Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Purpose:  Block directory API.
       4             :  *
       5             :  ******************************************************************************
       6             :  * Copyright (c) 2011
       7             :  * PCI Geomatics, 90 Allstate Parkway, Markham, Ontario, Canada.
       8             :  *
       9             :  * Permission is hereby granted, free of charge, to any person obtaining a
      10             :  * copy of this software and associated documentation files (the "Software"),
      11             :  * to deal in the Software without restriction, including without limitation
      12             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      13             :  * and/or sell copies of the Software, and to permit persons to whom the
      14             :  * Software is furnished to do so, subject to the following conditions:
      15             :  *
      16             :  * The above copyright notice and this permission notice shall be included
      17             :  * in all copies or substantial portions of the Software.
      18             :  *
      19             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
      20             :  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      21             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      22             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      23             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      24             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      25             :  * DEALINGS IN THE SOFTWARE.
      26             :  ****************************************************************************/
      27             : 
      28             : #include "blockdir/binarytilelayer.h"
      29             : #include "blockdir/blockfile.h"
      30             : #include "core/pcidsk_utils.h"
      31             : #include "pcidsk_exception.h"
      32             : #include <algorithm>
      33             : #include <limits>
      34             : 
      35             : using namespace PCIDSK;
      36             : 
      37             : /************************************************************************/
      38             : /*                            BinaryTileLayer()                         */
      39             : /************************************************************************/
      40             : 
      41             : /**
      42             :  * Constructor.
      43             :  *
      44             :  * @param poBlockDir The associated block directory.
      45             :  * @param nLayer The index of the block layer.
      46             :  * @param psBlockLayer The block layer info.
      47             :  * @param psTileLayer The tile layer info.
      48             :  */
      49          27 : BinaryTileLayer::BinaryTileLayer(BlockDir * poBlockDir, uint32 nLayer,
      50             :                                  BlockLayerInfo * psBlockLayer,
      51          27 :                                  TileLayerInfo * psTileLayer)
      52          27 :     : BlockTileLayer(poBlockDir, nLayer, psBlockLayer, psTileLayer)
      53             : {
      54          27 : }
      55             : 
      56             : /************************************************************************/
      57             : /*                             WriteTileList()                          */
      58             : /************************************************************************/
      59             : 
      60             : /**
      61             :  * Writes the tile list to disk.
      62             :  */
      63          12 : void BinaryTileLayer::WriteTileList(void)
      64             : {
      65          24 :     BlockTileInfoList oTileList = moTileList;
      66             : 
      67          12 :     SwapBlockTile(&oTileList.front(), oTileList.size());
      68             : 
      69          12 :     WriteToLayer(&oTileList.front(), 0,
      70          12 :                  oTileList.size() * sizeof(BlockTileInfo));
      71          12 : }
      72             : 
      73             : /************************************************************************/
      74             : /*                              ReadTileList()                          */
      75             : /************************************************************************/
      76             : 
      77             : /**
      78             :  * Reads the tile list from disk.
      79             :  */
      80           7 : void BinaryTileLayer::ReadTileList(void)
      81             : {
      82           7 :     uint32 nTileCount = GetTileCount();
      83             : 
      84           7 :     uint64 nSize = static_cast<uint64>(nTileCount) * sizeof(BlockTileInfo);
      85             : 
      86           7 :     if (nSize > GetLayerSize() || !GetFile()->IsValidFileOffset(nSize))
      87           0 :         return ThrowPCIDSKException("The tile layer is corrupted.");
      88             : 
      89             : #if SIZEOF_VOIDP < 8
      90             :     if (nSize > std::numeric_limits<size_t>::max())
      91             :         return ThrowPCIDSKException("Unable to read extremely large tile layer on 32-bit system.");
      92             : #endif
      93             : 
      94             :     try
      95             :     {
      96           7 :         moTileList.resize(nTileCount);
      97             :     }
      98           0 :     catch (const std::exception & ex)
      99             :     {
     100           0 :         return ThrowPCIDSKException("Out of memory in BinaryTileDir::ReadTileList(): %s", ex.what());
     101             :     }
     102             : 
     103           7 :     ReadFromLayer(&moTileList.front(), 0,
     104           7 :                   moTileList.size() * sizeof(BlockTileInfo));
     105             : 
     106           7 :     SwapBlockTile(&moTileList.front(), moTileList.size());
     107             : }
     108             : 
     109             : /************************************************************************/
     110             : /*                             SwapBlockTile()                          */
     111             : /************************************************************************/
     112             : 
     113             : /**
     114             :  * Swaps the specified block tile info array.
     115             :  *
     116             :  * @param psTile The block tile info array to swap.
     117             :  * @param nCount The number of block tile info.
     118             :  */
     119          19 : void BinaryTileLayer::SwapBlockTile(BlockTileInfo * psTile, size_t nCount)
     120             : {
     121          19 :     if (!mpoBlockDir->NeedsSwap())
     122          19 :         return;
     123             : 
     124           0 :     for (BlockTileInfo * psEnd = psTile + nCount;
     125           0 :          psTile < psEnd; psTile++)
     126             :     {
     127           0 :         SwapData(&psTile->nOffset, 8, 1);
     128           0 :         SwapData(&psTile->nSize, 4, 1);
     129             :     }
     130             : }