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/* exif.hxx
*
* Copyright 2002,2003 Hans Meine <[email protected]>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*/
#ifndef EXIF_HXX
#define EXIF_HXX
#include <libexif/exif-entry.h>
#include <libexif/exif-content.h>
#include <libexif/exif-ifd.h>
#include <libexif/exif-data.h>
#include <libexif/exif-format.h>
#include <libexif/exif-utils.h>
#include <stdexcept>
#include <string>
namespace Exif {
#ifndef EXIF_NO_EXCEPTIONS
struct InvalidIndex : std::runtime_error
{
InvalidIndex(const std::string& s)
: std::runtime_error(s) {}
};
struct InvalidFormat : std::runtime_error
{
InvalidFormat(const std::string& s)
: std::runtime_error(s) {}
};
struct IOError : std::runtime_error
{
IOError(const std::string& s)
: std::runtime_error(s) {}
};
#endif // EXIF_NO_EXCEPTIONS
struct Entry
{
ExifEntry *entry_;
// construct an empty entry, FIXME: is this needed in the public API?
Entry()
: entry_(exif_entry_new())
{}
// construct an entry for the given tag
Entry(ExifTag tag)
: entry_(exif_entry_new())
{
exif_entry_initialize(entry_, tag);
}
// copy constructor
Entry(Entry const &other)
: entry_(other.entry_)
{
exif_entry_ref(entry_);
}
// internal, do not use directly
Entry(ExifEntry *entry)
: entry_(entry)
{
exif_entry_ref(entry_);
}
~Entry()
{
exif_entry_unref(entry_);
}
Entry &operator=(Entry const &other)
{
exif_entry_unref(entry_);
entry_ = other.entry_;
exif_entry_ref(entry_);
return *this;
}
ExifTag tag() const
{
return entry_->tag;
}
/*
void setTag(ExifTag tag)
{
entry_->tag = tag;
}
*/
ExifFormat format() const
{
return entry_->format;
}
/*
void setFormat(ExifFormat format)
{
entry_->format = format;
}
*/
unsigned long components() const
{
return entry_->components;
}
/*
void setComponents(unsigned long components)
{
entry_->components = components;
}
void initialize(ExifTag tag)
{
exif_entry_initialize(entry_, tag);
}
*/
ExifByte getByte(unsigned int index) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_BYTE)
throw InvalidFormat(
"Exif::Entry::getByte(): Format is not EXIF_FORMAT_BYTE");
if(index >= components())
throw InvalidIndex(
"Exif::getByte: component index out of range");
#endif
return *(entry_->data
+ index * exif_format_get_size(entry_->format));
}
const ExifAscii getAscii() const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_ASCII)
throw InvalidFormat(
"Exif::Entry::getAscii(): Format is not EXIF_FORMAT_ASCII");
#endif
return (ExifAscii)entry_->data;
}
ExifShort getShort(unsigned int index) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_SHORT)
throw InvalidFormat(
"Exif::Entry::getShort(): Format is not EXIF_FORMAT_SHORT");
if(index >= components())
throw InvalidIndex(
"Exif::getShort: component index out of range");
#endif
return exif_get_short(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent));
}
ExifLong getLong(unsigned int index) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_LONG)
throw InvalidFormat(
"Exif::Entry::getLong(): Format is not EXIF_FORMAT_LONG");
if(index >= components())
throw InvalidIndex(
"Exif::getLong: component index out of range");
#endif
return exif_get_long(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent));
}
ExifSLong getSLong(unsigned int index) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_SLONG)
throw InvalidFormat(
"Exif::Entry::getSLong(): Format is not EXIF_FORMAT_SLONG");
if(index >= components())
throw InvalidIndex(
"Exif::getSLong: component index out of range");
#endif
return exif_get_slong(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent));
}
ExifRational getRational(unsigned int index) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_RATIONAL)
throw InvalidFormat(
"Exif::Entry::getRational(): Format is not EXIF_FORMAT_RATIONAL");
if(index >= components())
throw InvalidIndex(
"Exif::getRational: component index out of range");
#endif
return exif_get_rational(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent));
}
ExifSRational getSRational(unsigned int index) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_SRATIONAL)
throw InvalidFormat(
"Exif::Entry::getSRational(): Format is not EXIF_FORMAT_SRATIONAL");
if(index >= components())
throw InvalidIndex(
"Exif::getSRational: component index out of range");
#endif
return exif_get_srational(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent));
}
void setByte(unsigned int index, ExifByte value) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_BYTE)
throw InvalidFormat(
"Exif::Entry::setByte(): Format is not EXIF_FORMAT_BYTE");
if(index >= components())
throw InvalidIndex(
"Exif::setByte: component index out of range");
#endif
*(entry_->data
+ index * exif_format_get_size(entry_->format)) = value;
}
/*
const ExifAscii setAscii() const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_ASCII)
throw InvalidFormat(
"Exif::Entry::setAscii(): Format is not EXIF_FORMAT_ASCII");
#endif
return (ExifAscii)entry_->data;
}
*/
void setShort(unsigned int index, ExifShort value) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_SHORT)
throw InvalidFormat(
"Exif::Entry::setShort(): Format is not EXIF_FORMAT_SHORT");
if(index >= components())
throw InvalidIndex(
"Exif::setShort: component index out of range");
#endif
return exif_set_short(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent),
value);
}
void setLong(unsigned int index, ExifLong value) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_LONG)
throw InvalidFormat(
"Exif::Entry::setLong(): Format is not EXIF_FORMAT_LONG");
if(index >= components())
throw InvalidIndex(
"Exif::setLong: component index out of range");
#endif
return exif_set_long(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent),
value);
}
void setSLong(unsigned int index, ExifSLong value) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_SLONG)
throw InvalidFormat(
"Exif::Entry::setSLong(): Format is not EXIF_FORMAT_SLONG");
if(index >= components())
throw InvalidIndex(
"Exif::setSLong: component index out of range");
#endif
return exif_set_slong(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent),
value);
}
void setRational(unsigned int index, ExifRational value) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_RATIONAL)
throw InvalidFormat(
"Exif::Entry::setRational(): Format is not EXIF_FORMAT_RATIONAL");
if(index >= components())
throw InvalidIndex(
"Exif::setRational: component index out of range");
#endif
return exif_set_rational(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent),
value);
}
void setSRational(unsigned int index, ExifSRational value) const
{
#ifndef EXIF_NO_EXCEPTIONS
if(entry_->format != EXIF_FORMAT_SRATIONAL)
throw InvalidFormat(
"Exif::Entry::setSRational(): Format is not EXIF_FORMAT_SRATIONAL");
if(index >= components())
throw InvalidIndex(
"Exif::setSRational: component index out of range");
#endif
return exif_set_srational(entry_->data
+ index * exif_format_get_size(entry_->format),
exif_data_get_byte_order(entry_->parent->parent),
value);
}
const char *value()
{
return exif_entry_get_value(entry_);
}
const char *briefValue()
{
return exif_entry_get_value_brief(entry_);
}
void dump(unsigned int indent = 0) const
{
exif_entry_dump(entry_, indent);
}
};
struct Content
{
ExifContent *content_;
Content()
: content_(exif_content_new())
{}
Content(Content const &other)
: content_(other.content_)
{
exif_content_ref(content_);
}
// internal, do not use directly
Content(ExifContent *content)
: content_(content)
{
exif_content_ref(content_);
}
~Content()
{
exif_content_unref(content_);
}
Content &operator=(Content const &other)
{
exif_content_unref(content_);
content_ = other.content_;
exif_content_ref(content_);
return *this;
}
Entry operator[](ExifTag tag)
{
ExifEntry *result = exif_content_get_entry(content_, tag);
if(result)
return Entry(result);
#ifndef EXIF_NO_EXCEPTIONS
throw InvalidIndex(
"Exif::Content: IFD does not contain given tag");
#endif
return Entry();
}
Entry operator[](unsigned int index)
{
if(index < size())
return Entry(content_->entries[index]);
#ifndef EXIF_NO_EXCEPTIONS
throw InvalidIndex(
"Exif::Content: numeric entry index out of range");
#endif // EXIF_NO_EXCEPTIONS
return Entry();
}
unsigned int size() const
{
// FIXME: content_ should never be NULL, so this is unneeded!?
return content_ ? content_->count : 0;
}
void add(Entry &entry)
{
exif_content_add_entry(content_, entry.entry_);
}
void remove(Entry &entry)
{
exif_content_remove_entry(content_, entry.entry_);
}
// for your convenience
const char *value(ExifTag tag)
{
return exif_content_get_value(content_, tag);
}
// for your convenience
const char *briefValue(ExifTag tag)
{
return exif_content_get_value_brief(content_, tag);
}
void dump(unsigned int indent = 0) const
{
exif_content_dump(content_, indent);
}
};
struct Data
{
ExifData *data_;
Data()
: data_(exif_data_new())
{}
Data(const char *path, bool *success = 0)
: data_(exif_data_new_from_file(path))
{
if(success)
*success = data_;
#ifndef EXIF_NO_EXCEPTIONS
else
if(!data_)
throw IOError("Exif::Data: Could not load file");
#endif // EXIF_NO_EXCEPTIONS
if(!data_)
exif_data_new();
}
Data(const unsigned char *data,
unsigned int size)
: data_(exif_data_new_from_data(data, size))
{}
Data(Data const &other)
: data_(other.data_)
{
exif_data_ref(data_);
}
~Data()
{
exif_data_unref(data_);
}
Data &operator=(Data const &other)
{
exif_data_unref(data_);
data_ = other.data_;
exif_data_ref(data_);
return *this;
}
void save(unsigned char **d, unsigned int *size)
{
exif_data_save_data(data_, d, size);
}
unsigned int size() const
{
return EXIF_IFD_COUNT;
}
Content operator[](unsigned int index)
{
if(index < size())
return Content(data_->ifd[index]);
#ifndef EXIF_NO_EXCEPTIONS
throw InvalidIndex(
"Exif::Data: IFD index out of range");
#endif // EXIF_NO_EXCEPTIONS
return Content();
}
ExifByteOrder byteOrder() const
{
return exif_data_get_byte_order(data_);
}
void setByteOrder(ExifByteOrder bo) const
{
exif_data_set_byte_order(data_, bo);
}
void dump()
{
exif_data_dump(data_);
}
};
} // namespace Exif
#endif // EXIF_HXX
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