Coverage Report

Created: 2025-06-13 06:29

/src/gdal/frmts/gtiff/gtiffsplitband.cpp
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Source (jump to first uncovered line)
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/******************************************************************************
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 *
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 * Project:  GeoTIFF Driver
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 * Purpose:  GDAL GeoTIFF support.
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 * Author:   Frank Warmerdam, warmerdam@pobox.com
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 *
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 ******************************************************************************
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 * Copyright (c) 1998, 2002, Frank Warmerdam <warmerdam@pobox.com>
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 * Copyright (c) 2007-2015, Even Rouault <even dot rouault at spatialys dot com>
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 *
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 * SPDX-License-Identifier: MIT
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 ****************************************************************************/
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#include "gtiffsplitband.h"
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#include "gtiffdataset.h"
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/************************************************************************/
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/*                           GTiffSplitBand()                           */
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/************************************************************************/
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GTiffSplitBand::GTiffSplitBand(GTiffDataset *poDSIn, int nBandIn)
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    : GTiffRasterBand(poDSIn, nBandIn)
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{
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    nBlockXSize = poDS->GetRasterXSize();
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    nBlockYSize = 1;
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}
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/************************************************************************/
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/*                       IGetDataCoverageStatus()                       */
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/************************************************************************/
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int GTiffSplitBand::IGetDataCoverageStatus(int, int, int, int, int, double *)
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{
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    return GDAL_DATA_COVERAGE_STATUS_UNIMPLEMENTED |
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           GDAL_DATA_COVERAGE_STATUS_DATA;
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}
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/************************************************************************/
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/*                             IReadBlock()                             */
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/************************************************************************/
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CPLErr GTiffSplitBand::IReadBlock(int /* nBlockXOff */, int nBlockYOff,
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                                  void *pImage)
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{
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    m_poGDS->Crystalize();
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    // Optimization when reading the same line in a contig multi-band TIFF.
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    if (m_poGDS->m_nPlanarConfig == PLANARCONFIG_CONTIG &&
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        m_poGDS->nBands > 1 && m_poGDS->m_nLoadedBlock == nBlockYOff)
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    {
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        goto extract_band_data;
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    }
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    if (m_poGDS->m_nPlanarConfig == PLANARCONFIG_CONTIG && m_poGDS->nBands > 1)
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    {
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        if (m_poGDS->m_pabyBlockBuf == nullptr)
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        {
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            m_poGDS->m_pabyBlockBuf = static_cast<GByte *>(
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                VSI_MALLOC_VERBOSE(TIFFScanlineSize(m_poGDS->m_hTIFF)));
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            if (m_poGDS->m_pabyBlockBuf == nullptr)
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            {
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                return CE_Failure;
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            }
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        }
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    }
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    else
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    {
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        CPLAssert(TIFFScanlineSize(m_poGDS->m_hTIFF) == nBlockXSize);
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    }
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    /* -------------------------------------------------------------------- */
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    /*      Read through to target scanline.                                */
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    /* -------------------------------------------------------------------- */
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    if (m_poGDS->m_nLoadedBlock >= nBlockYOff)
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        m_poGDS->m_nLoadedBlock = -1;
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    if (m_poGDS->m_nPlanarConfig == PLANARCONFIG_SEPARATE &&
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        m_poGDS->nBands > 1)
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    {
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        // If we change of band, we must start reading the
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        // new strip from its beginning.
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        if (m_poGDS->m_nLastBandRead != nBand)
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            m_poGDS->m_nLoadedBlock = -1;
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        m_poGDS->m_nLastBandRead = nBand;
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    }
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    while (m_poGDS->m_nLoadedBlock < nBlockYOff)
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    {
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        ++m_poGDS->m_nLoadedBlock;
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        if (TIFFReadScanline(m_poGDS->m_hTIFF,
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                             m_poGDS->m_pabyBlockBuf ? m_poGDS->m_pabyBlockBuf
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                                                     : pImage,
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                             m_poGDS->m_nLoadedBlock,
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                             (m_poGDS->m_nPlanarConfig == PLANARCONFIG_SEPARATE)
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                                 ? static_cast<uint16_t>(nBand - 1)
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                                 : 0) == -1 &&
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            !m_poGDS->m_bIgnoreReadErrors)
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        {
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            ReportError(CE_Failure, CPLE_AppDefined,
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                        "TIFFReadScanline() failed.");
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            m_poGDS->m_nLoadedBlock = -1;
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            return CE_Failure;
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        }
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    }
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extract_band_data:
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    /* -------------------------------------------------------------------- */
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    /*      Extract band data from contig buffer.                           */
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    /* -------------------------------------------------------------------- */
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    if (m_poGDS->m_pabyBlockBuf != nullptr)
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    {
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        for (int iPixel = 0, iSrcOffset = nBand - 1, iDstOffset = 0;
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             iPixel < nBlockXSize;
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             ++iPixel, iSrcOffset += m_poGDS->nBands, ++iDstOffset)
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        {
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            static_cast<GByte *>(pImage)[iDstOffset] =
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                m_poGDS->m_pabyBlockBuf[iSrcOffset];
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        }
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    }
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    return CE_None;
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}
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/************************************************************************/
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/*                            IWriteBlock()                             */
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/************************************************************************/
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CPLErr GTiffSplitBand::IWriteBlock(int /* nBlockXOff */, int /* nBlockYOff */,
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                                   void * /* pImage */)
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{
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    ReportError(CE_Failure, CPLE_AppDefined, "Split bands are read-only.");
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    return CE_Failure;
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}