public async Task<ImageInfo[]> LoadFromDbAsync(string dbFileName)
{
var file = await FileSystem.Current.GetFileFromPathAsync(dbFileName).ConfigureAwait(false);
if (file == null)
throw new FileNotFoundException();
using (var fs = await file.OpenAsync(FileAccess.Read).ConfigureAwait(false))
using (var gz = new GZipStream(fs, CompressionMode.Decompress))
using (var br = new BinaryReader(gz))
{
long count = br.ReadInt32();
_info = new ImageInfo[count];
for (var i = 0; i < count; i++)
{
var hash = br.ReadUInt64();
var titleId = br.ReadUInt16();
var episodeId = br.ReadUInt16();
var frame = br.ReadUInt32();
_info[i] = new ImageInfo
{
Hash = hash,
TitleId = titleId,
EpisodeId = episodeId,
Frame = frame
};
}
}
return _info;
}
/// <summary>
/// 該当する画像ベクトルを持つ画像の情報を返します
/// </summary>
/// <param name="vector">画像ベクトル</param>
/// <returns>同じ画像ベクトルを持つ画像群</returns>
public ImageInfo[] GetImageInfo(ulong vector)
{
int min = 0;
int max = _info.Length - 1;
int mid;
int p = 0;
bool found = false;
while (min <= max)
{
mid = min + (max - min) / 2;
if (_info[mid].Hash == vector)
{
p = mid;
found = true;
break;
}
else if (_info[mid].Hash < vector)
{
min = mid + 1;
}
else if (_info[mid].Hash > vector)
{
max = mid - 1;
}
}
// 見つからなければ空の配列を返す
if (!found)
{
return new ImageInfo[] { };
}
// 見つかったら同じvectorを持つ画像情報をすべて返す
// (_info内は Hash をキーにしてソート済み)
min = max = p;
while (min >= 0 && _info[min].Hash == vector)
{
min--;
}
while (max < _info.Length && _info[max].Hash == vector)
{
max++;
}
ImageInfo[] result = new ImageInfo[max - min - 1];
for (int i = min + 1; i < max; i++)
{
result[i - min - 1] = _info[i];
}
return result;
}
public ImageSearch(ImageInfo[] info)
{
_info = info;
}
protected ImageSearch(ImageInfo[] info)
{
_info = info;
}
public ImageInfo[] LoadFromDb(string dbFileName)
{
using (FileStream fs = new FileStream(dbFileName, FileMode.Open, FileAccess.Read))
{
using (GZipStream gz = new GZipStream(fs, CompressionMode.Decompress))
{
using (BinaryReader br = new BinaryReader(gz))
{
long count = br.ReadInt32();
_info = new ImageInfo[count];
for (int i = 0; i < count; i++)
{
ulong hash = br.ReadUInt64();
UInt16 titleId = br.ReadUInt16();
UInt16 episodeId = br.ReadUInt16();
UInt32 frame = br.ReadUInt32();
_info[i] = new ImageInfo
{
Hash = hash,
TitleId = titleId,
EpisodeId = episodeId,
Frame = frame
};
}
}
}
}
return _info;
}
