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jpgdataset.cpp
4276 lines (3691 loc) · 144 KB
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jpgdataset.cpp
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/******************************************************************************
*
* Project: JPEG JFIF Driver
* Purpose: Implement GDAL JPEG Support based on IJG libjpeg.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 2000, Frank Warmerdam
* Copyright (c) 2007-2014, Even Rouault <even dot rouault at spatialys.com>
*
* Portions Copyright (c) Her majesty the Queen in right of Canada as
* represented by the Minister of National Defence, 2006.
*
* 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 "cpl_port.h"
#include "jpgdataset.h"
#include <cerrno>
#include <climits>
#include <cstddef>
#include <cstdio>
#include <cstdint>
#include <cstdlib>
#include <cstring>
#if HAVE_FCNTL_H
# include <fcntl.h>
#endif
#include <limits>
#include <setjmp.h>
#include <algorithm>
#include <string>
#include "cpl_conv.h"
#include "cpl_error.h"
#include "cpl_progress.h"
#include "cpl_string.h"
#include "cpl_time.h"
#include "cpl_vsi.h"
#include "gdal.h"
#include "gdal_frmts.h"
#include "gdal_pam.h"
#include "gdal_priv.h"
#include "gdalexif.h"
CPL_C_START
#ifdef LIBJPEG_12_PATH
# include LIBJPEG_12_PATH
#else
# include "jpeglib.h"
#endif
CPL_C_END
#include "memdataset.h"
#include "rawdataset.h"
#include "vsidataio.h"
#if defined(EXPECTED_JPEG_LIB_VERSION) && !defined(LIBJPEG_12_PATH)
#if EXPECTED_JPEG_LIB_VERSION != JPEG_LIB_VERSION
#error EXPECTED_JPEG_LIB_VERSION != JPEG_LIB_VERSION
#endif
#endif
constexpr int TIFF_VERSION = 42;
constexpr int TIFF_BIGENDIAN = 0x4d4d;
constexpr int TIFF_LITTLEENDIAN = 0x4949;
constexpr int JPEG_TIFF_IMAGEWIDTH = 0x100;
constexpr int JPEG_TIFF_IMAGEHEIGHT = 0x101;
constexpr int JPEG_TIFF_COMPRESSION = 0x103;
constexpr int JPEG_EXIF_JPEGIFOFSET = 0x201;
constexpr int JPEG_EXIF_JPEGIFBYTECOUNT = 0x202;
// Ok to use setjmp().
#ifdef _MSC_VER
# pragma warning(disable:4611)
#endif
// Do we want to do special processing suitable for when JSAMPLE is a
// 16bit value?
#if defined(JPEG_LIB_MK1)
# define JPEG_LIB_MK1_OR_12BIT 1
#elif BITS_IN_JSAMPLE == 12
# define JPEG_LIB_MK1_OR_12BIT 1
#endif
/************************************************************************/
/* SetMaxMemoryToUse() */
/************************************************************************/
static void SetMaxMemoryToUse(struct jpeg_decompress_struct* psDInfo)
{
// This is to address bug related in ticket #1795.
if( CPLGetConfigOption("JPEGMEM", nullptr) == nullptr )
{
// If the user doesn't provide a value for JPEGMEM, we want to be sure
// that at least 500 MB will be used before creating the temporary file.
const long nMinMemory = 500 * 1024 * 1024;
psDInfo->mem->max_memory_to_use =
std::max(psDInfo->mem->max_memory_to_use, nMinMemory);
}
}
#if !defined(JPGDataset)
/************************************************************************/
/* ReadEXIFMetadata() */
/************************************************************************/
void JPGDatasetCommon::ReadEXIFMetadata()
{
if (bHasReadEXIFMetadata)
return;
CPLAssert(papszMetadata == nullptr);
// Save current position to avoid disturbing JPEG stream decoding.
const vsi_l_offset nCurOffset = VSIFTellL(m_fpImage);
if(EXIFInit(m_fpImage))
{
EXIFExtractMetadata(papszMetadata,
m_fpImage, nTiffDirStart,
bSwabflag, nTIFFHEADER,
nExifOffset, nInterOffset, nGPSOffset);
if(nExifOffset > 0){
EXIFExtractMetadata(papszMetadata,
m_fpImage, nExifOffset,
bSwabflag, nTIFFHEADER,
nExifOffset, nInterOffset, nGPSOffset);
}
if(nInterOffset > 0) {
EXIFExtractMetadata(papszMetadata,
m_fpImage, nInterOffset,
bSwabflag, nTIFFHEADER,
nExifOffset, nInterOffset, nGPSOffset);
}
if(nGPSOffset > 0) {
EXIFExtractMetadata(papszMetadata,
m_fpImage, nGPSOffset,
bSwabflag, nTIFFHEADER,
nExifOffset, nInterOffset, nGPSOffset);
}
// Avoid setting the PAM dirty bit just for that.
const int nOldPamFlags = nPamFlags;
// Append metadata from PAM after EXIF metadata.
papszMetadata = CSLMerge(papszMetadata, GDALPamDataset::GetMetadata());
// Expose XMP in EXIF in xml:XMP metadata domain
if( GDALDataset::GetMetadata("xml:XMP") == nullptr )
{
const char* pszXMP = CSLFetchNameValue(papszMetadata, "EXIF_XmlPacket");
if( pszXMP )
{
CPLDebug("JPEG", "Read XMP metadata from EXIF tag");
const char * const apszMDList[2] = { pszXMP, nullptr };
SetMetadata(const_cast<char**>(apszMDList), "xml:XMP");
papszMetadata = CSLSetNameValue(papszMetadata, "EXIF_XmlPacket", nullptr);
}
}
SetMetadata(papszMetadata);
nPamFlags = nOldPamFlags;
}
VSIFSeekL(m_fpImage, nCurOffset, SEEK_SET);
bHasReadEXIFMetadata = true;
}
/************************************************************************/
/* ReadXMPMetadata() */
/************************************************************************/
// See §2.1.3 of
// http://wwwimages.adobe.com/www.adobe.com/content/dam/Adobe/en/devnet/xmp/pdfs/XMPSpecificationPart3.pdf
void JPGDatasetCommon::ReadXMPMetadata()
{
if (bHasReadXMPMetadata)
return;
// Save current position to avoid disturbing JPEG stream decoding.
const vsi_l_offset nCurOffset = VSIFTellL(m_fpImage);
// Search for APP1 chunk.
constexpr int APP1_BYTE = 0xe1;
constexpr int JFIF_MARKER_SIZE = 2 + 2; // ID + size
constexpr const char APP1_XMP_SIGNATURE[] = "http://ns.adobe.com/xap/1.0/";
constexpr int APP1_XMP_SIGNATURE_LEN = static_cast<int>(sizeof(APP1_XMP_SIGNATURE));
GByte abyChunkHeader[JFIF_MARKER_SIZE + APP1_XMP_SIGNATURE_LEN] = {};
int nChunkLoc = 2;
bool bFoundXMP = false;
while(true)
{
if( VSIFSeekL(m_fpImage, nChunkLoc, SEEK_SET) != 0 )
break;
if( VSIFReadL(abyChunkHeader, sizeof(abyChunkHeader), 1, m_fpImage) != 1 )
break;
nChunkLoc += 2 + abyChunkHeader[2] * 256 + abyChunkHeader[3];
// COM marker.
if( abyChunkHeader[0] == 0xFF && abyChunkHeader[1] == 0xFE )
continue;
if( abyChunkHeader[0] != 0xFF
|| (abyChunkHeader[1] & 0xf0) != 0xe0 )
break; // Not an APP chunk.
if( abyChunkHeader[1] == APP1_BYTE &&
memcmp(reinterpret_cast<char *>(abyChunkHeader) + JFIF_MARKER_SIZE,
APP1_XMP_SIGNATURE, APP1_XMP_SIGNATURE_LEN) == 0 )
{
bFoundXMP = true;
break; // APP1 - XMP.
}
}
if (bFoundXMP)
{
const int nXMPLength = abyChunkHeader[2] * 256 + abyChunkHeader[3] - 2 - APP1_XMP_SIGNATURE_LEN;
if (nXMPLength > 0)
{
char *pszXMP =
static_cast<char *>(VSIMalloc(nXMPLength + 1));
if (pszXMP)
{
if (VSIFReadL(pszXMP, nXMPLength, 1, m_fpImage) == 1)
{
pszXMP[nXMPLength] = '\0';
// Avoid setting the PAM dirty bit just for that.
const int nOldPamFlags = nPamFlags;
char *apszMDList[2] = { pszXMP, nullptr };
SetMetadata(apszMDList, "xml:XMP");
nPamFlags = nOldPamFlags;
}
VSIFree(pszXMP);
}
}
}
VSIFSeekL(m_fpImage, nCurOffset, SEEK_SET);
bHasReadXMPMetadata = true;
}
/************************************************************************/
/* ReadFLIRMetadata() */
/************************************************************************/
// See https://exiftool.org/TagNames/FLIR.html
void JPGDatasetCommon::ReadFLIRMetadata()
{
if (bHasReadFLIRMetadata)
return;
bHasReadFLIRMetadata = true;
// Save current position to avoid disturbing JPEG stream decoding.
const vsi_l_offset nCurOffset = VSIFTellL(m_fpImage);
int nChunkLoc = 2;
// size of APP1 segment marker + size of "FLIR\0"
GByte abyChunkHeader[4 + 5];
std::vector<GByte> abyFLIR;
while(true)
{
if( VSIFSeekL(m_fpImage, nChunkLoc, SEEK_SET) != 0 )
break;
if( VSIFReadL(abyChunkHeader, sizeof(abyChunkHeader), 1, m_fpImage) != 1 )
break;
int nMarkerLength = abyChunkHeader[2] * 256 + abyChunkHeader[3] - 2;
nChunkLoc += 4 + nMarkerLength;
if( abyChunkHeader[1] == 0xe1 &&
memcmp(abyChunkHeader + 4, "FLIR\0", 5) == 0 )
{
// Somewhat arbitrary limit
if( abyFLIR.size() > 10 * 1024 * 1024 )
{
CPLError(CE_Warning, CPLE_AppDefined,
"Too large FLIR data compared to hardcoded limit");
abyFLIR.clear();
break;
}
// 8 = sizeof("FLIR\0") + '\1' + chunk_idx + chunk_count
if( nMarkerLength < 8 )
{
abyFLIR.clear();
break;
}
size_t nOldSize = abyFLIR.size();
abyFLIR.resize(nOldSize + nMarkerLength - 8);
GByte abyIgnored[3]; // skip '\1' + chunk_idx + chunk_count
if( VSIFReadL(abyIgnored, 3, 1, m_fpImage) != 1 ||
VSIFReadL(&abyFLIR[nOldSize], nMarkerLength - 8, 1, m_fpImage) != 1 )
{
abyFLIR.clear();
break;
}
}
}
// Restore file pointer
VSIFSeekL(m_fpImage, nCurOffset, SEEK_SET);
constexpr size_t FLIR_HEADER_SIZE = 64;
if(abyFLIR.size() < FLIR_HEADER_SIZE )
return;
if( memcmp(&abyFLIR[0], "FFF\0", 4) != 0 )
return;
const auto ReadString = [&abyFLIR](size_t nOffset, size_t nLen)
{
std::string osStr( reinterpret_cast<const char*>(abyFLIR.data()) + nOffset, nLen );
osStr.resize( strlen(osStr.c_str() ) );
return osStr;
};
bool bLittleEndian = false;
const auto ReadUInt16 = [&abyFLIR, &bLittleEndian](size_t nOffset)
{
std::uint16_t nVal;
memcpy(&nVal, &abyFLIR[nOffset], sizeof(nVal));
if( bLittleEndian )
CPL_LSBPTR16(&nVal);
else
CPL_MSBPTR16(&nVal);
return nVal;
};
const auto ReadInt16 = [&abyFLIR, &bLittleEndian](size_t nOffset)
{
std::int16_t nVal;
memcpy(&nVal, &abyFLIR[nOffset], sizeof(nVal));
if( bLittleEndian )
CPL_LSBPTR16(&nVal);
else
CPL_MSBPTR16(&nVal);
return nVal;
};
const auto ReadUInt32 = [&abyFLIR, &bLittleEndian](size_t nOffset)
{
std::uint32_t nVal;
memcpy(&nVal, &abyFLIR[nOffset], sizeof(nVal));
if( bLittleEndian )
CPL_LSBPTR32(&nVal);
else
CPL_MSBPTR32(&nVal);
return nVal;
};
const auto ReadInt32 = [&abyFLIR, &bLittleEndian](size_t nOffset)
{
std::int32_t nVal;
memcpy(&nVal, &abyFLIR[nOffset], sizeof(nVal));
if( bLittleEndian )
CPL_LSBPTR32(&nVal);
else
CPL_MSBPTR32(&nVal);
return nVal;
};
const auto ReadFloat32 = [&abyFLIR, &bLittleEndian](size_t nOffset)
{
float fVal;
memcpy(&fVal, &abyFLIR[nOffset], sizeof(fVal));
if( bLittleEndian )
CPL_LSBPTR32(&fVal);
else
CPL_MSBPTR32(&fVal);
return fVal;
};
const auto ReadFloat64 = [&abyFLIR, &bLittleEndian](size_t nOffset)
{
double fVal;
memcpy(&fVal, &abyFLIR[nOffset], sizeof(fVal));
if( bLittleEndian )
CPL_LSBPTR64(&fVal);
else
CPL_MSBPTR64(&fVal);
return fVal;
};
// Avoid setting the PAM dirty bit just for that.
struct PamFlagKeeper
{
int& m_nPamFlagsRef;
int m_nOldPamFlags;
explicit PamFlagKeeper(int& nPamFlagsRef): m_nPamFlagsRef(nPamFlagsRef), m_nOldPamFlags(nPamFlagsRef) {}
~PamFlagKeeper() { m_nPamFlagsRef = m_nOldPamFlags; }
};
PamFlagKeeper oKeeper(nPamFlags);
const auto SetStringIfNotEmpty = [&](const char* pszItemName, int nOffset, int nLength)
{
const auto str = ReadString(nOffset, nLength);
if( !str.empty() )
SetMetadataItem(pszItemName, str.c_str(), "FLIR");
};
SetStringIfNotEmpty("CreatorSoftware", 4, 16);
// Check file format version (big endian most of the time)
const auto nFileFormatVersion = ReadUInt32(20);
if( !(nFileFormatVersion >= 100 && nFileFormatVersion < 200) )
{
bLittleEndian = true; // retry with little-endian
const auto nFileFormatVersionOtherEndianness = ReadUInt32(20);
if( !(nFileFormatVersionOtherEndianness >= 100 && nFileFormatVersionOtherEndianness < 200) )
{
CPLDebug("JPEG", "FLIR: Unknown file format version: %u", nFileFormatVersion);
return;
}
}
const auto nOffsetRecordDirectory = ReadUInt32(24);
const auto nEntryCountRecordDirectory = ReadUInt32(28);
CPLDebugOnly("JPEG", "FLIR: record offset %u, entry count %u",
nOffsetRecordDirectory, nEntryCountRecordDirectory);
constexpr size_t SIZE_RECORD_DIRECTORY = 32;
if( nOffsetRecordDirectory < FLIR_HEADER_SIZE ||
nOffsetRecordDirectory +
SIZE_RECORD_DIRECTORY * nEntryCountRecordDirectory > abyFLIR.size() )
{
CPLDebug("JPEG", "Invalid FLIR FFF directory");
return;
}
// Read the RawData record
const auto ReadRawData = [&](std::uint32_t nRecOffset, std::uint32_t nRecLength)
{
if( !(nRecLength >= 32 &&
nRecOffset + nRecLength <= abyFLIR.size()) )
return;
const int nByteOrder = ReadUInt16(nRecOffset);
if( nByteOrder == 512 )
bLittleEndian = !bLittleEndian;
else if( nByteOrder != 2 )
return;
const auto nImageWidth = ReadUInt16(nRecOffset + 2);
SetMetadataItem("RawThermalImageWidth",
CPLSPrintf("%d", nImageWidth), "FLIR");
const auto nImageHeight = ReadUInt16(nRecOffset + 4);
SetMetadataItem("RawThermalImageHeight",
CPLSPrintf("%d", nImageHeight), "FLIR");
m_bRawThermalLittleEndian = bLittleEndian;
m_nRawThermalImageWidth = nImageWidth;
m_nRawThermalImageHeight = nImageHeight;
m_abyRawThermalImage.clear();
m_abyRawThermalImage.insert(m_abyRawThermalImage.end(),
abyFLIR.begin() + nRecOffset + 32,
abyFLIR.begin() + nRecOffset + nRecLength);
if( !STARTS_WITH(GetDescription(), "JPEG:") )
{
m_nSubdatasetCount ++;
SetMetadataItem(CPLSPrintf("SUBDATASET_%d_NAME", m_nSubdatasetCount),
CPLSPrintf("JPEG:\"%s\":FLIR_RAW_THERMAL_IMAGE", GetDescription()),
"SUBDATASETS");
SetMetadataItem(CPLSPrintf("SUBDATASET_%d_DESC", m_nSubdatasetCount),
"FLIR raw thermal image",
"SUBDATASETS");
}
};
// Read the Camera Info record
const auto ReadCameraInfo = [&](std::uint32_t nRecOffset, std::uint32_t nRecLength)
{
if( !(nRecLength >= 1126 &&
nRecOffset + nRecLength <= abyFLIR.size()) )
return;
const int nByteOrder = ReadUInt16(nRecOffset);
if( nByteOrder == 512 )
bLittleEndian = !bLittleEndian;
else if( nByteOrder != 2 )
return;
const auto ReadFloat32FromKelvin = [=](std::uint32_t nOffset)
{
constexpr float ZERO_CELCIUS_IN_KELVIN = 273.15f;
return ReadFloat32(nOffset) - ZERO_CELCIUS_IN_KELVIN;
};
SetMetadataItem("Emissivity",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 32)), "FLIR");
SetMetadataItem("ObjectDistance",
CPLSPrintf("%f m", ReadFloat32(nRecOffset + 36)), "FLIR");
SetMetadataItem("ReflectedApparentTemperature",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 40)), "FLIR");
SetMetadataItem("AtmosphericTemperature",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 44)), "FLIR");
SetMetadataItem("IRWindowTemperature",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 48)), "FLIR");
SetMetadataItem("IRWindowTemperature",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 52)), "FLIR");
auto fRelativeHumidity = ReadFloat32(nRecOffset + 60);
if( fRelativeHumidity > 2 )
fRelativeHumidity /= 100.0f; // Sometimes expressed in percentage
SetMetadataItem("RelativeHumidity",
CPLSPrintf("%f %%", 100.0f * fRelativeHumidity));
SetMetadataItem("PlanckR1",
CPLSPrintf("%.8g", ReadFloat32(nRecOffset + 88)), "FLIR");
SetMetadataItem("PlanckB",
CPLSPrintf("%.8g", ReadFloat32(nRecOffset + 92)), "FLIR");
SetMetadataItem("PlanckF",
CPLSPrintf("%.8g", ReadFloat32(nRecOffset + 96)), "FLIR");
SetMetadataItem("AtmosphericTransAlpha1",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 112)), "FLIR");
SetMetadataItem("AtmosphericTransAlpha2",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 116)), "FLIR");
SetMetadataItem("AtmosphericTransBeta1",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 120)), "FLIR");
SetMetadataItem("AtmosphericTransBeta2",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 124)), "FLIR");
SetMetadataItem("AtmosphericTransX",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 128)), "FLIR");
SetMetadataItem("CameraTemperatureRangeMax",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 144)), "FLIR");
SetMetadataItem("CameraTemperatureRangeMin",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 148)), "FLIR");
SetMetadataItem("CameraTemperatureMaxClip",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 152)), "FLIR");
SetMetadataItem("CameraTemperatureMinClip",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 156)), "FLIR");
SetMetadataItem("CameraTemperatureMaxWarn",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 160)), "FLIR");
SetMetadataItem("CameraTemperatureMinWarn",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 164)), "FLIR");
SetMetadataItem("CameraTemperatureMaxSaturated",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 168)), "FLIR");
SetMetadataItem("CameraTemperatureMinSaturated",
CPLSPrintf("%f C", ReadFloat32FromKelvin(nRecOffset + 172)), "FLIR");
SetStringIfNotEmpty("CameraModel", nRecOffset + 212, 32);
SetStringIfNotEmpty("CameraPartNumber", nRecOffset + 244, 16);
SetStringIfNotEmpty("CameraSerialNumber", nRecOffset + 260, 16);
SetStringIfNotEmpty("CameraSoftware", nRecOffset + 276, 16);
SetStringIfNotEmpty("LensModel", nRecOffset + 368, 32);
SetStringIfNotEmpty("LensPartNumber", nRecOffset + 400, 16);
SetStringIfNotEmpty("LensSerialNumber", nRecOffset + 416, 16);
SetMetadataItem("FieldOfView",
CPLSPrintf("%f deg", ReadFloat32(nRecOffset + 436)), "FLIR");
SetStringIfNotEmpty("FilterModel", nRecOffset + 492, 16);
SetStringIfNotEmpty("FilterPartNumber", nRecOffset + 508, 32);
SetStringIfNotEmpty("FilterSerialNumber", nRecOffset + 540, 32);
SetMetadataItem("PlanckO",
CPLSPrintf("%d", ReadInt32(nRecOffset + 776)), "FLIR");
SetMetadataItem("PlanckR2",
CPLSPrintf("%.8g", ReadFloat32(nRecOffset + 780)), "FLIR");
SetMetadataItem("RawValueRangeMin",
CPLSPrintf("%d", ReadUInt16(nRecOffset + 784)), "FLIR");
SetMetadataItem("RawValueRangeMax",
CPLSPrintf("%d", ReadUInt16(nRecOffset + 786)), "FLIR");
SetMetadataItem("RawValueMedian",
CPLSPrintf("%d", ReadUInt16(nRecOffset + 824)), "FLIR");
SetMetadataItem("RawValueRange",
CPLSPrintf("%d", ReadUInt16(nRecOffset + 828)), "FLIR");
const auto nUnixTime = ReadUInt32(nRecOffset + 900);
const auto nSS = ReadUInt32(nRecOffset + 904) & 0xffff;
const auto nTZ = ReadInt16(nRecOffset + 908);
struct tm brokenDown;
CPLUnixTimeToYMDHMS(static_cast<GIntBig>(nUnixTime) - nTZ * 60, &brokenDown);
std::string osDateTime(CPLSPrintf("%04d-%02d-%02dT%02d:%02d:%02d.%03d",
brokenDown.tm_year + 1900,
brokenDown.tm_mon + 1,
brokenDown.tm_mday,
brokenDown.tm_hour,
brokenDown.tm_min,
brokenDown.tm_sec,
nSS));
if( nTZ <= 0 )
osDateTime += CPLSPrintf("+%02d:%02d", (-nTZ) / 60, (-nTZ) % 60);
else
osDateTime += CPLSPrintf("-%02d:%02d", nTZ / 60, nTZ % 60);
SetMetadataItem("DateTimeOriginal", osDateTime.c_str(), "FLIR");
SetMetadataItem("FocusStepCount",
CPLSPrintf("%d", ReadUInt16(nRecOffset + 912)), "FLIR");
SetMetadataItem("FocusDistance",
CPLSPrintf("%f m", ReadFloat32(nRecOffset + 1116)), "FLIR");
SetMetadataItem("FrameRate",
CPLSPrintf("%d", ReadUInt16(nRecOffset + 1124)), "FLIR");
};
// Read the Palette Info record
const auto ReadPaletteInfo = [&](std::uint32_t nRecOffset, std::uint32_t nRecLength)
{
if( !(nRecLength >= 112 &&
nRecOffset + nRecLength <= abyFLIR.size()) )
return;
const int nPaletteColors = abyFLIR[nRecOffset];
SetMetadataItem("PaletteColors",
CPLSPrintf("%d", nPaletteColors), "FLIR");
const auto SetColorItem = [this, &abyFLIR](const char* pszItem, std::uint32_t nOffset)
{
SetMetadataItem(pszItem,
CPLSPrintf("%d %d %d",
abyFLIR[nOffset],
abyFLIR[nOffset+1],
abyFLIR[nOffset+2]), "FLIR");
};
SetColorItem("AboveColor", nRecOffset + 6);
SetColorItem("BelowColor", nRecOffset + 9);
SetColorItem("OverflowColor", nRecOffset + 12);
SetColorItem("UnderflowColor", nRecOffset + 15);
SetColorItem("Isotherm1Color", nRecOffset + 18);
SetColorItem("Isotherm2Color", nRecOffset + 21);
SetMetadataItem("PaletteMethod", CPLSPrintf("%d", abyFLIR[nRecOffset + 26]), "FLIR");
SetMetadataItem("PaletteStretch", CPLSPrintf("%d", abyFLIR[nRecOffset + 27]), "FLIR");
SetStringIfNotEmpty("PaletteFileName", nRecOffset + 48, 32);
SetStringIfNotEmpty("PaletteName", nRecOffset + 80, 32);
if( nRecLength < static_cast<std::uint32_t>(112 + nPaletteColors * 3) )
return;
std::string osPalette;
for( int i = 0; i < nPaletteColors; i++ )
{
if( !osPalette.empty() )
osPalette += ", ";
osPalette += CPLSPrintf("(%d %d %d)",
abyFLIR[nRecOffset + 112 + 3 * i + 0],
abyFLIR[nRecOffset + 112 + 3 * i + 1],
abyFLIR[nRecOffset + 112 + 3 * i + 2]);
}
SetMetadataItem("Palette", osPalette.c_str(), "FLIR");
};
// Read the GPS Info record
const auto ReadGPSInfo = [&](std::uint32_t nRecOffset, std::uint32_t nRecLength)
{
if( !(nRecLength >= 104 &&
nRecOffset + nRecLength <= abyFLIR.size()) )
return;
auto nGPSValid = ReadUInt32(nRecOffset);
if( nGPSValid == 0x01000000 )
{
bLittleEndian = !bLittleEndian;
nGPSValid = 1;
}
if( nGPSValid != 1 )
return;
SetMetadataItem("GPSVersionID",
CPLSPrintf("%c%c%c%c",
abyFLIR[nRecOffset + 4],
abyFLIR[nRecOffset + 5],
abyFLIR[nRecOffset + 6],
abyFLIR[nRecOffset + 7]),
"FLIR");
SetStringIfNotEmpty("GPSLatitudeRef", nRecOffset + 8, 1);
SetStringIfNotEmpty("GPSLongitudeRef", nRecOffset + 10, 1);
SetMetadataItem("GPSLatitude",
CPLSPrintf("%.10f", ReadFloat64(nRecOffset + 16)), "FLIR");
SetMetadataItem("GPSLongitude",
CPLSPrintf("%.10f", ReadFloat64(nRecOffset + 24)), "FLIR");
SetMetadataItem("GPSAltitude",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 32)), "FLIR");
SetMetadataItem("GPSDOP",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 64)), "FLIR");
SetStringIfNotEmpty("GPSSpeedRef", nRecOffset + 68, 1);
SetStringIfNotEmpty("GPSTrackRef", nRecOffset + 70, 1);
SetMetadataItem("GPSSpeed",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 76)), "FLIR");
SetMetadataItem("GPSTrack",
CPLSPrintf("%f", ReadFloat32(nRecOffset + 80)), "FLIR");
SetStringIfNotEmpty("GPSMapDatum", nRecOffset + 88, 16);
};
size_t nOffsetDirEntry = nOffsetRecordDirectory;
enum FLIRRecordType
{
FLIR_REC_FREE = 0,
FLIR_REC_RAWDATA = 1,
FLIR_REC_CAMERA_INFO = 32,
FLIR_REC_PALETTE_INFO = 34,
FLIR_REC_GPS_INFO = 43,
};
// Iterate over records
for( std::uint32_t iRec = 0; iRec < nEntryCountRecordDirectory; iRec++ )
{
const auto nRecType = ReadUInt16(nOffsetDirEntry);
const auto nRecOffset = ReadUInt32(nOffsetDirEntry + 12);
const auto nRecLength = ReadUInt32(nOffsetDirEntry + 16);
if( nRecType == FLIR_REC_FREE && nRecLength == 0 )
continue; // silently keep empty records of type 0
CPLDebugOnly("JPEG", "FLIR: record %u, type %u, offset %u, length %u",
iRec, nRecType, nRecOffset, nRecLength);
if( nRecOffset + nRecLength > abyFLIR.size() )
{
CPLDebug("JPEG", "Invalid record %u, type %u, offset %u, length %u "
"w.r.t total FLIR segment size (%u)",
iRec, nRecType, nRecOffset, nRecLength,
static_cast<unsigned>(abyFLIR.size()));
continue;
}
switch( nRecType )
{
case FLIR_REC_RAWDATA:
{
const auto bLittleEndianBackup = bLittleEndian;
ReadRawData(nRecOffset, nRecLength);
bLittleEndian = bLittleEndianBackup;
break;
}
case FLIR_REC_CAMERA_INFO:
{
const auto bLittleEndianBackup = bLittleEndian;
ReadCameraInfo(nRecOffset, nRecLength);
bLittleEndian = bLittleEndianBackup;
break;
}
case FLIR_REC_PALETTE_INFO:
{
ReadPaletteInfo(nRecOffset, nRecLength);
break;
}
case FLIR_REC_GPS_INFO:
{
const auto bLittleEndianBackup = bLittleEndian;
ReadGPSInfo(nRecOffset, nRecLength);
bLittleEndian = bLittleEndianBackup;
break;
}
default:
{
CPLDebugOnly("JPEG", "FLIR record ignored");
break;
}
}
nOffsetDirEntry += SIZE_RECORD_DIRECTORY;
}
CPLDebug("JPEG", "FLIR metadata read");
}
/************************************************************************/
/* GetMetadataDomainList() */
/************************************************************************/
char **JPGDatasetCommon::GetMetadataDomainList()
{
ReadFLIRMetadata();
return BuildMetadataDomainList(GDALPamDataset::GetMetadataDomainList(),
TRUE,
"xml:XMP", "COLOR_PROFILE", "FLIR", nullptr);
}
/************************************************************************/
/* LoadForMetadataDomain() */
/************************************************************************/
void JPGDatasetCommon::LoadForMetadataDomain( const char *pszDomain )
{
if (m_fpImage == nullptr)
return;
if (eAccess == GA_ReadOnly && !bHasReadEXIFMetadata &&
(pszDomain == nullptr || EQUAL(pszDomain, "")))
ReadEXIFMetadata();
if (eAccess == GA_ReadOnly &&
pszDomain != nullptr && EQUAL(pszDomain, "xml:XMP"))
{
if( !bHasReadXMPMetadata )
{
ReadXMPMetadata();
}
if( !bHasReadEXIFMetadata &&
GDALPamDataset::GetMetadata("xml:XMP") == nullptr )
{
// XMP can sometimes be embedded in a EXIF TIFF tag
ReadEXIFMetadata();
}
}
if (eAccess == GA_ReadOnly && !bHasReadICCMetadata &&
pszDomain != nullptr && EQUAL(pszDomain, "COLOR_PROFILE"))
ReadICCProfile();
if (eAccess == GA_ReadOnly && !bHasReadFLIRMetadata &&
pszDomain != nullptr && EQUAL(pszDomain, "FLIR"))
ReadFLIRMetadata();
if( pszDomain != nullptr && EQUAL(pszDomain, "SUBDATASETS") )
ReadFLIRMetadata();
}
/************************************************************************/
/* GetMetadata() */
/************************************************************************/
char **JPGDatasetCommon::GetMetadata( const char *pszDomain )
{
LoadForMetadataDomain(pszDomain);
return GDALPamDataset::GetMetadata(pszDomain);
}
/************************************************************************/
/* GetMetadataItem() */
/************************************************************************/
const char *JPGDatasetCommon::GetMetadataItem( const char *pszName,
const char *pszDomain )
{
LoadForMetadataDomain(pszDomain);
return GDALPamDataset::GetMetadataItem(pszName, pszDomain);
}
/************************************************************************/
/* ReadICCProfile() */
/* */
/* Read ICC Profile from APP2 data */
/************************************************************************/
void JPGDatasetCommon::ReadICCProfile()
{
if (bHasReadICCMetadata)
return;
bHasReadICCMetadata = true;
const vsi_l_offset nCurOffset = VSIFTellL(m_fpImage);
int nChunkCount = -1;
int anChunkSize[256] = {};
char *apChunk[256] = {};
// Search for APP2 chunk.
GByte abyChunkHeader[18] = {};
int nChunkLoc = 2;
bool bOk = true;
while(true)
{
if( VSIFSeekL(m_fpImage, nChunkLoc, SEEK_SET) != 0 )
break;
if( VSIFReadL(abyChunkHeader, sizeof(abyChunkHeader), 1, m_fpImage) != 1 )
break;
if( abyChunkHeader[0] != 0xFF )
break; // Not a valid tag
if (abyChunkHeader[1] == 0xD9)
break; // End of image
if ((abyChunkHeader[1] >= 0xD0) && (abyChunkHeader[1] <= 0xD8))
{
// Restart tags have no length
nChunkLoc += 2;
continue;
}
const int nChunkLength = abyChunkHeader[2] * 256 + abyChunkHeader[3];
if( abyChunkHeader[1] == 0xe2 &&
memcmp(reinterpret_cast<char *>(abyChunkHeader) + 4,
"ICC_PROFILE\0", 12) == 0 )
{
// Get length and segment ID
// Header:
// APP2 tag: 2 bytes
// App Length: 2 bytes
// ICC_PROFILE\0 tag: 12 bytes
// Segment index: 1 bytes
// Total segments: 1 bytes
const int nICCChunkLength = nChunkLength - 16;
if( nICCChunkLength < 0 )
{
CPLError(CE_Failure, CPLE_FileIO,
"nICCChunkLength unreasonable: %d", nICCChunkLength);
bOk = false;
break;
}
const int nICCChunkID = abyChunkHeader[16];
const int nICCMaxChunkID = abyChunkHeader[17];
if (nChunkCount == -1)
nChunkCount = nICCMaxChunkID;
// Check that all max segment counts are the same.
if (nICCMaxChunkID != nChunkCount)
{
bOk = false;
break;
}
// Check that no segment ID is larger than the total segment count.
if( (nICCChunkID > nChunkCount) || (nICCChunkID == 0) ||
(nChunkCount == 0) )
{
bOk = false;
break;
}
// Check if ICC segment already loaded.
if (apChunk[nICCChunkID-1] != nullptr)
{
bOk = false;
break;
}
// Load it.
apChunk[nICCChunkID - 1] =
static_cast<char *>(VSIMalloc(nICCChunkLength));
if( apChunk[nICCChunkID - 1] == nullptr )
{
bOk = false;
break;
}
anChunkSize[nICCChunkID - 1] = nICCChunkLength;
if( VSIFReadL(apChunk[nICCChunkID - 1], nICCChunkLength, 1,
m_fpImage) != 1 )
{
bOk = false;
break;
}
}
nChunkLoc += 2 + nChunkLength;
}
int nTotalSize = 0;
// Get total size and verify that there are no missing segments.
if (bOk)
{
for(int i = 0; i < nChunkCount; i++)
{
if (apChunk[i] == nullptr)
{
// Missing segment - abort.
bOk = false;
break;
}
const int nSize = anChunkSize[i];
if( nSize < 0 ||
nTotalSize > std::numeric_limits<int>::max() - nSize )
{
CPLError(CE_Failure, CPLE_FileIO, "nTotalSize nonsensical");
bOk = false;
break;
}
nTotalSize += anChunkSize[i];
}
}
// TODO(schwehr): Can we know what the maximum reasonable size is?
if( nTotalSize > 2 << 28 )
{
CPLError(CE_Failure, CPLE_FileIO,
"nTotalSize unreasonable: %d", nTotalSize);
bOk = false;
}
// Merge all segments together and set metadata.
if (bOk && nChunkCount > 0)
{
char *pBuffer = static_cast<char *>(VSIMalloc(nTotalSize));
if( pBuffer == nullptr )
{
CPLError(CE_Failure, CPLE_OutOfMemory,
"ICCProfile too large. nTotalSize: %d", nTotalSize);
}
else
{
char *pBufferPtr = pBuffer;
for(int i = 0; i < nChunkCount; i++)
{
memcpy(pBufferPtr, apChunk[i], anChunkSize[i]);
pBufferPtr += anChunkSize[i];
}