35e409e926
Found via `codespell -q 3 -S *.ts,thirdparty, -L appy,ba,inbetween,inout,pevent,possibile,upto`
139 lines
3.5 KiB
C++
139 lines
3.5 KiB
C++
/*-------------------------------------------------------------
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tiio_jpg_exif.h
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Based on source code of a public domain software "Exif Jpeg header manipulation
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tool (jhead)" by Matthias Wandel.
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For now it is used only for obtaining resolution values.
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http://www.sentex.net/~mwandel/jhead/
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-------------------------------------------------------------*/
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#pragma once
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#ifndef TIIO_JPG_EXIF_H
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#define TIIO_JPG_EXIF_H
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#include <stdlib.h>
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// undefining ReadAllTags will load only resolution information
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#define ReadAllTags
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#undef ReadAllTags
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#define MAX_COMMENT_SIZE 16000
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#define MAX_DATE_COPIES 10
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#ifdef _WIN32
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#define PATH_MAX _MAX_PATH
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#define SLASH '\\'
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#else
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#ifndef PATH_MAX
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#define PATH_MAX 1024
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#endif
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#define SLASH '/'
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#endif
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class JpgExifReader {
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enum FORMATS {
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FMT_BYTE = 1,
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FMT_STRING,
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FMT_USHORT,
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FMT_ULONG,
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FMT_URATIONAL,
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FMT_SBYTE,
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FMT_UNDEFINED,
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FMT_SSHORT,
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FMT_SLONG,
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FMT_SRATIONAL,
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FMT_SINGLE,
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FMT_DOUBLE
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};
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int NUM_FORMATS = FMT_DOUBLE;
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struct ExifImageInfo {
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float xResolution = 0.0;
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float yResolution = 0.0;
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int ResolutionUnit;
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#ifdef ReadAllTags
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char FileName[PATH_MAX + 1];
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time_t FileDateTime;
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unsigned FileSize;
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char CameraMake[32];
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char CameraModel[40];
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char DateTime[20];
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unsigned Height, Width;
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int Orientation;
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int IsColor;
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int Process;
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int FlashUsed;
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float FocalLength;
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float ExposureTime;
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float ApertureFNumber;
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float Distance;
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float CCDWidth;
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float ExposureBias;
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float DigitalZoomRatio;
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int FocalLength35mmEquiv; // Exif 2.2 tag - usually not present.
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int Whitebalance;
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int MeteringMode;
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int ExposureProgram;
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int ExposureMode;
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int ISOequivalent;
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int LightSource;
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int DistanceRange;
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char Comments[MAX_COMMENT_SIZE];
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int CommentWidthchars; // If nonzero, widechar comment, indicates number of
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// chars.
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unsigned ThumbnailOffset; // Exif offset to thumbnail
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unsigned ThumbnailSize; // Size of thumbnail.
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unsigned LargestExifOffset; // Last exif data referenced (to check if
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// thumbnail is at end)
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char ThumbnailAtEnd; // Exif header ends with the thumbnail
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// (we can only modify the thumbnail if its at the end)
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int ThumbnailSizeOffset;
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int DateTimeOffsets[MAX_DATE_COPIES];
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int numDateTimeTags = 0;
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int GpsInfoPresent;
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char GpsLat[31];
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char GpsLong[31];
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char GpsAlt[20];
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int QualityGuess;
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#endif
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} ImageInfo;
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#ifdef ReadAllTags
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unsigned char* DirWithThumbnailPtrs;
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double FocalplaneXRes;
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double FocalplaneUnits;
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int ExifImageWidth;
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// for fixing the rotation.
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void* OrientationPtr[2];
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int OrientationNumFormat[2];
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int NumOrientations = 0;
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#endif
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int MotorolaOrder = 0;
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int Get16u(void* Short);
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unsigned Get32u(void* Long);
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int Get32s(void* Long);
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void PrintFormatNumber(void* ValuePtr, int Format, int ByteCount);
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double ConvertAnyFormat(void* ValuePtr, int Format);
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public:
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void process_EXIF(unsigned char* ExifSection, unsigned int length);
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void ProcessExifDir(unsigned char* DirStart, unsigned char* OffsetBase,
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unsigned ExifLength, int NestingLevel);
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// obtaining resolution info
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bool containsResolution() { return ImageInfo.xResolution != 0.0; }
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float getXResolution() { return ImageInfo.xResolution; }
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float getYResolution() { return ImageInfo.yResolution; }
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int getResolutionUnit() { return ImageInfo.ResolutionUnit; }
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};
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#endif |