public static Tag ReadFromStream(StreamAccessor accessor, out int tagsize)
{
Tag tag = new Tag();
bool unsync;
int size;
try{
size = tag.ReadTagHeader(accessor, out unsync);
tagsize = size + 10;
}catch (System.Exception e) {
__dll__.log.WriteError(e, "TagHeader の読込に失敗しました。");
tagsize = 0;
return(null);
}
System.IO.Stream str = accessor.ReadSubStream((long)size);
StreamAccessor acc_str;
if (unsync)
{
System.IO.Stream stream = ID3Utils.ID3ResolveUnsync(str);
str.Close();
acc_str = new StreamAccessor(stream);
}
else
{
acc_str = new StreamAccessor(str);
}
if (tag.has_ext)
{
uint crc32;
int padding;
try{
tag.ReadExtHeader(acc_str, out crc32, out padding);
}catch (Exception exception2) {
exception = exception2;
__dll__.log.WriteError(exception, "ExtendedHeader の読込に失敗しました。");
return(null);
}
if (tag.hascrc)
{
long crc_start = acc_str.Stream.Position;
long crc_len = (acc_str.Stream.Length - crc_start) - padding;
if (crc_len < 0L)
{
__dll__.log.WriteError(string.Format("Extended Header-Padding Size の値が不正です。大きすぎます:{0}", padding));
return(null);
}
if (crc32 != ID3Utils.CalculateCRC32(acc_str.Stream, crc_start, crc_len))
{
__dll__.log.WriteError("ファイルの CRC32 値が一致しませんでした。");
return(null);
}
}
}
tag.frames = new afh.Collections.DictionaryP <string, Frame>();
while (true)
{
Frame val = acc_str.Read <Frame>(EncodingType.NoSpecified);
if (val == Frame.EndOfFrames)
{
acc_str.Stream.Close();
return(tag);
}
tag.frames.Add(val.FrameId, val);
}
}
