/src/gdal/gcore/gdaldefaultasync.cpp

Source
/******************************************************************************
 *
 * Project:  GDAL Core
 * Purpose:  Implementation of GDALDefaultAsyncReader and the
 *           GDALAsyncReader base class.
 * Author:   Frank Warmerdam, warmerdam@pobox.com
 *
 ******************************************************************************
 * Copyright (c) 2010, Frank Warmerdam
 *
 * SPDX-License-Identifier: MIT
 ****************************************************************************/

#include "cpl_port.h"
#include "gdal_priv.h"

#include <cstring>

#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_string.h"
#include "gdal.h"

/************************************************************************/
/* ==================================================================== */
/*                         GDALAsyncReader                              */
/* ==================================================================== */
/************************************************************************/

/************************************************************************/
/*                          GDALAsyncReader()                           */
/************************************************************************/

GDALAsyncReader::GDALAsyncReader()
    : poDS(nullptr), nXOff(0), nYOff(0), nXSize(0), nYSize(0), pBuf(nullptr),
      nBufXSize(0), nBufYSize(0), eBufType(GDT_Unknown), nBandCount(0),
      panBandMap(nullptr), nPixelSpace(0), nLineSpace(0), nBandSpace(0)
{
}

/************************************************************************/
/*                          ~GDALAsyncReader()                          */
/************************************************************************/
GDALAsyncReader::~GDALAsyncReader() = default;

/************************************************************************/
/*                        GetNextUpdatedRegion()                        */
/************************************************************************/

/**
 * \fn GDALAsyncStatusType GDALAsyncReader::GetNextUpdatedRegion( double
 * dfTimeout, int* pnBufXOff, int* pnBufYOff, int* pnBufXSize, int* pnBufYSize)
 * = 0;
 *
 * \brief Get async IO update
 *
 * Provide an opportunity for an asynchronous IO request to update the
 * image buffer and return an indication of the area of the buffer that
 * has been updated.
 *
 * The dfTimeout parameter can be used to wait for additional data to
 * become available.  The timeout does not limit the amount
 * of time this method may spend actually processing available data.
 *
 * The following return status are possible.
 * - GARIO_PENDING: No imagery was altered in the buffer, but there is still
 * activity pending, and the application should continue to call
 * GetNextUpdatedRegion() as time permits.
 * - GARIO_UPDATE: Some of the imagery has been updated, but there is still
 * activity pending.
 * - GARIO_ERROR: Something has gone wrong. The asynchronous request should
 * be ended.
 * - GARIO_COMPLETE: An update has occurred and there is no more pending work
 * on this request. The request should be ended and the buffer used.
 *
 * @param dfTimeout the number of seconds to wait for additional updates.  Use
 * -1 to wait indefinitely, or zero to not wait at all if there is no data
 * available.
 * @param pnBufXOff location to return the X offset of the area of the
 * request buffer that has been updated.
 * @param pnBufYOff location to return the Y offset of the area of the
 * request buffer that has been updated.
 * @param pnBufXSize location to return the X size of the area of the
 * request buffer that has been updated.
 * @param pnBufYSize location to return the Y size of the area of the
 * request buffer that has been updated.
 *
 * @return GARIO_ status, details described above.
 */

/************************************************************************/
/*                     GDALARGetNextUpdatedRegion()                     */
/************************************************************************/

/**
 * \brief Get async IO update
 *
 * Provide an opportunity for an asynchronous IO request to update the
 * image buffer and return an indication of the area of the buffer that
 * has been updated.
 *
 * The dfTimeout parameter can be used to wait for additional data to
 * become available.  The timeout does not limit the amount
 * of time this method may spend actually processing available data.
 *
 * The following return status are possible.
 * - GARIO_PENDING: No imagery was altered in the buffer, but there is still
 * activity pending, and the application should continue to call
 * GetNextUpdatedRegion() as time permits.
 * - GARIO_UPDATE: Some of the imagery has been updated, but there is still
 * activity pending.
 * - GARIO_ERROR: Something has gone wrong. The asynchronous request should
 * be ended.
 * - GARIO_COMPLETE: An update has occurred and there is no more pending work
 * on this request. The request should be ended and the buffer used.
 *
 * This is the same as GDALAsyncReader::GetNextUpdatedRegion()
 *
 * @param hARIO handle to the async reader.
 * @param dfTimeout the number of seconds to wait for additional updates.  Use
 * -1 to wait indefinitely, or zero to not wait at all if there is no data
 * available.
 * @param pnBufXOff location to return the X offset of the area of the
 * request buffer that has been updated.
 * @param pnBufYOff location to return the Y offset of the area of the
 * request buffer that has been updated.
 * @param pnBufXSize location to return the X size of the area of the
 * request buffer that has been updated.
 * @param pnBufYSize location to return the Y size of the area of the
 * request buffer that has been updated.
 *
 * @return GARIO_ status, details described above.
 */

GDALAsyncStatusType CPL_STDCALL GDALARGetNextUpdatedRegion(
    GDALAsyncReaderH hARIO, double dfTimeout, int *pnBufXOff, int *pnBufYOff,
    int *pnBufXSize, int *pnBufYSize)
{
    VALIDATE_POINTER1(hARIO, "GDALARGetNextUpdatedRegion", GARIO_ERROR);
    return static_cast<GDALAsyncReader *>(hARIO)->GetNextUpdatedRegion(
        dfTimeout, pnBufXOff, pnBufYOff, pnBufXSize, pnBufYSize);
}

/************************************************************************/
/*                             LockBuffer()                             */
/************************************************************************/

/**
 * \fn GDALAsyncReader::LockBuffer(double)
 * \brief Lock image buffer.
 *
 * Locks the image buffer passed into GDALDataset::BeginAsyncReader().
 * This is useful to ensure the image buffer is not being modified while
 * it is being used by the application.  UnlockBuffer() should be used
 * to release this lock when it is no longer needed.
 *
 * @param dfTimeout the time in seconds to wait attempting to lock the buffer.
 * -1.0 to wait indefinitely and 0 to not wait at all if it can't be
 * acquired immediately.  Default is -1.0 (infinite wait).
 *
 * @return TRUE if successful, or FALSE on an error.
 */

/**/
/**/

int GDALAsyncReader::LockBuffer(double /* dfTimeout */)
{
    return TRUE;
}

/************************************************************************/
/*                          GDALARLockBuffer()                          */
/************************************************************************/

/**
 * \brief Lock image buffer.
 *
 * Locks the image buffer passed into GDALDataset::BeginAsyncReader().
 * This is useful to ensure the image buffer is not being modified while
 * it is being used by the application.  UnlockBuffer() should be used
 * to release this lock when it is no longer needed.
 *
 * This is the same as GDALAsyncReader::LockBuffer()
 *
 * @param hARIO handle to async reader.
 * @param dfTimeout the time in seconds to wait attempting to lock the buffer.
 * -1.0 to wait indefinitely and 0 to not wait at all if it can't be
 * acquired immediately.  Default is -1.0 (infinite wait).
 *
 * @return TRUE if successful, or FALSE on an error.
 */

int CPL_STDCALL GDALARLockBuffer(GDALAsyncReaderH hARIO, double dfTimeout)
{
    VALIDATE_POINTER1(hARIO, "GDALARLockBuffer", FALSE);
    return static_cast<GDALAsyncReader *>(hARIO)->LockBuffer(dfTimeout);
}

/************************************************************************/
/*                            UnlockBuffer()                            */
/************************************************************************/

/**
 * \brief Unlock image buffer.
 *
 * Releases a lock on the image buffer previously taken with LockBuffer().
 */

void GDALAsyncReader::UnlockBuffer()

{
}

/************************************************************************/
/*                         GDALARUnlockBuffer()                         */
/************************************************************************/

/**
 * \brief Unlock image buffer.
 *
 * Releases a lock on the image buffer previously taken with LockBuffer().
 *
 * This is the same as GDALAsyncReader::UnlockBuffer()
 *
 * @param hARIO handle to async reader.
 */

void CPL_STDCALL GDALARUnlockBuffer(GDALAsyncReaderH hARIO)
{
    VALIDATE_POINTER0(hARIO, "GDALARUnlockBuffer");
    static_cast<GDALAsyncReader *>(hARIO)->UnlockBuffer();
}

/************************************************************************/
/* ==================================================================== */
/*                     GDALDefaultAsyncReader                           */
/* ==================================================================== */
/************************************************************************/

class GDALDefaultAsyncReader : public GDALAsyncReader
{
  private:
    char **papszOptions = nullptr;

    CPL_DISALLOW_COPY_ASSIGN(GDALDefaultAsyncReader)

  public:
    GDALDefaultAsyncReader(GDALDataset *poDS, int nXOff, int nYOff, int nXSize,
                           int nYSize, void *pBuf, int nBufXSize, int nBufYSize,
                           GDALDataType eBufType, int nBandCount,
                           int *panBandMap, int nPixelSpace, int nLineSpace,
                           int nBandSpace, CSLConstList papszOptions);
    ~GDALDefaultAsyncReader() override;

    GDALAsyncStatusType GetNextUpdatedRegion(double dfTimeout, int *pnBufXOff,
                                             int *pnBufYOff, int *pnBufXSize,
                                             int *pnBufYSize) override;
};

/************************************************************************/
/*                     GDALGetDefaultAsyncReader()                      */
/************************************************************************/

GDALAsyncReader *
GDALGetDefaultAsyncReader(GDALDataset *poDS, int nXOff, int nYOff, int nXSize,
                          int nYSize, void *pBuf, int nBufXSize, int nBufYSize,
                          GDALDataType eBufType, int nBandCount,
                          int *panBandMap, int nPixelSpace, int nLineSpace,
                          int nBandSpace, CSLConstList papszOptions)

{
    return new GDALDefaultAsyncReader(poDS, nXOff, nYOff, nXSize, nYSize, pBuf,
                                      nBufXSize, nBufYSize, eBufType,
                                      nBandCount, panBandMap, nPixelSpace,
                                      nLineSpace, nBandSpace, papszOptions);
}

/************************************************************************/
/*                       GDALDefaultAsyncReader()                       */
/************************************************************************/

GDALDefaultAsyncReader::GDALDefaultAsyncReader(
    GDALDataset *poDSIn, int nXOffIn, int nYOffIn, int nXSizeIn, int nYSizeIn,
    void *pBufIn, int nBufXSizeIn, int nBufYSizeIn, GDALDataType eBufTypeIn,
    int nBandCountIn, int *panBandMapIn, int nPixelSpaceIn, int nLineSpaceIn,
    int nBandSpaceIn, CSLConstList papszOptionsIn)

{
    poDS = poDSIn;
    nXOff = nXOffIn;
    nYOff = nYOffIn;
    nXSize = nXSizeIn;
    nYSize = nYSizeIn;
    pBuf = pBufIn;
    nBufXSize = nBufXSizeIn;
    nBufYSize = nBufYSizeIn;
    eBufType = eBufTypeIn;
    nBandCount = nBandCountIn;
    panBandMap = static_cast<int *>(CPLMalloc(sizeof(int) * nBandCountIn));

    if (panBandMapIn != nullptr)
        memcpy(panBandMap, panBandMapIn, sizeof(int) * nBandCount);
    else
    {
        for (int i = 0; i < nBandCount; i++)
            panBandMap[i] = i + 1;
    }

    nPixelSpace = nPixelSpaceIn;
    nLineSpace = nLineSpaceIn;
    nBandSpace = nBandSpaceIn;

    papszOptions = CSLDuplicate(papszOptionsIn);
}

/************************************************************************/
/*                      ~GDALDefaultAsyncReader()                       */
/************************************************************************/

GDALDefaultAsyncReader::~GDALDefaultAsyncReader()

{
    CPLFree(panBandMap);
    CSLDestroy(papszOptions);
}

/************************************************************************/
/*                        GetNextUpdatedRegion()                        */
/************************************************************************/

GDALAsyncStatusType
GDALDefaultAsyncReader::GetNextUpdatedRegion(double /*dfTimeout*/,
                                             int *pnBufXOff, int *pnBufYOff,
                                             int *pnBufXSize, int *pnBufYSize)
{
    CPLErr eErr;

    eErr =
        poDS->RasterIO(GF_Read, nXOff, nYOff, nXSize, nYSize, pBuf, nBufXSize,
                       nBufYSize, eBufType, nBandCount, panBandMap, nPixelSpace,
                       nLineSpace, nBandSpace, nullptr);

    *pnBufXOff = 0;
    *pnBufYOff = 0;
    *pnBufXSize = nBufXSize;
    *pnBufYSize = nBufYSize;

    if (eErr == CE_None)
        return GARIO_COMPLETE;
    else
        return GARIO_ERROR;
}

Coverage Report

Created: 2026-02-14 06:52

Line	Count	Source
1		/******************************************************************************
2		*
3		* Project: GDAL Core
4		* Purpose: Implementation of GDALDefaultAsyncReader and the
5		* GDALAsyncReader base class.
6		* Author: Frank Warmerdam, warmerdam@pobox.com
7		*
8		******************************************************************************
9		* Copyright (c) 2010, Frank Warmerdam
10		*
11		* SPDX-License-Identifier: MIT
12		****************************************************************************/
13
14		#include "cpl_port.h"
15		#include "gdal_priv.h"
16
17		#include <cstring>
18
19		#include "cpl_conv.h"
20		#include "cpl_error.h"
21		#include "cpl_string.h"
22		#include "gdal.h"
23
24		/************************************************************************/
25		/* ==================================================================== */
26		/* GDALAsyncReader */
27		/* ==================================================================== */
28		/************************************************************************/
29
30		/************************************************************************/
31		/* GDALAsyncReader() */
32		/************************************************************************/
33
34		GDALAsyncReader::GDALAsyncReader()
35	0	: poDS(nullptr), nXOff(0), nYOff(0), nXSize(0), nYSize(0), pBuf(nullptr),
36	0	nBufXSize(0), nBufYSize(0), eBufType(GDT_Unknown), nBandCount(0),
37	0	panBandMap(nullptr), nPixelSpace(0), nLineSpace(0), nBandSpace(0)
38	0	{
39	0	}
40
41		/************************************************************************/
42		/* ~GDALAsyncReader() */
43		/************************************************************************/
44	0	GDALAsyncReader::~GDALAsyncReader() = default;
45
46		/************************************************************************/
47		/* GetNextUpdatedRegion() */
48		/************************************************************************/
49
50		/**
51		* \fn GDALAsyncStatusType GDALAsyncReader::GetNextUpdatedRegion( double
52		* dfTimeout, int* pnBufXOff, int* pnBufYOff, int* pnBufXSize, int* pnBufYSize)
53		* = 0;
54		*
55		* \brief Get async IO update
56		*
57		* Provide an opportunity for an asynchronous IO request to update the
58		* image buffer and return an indication of the area of the buffer that
59		* has been updated.
60		*
61		* The dfTimeout parameter can be used to wait for additional data to
62		* become available. The timeout does not limit the amount
63		* of time this method may spend actually processing available data.
64		*
65		* The following return status are possible.
66		* - GARIO_PENDING: No imagery was altered in the buffer, but there is still
67		* activity pending, and the application should continue to call
68		* GetNextUpdatedRegion() as time permits.
69		* - GARIO_UPDATE: Some of the imagery has been updated, but there is still
70		* activity pending.
71		* - GARIO_ERROR: Something has gone wrong. The asynchronous request should
72		* be ended.
73		* - GARIO_COMPLETE: An update has occurred and there is no more pending work
74		* on this request. The request should be ended and the buffer used.
75		*
76		* @param dfTimeout the number of seconds to wait for additional updates. Use
77		* -1 to wait indefinitely, or zero to not wait at all if there is no data
78		* available.
79		* @param pnBufXOff location to return the X offset of the area of the
80		* request buffer that has been updated.
81		* @param pnBufYOff location to return the Y offset of the area of the
82		* request buffer that has been updated.
83		* @param pnBufXSize location to return the X size of the area of the
84		* request buffer that has been updated.
85		* @param pnBufYSize location to return the Y size of the area of the
86		* request buffer that has been updated.
87		*
88		* @return GARIO_ status, details described above.
89		*/
90
91		/************************************************************************/
92		/* GDALARGetNextUpdatedRegion() */
93		/************************************************************************/
94
95		/**
96		* \brief Get async IO update
97		*
98		* Provide an opportunity for an asynchronous IO request to update the
99		* image buffer and return an indication of the area of the buffer that
100		* has been updated.
101		*
102		* The dfTimeout parameter can be used to wait for additional data to
103		* become available. The timeout does not limit the amount
104		* of time this method may spend actually processing available data.
105		*
106		* The following return status are possible.
107		* - GARIO_PENDING: No imagery was altered in the buffer, but there is still
108		* activity pending, and the application should continue to call
109		* GetNextUpdatedRegion() as time permits.
110		* - GARIO_UPDATE: Some of the imagery has been updated, but there is still
111		* activity pending.
112		* - GARIO_ERROR: Something has gone wrong. The asynchronous request should
113		* be ended.
114		* - GARIO_COMPLETE: An update has occurred and there is no more pending work
115		* on this request. The request should be ended and the buffer used.
116		*
117		* This is the same as GDALAsyncReader::GetNextUpdatedRegion()
118		*
119		* @param hARIO handle to the async reader.
120		* @param dfTimeout the number of seconds to wait for additional updates. Use
121		* -1 to wait indefinitely, or zero to not wait at all if there is no data
122		* available.
123		* @param pnBufXOff location to return the X offset of the area of the
124		* request buffer that has been updated.
125		* @param pnBufYOff location to return the Y offset of the area of the
126		* request buffer that has been updated.
127		* @param pnBufXSize location to return the X size of the area of the
128		* request buffer that has been updated.
129		* @param pnBufYSize location to return the Y size of the area of the
130		* request buffer that has been updated.
131		*
132		* @return GARIO_ status, details described above.
133		*/
134
135		GDALAsyncStatusType CPL_STDCALL GDALARGetNextUpdatedRegion(
136		GDALAsyncReaderH hARIO, double dfTimeout, int pnBufXOff, int pnBufYOff,
137		int pnBufXSize, int pnBufYSize)
138	0	{
139	0	VALIDATE_POINTER1(hARIO, "GDALARGetNextUpdatedRegion", GARIO_ERROR);
140	0	return static_cast<GDALAsyncReader *>(hARIO)->GetNextUpdatedRegion(
141	0	dfTimeout, pnBufXOff, pnBufYOff, pnBufXSize, pnBufYSize);
142	0	}
143
144		/************************************************************************/
145		/* LockBuffer() */
146		/************************************************************************/
147
148		/**
149		* \fn GDALAsyncReader::LockBuffer(double)
150		* \brief Lock image buffer.
151		*
152		* Locks the image buffer passed into GDALDataset::BeginAsyncReader().
153		* This is useful to ensure the image buffer is not being modified while
154		* it is being used by the application. UnlockBuffer() should be used
155		* to release this lock when it is no longer needed.
156		*
157		* @param dfTimeout the time in seconds to wait attempting to lock the buffer.
158		* -1.0 to wait indefinitely and 0 to not wait at all if it can't be
159		* acquired immediately. Default is -1.0 (infinite wait).
160		*
161		* @return TRUE if successful, or FALSE on an error.
162		*/
163
164		/**/
165		/**/
166
167		int GDALAsyncReader::LockBuffer(double /* dfTimeout */)
168	0	{
169	0	return TRUE;
170	0	}
171
172		/************************************************************************/
173		/* GDALARLockBuffer() */
174		/************************************************************************/
175
176		/**
177		* \brief Lock image buffer.
178		*
179		* Locks the image buffer passed into GDALDataset::BeginAsyncReader().
180		* This is useful to ensure the image buffer is not being modified while
181		* it is being used by the application. UnlockBuffer() should be used
182		* to release this lock when it is no longer needed.
183		*
184		* This is the same as GDALAsyncReader::LockBuffer()
185		*
186		* @param hARIO handle to async reader.
187		* @param dfTimeout the time in seconds to wait attempting to lock the buffer.
188		* -1.0 to wait indefinitely and 0 to not wait at all if it can't be
189		* acquired immediately. Default is -1.0 (infinite wait).
190		*
191		* @return TRUE if successful, or FALSE on an error.
192		*/
193
194		int CPL_STDCALL GDALARLockBuffer(GDALAsyncReaderH hARIO, double dfTimeout)
195	0	{
196	0	VALIDATE_POINTER1(hARIO, "GDALARLockBuffer", FALSE);
197	0	return static_cast<GDALAsyncReader *>(hARIO)->LockBuffer(dfTimeout);
198	0	}
199
200		/************************************************************************/
201		/* UnlockBuffer() */
202		/************************************************************************/
203
204		/**
205		* \brief Unlock image buffer.
206		*
207		* Releases a lock on the image buffer previously taken with LockBuffer().
208		*/
209
210		void GDALAsyncReader::UnlockBuffer()
211
212	0	{
213	0	}
214
215		/************************************************************************/
216		/* GDALARUnlockBuffer() */
217		/************************************************************************/
218
219		/**
220		* \brief Unlock image buffer.
221		*
222		* Releases a lock on the image buffer previously taken with LockBuffer().
223		*
224		* This is the same as GDALAsyncReader::UnlockBuffer()
225		*
226		* @param hARIO handle to async reader.
227		*/
228
229		void CPL_STDCALL GDALARUnlockBuffer(GDALAsyncReaderH hARIO)
230	0	{
231	0	VALIDATE_POINTER0(hARIO, "GDALARUnlockBuffer");
232	0	static_cast<GDALAsyncReader *>(hARIO)->UnlockBuffer();
233	0	}
234
235		/************************************************************************/
236		/* ==================================================================== */
237		/* GDALDefaultAsyncReader */
238		/* ==================================================================== */
239		/************************************************************************/
240
241		class GDALDefaultAsyncReader : public GDALAsyncReader
242		{
243		private:
244		char **papszOptions = nullptr;
245
246		CPL_DISALLOW_COPY_ASSIGN(GDALDefaultAsyncReader)
247
248		public:
249		GDALDefaultAsyncReader(GDALDataset *poDS, int nXOff, int nYOff, int nXSize,
250		int nYSize, void *pBuf, int nBufXSize, int nBufYSize,
251		GDALDataType eBufType, int nBandCount,
252		int *panBandMap, int nPixelSpace, int nLineSpace,
253		int nBandSpace, CSLConstList papszOptions);
254		~GDALDefaultAsyncReader() override;
255
256		GDALAsyncStatusType GetNextUpdatedRegion(double dfTimeout, int *pnBufXOff,
257		int pnBufYOff, int pnBufXSize,
258		int *pnBufYSize) override;
259		};
260
261		/************************************************************************/
262		/* GDALGetDefaultAsyncReader() */
263		/************************************************************************/
264
265		GDALAsyncReader *
266		GDALGetDefaultAsyncReader(GDALDataset *poDS, int nXOff, int nYOff, int nXSize,
267		int nYSize, void *pBuf, int nBufXSize, int nBufYSize,
268		GDALDataType eBufType, int nBandCount,
269		int *panBandMap, int nPixelSpace, int nLineSpace,
270		int nBandSpace, CSLConstList papszOptions)
271
272	0	{
273	0	return new GDALDefaultAsyncReader(poDS, nXOff, nYOff, nXSize, nYSize, pBuf,
274	0	nBufXSize, nBufYSize, eBufType,
275	0	nBandCount, panBandMap, nPixelSpace,
276	0	nLineSpace, nBandSpace, papszOptions);
277	0	}
278
279		/************************************************************************/
280		/* GDALDefaultAsyncReader() */
281		/************************************************************************/
282
283		GDALDefaultAsyncReader::GDALDefaultAsyncReader(
284		GDALDataset *poDSIn, int nXOffIn, int nYOffIn, int nXSizeIn, int nYSizeIn,
285		void *pBufIn, int nBufXSizeIn, int nBufYSizeIn, GDALDataType eBufTypeIn,
286		int nBandCountIn, int *panBandMapIn, int nPixelSpaceIn, int nLineSpaceIn,
287		int nBandSpaceIn, CSLConstList papszOptionsIn)
288
289	0	{
290	0	poDS = poDSIn;
291	0	nXOff = nXOffIn;
292	0	nYOff = nYOffIn;
293	0	nXSize = nXSizeIn;
294	0	nYSize = nYSizeIn;
295	0	pBuf = pBufIn;
296	0	nBufXSize = nBufXSizeIn;
297	0	nBufYSize = nBufYSizeIn;
298	0	eBufType = eBufTypeIn;
299	0	nBandCount = nBandCountIn;
300	0	panBandMap = static_cast<int >(CPLMalloc(sizeof(int) nBandCountIn));
301
302	0	if (panBandMapIn != nullptr)
303	0	memcpy(panBandMap, panBandMapIn, sizeof(int) * nBandCount);
304	0	else
305	0	{
306	0	for (int i = 0; i < nBandCount; i++)
307	0	panBandMap[i] = i + 1;
308	0	}
309
310	0	nPixelSpace = nPixelSpaceIn;
311	0	nLineSpace = nLineSpaceIn;
312	0	nBandSpace = nBandSpaceIn;
313
314	0	papszOptions = CSLDuplicate(papszOptionsIn);
315	0	}
316
317		/************************************************************************/
318		/* ~GDALDefaultAsyncReader() */
319		/************************************************************************/
320
321		GDALDefaultAsyncReader::~GDALDefaultAsyncReader()
322
323	0	{
324	0	CPLFree(panBandMap);
325	0	CSLDestroy(papszOptions);
326	0	}
327
328		/************************************************************************/
329		/* GetNextUpdatedRegion() */
330		/************************************************************************/
331
332		GDALAsyncStatusType
333		GDALDefaultAsyncReader::GetNextUpdatedRegion(double /dfTimeout/,
334		int pnBufXOff, int pnBufYOff,
335		int pnBufXSize, int pnBufYSize)
336	0	{
337	0	CPLErr eErr;
338
339	0	eErr =
340	0	poDS->RasterIO(GF_Read, nXOff, nYOff, nXSize, nYSize, pBuf, nBufXSize,
341	0	nBufYSize, eBufType, nBandCount, panBandMap, nPixelSpace,
342	0	nLineSpace, nBandSpace, nullptr);
343
344	0	*pnBufXOff = 0;
345	0	*pnBufYOff = 0;
346	0	*pnBufXSize = nBufXSize;
347	0	*pnBufYSize = nBufYSize;
348
349	0	if (eErr == CE_None)
350	0	return GARIO_COMPLETE;
351	0	else
352	0	return GARIO_ERROR;
353	0	}