public static Result FromSpan(out FsPath fsPath, ReadOnlySpan <byte> path)
{
UnsafeHelpers.SkipParamInit(out fsPath);
// Ensure null terminator even if the creation fails for safety
fsPath.Str[MaxLength] = 0;
var sb = new U8StringBuilder(fsPath.Str);
bool overflowed = sb.Append(path).Overflowed;
return(overflowed ? ResultFs.TooLongPath.Log() : Result.Success);
}
public static Result CopyFile(IFileSystem destFs, IFileSystem sourceFs, ReadOnlySpan <byte> destParentPath,
ReadOnlySpan <byte> sourcePath, ref DirectoryEntry dirEntry, Span <byte> copyBuffer)
{
IFile srcFile = null;
IFile dstFile = null;
try
{
Result rc = sourceFs.OpenFile(out srcFile, new U8Span(sourcePath), OpenMode.Read);
if (rc.IsFailure())
{
return(rc);
}
FsPath dstPath = default;
int dstPathLen = StringUtils.Concat(dstPath.Str, destParentPath);
dstPathLen = StringUtils.Concat(dstPath.Str, dirEntry.Name, dstPathLen);
if (dstPathLen > FsPath.MaxLength)
{
throw new ArgumentException();
}
rc = destFs.CreateFile(dstPath, dirEntry.Size, CreateFileOptions.None);
if (rc.IsFailure())
{
return(rc);
}
rc = destFs.OpenFile(out dstFile, dstPath, OpenMode.Write);
if (rc.IsFailure())
{
return(rc);
}
long fileSize = dirEntry.Size;
long offset = 0;
while (offset < fileSize)
{
rc = srcFile.Read(out long bytesRead, offset, copyBuffer, ReadOption.None);
if (rc.IsFailure())
{
return(rc);
}
rc = dstFile.Write(offset, copyBuffer.Slice(0, (int)bytesRead), WriteOption.None);
if (rc.IsFailure())
{
return(rc);
}
offset += bytesRead;
}
return(Result.Success);
}
finally
{
srcFile?.Dispose();
dstFile?.Dispose();
}
}