diff options
| author |  Chris Xiong <chirs241097@gmail.com>
| 2015-10-26 22:52:36 +0800 |
|---|---|---|
| committer | Chris Xiong <chirs241097@gmail.com>
| 2015-10-26 22:52:36 +0800 |
| commit | 3bd383baf6a17e734329e1fc677c7e86283db772 (patch) | |
| tree | 69a9148087577f797624ceb9c71323a2563d6bb4 /hge/CxImage/ximaexif.cpp | |
| parent | 543e4f570be9b279ba558ca61cc02cda251af384 (diff) | |
| download | bullet-lab-remix-3bd383baf6a17e734329e1fc677c7e86283db772.tar.xz | |
Added support for relative line numbers.
Added instructions for, brk and cont. (They are still untested...)
Parser code cleanup. Removed garbage output to stderr.
Reorganize the repository structure.
Updated BLR2 code move it into archive.
Added BLR1 files.
Diffstat (limited to 'hge/CxImage/ximaexif.cpp')
| -rw-r--r-- | hge/CxImage/ximaexif.cpp | 877 |
1 files changed, 0 insertions, 877 deletions
diff --git a/hge/CxImage/ximaexif.cpp b/hge/CxImage/ximaexif.cpp deleted file mode 100644 index f880d72..0000000 --- a/hge/CxImage/ximaexif.cpp +++ /dev/null @@ -1,877 +0,0 @@ -/*
- * File: ximaexif.cpp
- * Purpose: EXIF reader
- * 18/Aug/2002 Davide Pizzolato - www.xdp.it
- * CxImage version 7.0.0 31/Dec/2010
- * based on jhead-1.8 by Matthias Wandel <mwandel(at)rim(dot)net>
- */
-
-#include "ximajpg.h"
-
-#if CXIMAGEJPG_SUPPORT_EXIF
-
-////////////////////////////////////////////////////////////////////////////////
-CxImageJPG::CxExifInfo::CxExifInfo(EXIFINFO* info)
-{
- if (info) {
- m_exifinfo = info;
- freeinfo = false;
- } else {
- m_exifinfo = new EXIFINFO;
- memset(m_exifinfo,0,sizeof(EXIFINFO));
- freeinfo = true;
- }
-
- m_szLastError[0]='\0';
- ExifImageWidth = MotorolaOrder = 0;
- SectionsRead=0;
- memset(&Sections, 0, MAX_SECTIONS * sizeof(Section_t));
-}
-////////////////////////////////////////////////////////////////////////////////
-CxImageJPG::CxExifInfo::~CxExifInfo()
-{
- for(int32_t i=0;i<MAX_SECTIONS;i++) if(Sections[i].Data) free(Sections[i].Data);
- if (freeinfo) delete m_exifinfo;
-}
-////////////////////////////////////////////////////////////////////////////////
-bool CxImageJPG::CxExifInfo::DecodeExif(CxFile * hFile, int32_t nReadMode)
-{
- int32_t a;
- int32_t HaveCom = FALSE;
-
- a = hFile->GetC();
-
- if (a != 0xff || hFile->GetC() != M_SOI){
- return FALSE;
- }
-
- for(;;){
- int32_t itemlen;
- int32_t marker = 0;
- int32_t ll,lh, got;
- uint8_t * Data;
-
- if (SectionsRead >= MAX_SECTIONS){
- strcpy(m_szLastError,"Too many sections in jpg file");
- return false;
- }
-
- for (a=0;a<7;a++){
- marker = hFile->GetC();
- if (marker != 0xff) break;
-
- if (a >= 6){
- printf("too many padding bytes\n");
- return false;
- }
- }
-
- if (marker == 0xff){
- // 0xff is legal padding, but if we get that many, something's wrong.
- strcpy(m_szLastError,"too many padding bytes!");
- return false;
- }
-
- Sections[SectionsRead].Type = marker;
-
- // Read the length of the section.
- lh = hFile->GetC();
- ll = hFile->GetC();
-
- itemlen = (lh << 8) | ll;
-
- if (itemlen < 2){
- strcpy(m_szLastError,"invalid marker");
- return false;
- }
-
- Sections[SectionsRead].Size = itemlen;
-
- Data = (uint8_t *)malloc(itemlen);
- if (Data == NULL){
- strcpy(m_szLastError,"Could not allocate memory");
- return false;
- }
- Sections[SectionsRead].Data = Data;
-
- // Store first two pre-read bytes.
- Data[0] = (uint8_t)lh;
- Data[1] = (uint8_t)ll;
-
- got = hFile->Read(Data+2, 1, itemlen-2); // Read the whole section.
- if (got != itemlen-2){
- strcpy(m_szLastError,"Premature end of file?");
- return false;
- }
- SectionsRead += 1;
-
- switch(marker){
-
- case M_SOS: // stop before hitting compressed data
- // If reading entire image is requested, read the rest of the data.
- if (nReadMode & EXIF_READ_IMAGE){
- int32_t cp, ep, size;
- // Determine how much file is left.
- cp = hFile->Tell();
- hFile->Seek(0, SEEK_END);
- ep = hFile->Tell();
- hFile->Seek(cp, SEEK_SET);
-
- size = ep-cp;
- Data = (uint8_t *)malloc(size);
- if (Data == NULL){
- strcpy(m_szLastError,"could not allocate data for entire image");
- return false;
- }
-
- got = hFile->Read(Data, 1, size);
- if (got != size){
- strcpy(m_szLastError,"could not read the rest of the image");
- return false;
- }
-
- Sections[SectionsRead].Data = Data;
- Sections[SectionsRead].Size = size;
- Sections[SectionsRead].Type = PSEUDO_IMAGE_MARKER;
- SectionsRead ++;
- }
- return true;
-
- case M_EOI: // in case it's a tables-only JPEG stream
- printf("No image in jpeg!\n");
- return FALSE;
-
- case M_COM: // Comment section
- if (HaveCom || ((nReadMode & EXIF_READ_EXIF) == 0)){
- // Discard this section.
- free(Sections[--SectionsRead].Data);
- Sections[SectionsRead].Data=0;
- }else{
- process_COM(Data, itemlen);
- HaveCom = TRUE;
- }
- break;
-
- case M_JFIF:
- // Regular jpegs always have this tag, exif images have the exif
- // marker instead, althogh ACDsee will write images with both markers.
- // this program will re-create this marker on absence of exif marker.
- // hence no need to keep the copy from the file.
- free(Sections[--SectionsRead].Data);
- Sections[SectionsRead].Data=0;
- break;
-
- case M_EXIF:
- // Seen files from some 'U-lead' software with Vivitar scanner
- // that uses marker 31 for non exif stuff. Thus make sure
- // it says 'Exif' in the section before treating it as exif.
- if ((nReadMode & EXIF_READ_EXIF) && memcmp(Data+2, "Exif", 4) == 0){
- m_exifinfo->IsExif = process_EXIF((uint8_t *)Data+2, itemlen);
- }else{
- // Discard this section.
- 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:
- // Skip any other sections.
- //if (ShowTags) printf("Jpeg section marker 0x%02x size %d\n",marker, itemlen);
- break;
- }
- }
- return true;
-}
-////////////////////////////////////////////////////////////////////////////////
-/*--------------------------------------------------------------------------
- Process a EXIF marker
- Describes all the drivel that most digital cameras include...
---------------------------------------------------------------------------*/
-bool CxImageJPG::CxExifInfo::process_EXIF(uint8_t * CharBuf, uint32_t length)
-{
- m_exifinfo->FlashUsed = 0;
- /* If it's from a digicam, and it used flash, it says so. */
- m_exifinfo->Comments[0] = '\0'; /* Initial value - null string */
-
- ExifImageWidth = 0;
-
- { /* Check the EXIF header component */
- static const uint8_t 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;
- }
- }
-
- /* Check the next two values for correctness. */
- if (Get16u(CharBuf+8) != 0x2a){
- strcpy(m_szLastError,"Invalid Exif start (1)");
- return false;
- }
-
- int32_t FirstOffset = Get32u(CharBuf+10);
- /* <Richard Collins>
- if (FirstOffset < 8 || FirstOffset > 16){
- // I used to ensure this was set to 8 (website I used indicated its 8)
- // but PENTAX Optio 230 has it set differently, and uses it as offset. (Sept 11 2002)
- strcpy(m_szLastError,"Suspicious offset of first IFD value");
- return false;
- }*/
-
- uint8_t * LastExifRefd = CharBuf;
-
- /* First directory starts 16 bytes in. Offsets start at 8 bytes in. */
- if (!ProcessExifDir(CharBuf+14, CharBuf+6, length-6, m_exifinfo, &LastExifRefd))
- return false;
-
- /* <Richard Collins> give a chance for a second directory */
- if (FirstOffset > 8) {
- if (!ProcessExifDir(CharBuf+14+FirstOffset-8, CharBuf+6, length-6, m_exifinfo, &LastExifRefd))
- return false;
- }
-
- /* This is how far the interesting (non thumbnail) part of the exif went. */
- // int32_t ExifSettingsLength = LastExifRefd - CharBuf;
-
- /* Compute the CCD width, in milimeters. */
- if (m_exifinfo->FocalplaneXRes != 0){
- m_exifinfo->CCDWidth = (float)(ExifImageWidth * m_exifinfo->FocalplaneUnits / m_exifinfo->FocalplaneXRes);
- }
-
- return true;
-}
-//--------------------------------------------------------------------------
-// Get 16 bits motorola order (always) for jpeg header stuff.
-//--------------------------------------------------------------------------
-int32_t CxImageJPG::CxExifInfo::Get16m(void * Short)
-{
- return (((uint8_t *)Short)[0] << 8) | ((uint8_t *)Short)[1];
-}
-////////////////////////////////////////////////////////////////////////////////
-/*--------------------------------------------------------------------------
- Convert a 16 bit unsigned value from file's native byte order
---------------------------------------------------------------------------*/
-int32_t CxImageJPG::CxExifInfo::Get16u(void * Short)
-{
- if (MotorolaOrder){
- return (((uint8_t *)Short)[0] << 8) | ((uint8_t *)Short)[1];
- }else{
- return (((uint8_t *)Short)[1] << 8) | ((uint8_t *)Short)[0];
- }
-}
-////////////////////////////////////////////////////////////////////////////////
-/*--------------------------------------------------------------------------
- Convert a 32 bit signed value from file's native byte order
---------------------------------------------------------------------------*/
-int32_t CxImageJPG::CxExifInfo::Get32s(void * Long)
-{
- if (MotorolaOrder){
- return ((( char *)Long)[0] << 24) | (((uint8_t *)Long)[1] << 16)
- | (((uint8_t *)Long)[2] << 8 ) | (((uint8_t *)Long)[3] << 0 );
- }else{
- return ((( char *)Long)[3] << 24) | (((uint8_t *)Long)[2] << 16)
- | (((uint8_t *)Long)[1] << 8 ) | (((uint8_t *)Long)[0] << 0 );
- }
-}
-////////////////////////////////////////////////////////////////////////////////
-/*--------------------------------------------------------------------------
- Convert a 32 bit unsigned value from file's native byte order
---------------------------------------------------------------------------*/
-uint32_t CxImageJPG::CxExifInfo::Get32u(void * Long)
-{
- return (uint32_t)Get32s(Long) & 0xffffffff;
-}
-////////////////////////////////////////////////////////////////////////////////
-
-/* Describes format descriptor */
-static const int32_t BytesPerFormat[] = {0,1,1,2,4,8,1,1,2,4,8,4,8};
-#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
-
-/* Describes tag values */
-
-#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
-
-/* the following is added 05-jan-2001 vcs */
-#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
-
-
-/*--------------------------------------------------------------------------
- Process one of the nested EXIF directories.
---------------------------------------------------------------------------*/
-bool CxImageJPG::CxExifInfo::ProcessExifDir(uint8_t * DirStart, uint8_t * OffsetBase, unsigned ExifLength,
- EXIFINFO * const m_exifinfo, uint8_t ** const LastExifRefdP, int32_t NestingLevel)
-{
- int32_t de;
- int32_t a;
- int32_t NumDirEntries;
- unsigned ThumbnailOffset = 0;
- unsigned ThumbnailSize = 0;
-
- if (NestingLevel > 4){
- strcpy(m_szLastError,"Maximum directory nesting exceeded (corrupt exif header)");
- return false;
- }
-
- NumDirEntries = Get16u(DirStart);
-
- if ((DirStart+2+NumDirEntries*12) > (OffsetBase+ExifLength)){
- strcpy(m_szLastError,"Illegally sized directory");
- return false;
- }
-
- for (de=0;de<NumDirEntries;de++){
- int32_t Tag, Format, Components;
- uint8_t * ValuePtr;
- /* This actually can point to a variety of things; it must be
- cast to other types when used. But we use it as a byte-by-byte
- cursor, so we declare it as a pointer to a generic byte here.
- */
- int32_t ByteCount;
- uint8_t * DirEntry;
- DirEntry = DirStart+2+12*de;
-
- Tag = Get16u(DirEntry);
- Format = Get16u(DirEntry+2);
- Components = Get32u(DirEntry+4);
-
- if ((Format-1) >= NUM_FORMATS) {
- /* (-1) catches illegal zero case as unsigned underflows to positive large */
- strcpy(m_szLastError,"Illegal format code in EXIF dir");
- return false;
- }
-
- ByteCount = Components * BytesPerFormat[Format];
-
- if (ByteCount > 4){
- unsigned OffsetVal;
- OffsetVal = Get32u(DirEntry+8);
- /* If its bigger than 4 bytes, the dir entry contains an offset.*/
- if (OffsetVal+ByteCount > ExifLength){
- /* Bogus pointer offset and / or bytecount value */
- strcpy(m_szLastError,"Illegal pointer offset value in EXIF.");
- return false;
- }
- ValuePtr = OffsetBase+OffsetVal;
- }else{
- /* 4 bytes or less and value is in the dir entry itself */
- ValuePtr = DirEntry+8;
- }
-
- if (*LastExifRefdP < ValuePtr+ByteCount){
- /* Keep track of last byte in the exif header that was
- actually referenced. That way, we know where the
- discardable thumbnail data begins.
- */
- *LastExifRefdP = ValuePtr+ByteCount;
- }
-
- /* Extract useful components of tag */
- 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:
- // Olympus has this padded with trailing spaces. Remove these first.
- for (a=ByteCount;;){
- a--;
- if (((char*)ValuePtr)[a] == ' '){
- ((char*)ValuePtr)[a] = '\0';
- }else{
- break;
- }
- if (a == 0) break;
- }
-
- /* Copy the comment */
- 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:
- /* Simplest way of expressing aperture, so I trust it the most.
- (overwrite previously computd value if there is one)
- */
- m_exifinfo->ApertureFNumber = (float)ConvertAnyFormat(ValuePtr, Format);
- break;
-
- case TAG_APERTURE:
- case TAG_MAXAPERTURE:
- /* More relevant info always comes earlier, so only
- use this field if we don't have appropriate aperture
- information yet.
- */
- if (m_exifinfo->ApertureFNumber == 0){
- m_exifinfo->ApertureFNumber = (float)exp(ConvertAnyFormat(ValuePtr, Format)*log(2.0f)*0.5);
- }
- break;
-
- case TAG_BRIGHTNESS:
- m_exifinfo->Brightness = (float)ConvertAnyFormat(ValuePtr, Format);
- break;
-
- case TAG_FOCALLENGTH:
- /* Nice digital cameras actually save the focal length
- as a function of how farthey are zoomed in.
- */
-
- m_exifinfo->FocalLength = (float)ConvertAnyFormat(ValuePtr, Format);
- break;
-
- case TAG_SUBJECT_DISTANCE:
- /* Inidcates the distacne the autofocus camera is focused to.
- Tends to be less accurate as distance increases.
- */
- m_exifinfo->Distance = (float)ConvertAnyFormat(ValuePtr, Format);
- break;
-
- case TAG_EXPOSURETIME:
- /* Simplest way of expressing exposure time, so I
- trust it most. (overwrite previously computd value
- if there is one)
- */
- m_exifinfo->ExposureTime =
- (float)ConvertAnyFormat(ValuePtr, Format);
- break;
-
- case TAG_SHUTTERSPEED:
- /* More complicated way of expressing exposure time,
- so only use this value if we don't already have it
- from somewhere else.
- */
- if (m_exifinfo->ExposureTime == 0){
- m_exifinfo->ExposureTime = (float)
- (1/exp(ConvertAnyFormat(ValuePtr, Format)*log(2.0f)));
- }
- break;
-
- case TAG_FLASH:
- if ((int32_t)ConvertAnyFormat(ValuePtr, Format) & 7){
- m_exifinfo->FlashUsed = 1;
- }else{
- m_exifinfo->FlashUsed = 0;
- }
- break;
-
- case TAG_ORIENTATION:
- m_exifinfo->Orientation = (int32_t)ConvertAnyFormat(ValuePtr, Format);
- if (m_exifinfo->Orientation < 1 || m_exifinfo->Orientation > 8){
- strcpy(m_szLastError,"Undefined rotation value");
- m_exifinfo->Orientation = 0;
- }
- break;
-
- case TAG_EXIF_IMAGELENGTH:
- case TAG_EXIF_IMAGEWIDTH:
- /* Use largest of height and width to deal with images
- that have been rotated to portrait format.
- */
- a = (int32_t)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((int32_t)ConvertAnyFormat(ValuePtr, Format)){
- case 1: m_exifinfo->ResolutionUnit = 1.0f; break; /* 1 inch */
- case 2: m_exifinfo->ResolutionUnit = 1.0f; break;
- case 3: m_exifinfo->ResolutionUnit = 0.3937007874f; break; /* 1 centimeter*/
- case 4: m_exifinfo->ResolutionUnit = 0.03937007874f; break; /* 1 millimeter*/
- case 5: m_exifinfo->ResolutionUnit = 0.00003937007874f; /* 1 micrometer*/
- }
- break;
-
- case TAG_FOCALPLANEUNITS:
- switch((int32_t)ConvertAnyFormat(ValuePtr, Format)){
- case 1: m_exifinfo->FocalplaneUnits = 1.0f; break; /* 1 inch */
- case 2: m_exifinfo->FocalplaneUnits = 1.0f; break;
- case 3: m_exifinfo->FocalplaneUnits = 0.3937007874f; break; /* 1 centimeter*/
- case 4: m_exifinfo->FocalplaneUnits = 0.03937007874f; break; /* 1 millimeter*/
- case 5: m_exifinfo->FocalplaneUnits = 0.00003937007874f; /* 1 micrometer*/
- }
- break;
-
- // Remaining cases contributed by: Volker C. Schoech <schoech(at)gmx(dot)de>
-
- case TAG_EXPOSURE_BIAS:
- m_exifinfo->ExposureBias = (float) ConvertAnyFormat(ValuePtr, Format);
- break;
-
- case TAG_WHITEBALANCE:
- m_exifinfo->Whitebalance = (int32_t)ConvertAnyFormat(ValuePtr, Format);
- break;
-
- case TAG_METERING_MODE:
- m_exifinfo->MeteringMode = (int32_t)ConvertAnyFormat(ValuePtr, Format);
- break;
-
- case TAG_EXPOSURE_PROGRAM:
- m_exifinfo->ExposureProgram = (int32_t)ConvertAnyFormat(ValuePtr, Format);
- break;
-
- case TAG_ISO_EQUIVALENT:
- m_exifinfo->ISOequivalent = (int32_t)ConvertAnyFormat(ValuePtr, Format);
- if ( m_exifinfo->ISOequivalent < 50 ) m_exifinfo->ISOequivalent *= 200;
- break;
-
- case TAG_COMPRESSION_LEVEL:
- m_exifinfo->CompressionLevel = (int32_t)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){
- uint8_t * SubdirStart;
- unsigned Offset = Get32u(ValuePtr);
- if (Offset>8){
- SubdirStart = OffsetBase + Offset;
- if (SubdirStart < OffsetBase ||
- SubdirStart > OffsetBase+ExifLength){
- strcpy(m_szLastError,"Illegal subdirectory link");
- return false;
- }
- ProcessExifDir(SubdirStart, OffsetBase, ExifLength, m_exifinfo, LastExifRefdP, NestingLevel+1);
- }
- continue;
- }
- }
-
-
- {
- /* In addition to linking to subdirectories via exif tags,
- there's also a potential link to another directory at the end
- of each directory. This has got to be the result of a
- committee!
- */
- uint8_t * 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 false;
- }
- ProcessExifDir(SubdirStart, OffsetBase, ExifLength, m_exifinfo, LastExifRefdP, NestingLevel+1);
- }
- }
-
-
- if (ThumbnailSize && ThumbnailOffset){
- if (ThumbnailSize + ThumbnailOffset <= ExifLength){
- /* The thumbnail pointer appears to be valid. Store it. */
- m_exifinfo->ThumbnailPointer = OffsetBase + ThumbnailOffset;
- m_exifinfo->ThumbnailSize = ThumbnailSize;
- }
- }
-
- return true;
-}
-////////////////////////////////////////////////////////////////////////////////
-/*--------------------------------------------------------------------------
- Evaluate number, be it int32_t, rational, or float from directory.
---------------------------------------------------------------------------*/
-double CxImageJPG::CxExifInfo::ConvertAnyFormat(void * ValuePtr, int32_t Format)
-{
- double Value;
- Value = 0;
-
- switch(Format){
- case FMT_SBYTE: Value = *(signed char *)ValuePtr; break;
- case FMT_BYTE: Value = *(uint8_t *)ValuePtr; break;
-
- case FMT_USHORT: Value = Get16u(ValuePtr); break;
- case FMT_ULONG: Value = Get32u(ValuePtr); break;
-
- case FMT_URATIONAL:
- case FMT_SRATIONAL:
- {
- int32_t Num,Den;
- Num = Get32s(ValuePtr);
- Den = Get32s(4+(char *)ValuePtr);
- if (Den == 0){
- Value = 0;
- }else{
- Value = (double)Num/Den;
- }
- break;
- }
-
- case FMT_SSHORT: Value = (int16_t)Get16u(ValuePtr); break;
- case FMT_SLONG: Value = Get32s(ValuePtr); break;
-
- /* Not sure if this is correct (never seen float used in Exif format)
- */
- case FMT_SINGLE: Value = (double)*(float *)ValuePtr; break;
- case FMT_DOUBLE: Value = *(double *)ValuePtr; break;
- }
- return Value;
-}
-////////////////////////////////////////////////////////////////////////////////
-void CxImageJPG::CxExifInfo::process_COM (const uint8_t * Data, int32_t length)
-{
- int32_t ch;
- char Comment[MAX_COMMENT+1];
- int32_t nch;
- int32_t a;
-
- nch = 0;
-
- if (length > MAX_COMMENT) length = MAX_COMMENT; // Truncate if it won't fit in our structure.
-
- for (a=2;a<length;a++){
- ch = Data[a];
-
- if (ch == '\r' && Data[a+1] == '\n') continue; // Remove cr followed by lf.
-
- if (isprint(ch) || ch == '\n' || ch == '\t'){
- Comment[nch++] = (char)ch;
- }else{
- Comment[nch++] = '?';
- }
- }
-
- Comment[nch] = '\0'; // Null terminate
-
- //if (ShowTags) printf("COM marker comment: %s\n",Comment);
-
- strcpy(m_exifinfo->Comments,Comment);
-}
-////////////////////////////////////////////////////////////////////////////////
-void CxImageJPG::CxExifInfo::process_SOFn (const uint8_t * Data, int32_t marker)
-{
- int32_t data_precision, num_components;
-
- data_precision = Data[2];
- m_exifinfo->Height = Get16m((void*)(Data+3));
- m_exifinfo->Width = Get16m((void*)(Data+5));
- num_components = Data[7];
-
- if (num_components == 3){
- m_exifinfo->IsColor = 1;
- }else{
- m_exifinfo->IsColor = 0;
- }
-
- m_exifinfo->Process = marker;
-
- //if (ShowTags) printf("JPEG image is %uw * %uh, %d color components, %d bits per sample\n",
- // ImageInfo.Width, ImageInfo.Height, num_components, data_precision);
-}
-////////////////////////////////////////////////////////////////////////////////
-/**
- * this will work only on a CxImageJPG object, if the image originally has valid EXIF data
- \verbatim
- CxImageJPG jpg;
- CxIOFile in,out;
- in.Open("D:\\exif_in.jpg","rb");
- out.Open("D:\\exif_out.jpg","w+b");
- jpg.Decode(&in);
- if (jpg.IsValid()){
- jpg.RotateLeft();
- jpg.Encode(&out);
- }
- \endverbatim
-*/
-bool CxImageJPG::CxExifInfo::EncodeExif(CxFile * hFile)
-{
- int32_t a;
-
- if (FindSection(M_SOS)==NULL){
- strcpy(m_szLastError,"Can't write exif : didn't read all");
- return false;
- }
-
- // Initial static jpeg marker.
- hFile->PutC(0xff);
- hFile->PutC(0xd8);
-
- if (Sections[0].Type != M_EXIF && Sections[0].Type != M_JFIF){
- // The image must start with an exif or jfif marker. If we threw those away, create one.
- static uint8_t JfifHead[18] = {
- 0xff, M_JFIF,
- 0x00, 0x10, 'J' , 'F' , 'I' , 'F' , 0x00, 0x01,
- 0x01, 0x01, 0x01, 0x2C, 0x01, 0x2C, 0x00, 0x00
- };
- hFile->Write(JfifHead, 18, 1);
- }
-
- // Write all the misc sections
- for (a=0;a<SectionsRead-1;a++){
- hFile->PutC(0xff);
- hFile->PutC((uint8_t)(Sections[a].Type));
- hFile->Write(Sections[a].Data, Sections[a].Size, 1);
- }
-
- // Write the remaining image data.
- hFile->Write(Sections[a].Data, Sections[a].Size, 1);
-
- return true;
-}
-////////////////////////////////////////////////////////////////////////////////
-void CxImageJPG::CxExifInfo::DiscardAllButExif()
-{
- Section_t ExifKeeper;
- Section_t CommentKeeper;
- int32_t a;
-
- memset(&ExifKeeper, 0, sizeof(ExifKeeper));
- memset(&CommentKeeper, 0, sizeof(ExifKeeper));
-
- for (a=0;a<SectionsRead;a++){
- if (Sections[a].Type == M_EXIF && ExifKeeper.Type == 0){
- ExifKeeper = Sections[a];
- }else if (Sections[a].Type == M_COM && CommentKeeper.Type == 0){
- CommentKeeper = Sections[a];
- }else{
- free(Sections[a].Data);
- Sections[a].Data = 0;
- }
- }
- SectionsRead = 0;
- if (ExifKeeper.Type){
- Sections[SectionsRead++] = ExifKeeper;
- }
- if (CommentKeeper.Type){
- Sections[SectionsRead++] = CommentKeeper;
- }
-}
-////////////////////////////////////////////////////////////////////////////////
-void* CxImageJPG::CxExifInfo::FindSection(int32_t SectionType)
-{
- int32_t a;
- for (a=0;a<SectionsRead-1;a++){
- if (Sections[a].Type == SectionType){
- return &Sections[a];
- }
- }
- // Could not be found.
- return NULL;
-}
-////////////////////////////////////////////////////////////////////////////////
-#endif // CXIMAGEJPG_SUPPORT_EXIF
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