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338 lines
10 KiB
C++
338 lines
10 KiB
C++
// ***************************************************************** -*- C++ -*-
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/*
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* Copyright (C) 2004 Andreas Huggel <ahuggel@gmx.net>
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*
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* This program is part of the Exiv2 distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/*
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File: exivsimple.cpp
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Version: $Rev$
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Author(s): Brad Schick <brad@robotbattle.com>
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History: 12-Nov-04, brad: created
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*/
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// *****************************************************************************
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#include "stdafx.h"
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#include "exivsimple.h"
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#include "image.hpp"
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#include "exif.hpp"
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#include "iptc.hpp"
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#include <cassert>
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struct ImageWrapper
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{
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Exiv2::Image::AutoPtr image;
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};
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// Returns 0 if failed.
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EXIVSIMPLE_API HIMAGE OpenImage(const char *file)
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{
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assert(file);
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ImageWrapper *imgWrap = new ImageWrapper;
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// See if file exists. Sorry for very bad error handling
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if (INVALID_FILE_ATTRIBUTES == GetFileAttributes(file)) {
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return 0;
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}
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imgWrap->image = Exiv2::ImageFactory::open(file);
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if (imgWrap->image.get() == 0) {
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return 0;
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}
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// Load existing metadata
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if (imgWrap->image->readMetadata()) {
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delete imgWrap;
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imgWrap = 0;
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}
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return (HIMAGE)imgWrap;
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}
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EXIVSIMPLE_API void FreeImage(HIMAGE img)
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{
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if (img) {
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ImageWrapper *imgWrap = (ImageWrapper*)img;
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delete imgWrap;
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}
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}
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EXIVSIMPLE_API int SaveImage(HIMAGE img)
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{
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assert(img);
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ImageWrapper *imgWrap = (ImageWrapper*)img;
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return imgWrap->image->writeMetadata();
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}
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// This is weird because iptc and exif have not been "unified". Once
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// they are unified, this DLL should not have to know
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// about either... just generic images, keys, values, etc.
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//
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// buffsize should be the total size of *buff (including space for null)
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// Note that if there is more than one entry (for some IPTC datasets) this
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// returns the first one found. Currently no way to get the others.
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EXIVSIMPLE_API int ReadMeta(HIMAGE img, const char *key, char *buff, int buffsize)
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{
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assert(img && key && buff);
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if (img==0 || key==0 || buff==0 || buffsize==0) return -1;
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ImageWrapper *imgWrap = (ImageWrapper*)img;
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int rc = 2;
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Exiv2::IptcData &iptcData = imgWrap->image->iptcData();
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Exiv2::ExifData &exifData = imgWrap->image->exifData();
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try {
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// First try iptc
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Exiv2::IptcKey iptcKey(key);
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rc = 1;
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Exiv2::IptcData::const_iterator iter = iptcData.findKey(iptcKey);
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if (iter != iptcData.end()) {
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strncpy(buff, iter->value().toString().c_str(), buffsize);
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buff[buffsize-1] = 0;
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rc = 0;
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}
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}
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catch(const Exiv2::Error&) {
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}
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if (rc) {
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// No iptc value, so try exif
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try {
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Exiv2::ExifKey exifKey(key);
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rc = 1;
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Exiv2::ExifData::const_iterator iter = exifData.findKey(exifKey);
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if (iter != exifData.end()) {
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strncpy(buff, iter->value().toString().c_str(), buffsize);
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buff[buffsize-1] = 0;
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rc = 0;
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}
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}
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catch(const Exiv2::Error&) {
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}
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}
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return rc;
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}
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// Overwrites existing value if found, otherwise creates a new one.
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// Passing invalidTypeId causes the type to be guessed.
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// Guessing types is accurate for IPTC, but not for EXIF.
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EXIVSIMPLE_API int ModifyMeta(HIMAGE img, const char *key, const char *val, DllTypeId type)
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{
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assert(img && key && val);
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if (img==0 || key==0 || val==0) return -1;
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ImageWrapper *imgWrap = (ImageWrapper*)img;
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int rc = 2;
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Exiv2::IptcData &iptcData = imgWrap->image->iptcData();
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Exiv2::ExifData &exifData = imgWrap->image->exifData();
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std::string data(val);
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// if data starts and ends with quotes, remove them
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if (data.at(0) == '\"' && data.at(data.size()-1) == '\"') {
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data = data.substr(1, data.size()-2);
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}
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try {
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Exiv2::IptcKey iptcKey(key);
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rc = 1;
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if (type == invalidTypeId)
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type = (DllTypeId)Exiv2::IptcDataSets::dataSetType(iptcKey.tag(), iptcKey.record());
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Exiv2::Value::AutoPtr value = Exiv2::Value::create((Exiv2::TypeId)type);
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value->read(data);
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Exiv2::IptcData::iterator iter = iptcData.findKey(iptcKey);
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if (iter != iptcData.end()) {
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iter->setValue(value.get());
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rc = 0;
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}
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else {
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rc = iptcData.add(iptcKey, value.get());
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}
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}
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catch(const Exiv2::Error&) {
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}
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if (rc) {
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// Failed with iptc, so try exif
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try {
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Exiv2::ExifKey exifKey(key);
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rc = 1;
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// No way to get value type for exif... string is the most common
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if (type == invalidTypeId)
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type = asciiString;
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Exiv2::Value::AutoPtr value = Exiv2::Value::create((Exiv2::TypeId)type);
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value->read(data);
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Exiv2::ExifData::iterator iter = exifData.findKey(exifKey);
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if (iter != exifData.end()) {
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iter->setValue(value.get());
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rc = 0;
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}
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else {
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exifData.add(exifKey, value.get());
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rc = 0;
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}
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}
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catch(const Exiv2::Error&) {
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}
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}
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return rc;
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}
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// Always creates a new metadata entry.
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// Passing invalidTypeId causes the type to be guessed.
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// Guessing types is accurate for IPTC, but not for EXIF.
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EXIVSIMPLE_API int AddMeta(HIMAGE img, const char *key, const char *val, DllTypeId type)
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{
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assert(img && key && val);
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if (img==0 || key==0 || val==0) return -1;
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ImageWrapper *imgWrap = (ImageWrapper*)img;
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int rc = 2;
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Exiv2::IptcData &iptcData = imgWrap->image->iptcData();
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Exiv2::ExifData &exifData = imgWrap->image->exifData();
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std::string data(val);
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// if data starts and ends with quotes, remove them
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if (data.at(0) == '\"' && data.at(data.size()-1) == '\"') {
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data = data.substr(1, data.size()-2);
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}
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try {
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Exiv2::IptcKey iptcKey(key);
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rc = 1;
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if (type == invalidTypeId)
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type = (DllTypeId)Exiv2::IptcDataSets::dataSetType(iptcKey.tag(), iptcKey.record());
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Exiv2::Value::AutoPtr value = Exiv2::Value::create((Exiv2::TypeId)type);
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value->read(data);
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rc = iptcData.add(iptcKey, value.get());
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}
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catch(const Exiv2::Error&) {
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}
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if (rc) {
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// Failed with iptc, so try exif
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try {
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Exiv2::ExifKey exifKey(key);
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rc = 1;
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// No way to get value type for exif... string is the most common
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if (type == invalidTypeId)
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type = asciiString;
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Exiv2::Value::AutoPtr value = Exiv2::Value::create((Exiv2::TypeId)type);
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value->read(data);
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exifData.add(exifKey, value.get());
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rc = 0;
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}
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catch(const Exiv2::Error&) {
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}
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}
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return rc;
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}
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// If multiple entires exist, this only remove the first one
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// found. Call multiple times to remove many.
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EXIVSIMPLE_API int RemoveMeta(HIMAGE img, const char *key)
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{
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assert(img && key);
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if (img==0 || key==0) return -1;
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ImageWrapper *imgWrap = (ImageWrapper*)img;
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int rc = 2;
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Exiv2::IptcData &iptcData = imgWrap->image->iptcData();
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Exiv2::ExifData &exifData = imgWrap->image->exifData();
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try {
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Exiv2::IptcKey iptcKey(key);
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rc = 1;
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Exiv2::IptcData::iterator iter = iptcData.findKey(iptcKey);
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if (iter != iptcData.end()) {
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iptcData.erase(iter);
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rc = 0;
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}
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}
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catch(const Exiv2::Error&) {
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}
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if (rc) {
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// No iptc value, so try exif
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try {
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Exiv2::ExifKey exifKey(key);
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rc = 1;
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Exiv2::ExifData::iterator iter = exifData.findKey(exifKey);
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if (iter != exifData.end()) {
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exifData.erase(iter);
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rc = 0;
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}
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}
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catch(const Exiv2::Error&) {
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}
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}
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return rc;
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}
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EXIVSIMPLE_API int EnumMeta(HIMAGE img, METAENUMPROC proc, void *user)
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{
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assert(img && proc);
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if (img==0 || proc==0) return -1;
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ImageWrapper *imgWrap = (ImageWrapper*)img;
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bool more = true;
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Exiv2::IptcData &iptcData = imgWrap->image->iptcData();
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Exiv2::ExifData &exifData = imgWrap->image->exifData();
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Exiv2::IptcData::const_iterator iend = iptcData.end();
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for (Exiv2::IptcData::const_iterator i = iptcData.begin();
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i != iend && more; ++i) {
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more = proc(i->key().c_str(), i->value().toString().c_str(), user);
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}
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Exiv2::ExifData::const_iterator eend = exifData.end();
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for (Exiv2::ExifData::const_iterator e = exifData.begin();
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e != eend && more; ++e) {
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more = proc(e->key().c_str(), e->value().toString().c_str(), user);
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}
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return 0;
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}
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BOOL APIENTRY DllMain( HANDLE hModule,
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DWORD ul_reason_for_call,
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LPVOID lpReserved
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)
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{
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switch (ul_reason_for_call) {
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case DLL_PROCESS_ATTACH:
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case DLL_THREAD_ATTACH:
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case DLL_THREAD_DETACH:
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case DLL_PROCESS_DETACH:
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break;
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}
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return TRUE;
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}
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