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/*
* cdimage.c
* Layered data source for CD images in raw mode.
*
* Copyright (c) 2003 Christoph Pfisterer
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "global.h"
/*
* types
*/
typedef struct cdimage_source {
SOURCE c;
u8 off;
} CDIMAGE_SOURCE;
/*
* helper functions
*/
static SOURCE *init_cdimage_source(SOURCE *foundation, u8 offset);
static int read_block_cdimage(SOURCE *s, u8 pos, void *buf);
/*
* cd image detection
*/
static unsigned char syncbytes[12] =
{ 0, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 0 };
void detect_cdimage(SECTION *section, int level)
{
int mode, off;
unsigned char *buf;
SOURCE *s;
if (get_buffer(section, 0, 2352, (void **)&buf) < 2352)
return;
/* check sync bytes as signature */
if (memcmp(buf, syncbytes, 12) != 0)
return;
/* get mode of the track -- this determines sector layout */
mode = buf[15];
if (mode == 1) {
/* standard data track */
print_line(level, "Raw CD image, Mode 1");
off = 16;
} else if (mode == 2) {
/* free-form track, assume XA form 1 */
print_line(level, "Raw CD image, Mode 2, assuming Form 1");
off = 24;
} else
return;
/* create and analyze wrapped source */
s = init_cdimage_source(section->source, section->pos + off);
analyze_source(s, level);
close_source(s);
/* don't run other analyzers */
stop_detect();
}
/*
* initialize the cd image source
*/
static SOURCE *init_cdimage_source(SOURCE *foundation, u8 offset)
{
CDIMAGE_SOURCE *src;
src = (CDIMAGE_SOURCE *)malloc(sizeof(CDIMAGE_SOURCE));
if (src == NULL)
bailout("Out of memory");
memset(src, 0, sizeof(CDIMAGE_SOURCE));
if (foundation->size_known) {
src->c.size_known = 1;
src->c.size = ((foundation->size - offset + 304) / 2352) * 2048;
/* TODO: pass the size in from the SECTION record and use it */
}
src->c.blocksize = 2048;
src->c.foundation = foundation;
src->c.read_block = read_block_cdimage;
src->c.close = NULL;
src->off = offset;
return (SOURCE *)src;
}
/*
* raw read
*/
static int read_block_cdimage(SOURCE *s, u8 pos, void *buf)
{
SOURCE *fs = s->foundation;
u8 filepos;
/* translate position */
filepos = (pos / 2048) * 2352 + ((CDIMAGE_SOURCE *)s)->off;
/* read from lower layer */
if (get_buffer_real(fs, filepos, 2048, buf, NULL) < 2048)
return 0;
return 1;
}
/* EOF */
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