From 393656a09800fb5c24416e0ada49e2023ef0b22a Mon Sep 17 00:00:00 2001
From: Neils Wagenaar <sdlemu@ngemu.com>
Date: Wed, 6 Oct 2004 14:19:32 +0000
Subject: [PATCH] Added experimental/non-working(?) JaguarCD interface for
 Linux

---
 src/cdintf_linux.cpp | 108 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 102 insertions(+), 6 deletions(-)

diff --git a/src/cdintf_linux.cpp b/src/cdintf_linux.cpp
index bda8346..1d35eea 100644
--- a/src/cdintf_linux.cpp
+++ b/src/cdintf_linux.cpp
@@ -1,10 +1,42 @@
 //
 // OS specific CDROM interface (linux)
 //
-// by James L. Hammons
+// by James L. Hammons and Niels Wagenaar
 //
+// NOTE : This CD-ROM code *could* work with other UN*X related OS. However,
+//        we/I are not sure on this matter.
+//
+// This is very experimental and I have the feeling that this won't even compile.
+// Hell, I don't even have a Linux dev system (broken) or Jaguar CD releases to
+// test this code :(
+//
+// Big thanks to the DOSBOX team which provided us with great knowlegde about
+// CD-ROM access and Linux/UN*X.
+
 
+// *** OS dependent CDROM stuffola ***
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/cdrom.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+// *** End OS dependent ***
 #include "log.h"
+#include "string.h"
+
+// *** Virtual Jaguar dependent ***
+//#include "SDL.h"                // Yes, we use SDL for initializing the CD-ROM and
+//                                // give us access to certain CD-ROM states. But not just yet.
+
+// *** SDL CD-ROM dependent ***        // Not yet needed!
+// SDL_CD      *cdrom;                 // Our variable for SDL CD-ROM access.
+// CDstatus     status;                // Let us get our status.
+// char        *status_str;
+
+// *** Local variables ***
+char	               device_name[512] ; // Devicename, for example /dev/cdrom
 
 //
 // Linux support functions
@@ -13,23 +45,87 @@
 
 bool CDIntfInit(void)
 {
-	WriteLog("CDINTF: Init unimplemented!\n");
-	return false;
+    // Setting device_name to /deb/cdrom. /dev/cdrom is the default CD-ROM
+    // drive on most UN*X systems. Well, I think it is.
+    //
+    // In the future we can probably use SDL for getting CDROM states and
+    // CD-ROM specific information.
+    strcpy(device_name, "/dev/cdrom");
+
+    // Let us open the device_name and check if we can open the CD-ROM.
+    int cdrom_fd = open(device_name, O_RDONLY | O_NONBLOCK);
+    
+	if (cdrom_fd <= 0) 
+    {
+        // CD-ROM isn't accessable.
+        // Write the error in the log file and return false.
+        WriteLog("CDINTF: CDIntfInit - Unable to open CDROM!\n");
+        return false;
+    }    
+    else
+    {
+        // CD-ROM is accessable.
+        // Write the success in the log file and return true.
+        WriteLog("CDINTF: CDIntfInit - Succesfully opened CDROM!\n"); 
+        close(device_name);
+        return true;
+    }
+        
 }
 
 void CDIntfDone(void)
 {
+    // Just in case : closing device_name.
+    WriteLog("CDINTF: CDIntfDone - Closing CDROM!\n");
+    close(device_name);
 }
 
 bool CDIntfReadBlock(uint32 sector, uint8 * buffer)
 {
-	WriteLog("CDINTF: ReadBlock unimplemented!\n");
-	return false;
+	unsigned int   buflen = CD_FRAMESIZE_RAW;          // Raw read, 2352 bytes per sector
+	//unsigned char *buf    = new unsigned int[buflen];	// DOSBOX, do we need this?
+	int ret;
+	struct cdrom_read cdrom_read;
+
+	// Let us open the device_name and check if we can open the CD-ROM.
+    int cdrom_fd = open(device_name, O_RDONLY | O_NONBLOCK);
+	if (cdrom_fd <= 0)
+    {
+        // CD-ROM isn't accessable.
+        // Write the error in the log file and return false.
+        WriteLog("CDINTF: CDIntfReadBlock - Unable to open CDROM!\n");
+        return false;
+    }    
+	
+	// Setting up the cdrom_read struct :
+	cdrom_read.cdread_lba = sector;             // Which sector to read.
+	cdrom_read.cdread_bufaddr = (char*)buffer;  // Where to put the data (?)
+	cdrom_read.cdread_buflen = buflen;          // 2352 bytes/sector -> RAW read
+                                          
+	// Let us read the content we want.	-1 (false) when it didn't work.
+	ret = ioctl(cdrom_fd, CDROMREADRAW, &cdrom_read);		
+
+	// Close the CD-ROM.
+	close(cdrom_fd);
+
+	// The following was taken from DOSBOX. After reading the content, they write
+	// back the information from buf (based upon the size of buflen) to buffer.
+	// I think that this is not needed. *fingers crossed*
+	//
+	// MEM_BlockWrite(buffer, buf, buflen);
+	// delete[] buf;
+	
+	// Uncomment the following for debug reasons.
+	//
+    // WriteLog("CDINTF: CDIntfReadBlock - Reading sector %d!\n", sector);
+    
+	return (ret > 0);
+
 }
 
 uint32 CDIntfGetNumSessions(void)
 {
-	// Still need relevant code here... !!! FIX !!!
+	// Still need relevant code here...
 	return 2;
 }
 
-- 
2.37.2