diff options
Diffstat (limited to 'trunk/src/lib/formats/smx_dsk.c')
-rw-r--r-- | trunk/src/lib/formats/smx_dsk.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/trunk/src/lib/formats/smx_dsk.c b/trunk/src/lib/formats/smx_dsk.c new file mode 100644 index 00000000000..0e198c13f90 --- /dev/null +++ b/trunk/src/lib/formats/smx_dsk.c @@ -0,0 +1,159 @@ +/********************************************************************* + + formats/smx_dsk.c + + Specialist MX disk images + +*********************************************************************/ + +#include <string.h> + +#include "smx_dsk.h" +#include "basicdsk.h" + +static FLOPPY_IDENTIFY(smx_dsk_identify) +{ + *vote = (floppy_image_size(floppy) == 819200) ? 100 : 0; + return FLOPPY_ERROR_SUCCESS; +} + +static int smx_get_heads_per_disk(floppy_image_legacy *floppy) +{ + return 2; +} + +static int smx_get_tracks_per_disk(floppy_image_legacy *floppy) +{ + return 80; +} + +static UINT64 smx_translate_offset(floppy_image_legacy *floppy, + int track, int head, int sector) +{ + return (track * 1024 * 5 * 2) + (head * 1024 * 5) + 1024 * sector; +} + +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 >= 2) || (track < 0) || (track >= 80) + || (sector < 0) || (sector >= 6)) + return FLOPPY_ERROR_SEEKERROR; + + offs = smx_translate_offset(floppy, track, head, sector); + if (offset) + *offset = offs; + return FLOPPY_ERROR_SUCCESS; +} + + + +static floperr_t internal_smx_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_smx_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 smx_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen) +{ + return internal_smx_read_sector(floppy, head, track, sector, FALSE, buffer, buflen); +} + +static floperr_t smx_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam) +{ + return internal_smx_write_sector(floppy, head, track, sector, FALSE, buffer, buflen, ddam); +} + +static floperr_t smx_read_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen) +{ + return internal_smx_read_sector(floppy, head, track, sector, TRUE, buffer, buflen); +} + +static floperr_t smx_write_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam) +{ + return internal_smx_write_sector(floppy, head, track, sector, TRUE, buffer, buflen, ddam); +} + +static floperr_t smx_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 = 1024; + } + return FLOPPY_ERROR_SUCCESS; +} + + + +static floperr_t smx_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 smx_get_sector_length(floppy, head, track, sector_index, sector_length); +} + + +static FLOPPY_CONSTRUCT(smx_dsk_construct) +{ + struct FloppyCallbacks *callbacks; + callbacks = floppy_callbacks(floppy); + callbacks->read_sector = smx_read_sector; + callbacks->write_sector = smx_write_sector; + callbacks->read_indexed_sector = smx_read_indexed_sector; + callbacks->write_indexed_sector = smx_write_indexed_sector; + callbacks->get_sector_length = smx_get_sector_length; + callbacks->get_heads_per_disk = smx_get_heads_per_disk; + callbacks->get_tracks_per_disk = smx_get_tracks_per_disk; + callbacks->get_indexed_sector_info = smx_get_indexed_sector_info; + + return FLOPPY_ERROR_SUCCESS; +} + + + +/* ----------------------------------------------------------------------- */ + +LEGACY_FLOPPY_OPTIONS_START( specimx ) + LEGACY_FLOPPY_OPTION( smx_dsk, "odi", "Specialist MX floppy disk image", smx_dsk_identify, smx_dsk_construct, NULL, NULL) +LEGACY_FLOPPY_OPTIONS_END |