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Diffstat (limited to 'trunk/src/lib/formats/svi_dsk.c')
-rw-r--r--trunk/src/lib/formats/svi_dsk.c171
1 files changed, 171 insertions, 0 deletions
diff --git a/trunk/src/lib/formats/svi_dsk.c b/trunk/src/lib/formats/svi_dsk.c
new file mode 100644
index 00000000000..0d97c59e0c1
--- /dev/null
+++ b/trunk/src/lib/formats/svi_dsk.c
@@ -0,0 +1,171 @@
+/*********************************************************************
+
+ formats/svi_dsk.c
+
+ SVI318 disk images
+
+*********************************************************************/
+
+#include <string.h>
+
+#include "svi_dsk.h"
+#include "basicdsk.h"
+
+static FLOPPY_IDENTIFY(svi_dsk_identify)
+{
+ *vote = ((floppy_image_size(floppy) == (172032)) || (floppy_image_size(floppy) == (346112))) ? 100 : 0;
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+static int svi_get_heads_per_disk(floppy_image_legacy *floppy)
+{
+ return (floppy_image_size(floppy) == (172032)) ? 1 : 2;
+}
+
+static int svi_get_tracks_per_disk(floppy_image_legacy *floppy)
+{
+ return 40;
+}
+
+static UINT64 svi_translate_offset(floppy_image_legacy *floppy,
+ int track, int head, int sector)
+{
+ UINT64 o;
+ if ((track==0) && (head==0))
+ o = sector*128;
+ else
+ o = ((track*((floppy_image_size(floppy) == (172032)) ? 1 : 2)+head)*17+sector)*256-2048; /* (17*256)-(18*128)=2048 */
+
+ return o;
+}
+
+static floperr_t get_offset(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, UINT64 *offset)
+{
+ UINT64 offs;
+ /* translate the sector to a raw sector */
+ if (!sector_is_index)
+ {
+ sector -= 1;
+ }
+ /* check to see if we are out of range */
+ if ((head < 0) || (head >= ((floppy_image_size(floppy) == (172032)) ? 1 : 2)) || (track < 0) || (track >= 40)
+ || (sector < 0) || (sector >= ((head==0 && track==0) ? 18 : 17)))
+ return FLOPPY_ERROR_SEEKERROR;
+
+ offs = svi_translate_offset(floppy, track, head, sector);
+ if (offset)
+ *offset = offs;
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+
+
+static floperr_t internal_svi_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, void *buffer, size_t buflen)
+{
+ UINT64 offset;
+ floperr_t err;
+ err = get_offset(floppy, head, track, sector, sector_is_index, &offset);
+ if (err)
+ return err;
+
+ floppy_image_read(floppy, buffer, offset, buflen);
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+
+
+static floperr_t internal_svi_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, const void *buffer, size_t buflen, int ddam)
+{
+ UINT64 offset;
+ floperr_t err;
+
+ err = get_offset(floppy, head, track, sector, sector_is_index, &offset);
+ if (err)
+ return err;
+
+ floppy_image_write(floppy, buffer, offset, buflen);
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+
+
+static floperr_t svi_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
+{
+ return internal_svi_read_sector(floppy, head, track, sector, FALSE, buffer, buflen);
+}
+
+static floperr_t svi_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
+{
+ return internal_svi_write_sector(floppy, head, track, sector, FALSE, buffer, buflen, ddam);
+}
+
+static floperr_t svi_read_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
+{
+ return internal_svi_read_sector(floppy, head, track, sector, TRUE, buffer, buflen);
+}
+
+static floperr_t svi_write_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
+{
+ return internal_svi_write_sector(floppy, head, track, sector, TRUE, buffer, buflen, ddam);
+}
+
+static floperr_t svi_get_sector_length(floppy_image_legacy *floppy, int head, int track, int sector, UINT32 *sector_length)
+{
+ floperr_t err;
+ err = get_offset(floppy, head, track, sector, FALSE, NULL);
+ if (err)
+ return err;
+
+ if (sector_length) {
+ *sector_length = (head==0 && track==0) ? 128 : 256;
+ }
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+
+
+static floperr_t svi_get_indexed_sector_info(floppy_image_legacy *floppy, int head, int track, int sector_index, int *cylinder, int *side, int *sector, UINT32 *sector_length, unsigned long *flags)
+{
+ sector_index += 1;
+ if (cylinder)
+ *cylinder = track;
+ if (side)
+ *side = head;
+ if (sector)
+ *sector = sector_index;
+ if (flags)
+ /* TODO: read DAM or DDAM and determine flags */
+ *flags = 0;
+ return svi_get_sector_length(floppy, head, track, sector_index, sector_length);
+}
+
+
+static FLOPPY_CONSTRUCT(svi_dsk_construct)
+{
+ struct FloppyCallbacks *callbacks;
+ callbacks = floppy_callbacks(floppy);
+ callbacks->read_sector = svi_read_sector;
+ callbacks->write_sector = svi_write_sector;
+ callbacks->read_indexed_sector = svi_read_indexed_sector;
+ callbacks->write_indexed_sector = svi_write_indexed_sector;
+ callbacks->get_sector_length = svi_get_sector_length;
+ callbacks->get_heads_per_disk = svi_get_heads_per_disk;
+ callbacks->get_tracks_per_disk = svi_get_tracks_per_disk;
+ callbacks->get_indexed_sector_info = svi_get_indexed_sector_info;
+
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+
+
+/* ----------------------------------------------------------------------- */
+
+LEGACY_FLOPPY_OPTIONS_START( svi318 )
+ LEGACY_FLOPPY_OPTION( svi_dsk, "dsk", "SVI-318 floppy disk image", svi_dsk_identify, svi_dsk_construct, NULL, NULL)
+ LEGACY_FLOPPY_OPTION( svi_cpm, "dsk", "SVI-728 DSDD CP/M disk image", basicdsk_identify_default, basicdsk_construct_default, NULL,
+ HEADS([2])
+ TRACKS([40])
+ SECTORS([17])
+ SECTOR_LENGTH([256])
+ FIRST_SECTOR_ID([1]))
+LEGACY_FLOPPY_OPTIONS_END