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rockbox/apps/dbtree.c
Björn Stenberg c985fa0e52 Added some consistency checks 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5583 a1c6a512-1295-4272-9138-f99709370657
2005-01-17 15:34:43 +00:00

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9.5 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Björn Stenberg
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include "file.h"
#include "screens.h"
#include "kernel.h"
#include "tree.h"
#include "lcd.h"
#include "font.h"
#include "settings.h"
#include "icons.h"
#include "status.h"
#include "debug.h"
#include "button.h"
#include "menu.h"
#include "main_menu.h"
#include "mpeg.h"
#include "misc.h"
#include "ata.h"
#include "wps.h"
#include "filetypes.h"
#include "applimits.h"
#include "dbtree.h"
#include "icons.h"
#ifdef LITTLE_ENDIAN
#include <netinet/in.h>
#define BE32(_x_) htonl(_x_)
#else
#define BE32(_x_) _x_
#endif
#define ID3DB_VERSION 1
static int fd;
static int
songstart, albumstart, artiststart,
songcount, albumcount, artistcount,
songlen, songarraylen,
albumlen, albumarraylen,
artistlen, initialized = 0;
int db_init(void)
{
unsigned int version;
unsigned int buf[12];
unsigned char* ptr = (char*)buf;
fd = open(ROCKBOX_DIR "/rockbox.id3db", O_RDONLY);
if (fd < 0) {
DEBUGF("Failed opening database\n");
return -1;
}
read(fd, buf, 48);
if (ptr[0] != 'R' ||
ptr[1] != 'D' ||
ptr[2] != 'B')
{
DEBUGF("File is not a rockbox id3 database, aborting\n");
return -1;
}
version = BE32(buf[0]) & 0xff;
if (version != ID3DB_VERSION)
{
DEBUGF("Unsupported database version %d, aborting.\n");
return -1;
}
DEBUGF("Version: RDB%d\n", version);
songstart = BE32(buf[1]);
songcount = BE32(buf[2]);
songlen = BE32(buf[3]);
DEBUGF("Number of songs: %d\n", songcount);
DEBUGF("Songstart: %x\n", songstart);
DEBUGF("Songlen: %d\n", songlen);
albumstart = BE32(buf[4]);
albumcount = BE32(buf[5]);
albumlen = BE32(buf[6]);
songarraylen = BE32(buf[7]);
DEBUGF("Number of albums: %d\n", albumcount);
DEBUGF("Albumstart: %x\n", albumstart);
DEBUGF("Albumlen: %d\n", albumlen);
artiststart = BE32(buf[8]);
artistcount = BE32(buf[9]);
artistlen = BE32(buf[10]);
albumarraylen = BE32(buf[11]);
DEBUGF("Number of artists: %d\n", artistcount);
DEBUGF("Artiststart: %x\n", artiststart);
DEBUGF("Artistlen: %d\n", artistlen);
if (songstart > albumstart ||
albumstart > artiststart)
{
DEBUGF("Corrupt id3db database, aborting.\n");
return -1;
}
initialized = 1;
return 0;
}
int db_load(struct tree_context* c, bool* dir_buffer_full)
{
int i, offset, len, rc;
int dcachesize = global_settings.max_files_in_dir * sizeof(struct entry);
int max_items, itemcount, stringlen;
unsigned int* nptr = (void*) c->name_buffer;
unsigned int* dptr = c->dircache;
unsigned int* safeplace = NULL;
int table = c->currtable;
int extra = c->currextra;
if (!initialized) {
DEBUGF("ID3 database is not initialized.\n");
return 0;
}
c->dentry_size = 2 * sizeof(int);
DEBUGF("db_load(%d, %x)\n", table, extra);
if (!table) {
table = allartists;
c->currtable = table;
}
switch (table) {
case allsongs:
offset = songstart;
itemcount = songcount;
stringlen = songlen;
break;
case allalbums:
offset = albumstart;
itemcount = albumcount;
stringlen = albumlen;
break;
case allartists:
offset = artiststart;
itemcount = artistcount;
stringlen = artistlen;
break;
case albums:
/* 'extra' is offset to the artist */
len = albumarraylen * 4;
safeplace = (void*)(c->name_buffer + c->name_buffer_size - len);
//DEBUGF("Seeking to %x\n", extra + artistlen);
lseek(fd, extra + artistlen, SEEK_SET);
rc = read(fd, safeplace, len);
if (rc < len)
return -1;
#ifdef LITTLE_ENDIAN
for (i=0; i<albumarraylen; i++)
safeplace[i] = BE32(safeplace[i]);
#endif
offset = safeplace[0];
itemcount = albumarraylen;
stringlen = albumlen;
break;
case songs:
/* 'extra' is offset to the album */
len = songarraylen * 4;
safeplace = (void*)(c->name_buffer + c->name_buffer_size - len);
//DEBUGF("Seeking to %x\n", extra + albumlen + 4);
lseek(fd, extra + albumlen + 4, SEEK_SET);
rc = read(fd, safeplace, len);
if (rc < len)
return -1;
#ifdef LITTLE_ENDIAN
for (i=0; i<songarraylen; i++)
safeplace[i] = BE32(safeplace[i]);
#endif
offset = safeplace[0];
itemcount = songarraylen;
stringlen = songlen;
break;
default:
DEBUGF("Unsupported table %d\n", table);
return -1;
}
max_items = dcachesize / c->dentry_size;
if (!safeplace) {
//DEBUGF("Seeking to %x\n", offset);
lseek(fd, offset, SEEK_SET);
}
/* name_buffer (nptr) contains only names, null terminated.
the first word of dcache (dptr) is a pointer to the name,
the rest is table specific. see below. */
if (itemcount > max_items)
if (dir_buffer_full)
*dir_buffer_full = true;
if (max_items > itemcount) {
max_items = itemcount;
}
for ( i=0; i < max_items; i++ ) {
int rc, skip=0;
if (safeplace) {
if (!safeplace[i])
break;
//DEBUGF("Seeking to %x\n", safeplace[i]);
lseek(fd, safeplace[i], SEEK_SET);
offset = safeplace[i];
}
/* read name */
rc = read(fd, nptr, stringlen);
if (rc < stringlen)
{
DEBUGF("%d read(%d) returned %d\n", i, stringlen, rc);
return -1;
}
/* store name pointer in dir cache */
dptr[0] = (unsigned int)nptr;
switch (table) {
case songs:
case allsongs:
/* save offset of this song */
skip = 12;
dptr[1] = offset;
break;
case allalbums:
case albums:
/* save offset of this album */
skip = songarraylen * 4 + 4;
dptr[1] = offset;
break;
case allartists:
/* save offset of this artist */
skip = albumarraylen * 4;
dptr[1] = offset;
break;
}
//DEBUGF("%x: %s\n", dptr[1], dptr[0]);
if (skip)
lseek(fd, skip, SEEK_CUR);
/* next name is stored immediately after this */
nptr = (void*)nptr + strlen((char*)nptr) + 1;
if ((void*)nptr > (void*)c->name_buffer + c->name_buffer_size) {
DEBUGF("Name buffer overflow (%d)\n",i);
break;
}
dptr = (void*)dptr + c->dentry_size;
if (!safeplace)
offset += stringlen + skip;
}
c->filesindir = i;
return i;
}
void db_enter(struct tree_context* c)
{
switch (c->currtable) {
case allartists:
case albums:
c->dirpos[c->dirlevel] = c->dirstart;
c->cursorpos[c->dirlevel] = c->dircursor;
c->table_history[c->dirlevel] = c->currtable;
c->extra_history[c->dirlevel] = c->currextra;
c->dirlevel++;
break;
default:
break;
}
switch (c->currtable) {
case allartists:
c->currtable = albums;
c->currextra = ((int*)c->dircache)[(c->dircursor + c->dirstart)*2 + 1];
break;
case albums:
c->currtable = songs;
c->currextra = ((int*)c->dircache)[(c->dircursor + c->dirstart)*2 + 1];
break;
case songs:
splash(HZ,true,"No playing implemented yet");
#if 0
/* find filenames, build playlist, play */
playlist_create(NULL,NULL);
#endif
break;
default:
break;
}
c->dirstart = c->dircursor = 0;
}
void db_exit(struct tree_context* c)
{
c->dirlevel--;
c->dirstart = c->dirpos[c->dirlevel];
c->dircursor = c->cursorpos[c->dirlevel];
c->currtable = c->table_history[c->dirlevel];
c->currextra = c->extra_history[c->dirlevel];
}
#ifdef HAVE_LCD_BITMAP
const char* db_get_icon(struct tree_context* c)
{
int icon;
switch (c->currtable)
{
case allsongs:
case songs:
icon = File;
break;
default:
icon = Folder;
break;
}
return bitmap_icons_6x8[icon];
}
#else
int db_get_icon(struct tree_context* c)
{
(void)c;
return Folder;
}
#endif
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