private static void WriteContent(Stream fs, AssHeader header, Stream oldFileStream, Dictionary <string, string> fileRefs, List <AssParseInfo> piList)
{
var index = fs.Position;
var endIndex = 0L;
if (header.startPos == 0 && header.endPos == 0)
{
if (!fileRefs.ContainsKey(header.fileName) || !File.Exists(fileRefs[header.fileName]))
{
throw new ArgumentException("cannot find a source file to be archived, filename:" + header.fileName);
}
var filePath = fileRefs[header.fileName];
try
{
using (var f = File.OpenRead(filePath))
{
endIndex = WriteToStream(f, fs);
}
}
catch (Exception e)
{
throw new IOException("cannot read:" + filePath, e);
}
}
else if (header.startPos < header.endPos)
{
throw new InvalidOperationException("AssHeader start position is greater than end position");
}
else if (oldFileStream.Length < header.endPos)
{
throw new ArgumentOutOfRangeException("endPos", "AssHeader end position is out range from the old file stream");
}
else if (!oldFileStream.CanSeek || !oldFileStream.CanRead)
{
throw new IOException("cant read or seek the olfFileStream");
}
else
{
oldFileStream.Position = header.startPos;
var len = header.endPos - header.startPos;
endIndex = WriteToStream(oldFileStream, fs, len);
}
if (endIndex > index)
{
var pi = piList.First(_ => _.fileName == header.fileName);
WriteBackPosition(fs, pi, index, endIndex);
}
else
{
throw new IOException("start index is greater than end index");
}
}
private static AssParseInfo WriteHeader(Stream stream, AssHeader header)
{
stream.Write(header.fileName);
var pi = new AssParseInfo
{
fileName = header.fileName,
posIndex = stream.Position,
};
stream.Write(0L);
stream.Write(0L);
return(pi);
}
public void AddFile(string targetPath, string actualFilePath)
{
if (_headers.Any(_ => _.fileName == targetPath))
{
throw new IOException("target file path already exists:" + targetPath);
}
if (!File.Exists(actualFilePath))
{
throw new IOException("file not found:" + actualFilePath);
}
var s = new AssHeader
{
fileName = targetPath
};
_headers.Add(s);
_fileReference.Add(targetPath, actualFilePath);
}