ext/http11: modify the C Ragel parser to upper-snake-case headers in-place

This is based on Zed's suggestion and helps take complexity out
of the hand-written C code, allowing memcpy() to be used instead.

Zed Shaw wrote in <20080303044659.5a550c19.zedshaw@zedshaw.com>:
> * Also, now that I think about it, if you don't care that the original
> string is modified in place then you can just have ragel do all of this
> as it goes.  Simply modify the parser to have it do this transform on
> the header chars using the existing pointer.  That'd probably be
> alright since people don't usually keep the input headers around when
> using the mongrel parser.

I don't have a working Java runtime, so I've only made the bare
minimum modification to the http11_parser.java.rl file which
allows Ragel to still work with it.  All the other Java parts
are untouched and whatever upper-casing routine was used before
continues to be used now.


git-svn-id: svn+ssh://rubyforge.org/var/svn/mongrel/trunk@990 19e92222-5c0b-0410-8929-a290d50e31e9

1 files changed, 13 insertions, 0 deletions

diff --git a/ext/http11/http11_parser.rl b/ext/http11/http11_parser.rl
index fffe57a..a418605 100644
--- a/ext/http11/http11_parser.rl
+++ b/ext/http11/http11_parser.rl
@@ -9,6 +9,18 @@
 #include <ctype.h>
 #include <string.h>
 
+/*
+ * capitalizes all lower-case ASCII characters,
+ * converts dashes to underscores.
+ */
+static void snake_upcase_char(char *c)
+{
+    if (*c >= 'a' && *c <= 'z')
+      *c &= ~0x20;
+    else if (*c == '-')
+      *c = '_';
+}
+
 #define LEN(AT, FPC) (FPC - buffer - parser->AT)
 #define MARK(M,FPC) (parser->M = (FPC) - buffer)
 #define PTR_TO(F) (buffer + parser->F)
@@ -23,6 +35,7 @@
 
 
   action start_field { MARK(field_start, fpc); }
+  action snake_upcase_field { snake_upcase_char((char *)fpc); }
   action write_field { 
     parser->field_len = LEN(field_start, fpc);
   }