if() [2/9]

if

(

bBigEndian

)

Definition at line 1658 of file shpopen.c.

    {
        int32           nPoints, nParts;
        int32           i, nOffset;
 
        if ( 40 + 8 + 4 > nEntitySize )
        {
            snprintf(szErrorMsg, sizeof(szErrorMsg),
                     "Corrupted .shp file : shape %d : nEntitySize = %d",
                     hEntity, nEntitySize);
            psSHP->sHooks.Error( szErrorMsg );
            SHPDestroyObject(psShape);
            return NULL;
        }
/* -------------------------------------------------------------------- */
/*      Get the X/Y bounds.                                             */
/* -------------------------------------------------------------------- */
        memcpy( &(psShape->dfXMin), psSHP->pabyRec + 8 +  4, 8 );
        memcpy( &(psShape->dfYMin), psSHP->pabyRec + 8 + 12, 8 );
        memcpy( &(psShape->dfXMax), psSHP->pabyRec + 8 + 20, 8 );
        memcpy( &(psShape->dfYMax), psSHP->pabyRec + 8 + 28, 8 );
 
        if( bBigEndian ) SwapWord( 8, &(psShape->dfXMin) );
        if( bBigEndian ) SwapWord( 8, &(psShape->dfYMin) );
        if( bBigEndian ) SwapWord( 8, &(psShape->dfXMax) );
        if( bBigEndian ) SwapWord( 8, &(psShape->dfYMax) );
 
/* -------------------------------------------------------------------- */
/*      Extract part/point count, and build vertex and part arrays      */
/*      to proper size.                                                 */
/* -------------------------------------------------------------------- */
        memcpy( &nPoints, psSHP->pabyRec + 40 + 8, 4 );
        memcpy( &nParts, psSHP->pabyRec + 36 + 8, 4 );
 
        if( bBigEndian ) SwapWord( 4, &nPoints );
        if( bBigEndian ) SwapWord( 4, &nParts );
 
        if (nPoints > 50 * 1000 * 1000 || nParts > 10 * 1000 * 1000)
        {
            snprintf(szErrorMsg, sizeof(szErrorMsg),
                     "Corrupted .shp file : shape %d, nPoints=%d, nParts=%d.",
                     hEntity, nPoints, nParts);
            psSHP->sHooks.Error( szErrorMsg );
            SHPDestroyObject(psShape);
            return NULL;
        }
 
        /* With the previous checks on nPoints and nParts, */
        /* we should not overflow here and after */
        /* since 50 M * (16 + 8 + 8) = 1 600 MB */
        nRequiredSize = 44 + 8 + 4 * nParts + 16 * nPoints;
        if ( psShape->nSHPType == SHPT_POLYGONZ
             || psShape->nSHPType == SHPT_ARCZ
             || psShape->nSHPType == SHPT_MULTIPATCH )
        {
            nRequiredSize += 16 + 8 * nPoints;
        }
        if( psShape->nSHPType == SHPT_MULTIPATCH )
        {
            nRequiredSize += 4 * nParts;
        }
        if (nRequiredSize > nEntitySize)
        {
            snprintf(szErrorMsg, sizeof(szErrorMsg),
                     "Corrupted .shp file : shape %d, nPoints=%d, nParts=%d, nEntitySize=%d.",
                     hEntity, nPoints, nParts, nEntitySize);
            psSHP->sHooks.Error( szErrorMsg );
            SHPDestroyObject(psShape);
            return NULL;
        }
 
        psShape->nVertices = nPoints;
        psShape->padfX = (double *) calloc(nPoints,sizeof(double));
        psShape->padfY = (double *) calloc(nPoints,sizeof(double));
        psShape->padfZ = (double *) calloc(nPoints,sizeof(double));
        psShape->padfM = (double *) calloc(nPoints,sizeof(double));
 
        psShape->nParts = nParts;
        psShape->panPartStart = (int *) calloc(nParts,sizeof(int));
        psShape->panPartType = (int *) calloc(nParts,sizeof(int));
 
        if (psShape->padfX == NULL ||
            psShape->padfY == NULL ||
            psShape->padfZ == NULL ||
            psShape->padfM == NULL ||
            psShape->panPartStart == NULL ||
            psShape->panPartType == NULL)
        {
            snprintf(szErrorMsg, sizeof(szErrorMsg),
                     "Not enough memory to allocate requested memory (nPoints=%d, nParts=%d) for shape %d. "
                     "Probably broken SHP file", hEntity, nPoints, nParts );
            psSHP->sHooks.Error( szErrorMsg );
            SHPDestroyObject(psShape);
            return NULL;
        }
 
        for( i = 0; i < nParts; i++ )
            psShape->panPartType[i] = SHPP_RING;
 
/* -------------------------------------------------------------------- */
/*      Copy out the part array from the record.                        */
/* -------------------------------------------------------------------- */
        memcpy( psShape->panPartStart, psSHP->pabyRec + 44 + 8, 4 * nParts );
        for( i = 0; i < nParts; i++ )
        {
            if( bBigEndian ) SwapWord( 4, psShape->panPartStart+i );
 
            /* We check that the offset is inside the vertex array */
            if (psShape->panPartStart[i] < 0
                || (psShape->panPartStart[i] >= psShape->nVertices
                    && psShape->nVertices > 0) )
            {
                snprintf(szErrorMsg, sizeof(szErrorMsg),
                         "Corrupted .shp file : shape %d : panPartStart[%d] = %d, nVertices = %d",
                         hEntity, i, psShape->panPartStart[i], psShape->nVertices);
                psSHP->sHooks.Error( szErrorMsg );
                SHPDestroyObject(psShape);
                return NULL;
            }
            if (i > 0 && psShape->panPartStart[i] <= psShape->panPartStart[i-1])
            {
                snprintf(szErrorMsg, sizeof(szErrorMsg),
                         "Corrupted .shp file : shape %d : panPartStart[%d] = %d, panPartStart[%d] = %d",
                         hEntity, i, psShape->panPartStart[i], i - 1, psShape->panPartStart[i - 1]);
                psSHP->sHooks.Error( szErrorMsg );
                SHPDestroyObject(psShape);
                return NULL;
            }
        }
 
        nOffset = 44 + 8 + 4*nParts;
 
/* -------------------------------------------------------------------- */
/*      If this is a multipatch, we will also have parts types.         */
/* -------------------------------------------------------------------- */
        if( psShape->nSHPType == SHPT_MULTIPATCH )
        {
            memcpy( psShape->panPartType, psSHP->pabyRec + nOffset, 4*nParts );
            for( i = 0; i < nParts; i++ )
            {
                if( bBigEndian ) SwapWord( 4, psShape->panPartType+i );
            }
 
            nOffset += 4*nParts;
        }
 
/* -------------------------------------------------------------------- */
/*      Copy out the vertices from the record.                          */
/* -------------------------------------------------------------------- */
        for( i = 0; i < nPoints; i++ )
        {
            memcpy(psShape->padfX + i,
                   psSHP->pabyRec + nOffset + i * 16,
                   8 );
 
            memcpy(psShape->padfY + i,
                   psSHP->pabyRec + nOffset + i * 16 + 8,
                   8 );
 
            if( bBigEndian ) SwapWord( 8, psShape->padfX + i );
            if( bBigEndian ) SwapWord( 8, psShape->padfY + i );
        }
 
        nOffset += 16*nPoints;
 
/* -------------------------------------------------------------------- */
/*      If we have a Z coordinate, collect that now.                    */
/* -------------------------------------------------------------------- */
        if( psShape->nSHPType == SHPT_POLYGONZ
            || psShape->nSHPType == SHPT_ARCZ
            || psShape->nSHPType == SHPT_MULTIPATCH )
        {
            memcpy( &(psShape->dfZMin), psSHP->pabyRec + nOffset, 8 );
            memcpy( &(psShape->dfZMax), psSHP->pabyRec + nOffset + 8, 8 );
 
            if( bBigEndian ) SwapWord( 8, &(psShape->dfZMin) );
            if( bBigEndian ) SwapWord( 8, &(psShape->dfZMax) );
 
            for( i = 0; i < nPoints; i++ )
            {
                memcpy( psShape->padfZ + i,
                        psSHP->pabyRec + nOffset + 16 + i*8, 8 );
                if( bBigEndian ) SwapWord( 8, psShape->padfZ + i );
            }
 
            nOffset += 16 + 8*nPoints;
        }
 
/* -------------------------------------------------------------------- */
/*      If we have a M measure value, then read it now.  We assume      */
/*      that the measure can be present for any shape if the size is    */
/*      big enough, but really it will only occur for the Z shapes      */
/*      (options), and the M shapes.                                    */
/* -------------------------------------------------------------------- */
        if( nEntitySize >= nOffset + 16 + 8*nPoints )
        {
            memcpy( &(psShape->dfMMin), psSHP->pabyRec + nOffset, 8 );
            memcpy( &(psShape->dfMMax), psSHP->pabyRec + nOffset + 8, 8 );
 
            if( bBigEndian ) SwapWord( 8, &(psShape->dfMMin) );
            if( bBigEndian ) SwapWord( 8, &(psShape->dfMMax) );
 
            for( i = 0; i < nPoints; i++ )
            {
                memcpy( psShape->padfM + i,
                        psSHP->pabyRec + nOffset + 16 + i*8, 8 );
                if( bBigEndian ) SwapWord( 8, psShape->padfM + i );
            }
            psShape->bMeasureIsUsed = TRUE;
        }
    }