From a9c62f2c39a74ccfc05fa7160efade49286da77c Mon Sep 17 00:00:00 2001
From: William Wilgus <wilgus.william@gmail.com>
Date: Sun, 13 Mar 2022 01:36:52 -0500
Subject: metadata_common.c optimize parse_tag

Change-Id: I84ad404fdcc9698b9d08e6e9c37929f4b7bf569f
---
 lib/rbcodec/metadata/metadata_common.c | 78 ++++++++++++++++++++++------------
 1 file changed, 50 insertions(+), 28 deletions(-)

(limited to 'lib/rbcodec/metadata/metadata_common.c')

diff --git a/lib/rbcodec/metadata/metadata_common.c b/lib/rbcodec/metadata/metadata_common.c
index 6fc50e9a9d..3677599c30 100644
--- a/lib/rbcodec/metadata/metadata_common.c
+++ b/lib/rbcodec/metadata/metadata_common.c
@@ -252,6 +252,22 @@ bool skip_id3v2(int fd, struct mp3entry *id3)
     return success;
 }
 
+static int get_tag_option(const char *option, const char *const oplist[])
+{
+    int i;
+    int ifound = -1;
+    const char *op;
+    for (i=0; (op=oplist[i]) != NULL; i++)
+    {
+        if (strcasecmp(op, option) == 0)
+        {
+            ifound = i;
+            break;
+        }
+    }
+    return ifound;
+}
+
 /* Parse the tag (the name-value pair) and fill id3 and buffer accordingly.
  * String values to keep are written to buf. Returns number of bytes written
  * to buf (including end nil).
@@ -262,19 +278,38 @@ long parse_tag(const char* name, char* value, struct mp3entry* id3,
     long len = 0;
     char** p;
 
-    if ((((strcasecmp(name, "track") == 0) && (type == TAGTYPE_APE)))
-        || ((strcasecmp(name, "tracknumber") == 0) && (type == TAGTYPE_VORBIS)))
+    enum
+    {
+        eTRACK = 0, eTRACKNUMBER, eDISCNUMBER, eDISC,
+        eYEAR, eDATE, eTITLE, eARTIST, eALBUM, eGENRE,
+        eCOMPOSER, eCOMMENT, eALBUMARTIST, eALBUM_ARTIST,
+        eENSEMBLE, eGROUPING, eCONTENTGROUP, eCONTENT_GROUP,
+        eMUSICBRAINZ1, eMUSICBRAINZ2
+    };
+    
+    const char *tagops[] =
+    { "track", "tracknumber", "discnumber", "disc",
+       "year","date","title", "artist", "album", "genre"
+       "composer","comment","albumartist","album artist",
+       "ensemble","grouping","contentgroup","content group",
+       "musicbrainz_trackid", "http://musicbrainz.org", NULL
+    };
+
+    int item = get_tag_option(name, tagops);
+
+    if (((item == eTRACK && (type == TAGTYPE_APE)))
+        || (item == eTRACKNUMBER && (type == TAGTYPE_VORBIS)))
     {
         id3->tracknum = atoi(value);
         p = &(id3->track_string);
     }
-    else if (strcasecmp(name, "discnumber") == 0 || strcasecmp(name, "disc") == 0)
+    else if (item == eDISCNUMBER || item == eDISC)
     {
         id3->discnum = atoi(value);
         p = &(id3->disc_string);
     }
-    else if (((strcasecmp(name, "year") == 0) && (type == TAGTYPE_APE))
-        || ((strcasecmp(name, "date") == 0) && (type == TAGTYPE_VORBIS)))
+    else if ((item == eYEAR && (type == TAGTYPE_APE))
+        || (item == eDATE && (type == TAGTYPE_VORBIS)))
     {
         /* Date's can be in any format in Vorbis. However most of them
          * are in ISO8601 format so if we try and parse the first part
@@ -288,56 +323,43 @@ long parse_tag(const char* name, char* value, struct mp3entry* id3,
         }
         p = &(id3->year_string);
     }
-    else if (strcasecmp(name, "title") == 0)
+    else if (item == eTITLE)
     {
         p = &(id3->title);
     }
-    else if (strcasecmp(name, "artist") == 0)
+    else if (item == eARTIST)
     {
         p = &(id3->artist);
     }
-    else if (strcasecmp(name, "album") == 0)
+    else if (item == eALBUM)
     {
         p = &(id3->album);
     }
-    else if (strcasecmp(name, "genre") == 0)
+    else if (item == eGENRE)
     {
         p = &(id3->genre_string);
     }
-    else if (strcasecmp(name, "composer") == 0)
+    else if (item == eCOMPOSER)
     {
         p = &(id3->composer);
     }
-    else if (strcasecmp(name, "comment") == 0)
+    else if (item == eCOMMENT)
     {
         p = &(id3->comment);
     }
-    else if (strcasecmp(name, "albumartist") == 0)
+    else if (item == eALBUMARTIST || item == eALBUM_ARTIST)
     {
         p = &(id3->albumartist);
     }
-    else if (strcasecmp(name, "album artist") == 0)
+    else if (item == eENSEMBLE)
     {
         p = &(id3->albumartist);
     }
-    else if (strcasecmp(name, "ensemble") == 0)
-    {
-        p = &(id3->albumartist);
-    }
-    else if (strcasecmp(name, "grouping") == 0)
-    {
-        p = &(id3->grouping);
-    }
-    else if (strcasecmp(name, "content group") == 0)
-    {
-        p = &(id3->grouping);
-    }
-    else if (strcasecmp(name, "contentgroup") == 0)
+    else if (item == eGROUPING || item == eCONTENTGROUP || item == eCONTENT_GROUP)
     {
         p = &(id3->grouping);
     }
-    else if (strcasecmp(name, "musicbrainz_trackid") == 0
-        || strcasecmp(name, "http://musicbrainz.org") == 0 )
+    else if (item == eMUSICBRAINZ1 || item == eMUSICBRAINZ2)
     {
         p = &(id3->mb_track_id);
     }
-- 
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