Class: Exif

Inherits:
Object
  • Object
show all
Defined in:
ext/exif.c

Defined Under Namespace

Modules: ByteOrder, IFD Classes: Error, NotExifFormat

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.[](tagid) ⇒ Object 



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# File 'ext/exif.c', line 317

static VALUE
rb_exif_s_get_tag_description(VALUE klass, VALUE tagid)
{
	ExifTag tag;
	VALUE cdr;
	char buf[7];
	switch (TYPE(tagid)){
	  case T_FIXNUM:
	    tag = FIX2INT(tagid);
		if (!exif_tag_get_name(tag))
			rb_raise(eExifError, "invalid tag id: 0x%04x(%d)", 
			         FIX2INT(tagid), FIX2INT(tagid));
		break;
	  case T_STRING:
	    tag = exif_tag_from_string(RSTRING(tagid)->ptr);
		if (!tag || !exif_tag_get_name(tag)) {
			rb_raise(eExifError, "invalid tag: '%s'", RSTRING(tagid)->ptr);
		}
		break;
	  default:
	    rb_raise(rb_eTypeError, "wrong type of an argument");
		break;
	}
	memset(buf, 0, sizeof(buf));
	sprintf(buf, "0x%04x", tag);
	cdr = rb_ary_new();
	rb_ary_push(cdr, rb_str_new2(exif_tag_get_name(tag)));
	rb_ary_push(cdr, rb_str_new2(exif_tag_get_description(tag)));
	rb_ary_push(cdr, rb_str_new2(buf));
	return rb_assoc_new(rb_str_new2(exif_tag_get_title(tag)), cdr);
}

.new(*args) ⇒ Object 



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# File 'ext/exif.c', line 47

static VALUE
rb_exif_s_new(int argc, VALUE *argv, VALUE klass)
{
	VALUE obj;
	Exif *exif;
	exif = ALLOC(Exif);
	exif->ed = NULL;
	exif->ifd = IFD_RB_DEFAULT;
	obj =  Data_Wrap_Struct(klass, 0, rb_exif_free, exif);
	rb_obj_call_init(obj, argc, argv);
	return obj;
}

Instance Method Details

#[](tagid) ⇒ Object 



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# File 'ext/exif.c', line 211

static VALUE
rb_exif_get_tag(VALUE obj, VALUE tagid)
{
	Exif *exif;
	ExifTag tag;
	ExifEntry *e;
	const char *found;
	int i;
	char value[1024];

	Get_Exif(obj, exif);
	switch (TYPE(tagid)) {
	  case T_STRING:
		tag = exif_tag_from_string(RSTRING(tagid)->ptr);
		if (!tag){
			rb_raise(eExifError, "invalid tag: '%s'", RSTRING(tagid)->ptr);
		}
		break;
	  case T_FIXNUM:
		tag = exif_tag_from_tagid(FIX2INT(tagid));
		if (!tag){
			rb_raise(eExifError, "invalid tag: 0x%04x", tagid);
		}
		break;
	  default:
		rb_raise(rb_eTypeError, "wrong type of arguments");
		break;
	}
	if (exif->ifd >= 0){
		e = exif_content_get_entry(exif->ed->ifd[exif->ifd], tag);
		if (!e){
			rb_raise(eExifTagNotFound, 
			"IFD '%s' does not contain tag '%s'(0x%04x)",
			exif_ifd_get_name(exif->ifd), exif_tag_get_title(tag), tag);
		}
		return rb_str_new2(exif_entry_get_value(e, value, sizeof(value)));
	}
	for (i = 0; i < EXIF_IFD_COUNT; i++){
		e = exif_content_get_entry(exif->ed->ifd[i], tag);
		if (e)
			break;
	}
	found = exif_entry_get_value(e, value, sizeof(value));
	return found ? rb_str_new2(found) : Qnil;
}

#[]=(tagid, val) ⇒ Object

exif_entry_dump(e, 1);



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# File 'ext/exif.c', line 266

static VALUE
rb_exif_set_tag(VALUE obj, VALUE tagid, VALUE val)
{
	Exif *exif;
	ExifTag tag;
	ExifEntry *e;
	
	rb_raise(rb_eNotImpError, "soryy, not yet implemented");
	Check_Type(tagid, T_STRING);
	Check_Type(val, T_STRING);
	Get_Exif(obj, exif);
	tag = exif_tag_from_string(RSTRING(tagid)->ptr);
	if (!tag || !exif_tag_get_name(tag)){
		rb_raise(eExifError, "invalid tag: '%s'", RSTRING(tagid)->ptr);
	}
	e = exif_content_get_entry(exif->ed->ifd[exif->ifd], tag);
	if (!e){
		e = exif_entry_new();
		exif_content_add_entry(exif->ed->ifd[exif->ifd], e);
		exif_entry_initialize(e, tag);
	}
	rb_exif_set_tag_0(exif->ed, e, val);
	return obj;
}

#byte_order ⇒ Object 



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# File 'ext/exif.c', line 115

static VALUE
rb_exif_get_byte_order(VALUE obj)
{
	Exif *exif;
	Get_Exif(obj, exif);
	return FIX2INT(exif_data_get_byte_order(exif->ed));
}

#byte_order=(byteorder) ⇒ Object 



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# File 'ext/exif.c', line 123

static VALUE
rb_exif_set_byte_order(VALUE obj, VALUE byteorder)
{
	Exif *exif;
	Get_Exif(obj, exif);
	exif_data_set_byte_order(exif->ed, FIX2INT(byteorder));
	return obj;
}

#data=(str) ⇒ Object Also known as: << 



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# File 'ext/exif.c', line 106

static VALUE
rb_exif_set_data(VALUE obj, VALUE str)
{
	Exif *exif;
	Data_Get_Struct(obj, Exif, exif);
	rb_exif_data_new_from_data(exif->ed, str);
	return obj;
}

#each_entry(*args) ⇒ Object 



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# File 'ext/exif.c', line 153

static VALUE
rb_exif_each(int argc, VALUE *argv, VALUE obj)
{
	Exif *exif;
	VALUE use_tag_id;
	unsigned char ids = 0;
	if (rb_scan_args(argc, argv, "01", &use_tag_id) == 1){
		ids = FIX2UINT(use_tag_id);	
	}
	Get_Exif(obj, exif);
	exif_data_foreach_content(exif->ed, rb_exif_data_foreach_content_func, &ids);
	return obj;
}

#extract_thumbnail(dest) ⇒ Object Also known as: thumbnail 



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# File 'ext/exif.c', line 349

static VALUE
rb_exif_extract_thumbnail(VALUE obj, VALUE dest)
{
	Exif *exif;
	Get_Exif(obj, exif);
	if (!exif->ed->data)
		rb_raise(eExifThumbnailNotFound, "thumbnail not found");
	rb_funcall(dest, rb_intern("<<"), 1, rb_str_new((char *)exif->ed->data, exif->ed->size));
	return obj;
}

#ifd ⇒ Object 



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# File 'ext/exif.c', line 196

static VALUE
rb_exif_get_ifd(VALUE obj)
{
	Exif *exif;
	const char *name;
	Get_Exif(obj, exif);
	name = exif_ifd_get_name(exif->ifd);
	if (!name)
		return Qnil;
	return rb_str_new2(name);
}

#ifd=(ifd) ⇒ Object 



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# File 'ext/exif.c', line 169

static VALUE
rb_exif_set_ifd(VALUE obj, VALUE ifd)
{
	Exif *exif;
	int i;
	Get_Exif(obj, exif);
	switch(TYPE(ifd)){
	  case T_FIXNUM:
		i = FIX2INT(ifd);
		if (i < IFD_RB_DEFAULT || i > EXIF_IFD_INTEROPERABILITY){
			rb_raise(rb_eRuntimeError, "wrong constant");
		}
		break;
	  case T_STRING:
		i = exif_ifd_from_string(RSTRING(ifd)->ptr);
		if (i == -1){
			rb_raise(rb_eRuntimeError, "unknown IFD: '%s'", RSTRING(ifd)->ptr);
		}
		break;
	  default:
		rb_raise(rb_eTypeError, "wrong type of an argument");
		break;
	}
	exif->ifd = i;
	return obj;
}

#list_tags(ifd) ⇒ Object 



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# File 'ext/exif.c', line 290

static VALUE
rb_exif_list_tags_at_ifd(VALUE obj, VALUE ifd)
{
	Exif *exif;
	unsigned int tag;
	int i;
	const char *name;
	char buf[7];
	VALUE ret = rb_ary_new();
	i = FIX2INT(ifd);
	if (i < EXIF_IFD_0 || i > EXIF_IFD_INTEROPERABILITY){
			rb_raise(rb_eRuntimeError, "wrong constant");
	}
	Get_Exif(obj, exif);
	for (tag = 0; tag < 0xffff; tag++) {
		name = exif_tag_get_title(tag);
		if (!name)
			continue;
		if (exif_content_get_entry(exif->ed->ifd[i], tag)){
			memset(buf, 0, sizeof(buf));
			sprintf(buf, "0x%04x", tag);
			rb_ary_push(ret, rb_assoc_new(rb_str_new2(name), rb_str_new2(buf)));
		}
	}
	return ret;
}

#thumbnail=(src) ⇒ Object 



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# File 'ext/exif.c', line 360

static VALUE
rb_exif_set_thumbnail(VALUE obj, VALUE src)
{
	Exif *exif;
	Get_Exif(obj, exif);
	if (exif->ed->data){
		free(exif->ed->data);
		exif->ed->data = NULL;
		exif->ed->size = 0;
	}
	Check_Type(src, T_STRING);
	exif->ed->size = RSTRING(src)->len;
	exif->ed->data = xmalloc(sizeof(char)*exif->ed->size);
	MEMMOVE(exif->ed->data, RSTRING(src)->ptr, char, exif->ed->size);
	return obj;
}