public static void WriteToStream(Tag value, StreamAccessor accessor, out System.Action <long> SetSize)
{
long pos_size;
Stream stream = new MemoryStream();
StreamAccessor accessor2 = new StreamAccessor(stream);
StreamAccessor accessor3 = null;
long start = 0L;
if (value.has_ext)
{
value.WriteExtHeader(accessor2, out accessor3);
start = stream.Position;
}
foreach (Frame frame in value.frames.Values)
{
accessor2.WriteAs <Frame>(frame);
}
if (value.has_ext)
{
long length = stream.Position - start;
accessor3.Write(ID3Utils.CalculateCRC32(stream, start, length), EncodingType.U4BE);
accessor3.Stream.Close();
}
bool unsync = ID3Utils.ID3RequiredUnsync(stream);
if (unsync)
{
Stream stream2 = ID3Utils.ID3Unsynchronize(stream);
stream.Close();
stream = stream2;
}
value.WriteTagHeader(accessor, unsync, out pos_size);
SetSize = delegate(long size){
if (size > StreamAccessor.MaxUInt28)
{
throw new System.ArgumentOutOfRangeException("Tag の情報量が多すぎて保存できません。Tag の内容は 256MB より小さくなる様にして下さい");
}
accessor.PushPosition(pos_size);
accessor.Write((uint)size, EncodingType.UInt28BE);
accessor.PopPosition();
};
accessor.WriteStream(stream);
}
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);
}
}
