forked from len0rd/rockbox
Obvious optimizations (i wasn't quite awake yet) + Code formatting policy.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6365 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michiel Van Der Kolk
parent
67772bbf1b
commit
7e3f91d3d8
1 changed files with 104 additions and 103 deletions
207
apps/database.c
207
apps/database.c
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@ -115,138 +115,139 @@ void tagdb_shutdown(void)
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/*** TagDatabase code ***/
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void writetagdbheader() {
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lseek(tagdb_fd,0,SEEK_SET);
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write(tagdb_fd, &tagdbheader, 68);
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lseek(tagdb_fd,0,SEEK_SET);
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write(tagdb_fd, &tagdbheader, 68);
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}
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void getfentrybyoffset(int offset) {
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lseek(tagdb_fd,offset,SEEK_SET);
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fread(tagdb_fd,sbuf,tagdbheader.filelen);
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fread(tagdb_fd,&fe+sizeof(char *),12);
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fe.name=sbuf;
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currentfeoffset=offset;
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currentferecord=(offset-tagdbheader.filestart)/FILEENTRY_SIZE;
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lseek(tagdb_fd,offset,SEEK_SET);
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fread(tagdb_fd,sbuf,tagdbheader.filelen);
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fread(tagdb_fd,&fe+sizeof(char *),12);
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fe.name=sbuf;
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currentfeoffset=offset;
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currentferecord=(offset-tagdbheader.filestart)/FILEENTRY_SIZE;
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}
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#define getfentrybyrecord(_x_) getfentrybyoffset(FILERECORD2OFFSET(_x_))
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int getfentrybyfilename(char *fname) {
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int min=0;
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int max=tagdbheader.filecount;
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while(min<max) {
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int mid=(min+max)/2;
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int compare;
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getfentrybyrecord(mid);
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compare=strcasecmp(fname,fe.name));
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if(compare==0)
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int min=0;
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int max=tagdbheader.filecount;
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while(min<max) {
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int mid=(min+max)/2;
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int compare;
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getfentrybyrecord(mid);
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compare=strcasecmp(fname,fe.name));
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if(compare==0)
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return 1;
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else if(compare<0)
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else if(compare<0)
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max=mid;
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else
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else
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min=mid+1;
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}
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return 0;
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}
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return 0;
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}
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int getfentrybyhash(int hash) {
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int min=0;
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for(min=0;min<tagdbheader.filecount;min++) {
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getfentrybyrecord(min);
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if(hash==fe.hash)
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int min=0;
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for(min=0;min<tagdbheader.filecount;min++) {
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getfentrybyrecord(min);
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if(hash==fe.hash)
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return 1;
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}
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return 0;
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}
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return 0;
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}
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int deletefentry(char *fname) {
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if(!getfentrybyfilename(fname))
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return 0;
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int restrecord = currentferecord+1;
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if(currentferecord==tagdbheader.filecount) /* file is last entry */
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ftruncate(tagdb_fd,lseek(tagdb_fd,0,SEEK_END)-FILEENTRY_SIZE);
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else
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shiftdown(FILERECORD2OFFSET(currentferecord),FILERECORD2OFFSET(restrecord));
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tagdbheader.filecount--;
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update_fentryoffsets(restrecord,tagdbheader.filecount);
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writetagdbheader();
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return 1;
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if(!getfentrybyfilename(fname))
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return 0;
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int restrecord = currentferecord+1;
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if(currentferecord!=tagdbheader.filecount) /* file is not last entry */
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shiftdown(FILERECORD2OFFSET(currentferecord),FILERECORD2OFFSET(restrecord),(tagdbheader.filecount-restrecord)*FILEENTRY_SIZE);
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ftruncate(tagdb_fd,lseek(tagdb_fd,0,SEEK_END)-FILEENTRY_SIZE);
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tagdbheader.filecount--;
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update_fentryoffsets(restrecord,tagdbheader.filecount);
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writetagdbheader();
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return 1;
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}
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int update_fentryoffsets(int start, int end) {
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int i;
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for(int i=start;i<end;i++) {
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getfentrybyrecord(i);
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if(fe.songentry!=-1) {
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int *p;
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void *songentry=(void *)sbuf+tagdbheader.filelen+2;
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lseek(tagdb_fd,fe.songentry,SEEK_SET);
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read(tagdb_fd,songentry,SONGENTRY_SIZE);
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p=(int *)(songentry+tagdbheader.songlen+8);
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if(*p!=currentfeoffset) {
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*p=currentfeoffset;
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lseek(tagdb_fd,fe.songentry,SEEK_SET);
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write(tagdb_fd,songentry,SONGENTRY_SIZE);
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}
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}
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if(fe.rundbentry!=-1) {
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splash(HZ*2, "o.o.. found a rundbentry? o.o; didn't update it, update the code o.o;");
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}
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}
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int i;
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for(int i=start;i<end;i++) {
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getfentrybyrecord(i);
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if(fe.songentry!=-1) {
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int p;
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lseek(tagdb_fd,fe.songentry+tagdbheader.songlen+8,SEEK_SET);
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read(tagdb_fd,&p,sizeof(int));
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if(p!=currentfeoffset) {
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p=currentfeoffset;
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lseek(tagdb_fd,fe.songentry+tagdbheader.songlen+8,SEEK_SET);
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write(tagdb_fd,&p,sizeof(int));
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}
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}
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if(fe.rundbentry!=-1) {
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splash(HZ*2, "o.o.. found a rundbentry? o.o; didn't update it, update the code o.o;");
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}
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}
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}
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int tagdb_shiftdown(int targetoffset, int startingoffset) {
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int amount;
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if(targetoffset>=startingoffset) {
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splash(HZ*2,"Woah. no beeping way. (tagdb_shiftdown)");
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return 0;
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int tagdb_shiftdown(int targetoffset, int startingoffset, int bytes) {
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int amount;
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if(targetoffset>=startingoffset) {
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splash(HZ*2,"Woah. no beeping way. (tagdb_shiftdown)");
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return 0;
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}
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lseek(tagdb_fd,startingoffset,SEEK_SET);
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while(amount=read(tagdb_fd,sbuf,bytes > 1024 ? 1024 : bytes)) {
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int written;
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startingoffset+=amount;
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lseek(tagdb_fd,targetoffset,SEEK_SET);
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written=write(tagdb_fd,sbuf,amount);
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targetoffset+=written;
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if(amount!=written) {
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splash(HZ*2,"Something went very wrong. expect database corruption. (tagdb_shiftdown)");
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return 0;
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}
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lseek(tagdb_fd,startingoffset,SEEK_SET);
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while(amount=read(tagdb_fd,sbuf,1024)) {
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int written;
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startingoffset+=amount;
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lseek(tagdb_fd,targetoffset,SEEK_SET);
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written=write(tagdb_fd,sbuf,amount);
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targetoffset+=written;
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if(amount!=written) {
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splash(HZ*2,"Something went very wrong. expect database corruption. (tagdb_shiftdown)");
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return 0;
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}
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lseek(tagdb_fd,startingoffset,SEEK_SET);
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}
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ftruncate(tagdb_fd,lseek(tagdb_fd,0,SEEK_END) - (startingoffset-targetoffset));
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return 1;
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bytes-=amount;
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}
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return 1;
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}
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int tagdb_shiftup(int targetoffset, int startingoffset) {
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int amount,amount2;
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int readpos,writepos,filelen;
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int ok;
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if(targetoffset<=startingoffset) {
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splash(HZ*2,"Um. no. (tagdb_shiftup)");
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int tagdb_shiftup(int targetoffset, int startingoffset, int bytes) {
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int amount,amount2;
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int readpos,writepos,filelen;
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int ok;
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if(targetoffset<=startingoffset) {
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splash(HZ*2,"Um. no. (tagdb_shiftup)");
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return 0;
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}
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filelen=lseek(tagdb_fd,0,SEEK_END);
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readpos=startingoffset+bytes;
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do {
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amount=bytes>1024 ? 1024 : bytes;
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readpos-=amount;
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writepos=readpos+targetoffset-startingoffset;
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lseek(tagdb_fd,readpos,SEEK_SET);
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amount2=read(tagdb_fd,sbuf,amount);
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if(amount2!=amount) {
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splash(HZ*2,"Something went very wrong. expect database corruption. (tagdb_shiftup)");
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return 0;
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}
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filelen=lseek(tagdb_fd,0,SEEK_END);
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readpos=filelen;
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do {
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amount=readpos-startingoffset>1024 ? 1024 : readpos-startingoffset;
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readpos-=amount;
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writepos=readpos+(targetoffset-startingoffset);
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lseek(tagdb_fd,readpos,SEEK_SET);
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amount2=read(tagdb_fd,sbuf,amount);
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if(amount2!=amount) {
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splash(HZ*2,"Something went very wrong. expect database corruption. (tagdb_shiftup)");
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}
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lseek(tagdb_fd,writepos,SEEK_SET);
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amount=write(tagdb_fd,sbuf,amount2);
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if(amount2!=amount) {
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splash(HZ*2,"Something went very wrong. expect database corruption. (tagdb_shiftup)");
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}
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} while (amount>0);
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if(amount==0)
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return 1;
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else {
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splash(HZ*2,"Something went wrong, >.>;; (tagdb_shiftup)");
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return 0;
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lseek(tagdb_fd,writepos,SEEK_SET);
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amount=write(tagdb_fd,sbuf,amount2);
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if(amount2!=amount) {
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splash(HZ*2,"Something went very wrong. expect database corruption. (tagdb_shiftup)");
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return 0;
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}
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bytes-=amount;
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} while (amount>0);
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if(bytes==0)
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return 1;
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else {
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splash(HZ*2,"Something went wrong, >.>;; (tagdb_shiftup)");
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return 0;
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}
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}
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/*** end TagDatabase code ***/
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