U:RDoc::AnyMethod[iI"set_encoding_by_bom:ETI"IO#set_encoding_by_bom;TF:publico:RDoc::Markup::Document:@parts[o:RDoc::Markup::Paragraph;	[	I"FChecks if +ios+ starts with a BOM, and then consumes it and sets ;TI"Fthe external encoding.  Returns the result encoding if found, or ;TI"@nil.  If +ios+ is not binmode or its encoding has been set ;TI"*already, an exception will be raised.;To:RDoc::Markup::BlankLineo:RDoc::Markup::Verbatim;	[I"*File.write("bom.txt", "\u{FEFF}abc")
;TI"&ios = File.open("bom.txt", "rb")
;TI"7ios.set_encoding_by_bom    #=>  #<Encoding:UTF-8>
;TI"
;TI"$File.write("nobom.txt", "abc")
;TI"(ios = File.open("nobom.txt", "rb")
;TI"(ios.set_encoding_by_bom    #=>  nil;T:@format0:
@fileI"	io.c;T:0@omit_headings_from_table_of_contents_below0I"2ios.set_encoding_by_bom   -> encoding or nil
;T0[I"();T@FI"IO;TcRDoc::NormalClass00