/
picexif.cpp
633 lines (568 loc) · 17.1 KB
/
picexif.cpp
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#include "picexif.h"
#include <lib/base/cfile.h>
#include <lib/base/eerror.h>
#define M_SOF0 0xC0
#define M_SOF1 0xC1
#define M_SOF2 0xC2
#define M_SOF3 0xC3
#define M_SOF5 0xC5
#define M_SOF6 0xC6
#define M_SOF7 0xC7
#define M_SOF9 0xC9
#define M_SOF10 0xCA
#define M_SOF11 0xCB
#define M_SOF13 0xCD
#define M_SOF14 0xCE
#define M_SOF15 0xCF
#define M_SOI 0xD8
#define M_EOI 0xD9
#define M_SOS 0xDA
#define M_JFIF 0xE0
#define M_EXIF 0xE1
#define M_COM 0xFE
#define NUM_FORMATS 12
#define FMT_BYTE 1
#define FMT_STRING 2
#define FMT_USHORT 3
#define FMT_ULONG 4
#define FMT_URATIONAL 5
#define FMT_SBYTE 6
#define FMT_UNDEFINED 7
#define FMT_SSHORT 8
#define FMT_SLONG 9
#define FMT_SRATIONAL 10
#define FMT_SINGLE 11
#define FMT_DOUBLE 12
#define TAG_EXIF_VERSION 0x9000
#define TAG_EXIF_OFFSET 0x8769
#define TAG_INTEROP_OFFSET 0xa005
#define TAG_MAKE 0x010F
#define TAG_MODEL 0x0110
#define TAG_ORIENTATION 0x0112
#define TAG_XRESOLUTION 0x011A
#define TAG_YRESOLUTION 0x011B
#define TAG_RESOLUTIONUNIT 0x0128
#define TAG_EXPOSURETIME 0x829A
#define TAG_FNUMBER 0x829D
#define TAG_SHUTTERSPEED 0x9201
#define TAG_APERTURE 0x9202
#define TAG_BRIGHTNESS 0x9203
#define TAG_MAXAPERTURE 0x9205
#define TAG_FOCALLENGTH 0x920A
#define TAG_DATETIME_ORIGINAL 0x9003
#define TAG_USERCOMMENT 0x9286
#define TAG_SUBJECT_DISTANCE 0x9206
#define TAG_FLASH 0x9209
#define TAG_FOCALPLANEXRES 0xa20E
#define TAG_FOCALPLANEYRES 0xa20F
#define TAG_FOCALPLANEUNITS 0xa210
#define TAG_EXIF_IMAGEWIDTH 0xA002
#define TAG_EXIF_IMAGELENGTH 0xA003
#define TAG_EXPOSURE_BIAS 0x9204
#define TAG_WHITEBALANCE 0x9208
#define TAG_METERING_MODE 0x9207
#define TAG_EXPOSURE_PROGRAM 0x8822
#define TAG_ISO_EQUIVALENT 0x8827
#define TAG_COMPRESSION_LEVEL 0x9102
#define TAG_THUMBNAIL_OFFSET 0x0201
#define TAG_THUMBNAIL_LENGTH 0x0202
Cexif::Cexif()
{
}
Cexif::~Cexif()
{
}
void Cexif::ClearExif()
{
if(freeinfo)
{
for(int i=0;i<MAX_SECTIONS;i++)
if(Sections[i].Data) free(Sections[i].Data);
delete m_exifinfo;
freeinfo = false;
}
}
bool Cexif::DecodeExif(const char *filename, int Thumb)
{
CFile hFile(filename, "rb");
if (!hFile)
return false;
m_exifinfo = new EXIFINFO;
memset(m_exifinfo,0,sizeof(EXIFINFO));
freeinfo = true;
m_exifinfo->Thumnailstate = Thumb;
m_szLastError[0]='\0';
ExifImageWidth = MotorolaOrder = SectionsRead=0;
memset(&Sections, 0, MAX_SECTIONS * sizeof(Section_t));
int HaveCom = 0;
int a = fgetc(hFile);
strcpy(m_szLastError,"EXIF-Data not found");
if (a != 0xff || fgetc(hFile) != M_SOI) return false;
for(;;)
{
int marker = 0;
int ll,lh, got, itemlen;
unsigned char * Data;
if (SectionsRead >= MAX_SECTIONS)
{
strcpy(m_szLastError,"Too many sections in jpg file"); return false;
}
for (a=0;a<7;a++)
{
marker = fgetc(hFile);
if (marker != 0xff) break;
if (a >= 6)
{
strcpy(m_szLastError,"too many padding unsigned chars\n"); return false;
}
}
if (marker == 0xff)
{
strcpy(m_szLastError,"too many padding unsigned chars!"); return false;
}
Sections[SectionsRead].Type = marker;
lh = fgetc(hFile);
ll = fgetc(hFile);
itemlen = (lh << 8) | ll;
if (itemlen < 2)
{
strcpy(m_szLastError,"invalid marker"); return false;
}
Sections[SectionsRead].Size = itemlen;
Data = (unsigned char *)malloc(itemlen);
if (Data == NULL)
{
strcpy(m_szLastError,"Could not allocate memory"); return false;
}
Sections[SectionsRead].Data = Data;
Data[0] = (unsigned char)lh;
Data[1] = (unsigned char)ll;
got = fread(Data+2, 1, itemlen-2,hFile);
if (got != itemlen-2)
{
strcpy(m_szLastError,"Premature end of file?"); return false;
}
SectionsRead += 1;
switch(marker)
{
case M_SOS:
return true;
case M_EOI:
eDebug("[Cexif] No image in jpeg!\n");
return false;
case M_COM:
if (HaveCom)
{
free(Sections[--SectionsRead].Data);
Sections[SectionsRead].Data=0;
}
else
{
process_COM(Data, itemlen);
HaveCom = 1;
}
break;
case M_JFIF:
free(Sections[--SectionsRead].Data);
Sections[SectionsRead].Data=0;
break;
case M_EXIF:
if (memcmp(Data+2, "Exif", 4) == 0)
{
m_exifinfo->IsExif = process_EXIF((unsigned char *)Data+2, itemlen);
}
else
{
free(Sections[--SectionsRead].Data);
Sections[SectionsRead].Data=0;
}
break;
case M_SOF0:
case M_SOF1:
case M_SOF2:
case M_SOF3:
case M_SOF5:
case M_SOF6:
case M_SOF7:
case M_SOF9:
case M_SOF10:
case M_SOF11:
case M_SOF13:
case M_SOF14:
case M_SOF15:
process_SOFn(Data, marker);
break;
default:
break;
}
}
return true;
}
bool Cexif::process_EXIF(unsigned char * CharBuf, unsigned int length)
{
m_exifinfo->Comments[0] = '\0';
ExifImageWidth = 0;
static const unsigned char ExifHeader[] = "Exif\0\0";
if(memcmp(CharBuf+0, ExifHeader,6))
{
strcpy(m_szLastError,"Incorrect Exif header"); return false;
}
if (memcmp(CharBuf+6,"II",2) == 0) MotorolaOrder = 0;
else
{
if (memcmp(CharBuf+6,"MM",2) == 0) MotorolaOrder = 1;
else
{
strcpy(m_szLastError,"Invalid Exif alignment marker."); return false;
}
}
if (Get16u(CharBuf+8) != 0x2a)
{
strcpy(m_szLastError,"Invalid Exif start (1)"); return false;
}
int FirstOffset = Get32u(CharBuf+10);
if (FirstOffset < 8 || FirstOffset > 16)
{
strcpy(m_szLastError,"Suspicious offset of first IFD value"); return 0;
}
unsigned char * LastExifRefd = CharBuf;
if (!ProcessExifDir(CharBuf+14, CharBuf+6, length-6, m_exifinfo, &LastExifRefd)) return false;
if (m_exifinfo->FocalplaneXRes != 0)
m_exifinfo->CCDWidth = (float)(ExifImageWidth * m_exifinfo->FocalplaneUnits / m_exifinfo->FocalplaneXRes);
return true;
}
int Cexif::Get16m(void * Short)
{
return (((unsigned char *)Short)[0] << 8) | ((unsigned char *)Short)[1];
}
int Cexif::Get16u(void * Short)
{
if (MotorolaOrder)
{
return (((unsigned char *)Short)[0] << 8) | ((unsigned char *)Short)[1];
}
else
{
return (((unsigned char *)Short)[1] << 8) | ((unsigned char *)Short)[0];
}
}
long Cexif::Get32s(void * Long)
{
if (MotorolaOrder)
{
return ((( char *)Long)[0] << 24) | (((unsigned char *)Long)[1] << 16) | (((unsigned char *)Long)[2] << 8 ) | (((unsigned char *)Long)[3] << 0 );
}
else
{
return ((( char *)Long)[3] << 24) | (((unsigned char *)Long)[2] << 16) | (((unsigned char *)Long)[1] << 8 ) | (((unsigned char *)Long)[0] << 0 );
}
}
unsigned long Cexif::Get32u(void * Long)
{
return (unsigned long)Get32s(Long) & 0xffffffff;
}
bool Cexif::ProcessExifDir(unsigned char * DirStart, unsigned char * OffsetBase, unsigned ExifLength, EXIFINFO * const m_exifinfo, unsigned char ** const LastExifRefdP )
{
int de, a, NumDirEntries;
unsigned ThumbnailOffset = 0;
unsigned ThumbnailSize = 0;
NumDirEntries = Get16u(DirStart);
if ((DirStart+2+NumDirEntries*12) > (OffsetBase+ExifLength))
{
strcpy(m_szLastError,"Illegally sized directory"); return 0;
}
for (de=0;de<NumDirEntries;de++)
{
int Tag, Format, Components;
unsigned char * ValuePtr;
int BytesCount;
unsigned char * DirEntry;
DirEntry = DirStart+2+12*de;
Tag = Get16u(DirEntry);
Format = Get16u(DirEntry+2);
Components = Get32u(DirEntry+4);
if ((Format-1) >= NUM_FORMATS)
{
strcpy(m_szLastError,"Illegal format code in EXIF dir"); return 0;
}
BytesCount = Components * BytesPerFormat[Format];
if (BytesCount > 4)
{
unsigned OffsetVal;
OffsetVal = Get32u(DirEntry+8);
if (OffsetVal+BytesCount > ExifLength)
{
strcpy(m_szLastError,"Illegal pointer offset value in EXIF."); return 0;
}
ValuePtr = OffsetBase+OffsetVal;
}
else ValuePtr = DirEntry+8;
if (*LastExifRefdP < ValuePtr+BytesCount) *LastExifRefdP = ValuePtr+BytesCount;
switch(Tag)
{
case TAG_MAKE:
strncpy(m_exifinfo->CameraMake, (char*)ValuePtr, 31);
break;
case TAG_MODEL:
strncpy(m_exifinfo->CameraModel, (char*)ValuePtr, 39);
break;
case TAG_EXIF_VERSION:
strncpy(m_exifinfo->Version,(char*)ValuePtr, 4);
break;
case TAG_DATETIME_ORIGINAL:
strncpy(m_exifinfo->DateTime, (char*)ValuePtr, 19);
break;
case TAG_USERCOMMENT:
for (a=BytesCount;;)
{
a--;
if (((char*)ValuePtr)[a] == ' ') ((char*)ValuePtr)[a] = '\0';
else break;
if (a == 0) break;
}
if (memcmp(ValuePtr, "ASCII",5) == 0)
{
for (a=5;a<10;a++)
{
char c;
c = ((char*)ValuePtr)[a];
if (c != '\0' && c != ' ')
{
strncpy(m_exifinfo->Comments, (char*)ValuePtr+a, 199);
break;
}
}
}
else strncpy(m_exifinfo->Comments, (char*)ValuePtr, 199);
break;
case TAG_FNUMBER:
m_exifinfo->ApertureFNumber = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_APERTURE:
case TAG_MAXAPERTURE:
if (m_exifinfo->ApertureFNumber == 0)
{
//m_exifinfo->ApertureFNumber = (float)exp(ConvertAnyFormat(ValuePtr, Format)*log(2)*0.5);
}
break;
case TAG_BRIGHTNESS:
m_exifinfo->Brightness = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_FOCALLENGTH:
m_exifinfo->FocalLength = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_SUBJECT_DISTANCE:
m_exifinfo->Distance = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_EXPOSURETIME:
m_exifinfo->ExposureTime = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_SHUTTERSPEED:
if (m_exifinfo->ExposureTime == 0)
{
//m_exifinfo->ExposureTime = (float) (1/exp(ConvertAnyFormat(ValuePtr, Format)*log(2)));
}
break;
case TAG_FLASH:
if ((int)ConvertAnyFormat(ValuePtr, Format) & 7) strcpy(m_exifinfo->FlashUsed,"fire");
else strcpy(m_exifinfo->FlashUsed,"not fired");
break;
case TAG_ORIENTATION:
m_exifinfo->Orient = (int)ConvertAnyFormat(ValuePtr, Format);
switch((int)ConvertAnyFormat(ValuePtr, Format))
{
case 1: strcpy(m_exifinfo->Orientation,"Top-Left"); break;
case 2: strcpy(m_exifinfo->Orientation,"Top-Right"); break;
case 3: strcpy(m_exifinfo->Orientation,"Bottom-Right"); break;
case 4: strcpy(m_exifinfo->Orientation,"Bottom-Left"); break;
case 5: strcpy(m_exifinfo->Orientation,"Left-Top"); break;
case 6: strcpy(m_exifinfo->Orientation,"Right-Top"); break;
case 7: strcpy(m_exifinfo->Orientation,"Right-Bottom"); break;
case 8: strcpy(m_exifinfo->Orientation,"Left-Bottom"); break;
default: strcpy(m_exifinfo->Orientation,"Undefined"); break;
}
break;
case TAG_EXIF_IMAGELENGTH:
case TAG_EXIF_IMAGEWIDTH:
a = (int)ConvertAnyFormat(ValuePtr, Format);
if (ExifImageWidth < a) ExifImageWidth = a;
break;
case TAG_FOCALPLANEXRES:
m_exifinfo->FocalplaneXRes = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_FOCALPLANEYRES:
m_exifinfo->FocalplaneYRes = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_RESOLUTIONUNIT:
switch((int)ConvertAnyFormat(ValuePtr, Format))
{
case 2: strcpy(m_exifinfo->ResolutionUnit,"inches"); break;
case 3: strcpy(m_exifinfo->ResolutionUnit,"centimeters"); break;
default: strcpy(m_exifinfo->ResolutionUnit,"reserved");
}
break;
case TAG_FOCALPLANEUNITS:
switch((int)ConvertAnyFormat(ValuePtr, Format))
{
case 1: m_exifinfo->FocalplaneUnits = 1.0f; break;
case 2: m_exifinfo->FocalplaneUnits = 1.0f; break;
case 3: m_exifinfo->FocalplaneUnits = 0.3937007874f; break;
case 4: m_exifinfo->FocalplaneUnits = 0.03937007874f; break;
case 5: m_exifinfo->FocalplaneUnits = 0.00003937007874f;
}
break;
case TAG_EXPOSURE_BIAS:
m_exifinfo->ExposureBias = (float) ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_WHITEBALANCE:
switch((int)ConvertAnyFormat(ValuePtr, Format))
{
case 0: strcpy(m_exifinfo->LightSource,"unknown"); break;
case 1: strcpy(m_exifinfo->LightSource,"Daylight"); break;
case 2: strcpy(m_exifinfo->LightSource,"Fluorescent"); break;
case 3: strcpy(m_exifinfo->LightSource,"Tungsten"); break;
case 17: strcpy(m_exifinfo->LightSource,"Standard light A"); break;
case 18: strcpy(m_exifinfo->LightSource,"Standard light B"); break;
case 19: strcpy(m_exifinfo->LightSource,"Standard light C"); break;
case 20: strcpy(m_exifinfo->LightSource,"D55"); break;
case 21: strcpy(m_exifinfo->LightSource,"D65"); break;
case 22: strcpy(m_exifinfo->LightSource,"D75"); break;
default: strcpy(m_exifinfo->LightSource,"other"); break;
}
break;
case TAG_METERING_MODE:
switch((int)ConvertAnyFormat(ValuePtr, Format))
{
case 0: strcpy(m_exifinfo->MeteringMode,"unknown"); break;
case 1: strcpy(m_exifinfo->MeteringMode,"Average"); break;
case 2: strcpy(m_exifinfo->MeteringMode,"Center-Weighted-Average"); break;
case 3: strcpy(m_exifinfo->MeteringMode,"Spot"); break;
case 4: strcpy(m_exifinfo->MeteringMode,"MultiSpot"); break;
case 5: strcpy(m_exifinfo->MeteringMode,"Pattern"); break;
case 6: strcpy(m_exifinfo->MeteringMode,"Partial"); break;
default: strcpy(m_exifinfo->MeteringMode,"other"); break;
}
break;
case TAG_EXPOSURE_PROGRAM:
switch((int)ConvertAnyFormat(ValuePtr, Format))
{
case 0: strcpy(m_exifinfo->ExposureProgram,"not defined"); break;
case 1: strcpy(m_exifinfo->ExposureProgram,"Manual"); break;
case 2: strcpy(m_exifinfo->ExposureProgram,"Normal program"); break;
case 3: strcpy(m_exifinfo->ExposureProgram,"Aperture priority"); break;
case 4: strcpy(m_exifinfo->ExposureProgram,"Shutter priority"); break;
case 5: strcpy(m_exifinfo->ExposureProgram,"Creative program"); break;
case 6: strcpy(m_exifinfo->ExposureProgram,"Action program"); break;
case 7: strcpy(m_exifinfo->ExposureProgram,"Portrait mode"); break;
case 8: strcpy(m_exifinfo->ExposureProgram,"Landscape mode"); break;
default: strcpy(m_exifinfo->ExposureProgram,"reserved"); break;
}
break;
case TAG_ISO_EQUIVALENT:
m_exifinfo->ISOequivalent = (int)ConvertAnyFormat(ValuePtr, Format);
if ( m_exifinfo->ISOequivalent < 50 ) m_exifinfo->ISOequivalent *= 200;
break;
case TAG_COMPRESSION_LEVEL:
m_exifinfo->CompressionLevel = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_XRESOLUTION:
m_exifinfo->Xresolution = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_YRESOLUTION:
m_exifinfo->Yresolution = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_THUMBNAIL_OFFSET:
ThumbnailOffset = (unsigned)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_THUMBNAIL_LENGTH:
ThumbnailSize = (unsigned)ConvertAnyFormat(ValuePtr, Format);
break;
}
if (Tag == TAG_EXIF_OFFSET || Tag == TAG_INTEROP_OFFSET)
{
unsigned char * SubdirStart;
SubdirStart = OffsetBase + Get32u(ValuePtr);
if (SubdirStart < OffsetBase || SubdirStart > OffsetBase+ExifLength)
{
strcpy(m_szLastError,"Illegal subdirectory link"); return 0;
}
ProcessExifDir(SubdirStart, OffsetBase, ExifLength, m_exifinfo, LastExifRefdP);
continue;
}
}
unsigned char * SubdirStart;
unsigned Offset;
Offset = Get16u(DirStart+2+12*NumDirEntries);
if (Offset)
{
SubdirStart = OffsetBase + Offset;
if (SubdirStart < OffsetBase || SubdirStart > OffsetBase+ExifLength)
{
strcpy(m_szLastError,"Illegal subdirectory link"); return 0;
}
ProcessExifDir(SubdirStart, OffsetBase, ExifLength, m_exifinfo, LastExifRefdP);
}
if (ThumbnailSize && ThumbnailOffset && m_exifinfo->Thumnailstate)
{
if (ThumbnailSize + ThumbnailOffset <= ExifLength)
{
if(FILE *tf = fopen(THUMBNAILTMPFILE, "w"))
{
fwrite( OffsetBase + ThumbnailOffset, ThumbnailSize, 1, tf);
fclose(tf);
m_exifinfo->Thumnailstate = 2;
}
}
}
return 1;
}
double Cexif::ConvertAnyFormat(void * ValuePtr, int Format)
{
double Value = 0;
switch(Format)
{
case FMT_SBYTE: Value = *(signed char *)ValuePtr; break;
case FMT_BYTE: Value = *(unsigned char *)ValuePtr; break;
case FMT_USHORT: Value = Get16u(ValuePtr); break;
case FMT_ULONG: Value = Get32u(ValuePtr); break;
case FMT_URATIONAL:
case FMT_SRATIONAL:
{
int Num = Get32s(ValuePtr);
int Den = Get32s(4+(char *)ValuePtr);
if (Den == 0) Value = 0;
else Value = (double)Num/Den;
break;
}
case FMT_SSHORT: Value = (signed short)Get16u(ValuePtr); break;
case FMT_SLONG: Value = Get32s(ValuePtr); break;
case FMT_SINGLE: Value = (double)*(float *)ValuePtr; break;
case FMT_DOUBLE: Value = *(double *)ValuePtr; break;
}
return Value;
}
void Cexif::process_COM (const unsigned char * Data, int length)
{
int ch,a;
char Comment[MAX_COMMENT+1];
int nch=0;
if (length > MAX_COMMENT) length = MAX_COMMENT;
for (a=2;a<length;a++)
{
ch = Data[a];
if (ch == '\r' && Data[a+1] == '\n') continue;
if ((ch>=0x20) || ch == '\n' || ch == '\t') Comment[nch++] = (char)ch;
else Comment[nch++] = '?';
}
Comment[nch] = '\0';
strcpy(m_exifinfo->Comments,Comment);
}
void Cexif::process_SOFn (const unsigned char * Data, int marker)
{
m_exifinfo->Height = Get16m((void*)(Data+3));
m_exifinfo->Width = Get16m((void*)(Data+5));
unsigned char num_components = Data[7];
if (num_components == 3) strcpy(m_exifinfo->IsColor,"yes");
else strcpy(m_exifinfo->IsColor,"no");
m_exifinfo->Process = marker;
}