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https://github.com/holub/mame
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Sync with MESS. (nw)
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Curt Coder
parent
eecf68e680
commit
b3cb644955
@ -4,30 +4,31 @@
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Floppy format code for Commodore 1541 GCR disk images
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http://www.unusedino.de/ec64/technical/formats/g64.html
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*********************************************************************/
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/*
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TODO:
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- speed zones
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- writing
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- write to disk
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*/
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#define XTAL_16MHz 16000000
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#define XTAL_12MHz 12000000
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#include "g64_dsk.h"
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#include "flopimg.h"
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#include "imageutl.h"
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/***************************************************************************
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PARAMETERS
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***************************************************************************/
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#define LOG 0
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#define HEADER_LENGTH 0x2ac /* standard length for 84 half tracks */
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#define MAX_TRACKS 84
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#define HEADER_LENGTH 0x2ac // standard length for 84 half tracks
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#define MAX_TRACKS 84
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/***************************************************************************
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TYPE DEFINITIONS
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@ -36,11 +37,11 @@
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struct g64dsk_tag
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{
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int version;
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int heads; /* number of physical heads */
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int tracks; /* number of physical tracks */
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UINT16 track_size; /* size of each track */
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UINT32 track_offset[MAX_TRACKS]; /* offset within data for each track */
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UINT32 speed_zone_offset[MAX_TRACKS]; /* offset within data for each track */
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int heads; // number of physical heads
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int tracks; // number of physical tracks
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UINT16 track_size[MAX_TRACKS]; // size of each track
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UINT32 track_offset[MAX_TRACKS]; // offset within data for each track
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UINT32 speed_zone_offset[MAX_TRACKS]; // offset within data for each track
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};
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/***************************************************************************
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@ -108,17 +109,21 @@ static floperr_t get_track_offset(floppy_image_legacy *floppy, int head, int tra
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static UINT32 g64_get_track_size(floppy_image_legacy *floppy, int head, int track)
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{
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/* get track offset */
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// get track offset
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UINT32 track_length = 0;
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UINT64 track_offset;
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floperr_t err = get_track_offset(floppy, head, track, &track_offset);
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if (err)
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return 0;
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/* read track length */
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UINT8 size[2];
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floppy_image_read(floppy, &size, track_offset, 2);
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UINT32 track_length = (size[1] << 8) | size[0];
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// read track length
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if (track_offset > 0)
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{
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UINT8 size[2];
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floppy_image_read(floppy, &size, track_offset, 2);
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track_length = pick_integer_le(size, 0, 2);
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}
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return track_length;
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}
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@ -130,12 +135,23 @@ static UINT32 g64_get_track_size(floppy_image_legacy *floppy, int head, int trac
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static floperr_t g64_read_track(floppy_image_legacy *floppy, int head, int track, UINT64 offset, void *buffer, size_t buflen)
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{
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/*
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The following is written into the buffer:
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n bytes of track data
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1982 bytes of speed zone data
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get_track_size() returns n (size of track data)
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*/
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struct g64dsk_tag *tag = get_tag(floppy);
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floperr_t err;
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UINT64 track_offset;
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UINT16 track_length = 0;
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UINT16 track_length = tag->track_size[track];
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/* get track offset */
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// get track offset
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err = get_track_offset(floppy, head, track, &track_offset);
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if (err)
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@ -143,18 +159,32 @@ static floperr_t g64_read_track(floppy_image_legacy *floppy, int head, int track
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if (!head && track_offset)
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{
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if (buflen < tag->track_size) { printf("G64 track buffer too small: %u!", (UINT32)buflen); exit(-1); }
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if (buflen < track_length) { printf("G64 track buffer too small: %u < %u!", (UINT32)buflen, track_length); exit(-1); }
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/* read track */
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floppy_image_read(floppy, buffer, track_offset + 2, tag->track_size);
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// read track data
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floppy_image_read(floppy, ((UINT8*)buffer), track_offset + 2, track_length); // skip the 2 track length bytes in the beginning of track data
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if (tag->speed_zone_offset[track] > 3)
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{
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// read speed block
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floppy_image_read(floppy, ((UINT8*)buffer) + track_length, tag->speed_zone_offset[track], G64_SPEED_BLOCK_SIZE);
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}
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else
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{
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// create a speed block with the same speed zone for the whole track
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UINT8 speed = tag->speed_zone_offset[track] & 0x03;
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UINT8 speed_byte = (speed << 6) | (speed << 4) | (speed << 2) | speed;
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memset(((UINT8*)buffer) + track_length, speed_byte, G64_SPEED_BLOCK_SIZE);
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}
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}
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else
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{
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/* set track length to 0 */
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memset(buffer, 0, buflen);
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// no data for given track, or tried to read side 1
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memset(((UINT8*)buffer), 0, buflen);
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}
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if (LOG) LOG_FORMATS("G64 track %.1f length %u\n", get_dos_track(track), track_length);
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LOG_FORMATS("G64 track %.1f length %u\n", get_dos_track(track), track_length);
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return FLOPPY_ERROR_SUCCESS;
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}
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@ -231,12 +261,12 @@ FLOPPY_CONSTRUCT( g64_dsk_construct )
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struct FloppyCallbacks *callbacks;
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struct g64dsk_tag *tag;
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UINT8 header[HEADER_LENGTH];
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UINT64 pos = 0;
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UINT64 pos = 0xc;
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int i;
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if (params)
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{
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/* create not supported */
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// create not supported
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return FLOPPY_ERROR_UNSUPPORTED;
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}
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@ -244,46 +274,46 @@ FLOPPY_CONSTRUCT( g64_dsk_construct )
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if (!tag) return FLOPPY_ERROR_OUTOFMEMORY;
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/* version */
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floppy_image_read(floppy, header, pos, 0x0c); pos += 0xc;
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tag->version = header[8];
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if (LOG) LOG_FORMATS("G64 version: %u\n", tag->version);
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// read header
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floppy_image_read(floppy, header, 0, HEADER_LENGTH);
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/* number of half tracks */
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// get version
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tag->version = header[8];
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LOG_FORMATS("G64 version: %u\n", tag->version);
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// get number of tracks
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tag->heads = 1;
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tag->tracks = header[9];
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if (LOG) LOG_FORMATS("G64 tracks: %u\n", tag->tracks);
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LOG_FORMATS("G64 tracks: %u\n", tag->tracks);
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/* size of each stored half track */
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tag->track_size = (header[11] << 8) | header[10];
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if (LOG) LOG_FORMATS("G64 track size: %04x\n", tag->track_size);
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/* data offsets */
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// get data offsets
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for (i = 0; i < tag->tracks; i++)
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{
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floppy_image_read(floppy, header, pos, 4); pos += 4;
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tag->track_offset[i] = (header[3] << 24) | (header[2] << 16) | (header[1] << 8) | header[0];
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if (LOG) LOG_FORMATS("G64 track %.1f data offset: %04x\n", get_dos_track(i), tag->track_offset[i]);
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tag->track_offset[i] = pick_integer_le(header, pos, 4);
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pos += 4;
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}
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/* speed zone offsets */
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// get speed zone information
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for (i = 0; i < tag->tracks; i++)
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{
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floppy_image_read(floppy, header, pos, 4); pos += 4;
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tag->speed_zone_offset[i] = (header[3] << 24) | (header[2] << 16) | (header[1] << 8) | header[0];
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tag->speed_zone_offset[i] = pick_integer_le(header, pos, 4);
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pos += 4;
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if (LOG)
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tag->track_size[i] = g64_get_track_size(floppy, 0, i);
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if (tag->track_offset[i] > 0)
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{
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LOG_FORMATS("G64 track %.1f offset %05x length %04x ", get_dos_track(i), tag->track_offset[i], tag->track_size[i]);
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if (tag->speed_zone_offset[i] < 4) {
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LOG_FORMATS("G64 track %.1f speed zone: %u\n", get_dos_track(i), tag->speed_zone_offset[i]);
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LOG_FORMATS("speed %u\n", tag->speed_zone_offset[i]);
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} else {
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LOG_FORMATS("G64 track %.1f speed zone offset: %04x\n", get_dos_track(i), tag->speed_zone_offset[i]);
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LOG_FORMATS("speed offset %04x\n", tag->speed_zone_offset[i]);
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}
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}
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}
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/* set callbacks */
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// set callbacks
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callbacks = floppy_callbacks(floppy);
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callbacks->read_track = g64_read_track;
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@ -15,9 +15,10 @@
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MACROS / CONSTANTS
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***************************************************************************/
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#define G64_SYNC_MARK 0x3ff /* 10 consecutive 1-bits */
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#define G64_SYNC_MARK 0x3ff /* 10 consecutive 1-bits */
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#define G64_BUFFER_SIZE 16384
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#define G64_BUFFER_SIZE 16384
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#define G64_SPEED_BLOCK_SIZE 1982
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const int C2040_BITRATE[] =
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{
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