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/*
File handling for reading and writing MP3-TAG, a format by Damaged
Cybernetics.
*
Source by Thorvald Natvig
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mp3info.h"
#include <unistd.h>
/* This one includes the table of the genres. Autogenerated */
#include "genre.h"
void safecopy(char *to,char *from, int maxlen) {
int where;
strncpy(to,from,maxlen);
to[maxlen]=0;
for ( where=maxlen-1 ; ((where>=0) && (to[where]==' ')) ; where-- ) {
to[where]=0 ;
}
}
void spacecopy(char *to,char *from, int maxlen) {
int where;
strncpy(to,from,maxlen);
for ( where=maxlen-1 ; ((where>=0) && (to[where]==0)) ; where--) {
to[where]=' ';
}
}
bool Tag::wipe(FILE *file, size_t filesize) {
int temp;
char buffer[4];
fseek(file,-128,SEEK_END);
temp=fread(&buffer,3,1,file);
if (! strncmp(buffer,"TAG",3)) {
fseek(file,0,SEEK_SET);
if(ftruncate(fileno(file),filesize-128)==0)
return(1);
else return(0);
} else {
return(1);
}
}
bool Tag::get(FILE *file) {
int temp;
tag song;
fseek(file, -128, SEEK_END) ;
temp=fread(&song, 128,1,file);
if (! strncmp(song.tag,"TAG",3)) {
safecopy(title,song.title,30);
safecopy(artist,song.artist,30);
safecopy(album,song.album,30);
safecopy(year,song.year,4);
safecopy(comment,song.comment,30);
gennum= song.genre & 0xFF;
if ((gennum<0) || (gennum >= GENRE_LARGEST)) {
gennum = GENRE_LARGEST;
}
strcpy(genre,genres[gennum]);
return(1);
} else {
return(0);
}
}
Tag::Tag() {
title[0]=0;
artist[0]=0;
album[0]=0;
year[0]=0;
comment[0]=0;
genre[0]=0;
gennum=-1;
}
void Tag::copy(Tag *from) {
if (from->title[0]) strncpy(title,from->title,30);
if (from->artist[0]) strncpy(artist,from->artist,30);
if (from->album[0]) strncpy(album,from->album,30);
if (from->year[0]) strncpy(year,from->year,4);
if (from->comment[0]) strncpy(comment,from->comment,30);
if (from->gennum != -1 ) gennum=from->gennum;
if ((gennum<0) || (gennum >= GENRE_LARGEST)) {
gennum=0;
}
strcpy(genre,genres[gennum]);
}
bool Tag::set(FILE *file) {
size_t temp;
tag song;
spacecopy(song.title,title,30);
spacecopy(song.artist,artist,30);
spacecopy(song.album,album,30);
spacecopy(song.year,year,4);
spacecopy(song.comment,comment,30);
if (gennum >= GENRE_LARGEST) {
song.genre=0;
} else {
temp=gennum;
song.genre=(unsigned char)temp;
}
fseek(file, -128, SEEK_END) ;
temp=fread(&song,3,1,file) ;
if (! strncmp(song.tag,"TAG",3)) {
fseek(file, -128, SEEK_END) ;
} else {
fseek(file, 0 , SEEK_END) ;
}
strncpy(song.tag,"TAG",3);
temp=fwrite(&song,128,1,file);
if (temp==1) {
return (true) ;
} else {
return (false) ;
}
}
void Tag::printgenres(int format) {
int i;
int c=0;
if (format==0) {
for (i=0; i<=GENRE_LARGEST;i++) {
printf("%2i %-20s",i,genres[i]);
c=(c+1)%3;
if (c==0) printf("\n");
}
if (c!=0) printf("\n");
} else if (format==1) {
for (i=0; i<=GENRE_LARGEST;i++) {
printf("%2i %s\n",i,genres[i]);
}
} else if (format>0) {
for (i=0; i<=GENRE_LARGEST;i++) {
printf("%s\n",genres[i]);
}
} else {
c=-(format+1);
for (i=0; i<GENRE_LARGEST;i++) {
printf(" \"%i\" \"%s\" \"%s\"",i,genres[i],(i==c) ? "On" : "Off");
}
}
}
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