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|
/*
/--------------------------------------------------------------------
|
| $Id: plexif.h,v 1.5 2004/06/06 12:56:38 uzadow Exp $
|
| Copyright (c) 1996-2003 Ulrich von Zadow
|
| Implementation of PLExif class by Mike Franklin
| Much of the decoding code was adapted from code by Ken Reneris:
| http://www.reneris.com/tools/exif.asp -
| though it has been heavily modified!
|
|
\--------------------------------------------------------------------
*/
#ifndef INCL_PLEXIF
#define INCL_PLEXIF
#ifdef _MSC_VER // The microsoft compiler generates masses
// of symbol too long
#pragma warning(disable: 4786) // for debugger warnings for sets and maps
#endif
#include "plpaintlibdefs.h"
#include "plcountedpointer.h"
#include <cstdio>
#include <vector>
#include <string>
#include <map>
struct jpeg_decompress_struct;
struct jpeg_compress_struct;
// these structures are for internal use only
struct _PLExifTranslator;
struct _PLExifTagValues;
struct _PLExifFormatter;
class PLExifTag;
typedef PLCountedPointer<PLExifTag> PLExifTagCPtr; // PLExifTag counted pointer
typedef std::vector<PLExifTagCPtr> PLExifTagList; // vector of PLExifTag counted pointers
typedef PLCountedArrayPointer<PLBYTE> PLByteCPtr; // utility typedef
class PLExif
{
public:
PLExif();
~PLExif();
// default copying is safe
// reset the internal data
void Clear();
// Access the raw EXIF data (just a copy of the EXIF header held in memory)
size_t GetRawDataSize() const;
PLBYTE * GetRawData();
const PLBYTE * GetRawData() const;
/*
// These are not EXIF comments and should probably be moved to PLBmpInfo
const std::string & GetComment() const;
const char * GetCommmentCStr() const;
void SetComment(const std::string &);
void SetComment(const char *);
*/
// Access to the Main, Sub and Manufacturer tags
// also a single list that contains them all
const PLExifTagList & GetAllTags() const;
const PLExifTagList & GetMainTags() const;
const PLExifTagList & GetSubTags() const;
const PLExifTagList & GetManufacturerTags() const;
// As above but returning a traditional C style array pointer
// instead of an STL vector
// It is an array of pointers to PLExifTag
const PLExifTagCPtr * GetAllTagsC(size_t & size) const;
const PLExifTagCPtr * GetMainTagsC(size_t & size) const;
const PLExifTagCPtr * GetSubTagsC(size_t & size) const;
const PLExifTagCPtr * GetManufacturerTagsC(size_t & size) const;
// All the following functions give access to a tag given a tag shortname
// they almost all return a pointer to the whole tag but mostly this
// will just be used to check whether the tag was found by testing for
// a NULL pointer. The useful data - the tag value is generally returned
// by reference.
//
// duplicate copies of the functions allow efficient use whether
// the source tag string is a std::string or a char *
// All forms return a pointer to the found tag, 0 if not found
// Just return the tag pointer
PLExifTag * GetTag(const char * TagShortName) const;
PLExifTag * GetTag(const std::string & TagShortName) const
{ return GetTag(TagShortName.c_str()); }
// place the tag value into the Value string, format is basic
// as stored in the raw EXIF data eg f4.0 is likely to be 40/10
PLExifTag * GetTag(const char * TagShortName, std::string & Value) const;
PLExifTag * GetTag(const std::string & TagShortName, std::string & Value) const
{ return GetTag(TagShortName.c_str(), Value); }
// place the tag value in the Value string, format is common form
// eg f4.0 is 4.0 rather than 40/10
PLExifTag * GetTagCommon(const char * TagShortName, std::string & Value) const;
PLExifTag * GetTagCommon(const std::string & TagShortName, std::string & Value) const
{ return GetTagCommon(TagShortName.c_str(), Value); }
// place the tag value in the Value double where appropriate
// eg 1.234m focus
PLExifTag * GetTag(const char * TagShortName, double & Value) const;
PLExifTag * GetTag(const std::string & TagShortName, double & Value) const
{ return GetTag(TagShortName.c_str(), Value); }
// return tag value as a string (empty string if not found), format is basic
// as stored in the raw EXIF data eg f4.0 is likely to be 40/10
std::string & TagStr(const char * TagShortName) const;
std::string & TagStr(const std::string & TagShortName) const
{ return TagStr(TagShortName.c_str()); }
// return tag value as a string (empty string if not found)
// format is common form eg f4.0 is 4.0 rather than 40/10
std::string & TagStrCommon(const char * TagShortName) const;
std::string & TagStrCommon(const std::string & TagShortName) const
{ return TagStrCommon(TagShortName.c_str()); }
// C string return versions of TagStr and TagStrCommon
// return tag value as a string (empty string if not found), format is basic
// as stored in the raw EXIF data eg f4.0 is likely to be 40/10
const char * TagCStr(const char * TagShortName) const;
const char * TagCStr(const std::string & TagShortName) const
{ return TagCStr(TagShortName.c_str()); }
// return tag value as a string (empty string if not found)
// format is common form eg f4.0 is 4.0 rather than 40/10
const char * TagCStrCommon(const char * TagShortName) const;
const char * TagCStrCommon(const std::string & TagShortName) const
{ return TagCStrCommon(TagShortName.c_str()); }
// These two methods are primarily intended for use only by the Paintlib encoders and decoders
// load data from cinfo - jpeg_save_markers must have been called first
void ReadData(const jpeg_decompress_struct * pcinfo);
// write data to cinfo - after jpeg_start_compress
void WriteData(jpeg_compress_struct * pcinfo);
private:
void decode(); // do the actual decoding of the EXIF data
void ReadIFD(const _PLExifTagValues * Tags, char * Prefix, PLExifTagList & sectionList);
void ExpandBinaryTag(const std::string & Src, const _PLExifTagValues *Tags, PLUINT Type, PLExifTagList & sectionList);
void DecodeCanCustomFncs(const PLExifTag & rootTag, const _PLExifTagValues *Tags, PLExifTagList & sectionList);
void CopyTag(const char * Src, const char * Dst);
void SetTag(const char * Dst, const char * Value);
void SetTag(const char * Dst, const std::string & Value)
{ SetTag(Dst, Value.c_str()); }
void AddTag(const char * Dst, const char * SrcTag, const char * Skip = NULL, const char * Sep = NULL);
void AddStr(const char * Dst, const std::string & SrcStr, const char * Skip = NULL, const char * Sep = NULL);
void FormatRange(double Low, double High, std::string & Str);
// these functions were originally designed to read from a file
// they have been kept but are now "reading" from the vector m_Data
// I may remove at least the first couple later
void SetPos(size_t Pos);
size_t GetPos();
PLWORD GetU16();
PLLONG GetU32();
void Read(void * Buffer, size_t Size);
private:
PLByteCPtr m_Data;
size_t m_DataSize;
// this should probably be moved to PLBmpInfo
// std::string m_Comment; // include comments even though they're not really EXIF
size_t m_Pos; // offset into data (effectively index into m_Data
size_t m_IdfOffset;
bool m_Endian;
PLExifTagList m_AllTags; // Tags in the order found
PLExifTagList m_MainTags;
PLExifTagList m_SubTags;
PLExifTagList m_ManufacturerTags;
typedef std::map<std::string, PLExifTagCPtr> TagMap;
TagMap m_Tags; // tag look up for searching by short name
};
class PLExifTag
{
public:
// default copying is safe
~PLExifTag();
// C Interface - returning const char *
const char * GetShortNameCStr() const;
const char * GetDescriptionCStr() const;
// Format is basic as stored in the raw EXIF data
// eg f4.0 is likely to be 40/10
const char * GetValueCStr() const;
// format is common form eg f4.0 is 4.0 rather than 40/10
const char * GetValueCommonCStr() const;
// STL Interface - returning const string &
const std::string & GetShortName() const;
const std::string GetDescription() const;
// Format is basic as stored in the raw EXIF data
// eg f4.0 is likely to be 40/10
const std::string & GetValue() const;
// format is common form eg f4.0 is 4.0 rather than 40/10
const std::string & GetValueCommon() const;
private:
// render functions to convert from raw memory data
size_t RenDef(PLBYTE * & Buffer);
size_t RenUDef(PLBYTE * & Buffer);
size_t RenUndef(PLBYTE * & Buffer);
size_t RenStr(PLBYTE * & Buffer);
size_t RenURat(PLBYTE * & Buffer);
size_t RenRat(PLBYTE * & Buffer);
// conversion to common values
void CnvRat(std::string & result); // evaluate nominator/denominator
void CnvRatAp(std::string & result); // evaluate nominator/denominator for fstop
void CnvFrac(std::string & result); // evaluate nominator/denominator if > than 1
void CnvApexShutter(std::string & result);
void CnvApexAp(std::string & result);
void CnvCompCfg(std::string & result); // component configuration
void CnvCanINo(std::string & result); // decode canon image no
void CnvCanSNo(std::string & result); // decode canon serial no
void CnvCanFlash(std::string & result); // canon flash details
void CnvCanAFPnt(std::string & result); // canon AF focus point used
// friends to let them have access to the conversion and rendering
// functions without having to make them public to the whole world
friend struct _PLExifTagValues;
friend struct _PLExifFormatter;
private:
PLExifTag(PLUINT TagNo, PLUINT Format, PLUINT NoComp); // only ever created by friend PLExif
void CleanWorkingArea(); // call after all decoding done to free mem buffer
void Swizzle();
void Render();
void DoTranslation();
void Value(size_t Index);
double GetDouble(size_t Index);
const _PLExifTagValues * m_Tag; // The tag for this item - pointer to static data so copy safe
const _PLExifFormatter * m_Fmt; // The format type - pointer to static data so copy safe
std::string m_ShortName; // Copy of the short name
std::string m_Lookup; // Lowercase version of shortname
size_t m_TagNo; // The tag no
size_t m_Format; // Format of this item
size_t m_NoComp; // Number of components
size_t m_Size; // Total size of item
PLByteCPtr m_Buffer; // Copy of the item's data
size_t m_Pos; // Location of tag
// The rendered value
std::string m_Value; // In printable form
std::string m_Common; // in printable common form
PLLONG m_Num; // Numerator
PLLONG m_Den; // Denominator
PLLONG m_Int; // As int
PLUINT m_UInt; // As unsigned int
double m_Double; // As double
private:
// not too thrilled with this but I inherited it!
// however it does avoid having to put stuff into
// the public interface that only PLExif will need
// and will not be needed by the library clients
friend class PLExif;
private:
// these need to be static members to have access to conversion and render functions
static _PLExifTagValues MainTags[];
static _PLExifTagValues SubTags[];
static _PLExifTagValues NikonTags[];
static _PLExifTagValues Nikon2Tags[];
static _PLExifTagValues OlympusTags[];
static _PLExifTagValues CanonTags[];
static _PLExifTagValues CanonSet1[];
static _PLExifTagValues CanonSet2[];
static _PLExifTagValues CanonCFn[];
static _PLExifTagValues FujifilmTags[];
static _PLExifTagValues CasioTags[];
static _PLExifFormatter rgExifFormat[];
};
#endif
|
