translate.c

使用libscsi做的一系列cdrom操作工具程序。包含cdwrite,cdflush,cdda三个程序

#include <string.h>
#include <stdio.h>
#include <scsi/cd.h>
#include "cdda.h"



u_long
translate(SCSI *fd, char *time)
{
    static struct sc_cd_toc *toc = NULL;
    static int track;

    int len, i;
    u_long lba = 0;
    char *t, *sl, *msf, *tok;

    if (toc == NULL) {
	    len = sizeof(struct sc_cd_toc) + 99*sizeof(struct sc_cd_toc_track);
	    if ((toc=(struct sc_cd_toc *)malloc(len)) == NULL) {
		fprintf(stderr, "%s: malloc failure\n");
		return -1;
	    }
	    
	    if (sc_cd_read_toc(fd, 0, 0, len, toc) < 0) {
		sc_fstatus(fd, stderr, prg, "cd-read-toc", 3);
		return -1;
	    }
	    track = toc->first;
    }

    if (time) {
	if ((t=strdup(time)) == NULL) {
	    fprintf(stderr, "%s: malloc failure\n");
	    return -1;
	}
    
	msf = NULL;
	if (sl=strchr(t, '/')) {
	    *sl = '\0';
	    track = atoi(t);
	    if (strchr(sl+1, ':')) {
		msf = sl+1;
	    }
	    else {
		fprintf(stderr, "%s: track/index time spec not implemented\n",
			prg);
		return -1;
	    }
	}
	else if (strchr(t, ':')) {
	    msf = t;
	}
	else
	    track = atoi(t);
	
	if (msf) {
	    tok = strtok(msf, ":");
	    lba = atoi(tok) * 60;
	    tok = strtok(NULL, ":");
	    lba = (lba+atoi(tok)) * 75;
	    if (tok=strtok(NULL, ":")) {
		lba += atoi(tok);
	    }
	}

	free(t);
    }
    else {
	lba = 0;
	track++;
    }

    for (i=0; i<toc->notr; i++) {
	if (toc->track[i].number == track
	    || (i>0 && toc->track[i-1].number == track-1))
	    return toc->track[i].addr + lba;
    }

    fprintf(stderr, "%s: illegal track: %d\n",
	    prg, track);
    return -1;
}