/// <summary>
/// MPエントリの読み出し
/// </summary>
/// <param name="buffer"></param>
/// <param name="offsetStart">オフセット基準位置</param>
/// <param name="index"></param>
/// <param name="endian"></param>
/// <returns></returns>
private MPEntryValue[] DecodeMPEntries(byte[] buffer, int offsetStart, MPIndexIFD index, Endian endian)
{
int offset = offsetStart + (int)index.MPEntry.OffsetUInt32;
MPEntryValue[] mpEntries = new MPEntryValue[index.NumberOfImages.OffsetUInt32];
for (int i = 0; i < mpEntries.Length; i++)
{
mpEntries[i] = new MPEntryValue(buffer, offset + (16 * i), endian);
}
return(mpEntries);
}
/// <summary>
/// 個別画像ユニークIDリストの読み出し
/// </summary>
/// <param name="buffer"></param>
/// <param name="offsetStart">オフセット基準位置</param>
/// <param name="index"></param>
/// <param name="endian"></param>
/// <returns></returns>
private UniqueID[] DecodeUniqueIDs(byte[] buffer, int offsetStart, MPIndexIFD index, Endian endian)
{
UniqueID[] uids = null;
if (index.ImageUIDList != null)
{
uids = new UniqueID[index.NumberOfImages.OffsetUInt32];
int offset = offsetStart + (int)index.ImageUIDList.OffsetUInt32;
for (int i = 0; i < uids.Length; i++)
{
uids[0] = new UniqueID(buffer, offset + (33 * i), endian);
}
}
return(uids);
}
/// <summary>
/// MPインデックスIFDの読み出し
/// </summary>
/// <param name="buffer"></param>
/// <param name="o">オフセット</param>
/// <param name="endian"></param>
/// <returns></returns>
private MPIndexIFD DecodeMPIndexIFD(byte[] buffer, int o, int offsetStart, Endian endian)
{
// バイト列から読み込み
MPIndexIFD index = new MPIndexIFD
{
Count = BitConverterEx.ToUInt16(buffer, o, endian),
MPFVersion = new IFD(buffer, o + 2, offsetStart, endian),
NumberOfImages = new IFD(buffer, o + 14, offsetStart, endian),
MPEntry = new IFD(buffer, o + 26, offsetStart, endian),
};
// タグ番号をチェック
if (index.MPFVersion.Tag != 45056)
{
throw new Exception("MPFVersionのデコードに失敗しました");
}
if (index.NumberOfImages.Tag != 45057)
{
throw new Exception("NumberOfImagesのデコードに失敗しました");
}
if (index.MPEntry.Tag != 45058)
{
throw new Exception("MPEntryのデコードに失敗しました");
}
// 個別画像ユニークIDリスト以下は省略されて存在しないかもしれない
if (index.Count > 3)
{
index.ImageUIDList = new IFD(buffer, o + 38, offsetStart, endian);
index.TotalFrames = new IFD(this.buffer, o + 50, offsetStart, endian);
index.NextIFDOffset = BitConverterEx.ToUInt32(buffer, o + 62, endian);
}
else if (index.Count == 3)
{
index.ImageUIDList = null;
index.TotalFrames = null;
index.NextIFDOffset = BitConverterEx.ToUInt32(buffer, o + 38, endian);
}
else
{
throw new InvalidOperationException("MPインデックスIFDの解析に失敗しました");
}
return(index);
}
