public int SaveToStream(BinaryWriter bw)
{
// 将数据保存为未压缩格式
long offset = bw.BaseStream.Position;
header.SetToUncompressFormat();
if (chunkMetas != null) // framecapture section
{
//生成临时数据，以跳过被remove的chunk
using (MemoryStream msTmp = new MemoryStream(uncompressedData.Length + 64))
using (BinaryWriter bwTmp = new BinaryWriter(msTmp))
{
foreach (var meta in chunkMetas)
{
if (meta.isRemoved)
{
continue;
}
bwTmp.AlignUp(64);
bwTmp.Write(uncompressedData, (int)meta.offset, (int)meta.fullLength);
bwTmp.AlignUp(64);
}
header.sectionUncompressedLength = (ulong)msTmp.Position; // Position 有可能比 Length 大。。。。
header.sectionCompressedLength = header.sectionUncompressedLength;
header.SaveToStream(bw);
bw.Write(msTmp.GetBuffer(), 0, (int)msTmp.Position);
}
}
else if (thumbPixels != null) // thumbnail section
{
header.sectionCompressedLength = (ulong)(ExtThumbnailHeader.headerSize + thumbPixels.Length);
header.sectionCompressedLength = header.sectionUncompressedLength;
header.SaveToStream(bw);
thumbHeader.SaveToStream(bw);
bw.Write(thumbPixels, 0, thumbPixels.Length);
}
else
{
header.SaveToStream(bw);
bw.Write(uncompressedData, 0, uncompressedData.Length);
}
return((int)(bw.BaseStream.Position - offset));
}