Abstracted hard disc image handling to separate file.

src/hdd_file.c

@@ -0,0 +1,85 @@
+#define _LARGEFILE_SOURCE
+#define _LARGEFILE64_SOURCE
+#define _GNU_SOURCE
+#include <errno.h>
+
+#include "ibm.h"
+#include "hdd_file.h"
+
+void hdd_load(hdd_file_t *hdd, int d, const char *fn)
+{
+	if (hdd->f == NULL)
+        {
+		/* Try to open existing hard disk image */
+		hdd->f = fopen64(fn, "rb+");
+		if (hdd->f == NULL)
+                {
+			/* Failed to open existing hard disk image */
+			if (errno == ENOENT)
+                        {
+				/* Failed because it does not exist,
+				   so try to create new file */
+				hdd->f = fopen64(fn, "wb+");
+				if (hdd->f == NULL)
+                                {
+					pclog("Cannot create file '%s': %s",
+					      fn, strerror(errno));
+					return;
+				}
+			}
+                        else
+                        {
+				/* Failed for another reason */
+				pclog("Cannot open file '%s': %s",
+				      fn, strerror(errno));
+				return;
+			}
+		}
+	}
+
+        hdd->spt = hdc[d].spt;
+        hdd->hpc = hdc[d].hpc;
+        hdd->tracks = hdc[d].tracks;
+        hdd->sectors = hdc[d].spt * hdc[d].hpc * hdc[d].tracks;
+}
+
+void hdd_close(hdd_file_t *hdd)
+{
+        if (hdd->f)
+        {
+                fclose(hdd->f);
+                hdd->f = NULL;
+        }
+}
+
+void hdd_read_sectors(hdd_file_t *hdd, int offset, int nr_sectors, void *buffer)
+{
+        off64_t addr;
+        
+        addr = offset * 512;
+        fseeko64(hdd->f, addr, SEEK_SET);
+        fread(buffer, nr_sectors*512, 1, hdd->f);
+}
+
+void hdd_write_sectors(hdd_file_t *hdd, int offset, int nr_sectors, void *buffer)
+{
+        off64_t addr;
+        
+        addr = offset * 512;
+        fseeko64(hdd->f, addr, SEEK_SET);
+        fwrite(buffer, nr_sectors*512, 1, hdd->f);
+}
+
+void hdd_format_sectors(hdd_file_t *hdd, int offset, int nr_sectors)
+{
+        off64_t addr;
+        int c;
+        uint8_t zero_buffer[512];
+        
+        memset(zero_buffer, 0, 512);
+        
+        addr = offset * 512;
+        fseeko64(hdd->f, addr, SEEK_SET);
+        for (c = 0; c < nr_sectors; c++)
+                fwrite(zero_buffer, 512, 1, hdd->f);
+}