diff options
Diffstat (limited to 'trunk/src/lib/formats/imd_dsk.c')
-rw-r--r-- | trunk/src/lib/formats/imd_dsk.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/trunk/src/lib/formats/imd_dsk.c b/trunk/src/lib/formats/imd_dsk.c new file mode 100644 index 00000000000..5ae14faad92 --- /dev/null +++ b/trunk/src/lib/formats/imd_dsk.c @@ -0,0 +1,275 @@ +/********************************************************************* + + formats/imd_dsk.c + + IMD disk images + +*********************************************************************/ + +#include <string.h> +#include "flopimg.h" + +struct imddsk_tag +{ + int heads; + int tracks; + int sector_size; + UINT64 track_offsets[84*2]; /* offset within data for each track */ +}; + + +static struct imddsk_tag *get_tag(floppy_image_legacy *floppy) +{ + struct imddsk_tag *tag; + tag = (imddsk_tag *)floppy_tag(floppy); + return tag; +} + + + +FLOPPY_IDENTIFY( imd_dsk_identify ) +{ + UINT8 header[3]; + + floppy_image_read(floppy, header, 0, 3); + if (header[0]=='I' && header[1]=='M' && header[2]=='D') { + *vote = 100; + } else { + *vote = 0; + } + return FLOPPY_ERROR_SUCCESS; +} + +static int imd_get_heads_per_disk(floppy_image_legacy *floppy) +{ + return get_tag(floppy)->heads; +} + +static int imd_get_tracks_per_disk(floppy_image_legacy *floppy) +{ + return get_tag(floppy)->tracks; +} + +static UINT64 imd_get_track_offset(floppy_image_legacy *floppy, int head, int track) +{ + return get_tag(floppy)->track_offsets[(track<<1) + head]; +} + +static floperr_t get_offset(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, UINT64 *offset) +{ + UINT64 offs = 0; + UINT8 header[5]; + UINT8 sector_num; + int i; + + + if ((head < 0) || (head >= get_tag(floppy)->heads) || (track < 0) || (track >= get_tag(floppy)->tracks) + || (sector < 0) ) + return FLOPPY_ERROR_SEEKERROR; + + offs = imd_get_track_offset(floppy,head,track); + floppy_image_read(floppy, header, offs, 5); + + sector_num = header[3]; + offs += 5 + sector_num; // skip header and sector numbering map + if(header[2] & 0x80) offs += sector_num; // skip cylinder numbering map + if(header[2] & 0x40) offs += sector_num; // skip head numbering map + get_tag(floppy)->sector_size = 1 << (header[4] + 7); + for(i=0;i<sector;i++) { + floppy_image_read(floppy, header, offs, 1); // take sector data type + switch(header[0]) { + case 0: offs++; break; + case 1: + case 3: + case 5: + case 7: offs += get_tag(floppy)->sector_size + 1; break; + default: offs += 2; + } + } + if (offset) + *offset = offs; + return FLOPPY_ERROR_SUCCESS; +} + + + +static floperr_t internal_imd_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; + UINT8 header[1]; + + // take sector offset + err = get_offset(floppy, head, track, sector, sector_is_index, &offset); + if (err) + return err; + + floppy_image_read(floppy, header, offset, 1); + switch(header[0]) { + case 0: break; + case 1: + case 3: + case 5: + case 7: + floppy_image_read(floppy, buffer, offset+1, buflen); + break; + + default: // all data same + floppy_image_read(floppy, header, offset+1, 1); + memset(buffer,header[0],buflen); + break; + } + + return FLOPPY_ERROR_SUCCESS; +} + + +static floperr_t imd_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen) +{ + return internal_imd_read_sector(floppy, head, track, sector, FALSE, buffer, buflen); +} + +static floperr_t imd_read_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen) +{ + return internal_imd_read_sector(floppy, head, track, sector, TRUE, buffer, buflen); +} + +static floperr_t imd_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 = get_tag(floppy)->sector_size; + } + return FLOPPY_ERROR_SUCCESS; +} + +static floperr_t imd_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) +{ + UINT64 offset; + UINT8 header[5]; + UINT8 hd; + UINT8 tr; + UINT32 sector_size; + UINT8 sector_num; + + offset = imd_get_track_offset(floppy,head,track); + floppy_image_read(floppy, header, offset, 5); + tr = header[1]; + hd = header[2]; + sector_num = header[3]; + sector_size = 1 << (header[4] + 7); + if (sector_index >= sector_num) return FLOPPY_ERROR_SEEKERROR; + if (cylinder) { + if (head & 0x80) { + floppy_image_read(floppy, header, offset + 5 + sector_num+ sector_index, 1); + *cylinder = header[0]; + } else { + *cylinder = tr; + } + } + if (side) { + if (head & 0x40) { + if (head & 0x80) { + floppy_image_read(floppy, header, offset + 5 + 2 * sector_num+sector_index, 1); + } else { + floppy_image_read(floppy, header, offset + 5 + sector_num+sector_index, 1); + } + *side = header[0]; + } else { + *side = hd & 1; + } + } + if (sector) { + floppy_image_read(floppy, header, offset + 5 + sector_index, 1); + *sector = header[0]; + } + if (sector_length) { + *sector_length = sector_size; + } + if (flags) { + UINT8 skip; + if (head & 0x40) { + if (head & 0x80) { + skip = 3; + } else { + skip = 2; + } + } else { + skip = 1; + } + floppy_image_read(floppy, header, offset + 5 + skip * sector_num, 1); + *flags = 0; + if ((header[0]-1) & 0x02) *flags |= ID_FLAG_DELETED_DATA; + if ((header[0]-1) & 0x04) *flags |= ID_FLAG_CRC_ERROR_IN_DATA_FIELD; + } + return FLOPPY_ERROR_SUCCESS; +} + + +FLOPPY_CONSTRUCT( imd_dsk_construct ) +{ + struct FloppyCallbacks *callbacks; + struct imddsk_tag *tag; + UINT8 header[0x100]; + UINT64 pos = 0; + int sector_size = 0; + int sector_num; + int i; + if(params) + { + // create + return FLOPPY_ERROR_UNSUPPORTED; + } + + tag = (struct imddsk_tag *) floppy_create_tag(floppy, sizeof(struct imddsk_tag)); + if (!tag) + return FLOPPY_ERROR_OUTOFMEMORY; + + floppy_image_read(floppy, header, pos, 1); + while(header[0]!=0x1a) { + pos++; + floppy_image_read(floppy, header, pos, 1); + } + pos++; + tag->tracks = 0; + tag->heads = 1; + do { + floppy_image_read(floppy, header, pos, 5); + if ((header[2] & 1)==1) tag->heads = 2; + tag->track_offsets[(header[1]<<1) + (header[2] & 1)] = pos; + sector_num = header[3]; + pos += 5 + sector_num; // skip header and sector numbering map + if(header[2] & 0x80) pos += sector_num; // skip cylinder numbering map + if(header[2] & 0x40) pos += sector_num; // skip head numbering map + sector_size = 1 << (header[4] + 7); + for(i=0;i<sector_num;i++) { + floppy_image_read(floppy, header, pos, 1); // take sector data type + switch(header[0]) { + case 0: pos++; break; + case 1: + case 3: + case 5: + case 7: pos += sector_size + 1; break; + default: pos += 2;break; + } + } + tag->tracks += 1; + } while(pos < floppy_image_size(floppy)); + if (tag->heads==2) { + tag->tracks = tag->tracks / 2; + } + callbacks = floppy_callbacks(floppy); + callbacks->read_sector = imd_read_sector; + callbacks->read_indexed_sector = imd_read_indexed_sector; + callbacks->get_sector_length = imd_get_sector_length; + callbacks->get_heads_per_disk = imd_get_heads_per_disk; + callbacks->get_tracks_per_disk = imd_get_tracks_per_disk; + callbacks->get_indexed_sector_info = imd_get_indexed_sector_info; + + return FLOPPY_ERROR_SUCCESS; +} + |