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Main_MiSTer/support/c64/c64.cpp
sorgelig 15da29e4fa C64: enable G64 write.
2021-06-16 23:05:45 +08:00

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <algorithm>
#include <vector>
#include "../../file_io.h"
#include "../../user_io.h"
#include "../../hardware.h"
//#define dbgprintf printf
#define dbgprintf(...)
#define CBM_PRG 0x82
#define T64_BYTE_PER_HEADER 32U
#define T64_FILL_VALUE 0x20
#define D64_FILE_STRIDE 10U
#define D64_DIR_STRIDE 3U
#define D64_TRACK_PER_DISK 35U
#define D64_SECTOR_PER_DISK 683U
#define D64_FILE_SECTOR_PER_DISK (D64_SECTOR_PER_DISK - 19U)
#define D64_BYTE_PER_DIR 32U
#define D64_BYTE_PER_SECTOR 256U
#define D64_BYTE_PER_FILE_SECTOR 254U
#define D64_DIR_PER_SECTOR 8U
#define D64_FILE_PER_DISK 144U
#define D64_BYTE_PER_BAM_ENTRY 4U
#define D64_BYTE_PER_STRING 16U
#define D64_BAM_TRACK 18U
#define D64_BAM_SECTOR 0U
#define D64_DIR_TRACK 18U
#define D64_DIR_SECTOR 1U
#define D64_FILE_TRACK 1U // 1-35
#define D64_FILE_SECTOR 0U
#define D64_FILL_VALUE 0xA0
#define D64_INIT_VALUE 0x00 // DIR relies on 0x00 initial value
struct FileRecord {
char name[D64_BYTE_PER_STRING];
unsigned char cbm;
unsigned short start;
unsigned short size;
unsigned offset;
unsigned index;
};
static bool cmp_offset(const FileRecord& a, const FileRecord& b) { return a.offset < b.offset; }
static bool cmp_index(const FileRecord& a, const FileRecord& b) { return a.index < b.index; }
static unsigned char d64_sector_per_track(unsigned char trackNum) {
return (trackNum <= 17) ? 21U
: (trackNum <= 24) ? 19U
: (trackNum <= 30) ? 18U
: 17U;
}
static unsigned d64_file_sector(unsigned size) {
return (size + D64_BYTE_PER_FILE_SECTOR - 1) / D64_BYTE_PER_FILE_SECTOR;
}
static unsigned d64_offset(unsigned char trackNum, unsigned char sectorNum)
{
static unsigned TrackFileOffset[D64_TRACK_PER_DISK] = {
0x00000, /* 1 */ 0x01500, /* 2 */ 0x02A00, /* 3 */ 0x03F00, /* 4 */ 0x05400, /* 5 */
0x06900, /* 6 */ 0x07E00, /* 7 */ 0x09300, /* 8 */ 0x0A800, /* 9 */ 0x0BD00, /* 10 */
0x0D200, /* 11 */ 0x0E700, /* 12 */ 0x0FC00, /* 13 */ 0x11100, /* 14 */ 0x12600, /* 15 */
0x13B00, /* 16 */ 0x15000, /* 17 */ 0x16500, /* 18 */ 0x17800, /* 19 */ 0x18B00, /* 20 */
0x19E00, /* 21 */ 0x1B100, /* 22 */ 0x1C400, /* 23 */ 0x1D700, /* 24 */ 0x1EA00, /* 25 */
0x1FC00, /* 26 */ 0x20E00, /* 27 */ 0x22000, /* 28 */ 0x23200, /* 29 */ 0x24400, /* 30 */
0x25600, /* 31 */ 0x26700, /* 32 */ 0x27800, /* 33 */ 0x28900, /* 34 */ 0x29A00, /* 35 */
};
return TrackFileOffset[trackNum - 1] + sectorNum * D64_BYTE_PER_SECTOR;
}
static void d64_advance_pointer(unsigned char& trackNum, unsigned char& sectorNum) {
unsigned stride = trackNum == D64_DIR_TRACK ? D64_DIR_STRIDE : D64_FILE_STRIDE;
unsigned sectorPerTrack = d64_sector_per_track(trackNum);
sectorNum = (sectorNum + stride) % sectorPerTrack;
// 18 sectors with a stride of 10 has a common divisor of 2. NOTE: this doesn't handle all combinations of sectorsPerTrack and stride
if (!(sectorPerTrack & 1) && !(stride & 1) && !(sectorNum >> 1)) sectorNum ^= 1;
// caller needs to handle DIR track
if (!sectorNum) trackNum = trackNum % D64_TRACK_PER_DISK + 1;
}
static void d64_advance_dir_pointer(unsigned char& trackNum, unsigned char& sectorNum) {
unsigned stride = trackNum == D64_DIR_TRACK ? D64_DIR_STRIDE : D64_FILE_STRIDE;
unsigned sectorPerTrack = d64_sector_per_track(trackNum);
// don't leave current track
sectorNum = (sectorNum + stride) % sectorPerTrack;
// caller needs to handle BAM sector
}
static int c64_convert_t64_to_d64(fileTYPE* f_in, fileTYPE* f_out)
{
std::vector<FileRecord> files;
char header[T64_BYTE_PER_HEADER];
char name[D64_BYTE_PER_STRING];
if (!FileSeek(f_in, 0, SEEK_SET)) return 0;
// ignore signature
if(!FileReadAdv(f_in, header, sizeof(header))) return 0;
if (memcmp(header, "C64", strlen("C64"))) return 0;
// header
if (!FileReadAdv(f_in, header, sizeof(header))) return 0;
unsigned short numRecords = (header[0x03] << 8) | header[0x02];
memcpy(name, header + 0x08, sizeof(name));
for (unsigned i = 0; i < numRecords; i++)
{
// record
if (!FileReadAdv(f_in, header, sizeof(header))) return 0;
if (!header[0x00] || !header[0x01]) continue;
FileRecord r;
r.cbm = CBM_PRG; // header[0x01];
r.start = (header[0x03] << 8) | header[0x02];
r.size = ((header[0x05] << 8) | header[0x04]) - r.start;
r.offset = (header[0x0B] << 24) | (header[0x0A] << 16) | (header[0x09] << 8) | header[0x08];
memcpy(r.name, header + 0x10, sizeof(r.name));
r.index = i;
files.push_back(r);
}
// workaround incorrect end/limit address
std::sort(files.begin(), files.end(), cmp_offset);
for (unsigned i = 0; i < files.size(); i++)
{
unsigned short size = (i < files.size() - 1 ? files[i + 1].offset : f_in->size) - files[i].offset;
if (size < files[i].size) files[i].size = size;
}
std::sort(files.begin(), files.end(), cmp_index);
// account for start address in PRG format
for (unsigned i = 0; i < files.size(); i++) files[i].size += 2;
// drop files until they fit
if (files.size() > D64_FILE_PER_DISK) files.resize(D64_FILE_PER_DISK);
for (unsigned i = 0, fileSectors = 0; i < files.size(); i++)
{
fileSectors += d64_file_sector(files[i].size);
if (fileSectors > D64_FILE_SECTOR_PER_DISK)
{
files.resize(i);
break;
}
}
//printf("T64: %d records\n", files.size()); for (auto r : files) printf("start: %x, size: %x, offset %x, index: %d\n", r.start, r.size, r.offset, r.index);
if (!files.size()) return 0;
unsigned char sector[D64_BYTE_PER_SECTOR];
memset(sector, D64_INIT_VALUE, sizeof(sector));
for (unsigned i = 0; i < D64_SECTOR_PER_DISK; i++) if (!FileWriteAdv(f_out, sector, sizeof(sector))) return 0;
if (!FileSeek(f_out, 0, SEEK_SET)) return 0;
unsigned char bam[D64_BYTE_PER_SECTOR];
memset(bam, D64_INIT_VALUE, sizeof(bam));
unsigned char dir[D64_BYTE_PER_DIR];
unsigned char fileTrackNum = D64_FILE_TRACK, fileSectorNum = D64_FILE_SECTOR, dirTrackNum = D64_DIR_TRACK, dirSectorNum = D64_DIR_SECTOR, dirEntry = 0;
for (unsigned i = 0; i < files.size(); i++) {
FileRecord& r = files[i];
// DIR sector
if (dirEntry == 0 && i != 0)
{
// set next track/sector pointer of prev node
if (!FileSeek(f_out, d64_offset(dirTrackNum, dirSectorNum), SEEK_SET)) return 0;
do d64_advance_dir_pointer(dirTrackNum, dirSectorNum); while (dirTrackNum == D64_BAM_TRACK && dirSectorNum == D64_BAM_SECTOR);
dir[0x00] = dirTrackNum;
dir[0x01] = dirSectorNum;
if (!FileWriteAdv(f_out, dir, 2)) return 0;
// check for overflow
bool success = dirSectorNum != D64_DIR_SECTOR;
if (!success) printf("T64: dir overflow on file: %d\n", i);
if (!success) return 0;
}
if (!FileSeek(f_out, d64_offset(dirTrackNum, dirSectorNum) + dirEntry * D64_BYTE_PER_DIR, SEEK_SET)) return 0;
dir[0x00] = 0x00;
dir[0x01] = dirEntry == 0 ? 0xFF : 0x00;
dir[0x02] = r.cbm;
dir[0x03] = fileTrackNum;
dir[0x04] = fileSectorNum;
memcpy(dir + 0x05, r.name, sizeof(r.name));
for (int o = sizeof(r.name) - 1; o >= 0; o--) if (dir[0x05 + o] != T64_FILL_VALUE) break; else dir[0x05 + o] = D64_FILL_VALUE;
memset(dir + 0x15, 0x00, 0x17 - 0x15 + 1); // REL
memset(dir + 0x18, 0x00, 0x1D - 0x18 + 1);
unsigned sectorSize= d64_file_sector(files[i].size);
dir[0x1E] = (sectorSize >> 0) & 0xFF;
dir[0x1F] = (sectorSize >> 8) & 0xFF;
if (!FileWriteAdv(f_out, dir, sizeof(dir))) return 0;
dirEntry = (dirEntry + 1) % D64_DIR_PER_SECTOR;
// file sectors
if (!FileSeek(f_in, r.offset, SEEK_SET)) return 0;
bool writeAddress = true;
for (unsigned s = 0; s < r.size; s+= D64_BYTE_PER_FILE_SECTOR)
{
if (!FileSeek(f_out, d64_offset(fileTrackNum, fileSectorNum), SEEK_SET)) return 0;
d64_advance_pointer(fileTrackNum, fileSectorNum);
if (fileTrackNum == D64_DIR_TRACK) fileTrackNum += 1;
memset(sector, D64_FILL_VALUE, sizeof(sector));
unsigned cnt = std::min(D64_BYTE_PER_FILE_SECTOR, r.size - s);
sector[0x00] = (s + D64_BYTE_PER_FILE_SECTOR < r.size) ? fileTrackNum : 0x00;
sector[0x01] = (s + D64_BYTE_PER_FILE_SECTOR < r.size) ? fileSectorNum : (cnt + 2 - 1);
if (writeAddress)
{
sector[0x02] = (r.start >> 0) & 0xFF;
sector[0x03] = (r.start >> 8) & 0xFF;
}
if (!FileReadAdv(f_in, sector + (writeAddress ? 4 : 2), cnt - (writeAddress ? 2 : 0))) return 0;
if (!FileWriteAdv(f_out, sector, sizeof(sector))) return 0;
writeAddress = false;
}
}
// BAM
bam[0x00] = D64_DIR_TRACK;
bam[0x01] = D64_DIR_SECTOR;
bam[0x02] = 0x41;
bam[0x03] = 0x00;
// set available
while (true) {
d64_advance_pointer(fileTrackNum, fileSectorNum);
if (fileTrackNum == D64_FILE_TRACK && fileSectorNum == D64_FILE_SECTOR) break;
if (fileTrackNum == D64_DIR_TRACK) continue;
bam[0x04 + (fileTrackNum - 1) * D64_BYTE_PER_BAM_ENTRY] += 1;
bam[0x04 + (fileTrackNum - 1) * D64_BYTE_PER_BAM_ENTRY + 1 + fileSectorNum / 8] |= 1 << (fileSectorNum % 8);
};
while (true) {
d64_advance_dir_pointer(dirTrackNum, dirSectorNum);
if (dirTrackNum == D64_DIR_TRACK && dirSectorNum == D64_DIR_SECTOR) break;
if (dirTrackNum == D64_BAM_TRACK && dirSectorNum == D64_BAM_SECTOR) continue;
bam[0x04 + (dirTrackNum - 1) * D64_BYTE_PER_BAM_ENTRY] += 1;
bam[0x04 + (dirTrackNum - 1) * D64_BYTE_PER_BAM_ENTRY + 1 + dirSectorNum / 8] |= 1 << (dirSectorNum % 8);
}
memcpy(bam + 0x90, name, sizeof(name));
for (int o = sizeof(name) - 1; o >= 0; o--) if (bam[0x90 + o] != T64_FILL_VALUE) break; else bam[0x90 + o] = D64_FILL_VALUE;
bam[0xA0] = D64_FILL_VALUE;
bam[0xA1] = D64_FILL_VALUE;
bam[0xA2] = 0x30;
bam[0xA3] = 0x30;
bam[0xA4] = D64_FILL_VALUE;
bam[0xA5] = 0x32;
bam[0xA6] = 0x41;
memset(bam + 0xA7, D64_FILL_VALUE, 0xAA - 0xA7 + 1);
memset(bam + 0xAB, 0x00, 0xFF - 0xAB + 1);
if (!FileSeek(f_out, d64_offset(D64_BAM_TRACK, D64_BAM_SECTOR), SEEK_SET)) return 0;
if (!FileWriteAdv(f_out, bam, sizeof(bam))) return 0;
f_out->size = FileGetSize(f_out);
printf("Virtual D64 size = %llu\n", f_out->size);
return 1;
}
int c64_openT64(const char *path, fileTYPE* f)
{
if (!FileOpenEx(f, "vdsk", -1))
{
printf("ERROR: fail to create vdsk\n");
return 0;
}
fileTYPE f_in;
if (!FileOpen(&f_in, path))
{
FileClose(f);
return 0;
}
int ret = c64_convert_t64_to_d64(&f_in, f);
FileClose(&f_in);
if (!ret)
{
printf("Failed to convert T64 (%s).\n", path);
FileClose(f);
}
return ret;
}
// -----------------------------------------------------------------------------------------
struct img_info
{
fileTYPE *f;
int type;
uint8_t id[2];
int32_t trk_sz;
uint32_t trk_map[84];
};
static img_info gcr_info[16] = {};
int c64_openGCR(const char *path, fileTYPE *f, int idx)
{
gcr_info[idx].f = f;
if (!strcasecmp(path + strlen(path) - 4, ".g64"))
{
char str[16];
FileReadAdv(f, str, 12);
if (memcmp(str, "GCR-1541", 8))
{
printf("Not a G64 format!\n");
return 0;
}
else
{
gcr_info[idx].type = 2;
memset(gcr_info[idx].trk_map, 0, sizeof(gcr_info[idx].trk_map));
FileReadAdv(f, gcr_info[idx].trk_map, 84 * 4);
}
}
else
{
gcr_info[idx].type = 1;
FileSeek(f, 0x165a2, SEEK_SET);
gcr_info[idx].id[0] = 0;
gcr_info[idx].id[1] = 0;
FileReadAdv(f, gcr_info[idx].id, 2);
printf("D64 disk id1=%02X, id2=%02X\n", gcr_info[idx].id[0], gcr_info[idx].id[1]);
}
return 1;
}
void c64_closeGCR(int idx)
{
gcr_info[idx].type = 0;
}
static uint8_t trk_buf[8192];
static uint8_t gcr_buf[8192*2];
static int start_sectors[41] = {
0, 21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, 294, 315, 336, 357, 376, 395,
414, 433, 452, 471, 490, 508, 526, 544, 562, 580, 598, 615, 632, 649, 666, 683, 700, 717, 734, 751,
768
};
static const uint8_t gcr_lut[16] = {
0x0a, 0x0b, 0x12, 0x13,
0x0e, 0x0f, 0x16, 0x17,
0x09, 0x19, 0x1a, 0x1b,
0x0d, 0x1d, 0x1e, 0x15
};
static const uint8_t bin_lut[32] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 8, 0, 1, 0, 12, 4, 5,
0, 0, 2, 3, 0, 15, 6, 7,
0, 9, 10, 11, 0, 13, 14, 0
};
static uint8_t *gcrptr;
static int gcrcnt = 0;
void bin2gcr(uint8_t bin)
{
static uint64_t gcr = 0;
gcr <<= 5;
gcr |= gcr_lut[(bin >> 4) & 0xF];
gcr <<= 5;
gcr |= gcr_lut[bin & 0xF];
gcrcnt++;
if (gcrcnt == 4)
{
gcrcnt = 0;
*gcrptr++ = (uint8_t)(gcr >> 32);
*gcrptr++ = (uint8_t)(gcr >> 24);
*gcrptr++ = (uint8_t)(gcr >> 16);
*gcrptr++ = (uint8_t)(gcr >> 8);
*gcrptr++ = (uint8_t)(gcr);
}
}
void gcr2bin(uint8_t *gcr, uint8_t *bin)
{
// from VICE
register uint32_t tmp = *gcr;
tmp <<= 13;
for (int i = 5; i < 13; i += 2, bin++)
{
gcr++;
tmp |= ((uint32_t)(*gcr)) << i;
*bin = bin_lut[(tmp >> 16) & 0x1f] << 4;
tmp <<= 5;
*bin |= bin_lut[(tmp >> 16) & 0x1f];
tmp <<= 5;
}
}
void c64_readGCR(int idx, uint8_t track)
{
if (!gcr_info[idx].type) return;
if (gcr_info[idx].type == 2)
{
if (!gcr_info[idx].trk_map[track])
{
gcr_info[idx].trk_sz = 4096;
memset(gcr_buf, 0, gcr_info[idx].trk_sz);
dbgprintf("Track %d%s: no data\n", track >> 1, (track & 1) ? ".5" : "");
}
else
{
FileSeek(gcr_info[idx].f, gcr_info[idx].trk_map[track], SEEK_SET);
FileReadAdv(gcr_info[idx].f, gcr_buf, 8192);
gcr_info[idx].trk_sz = (gcr_buf[1] << 8) | gcr_buf[0];
dbgprintf("Track %d%s: size %d\n", (track >> 1) + 1, (track & 1) ? ".5" : "", gcr_info[idx].trk_sz);
gcr_info[idx].trk_sz += 2;
}
}
else if (track & 1)
{
track >>= 1;
gcr_info[idx].trk_sz = (start_sectors[track + 1] - start_sectors[track]) * 256;
memset(gcr_buf, 0, gcr_info[idx].trk_sz);
track++;
dbgprintf("\nBetween tracks %d <|> %d.\n", track, track+1);
}
else
{
track >>= 1;
int size = (start_sectors[track + 1] - start_sectors[track]) * 256;
FileSeek(gcr_info[idx].f, start_sectors[track] * 256, SEEK_SET);
FileReadAdv(gcr_info[idx].f, trk_buf, size);
track++;
uint8_t sec = 0;
gcrptr = gcr_buf + 2;
for (int ptr = 0; ptr < size; ptr += 256)
{
gcrcnt = 0;
*gcrptr++ = 0xFF; *gcrptr++ = 0xFF; *gcrptr++ = 0xFF; *gcrptr++ = 0xFF; *gcrptr++ = 0xFF;
bin2gcr(0x08);
bin2gcr(sec ^ track ^ gcr_info[idx].id[0] ^ gcr_info[idx].id[1]);
bin2gcr(sec);
bin2gcr(track);
bin2gcr(gcr_info[idx].id[1]);
bin2gcr(gcr_info[idx].id[0]);
bin2gcr(0x0F);
bin2gcr(0x0F);
*gcrptr++ = 0x55; *gcrptr++ = 0x55; *gcrptr++ = 0x55; *gcrptr++ = 0x55; *gcrptr++ = 0x55;
*gcrptr++ = 0x55; *gcrptr++ = 0x55; *gcrptr++ = 0x55; *gcrptr++ = 0x55;
uint8_t cs = 0;
uint8_t bt;
*gcrptr++ = 0xFF; *gcrptr++ = 0xFF; *gcrptr++ = 0xFF; *gcrptr++ = 0xFF; *gcrptr++ = 0xFF;
bin2gcr(0x07);
for (int i = 0; i < 256; i++)
{
bt = trk_buf[ptr + i];
cs ^= bt;
bin2gcr(bt);
}
bin2gcr(cs);
bin2gcr(0);
bin2gcr(0);
int gap = (track < 18) ? 8 : (track < 25) ? 17 : (track < 31) ? 12 : 9;
while (gap--) *gcrptr++ = 0x55;
sec++;
}
gcr_info[idx].trk_sz = gcrptr - gcr_buf;
dbgprintf("Read GCR track %d: bin_size = %d, gcr_size = %d\n", track, size, gcr_info[idx].trk_sz);
}
uint16_t sz = gcr_info[idx].trk_sz - 1;
gcr_buf[0] = (uint8_t)sz;
gcr_buf[1] = (uint8_t)(sz >> 8);
EnableIO();
spi_w(UIO_SECTOR_RD | (idx << 8));
spi_block_write(gcr_buf, user_io_get_width(), gcr_info[idx].trk_sz);
DisableIO();
}
static uint8_t* align(uint8_t* src, int size)
{
static uint8_t buf[512];
memcpy(buf, src, size);
int rol = 0;
while (buf[0] & 0x80)
{
rol++;
uint8_t c = 0, t;
for (int i = size - 1; i >= 0; i--)
{
t = buf[i] & 0x80;
buf[i] = (buf[i] << 1) | c;
c = t ? 1 : 0;
}
}
if (rol)
{
dbgprintf("** ROL = %d ** ", rol);
}
return buf;
}
void c64_writeGCR(int idx, uint8_t track)
{
if (!gcr_info[idx].type) return;
static uint8_t sec_buf[260];
EnableIO();
spi_w(UIO_SECTOR_WR | (idx << 8));
spi_block_read(gcr_buf, user_io_get_width(), 8192);
DisableIO();
if (gcr_info[idx].type == 2)
{
if (gcr_info[idx].trk_map[track])
{
FileSeek(gcr_info[idx].f, gcr_info[idx].trk_map[track]+2, SEEK_SET);
FileWriteAdv(gcr_info[idx].f, gcr_buf + 2, gcr_info[idx].trk_sz - 2);
dbgprintf("Write Track %d%s: size %d\n", (track >> 1) + 1, (track & 1) ? ".5" : "", gcr_info[idx].trk_sz - 2);
}
return;
}
if (track & 1)
{
dbgprintf("Discard data between tracks!\n");
return;
}
track >>= 1;
dbgprintf("\n\nTrack = %d\n", track + 1);
//hexdump(gcr_buf, 8192);
int sec_cnt = start_sectors[track + 1] - start_sectors[track];
int sync = 0;
uint8_t prev = 0, started = 0;
int off = 0, ptr = 2;
uint8_t sec = 0xFF;
memcpy(gcr_buf + gcr_info[idx].trk_sz, gcr_buf + 2, gcr_info[idx].trk_sz - 2);
memset(trk_buf, 0, sizeof(trk_buf));
while(ptr < gcr_info[idx].trk_sz)
{
if (prev == 0xFF && gcr_buf[ptr + off] == 0xFF)
{
sync = 1;
}
if (gcr_buf[ptr + off] != 0xFF && sync)
{
uint8_t *hdr = align(gcr_buf + ptr + off, 11);
uint32_t bin;
gcr2bin(hdr, (uint8_t*)&bin);
if (!started && (bin & 0xFF) == 8)
{
off = ptr - 2;
ptr = 2;
started = 1;
dbgprintf("Start at %d\n\n", off);
}
dbgprintf("Sync = %08X: ", bin);
if ((bin & 0xFF) == 8)
{
sec = (uint8_t)(bin >> 16);
gcr2bin(hdr + 5, (uint8_t*)&bin);
gcr_info[idx].id[1] = (uint8_t)(bin);
gcr_info[idx].id[0] = (uint8_t)(bin >> 8);
dbgprintf("sec = %d, id1 = %02X, id2 = %02X\n", sec, gcr_info[idx].id[0], gcr_info[idx].id[1]);
}
else if ((bin & 0xFF) == 7)
{
if (sec < sec_cnt)
{
dbgprintf("data...\n\n");
uint8_t *data = align(gcr_buf + ptr + off, 330);
int dst = 0;
int src = 0;
for (; dst < 260; src += 5, dst += 4)
{
gcr2bin(data + src, sec_buf + dst);
}
memcpy(trk_buf + (sec * 256), sec_buf + 1, 256);
/*
printf("Sec data:\n");
hexdump(trk_buf + (sec * 256), 256);
printf("\n");
*/
}
else
{
dbgprintf("nothing here.\n\n");
sec = 0xFF;
}
ptr += 256; // a little before the end
}
else
{
/*
printf("\noff %X\n", ptr + off - 20);
hexdump(gcr_buf + ptr + off - 20, 256);
*/
}
sync = 0;
}
else
{
prev = gcr_buf[ptr + off];
ptr++;
}
}
FileSeek(gcr_info[idx].f, start_sectors[track] * 256, SEEK_SET);
FileWriteAdv(gcr_info[idx].f, trk_buf, sec_cnt * 256);
}
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