From 2adf4fb28af99dd72c6b2fc816bcc11e5dde1ffc Mon Sep 17 00:00:00 2001
From: erdgeist <>
Date: Fri, 8 Dec 2006 19:20:51 +0000
Subject: Our scanner routine for the URI query string

---
 scan_urlencoded_query.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 scan_urlencoded_query.c

(limited to 'scan_urlencoded_query.c')

diff --git a/scan_urlencoded_query.c b/scan_urlencoded_query.c
new file mode 100644
index 0000000..7aeabab
--- /dev/null
+++ b/scan_urlencoded_query.c
@@ -0,0 +1,57 @@
+#include "scan.h"
+
+#define BREAK_AT_QUESTIONMARK (1<<0)
+#define BREAK_AT_WHITESPACE   (1<<1)
+#define BREAK_AT_AMPERSAND    (1<<2)
+#define BREAK_AT_EQUALSIGN    (1<<3)
+
+#define SCAN_PATH             ( BREAK_AT_QUESTIONMARK | BREAK_AT_WHITESPACE )
+#define SCAN_SEARCHPATH_PARAM ( BREAK_AT_EQUALSIGN )
+#define SCAN_SEARCHPATH_VALUE ( BREAK_AT_AMPERSAND | BREAK_AT_WHITESPACE )
+
+// Idea is to do a in place replacement or guarantee at least
+// strlen( string ) bytes in deststring
+// watch http://www.ietf.org/rfc/rfc2396.txt
+//       unreserved    = alphanum | mark
+//       mark          = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
+// we add '%' to the matrix to not stop at encoded chars.
+
+static const unsigned char reserved_matrix[] = { 0xA2, 0x63, 0xFF, 0x03, 0xFE, 0xFF, 0xFF, 0x87, 0xFE, 0xFF, 0xFF, 0x47};
+inline int is_unreserved( unsigned char c ) const {
+  if( ( c <= 32 ) || ( c >= 127 ) ) return 0; return 1&(reserved_matrix[(c-32)>>3]>>(c&7));
+}
+
+size_t scan_urlencoded_query(char **string, char *deststring, int flags) {
+  register const unsigned char* s=*(const unsigned char*) string;
+  const unsigned char *d = deststring;
+  register unsigned char b, c;
+
+  while ( is_unreserved( c = *s++) ) {
+    if (c=='%') {
+      if( ( c = scan_fromhex(*s++) ) < 0 ) return -1;
+      if( ( b = scan_fromhex(*s++) ) < 0 ) return -1;
+      c=(c<<4)|b;
+    }
+    *d++ = c;
+  }
+
+  switch( c ) {
+  case 0: case '\r': case '\n': case ' ':
+    if ( flags & BREAK_AT_WHITESPACE == 0 ) return -1;
+    break;
+  case '?':
+    if ( flags & BREAK_AT_QUESTIONMARK == 0 ) return -1;
+    break;
+  case '=':
+    if ( flags & BREAK_AT_EQUALSIGN == 0 ) return -1;
+    break;
+  case '&':
+    if ( flags & BREAK_AT_AMPERSAND == 0 ) return -1;
+    break;
+  default:
+    return -1;
+  }
+
+  *string = s;
+  return d - deststring;
+}
-- 
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