/// <summary>Adds <paramref name="filter"/> to the list of filters attached to <paramref name="stream"/>.</summary>
/// <param name="stream">The target stream.</param>
/// <param name="filter">The filter name.</param>
/// <param name="read_write">Combination of the <see cref="FilterChainOptions"/> flags.</param>
/// <param name="parameters">Additional parameters for a user filter.</param>
public static bool stream_filter_prepend(PhpResource stream, string filter, FilterChainOptions read_write, PhpValue parameters)
{
var s = PhpStream.GetValid(stream);
if (s == null)
{
return(false);
}
var where = (FilterChainOptions)read_write & FilterChainOptions.ReadWrite;
return(PhpFilter.AddToStream(s, filter, where | FilterChainOptions.Head, parameters));
}
public static PhpResource stream_filter_prepend(Context ctx, PhpResource stream, string filter, FilterChainOptions read_write = FilterChainOptions.ReadWrite, PhpValue parameters = default)
{
var s = PhpStream.GetValid(stream);
if (s == null) return null; // false;
var where = read_write & FilterChainOptions.ReadWrite;
var added = PhpFilter.AddToStream(ctx, s, filter, where | FilterChainOptions.Head, parameters);
//
if (added.readFilter != null || added.writeFilter != null)
{
return new StreamFilterResource(s, added.writeFilter, added.readFilter);
}
else
{
return null; // false
}
}
