/*
?*?File:	exif.cpp
?*?Purpose:	cpp?EXIF?reader
?*?16/Mar/2003?
?*?based?on?jhead-1.8?by?Matthias?Wandel?
?*/

#include?“exif.h“

////////////////////////////////////////////////////////////////////////////////
Cexif::Cexif（EXIFINFO*?info）
{
	if?（info）?{
		m_exifinfo?=?info;
		freeinfo?=?false;
	}?else?{
		m_exifinfo?=?new?EXIFINFO;
		memset（m_exifinfo0sizeof（EXIFINFO））;
		freeinfo?=?true;
	}

	m_szLastError[0]=‘\0‘;
	ExifImageWidth?=?MotorolaOrder?=?0;
	SectionsRead=0;
	memset（&Sections?0?MAX_SECTIONS?*?sizeof（Section_t））;
}
////////////////////////////////////////////////////////////////////////////////
Cexif::~Cexif（）
{
	for（int?i=0;i	if?（freeinfo）?delete?m_exifinfo;
}
////////////////////////////////////////////////////////////////////////////////
bool?Cexif::DecodeExif（FILE?*?hFile）
{
????int?a;
????int?HaveCom?=?0;

????a?=?fgetc（hFile）;

????if?（a?!=?0xff?||?fgetc（hFile）?!=?M_SOI）{
????????return?0;
????}

????for（;;）{
????????int?itemlen;
????????int?marker?=?0;
????????int?lllh?got;
????????unsigned?char?*?Data;

????????if?（SectionsRead?>=?MAX_SECTIONS）{
			strcpy（m_szLastError“Too?many?sections?in?jpg?file“）;
			return?0;
????????}

????????for?（a=0;a<7;a++）{
????????????marker?=?fgetc（hFile）;
????????????if?（marker?!=?0xff）?break;

????????????if?（a?>=?6）{
????????????????printf（“too?many?padding?unsigned?chars\n“）;
????????????????return?0;
????????????}
????????}

????????if?（marker?==?0xff）{
????????????//?0xff?is?legal?padding?but?if?we?get?that?many?something‘s?wrong.
????????????strcpy（m_szLastError“too?many?padding?unsigned?chars!“）;
			return?0;
????????}

????????Sections[SectionsRead].Type?=?marker;

????????//?Read?the?length?of?the?section.
????????lh?=?fgetc（hFile）;
????????ll?=?fgetc（hFile）;

????????itemlen?=?（lh?<
????????if?（itemlen?????????????strcpy（m_szLastError“invalid?marker“）;
			return?0;
????????}

????????Sections[SectionsRead].Size?=?itemlen;

????????Data?=?（unsigned?char?*）malloc（itemlen）;
????????if?（Data?==?NULL）{
????????????strcpy（m_szLastError“Could?not?allocate?memory“）;
			return?0;
????????}
????????Sections[SectionsRead].Data?=?Data;

????????//?Store?first?two?pre-read?unsigned?chars.
????????Data[0]?=?（unsigned?char）lh;
????????Data[1]?=?（unsigned?char）ll;

????????got?=?fread（Data+2?1?itemlen-2hFile）;?//?Read?the?whole?section.
????????if?（got?!=?itemlen-2）{
????????????strcpy（m_szLastError“Premature?end?of?file?“）;
			return?0;
????????}
????????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?（ReadMode?&?READ_IMAGE）{
????????????????????int?cp?ep?size;
?????????????

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-12-26?21:30??EXIF\
?????文件???????22496??2018-12-26?20:26??EXIF\ExifTest.aps
?????文件????????1285??2018-12-26?20:26??EXIF\ExifTest.cpp
?????文件????????4277??2003-03-16?22:19??EXIF\ExifTest.dsp
?????文件????????1206??2018-12-26?20:26??EXIF\ExifTest.h
?????文件????????4447??2003-03-16?21:49??EXIF\ExifTest.rc
?????文件?????????882??2017-03-14?22:13??EXIF\ExifTest.sln
?????文件????????8042??2018-12-26?20:23??EXIF\ExifTest.vcxproj
?????文件????????2059??2018-12-26?20:34??EXIF\ExifTest.vcxproj.filters
?????文件?????????149??2018-12-26?20:34??EXIF\ExifTest.vcxproj.user
?????文件???????10248??2018-12-26?20:44??EXIF\ExifTestDlg.cpp
?????文件????????1516??2018-12-26?20:26??EXIF\ExifTestDlg.h
?????目錄???????????0??2018-12-26?21:30??EXIF\RES\
?????文件????????1078??2003-03-16?21:47??EXIF\RES\ExifTest.ico
?????文件?????????400??2003-03-16?21:47??EXIF\RES\ExifTest.rc2
?????文件?????????550??2018-12-26?20:26??EXIF\Resource.h
?????文件?????????212??2018-12-26?20:27??EXIF\StdAfx.cpp
?????文件????????1001??2018-12-26?20:26??EXIF\StdAfx.h
?????文件???????27936??2018-12-26?20:26??EXIF\exif.cpp
?????文件????????3482??2018-12-26?20:26??EXIF\exif.h
?????文件?????1174016??2018-12-26?21:25??實驗三-王玉峰-EXIF讀寫-20161745.doc