a36b1d4083
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8349 a1c6a512-1295-4272-9138-f99709370657
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 Jens Arnold
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*
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* Overlay loader for rockboy on Archos
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "plugin.h"
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#if MEM <= 8 && !defined(SIMULATOR)
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PLUGIN_HEADER
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#define OVL_NAME "/.rockbox/viewers/rockboy.ovl"
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#define OVL_DISPLAYNAME "RockBoy"
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struct plugin_api* rb;
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unsigned char *audiobuf;
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int audiobuf_size;
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/* this is the plugin entry point */
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enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
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{
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int fh, readsize;
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struct {
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unsigned long magic;
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unsigned char *start_addr;
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unsigned char *end_addr;
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enum plugin_status(*entry_point)(struct plugin_api*, void*);
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} header;
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rb = api;
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fh = rb->open(OVL_NAME, O_RDONLY);
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if (fh < 0)
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{
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rb->splash(2*HZ, true, "Couldn't open " OVL_DISPLAYNAME " overlay.");
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return PLUGIN_ERROR;
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}
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readsize = rb->read(fh, &header, sizeof(header));
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if (readsize != sizeof(header) || header.magic != 0x524f564c)
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{
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rb->close(fh);
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rb->splash(2*HZ, true, OVL_NAME " is not a valid Rockbox overlay.");
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return PLUGIN_ERROR;
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}
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audiobuf = rb->plugin_get_audio_buffer(&audiobuf_size);
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if (header.start_addr < audiobuf ||
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header.end_addr > audiobuf + audiobuf_size)
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{
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rb->close(fh);
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rb->splash(2*HZ, true, OVL_DISPLAYNAME
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" overlay doesn't fit into memory.");
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return PLUGIN_ERROR;
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}
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rb->memset(header.start_addr, 0, header.end_addr - header.start_addr);
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rb->lseek(fh, 0, SEEK_SET);
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readsize = rb->read(fh, header.start_addr, header.end_addr - header.start_addr);
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rb->close(fh);
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if (readsize <= (int)sizeof(header))
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{
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rb->splash(2*HZ, true, "Error loading " OVL_DISPLAYNAME " overlay.");
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return PLUGIN_ERROR;
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}
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return header.entry_point(api, parameter);
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}
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#endif
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