Move a few binary string handling functions to cowboy_bstr

src/cowboy_bstr.erl

@@ -0,0 +1,86 @@
+%% Copyright (c) 2011, Loïc Hoguin <essen@dev-extend.eu>
+%%
+%% Permission to use, copy, modify, and/or distribute this software for any
+%% purpose with or without fee is hereby granted, provided that the above
+%% copyright notice and this permission notice appear in all copies.
+%%
+%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+%% @doc Binary string manipulation.
+-module(cowboy_bstr).
+
+-export([to_lower/1]). %% Binary strings.
+-export([char_to_lower/1, char_to_upper/1]). %% Characters.
+
+%% @doc Convert a binary string to lowercase.
+-spec to_lower(binary()) -> binary().
+to_lower(L) ->
+	<< << (char_to_lower(C)) >> || << C >> <= L >>.
+
+%% @doc Convert [A-Z] characters to lowercase.
+%% @end
+%% We gain noticeable speed by matching each value directly.
+-spec char_to_lower(char()) -> char().
+char_to_lower($A) -> $a;
+char_to_lower($B) -> $b;
+char_to_lower($C) -> $c;
+char_to_lower($D) -> $d;
+char_to_lower($E) -> $e;
+char_to_lower($F) -> $f;
+char_to_lower($G) -> $g;
+char_to_lower($H) -> $h;
+char_to_lower($I) -> $i;
+char_to_lower($J) -> $j;
+char_to_lower($K) -> $k;
+char_to_lower($L) -> $l;
+char_to_lower($M) -> $m;
+char_to_lower($N) -> $n;
+char_to_lower($O) -> $o;
+char_to_lower($P) -> $p;
+char_to_lower($Q) -> $q;
+char_to_lower($R) -> $r;
+char_to_lower($S) -> $s;
+char_to_lower($T) -> $t;
+char_to_lower($U) -> $u;
+char_to_lower($V) -> $v;
+char_to_lower($W) -> $w;
+char_to_lower($X) -> $x;
+char_to_lower($Y) -> $y;
+char_to_lower($Z) -> $z;
+char_to_lower(Ch) -> Ch.
+
+%% @doc Convert [a-z] characters to uppercase.
+-spec char_to_upper(char()) -> char().
+char_to_upper($a) -> $A;
+char_to_upper($b) -> $B;
+char_to_upper($c) -> $C;
+char_to_upper($d) -> $D;
+char_to_upper($e) -> $E;
+char_to_upper($f) -> $F;
+char_to_upper($g) -> $G;
+char_to_upper($h) -> $H;
+char_to_upper($i) -> $I;
+char_to_upper($j) -> $J;
+char_to_upper($k) -> $K;
+char_to_upper($l) -> $L;
+char_to_upper($m) -> $M;
+char_to_upper($n) -> $N;
+char_to_upper($o) -> $O;
+char_to_upper($p) -> $P;
+char_to_upper($q) -> $Q;
+char_to_upper($r) -> $R;
+char_to_upper($s) -> $S;
+char_to_upper($t) -> $T;
+char_to_upper($u) -> $U;
+char_to_upper($v) -> $V;
+char_to_upper($w) -> $W;
+char_to_upper($x) -> $X;
+char_to_upper($y) -> $Y;
+char_to_upper($z) -> $Z;
+char_to_upper(Ch) -> Ch.

src/cowboy_http_protocol.erl

@@ -141,7 +141,7 @@ wait_header(Req, State=#state{socket=Socket,
 	| http_eoh, #http_req{}, #state{}) -> ok.
 header({http_header, _I, 'Host', _R, RawHost}, Req=#http_req{
 		transport=Transport, host=undefined}, State) ->
-	RawHost2 = binary_to_lower(RawHost),
+	RawHost2 = cowboy_bstr:to_lower(RawHost),
 	case catch cowboy_dispatcher:split_host(RawHost2) of
 		{Host, RawHost3, undefined} ->
 			Port = default_port(Transport:name()),
@@ -311,7 +311,7 @@ connection_to_atom(<<"keep-alive">>) ->
 connection_to_atom(<<"close">>) ->
 	close;
 connection_to_atom(Connection) ->
-	case binary_to_lower(Connection) of
+	case cowboy_bstr:to_lower(Connection) of
 		<<"close">> -> close;
 		_Any -> keepalive
 	end.
@@ -338,73 +338,9 @@ format_header(<<>>, _Any, Acc) ->
 format_header(<< $-, Rest/bits >>, Bool, Acc) ->
 	format_header(Rest, not Bool, << Acc/binary, $- >>);
 format_header(<< C, Rest/bits >>, true, Acc) ->
-	format_header(Rest, false, << Acc/binary, (char_to_upper(C)) >>);
+	format_header(Rest, false, << Acc/binary, (cowboy_bstr:char_to_upper(C)) >>);
 format_header(<< C, Rest/bits >>, false, Acc) ->
-	format_header(Rest, false, << Acc/binary, (char_to_lower(C)) >>).
+	format_header(Rest, false, << Acc/binary, (cowboy_bstr:char_to_lower(C)) >>).
-
-%% We are excluding a few characters on purpose.
--spec binary_to_lower(binary()) -> binary().
-binary_to_lower(L) ->
-	<< << (char_to_lower(C)) >> || << C >> <= L >>.
-
-%% We gain noticeable speed by matching each value directly.
--spec char_to_lower(char()) -> char().
-char_to_lower($A) -> $a;
-char_to_lower($B) -> $b;
-char_to_lower($C) -> $c;
-char_to_lower($D) -> $d;
-char_to_lower($E) -> $e;
-char_to_lower($F) -> $f;
-char_to_lower($G) -> $g;
-char_to_lower($H) -> $h;
-char_to_lower($I) -> $i;
-char_to_lower($J) -> $j;
-char_to_lower($K) -> $k;
-char_to_lower($L) -> $l;
-char_to_lower($M) -> $m;
-char_to_lower($N) -> $n;
-char_to_lower($O) -> $o;
-char_to_lower($P) -> $p;
-char_to_lower($Q) -> $q;
-char_to_lower($R) -> $r;
-char_to_lower($S) -> $s;
-char_to_lower($T) -> $t;
-char_to_lower($U) -> $u;
-char_to_lower($V) -> $v;
-char_to_lower($W) -> $w;
-char_to_lower($X) -> $x;
-char_to_lower($Y) -> $y;
-char_to_lower($Z) -> $z;
-char_to_lower(Ch) -> Ch.
-
--spec char_to_upper(char()) -> char().
-char_to_upper($a) -> $A;
-char_to_upper($b) -> $B;
-char_to_upper($c) -> $C;
-char_to_upper($d) -> $D;
-char_to_upper($e) -> $E;
-char_to_upper($f) -> $F;
-char_to_upper($g) -> $G;
-char_to_upper($h) -> $H;
-char_to_upper($i) -> $I;
-char_to_upper($j) -> $J;
-char_to_upper($k) -> $K;
-char_to_upper($l) -> $L;
-char_to_upper($m) -> $M;
-char_to_upper($n) -> $N;
-char_to_upper($o) -> $O;
-char_to_upper($p) -> $P;
-char_to_upper($q) -> $Q;
-char_to_upper($r) -> $R;
-char_to_upper($s) -> $S;
-char_to_upper($t) -> $T;
-char_to_upper($u) -> $U;
-char_to_upper($v) -> $V;
-char_to_upper($w) -> $W;
-char_to_upper($x) -> $X;
-char_to_upper($y) -> $Y;
-char_to_upper($z) -> $Z;
-char_to_upper(Ch) -> Ch.
 
 %% Tests.