From 67772bbf1b5bb90848d82ac3415738345088086e Mon Sep 17 00:00:00 2001
From: Michiel Van Der Kolk <not.valid@email.address>
Date: Wed, 27 Apr 2005 11:49:51 +0000
Subject: More database maintenance functions..

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6364 a1c6a512-1295-4272-9138-f99709370657
---
 apps/database.c | 119 +++++++++++++++++++++++++++++++++++++++++++-------------
 apps/database.h |   2 +-
 2 files changed, 93 insertions(+), 28 deletions(-)

diff --git a/apps/database.c b/apps/database.c
index 0d562d5..7f605ba 100644
--- a/apps/database.c
+++ b/apps/database.c
@@ -48,7 +48,7 @@
 #ifdef NEW_DB_CODE
 static char sbuf[1024];
 static struct file_entry fe;
-static int currentferecord;
+static int currentfeoffset, currentferecord;
 #endif
 
 int tagdb_fd = -1;
@@ -111,6 +111,9 @@ void tagdb_shutdown(void)
 /* NOTE: All these functions below are yet untested. */
 
 #ifdef NEW_DB_CODE
+
+/*** TagDatabase code ***/
+
 void writetagdbheader() {
         lseek(tagdb_fd,0,SEEK_SET);
         write(tagdb_fd, &tagdbheader, 68);
@@ -121,12 +124,11 @@ void getfentrybyoffset(int offset) {
         fread(tagdb_fd,sbuf,tagdbheader.filelen);
         fread(tagdb_fd,&fe+sizeof(char *),12);
         fe.name=sbuf;
+        currentfeoffset=offset;
         currentferecord=(offset-tagdbheader.filestart)/FILEENTRY_SIZE;
 }
 
-void getfentrybyrecord(int record) {
-        getfentrybyoffset(FILERECORD2OFFSET(record));
-}
+#define getfentrybyrecord(_x_)  getfentrybyoffset(FILERECORD2OFFSET(_x_))
 
 int getfentrybyfilename(char *fname) {
         int min=0;
@@ -146,10 +148,56 @@ int getfentrybyfilename(char *fname) {
         return 0;
 }
 
-int shiftdown(int targetoffset, int startingoffset) {
+int getfentrybyhash(int hash) {
+        int min=0;
+        for(min=0;min<tagdbheader.filecount;min++) {
+          getfentrybyrecord(min);
+          if(hash==fe.hash)
+             return 1;
+        }
+        return 0;
+}
+
+int deletefentry(char *fname) {
+        if(!getfentrybyfilename(fname))
+           return 0;
+        int restrecord = currentferecord+1; 
+        if(currentferecord==tagdbheader.filecount) /* file is last entry */
+           ftruncate(tagdb_fd,lseek(tagdb_fd,0,SEEK_END)-FILEENTRY_SIZE);
+        else 
+           shiftdown(FILERECORD2OFFSET(currentferecord),FILERECORD2OFFSET(restrecord));
+        tagdbheader.filecount--;
+        update_fentryoffsets(restrecord,tagdbheader.filecount);
+        writetagdbheader();
+        return 1;
+}
+
+int update_fentryoffsets(int start, int end) {
+        int i;
+        for(int i=start;i<end;i++) {
+                getfentrybyrecord(i);
+                if(fe.songentry!=-1) {
+                        int *p;
+                        void *songentry=(void *)sbuf+tagdbheader.filelen+2;
+                        lseek(tagdb_fd,fe.songentry,SEEK_SET);
+                        read(tagdb_fd,songentry,SONGENTRY_SIZE);
+                        p=(int *)(songentry+tagdbheader.songlen+8);
+                        if(*p!=currentfeoffset) {
+                           *p=currentfeoffset;
+                          lseek(tagdb_fd,fe.songentry,SEEK_SET);
+                          write(tagdb_fd,songentry,SONGENTRY_SIZE);
+                        }
+                }
+                if(fe.rundbentry!=-1) {
+                        splash(HZ*2, "o.o.. found a rundbentry? o.o; didn't update it, update the code o.o;");
+                }
+        }
+}
+
+int tagdb_shiftdown(int targetoffset, int startingoffset) {
         int amount;
         if(targetoffset>=startingoffset) {
-                splash(HZ*2,"Woah. no beeping way. (shiftdown)");
+                splash(HZ*2,"Woah. no beeping way. (tagdb_shiftdown)");
                 return 0;
         }
         lseek(tagdb_fd,startingoffset,SEEK_SET);
@@ -160,7 +208,7 @@ int shiftdown(int targetoffset, int startingoffset) {
                 written=write(tagdb_fd,sbuf,amount);
                 targetoffset+=written;
                 if(amount!=written) {
-                        splash(HZ*2,"Something went very wrong. expect database corruption.");
+                        splash(HZ*2,"Something went very wrong. expect database corruption. (tagdb_shiftdown)");
                         return 0;
                 }
                 lseek(tagdb_fd,startingoffset,SEEK_SET);
@@ -169,27 +217,44 @@ int shiftdown(int targetoffset, int startingoffset) {
         return 1;
 }
 
-int deletefentry(char *fname) {
-        if(!getfentrybyfilename(fname))
-           return 0;
-        int restrecord = currentferecord+1; 
-        if(currentferecord==tagdbheader.filecount) /* file is last entry */
-           ftruncate(tagdb_fd,lseek(tagdb_fd,0,SEEK_END)-FILEENTRY_SIZE);
-        else 
-           shiftdown(FILERECORD2OFFSET(currentferecord),FILERECORD2OFFSET(restrecord));
-        tagdbheader.filecount--;
-        writetagdbheader();
-        return 1;
-}
-
-int getfentrybyhash(int hash) {
-        int min=0;
-        for(min=0;min<tagdbheader.filecount;min++) {
-          getfentrybyrecord(min);
-          if(hash==fe.hash)
-             return 1;
+int tagdb_shiftup(int targetoffset, int startingoffset) {
+        int amount,amount2;
+        int readpos,writepos,filelen;
+        int ok;
+        if(targetoffset<=startingoffset) {
+                splash(HZ*2,"Um. no. (tagdb_shiftup)");
+        }
+        filelen=lseek(tagdb_fd,0,SEEK_END);
+        readpos=filelen;
+        do {
+          amount=readpos-startingoffset>1024 ? 1024 : readpos-startingoffset;
+          readpos-=amount;
+          writepos=readpos+(targetoffset-startingoffset);
+          lseek(tagdb_fd,readpos,SEEK_SET);
+          amount2=read(tagdb_fd,sbuf,amount);
+          if(amount2!=amount) {
+                  splash(HZ*2,"Something went very wrong. expect database corruption. (tagdb_shiftup)");
+          }
+          lseek(tagdb_fd,writepos,SEEK_SET);
+          amount=write(tagdb_fd,sbuf,amount2);
+          if(amount2!=amount) {
+                  splash(HZ*2,"Something went very wrong. expect database corruption. (tagdb_shiftup)");
+          }
+        } while (amount>0);
+        if(amount==0)
+                return 1;
+        else {
+                splash(HZ*2,"Something went wrong, >.>;; (tagdb_shiftup)");
+                return 0;
         }
-        return 0;
 }
 
+/*** end TagDatabase code ***/
+
+/*** RuntimeDatabase code ***/
+
+
+
+/*** end RuntimeDatabase code ***/
+
 #endif
diff --git a/apps/database.h b/apps/database.h
index cdbd4d4..3828257 100644
--- a/apps/database.h
+++ b/apps/database.h
@@ -65,7 +65,7 @@ struct tagdb_header {
 struct file_entry {
         char *name;
         int hash;
-        int tagentry;
+        int songentry;
         int rundbentry;
 };
 
-- 
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