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|
/******************************************************************************
* $Id$
*
* Project: Arc/Info Binary Grid Translator
* Purpose: Grid file access cover API for non-GDAL use.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 1999, Frank Warmerdam
* Copyright (c) 2009-2010, Even Rouault <even dot rouault at spatialys.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
****************************************************************************/
#include "aigrid.h"
CPL_INLINE static void CPL_IGNORE_RET_VAL_INT(CPL_UNUSED int unused)
{
}
/************************************************************************/
/* AIGOpen() */
/************************************************************************/
AIGInfo_t *AIGOpen(const char *pszInputName, const char *pszAccess)
{
AIGInfo_t *psInfo;
char *pszCoverName;
(void)pszAccess;
/* -------------------------------------------------------------------- */
/* If the pass name ends in .adf assume a file within the */
/* coverage has been selected, and strip that off the coverage */
/* name. */
/* -------------------------------------------------------------------- */
pszCoverName = CPLStrdup(pszInputName);
if (EQUAL(pszCoverName + strlen(pszCoverName) - 4, ".adf"))
{
int i;
for (i = (int)strlen(pszCoverName) - 1; i > 0; i--)
{
if (pszCoverName[i] == '\\' || pszCoverName[i] == '/')
{
pszCoverName[i] = '\0';
break;
}
}
if (i == 0)
strcpy(pszCoverName, ".");
}
/* -------------------------------------------------------------------- */
/* Allocate info structure. */
/* -------------------------------------------------------------------- */
psInfo = (AIGInfo_t *)CPLCalloc(sizeof(AIGInfo_t), 1);
psInfo->bHasWarned = FALSE;
psInfo->nFailedOpenings = 0;
psInfo->pszCoverName = pszCoverName;
/* -------------------------------------------------------------------- */
/* Read the header file. */
/* -------------------------------------------------------------------- */
if (AIGReadHeader(pszCoverName, psInfo) != CE_None)
{
CPLFree(pszCoverName);
CPLFree(psInfo);
return NULL;
}
/* -------------------------------------------------------------------- */
/* Read the extents. */
/* -------------------------------------------------------------------- */
if (AIGReadBounds(pszCoverName, psInfo) != CE_None)
{
AIGClose(psInfo);
return NULL;
}
/* -------------------------------------------------------------------- */
/* Compute the number of pixels and lines, and the number of */
/* tile files. */
/* -------------------------------------------------------------------- */
if (psInfo->dfCellSizeX <= 0 || psInfo->dfCellSizeY <= 0)
{
CPLError(CE_Failure, CPLE_AppDefined, "Illegal cell size : %f x %f",
psInfo->dfCellSizeX, psInfo->dfCellSizeY);
AIGClose(psInfo);
return NULL;
}
psInfo->nPixels =
(int)((psInfo->dfURX - psInfo->dfLLX + 0.5 * psInfo->dfCellSizeX) /
psInfo->dfCellSizeX);
psInfo->nLines =
(int)((psInfo->dfURY - psInfo->dfLLY + 0.5 * psInfo->dfCellSizeY) /
psInfo->dfCellSizeY);
if (psInfo->nPixels <= 0 || psInfo->nLines <= 0)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Invalid raster dimensions : %d x %d", psInfo->nPixels,
psInfo->nLines);
AIGClose(psInfo);
return NULL;
}
if (psInfo->nBlockXSize <= 0 || psInfo->nBlockYSize <= 0 ||
psInfo->nBlocksPerRow <= 0 || psInfo->nBlocksPerColumn <= 0 ||
psInfo->nBlockXSize > INT_MAX / psInfo->nBlocksPerRow ||
psInfo->nBlockYSize > INT_MAX / psInfo->nBlocksPerColumn)
{
CPLError(CE_Failure, CPLE_AppDefined,
"Invalid block characteristics: nBlockXSize=%d, "
"nBlockYSize=%d, nBlocksPerRow=%d, nBlocksPerColumn=%d",
psInfo->nBlockXSize, psInfo->nBlockYSize,
psInfo->nBlocksPerRow, psInfo->nBlocksPerColumn);
AIGClose(psInfo);
return NULL;
}
if (psInfo->nBlocksPerRow > INT_MAX / psInfo->nBlocksPerColumn)
{
CPLError(CE_Failure, CPLE_OutOfMemory, "Too many blocks");
AIGClose(psInfo);
return NULL;
}
psInfo->nTileXSize = psInfo->nBlockXSize * psInfo->nBlocksPerRow;
psInfo->nTileYSize = psInfo->nBlockYSize * psInfo->nBlocksPerColumn;
psInfo->nTilesPerRow = (psInfo->nPixels - 1) / psInfo->nTileXSize + 1;
psInfo->nTilesPerColumn = (psInfo->nLines - 1) / psInfo->nTileYSize + 1;
/* Each tile map to a file and there are only 3 characters in the */
/* filename for the X and Y components. */
if (psInfo->nTilesPerRow > 1000 * 1000 / psInfo->nTilesPerColumn)
{
CPLError(CE_Failure, CPLE_AppDefined, "Too many tiles");
psInfo->nTilesPerRow = 0; /* to avoid int32 overflow in AIGClose() */
psInfo->nTilesPerColumn = 0;
AIGClose(psInfo);
return NULL;
}
/* -------------------------------------------------------------------- */
/* Setup tile infos, but defer reading of tile data. */
/* -------------------------------------------------------------------- */
psInfo->pasTileInfo = (AIGTileInfo *)VSI_CALLOC_VERBOSE(
sizeof(AIGTileInfo), psInfo->nTilesPerRow * psInfo->nTilesPerColumn);
if (psInfo->pasTileInfo == NULL)
{
AIGClose(psInfo);
return NULL;
}
/* -------------------------------------------------------------------- */
/* Read the statistics. */
/* -------------------------------------------------------------------- */
if (AIGReadStatistics(pszCoverName, psInfo) != CE_None)
{
AIGClose(psInfo);
return NULL;
}
return (psInfo);
}
/************************************************************************/
/* AIGAccessTile() */
/************************************************************************/
CPLErr AIGAccessTile(AIGInfo_t *psInfo, int iTileX, int iTileY)
{
char szBasename[32];
char *pszFilename;
AIGTileInfo *psTInfo;
const size_t nFilenameLen = strlen(psInfo->pszCoverName) + 40;
/* -------------------------------------------------------------------- */
/* Identify our tile. */
/* -------------------------------------------------------------------- */
if (iTileX < 0 || iTileX >= psInfo->nTilesPerRow || iTileY < 0 ||
iTileY >= psInfo->nTilesPerColumn)
{
CPLAssert(FALSE);
return CE_Failure;
}
psTInfo = psInfo->pasTileInfo + iTileX + iTileY * psInfo->nTilesPerRow;
if (psTInfo->fpGrid != NULL)
return psTInfo->panBlockOffset != NULL ? CE_None : CE_Failure;
if (psTInfo->bTriedToLoad)
return CE_None;
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
/* After a significant number of failed openings, don't even try further */
if (psInfo->nFailedOpenings == 1000)
return CE_None;
#endif
/* -------------------------------------------------------------------- */
/* Compute the basename. */
/* -------------------------------------------------------------------- */
if (iTileY == 0)
snprintf(szBasename, sizeof(szBasename), "w%03d001", iTileX + 1);
else if (iTileY == 1)
snprintf(szBasename, sizeof(szBasename), "w%03d000", iTileX + 1);
else
snprintf(szBasename, sizeof(szBasename), "z%03d%03d", iTileX + 1,
iTileY - 1);
/* -------------------------------------------------------------------- */
/* Open the file w001001.adf file itself. */
/* -------------------------------------------------------------------- */
pszFilename = (char *)CPLMalloc(nFilenameLen);
snprintf(pszFilename, nFilenameLen, "%s/%s.adf", psInfo->pszCoverName,
szBasename);
psTInfo->fpGrid = AIGLLOpen(pszFilename, "rb");
psTInfo->bTriedToLoad = TRUE;
if (psTInfo->fpGrid == NULL)
{
psInfo->nFailedOpenings++;
if (psInfo->nFailedOpenings < 100)
{
CPLError(
CE_Warning, CPLE_OpenFailed,
"Failed to open grid file, assuming region is nodata:\n%s\n",
pszFilename);
}
CPLFree(pszFilename);
return CE_Warning;
}
CPLFree(pszFilename);
pszFilename = NULL;
/* -------------------------------------------------------------------- */
/* Read the block index file. */
/* -------------------------------------------------------------------- */
return AIGReadBlockIndex(psInfo, psTInfo, szBasename);
}
/************************************************************************/
/* AIGReadTile() */
/************************************************************************/
CPLErr AIGReadTile(AIGInfo_t *psInfo, int nBlockXOff, int nBlockYOff,
GInt32 *panData)
{
int nBlockID;
CPLErr eErr;
int iTileX, iTileY;
AIGTileInfo *psTInfo;
/* -------------------------------------------------------------------- */
/* Compute our tile, and ensure it is accessible (open). Then */
/* reduce block x/y values to be the block within that tile. */
/* -------------------------------------------------------------------- */
iTileX = nBlockXOff / psInfo->nBlocksPerRow;
iTileY = nBlockYOff / psInfo->nBlocksPerColumn;
eErr = AIGAccessTile(psInfo, iTileX, iTileY);
if (eErr == CE_Failure)
return eErr;
psTInfo = psInfo->pasTileInfo + iTileX + iTileY * psInfo->nTilesPerRow;
nBlockXOff -= iTileX * psInfo->nBlocksPerRow;
nBlockYOff -= iTileY * psInfo->nBlocksPerColumn;
/* -------------------------------------------------------------------- */
/* Request for tile from a file which does not exist - treat as */
/* all nodata. */
/* -------------------------------------------------------------------- */
if (psTInfo->fpGrid == NULL)
{
int i;
for (i = psInfo->nBlockXSize * psInfo->nBlockYSize - 1; i >= 0; i--)
panData[i] = ESRI_GRID_NO_DATA;
return CE_None;
}
/* -------------------------------------------------------------------- */
/* validate block id. */
/* -------------------------------------------------------------------- */
nBlockID = nBlockXOff + nBlockYOff * psInfo->nBlocksPerRow;
if (nBlockID < 0 ||
nBlockID >= psInfo->nBlocksPerRow * psInfo->nBlocksPerColumn)
{
CPLError(CE_Failure, CPLE_AppDefined, "Illegal block requested.");
return CE_Failure;
}
if (nBlockID >= psTInfo->nBlocks)
{
int i;
CPLDebug("AIG",
"Request legal block, but from beyond end of block map.\n"
"Assuming all nodata.");
for (i = psInfo->nBlockXSize * psInfo->nBlockYSize - 1; i >= 0; i--)
panData[i] = ESRI_GRID_NO_DATA;
return CE_None;
}
/* -------------------------------------------------------------------- */
/* Read block. */
/* -------------------------------------------------------------------- */
eErr = AIGReadBlock(psTInfo->fpGrid, psTInfo->panBlockOffset[nBlockID],
psTInfo->panBlockSize[nBlockID], psInfo->nBlockXSize,
psInfo->nBlockYSize, panData, psInfo->nCellType,
psInfo->bCompressed);
/* -------------------------------------------------------------------- */
/* Apply floating point post-processing. */
/* -------------------------------------------------------------------- */
if (eErr == CE_None && psInfo->nCellType == AIG_CELLTYPE_FLOAT)
{
float *pafData = (float *)panData;
int i, nPixels = psInfo->nBlockXSize * psInfo->nBlockYSize;
for (i = 0; i < nPixels; i++)
{
panData[i] = (int)pafData[i];
}
}
return (eErr);
}
/************************************************************************/
/* AIGReadFloatTile() */
/************************************************************************/
CPLErr AIGReadFloatTile(AIGInfo_t *psInfo, int nBlockXOff, int nBlockYOff,
float *pafData)
{
int nBlockID;
CPLErr eErr;
int iTileX, iTileY;
AIGTileInfo *psTInfo;
/* -------------------------------------------------------------------- */
/* Compute our tile, and ensure it is accessible (open). Then */
/* reduce block x/y values to be the block within that tile. */
/* -------------------------------------------------------------------- */
iTileX = nBlockXOff / psInfo->nBlocksPerRow;
iTileY = nBlockYOff / psInfo->nBlocksPerColumn;
eErr = AIGAccessTile(psInfo, iTileX, iTileY);
if (eErr == CE_Failure)
return eErr;
psTInfo = psInfo->pasTileInfo + iTileX + iTileY * psInfo->nTilesPerRow;
nBlockXOff -= iTileX * psInfo->nBlocksPerRow;
nBlockYOff -= iTileY * psInfo->nBlocksPerColumn;
/* -------------------------------------------------------------------- */
/* Request for tile from a file which does not exist - treat as */
/* all nodata. */
/* -------------------------------------------------------------------- */
if (psTInfo->fpGrid == NULL)
{
int i;
for (i = psInfo->nBlockXSize * psInfo->nBlockYSize - 1; i >= 0; i--)
pafData[i] = ESRI_GRID_FLOAT_NO_DATA;
return CE_None;
}
/* -------------------------------------------------------------------- */
/* validate block id. */
/* -------------------------------------------------------------------- */
nBlockID = nBlockXOff + nBlockYOff * psInfo->nBlocksPerRow;
if (nBlockID < 0 ||
nBlockID >= psInfo->nBlocksPerRow * psInfo->nBlocksPerColumn)
{
CPLError(CE_Failure, CPLE_AppDefined, "Illegal block requested.");
return CE_Failure;
}
if (nBlockID >= psTInfo->nBlocks)
{
int i;
CPLDebug("AIG",
"Request legal block, but from beyond end of block map.\n"
"Assuming all nodata.");
for (i = psInfo->nBlockXSize * psInfo->nBlockYSize - 1; i >= 0; i--)
pafData[i] = ESRI_GRID_FLOAT_NO_DATA;
return CE_None;
}
/* -------------------------------------------------------------------- */
/* Read block. */
/* -------------------------------------------------------------------- */
eErr = AIGReadBlock(psTInfo->fpGrid, psTInfo->panBlockOffset[nBlockID],
psTInfo->panBlockSize[nBlockID], psInfo->nBlockXSize,
psInfo->nBlockYSize, (GInt32 *)pafData,
psInfo->nCellType, psInfo->bCompressed);
/* -------------------------------------------------------------------- */
/* Perform integer post processing. */
/* -------------------------------------------------------------------- */
if (eErr == CE_None && psInfo->nCellType == AIG_CELLTYPE_INT)
{
GUInt32 *panData = (GUInt32 *)pafData;
int i, nPixels = psInfo->nBlockXSize * psInfo->nBlockYSize;
for (i = 0; i < nPixels; i++)
{
pafData[i] = (float)panData[i];
}
}
return (eErr);
}
/************************************************************************/
/* AIGClose() */
/************************************************************************/
void AIGClose(AIGInfo_t *psInfo)
{
if (psInfo->pasTileInfo != NULL)
{
int nTileCount = psInfo->nTilesPerRow * psInfo->nTilesPerColumn;
int iTile;
for (iTile = 0; iTile < nTileCount; iTile++)
{
if (psInfo->pasTileInfo[iTile].fpGrid)
{
CPL_IGNORE_RET_VAL_INT(
VSIFCloseL(psInfo->pasTileInfo[iTile].fpGrid));
CPLFree(psInfo->pasTileInfo[iTile].panBlockOffset);
CPLFree(psInfo->pasTileInfo[iTile].panBlockSize);
}
}
}
CPLFree(psInfo->pasTileInfo);
CPLFree(psInfo->pszCoverName);
CPLFree(psInfo);
}
/************************************************************************/
/* AIGLLOpen() */
/* */
/* Low level fopen() replacement that will try provided, and */
/* upper cased versions of file names. */
/************************************************************************/
VSILFILE *AIGLLOpen(const char *pszFilename, const char *pszAccess)
{
VSILFILE *fp;
fp = VSIFOpenL(pszFilename, pszAccess);
if (fp == NULL)
{
char *pszUCFilename = CPLStrdup(pszFilename);
int i;
for (i = (int)strlen(pszUCFilename) - 1;
pszUCFilename[i] != '/' && pszUCFilename[i] != '\\'; i--)
{
pszUCFilename[i] = (char)toupper(pszUCFilename[i]);
}
fp = VSIFOpenL(pszUCFilename, pszAccess);
CPLFree(pszUCFilename);
}
return fp;
}
|
