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#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "cdreader.h"
#include "Exceptions.h"
#include "generic.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define _(x) x
#endif
bool cdreader::CanWrite() const {
return 0;
}
bool cdreader::CanRead() const {
return 1;
}
bool cdreader::CanSeek() const {
return 1;
}
String cdreader::GetName() const {
return n + " raw reading";
}
ssize_t cdreader::GetSize() const {
return -1;
}
off_t cdreader::seek(off_t offset, int whence) throw (GeneralException) {
switch (whence) {
case SEEK_SET:
itell = offset;
break;
case SEEK_CUR:
itell += offset;
break;
case SEEK_END:
throw GeneralException("Can not yet seek from the end of a CD.");
}
return itell;
}
ssize_t cdreader::read(void *buf, size_t count) throw (GeneralException) {
char sector[2352];
size_t r = count;
size_t remain = itell % 2352;
sectorseek(itell / 2352);
while (count > 0) {
size_t n = MIN(2352 - remain, count);
getsector(sector);
bcopy(sector + remain, buf, n);
buf = ((char *) buf) + n;
itell += n;
count -= n;
remain = 0;
}
return r;
}
void cdreader::sectorseek(int sec) {
sector = sec;
}
#ifdef __linux__
#include <sys/ioctl.h>
#include <linux/cdrom.h>
cdreader::cdreader(const String & no) throw (GeneralException) :
Handle(open(no.to_charp(), O_RDONLY)), n(no), sector(0) {
#ifdef DEBUG
fprintf(stderr, "Opening cdrom device %s\n", no.to_charp(), this);
#endif
if (GetHandle() < 0) {
throw IOGeneral(String(_("Error opening file ")) + no + _(" for reading: ") + strerror(errno));
}
struct stat s;
fstat(GetHandle(), &s);
if (!S_ISBLK(s.st_mode)) {
throw GeneralException(no + " is not a block device.");
}
}
cdreader::cdreader(const cdreader & i) : Handle(i), n(i.n) {
}
void cdreader::getsector(void *buf, int sec) throw (GeneralException) {
struct cdrom_msf * msf = (struct cdrom_msf *) buf;
if (sec >= 0)
sector = sec;
sector += 150;
msf->cdmsf_min0 = sector /CD_SECS /CD_FRAMES;
msf->cdmsf_sec0 = (sector /CD_FRAMES)%CD_SECS;
msf->cdmsf_frame0= sector %CD_FRAMES;
msf->cdmsf_min1 = (sector+1)/CD_SECS /CD_FRAMES;
msf->cdmsf_sec1 = ((sector+1)/CD_FRAMES)%CD_SECS;
msf->cdmsf_frame1= (sector+1)%CD_FRAMES;
sector -= 150;
if (ioctl(GetHandle(), CDROMREADRAW, buf) < 0) {
throw GeneralException(String("unable to read cd sector ") + sector + ": " + strerror(errno));
}
sector++;
}
#endif
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