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-rw-r--r--trunk/src/lib/formats/d88_dsk.c378
1 files changed, 378 insertions, 0 deletions
diff --git a/trunk/src/lib/formats/d88_dsk.c b/trunk/src/lib/formats/d88_dsk.c
new file mode 100644
index 00000000000..6c58c5bb7e1
--- /dev/null
+++ b/trunk/src/lib/formats/d88_dsk.c
@@ -0,0 +1,378 @@
+/*
+ * D77 and D88 disk images
+ *
+ *
+ * Header (total size = 0x2b0 bytes):
+ * 0x00 - Disk label
+ * 0x1a - Write protect (bit 3)
+ * 0x1b - 2D/2DD format (bit 3)
+ * 0x1c-1f - image size (should match file size)
+ * 0x20 - offsets for each track (max 164)
+ *
+ * Sectors (0x110 bytes each, typically)
+ * 0x00 - Sector info
+ * byte 0 - track number
+ * byte 1 - side (0 or 1)
+ * byte 2 - sector number
+ * 0x10 - sector data
+ *
+ * Images can be concatenated together.
+ * Sectors can be in any order.
+ * Tracks are in the order:
+ * Track 0 side 0
+ * Track 0 side 1
+ * Track 1 side 0
+ * ...
+ *
+ *
+ */
+
+#include "flopimg.h"
+#include "imageutl.h"
+
+#define D88_HEADER_LEN 0x2b0
+
+struct d88_tag
+{
+ UINT32 image_size;
+ UINT32 trackoffset[164];
+ UINT8 write_protect;
+ UINT8 disk_type;
+ UINT8 heads;
+};
+
+static struct d88_tag *get_d88_tag(floppy_image_legacy *floppy)
+{
+ return (d88_tag *)floppy_tag(floppy);
+}
+
+static int d88_get_sector_id(floppy_image_legacy *floppy, int head, int track, int sector_index)
+{
+ struct d88_tag* tag = get_d88_tag(floppy);
+ UINT32 offset;
+ UINT8 sector_hdr[16];
+ int x;
+
+ offset = tag->trackoffset[(track*tag->heads)+head];
+
+ if(offset == 0)
+ return 0;
+
+ floppy_image_read(floppy,sector_hdr,offset,16);
+
+ // get to sector indexed
+ x=0;
+ while(x<sector_index)
+ {
+ offset += ((sector_hdr[15] << 8) | sector_hdr[14]);
+ offset += 16;
+ floppy_image_read(floppy,sector_hdr,offset,16);
+ x++;
+ }
+
+ return sector_hdr[2];
+}
+
+static int d88_get_tracks_per_disk(floppy_image_legacy *floppy)
+{
+ return 82; // 82 tracks per side
+}
+
+static int d88_get_heads_per_disk(floppy_image_legacy *floppy)
+{
+ struct d88_tag* tag = get_d88_tag(floppy);
+ return tag->heads;
+}
+
+static int d88_get_sectors_per_track(floppy_image_legacy *floppy, int head, int track)
+{
+ struct d88_tag* tag = get_d88_tag(floppy);
+ UINT32 offset;
+ UINT8 sector_hdr[16];
+
+ offset = tag->trackoffset[(track*tag->heads)+head];
+
+ floppy_image_read(floppy,sector_hdr,offset,16);
+
+ return sector_hdr[4];
+}
+
+static floperr_t d88_get_sector_length(floppy_image_legacy *floppy, int head, int track, int sector, UINT32 *sector_length)
+{
+ struct d88_tag* tag = get_d88_tag(floppy);
+ UINT32 offset;
+ UINT8 sector_hdr[16];
+ UINT32 len;
+ int count,secs;
+
+ offset = tag->trackoffset[(track*tag->heads)+head];
+
+ floppy_image_read(floppy,sector_hdr,offset,16);
+ secs = sector_hdr[4];
+
+ for(count=0;count<secs;count++)
+ {
+ floppy_image_read(floppy,sector_hdr,offset,16);
+ if(sector == sector_hdr[2])
+ {
+ if(sector_length)
+ *sector_length = (sector_hdr[15] << 8) | sector_hdr[14];
+ return FLOPPY_ERROR_SUCCESS;
+ }
+ len = (sector_hdr[15] << 8) | sector_hdr[14];
+ len += 16;
+ offset += len;
+ }
+
+ return FLOPPY_ERROR_SEEKERROR;
+}
+
+static floperr_t d88_read_track(floppy_image_legacy *floppy, int head, int track, UINT64 offset, void *buffer, size_t buflen)
+{
+// floperr_t err;
+
+ return FLOPPY_ERROR_UNSUPPORTED;
+}
+
+static UINT32 d88_get_sector_offset(floppy_image_legacy* floppy, int head, int track, int sector)
+{
+ struct d88_tag* tag = get_d88_tag(floppy);
+ UINT32 offset = 0;
+ UINT8 sector_hdr[16];
+ UINT32 len;
+ UINT32 secs;
+ int count;
+
+ // get offset of the beginning of the track
+ offset = tag->trackoffset[(track*tag->heads)+head];
+
+ floppy_image_read(floppy,sector_hdr,offset,16);
+ secs = sector_hdr[4];
+
+ for(count=0;count<secs;count++)
+ {
+ floppy_image_read(floppy,sector_hdr,offset,16);
+ if(sector == sector_hdr[2])
+ {
+ LOG_FORMATS("d88_get_sector_offset - track %i, side %i, sector %02x, returns %08x\n",track,head,sector,offset+16);
+ return offset + 16;
+ }
+ len = (sector_hdr[15] << 8) | sector_hdr[14];
+ len += 16;
+ offset += len;
+ }
+ LOG_FORMATS("d88_get_sector_offset - track %i, side %i, sector %02x, not found\n",track,head,sector);
+ return 0;
+}
+
+static floperr_t d88_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)
+{
+ struct d88_tag* tag = get_d88_tag(floppy);
+ UINT32 offset;
+ UINT8 sector_hdr[16];
+ int x;
+
+ offset = tag->trackoffset[(track*tag->heads)+head];
+
+ if(offset == 0)
+ return FLOPPY_ERROR_SEEKERROR;
+
+
+ floppy_image_read(floppy,sector_hdr,offset,16);
+
+ if(sector_index >= sector_hdr[4])
+ return FLOPPY_ERROR_SEEKERROR;
+
+ // get to sector indexed
+ x=0;
+ while(x<sector_index)
+ {
+ offset += ((sector_hdr[15] << 8) | sector_hdr[14]);
+ offset += 16;
+ floppy_image_read(floppy,sector_hdr,offset,16);
+ x++;
+ }
+
+ if(offset > tag->image_size || offset == 0)
+ return FLOPPY_ERROR_SEEKERROR;
+
+ if(sector_length)
+ *sector_length = (sector_hdr[15] << 8) | sector_hdr[14];
+ if(cylinder)
+ *cylinder = sector_hdr[0];
+ if(side)
+ *side = sector_hdr[1];
+ if(sector)
+ *sector = sector_hdr[2];
+ if(flags)
+ *flags = 0;
+
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+static floperr_t d88_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
+{
+ UINT64 offset;
+ UINT32 sector_length;
+
+ offset = d88_get_sector_offset(floppy,head,track,sector);
+
+ if(d88_get_sector_length(floppy,head,track,sector,&sector_length) != FLOPPY_ERROR_SUCCESS)
+ return FLOPPY_ERROR_SEEKERROR;
+
+ if(offset == 0)
+ return FLOPPY_ERROR_SEEKERROR;
+
+ if(buflen > sector_length)
+ return FLOPPY_ERROR_INTERNAL;
+
+ floppy_image_read(floppy,buffer,offset,sector_length);
+
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+static floperr_t d88_read_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buffer_len)
+{
+ int sec;
+
+ sec = d88_get_sector_id(floppy,head,track,sector);
+ return d88_read_sector(floppy,head,track,sec,buffer,buffer_len);
+}
+
+static floperr_t d88_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
+{
+ UINT64 offset;
+ UINT32 sector_length;
+
+ offset = d88_get_sector_offset(floppy,head,track,sector);
+
+ if(d88_get_sector_length(floppy,head,track,sector,&sector_length) != FLOPPY_ERROR_SUCCESS)
+ return FLOPPY_ERROR_SEEKERROR;
+
+ if(offset == 0)
+ return FLOPPY_ERROR_SEEKERROR;
+
+ if(buflen > sector_length)
+ return FLOPPY_ERROR_INTERNAL;
+
+ floppy_image_write(floppy,buffer,offset,sector_length);
+
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+static floperr_t d88_write_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
+{
+ int sec;
+
+ sec = d88_get_sector_id(floppy,head,track,sector);
+ return d88_write_sector(floppy,head,track,sec,buffer,buflen,ddam);
+}
+
+static void d88_get_header(floppy_image_legacy* floppy,UINT32* size, UINT8* prot, UINT8* type, UINT32* offsets)
+{
+ UINT8 header[D88_HEADER_LEN];
+ int x,s;
+
+ floppy_image_read(floppy,header,0,D88_HEADER_LEN);
+
+#ifdef SPOT_DUPLICATES
+ // there exist many .d88 files with same data and different headers and
+ // this allows to spot duplicates, making easier to debug softlists.
+ UINT32 temp_size = floppy_image_size(floppy);
+ UINT8 tmp_copy[temp_size - D88_HEADER_LEN];
+ floppy_image_read(floppy,tmp_copy,D88_HEADER_LEN,temp_size - D88_HEADER_LEN);
+ printf("CRC16: %d\n", ccitt_crc16(0xffff, tmp_copy, temp_size - D88_HEADER_LEN));
+#endif
+
+ if(prot)
+ *prot = header[0x1a];
+ if(type)
+ *type = header[0x1b];
+ if(size)
+ {
+ s = 0;
+ s |= header[0x1f] << 24;
+ s |= header[0x1e] << 16;
+ s |= header[0x1d] << 8;
+ s |= header[0x1c];
+ *size = s;
+ }
+ if(offsets)
+ {
+ for(x=0;x<164;x++)
+ {
+ s = 0;
+ s |= header[0x23 + (x*4)] << 24;
+ s |= header[0x22 + (x*4)] << 16;
+ s |= header[0x21 + (x*4)] << 8;
+ s |= header[0x20 + (x*4)];
+ *(offsets+x) = s;
+ }
+ }
+}
+
+FLOPPY_IDENTIFY(d88_dsk_identify)
+{
+ UINT32 size;
+
+ d88_get_header(floppy,&size,NULL,NULL,NULL);
+
+ if(floppy_image_size(floppy) == size)
+ {
+ *vote = 100;
+ }
+ else
+ {
+ *vote = 0;
+ }
+ return FLOPPY_ERROR_SUCCESS;
+}
+
+FLOPPY_CONSTRUCT(d88_dsk_construct)
+{
+ struct FloppyCallbacks *callbacks;
+ struct d88_tag *tag;
+ UINT32 size;
+ UINT8 prot,type = 0;
+ UINT32 offs[164];
+ int x;
+
+ if(params)
+ {
+ // create
+ return FLOPPY_ERROR_UNSUPPORTED;
+ }
+ else
+ {
+ // load
+ d88_get_header(floppy,&size,&prot,&type,offs);
+ }
+
+ tag = (d88_tag *)floppy_create_tag(floppy,sizeof(struct d88_tag));
+ if (!tag)
+ return FLOPPY_ERROR_OUTOFMEMORY;
+
+ tag->write_protect = prot;
+ tag->disk_type = type;
+ tag->heads = 2;
+ if (tag->disk_type==0x30 || tag->disk_type==0x40) tag->heads = 1;
+
+ tag->image_size = size;
+ for(x=0;x<164;x++)
+ tag->trackoffset[x] = offs[x];
+
+ callbacks = floppy_callbacks(floppy);
+ callbacks->read_track = d88_read_track;
+ callbacks->get_heads_per_disk = d88_get_heads_per_disk;
+ callbacks->get_tracks_per_disk = d88_get_tracks_per_disk;
+ callbacks->get_sector_length = d88_get_sector_length;
+ callbacks->read_sector = d88_read_sector;
+ callbacks->read_indexed_sector = d88_read_indexed_sector;
+ callbacks->write_sector = d88_write_sector;
+ callbacks->write_indexed_sector = d88_write_indexed_sector;
+ callbacks->get_indexed_sector_info = d88_get_indexed_sector_info;
+ callbacks->get_sectors_per_track = d88_get_sectors_per_track;
+
+
+ return FLOPPY_ERROR_SUCCESS;
+}