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https://github.com/holub/mame
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391 lines
10 KiB
C
391 lines
10 KiB
C
/*********************************************************************
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formats/thom_dsk.c
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Thomson disk images
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Based on work of Antoine Mine'
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*********************************************************************/
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#include <string.h>
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#include "thom_dsk.h"
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#include "basicdsk.h"
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static const int sap_magic_num = 0xB3; /* simple XOR crypt */
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static const char sap_header[] =
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"\001SYSTEME D'ARCHIVAGE PUKALL S.A.P. "
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"(c) Alexandre PUKALL Avril 1998";
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static const UINT16 sap_crc[] =
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{
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0x0000, 0x1081, 0x2102, 0x3183, 0x4204, 0x5285, 0x6306, 0x7387,
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0x8408, 0x9489, 0xa50a, 0xb58b, 0xc60c, 0xd68d, 0xe70e, 0xf78f,
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};
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struct sap_dsk_tag
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{
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int tracks;
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int sector_size;
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int sector_pos[80][16]; /* remember sector position in file */
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};
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static UINT16 thom_sap_crc( UINT8* data, int size )
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{
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int i;
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UINT16 crc = 0xffff, crc2;
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for ( i = 0; i < size; i++ )
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{
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crc2 = ( crc >> 4 ) ^ sap_crc[ ( crc ^ data[i] ) & 15 ];
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crc = ( crc2 >> 4 ) ^ sap_crc[ ( crc2 ^ (data[i] >> 4) ) & 15 ];
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}
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return crc;
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}
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static struct sap_dsk_tag *get_tag(floppy_image_legacy *floppy)
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{
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struct sap_dsk_tag *tag;
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tag = (sap_dsk_tag *)floppy_tag(floppy);
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return tag;
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}
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static FLOPPY_IDENTIFY(sap_dsk_identify)
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{
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char header[0x100];
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floppy_image_read(floppy, header, 0, sizeof(sap_header));
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if (!memcmp( header, sap_header, sizeof(sap_header) ) )
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{
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*vote= 100;
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} else {
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*vote = 0;
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}
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return FLOPPY_ERROR_SUCCESS;
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}
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static int sap_get_heads_per_disk(floppy_image_legacy *floppy)
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{
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return 1;
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}
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static int sap_get_tracks_per_disk(floppy_image_legacy *floppy)
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{
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return get_tag(floppy)->tracks;
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}
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static floperr_t get_offset(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, UINT64 *offset)
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{
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UINT64 offs;
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struct sap_dsk_tag *tag = get_tag(floppy);
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/* translate the sector to a raw sector */
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if (!sector_is_index)
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{
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sector -= 1;
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}
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/* check to see if we are out of range */
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if ((head < 0) || (head >= 1) || (track < 0) || (track >=tag->tracks)
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|| (sector < 0) || (sector >= 16))
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return FLOPPY_ERROR_SEEKERROR;
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offs = tag->sector_pos[track][sector];
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if (offs <= 0 )
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return FLOPPY_ERROR_SEEKERROR;
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if (offset)
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*offset = offs;
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return FLOPPY_ERROR_SUCCESS;
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}
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static floperr_t internal_sap_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, void *buffer, size_t buflen)
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{
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UINT64 offset;
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floperr_t err;
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int i;
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UINT8 *buf;
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err = get_offset(floppy, head, track, sector, sector_is_index, &offset);
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if (err)
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return err;
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floppy_image_read(floppy, buffer, offset+4, buflen);
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buf = (UINT8*)buffer;
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for (i=0;i<buflen;i++) {
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buf[i] ^= sap_magic_num;
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}
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return FLOPPY_ERROR_SUCCESS;
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}
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static floperr_t internal_sap_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, const void *buffer, size_t buflen, int ddam)
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{
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UINT64 offset;
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floperr_t err;
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UINT8 buf[256+6];
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UINT16 crc;
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int i;
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err = get_offset(floppy, head, track, sector, sector_is_index, &offset);
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if (err)
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return err;
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/* buf = 4-byte header + sector + 2-byte CRC */
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floppy_image_read(floppy, buf, offset, 4);
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for (i=0;i<buflen;i++) {
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buf[i+4] = ((UINT8*)buffer)[i];
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}
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crc = thom_sap_crc( buf, buflen+4 );
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buf[buflen+4] = crc >> 8;
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buf[buflen+5] = crc & 0xff;
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for (i=0;i<buflen;i++) {
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buf[i+4] ^= sap_magic_num;
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}
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floppy_image_write(floppy, buf, offset, buflen+6);
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return FLOPPY_ERROR_SUCCESS;
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}
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static floperr_t sap_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
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{
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return internal_sap_read_sector(floppy, head, track, sector, FALSE, buffer, buflen);
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}
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static floperr_t sap_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
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{
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return internal_sap_write_sector(floppy, head, track, sector, FALSE, buffer, buflen, ddam);
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}
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static floperr_t sap_read_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
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{
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return internal_sap_read_sector(floppy, head, track, sector, TRUE, buffer, buflen);
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}
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static floperr_t sap_write_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
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{
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return internal_sap_write_sector(floppy, head, track, sector, TRUE, buffer, buflen, ddam);
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}
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static floperr_t sap_get_sector_length(floppy_image_legacy *floppy, int head, int track, int sector, UINT32 *sector_length)
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{
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floperr_t err;
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err = get_offset(floppy, head, track, sector, FALSE, NULL);
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if (err)
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return err;
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if (sector_length) {
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*sector_length = get_tag(floppy)->sector_size;
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}
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return FLOPPY_ERROR_SUCCESS;
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}
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static floperr_t sap_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)
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{
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floperr_t err;
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UINT8 header[4];
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UINT64 offset = 0;
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sector_index += 1;
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err = get_offset(floppy, head, track, sector_index, FALSE, &offset);
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floppy_image_read(floppy, header, offset, 4);
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if (cylinder)
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*cylinder = header[2];
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if (side)
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*side = head;
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if (sector)
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*sector = header[3];
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if (sector_length)
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*sector_length = get_tag(floppy)->sector_size;
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if (flags)
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/* TODO: read DAM or DDAM and determine flags */
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*flags = 0;
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return err;
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}
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static floperr_t sap_post_format(floppy_image_legacy *floppy, option_resolution *params)
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{
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int track,sector;
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int pos;
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UINT8 buf[256], header[4];
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struct sap_dsk_tag *tag;
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tag = (struct sap_dsk_tag *) floppy_create_tag(floppy, sizeof(struct sap_dsk_tag));
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/* default options */
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if ( !tag->tracks )
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{
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tag->tracks = 80;
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tag->sector_size = 256;
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}
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/* create SAP file header */
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floppy_image_write( floppy, sap_header, 0, 66 );
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for ( track = 0; track < 80; track++ )
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for ( sector = 0; sector < 16; sector++ )
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tag->sector_pos[track][sector] = 0;
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/* create all sectors with valid header and CRC */
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memset(buf, 0xe5, 256);
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pos = 0x42;
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header[0] = (tag->sector_size==128) ? 1 : 0;
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header[1] = 0;
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for ( track = 0, pos = 0x42; track < tag->tracks; track++ )
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for ( sector = 0; sector < 16; sector++, pos += tag->sector_size + 6 ) {
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tag->sector_pos[track][sector] = pos;
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header[2] = track;
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header[3] = sector + 1;
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floppy_image_write(floppy, header, pos, 4);
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sap_write_indexed_sector( floppy, 0, track, sector, buf, tag->sector_size, 0 );
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}
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return FLOPPY_ERROR_SUCCESS;
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}
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static FLOPPY_CONSTRUCT(sap_dsk_construct)
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{
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struct FloppyCallbacks *callbacks;
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struct sap_dsk_tag *tag;
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int j;
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UINT8 fmt;
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tag = (struct sap_dsk_tag *) floppy_create_tag(floppy, sizeof(struct sap_dsk_tag));
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if (!tag)
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return FLOPPY_ERROR_OUTOFMEMORY;
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/* guess format */
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floppy_image_read(floppy, &fmt, 0x42, 1);
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if ( fmt==1 ) tag->sector_size = 128; else tag->sector_size = 256;
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/* start with an empty offset table */
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tag->tracks = 0;
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for ( int i = 0; i < 80; i++ )
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for ( j = 0; j < 16; j++ )
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tag->sector_pos[i][j] = 0;
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/* count tracks & fill sector offset table */
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for ( UINT64 i = 0x42; i+4 < floppy_image_size(floppy); i += tag->sector_size + 6 ) // CRC 2 bytes + 4 bytes sector header
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{
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UINT8 sector, track;
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floppy_image_read(floppy, &track, i+2, 1);
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floppy_image_read(floppy, §or, i+3, 1);
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if ( track >= 80 || sector < 1 || sector > 16 ) continue;
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if ( track > tag->tracks ) tag->tracks = track+1;
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tag->sector_pos[track][sector-1] = i;
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}
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callbacks = floppy_callbacks(floppy);
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callbacks->read_sector = sap_read_sector;
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callbacks->write_sector = sap_write_sector;
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callbacks->read_indexed_sector = sap_read_indexed_sector;
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callbacks->write_indexed_sector = sap_write_indexed_sector;
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callbacks->get_sector_length = sap_get_sector_length;
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callbacks->get_heads_per_disk = sap_get_heads_per_disk;
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callbacks->get_tracks_per_disk = sap_get_tracks_per_disk;
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callbacks->get_indexed_sector_info = sap_get_indexed_sector_info;
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callbacks->post_format = sap_post_format;
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return FLOPPY_ERROR_SUCCESS;
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}
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static FLOPPY_IDENTIFY(qdd_dsk_identify)
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{
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*vote = (floppy_image_size(floppy) == (51200)) ? 100 : 0;
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return FLOPPY_ERROR_SUCCESS;
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}
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/* fixed interlacing map for QDDs */
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static int thom_qdd_map[400];
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static int qdd_translate_sector(floppy_image_legacy *floppy, int sector)
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{
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return thom_qdd_map[sector-1];
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}
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static void thom_qdd_compute_map ( void )
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{
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/* this map is hardcoded in the QDD BIOS */
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static const int p[6][4] =
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{
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{ 20, 2, 14, 8 }, { 21, 19, 13, 7 },
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{ 22, 18, 12, 6 }, { 23, 17, 11, 5 },
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{ 24, 16, 10, 4 }, { 1, 15, 9, 3 }
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};
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static const int q[4] = { 0, 8, 4, 12 };
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int t, s;
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for ( t = 0; t < 24; t++ )
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{
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for ( s = 0; s < 16; s++ )
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{
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thom_qdd_map[ t*16 + s ] = p[ t/4 ][ s%4 ] * 16 + (s/4) + 4*(t%4);
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}
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}
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for ( s = 0; s < 16; s++ )
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{
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thom_qdd_map[ 24*16 + s ] = q[ s%4 ] + (s/4);
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}
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}
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static FLOPPY_CONSTRUCT(qdd_dsk_construct)
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{
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struct basicdsk_geometry geometry;
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thom_qdd_compute_map();
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memset(&geometry, 0, sizeof(geometry));
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geometry.heads = 1;
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geometry.first_sector_id = 1;
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geometry.sector_length = 128;
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geometry.tracks = 1;
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geometry.sectors = 400;
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geometry.translate_sector = qdd_translate_sector;
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return basicdsk_construct(floppy, &geometry);
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}
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/* ----------------------------------------------------------------------- */
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LEGACY_FLOPPY_OPTIONS_START(thomson)
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LEGACY_FLOPPY_OPTION(fdmfm2, "fd", "Thomson FD (MFM) 80 tracks disk image (3\"1/2 DD)", basicdsk_identify_default, basicdsk_construct_default, NULL,
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HEADS([1])
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TRACKS([80])
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SECTORS([16])
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SECTOR_LENGTH([256])
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FIRST_SECTOR_ID([1]))
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LEGACY_FLOPPY_OPTION(fdmfm, "fd", "Thomson FD (MFM) 40 tracks disk image (5\"1/4 DD)", basicdsk_identify_default, basicdsk_construct_default, NULL,
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HEADS([1])
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TRACKS([40])
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SECTORS([16])
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SECTOR_LENGTH([256])
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FIRST_SECTOR_ID([1]))
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LEGACY_FLOPPY_OPTION(fd2, "fd", "Thomson FD (FM) 80 tracks disk image (3\"1/2 SD)", basicdsk_identify_default, basicdsk_construct_default, NULL,
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HEADS([1])
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TRACKS([80])
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SECTORS([16])
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SECTOR_LENGTH([128])
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FIRST_SECTOR_ID([1]))
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LEGACY_FLOPPY_OPTION(fd, "fd", "Thomson FD (FM) 40 tracks disk image (5\"1/4 SD)", basicdsk_identify_default, basicdsk_construct_default, NULL,
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HEADS([1])
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TRACKS([40])
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SECTORS([16])
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SECTOR_LENGTH([128])
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FIRST_SECTOR_ID([1]))
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LEGACY_FLOPPY_OPTION(sap,"sap", "Thomson SAP floppy disk image", sap_dsk_identify, sap_dsk_construct, NULL, NULL)
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LEGACY_FLOPPY_OPTION(qdd,"qd", "Thomson QDD floppy disk image (2\"8 SD)", qdd_dsk_identify, qdd_dsk_construct, NULL,
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HEADS([1])
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TRACKS([1])
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SECTORS([400])
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SECTOR_LENGTH([128])
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FIRST_SECTOR_ID([0]))
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LEGACY_FLOPPY_OPTIONS_END
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