opkg: apply "1-pkg-parse--Optimize-inefficient-parsing.patch" from OpenEmbedded

  pkg_parse: Optimize inefficient parsing.  Instead of expensively probing all
  fields in row, dispatch based on the first letter of the field. Tests show ~12
  times reduction in number of calls to low-level parsing functions.

git-svn-id: http://opkg.googlecode.com/svn/trunk@17 e8e0d7a0-c8d9-11dd-a880-a1081c7ac358

diff --git a/pkg_parse.c b/pkg_parse.c
index 3e6d8b4833f6211b74b869947855c82a21c85557..da245ccbeff24ce1f8bec76ee4c2d06a705e78f1 100644 (file)
--- a/pkg_parse.c
+++ b/pkg_parse.c
@@ -241,87 +241,116 @@ int pkg_parse_raw(pkg_t *pkg, char ***raw, pkg_src_t *src, pkg_dest_t *dest)
 
     for (lines = *raw; *lines; lines++) {
        /*      fprintf(stderr, "PARSING %s\n", *lines);*/
-       if(isGenericFieldType("Package:", *lines)) 
-           pkg->name = parseGenericFieldType("Package", *lines);
-       else if(isGenericFieldType("Architecture:", *lines))
-           pkg->architecture = parseGenericFieldType("Architecture", *lines);
-       else if(isGenericFieldType("Filename:", *lines))
-           pkg->filename = parseGenericFieldType("Filename", *lines);
-       else if(isGenericFieldType("Section:", *lines))
-           pkg->section = parseGenericFieldType("Section", *lines);
-       else if(isGenericFieldType("MD5sum:", *lines))
-           pkg->md5sum = parseGenericFieldType("MD5sum", *lines);
-       /* The old opkg wrote out status files with the wrong case for MD5sum,
-          let's parse it either way */
-       else if(isGenericFieldType("MD5Sum:", *lines))
-           pkg->md5sum = parseGenericFieldType("MD5Sum", *lines);
-       else if(isGenericFieldType("Size:", *lines))
-           pkg->size = parseGenericFieldType("Size", *lines);
-       else if(isGenericFieldType("Source:", *lines))
-           pkg->source = parseGenericFieldType("Source", *lines);
-       else if(isGenericFieldType("Installed-Size:", *lines))
-           pkg->installed_size = parseGenericFieldType("Installed-Size", *lines);
-       else if(isGenericFieldType("Installed-Time:", *lines)) {
-            char *time_str = parseGenericFieldType("Installed-Time", *lines);
-            pkg->installed_time = strtoul(time_str, NULL, 0);
-       } else if(isGenericFieldType("Priority:", *lines))
-           pkg->priority = parseGenericFieldType("Priority", *lines);
-       else if(isGenericFieldType("Essential:", *lines)) {
-           char *essential_value;
-           essential_value = parseGenericFieldType("Essential", *lines);
-           if (strcmp(essential_value, "yes") == 0) {
-               pkg->essential = 1;
-           }
-           free(essential_value);
-       }
-       else if(isGenericFieldType("Status", *lines))
-           parseStatus(pkg, *lines);
-       else if(isGenericFieldType("Version", *lines))
-           parseVersion(pkg, *lines);
-       else if(isGenericFieldType("Maintainer", *lines))
-           pkg->maintainer = parseGenericFieldType("Maintainer", *lines);
-       else if(isGenericFieldType("Conffiles", *lines)){
-           parseConffiles(pkg, *lines);
-           reading_conffiles = 1;
-       }
-       else if(isGenericFieldType("Description", *lines)) {
-           pkg->description = parseGenericFieldType("Description", *lines);
-           reading_conffiles = 0;
-           reading_description = 1;
-       }
-
-       else if(isGenericFieldType("Provides", *lines)){
+       switch (**lines) {
+       case 'P':
+           if(isGenericFieldType("Package:", *lines)) 
+               pkg->name = parseGenericFieldType("Package", *lines);
+           else if(isGenericFieldType("Priority:", *lines))
+               pkg->priority = parseGenericFieldType("Priority", *lines);
+           else if(isGenericFieldType("Provides", *lines)){
 /* Here we add the internal_use to align the off by one problem between provides_str and provides */
-            provide = (char * ) malloc(strlen(*lines)+ 35 ); /* Preparing the space for the new opkg_internal_use_only */
-            if ( alterProvidesLine(*lines,provide) ){
-               return EINVAL;
-            }
-           pkg->provides_str = parseDependsString( provide, &pkg->provides_count);
+               provide = (char * ) malloc(strlen(*lines)+ 35 ); /* Preparing the space for the new opkg_internal_use_only */
+               if ( alterProvidesLine(*lines,provide) ){
+                   return EINVAL;
+               }
+               pkg->provides_str = parseDependsString( provide, &pkg->provides_count);
 /* Let's try to hack a bit here.
    The idea is that if a package has no Provides, we would add one generic, to permit the check of dependencies
    in alot of other places. We will remove it before writing down the status database */
-            pkg_false_provides=0;
-            free(provide);
-        } 
-
-       else if(isGenericFieldType("Depends", *lines))
-           pkg->depends_str = parseDependsString(*lines, &pkg->depends_count);
-       else if(isGenericFieldType("Pre-Depends", *lines))
-           pkg->pre_depends_str = parseDependsString(*lines, &pkg->pre_depends_count);
-       else if(isGenericFieldType("Recommends", *lines))
-           pkg->recommends_str = parseDependsString(*lines, &pkg->recommends_count);
-       else if(isGenericFieldType("Suggests", *lines))
-           pkg->suggests_str = parseDependsString(*lines, &pkg->suggests_count);
-       /* Abhaya: support for conflicts */
-       else if(isGenericFieldType("Conflicts", *lines))
-           pkg->conflicts_str = parseDependsString(*lines, &pkg->conflicts_count);
-       else if(isGenericFieldType("Replaces", *lines))
-           pkg->replaces_str = parseDependsString(*lines, &pkg->replaces_count);
-       else if(line_is_blank(*lines)) {
-           lines++;
+               pkg_false_provides=0;
+               free(provide);
+           } 
+           else if(isGenericFieldType("Pre-Depends", *lines))
+               pkg->pre_depends_str = parseDependsString(*lines, &pkg->pre_depends_count);
            break;
-       }
-       else if(**lines == ' '){
+
+       case 'A':
+           if(isGenericFieldType("Architecture:", *lines))
+               pkg->architecture = parseGenericFieldType("Architecture", *lines);
+           break;
+
+       case 'F':
+           if(isGenericFieldType("Filename:", *lines))
+               pkg->filename = parseGenericFieldType("Filename", *lines);
+           break;
+
+       case 'S':
+           if(isGenericFieldType("Section:", *lines))
+               pkg->section = parseGenericFieldType("Section", *lines);
+           else if(isGenericFieldType("Size:", *lines))
+               pkg->size = parseGenericFieldType("Size", *lines);
+           else if(isGenericFieldType("Source:", *lines))
+               pkg->source = parseGenericFieldType("Source", *lines);
+           else if(isGenericFieldType("Status", *lines))
+               parseStatus(pkg, *lines);
+           else if(isGenericFieldType("Suggests", *lines))
+               pkg->suggests_str = parseDependsString(*lines, &pkg->suggests_count);
+           break;
+
+       case 'M':
+           if(isGenericFieldType("MD5sum:", *lines))
+               pkg->md5sum = parseGenericFieldType("MD5sum", *lines);
+           /* The old opkg wrote out status files with the wrong case for MD5sum,
+               let's parse it either way */
+           else if(isGenericFieldType("MD5Sum:", *lines))
+               pkg->md5sum = parseGenericFieldType("MD5Sum", *lines);
+           else if(isGenericFieldType("Maintainer", *lines))
+               pkg->maintainer = parseGenericFieldType("Maintainer", *lines);
+           break;
+
+       case 'I':
+           if(isGenericFieldType("Installed-Size:", *lines))
+               pkg->installed_size = parseGenericFieldType("Installed-Size", *lines);
+           else if(isGenericFieldType("Installed-Time:", *lines)) {
+               char *time_str = parseGenericFieldType("Installed-Time", *lines);
+               pkg->installed_time = strtoul(time_str, NULL, 0);
+           }       
+           break;
+
+       case 'E':
+           if(isGenericFieldType("Essential:", *lines)) {
+               char *essential_value;
+               essential_value = parseGenericFieldType("Essential", *lines);
+               if (strcmp(essential_value, "yes") == 0) {
+                   pkg->essential = 1;
+               }
+               free(essential_value);
+           }
+           break;
+
+       case 'V':
+           if(isGenericFieldType("Version", *lines))
+               parseVersion(pkg, *lines);
+           break;
+
+       case 'C':
+           if(isGenericFieldType("Conffiles", *lines)){
+               parseConffiles(pkg, *lines);
+               reading_conffiles = 1;
+           }
+           else if(isGenericFieldType("Conflicts", *lines))
+               pkg->conflicts_str = parseDependsString(*lines, &pkg->conflicts_count);
+           break;
+
+       case 'D':
+           if(isGenericFieldType("Description", *lines)) {
+               pkg->description = parseGenericFieldType("Description", *lines);
+               reading_conffiles = 0;
+               reading_description = 1;
+           }
+           else if(isGenericFieldType("Depends", *lines))
+               pkg->depends_str = parseDependsString(*lines, &pkg->depends_count);
+           break;
+
+       case 'R':
+           if(isGenericFieldType("Recommends", *lines))
+               pkg->recommends_str = parseDependsString(*lines, &pkg->recommends_count);
+           else if(isGenericFieldType("Replaces", *lines))
+               pkg->replaces_str = parseDependsString(*lines, &pkg->replaces_count);
+           
+           break;
+
+       case ' ':
            if(reading_description) {
                /* we already know it's not blank, so the rest of description */      
                pkg->description = realloc(pkg->description,
@@ -332,8 +361,18 @@ int pkg_parse_raw(pkg_t *pkg, char ***raw, pkg_src_t *src, pkg_dest_t *dest)
            }
            else if(reading_conffiles)
                parseConffiles(pkg, *lines);
+               
+           break;
+
+       default:
+           if(line_is_blank(*lines)) {
+               lines++;
+               goto out;
+           }
        }
     }
+out:;
+    
     *raw = lines;
 /* If the ipk has not a Provides line, we insert our false line */ 
     if ( pkg_false_provides==1)