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CODE SNIPPET: static MagickBooleanType GetEXIFProperty(const Image *image,
const char *property)
{
#define MaxDirectoryStack 16
#define EXIF_DELIMITER "\n"
#define EXIF_NUM_FORMATS 12
#define EXIF_FMT_BYTE 1
#define EXIF_FMT_STRING 2
#define EXIF_FMT_USHORT 3
#define EXIF_FMT_ULONG 4
#define EXIF_FMT_URATIONAL 5
#define EXIF_FMT_SBYTE 6
#define EXIF_FMT_UNDEFINED 7
#define EXIF_FMT_SSHORT 8
#define EXIF_FMT_SLONG 9
#define EXIF_FMT_SRATIONAL 10
#define EXIF_FMT_SINGLE 11
#define EXIF_FMT_DOUBLE 12
#define TAG_EXIF_OFFSET 0x8769
#define TAG_GPS_OFFSET 0x8825
#define TAG_INTEROP_OFFSET 0xa005
#define EXIFMultipleValues(size,format,arg) \
{ \
ssize_t \
component; \
\
size_t \
length; \
\
unsigned char \
*p1; \
\
length=0; \
p1=p; \
for (component=0; component < components; component++) \
{ \
length+=FormatLocaleString(buffer+length,MaxTextExtent-length, \
format", ",arg); \
if (length >= (MaxTextExtent-1)) \
length=MaxTextExtent-1; \
p1+=size; \
} \
if (length > 1) \
buffer[length-2]='\0'; \
value=AcquireString(buffer); \
}
#define EXIFMultipleFractions(size,format,arg1,arg2) \
{ \
ssize_t \
component; \
\
size_t \
length; \
\
unsigned char \
*p1; \
\
length=0; \
p1=p; \
for (component=0; component < components; component++) \
{ \
length+=FormatLocaleString(buffer+length,MaxTextExtent-length, \
format", ",(arg1),(arg2)); \
if (length >= (MaxTextExtent-1)) \
length=MaxTextExtent-1; \
p1+=size; \
} \
if (length > 1) \
buffer[length-2]='\0'; \
value=AcquireString(buffer); \
}
typedef struct _DirectoryInfo
{
const unsigned char
*directory;
size_t
entry;
ssize_t
offset;
} DirectoryInfo;
typedef struct _TagInfo
{
size_t
tag;
const char
description[36];
} TagInfo;
static const TagInfo
EXIFTag[] =
{
{ 0x001, "exif:InteroperabilityIndex" },
{ 0x002, "exif:InteroperabilityVersion" },