Changeset 583 for pjproject/trunk/pjlib-util/src/pjlib-util/scanner.c

Timestamp:

Jul 3, 2006 10:08:47 PM (18 years ago)

Author:

bennylp

Message:

Various performance improvements in PJSIP: (1) optimizing for common case to minimize stricmp() calls (header names, method, URI schemes), (2) added functionality in scanner to parse and unescape in-place, (3) etc..

File:

• pjproject/trunk/pjlib-util/src/pjlib-util/scanner.c (modified) (2 diffs)

pjproject/trunk/pjlib-util/src/pjlib-util/scanner.c

@@ -18 +18 @@
  */
 #include <pjlib-util/scanner.h>
+#include <pj/ctype.h>
 #include <pj/string.h>
 #include <pj/except.h>
@@ -283 +284 @@
 
 
+PJ_DEF(void) pj_scan_get_unescape( pj_scanner *scanner,
+                                   const pj_cis_t *spec, pj_str_t *out)
+{
+    register char *s = scanner->curptr;
+    char *dst = s;
+
+    pj_assert(pj_cis_match(spec,0)==0);
+
+    /* Must not match character '%' */
+    pj_assert(pj_cis_match(spec,'%')==0);
+
+    /* EOF is detected implicitly */
+    if (!pj_cis_match(spec, *s) && *s != '%') {
+        pj_scan_syntax_err(scanner);
+        return;
+    }
+
+    out->ptr = s;
+    do {
+        if (*s == '%') {
+            if (s+3 <= scanner->end) {
+                /* This doesn't check if the hex digits are valid.
+                 * If they dont' it will produce garbage characters, but
+                 * no harm is done to the application (e.g. no illegal
+                 * memory access.
+                 */
+                *dst = (pj_uint8_t) ((pj_hex_digit_to_val(*(s+1)) << 4) +
+                                      pj_hex_digit_to_val(*(s+2)));
+                ++dst;
+                s += 3;
+            } else {
+                *dst++ = *s++;
+                *dst++ = *s++;
+                break;
+            }
+        }
+        
+        if (pj_cis_match(spec, *s)) {
+            char *start = s;
+            do {
+                ++s;
+            } while (pj_cis_match(spec, *s));
+
+            if (dst != start) pj_memmove(dst, start, s-start);
+            dst += (s-start);
+        } 
+        
+    } while (*s == '%');
+
+    scanner->curptr = s;
+    out->slen = (dst - out->ptr);
+
+    if (PJ_SCAN_IS_PROBABLY_SPACE(*s) && scanner->skip_ws) {
+        pj_scan_skip_whitespace(scanner);    
+    }
+}
+
+
 PJ_DEF(void) pj_scan_get_quote( pj_scanner *scanner,
                                  int begin_quote, int end_quote,