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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* load image decoder.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "imageviewer.h"
#include "image_decoder.h"
static const char *decoder_names[MAX_IMAGE_TYPES] = {
"bmp",
"jpeg", // Default decoder for jpeg: Use jpeg for old decoder, jpegp for new
"png",
#ifdef HAVE_LCD_COLOR
"ppm",
#endif
"gif",
"jpegp",
};
/* Check file type by magic number or file extension
*
* If the file contains magic number, use it to determine image type.
* Otherwise use file extension to determine image type.
* If the file contains magic number and file extension is not correct,
* informs user that something is wrong.
*/
enum image_type get_image_type(const char *name, bool quiet)
{
static const struct {
char *ext;
enum image_type type;
} ext_list[] = {
{ ".bmp", IMAGE_BMP },
{ ".jpg", IMAGE_JPEG },
{ ".jpe", IMAGE_JPEG },
{ ".jpeg", IMAGE_JPEG },
{ ".png", IMAGE_PNG },
#ifdef HAVE_LCD_COLOR
{ ".ppm", IMAGE_PPM },
#endif
{ ".gif", IMAGE_GIF },
};
static const struct {
char *magic; /* magic number */
int length; /* length of the magic number */
enum image_type type;
} magic_list[] = {
{ "BM", 2, IMAGE_BMP },
{ "\xff\xd8\xff\xe0", 4, IMAGE_JPEG },
{ "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a", 8, IMAGE_PNG },
#ifdef HAVE_LCD_COLOR
{ "P3", 2, IMAGE_PPM },
{ "P6", 2, IMAGE_PPM },
#endif
{ "GIF87a", 6, IMAGE_GIF },
{ "GIF89a", 6, IMAGE_GIF },
};
enum image_type type = IMAGE_UNKNOWN;
const char *ext = rb->strrchr(name, '.');
int i, fd;
char buf[12];
/* check file extention */
if (ext)
{
for (i = 0; i < (int)ARRAYLEN(ext_list); i++)
{
if (!rb->strcasecmp(ext, ext_list[i].ext))
{
type = ext_list[i].type;
break;
}
}
}
/* check magic value in the file */
fd = rb->open(name, O_RDONLY);
if (fd >= 0)
{
rb->memset(buf, 0, sizeof buf);
rb->read(fd, buf, sizeof buf);
rb->close(fd);
for (i = 0; i < (int)ARRAYLEN(magic_list); i++)
{
if (!rb->memcmp(buf, magic_list[i].magic, magic_list[i].length))
{
if (!quiet && type != magic_list[i].type)
{
/* file extension is wrong. */
rb->splashf(HZ*1, "Note: File extension is not correct");
}
type = magic_list[i].type;
break;
}
}
}
return type;
}
static void *decoder_handle = NULL;
const struct image_decoder *load_decoder(struct loader_info *loader_info)
{
const char *name;
char filename[MAX_PATH];
struct imgdec_header *hdr;
struct lc_header *lc_hdr;
if (loader_info->type < 0 || loader_info->type >= MAX_IMAGE_TYPES)
{
rb->splashf(2*HZ, "Unknown type: %d", loader_info->type);
goto error;
}
release_decoder();
name = decoder_names[loader_info->type];
rb->snprintf(filename, MAX_PATH, VIEWERS_DIR "/%s.ovl", name);
/* load decoder to the buffer. */
decoder_handle = rb->lc_open(filename, loader_info->buffer, loader_info->size);
if (!decoder_handle)
{
rb->splashf(2*HZ, "Can't open %s", filename);
goto error;
}
hdr = rb->lc_get_header(decoder_handle);
if (!hdr)
{
rb->splash(2*HZ, "Can't get header");
goto error_close;
}
lc_hdr = &hdr->lc_hdr;
if (lc_hdr->magic != PLUGIN_MAGIC || lc_hdr->target_id != TARGET_ID)
{
rb->splashf(2*HZ, "%s decoder: Incompatible model.", name);
goto error_close;
}
if (lc_hdr->api_version != IMGDEC_API_VERSION ||
hdr->img_api_size > sizeof(struct imgdec_api) ||
hdr->plugin_api_version != PLUGIN_API_VERSION ||
hdr->plugin_api_size > sizeof(struct plugin_api))
{
rb->splashf(2*HZ, "%s decoder: Incompatible version.", name);
goto error_close;
}
*(hdr->api) = rb;
*(hdr->img_api) = loader_info->iv;
/* set remaining buffer size to loader_info. decoder will
* be loaded to the end of the buffer, so fix size only. */
#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
loader_info->size = lc_hdr->load_addr - loader_info->buffer;
#endif
return hdr->decoder;
error_close:
release_decoder();
error:
return NULL;
}
void release_decoder(void)
{
if (decoder_handle != NULL)
{
rb->lc_close(decoder_handle);
decoder_handle = NULL;
}
}
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