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;
}
//--------------------------------------------------------------------------
// Process a SOFn marker. This is useful for the image dimensions
//--------------------------------------------------------------------------
void ExifData::process_SOFn ( const uchar * Data, int marker )
{
int data_precision, num_components;
data_precision = Data[2];
ExifData::Height = Get16m ( Data+3 );
ExifData::Width = Get16m ( Data+5 );
num_components = Data[7];
if ( num_components == 3 )
ExifData::IsColor = 1;
else
ExifData::IsColor = 0;
ExifData::Process = marker;
}
void Cexif::process_SOFn (const unsigned char * Data, int marker)
{
int 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);
}
//--------------------------------------------------------------------------
// Process a SOFn marker. This is useful for the image dimensions
//--------------------------------------------------------------------------
static void process_SOFn (const uchar * Data, int marker)
{
int data_precision, num_components;
data_precision = Data[2];
ImageInfo.Height = Get16m(Data+3);
ImageInfo.Width = Get16m(Data+5);
num_components = Data[7];
if (num_components == 3){
ImageInfo.IsColor = 1;
}else{
ImageInfo.IsColor = 0;
}
ImageInfo.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);
}
}
bool CExifRead::ProcessJFIF(unsigned char* pStart, unsigned int length)
{
if ( memcmp(pStart, "JFIF", 5 ) == 0)
{
if ( length < 14)
{
return false;
}
if ( m_flags & EXIF_VERSION)
strncpy_s(m_pExifInfo->Version,5,(char*)(pStart + 5), 2);
if ( m_flags & EXIF_RESOLUTION_UNITS)
{
m_pExifInfo->ResolutionUnit = *(pStart + 7);
}
if ( m_flags & EXIF_XRESOLUTION)
{
m_pExifInfo->Xresolution = Get16m(pStart + 8);
}
if ( m_flags & EXIF_YRESOLUTION)
{
m_pExifInfo->Yresolution = Get16m(pStart + 10);
}
//ËõÂÔͼµÄ¿í¸ß
// m_pExifInfo->Width = *(pStart + 12);
// m_pExifInfo->Height = *(pStart + 13);
return true;
}
else
{
return false;
}
}
bool CExifRead::ProcessPhotoshop(unsigned char* pStart, unsigned int length, unsigned int offset)
{
int temp = strlen(Photoshop_Header);
if ( memcmp(pStart, Photoshop_Header, temp) == 0)
{
temp += 1;
while ( temp < length)
{
if ( memcmp(pStart + temp, Photoshop_8BIM, 4) == 0)
{
temp += 4;
int tag = Get16m(pStart + temp);
int type = Get16m(pStart + temp + 2);
int lengthTag = Get32m(pStart + temp + 4);
if ( lengthTag%2 == 1)
{
lengthTag ++;
}
temp += 8;
switch (tag)
{
case 0x040c:
if ( m_bGetThumbNail && m_pExifInfo->pThumbnailPointer == NULL)
{
/*//0 Motorola-order Long Appears to always equal 1
Officially, this denotes the 'format', and this value could also equal 0, but it is not clear what that should mean, nor have we ever seen this.
4 Motorola-order Long Thumbnail width
8 Motorola-order Long Thumbnail height
12 Motorola-order Long Scanline size ( = thumbnail width * 3, padded to nearest multiple of 4)
16 Motorola-order Long Total decompressed thumbnail memory size ( = scanline size * thumbnail height)
20 Motorola-order Long Size of the JFIF data ( = size of resource data - 28)
24 Motorola-order Word Appears to always equal 24
Officially, this denotes the number of bits per pixel
26 Motorola-order Word Appears to always equal 1
Officially, this denotes the number of planes
28 Variable number of bytes, as indicated by 'Size of JFIF data' field JFIF data
*/
m_pExifInfo->ThumbnailSize = lengthTag - 28;
unsigned char * dat = new unsigned char[m_pExifInfo->ThumbnailSize];
memcpy(dat, pStart + temp + 28, m_pExifInfo->ThumbnailSize);
m_pExifInfo->pThumbnailPointer = dat;
m_pExifInfo->ThumbnailOffset = offset + temp + 28;
}
break;
default :
break;
}
temp += lengthTag;
}
}
return true;
}
else
{
return false;
}
}
