/*
**	apple_driver.c: extract Mac partition label, maps and boot driver
**
**	Based on Apple_Driver.pl, part of "mkisofs 1.05 PLUS" by Andy Polyakov
**	<appro@fy.chalmers.se> (I don't know Perl, so I rewrote it C ...)
**	(see http://fy.chalmers.se/~appro/mkisofs_plus.html for details)
**
**	usage: apple_driver CDROM_device > HFS_driver_file
**	
**	The format of the HFS driver file:
**
**	HFS CD Label Block				512 bytes
**	Driver Partition Map (for 2048 byte blocks)	512 bytes
**	Driver Partition Map (for 512 byte blocks)	512 bytes
**	Empty						512 bytes
**	Driver Partition				N x 2048 bytes
**	HFS Partition Boot Block			1024 bytes
**
**	By extracting a driver from an Apple CD, you become liable to obey
**	Apple Computer, Inc. Software License Agreements.
**
**	James Pearson 17/5/98
*/

#include <config.h>
#include <mkisofs.h>
#include <mac_label.h>

int
get_732(char *p)
{
	return ((p[3] & 0xff)
	     | ((p[2] & 0xff) << 8)
	     | ((p[1] & 0xff) << 16)
	     | ((p[0] & 0xff) << 24));
}

int
get_722(char *p)
{
	return ((p[1] & 0xff)
	     | ((p[0] & 0xff) << 8));
}


main(int argc, char **argv)
{
	FILE		*fp;
	MacLabel	*mac_label;
	MacPart		*mac_part;
	unsigned char	Block0[HFS_BLOCKSZ];
	unsigned char	block[SECTOR_SIZE];
	unsigned char	bootb[2*HFS_BLOCKSZ];
	unsigned char	pmBlock512[HFS_BLOCKSZ];
	unsigned int	sbBlkSize;
	unsigned int	pmPyPartStart;
	unsigned int	pmPartStatus;
	unsigned int	pmMapBlkCnt;
	int		have_boot = 0, have_hfs = 0;
	int		hfs_start;
	int		i, j;


	if (argc != 2)
	    perr(argv[0], "Usage: %s device-path", argv[0]);

	if ((fp = fopen(argv[1], "rb")) == NULL)
	    perr(argv[0], "can't open %s", argv[1]);

	if (fread(Block0, 1, HFS_BLOCKSZ, fp) != HFS_BLOCKSZ)
	    perr(argv[0], "can't read %s", argv[1]);

	mac_label = (MacLabel *)Block0;
	mac_part = (MacPart *)block;
	
	sbBlkSize = get_722(mac_label->sbBlkSize);

	if (! IS_MAC_LABEL(mac_label) || sbBlkSize != SECTOR_SIZE)
	    perr(argv[0], "%s is not a bootable Mac disk", argv[1]);

	i = 1;
	do {
	    if (fseek(fp, i * HFS_BLOCKSZ, 0) != 0)
		perr(argv[0], "can't seek %s", argv[1]);

	    if (fread(block, 1, HFS_BLOCKSZ, fp) != HFS_BLOCKSZ)
		perr(argv[0], "can't read %s", argv[1]);

	    pmMapBlkCnt = get_732(mac_part->pmMapBlkCnt);

	    if (!have_boot && !strncmp(mac_part->pmPartType, pmPartType_2, 12)) {
		hfs_start = get_732(mac_part->pmPyPartStart);

		fprintf(stderr, "%s: found 512 driver partition (at block %d)\n", argv[0], hfs_start);
		memcpy(pmBlock512, block, HFS_BLOCKSZ);
		have_boot = 1;
	    }

	    if (!have_hfs && !strncmp(mac_part->pmPartType, pmPartType_4, 9)) {

		hfs_start = get_732(mac_part->pmPyPartStart);

		if (fseek(fp, hfs_start*HFS_BLOCKSZ, 0) != 0)
		    perr(argv[0], "can't seek %s", argv[1]);

		if (fread(bootb, 2, HFS_BLOCKSZ, fp) != HFS_BLOCKSZ)
		    perr(argv[0], "can't read %s", argv[1]);

		if (get_722(bootb) == 0x4c4b) {

		    fprintf(stderr, "%s: found HFS partition (at blk %d)\n", argv[0], hfs_start);
		    have_hfs = 1;
		}
	    }
	} while (i++ < pmMapBlkCnt);

	if (!have_hfs || !have_boot)
	    perr(argv[0], "%s is not a bootable Mac disk", argv[1]);

	i = 1;

	do {
	    if (fseek(fp, i*sbBlkSize, 0) != 0)
		perr(argv[0], "can't seek %s", argv[1]);

	    if (fread(block, 1, HFS_BLOCKSZ, fp) != HFS_BLOCKSZ)
		perr(argv[0], "can't read %s", argv[1]);

	    pmMapBlkCnt = get_732(mac_part->pmMapBlkCnt);

	    if (!strncmp(mac_part->pmPartType, pmPartType_2, 12)) {

		int	start, num;

		fprintf(stderr, "%s: extracting %s ", argv[0], mac_part->pmPartType);
		start = get_732(mac_part->pmPyPartStart);
		num = get_732(mac_part->pmPartBlkCnt);
		fwrite(Block0, 1, HFS_BLOCKSZ, stdout);
		fwrite(block, 1, HFS_BLOCKSZ, stdout);
		fwrite(pmBlock512, 1, HFS_BLOCKSZ, stdout);
		memset(block, 0, HFS_BLOCKSZ);
		fwrite(block, 1, HFS_BLOCKSZ, stdout);

		if (fseek(fp, start*sbBlkSize, 0) != 0)
		    perr(argv[0], "can't seek %s", argv[1]);

		for (j=0;j<num;j++) {
		    if (fread(block, 1, sbBlkSize, fp) != sbBlkSize)
			perr(argv[0], "can't read %s", argv[1]);

		    fwrite(block, 1, sbBlkSize, stdout);
		    fprintf(stderr, ".");
		}
		fprintf(stderr, "\n");

		fwrite(bootb, 2, HFS_BLOCKSZ, stdout);
		fclose(fp);
		exit (0);
	    }

	    if (! IS_MAC_PART(mac_part) )
		perr(argv[0], "unable to find boot partition", 0);

	} while (i++ < pmMapBlkCnt);


}

perr(char *a, char *b, char *c)
{
	fprintf(stderr, "%s: ", a);
	fprintf(stderr, b, c);
	fprintf(stderr, "\n");
	exit (1);
}