1e2 = (float)atof(pszLine);
        psInfo->iCurItem++;
    }
    else if (psInfo->iCurItem < psInfo->numItems && 
             psInfo->iCurItem == 7 && nLen >=42)
    {
        /*-------------------------------------------------------------
         * Line with 3 values, 1st value is text height.
         *------------------------------------------------------------*/
        psTxt->dHeight = atof(pszLine);
        if (psInfo->nPrecision == AVC_SINGLE_PREC)
        {
            psTxt->dV2     = atof(pszLine+14);
            psTxt->dV3     = atof(pszLine+28);
        }
        else
        {
            psTxt->dV2     = atof(pszLine+21);
            psTxt->dV3     = atof(pszLine+42);
        }

        psInfo->iCurItem++;
    }
    else if (psInfo->iCurItem < (8 + ABS(psTxt->numVerticesLine) + 
                                   ABS(psTxt->numVerticesArrow)) && nLen >= 28)
    {
        /*-------------------------------------------------------------
         * One line for each pair of X,Y coordinates
         * (Lines 8 to 8+numVertices-1)
         *------------------------------------------------------------*/
        psTxt->pasVertices[ psInfo->iCurItem-8 ].x = atof(pszLine);
        if (psInfo->nPrecision == AVC_SINGLE_PREC)
            psTxt->pasVertices[ psInfo->iCurItem-8 ].y = atof(pszLine+14);
        else
            psTxt->pasVertices[ psInfo->iCurItem-8 ].y = atof(pszLine+21);

        psInfo->iCurItem++;
    }
    else if (psInfo->iCurItem < psInfo->numItems)
    {
        /*-------------------------------------------------------------
         * Last line, contains the text string
         * Note that text can be split in 80 chars chunk and that buffer
         * has been previously initialized with spaces and '\0'-terminated
         *------------------------------------------------------------*/
        int numLines, iLine;
        numLines = (psTxt->numChars-1)/80 + 1;
        iLine = numLines - (psInfo->numItems - psInfo->iCurItem);

        if (iLine == numLines-1)
        {
            strncpy(psTxt->pszText+(iLine*80), pszLine, 
                    MIN( nLen, (psTxt->numChars - (iLine*80)) ) );
        }
        else
        {
            strncpy(psTxt->pszText+(iLine*80), pszLine, MIN(nLen, 80));
        }

        psInfo->iCurItem++;
    }
    else
    {
        CPLError(CE_Failure, CPLE_AppDefined, 
                 "Error parsing E00 TX6/TX7 line: \"%s\"", pszLine);
        psInfo->numItems = psInfo->iCurItem = 0;
        return NULL;
    }

    /*-----------------------------------------------------------------
     * If we're done parsing this TX6/TX7, then reset the ParseInfo,
     * and return a reference to the TXT structure
     * Otherwise return NULL, which means that we are expecting more
     * more lines of input.
     *----------------------------------------------------------------*/
    if (psInfo->iCurItem >= psInfo->numItems)
    {
        psInfo->numItems = psInfo->iCurItem = 0;
        return psTxt;
    }

    return NULL;
}



/**********************************************************************
 *                          AVCE00ParseNextRxpLine()
 *
 * Take the next line of E00 input for an RXP object and parse it.
 *
 * Returns NULL if the current object is not complete yet (expecting
 * more lines of input) or a reference to a complete object if it
 * is complete.
 *
 * The returned object is a reference to an internal data structure.
 * It should not be modified or freed by the caller.
 *
 * If the input is invalid or other problems happen, then a CPLError()
 * will be generated.  CPLGetLastErrorNo() should be called to check
 * that the line