Class: Exif::Sigma
- Inherits:
-
Object
- Object
- Exif::Sigma
- Defined in:
- lib/exifparser/makernote/sigma.rb
Instance Method Summary collapse
-
#initialize(fin, tiff_origin, dataPos, byteOrder_module) ⇒ Sigma
constructor
A new instance of Sigma.
- #scan_IFD ⇒ Object
Constructor Details
#initialize(fin, tiff_origin, dataPos, byteOrder_module) ⇒ Sigma
Returns a new instance of Sigma.
178 179 180 181 182 183 184 |
# File 'lib/exifparser/makernote/sigma.rb', line 178 def initialize(fin, tiff_origin, dataPos, byteOrder_module) @fin = fin @tiffHeader0 = tiff_origin @dataPos = dataPos @byteOrder_module = byteOrder_module self.extend @byteOrder_module end |
Instance Method Details
#scan_IFD ⇒ Object
186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 |
# File 'lib/exifparser/makernote/sigma.rb', line 186 def scan_IFD # # Sigma MakerNote starts from 10 byte from the origin # @fin.pos = @dataPos + 10 # # get the number of tags # numDirs = decode_ushort(fin_read_n(2)) # # now scan them # 1.upto(numDirs) { curpos_tag = @fin.pos tag = parseTagID(fin_read_n(2)) tagclass = Tag.find(tag.hex, Tag::SigmaIFDTable) unit, formatter = Tag::Format::Unit[decode_ushort(fin_read_n(2))] count = decode_ulong(fin_read_n(4)) tagdata = fin_read_n(4) obj = tagclass.new(tag, "MakerNote", count) obj.extend formatter, @byteOrder_module obj.pos = curpos_tag if unit * count > 4 curpos = @fin.pos begin @fin.pos = @tiffHeader0 + decode_ulong(tagdata) obj.dataPos = @fin.pos obj.data = fin_read_n(unit*count) ensure @fin.pos = curpos end else obj.dataPos = @fin.pos - 4 obj.data = tagdata end obj.processData yield obj } end |