Began CD Reader code

1 files changed, 118 insertions, 0 deletions

diff --git a/lib/cdreader.cpp b/lib/cdreader.cpp
new file mode 100644
index 0000000..a501b6d
--- /dev/null
+++ b/lib/cdreader.cpp
@@ -0,0 +1,118 @@
+#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
+
+#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 file %s, cdreader at %p\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) {
+}
+
+bool cdreader::CanWrite() {
+    return 0;
+}
+
+bool cdreader::CanRead() {
+    return 1;
+}
+
+bool cdreader::CanSeek() {
+    return 1;
+}
+
+String cdreader::GetName() {
+    return n + " raw reading";
+}
+
+ssize_t cdreader::GetSize() {
+    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[CD_FRAMESIZE_RAW];
+    size_t r = count;
+    
+    size_t remain = itell % CD_FRAMESIZE_RAW;
+    sectorseek(itell / CD_FRAMESIZE_RAW);
+    
+    while (count > 0) {
+	size_t n = CD_FRAMESIZE_RAW - remain;
+	getsector(sector);
+	bcopy(sector, ((char *) buf) + remain, MIN(n, count));
+	count -= n;
+	remain = 0;
+    }
+    
+    return r;
+}
+
+void cdreader::getsector(void *buf, int sec) throw (GeneralException) {
+    struct cdrom_msf * msf = (struct cdrom_msf *) buf;
+    if (sec >= 0)
+	sector = sec;
+
+    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;
+
+    if (ioctl(GetHandle(), CDROMREADRAW, buf) < 0) {
+	throw GeneralException(String("unable to read cd sector: ") + strerror(errno));
+    }
+    
+    sector++;
+}
+
+void cdreader::sectorseek(int sec) {
+    sector = sec;
+}
+
+#endif